refactor CopyPass

.gitmodules

@@ -4,12 +4,12 @@
 [submodule "lib/FAudio"]
 	path = lib/FAudio
 	url = https://github.com/FNA-XNA/FAudio.git
-[submodule "lib/RefreshCS"]
-	path = lib/RefreshCS
-	url = https://gitea.moonside.games/MoonsideGames/RefreshCS.git
 [submodule "lib/WellspringCS"]
 	path = lib/WellspringCS
 	url = https://gitea.moonside.games/MoonsideGames/WellspringCS.git
 [submodule "lib/dav1dfile"]
 	path = lib/dav1dfile
 	url = https://github.com/MoonsideGames/dav1dfile.git
+[submodule "SDL2_gpuCS"]
+	path = lib/SDL2_gpuCS
+	url = https://github.com/MoonsideGames/SDL2_gpuCS.git

MoonWorks.csproj

@@ -3,7 +3,6 @@
 	<PropertyGroup>
 		<TargetFramework>net8.0</TargetFramework>
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-		<LangVersion>11</LangVersion>
 	</PropertyGroup>
 
 	<PropertyGroup>
@@ -12,7 +11,7 @@
 
 	<ItemGroup>
 		<Compile Include="lib\FAudio\csharp\FAudio.cs" />
-		<Compile Include="lib\RefreshCS\src\Refresh.cs" />
+		<Compile Include="lib\SDL2_gpuCS\SDL2_gpuCS.cs" />
 		<Compile Include="lib\SDL2-CS\src\SDL2.cs" />
 		<Compile Include="lib\WellspringCS\WellspringCS.cs" />
 		<Compile Include="lib\dav1dfile\csharp\dav1dfile.cs" />
@@ -26,8 +25,8 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\video_fullscreen.vert.refresh">
+		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\fullscreen.vert.refresh">
-			<LogicalName>MoonWorks.Graphics.StockShaders.VideoFullscreen.vert.refresh</LogicalName>
+			<LogicalName>MoonWorks.Graphics.StockShaders.Fullscreen.vert.refresh</LogicalName>
 		</EmbeddedResource>
 		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\video_yuv2rgba.frag.refresh">
 			<LogicalName>MoonWorks.Graphics.StockShaders.VideoYUV2RGBA.frag.refresh</LogicalName>
@@ -38,5 +37,8 @@
 		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\text_msdf.frag.refresh">
 			<LogicalName>MoonWorks.Graphics.StockShaders.TextMSDF.frag.refresh</LogicalName>
 		</EmbeddedResource>
+		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\blit.frag.refresh">
+			<LogicalName>MoonWorks.Graphics.StockShaders.Blit.frag.refresh</LogicalName>
+		</EmbeddedResource>
 	</ItemGroup>
 </Project>

MoonWorks.dll.config

@@ -5,8 +5,8 @@
 	<dllmap dll="SDL2" os="linux,freebsd,netbsd" target="libSDL2-2.0.so.0"/>
 
 	<dllmap dll="Refresh" os="windows" target="Refresh.dll"/>
-	<dllmap dll="Refresh" os="osx" target="libRefresh.1.dylib"/>
+	<dllmap dll="Refresh" os="osx" target="libRefresh.2.dylib"/>
-	<dllmap dll="Refresh" os="linux,freebsd,netbsd" target="libRefresh.so.1"/>
+	<dllmap dll="Refresh" os="linux,freebsd,netbsd" target="libRefresh.so.2"/>
 
 	<dllmap dll="FAudio" os="windows" target="FAudio.dll"/>
 	<dllmap dll="FAudio" os="osx" target="libFAudio.0.dylib"/>

lib/RefreshCS

@@ -1 +0,0 @@
-Subproject commit b5325e6d0329eeb35b074091a569a5f679852d28

lib/SDL2_gpuCS

@@ -0,0 +1 @@
+Subproject commit 70925aa394c0f24388f3cfb97f1c6ee1f91baf52

src/Conversions.cs

@@ -21,7 +21,7 @@ namespace MoonWorks
 			{ VertexElementFormat.NormalizedShort4, (uint) Marshal.SizeOf<NormalizedShort4>() },
 			{ VertexElementFormat.Short2, (uint) Marshal.SizeOf<Short2>() },
 			{ VertexElementFormat.Short4, (uint) Marshal.SizeOf<Short4>() },
-			{ VertexElementFormat.UInt, (uint) Marshal.SizeOf<uint>() },
+			{ VertexElementFormat.Uint, (uint) Marshal.SizeOf<uint>() },
 			{ VertexElementFormat.Vector2, (uint) Marshal.SizeOf<Math.Float.Vector2>() },
 			{ VertexElementFormat.Vector3, (uint) Marshal.SizeOf<Math.Float.Vector3>() },
 			{ VertexElementFormat.Vector4, (uint) Marshal.SizeOf<Math.Float.Vector4>() }
@@ -37,6 +37,16 @@ namespace MoonWorks
 			return b != 0;
 		}
 
+		public static int BoolToInt(bool b)
+		{
+			return b ? 1 : 0;
+		}
+
+		public static bool IntToBool(int b)
+		{
+			return b != 0;
+		}
+
 		public static uint VertexElementFormatSize(VertexElementFormat format)
 		{
 			return Sizes[format];

src/Game.cs

@@ -48,15 +48,16 @@ namespace MoonWorks
 		/// </summary>
 		/// <param name="windowCreateInfo">The parameters that will be used to create the MainWindow.</param>
 		/// <param name="frameLimiterSettings">The frame limiter settings.</param>
+		/// <param name="preferredBackends">Bitflags of which GPU backends to attempt to initialize.</param>
 		/// <param name="targetTimestep">How often Game.Update will run in terms of ticks per second.</param>
 		/// <param name="debugMode">If true, enables extra debug checks. Should be turned off for release builds.</param>
 		public Game(
 			WindowCreateInfo windowCreateInfo,
 			FrameLimiterSettings frameLimiterSettings,
+			BackendFlags preferredBackends,
 			int targetTimestep = 60,
 			bool debugMode = false
-		)
+		) {
-		{
 			Logger.LogInfo("Initializing frame limiter...");
 			Timestep = TimeSpan.FromTicks(TimeSpan.TicksPerSecond / targetTimestep);
 			gameTimer = Stopwatch.StartNew();
@@ -75,21 +76,19 @@ namespace MoonWorks
 				return;
 			}
 
-			Logger.Initialize();
-
 			Logger.LogInfo("Initializing input...");
 			Inputs = new Inputs();
 
 			Logger.LogInfo("Initializing graphics device...");
 			GraphicsDevice = new GraphicsDevice(
-				Backend.Vulkan,
+				preferredBackends,
 				debugMode
 			);
 
 			Logger.LogInfo("Initializing main window...");
 			MainWindow = new Window(windowCreateInfo, GraphicsDevice.WindowFlags | SDL.SDL_WindowFlags.SDL_WINDOW_HIDDEN);
 
-			if (!GraphicsDevice.ClaimWindow(MainWindow, windowCreateInfo.PresentMode))
+			if (!GraphicsDevice.ClaimWindow(MainWindow, windowCreateInfo.SwapchainComposition, windowCreateInfo.PresentMode))
 			{
 				throw new System.SystemException("Could not claim window!");
 			}

src/Graphics/Bindings/BufferBinding.cs

@@ -1,17 +0,0 @@
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// A buffer-offset pair to be used when binding vertex buffers.
-	/// </summary>
-	public struct BufferBinding
-	{
-		public Buffer Buffer;
-		public ulong Offset;
-
-		public BufferBinding(Buffer buffer, ulong offset)
-		{
-			Buffer = buffer;
-			Offset = offset;
-		}
-	}
-}

src/Graphics/Bindings/TextureSamplerBinding.cs

@@ -1,17 +0,0 @@
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// A texture-sampler pair to be used when binding samplers.
-	/// </summary>
-	public struct TextureSamplerBinding
-	{
-		public Texture Texture;
-		public Sampler Sampler;
-
-		public TextureSamplerBinding(Texture texture, Sampler sampler)
-		{
-			Texture = texture;
-			Sampler = sampler;
-		}
-	}
-}

src/Graphics/ComputePass.cs

@@ -0,0 +1,213 @@
+using System.Runtime.InteropServices;
+using SDL2;
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics;
+
+public class ComputePass
+{
+	public nint Handle { get; private set; }
+
+	internal void SetHandle(nint handle)
+	{
+		Handle = handle;
+	}
+
+#if DEBUG
+	internal bool active;
+
+	ComputePipeline currentComputePipeline;
+#endif
+
+	/// <summary>
+	/// Binds a compute pipeline so that compute work may be dispatched.
+	/// </summary>
+	/// <param name="computePipeline">The compute pipeline to bind.</param>
+	public void BindComputePipeline(
+		ComputePipeline computePipeline
+	) {
+#if DEBUG
+		AssertComputePassActive();
+
+		// TODO: validate formats?
+#endif
+
+		SDL_Gpu.SDL_GpuBindComputePipeline(
+			Handle,
+			computePipeline.Handle
+		);
+
+#if DEBUG
+		currentComputePipeline = computePipeline;
+#endif
+	}
+
+	/// <summary>
+	/// Binds a texture to be used in the compute shader.
+	/// This texture must have been created with the ComputeShaderRead usage flag.
+	/// </summary>
+	public unsafe void BindStorageTexture(
+		in TextureSlice textureSlice,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertComputePassActive();
+		AssertComputePipelineBound();
+		AssertTextureNonNull(textureSlice.Texture);
+		AssertTextureHasComputeStorageReadFlag(textureSlice.Texture);
+#endif
+
+		var sdlTextureSlice = textureSlice.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindComputeStorageTextures(
+			Handle,
+			slot,
+			&sdlTextureSlice,
+			1
+		);
+	}
+
+	/// <summary>
+	/// Binds a buffer to be used in the compute shader.
+	/// This buffer must have been created with the ComputeShaderRead usage flag.
+	/// </summary>
+	public unsafe void BindStorageBuffer(
+		GpuBuffer buffer,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertComputePassActive();
+		AssertComputePipelineBound();
+		AssertBufferNonNull(buffer);
+		AssertBufferHasComputeStorageReadFlag(buffer);
+#endif
+
+		var bufferHandle = buffer.Handle;
+
+		SDL_Gpu.SDL_GpuBindComputeStorageBuffers(
+			Handle,
+			slot,
+			&bufferHandle,
+			1
+		);
+	}
+
+	/// <summary>
+	/// Pushes compute shader uniform data.
+	/// Subsequent draw calls will use this uniform data.
+	/// </summary>
+	public unsafe void PushUniformData(
+		void* uniformsPtr,
+		uint size,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertComputePassActive();
+		AssertComputePipelineBound();
+
+		if (slot >= currentComputePipeline.ResourceInfo.UniformBufferCount)
+		{
+			throw new System.ArgumentException($"Slot {slot} given, but {currentComputePipeline.ResourceInfo.UniformBufferCount} uniform buffers are used on the shader!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuPushComputeUniformData(
+			Handle,
+			slot,
+			(nint) uniformsPtr,
+			size
+		);
+	}
+
+	/// <summary>
+	/// Pushes compute shader uniform data.
+	/// Subsequent draw calls will use this uniform data.
+	/// </summary>
+	public unsafe void PushUniformData<T>(
+		in T uniforms,
+		uint slot = 0
+	) where T : unmanaged
+	{
+		fixed (T* uniformsPtr = &uniforms)
+		{
+			PushUniformData(uniformsPtr, (uint) Marshal.SizeOf<T>(), slot);
+		}
+	}
+
+
+	/// <summary>
+	/// Dispatches compute work.
+	/// </summary>
+	public void Dispatch(
+		uint groupCountX,
+		uint groupCountY,
+		uint groupCountZ
+	) {
+#if DEBUG
+		AssertComputePassActive();
+		AssertComputePipelineBound();
+
+		if (groupCountX < 1 || groupCountY < 1 || groupCountZ < 1)
+		{
+			throw new System.ArgumentException("All dimensions for the compute work groups must be >= 1!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuDispatchCompute(
+			Handle,
+			groupCountX,
+			groupCountY,
+			groupCountZ
+		);
+	}
+
+#if DEBUG
+	private void AssertComputePassActive(string message = "Render pass is not active!")
+	{
+		if (!active)
+		{
+			throw new System.InvalidOperationException(message);
+		}
+	}
+
+	private void AssertComputePipelineBound(string message = "No compute pipeline is bound!")
+	{
+		if (currentComputePipeline == null)
+		{
+			throw new System.InvalidOperationException(message);
+		}
+	}
+
+	private void AssertTextureNonNull(in TextureSlice textureSlice)
+	{
+		if (textureSlice.Texture == null || textureSlice.Texture.Handle == nint.Zero)
+		{
+			throw new System.NullReferenceException("Texture must not be null!");
+		}
+	}
+
+	private void AssertTextureHasComputeStorageReadFlag(Texture texture)
+	{
+		if ((texture.UsageFlags & TextureUsageFlags.ComputeStorageRead) == 0)
+		{
+			throw new System.ArgumentException("The bound Texture's UsageFlags must include TextureUsageFlags.ComputeStorageRead!");
+		}
+	}
+
+	private void AssertBufferNonNull(GpuBuffer buffer)
+	{
+		if (buffer == null || buffer.Handle == nint.Zero)
+		{
+			throw new System.NullReferenceException("Buffer must not be null!");
+		}
+	}
+
+	private void AssertBufferHasComputeStorageReadFlag(GpuBuffer buffer)
+	{
+		if ((buffer.UsageFlags & BufferUsageFlags.ComputeStorageRead) == 0)
+		{
+			throw new System.ArgumentException("The bound Buffer's UsageFlags must include BufferUsageFlag.ComputeStorageRead!");
+		}
+	}
+#endif
+}

src/Graphics/ComputePassPool.cs

@@ -0,0 +1,25 @@
+using System.Collections.Concurrent;
+
+namespace MoonWorks.Graphics;
+
+internal class ComputePassPool
+{
+	private ConcurrentQueue<ComputePass> ComputePasses = new ConcurrentQueue<ComputePass>();
+
+	public ComputePass Obtain()
+	{
+		if (ComputePasses.TryDequeue(out var computePass))
+		{
+			return computePass;
+		}
+		else
+		{
+			return new ComputePass();
+		}
+	}
+
+	public void Return(ComputePass computePass)
+	{
+		ComputePasses.Enqueue(computePass);
+	}
+}

src/Graphics/CopyPass.cs

@@ -0,0 +1,203 @@
+using System.Runtime.InteropServices;
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics;
+
+public class CopyPass
+{
+	public nint Handle { get; private set; }
+
+	internal void SetHandle(nint handle)
+	{
+		Handle = handle;
+	}
+
+	/// <summary>
+	/// Uploads data from a TransferBuffer to a TextureSlice.
+	/// This copy occurs on the GPU timeline.
+	///
+	/// Overwriting the contents of the TransferBuffer before the command buffer
+	/// has finished execution will cause undefined behavior.
+	///
+	/// You MAY assume that the copy has finished for subsequent commands.
+	/// </summary>
+	/// <param name="cycle">If true, cycles the texture if the given slice is bound.</param>
+	public void UploadToTexture(
+		TransferBuffer transferBuffer,
+		in TextureRegion textureRegion,
+		in BufferImageCopy copyParams,
+		bool cycle
+	) {
+#if DEBUG
+		AssertBufferBoundsCheck(transferBuffer.Size, copyParams.BufferOffset, textureRegion.Size);
+#endif
+
+		SDL_Gpu.SDL_GpuUploadToTexture(
+			Handle,
+			transferBuffer.Handle,
+			textureRegion.ToSDL(),
+			copyParams.ToSDL(),
+			Conversions.BoolToInt(cycle)
+		);
+	}
+
+	/// <summary>
+	/// Uploads the contents of an entire buffer to a 2D texture with no mips.
+	/// </summary>
+	public void UploadToTexture(
+		TransferBuffer transferBuffer,
+		Texture texture,
+		bool cycle
+	) {
+		UploadToTexture(
+			transferBuffer,
+			new TextureRegion(texture),
+			new BufferImageCopy(0, 0, 0),
+			cycle
+		);
+	}
+
+	/// <summary>
+	/// Uploads data from a TransferBuffer to a GpuBuffer.
+	/// This copy occurs on the GPU timeline.
+	///
+	/// Overwriting the contents of the TransferBuffer before the command buffer
+	/// has finished execution will cause undefined behavior.
+	///
+	/// You MAY assume that the copy has finished for subsequent commands.
+	/// </summary>
+	/// <param name="cycle">If true, cycles the buffer if it is bound.</param>
+	public void UploadToBuffer(
+		TransferBuffer transferBuffer,
+		GpuBuffer buffer,
+		in BufferCopy copyParams,
+		bool cycle
+	) {
+#if DEBUG
+		AssertBufferBoundsCheck(transferBuffer.Size, copyParams.SrcOffset, copyParams.Size);
+		AssertBufferBoundsCheck(buffer.Size, copyParams.DstOffset, copyParams.Size);
+#endif
+
+		SDL_Gpu.SDL_GpuUploadToBuffer(
+			Handle,
+			transferBuffer.Handle,
+			buffer.Handle,
+			copyParams.ToSDL(),
+			Conversions.BoolToInt(cycle)
+		);
+	}
+
+	/// <summary>
+	/// Copies the entire contents of a TransferBuffer to a GpuBuffer.
+	/// </summary>
+	public void UploadToBuffer(
+		TransferBuffer transferBuffer,
+		GpuBuffer buffer,
+		bool cycle
+	) {
+		UploadToBuffer(
+			transferBuffer,
+			buffer,
+			new BufferCopy(0, 0, transferBuffer.Size),
+			cycle
+		);
+	}
+
+	/// <summary>
+	/// Copies data element-wise into from a TransferBuffer to a GpuBuffer.
+	/// </summary>
+	public void UploadToBuffer<T>(
+		TransferBuffer transferBuffer,
+		GpuBuffer buffer,
+		uint sourceStartElement,
+		uint destinationStartElement,
+		uint numElements,
+		bool cycle
+	) where T : unmanaged
+	{
+		var elementSize = Marshal.SizeOf<T>();
+		var dataLengthInBytes = (uint) (elementSize * numElements);
+		var srcOffsetInBytes = (uint) (elementSize * sourceStartElement);
+		var dstOffsetInBytes = (uint) (elementSize * destinationStartElement);
+
+		UploadToBuffer(
+			transferBuffer,
+			buffer,
+			new BufferCopy(srcOffsetInBytes, dstOffsetInBytes, dataLengthInBytes),
+			cycle
+		);
+	}
+
+	/// <summary>
+	/// Copies the contents of a TextureRegion to another TextureRegion.
+	/// The regions must have the same dimensions.
+	/// This copy occurs on the GPU timeline.
+	///
+	/// You MAY assume that the copy has finished in subsequent commands.
+	/// </summary>
+	public void CopyTextureToTexture(
+		in TextureRegion source,
+		in TextureRegion destination,
+		bool cycle
+	) {
+#if DEBUG
+		AssertTextureBoundsCheck(destination.Size, source.Size);
+
+		if (source.Width != destination.Width || source.Height != destination.Height || source.Depth != destination.Depth)
+		{
+			throw new System.InvalidOperationException("Texture copy must have the same dimensions!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuCopyTextureToTexture(
+			Handle,
+			source.ToSDL(),
+			destination.ToSDL(),
+			Conversions.BoolToInt(cycle)
+		);
+	}
+
+	/// <summary>
+	/// Copies data from a GpuBuffer to another GpuBuffer.
+	/// This copy occurs on the GPU timeline.
+	///
+	/// You MAY assume that the copy has finished in subsequent commands.
+	/// </summary>
+	public void CopyBufferToBuffer(
+		GpuBuffer source,
+		GpuBuffer destination,
+		in BufferCopy copyParams,
+		bool cycle
+	) {
+#if DEBUG
+		AssertBufferBoundsCheck(source.Size, copyParams.SrcOffset, copyParams.Size);
+		AssertBufferBoundsCheck(destination.Size, copyParams.DstOffset, copyParams.Size);
+#endif
+
+		SDL_Gpu.SDL_GpuCopyBufferToBuffer(
+			Handle,
+			source.Handle,
+			destination.Handle,
+			copyParams.ToSDL(),
+			Conversions.BoolToInt(cycle)
+		);
+	}
+
+#if DEBUG
+	private void AssertBufferBoundsCheck(uint bufferLengthInBytes, uint offsetInBytes, uint copyLengthInBytes)
+	{
+		if (copyLengthInBytes > bufferLengthInBytes + offsetInBytes)
+		{
+			throw new System.InvalidOperationException($"SetBufferData overflow! buffer length {bufferLengthInBytes}, offset {offsetInBytes}, copy length {copyLengthInBytes}");
+		}
+	}
+
+	private void AssertTextureBoundsCheck(uint textureSizeInBytes, uint dataLengthInBytes)
+	{
+		if (dataLengthInBytes > textureSizeInBytes)
+		{
+			throw new System.InvalidOperationException($"SetTextureData overflow! texture size {textureSizeInBytes}, data size {dataLengthInBytes}");
+		}
+	}
+#endif
+}

src/Graphics/CopyPassPool.cs

@@ -0,0 +1,25 @@
+using System.Collections.Concurrent;
+
+namespace MoonWorks.Graphics;
+
+internal class CopyPassPool
+{
+	private ConcurrentQueue<CopyPass> CopyPasses = new ConcurrentQueue<CopyPass>();
+
+	public CopyPass Obtain()
+	{
+		if (CopyPasses.TryDequeue(out var copyPass))
+		{
+			return copyPass;
+		}
+		else
+		{
+			return new CopyPass();
+		}
+	}
+
+	public void Return(CopyPass copyPass)
+	{
+		CopyPasses.Enqueue(copyPass);
+	}
+}

src/Graphics/Font/Font.cs

@@ -47,7 +47,13 @@ namespace MoonWorks.Graphics.Font
 				out float distanceRange
 			);
 
-			var texture = Texture.FromImageFile(graphicsDevice, commandBuffer, Path.ChangeExtension(fontPath, ".png"));
+			var imagePath = Path.ChangeExtension(fontPath, ".png");
+			ImageUtils.ImageInfoFromFile(imagePath, out var width, out var height, out var sizeInBytes);
+
+			var uploader = new ResourceUploader(graphicsDevice);
+			var texture = uploader.CreateTexture2DFromCompressed(imagePath);
+			uploader.Upload();
+			uploader.Dispose();
 
 			NativeMemory.Free(fontFileByteBuffer);
 			NativeMemory.Free(atlasFileByteBuffer);

src/Graphics/Font/TextBatch.cs

@@ -13,10 +13,12 @@ namespace MoonWorks.Graphics.Font
 		private GraphicsDevice GraphicsDevice { get; }
 		public IntPtr Handle { get; }
 
-		public Buffer VertexBuffer { get; protected set; } = null;
+		public GpuBuffer VertexBuffer { get; protected set; } = null;
-		public Buffer IndexBuffer { get; protected set; } = null;
+		public GpuBuffer IndexBuffer { get; protected set; } = null;
 		public uint PrimitiveCount { get; protected set; }
 
+		private TransferBuffer TransferBuffer;
+
 		public Font CurrentFont { get; private set; }
 
 		private byte* StringBytes;
@@ -30,8 +32,10 @@ namespace MoonWorks.Graphics.Font
 			StringBytesLength = 128;
 			StringBytes = (byte*) NativeMemory.Alloc((nuint) StringBytesLength);
 
-			VertexBuffer = Buffer.Create<Vertex>(GraphicsDevice, BufferUsageFlags.Vertex, INITIAL_VERTEX_COUNT);
+			VertexBuffer = GpuBuffer.Create<Vertex>(GraphicsDevice, BufferUsageFlags.Vertex, INITIAL_VERTEX_COUNT);
-			IndexBuffer = Buffer.Create<uint>(GraphicsDevice, BufferUsageFlags.Index, INITIAL_INDEX_COUNT);
+			IndexBuffer = GpuBuffer.Create<uint>(GraphicsDevice, BufferUsageFlags.Index, INITIAL_INDEX_COUNT);
+
+			TransferBuffer = TransferBuffer.Create<byte>(GraphicsDevice, TransferUsage.Buffer, VertexBuffer.Size + IndexBuffer.Size);
 		}
 
 		// Call this to initialize or reset the batch.
@@ -93,22 +97,40 @@ namespace MoonWorks.Graphics.Font
 				out uint indexDataLengthInBytes
 			);
 
+			var vertexSpan = new Span<byte>((void*) vertexDataPointer, (int) vertexDataLengthInBytes);
+			var indexSpan = new Span<byte>((void*) indexDataPointer, (int) indexDataLengthInBytes);
+
+			var newTransferBufferNeeded = false;
+
 			if (VertexBuffer.Size < vertexDataLengthInBytes)
 			{
 				VertexBuffer.Dispose();
-				VertexBuffer = new Buffer(GraphicsDevice, BufferUsageFlags.Vertex, vertexDataLengthInBytes);
+				VertexBuffer = new GpuBuffer(GraphicsDevice, BufferUsageFlags.Vertex, vertexDataLengthInBytes);
+				newTransferBufferNeeded = true;
 			}
 
 			if (IndexBuffer.Size < indexDataLengthInBytes)
 			{
 				IndexBuffer.Dispose();
-				IndexBuffer = new Buffer(GraphicsDevice, BufferUsageFlags.Index, vertexDataLengthInBytes);
+				IndexBuffer = new GpuBuffer(GraphicsDevice, BufferUsageFlags.Index, vertexDataLengthInBytes);
+				newTransferBufferNeeded = true;
+			}
+
+			if (newTransferBufferNeeded)
+			{
+				TransferBuffer.Dispose();
+				TransferBuffer = new TransferBuffer(GraphicsDevice, TransferUsage.Buffer, VertexBuffer.Size + IndexBuffer.Size);
 			}
 
 			if (vertexDataLengthInBytes > 0 && indexDataLengthInBytes > 0)
 			{
-				commandBuffer.SetBufferData(VertexBuffer, vertexDataPointer, 0, vertexDataLengthInBytes);
+				TransferBuffer.SetData(vertexSpan, TransferOptions.Cycle);
-				commandBuffer.SetBufferData(IndexBuffer, indexDataPointer, 0, indexDataLengthInBytes);
+				TransferBuffer.SetData(indexSpan, (uint) vertexSpan.Length, TransferOptions.Unsafe);
+
+				commandBuffer.BeginCopyPass();
+				commandBuffer.UploadToBuffer(TransferBuffer, VertexBuffer, new BufferCopy(0, 0, (uint) vertexSpan.Length), WriteOptions.Cycle);
+				commandBuffer.UploadToBuffer(TransferBuffer, IndexBuffer, new BufferCopy((uint) vertexSpan.Length, 0, (uint) indexSpan.Length), WriteOptions.Cycle);
+				commandBuffer.EndCopyPass();
 			}
 
 			PrimitiveCount = vertexCount / 2;
@@ -123,12 +145,12 @@ namespace MoonWorks.Graphics.Font
 			));
 			commandBuffer.BindVertexBuffers(VertexBuffer);
 			commandBuffer.BindIndexBuffer(IndexBuffer, IndexElementSize.ThirtyTwo);
+			commandBuffer.PushVertexShaderUniforms(transformMatrix);
+			commandBuffer.PushFragmentShaderUniforms(CurrentFont.DistanceRange);
 			commandBuffer.DrawIndexedPrimitives(
 				0,
 				0,
-				PrimitiveCount,
+				PrimitiveCount
-				commandBuffer.PushVertexShaderUniforms(transformMatrix),
-				commandBuffer.PushFragmentShaderUniforms(CurrentFont.DistanceRange)
 			);
 		}
 

src/Graphics/GraphicsDevice.cs

@@ -3,8 +3,8 @@ using System.Collections.Generic;
 using System.IO;
 using System.Runtime.InteropServices;
 using MoonWorks.Video;
-using RefreshCS;
+using SDL2;
-using WellspringCS;
+using SDL2_gpuCS;
 
 namespace MoonWorks.Graphics
 {
@@ -14,7 +14,8 @@ namespace MoonWorks.Graphics
 	public class GraphicsDevice : IDisposable
 	{
 		public IntPtr Handle { get; }
-		public Backend Backend { get; }
+		public BackendFlags Backend { get; }
+		public bool DebugMode { get; }
 
 		private uint windowFlags;
 		public SDL2.SDL.SDL_WindowFlags WindowFlags => (SDL2.SDL.SDL_WindowFlags) windowFlags;
@@ -23,8 +24,10 @@ namespace MoonWorks.Graphics
 		internal GraphicsPipeline VideoPipeline { get; }
 
 		// Built-in text shader info
-		public GraphicsShaderInfo TextVertexShaderInfo { get; }
+		public Shader TextVertexShader;
-		public GraphicsShaderInfo TextFragmentShaderInfo { get; }
+		public Shader TextFragmentShader;
+		public GraphicsPipelineResourceInfo TextVertexShaderInfo { get; }
+		public GraphicsPipelineResourceInfo TextFragmentShaderInfo { get; }
 		public VertexInputState TextVertexInputState { get; }
 
 		// Built-in samplers
@@ -34,62 +37,115 @@ namespace MoonWorks.Graphics
 		public bool IsDisposed { get; private set; }
 
 		private readonly HashSet<GCHandle> resources = new HashSet<GCHandle>();
-		private FencePool FencePool;
 		private CommandBufferPool CommandBufferPool;
+		private FencePool FencePool;
+		internal RenderPassPool RenderPassPool;
+		internal ComputePassPool ComputePassPool;
+		internal CopyPassPool CopyPassPool;
 
-		internal GraphicsDevice(
+		internal unsafe GraphicsDevice(
-			Backend preferredBackend,
+			BackendFlags preferredBackends,
 			bool debugMode
 		) {
-			Backend = (Backend) Refresh.Refresh_SelectBackend((Refresh.Backend) preferredBackend, out windowFlags);
+			if (preferredBackends == BackendFlags.Invalid)
-
-			if (Backend == Backend.Invalid)
 			{
 				throw new System.Exception("Could not set graphics backend!");
 			}
 
-			Handle = Refresh.Refresh_CreateDevice(
+			Handle = SDL_Gpu.SDL_GpuCreateDevice(
+				(SDL_Gpu.BackendFlags) preferredBackends,
 				Conversions.BoolToByte(debugMode)
 			);
 
+			DebugMode = debugMode;
 			// TODO: check for CreateDevice fail
 
+			Backend = (BackendFlags) SDL_Gpu.SDL_GpuGetBackend(Handle);
+
 			// Check for replacement stock shaders
 			string basePath = System.AppContext.BaseDirectory;
 
-			string videoVertPath = Path.Combine(basePath, "video_fullscreen.vert.refresh");
+			string fullscreenVertPath = Path.Combine(basePath, "fullscreen.vert.refresh");
-			string videoFragPath = Path.Combine(basePath, "video_yuv2rgba.frag.refresh");
 
 			string textVertPath = Path.Combine(basePath, "text_transform.vert.refresh");
 			string textFragPath = Path.Combine(basePath, "text_msdf.frag.refresh");
 
-			ShaderModule videoVertShader;
+			string videoFragPath = Path.Combine(basePath, "video_yuv2rgba.frag.refresh");
-			ShaderModule videoFragShader;
+			string blitFragPath = Path.Combine(basePath, "blit.frag.refresh");
 
-			ShaderModule textVertShader;
+			Shader fullscreenVertShader;
-			ShaderModule textFragShader;
 
-			if (File.Exists(videoVertPath) && File.Exists(videoFragPath))
+			Shader textVertShader;
+			Shader textFragShader;
+
+			Shader videoFragShader;
+			Shader blitFragShader;
+
+			if (File.Exists(fullscreenVertPath))
 			{
-				videoVertShader = new ShaderModule(this, videoVertPath);
+				fullscreenVertShader = new Shader(
-				videoFragShader = new ShaderModule(this, videoFragPath);
+					this,
+					fullscreenVertPath,
+					"main",
+					ShaderStage.Vertex,
+					ShaderFormat.SECRET
+				);
 			}
 			else
 			{
 				// use defaults
 				var assembly = typeof(GraphicsDevice).Assembly;
+				using var vertStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.Fullscreen.vert.refresh");
+				fullscreenVertShader = new Shader(
+					this,
+					vertStream,
+					"main",
+					ShaderStage.Vertex,
+					ShaderFormat.SPIRV
+				);
+			}
 
-				using var vertStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.VideoFullscreen.vert.refresh");
+			if (File.Exists(videoFragPath))
+			{
+				videoFragShader = new Shader(
+					this,
+					videoFragPath,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SECRET
+				);
+			}
+			else
+			{
+				// use defaults
+				var assembly = typeof(GraphicsDevice).Assembly;
 				using var fragStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.VideoYUV2RGBA.frag.refresh");
-
+				videoFragShader = new Shader(
-				videoVertShader = new ShaderModule(this, vertStream);
+					this,
-				videoFragShader = new ShaderModule(this, fragStream);
+					fragStream,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SPIRV
+				);
 			}
 
 			if (File.Exists(textVertPath) && File.Exists(textFragPath))
 			{
-				textVertShader = new ShaderModule(this, textVertPath);
+				textVertShader = new Shader(
-				textFragShader = new ShaderModule(this, textFragPath);
+					this,
+					textVertPath,
+					"main",
+					ShaderStage.Vertex,
+					ShaderFormat.SECRET
+				);
+
+				textFragShader = new Shader(
+					this,
+					textFragPath,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SECRET
+				);
 			}
 			else
 			{
@@ -99,8 +155,46 @@ namespace MoonWorks.Graphics
 				using var vertStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.TextTransform.vert.refresh");
 				using var fragStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.TextMSDF.frag.refresh");
 
-				textVertShader = new ShaderModule(this, vertStream);
+				textVertShader = new Shader(
-				textFragShader = new ShaderModule(this, fragStream);
+					this,
+					vertStream,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SPIRV
+				);
+
+				textFragShader = new Shader(
+					this,
+					fragStream,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SPIRV
+				);
+			}
+
+			if (File.Exists(blitFragPath))
+			{
+				blitFragShader = new Shader(
+					this,
+					blitFragPath,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SECRET
+				);
+			}
+			else
+			{
+				// use defaults
+				var assembly = typeof(GraphicsDevice).Assembly;
+
+				using var fragStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.Blit.frag.refresh");
+				blitFragShader = new Shader(
+					this,
+					fragStream,
+					"main",
+					ShaderStage.Fragment,
+					ShaderFormat.SPIRV
+				);
 			}
 
 			VideoPipeline = new GraphicsPipeline(
@@ -114,16 +208,12 @@ namespace MoonWorks.Graphics
 						)
 					),
 					DepthStencilState = DepthStencilState.Disable,
-					VertexShaderInfo = GraphicsShaderInfo.Create(
+					VertexShader = fullscreenVertShader,
-						videoVertShader,
+					FragmentShader = videoFragShader,
-						"main",
+					FragmentShaderResourceInfo = new GraphicsPipelineResourceInfo
-						0
+					{
-					),
+						SamplerCount = 3
-					FragmentShaderInfo = GraphicsShaderInfo.Create(
+					},
-						videoFragShader,
-						"main",
-						3
-					),
 					VertexInputState = VertexInputState.Empty,
 					RasterizerState = RasterizerState.CCW_CullNone,
 					PrimitiveType = PrimitiveType.TriangleList,
@@ -131,8 +221,15 @@ namespace MoonWorks.Graphics
 				}
 			);
 
-			TextVertexShaderInfo = GraphicsShaderInfo.Create<Math.Float.Matrix4x4>(textVertShader, "main", 0);
+			TextVertexShader = textVertShader;
-			TextFragmentShaderInfo = GraphicsShaderInfo.Create<float>(textFragShader, "main", 1);
+			TextVertexShaderInfo = new GraphicsPipelineResourceInfo();
+
+			TextFragmentShader = textFragShader;
+			TextFragmentShaderInfo = new GraphicsPipelineResourceInfo
+			{
+				SamplerCount = 1
+			};
+
 			TextVertexInputState = VertexInputState.CreateSingleBinding<Font.Vertex>();
 
 			PointSampler = new Sampler(this, SamplerCreateInfo.PointClamp);
@@ -145,28 +242,35 @@ namespace MoonWorks.Graphics
 		/// <summary>
 		/// Prepares a window so that frames can be presented to it.
 		/// </summary>
+		/// <param name="swapchainComposition">The desired composition of the swapchain. Ignore this unless you are using HDR or tonemapping.</param>
 		/// <param name="presentMode">The desired presentation mode for the window. Roughly equivalent to V-Sync.</param>
 		/// <returns>True if successfully claimed.</returns>
-		public bool ClaimWindow(Window window, PresentMode presentMode)
+		public bool ClaimWindow(
-		{
+			Window window,
+			SwapchainComposition swapchainComposition,
+			PresentMode presentMode
+		) {
 			if (window.Claimed)
 			{
 				Logger.LogError("Window already claimed!");
 				return false;
 			}
 
-			var success = Conversions.ByteToBool(
+			var success = Conversions.IntToBool(
-				Refresh.Refresh_ClaimWindow(
+				SDL_Gpu.SDL_GpuClaimWindow(
 					Handle,
 					window.Handle,
-					(Refresh.PresentMode) presentMode
+					(SDL_Gpu.SwapchainComposition) swapchainComposition,
+					(SDL_Gpu.PresentMode) presentMode
 				)
 			);
 
 			if (success)
 			{
 				window.Claimed = true;
+				window.SwapchainComposition = swapchainComposition;
 				window.SwapchainFormat = GetSwapchainFormat(window);
+
 				if (window.SwapchainTexture == null)
 				{
 					window.SwapchainTexture = new Texture(this, window.SwapchainFormat);
@@ -183,7 +287,7 @@ namespace MoonWorks.Graphics
 		{
 			if (window.Claimed)
 			{
-				Refresh.Refresh_UnclaimWindow(
+				SDL_Gpu.SDL_GpuUnclaimWindow(
 					Handle,
 					window.Handle
 				);
@@ -201,18 +305,22 @@ namespace MoonWorks.Graphics
 		/// </summary>
 		/// <param name="window"></param>
 		/// <param name="presentMode"></param>
-		public void SetPresentMode(Window window, PresentMode presentMode)
+		public void SetSwapchainParameters(
-		{
+			Window window,
+			SwapchainComposition swapchainComposition,
+			PresentMode presentMode
+		) {
 			if (!window.Claimed)
 			{
 				Logger.LogError("Cannot set present mode on unclaimed window!");
 				return;
 			}
 
-			Refresh.Refresh_SetSwapchainPresentMode(
+			SDL_Gpu.SDL_GpuSetSwapchainParameters(
 				Handle,
 				window.Handle,
-				(Refresh.PresentMode) presentMode
+				(SDL_Gpu.SwapchainComposition) swapchainComposition,
+				(SDL_Gpu.PresentMode) presentMode
 			);
 		}
 
@@ -224,7 +332,7 @@ namespace MoonWorks.Graphics
 		public CommandBuffer AcquireCommandBuffer()
 		{
 			var commandBuffer = CommandBufferPool.Obtain();
-			commandBuffer.SetHandle(Refresh.Refresh_AcquireCommandBuffer(Handle));
+			commandBuffer.SetHandle(SDL_Gpu.SDL_GpuAcquireCommandBuffer(Handle));
 #if DEBUG
 			commandBuffer.ResetStateTracking();
 #endif
@@ -243,8 +351,7 @@ namespace MoonWorks.Graphics
 			}
 #endif
 
-			Refresh.Refresh_Submit(
+			SDL_Gpu.SDL_GpuSubmit(
-				Handle,
 				commandBuffer.Handle
 			);
 
@@ -261,8 +368,7 @@ namespace MoonWorks.Graphics
 		/// <returns></returns>
 		public Fence SubmitAndAcquireFence(CommandBuffer commandBuffer)
 		{
-			var fenceHandle = Refresh.Refresh_SubmitAndAcquireFence(
+			var fenceHandle = SDL_Gpu.SDL_GpuSubmitAndAcquireFence(
-				Handle,
 				commandBuffer.Handle
 			);
 
@@ -277,7 +383,7 @@ namespace MoonWorks.Graphics
 		/// </summary>
 		public void Wait()
 		{
-			Refresh.Refresh_Wait(Handle);
+			SDL_Gpu.SDL_GpuWait(Handle);
 		}
 
 		/// <summary>
@@ -285,14 +391,13 @@ namespace MoonWorks.Graphics
 		/// </summary>
 		public unsafe void WaitForFences(Fence fence)
 		{
-			var handlePtr = stackalloc nint[1];
+			var fenceHandle = fence.Handle;
-			handlePtr[0] = fence.Handle;
 
-			Refresh.Refresh_WaitForFences(
+			SDL_Gpu.SDL_GpuWaitForFences(
 				Handle,
 				1,
 				1,
-				(nint) handlePtr
+				&fenceHandle
 			);
 		}
 
@@ -309,11 +414,11 @@ namespace MoonWorks.Graphics
 			handlePtr[0] = fenceOne.Handle;
 			handlePtr[1] = fenceTwo.Handle;
 
-			Refresh.Refresh_WaitForFences(
+			SDL_Gpu.SDL_GpuWaitForFences(
 				Handle,
-				Conversions.BoolToByte(waitAll),
+				Conversions.BoolToInt(waitAll),
 				2,
-				(nint) handlePtr
+				handlePtr
 			);
 		}
 
@@ -332,11 +437,11 @@ namespace MoonWorks.Graphics
 			handlePtr[1] = fenceTwo.Handle;
 			handlePtr[2] = fenceThree.Handle;
 
-			Refresh.Refresh_WaitForFences(
+			SDL_Gpu.SDL_GpuWaitForFences(
 				Handle,
-				Conversions.BoolToByte(waitAll),
+				Conversions.BoolToInt(waitAll),
 				3,
-				(nint) handlePtr
+				handlePtr
 			);
 		}
 
@@ -357,11 +462,11 @@ namespace MoonWorks.Graphics
 			handlePtr[2] = fenceThree.Handle;
 			handlePtr[3] = fenceFour.Handle;
 
-			Refresh.Refresh_WaitForFences(
+			SDL_Gpu.SDL_GpuWaitForFences(
 				Handle,
-				Conversions.BoolToByte(waitAll),
+				Conversions.BoolToInt(waitAll),
 				4,
-				(nint) handlePtr
+				handlePtr
 			);
 		}
 
@@ -369,7 +474,7 @@ namespace MoonWorks.Graphics
 		/// Wait for one or more fences to become signaled.
 		/// </summary>
 		/// <param name="waitAll">If true, will wait for all given fences to be signaled.</param>
-		public unsafe void WaitForFences(Fence[] fences, bool waitAll)
+		public unsafe void WaitForFences(Span<Fence> fences, bool waitAll)
 		{
 			var handlePtr = stackalloc nint[fences.Length];
 
@@ -378,11 +483,11 @@ namespace MoonWorks.Graphics
 				handlePtr[i] = fences[i].Handle;
 			}
 
-			Refresh.Refresh_WaitForFences(
+			SDL_Gpu.SDL_GpuWaitForFences(
 				Handle,
-				Conversions.BoolToByte(waitAll),
+				Conversions.BoolToInt(waitAll),
 				4,
-				(nint) handlePtr
+				handlePtr
 			);
 		}
 
@@ -392,7 +497,7 @@ namespace MoonWorks.Graphics
 		/// <exception cref="InvalidOperationException">Throws if the fence query indicates that the graphics device has been lost.</exception>
 		public bool QueryFence(Fence fence)
 		{
-			var result = Refresh.Refresh_QueryFence(Handle, fence.Handle);
+			var result = SDL_Gpu.SDL_GpuQueryFence(Handle, fence.Handle);
 
 			if (result < 0)
 			{
@@ -407,14 +512,19 @@ namespace MoonWorks.Graphics
 		/// </summary>
 		public void ReleaseFence(Fence fence)
 		{
-			Refresh.Refresh_ReleaseFence(Handle, fence.Handle);
+			SDL_Gpu.SDL_GpuReleaseFence(Handle, fence.Handle);
 			fence.Handle = IntPtr.Zero;
 			FencePool.Return(fence);
 		}
 
 		private TextureFormat GetSwapchainFormat(Window window)
 		{
-			return (TextureFormat) Refresh.Refresh_GetSwapchainFormat(Handle, window.Handle);
+			if (!window.Claimed)
+			{
+				throw new System.ArgumentException("Cannot get swapchain format of unclaimed window!");
+			}
+
+			return (TextureFormat) SDL_Gpu.SDL_GpuGetSwapchainTextureFormat(Handle, window.Handle);
 		}
 
 		internal void AddResourceReference(GCHandle resourceReference)
@@ -462,7 +572,7 @@ namespace MoonWorks.Graphics
 					}
 				}
 
-				Refresh.Refresh_DestroyDevice(Handle);
+				SDL_Gpu.SDL_GpuDestroyDevice(Handle);
 
 				IsDisposed = true;
 			}

src/Graphics/ImageUtils.cs

@@ -0,0 +1,457 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using RefreshCS;
+using SDL2;
+
+namespace MoonWorks.Graphics
+{
+	public static class ImageUtils
+	{
+		/// <summary>
+		/// Gets pointer to pixel data from compressed image byte data.
+		///
+		/// The returned pointer must be freed by calling FreePixelData.
+		/// </summary>
+		public static unsafe IntPtr GetPixelDataFromBytes(
+			Span<byte> data,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			fixed (byte* ptr = data)
+			{
+				var pixelData =
+					Refresh.Refresh_Image_Load(
+					(nint) ptr,
+					data.Length,
+					out var w,
+					out var h,
+					out var len
+				);
+
+				width = (uint) w;
+				height = (uint) h;
+				sizeInBytes = (uint) len;
+
+				return pixelData;
+			}
+		}
+
+		/// <summary>
+		/// Gets pointer to pixel data from a compressed image stream.
+		///
+		/// The returned pointer must be freed by calling FreePixelData.
+		/// </summary>
+		public static unsafe IntPtr GetPixelDataFromStream(
+			Stream stream,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			var length = stream.Length;
+			var buffer = NativeMemory.Alloc((nuint) length);
+			var span = new Span<byte>(buffer, (int) length);
+			stream.ReadExactly(span);
+
+			var pixelData = GetPixelDataFromBytes(span, out width, out height, out sizeInBytes);
+
+			NativeMemory.Free(buffer);
+
+			return pixelData;
+		}
+
+		/// <summary>
+		/// Gets pointer to pixel data from a compressed image file.
+		///
+		/// The returned pointer must be freed by calling FreePixelData.
+		/// </summary>
+		public static IntPtr GetPixelDataFromFile(
+			string path,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
+			return GetPixelDataFromStream(fileStream, out width, out height, out sizeInBytes);
+		}
+
+		/// <summary>
+		/// Get metadata from compressed image bytes.
+		/// </summary>
+		public static unsafe bool ImageInfoFromBytes(
+			Span<byte> data,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			fixed (byte* ptr = data)
+			{
+				var result =
+					Refresh.Refresh_Image_Info(
+					(nint) ptr,
+					data.Length,
+					out var w,
+					out var h,
+					out var len
+				);
+
+				width = (uint) w;
+				height = (uint) h;
+				sizeInBytes = (uint) len;
+
+				return Conversions.ByteToBool(result);
+			}
+		}
+
+		/// <summary>
+		/// Get metadata from a compressed image stream.
+		/// </summary>
+		public static unsafe bool ImageInfoFromStream(
+			Stream stream,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			var length = stream.Length;
+			var buffer = NativeMemory.Alloc((nuint) length);
+			var span = new Span<byte>(buffer, (int) length);
+			stream.ReadExactly(span);
+
+			var result = ImageInfoFromBytes(span, out width, out height, out sizeInBytes);
+
+			NativeMemory.Free(buffer);
+
+			return result;
+		}
+
+		/// <summary>
+		/// Get metadata from a compressed image file.
+		/// </summary>
+		public static bool ImageInfoFromFile(
+			string path,
+			out uint width,
+			out uint height,
+			out uint sizeInBytes
+		) {
+			var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
+			return ImageInfoFromStream(fileStream, out width, out height, out sizeInBytes);
+		}
+
+		/// <summary>
+		/// Frees pixel data obtained from GetPixelData methods.
+		/// </summary>
+		public static void FreePixelData(IntPtr pixels)
+		{
+			Refresh.Refresh_Image_Free(pixels);
+		}
+
+		/// <summary>
+		/// Saves pixel data contained in a TransferBuffer to a PNG file.
+		/// </summary>
+		public static unsafe void SavePNG(
+			string path,
+			TransferBuffer transferBuffer,
+			uint bufferOffsetInBytes,
+			int width,
+			int height,
+			bool bgra
+		) {
+			var sizeInBytes = width * height * 4;
+
+			var pixelsPtr = NativeMemory.Alloc((nuint) sizeInBytes);
+			var pixelsSpan = new Span<byte>(pixelsPtr, sizeInBytes);
+
+			transferBuffer.GetData(pixelsSpan, bufferOffsetInBytes);
+
+			if (bgra)
+			{
+				// if data is bgra, we have to swap the R and B channels
+				var rgbaPtr = NativeMemory.Alloc((nuint) sizeInBytes);
+				var rgbaSpan = new Span<byte>(rgbaPtr, sizeInBytes);
+
+				for (var i = 0; i < sizeInBytes; i += 4)
+				{
+					rgbaSpan[i] = pixelsSpan[i + 2];
+					rgbaSpan[i + 1] = pixelsSpan[i + 1];
+					rgbaSpan[i + 2] = pixelsSpan[i];
+					rgbaSpan[i + 3] = pixelsSpan[i + 3];
+				}
+
+				NativeMemory.Free(pixelsPtr);
+				pixelsPtr = rgbaPtr;
+			}
+
+			Refresh.Refresh_Image_SavePNG(path, (nint) pixelsPtr, width, height);
+			NativeMemory.Free(pixelsPtr);
+		}
+
+		// DDS loading extension, based on MojoDDS
+		// Taken from https://github.com/FNA-XNA/FNA/blob/1e49f868f595f62bc6385db45949a03186a7cd7f/src/Graphics/Texture.cs#L194
+		public static void ParseDDS(
+			BinaryReader reader,
+			out TextureFormat format,
+			out int width,
+			out int height,
+			out int levels,
+			out bool isCube
+		) {
+			// A whole bunch of magic numbers, yay DDS!
+			const uint DDS_MAGIC = 0x20534444;
+			const uint DDS_HEADERSIZE = 124;
+			const uint DDS_PIXFMTSIZE = 32;
+			const uint DDSD_HEIGHT = 0x2;
+			const uint DDSD_WIDTH = 0x4;
+			const uint DDSD_PITCH = 0x8;
+			const uint DDSD_LINEARSIZE = 0x80000;
+			const uint DDSD_REQ = (
+				DDSD_HEIGHT | DDSD_WIDTH
+			);
+			const uint DDSCAPS_MIPMAP = 0x400000;
+			const uint DDSCAPS_TEXTURE = 0x1000;
+			const uint DDSCAPS2_CUBEMAP = 0x200;
+			const uint DDPF_FOURCC = 0x4;
+			const uint DDPF_RGB = 0x40;
+			const uint FOURCC_DXT1 = 0x31545844;
+			const uint FOURCC_DXT3 = 0x33545844;
+			const uint FOURCC_DXT5 = 0x35545844;
+			const uint FOURCC_DX10 = 0x30315844;
+			const uint pitchAndLinear = (
+				DDSD_PITCH | DDSD_LINEARSIZE
+			);
+
+			// File should start with 'DDS '
+			if (reader.ReadUInt32() != DDS_MAGIC)
+			{
+				throw new NotSupportedException("Not a DDS!");
+			}
+
+			// Texture info
+			uint size = reader.ReadUInt32();
+			if (size != DDS_HEADERSIZE)
+			{
+				throw new NotSupportedException("Invalid DDS header!");
+			}
+			uint flags = reader.ReadUInt32();
+			if ((flags & DDSD_REQ) != DDSD_REQ)
+			{
+				throw new NotSupportedException("Invalid DDS flags!");
+			}
+			if ((flags & pitchAndLinear) == pitchAndLinear)
+			{
+				throw new NotSupportedException("Invalid DDS flags!");
+			}
+			height = reader.ReadInt32();
+			width = reader.ReadInt32();
+			reader.ReadUInt32(); // dwPitchOrLinearSize, unused
+			reader.ReadUInt32(); // dwDepth, unused
+			levels = reader.ReadInt32();
+
+			// "Reserved"
+			reader.ReadBytes(4 * 11);
+
+			// Format info
+			uint formatSize = reader.ReadUInt32();
+			if (formatSize != DDS_PIXFMTSIZE)
+			{
+				throw new NotSupportedException("Bogus PIXFMTSIZE!");
+			}
+			uint formatFlags = reader.ReadUInt32();
+			uint formatFourCC = reader.ReadUInt32();
+			uint formatRGBBitCount = reader.ReadUInt32();
+			uint formatRBitMask = reader.ReadUInt32();
+			uint formatGBitMask = reader.ReadUInt32();
+			uint formatBBitMask = reader.ReadUInt32();
+			uint formatABitMask = reader.ReadUInt32();
+
+			// dwCaps "stuff"
+			uint caps = reader.ReadUInt32();
+			if ((caps & DDSCAPS_TEXTURE) == 0)
+			{
+				throw new NotSupportedException("Not a texture!");
+			}
+
+			isCube = false;
+
+			uint caps2 = reader.ReadUInt32();
+			if (caps2 != 0)
+			{
+				if ((caps2 & DDSCAPS2_CUBEMAP) == DDSCAPS2_CUBEMAP)
+				{
+					isCube = true;
+				}
+				else
+				{
+					throw new NotSupportedException("Invalid caps2!");
+				}
+			}
+
+			reader.ReadUInt32(); // dwCaps3, unused
+			reader.ReadUInt32(); // dwCaps4, unused
+
+			// "Reserved"
+			reader.ReadUInt32();
+
+			// Mipmap sanity check
+			if ((caps & DDSCAPS_MIPMAP) != DDSCAPS_MIPMAP)
+			{
+				levels = 1;
+			}
+
+			// Determine texture format
+			if ((formatFlags & DDPF_FOURCC) == DDPF_FOURCC)
+			{
+				switch (formatFourCC)
+				{
+					case 0x71: // D3DFMT_A16B16G16R16F
+						format = TextureFormat.R16G16B16A16_SFLOAT;
+						break;
+					case 0x74: // D3DFMT_A32B32G32R32F
+						format = TextureFormat.R32G32B32A32_SFLOAT;
+						break;
+					case FOURCC_DXT1:
+						format = TextureFormat.BC1;
+						break;
+					case FOURCC_DXT3:
+						format = TextureFormat.BC2;
+						break;
+					case FOURCC_DXT5:
+						format = TextureFormat.BC3;
+						break;
+					case FOURCC_DX10:
+						// If the fourCC is DX10, there is an extra header with additional format information.
+						uint dxgiFormat = reader.ReadUInt32();
+
+						// These values are taken from the DXGI_FORMAT enum.
+						switch (dxgiFormat)
+						{
+							case 2:
+								format = TextureFormat.R32G32B32A32_SFLOAT;
+								break;
+
+							case 10:
+								format = TextureFormat.R16G16B16A16_SFLOAT;
+								break;
+
+							case 71:
+								format = TextureFormat.BC1;
+								break;
+
+							case 74:
+								format = TextureFormat.BC2;
+								break;
+
+							case 77:
+								format = TextureFormat.BC3;
+								break;
+
+							case 98:
+								format = TextureFormat.BC7;
+								break;
+
+							default:
+								throw new NotSupportedException(
+									"Unsupported DDS texture format"
+								);
+						}
+
+						uint resourceDimension = reader.ReadUInt32();
+
+						// These values are taken from the D3D10_RESOURCE_DIMENSION enum.
+						switch (resourceDimension)
+						{
+							case 0: // Unknown
+							case 1: // Buffer
+								throw new NotSupportedException(
+									"Unsupported DDS texture format"
+								);
+							default:
+								break;
+						}
+
+						/*
+						 * This flag seemingly only indicates if the texture is a cube map.
+						 * This is already determined above. Cool!
+						 */
+						uint miscFlag = reader.ReadUInt32();
+
+						/*
+						 * Indicates the number of elements in the texture array.
+						 * We don't support texture arrays so just throw if it's greater than 1.
+						 */
+						uint arraySize = reader.ReadUInt32();
+
+						if (arraySize > 1)
+						{
+							throw new NotSupportedException(
+								"Unsupported DDS texture format"
+							);
+						}
+
+						reader.ReadUInt32(); // reserved
+
+						break;
+					default:
+						throw new NotSupportedException(
+							"Unsupported DDS texture format"
+						);
+				}
+			}
+			else if ((formatFlags & DDPF_RGB) == DDPF_RGB)
+			{
+				if (	formatRGBBitCount != 32 ||
+					formatRBitMask != 0x00FF0000 ||
+					formatGBitMask != 0x0000FF00 ||
+					formatBBitMask != 0x000000FF ||
+					formatABitMask != 0xFF000000	)
+				{
+					throw new NotSupportedException(
+						"Unsupported DDS texture format"
+					);
+				}
+
+				format = TextureFormat.B8G8R8A8;
+			}
+			else
+			{
+				throw new NotSupportedException(
+					"Unsupported DDS texture format"
+				);
+			}
+		}
+
+		public static int CalculateDDSLevelSize(
+			int width,
+			int height,
+			TextureFormat format
+		) {
+			if (format == TextureFormat.R8G8B8A8)
+			{
+				return (((width * 32) + 7) / 8) * height;
+			}
+			else if (format == TextureFormat.R16G16B16A16_SFLOAT)
+			{
+				return (((width * 64) + 7) / 8) * height;
+			}
+			else if (format == TextureFormat.R32G32B32A32_SFLOAT)
+			{
+				return (((width * 128) + 7) / 8) * height;
+			}
+			else
+			{
+				int blockSize = 16;
+				if (format == TextureFormat.BC1)
+				{
+					blockSize = 8;
+				}
+				width = System.Math.Max(width, 1);
+				height = System.Math.Max(height, 1);
+				return (
+					((width + 3) / 4) *
+					((height + 3) / 4) *
+					blockSize
+				);
+			}
+		}
+	}
+}

src/Graphics/RefreshEnums.cs

@@ -1,307 +0,0 @@
-using System;
-
-namespace MoonWorks
-{
-	/// <summary>
-	/// Presentation mode for a window.
-	/// </summary>
-	public enum PresentMode
-	{
-		/// <summary>
-		/// Does not wait for v-blank to update the window. Can cause visible tearing.
-		/// </summary>
-		Immediate,
-		/// <summary>
-		/// Waits for v-blank and uses a queue to hold present requests.
-		/// Allows for low latency while preventing tearing.
-		/// May not be supported on non-Vulkan non-Linux systems or older hardware.
-		/// </summary>
-		Mailbox,
-		/// <summary>
-		/// Waits for v-blank and adds present requests to a queue.
-		/// Will probably cause latency.
-		/// Required to be supported by all compliant hardware.
-		/// </summary>
-		FIFO,
-		/// <summary>
-		/// Usually waits for v-blank, but if v-blank has passed since last update will update immediately.
-		/// May cause visible tearing.
-		/// </summary>
-		FIFORelaxed
-	}
-}
-
-/* Recreate all the enums in here so we don't need to explicitly
- * reference the RefreshCS namespace when using MoonWorks.Graphics
- */
-namespace MoonWorks.Graphics
-{
-	public enum PrimitiveType
-	{
-		PointList,
-		LineList,
-		LineStrip,
-		TriangleList,
-		TriangleStrip
-	}
-
-	/// <summary>
-	/// Describes the operation that a render pass will use when loading a render target.
-	/// </summary>
-	public enum LoadOp
-	{
-		Load,
-		Clear,
-		DontCare
-	}
-
-	/// <summary>
-	/// Describes the operation that a render pass will use when storing a render target.
-	/// </summary>
-	public enum StoreOp
-	{
-		Store,
-		DontCare
-	}
-
-	[Flags]
-	public enum ClearOptionsFlags : uint
-	{
-		Color = 1,
-		Depth = 2,
-		Stencil = 4,
-		DepthStencil = Depth | Stencil,
-		All = Color | Depth | Stencil
-	}
-
-	public enum IndexElementSize
-	{
-		Sixteen,
-		ThirtyTwo
-	}
-
-	public enum TextureFormat
-	{
-		R8G8B8A8,
-		B8G8R8A8,
-		R5G6B5,
-		A1R5G5B5,
-		B4G4R4A4,
-		A2R10G10B10,
-		R16G16,
-		R16G16B16A16,
-		R8,
-		BC1,
-		BC2,
-		BC3,
-		BC7,
-		R8G8_SNORM,
-		R8G8B8A8_SNORM,
-		R16_SFLOAT,
-		R16G16_SFLOAT,
-		R16G16B16A16_SFLOAT,
-		R32_SFLOAT,
-		R32G32_SFLOAT,
-		R32G32B32A32_SFLOAT,
-
-		R8_UINT,
-		R8G8_UINT,
-		R8G8B8A8_UINT,
-		R16_UINT,
-		R16G16_UINT,
-		R16G16B16A16_UINT,
-		D16,
-		D32,
-		D16S8,
-		D32S8
-	}
-
-	[Flags]
-	public enum TextureUsageFlags : uint
-	{
-		Sampler = 1,
-		ColorTarget = 2,
-		DepthStencilTarget = 4,
-		Compute = 8
-	}
-
-	public enum SampleCount
-	{
-		One,
-		Two,
-		Four,
-		Eight
-	}
-
-	public enum CubeMapFace : uint
-	{
-		PositiveX,
-		NegativeX,
-		PositiveY,
-		NegativeY,
-		PositiveZ,
-		NegativeZ
-	}
-
-	[Flags]
-	public enum BufferUsageFlags : uint
-	{
-		Vertex = 1,
-		Index = 2,
-		Compute = 4,
-		Indirect = 8
-	}
-
-	public enum VertexElementFormat
-	{
-		UInt,
-		Float,
-		Vector2,
-		Vector3,
-		Vector4,
-		Color,
-		Byte4,
-		Short2,
-		Short4,
-		NormalizedShort2,
-		NormalizedShort4,
-		HalfVector2,
-		HalfVector4
-	}
-
-	public enum VertexInputRate
-	{
-		Vertex,
-		Instance
-	}
-
-	public enum FillMode
-	{
-		Fill,
-		Line
-	}
-
-	public enum CullMode
-	{
-		None,
-		Front,
-		Back
-	}
-
-	public enum FrontFace
-	{
-		CounterClockwise,
-		Clockwise
-	}
-
-	public enum CompareOp
-	{
-		Never,
-		Less,
-		Equal,
-		LessOrEqual,
-		Greater,
-		NotEqual,
-		GreaterOrEqual,
-		Always
-	}
-
-	public enum StencilOp
-	{
-		Keep,
-		Zero,
-		Replace,
-		IncrementAndClamp,
-		DecrementAndClamp,
-		Invert,
-		IncrementAndWrap,
-		DecrementAndWrap
-	}
-
-	public enum BlendOp
-	{
-		Add,
-		Subtract,
-		ReverseSubtract,
-		Min,
-		Max
-	}
-
-	public enum BlendFactor
-	{
-		Zero,
-		One,
-		SourceColor,
-		OneMinusSourceColor,
-		DestinationColor,
-		OneMinusDestinationColor,
-		SourceAlpha,
-		OneMinusSourceAlpha,
-		DestinationAlpha,
-		OneMinusDestinationAlpha,
-		ConstantColor,
-		OneMinusConstantColor,
-		SourceAlphaSaturate
-	}
-
-	[Flags]
-	public enum ColorComponentFlags : uint
-	{
-		R = 1,
-		G = 2,
-		B = 4,
-		A = 8,
-
-		RG = R | G,
-		RB = R | B,
-		RA = R | A,
-		GB = G | B,
-		GA = G | A,
-		BA = B | A,
-
-		RGB = R | G | B,
-		RGA = R | G | A,
-		GBA = G | B | A,
-
-		RGBA = R | G | B | A,
-		None = 0
-	}
-
-	public enum Filter
-	{
-		Nearest,
-		Linear
-	}
-
-	public enum SamplerMipmapMode
-	{
-		Nearest,
-		Linear
-	}
-
-	public enum SamplerAddressMode
-	{
-		Repeat,
-		MirroredRepeat,
-		ClampToEdge,
-		ClampToBorder
-	}
-
-	public enum BorderColor
-	{
-		FloatTransparentBlack,
-		IntTransparentBlack,
-		FloatOpaqueBlack,
-		IntOpaqueBlack,
-		FloatOpaqueWhite,
-		IntOpaqueWhite
-	}
-
-	public enum Backend
-	{
-		DontCare,
-		Vulkan,
-		PS5,
-		Invalid
-	}
-}

src/Graphics/RefreshStructs.cs

@@ -1,357 +0,0 @@
-using RefreshCS;
-using System.Runtime.InteropServices;
-
-/* Recreate some structs in here so we don't need to explicitly
- * reference the RefreshCS namespace when using MoonWorks.Graphics
- */
-namespace MoonWorks.Graphics
-{
-	[StructLayout(LayoutKind.Sequential)]
-	public struct DepthStencilValue
-	{
-		public float Depth;
-		public uint Stencil;
-
-		public DepthStencilValue(float depth, uint stencil)
-		{
-			Depth = depth;
-			Stencil = stencil;
-		}
-
-		// FIXME: can we do an unsafe cast somehow?
-		public Refresh.DepthStencilValue ToRefresh()
-		{
-			return new Refresh.DepthStencilValue
-			{
-				depth = Depth,
-				stencil = Stencil
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct Rect
-	{
-		public int X;
-		public int Y;
-		public int W;
-		public int H;
-
-		public Rect(int x, int y, int w, int h)
-		{
-			X = x;
-			Y = y;
-			W = w;
-			H = h;
-		}
-
-		public Rect(int w, int h)
-		{
-			X = 0;
-			Y = 0;
-			W = w;
-			H = h;
-		}
-
-		// FIXME: can we do an unsafe cast somehow?
-		public Refresh.Rect ToRefresh()
-		{
-			return new Refresh.Rect
-			{
-				x = X,
-				y = Y,
-				w = W,
-				h = H
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct Viewport
-	{
-		public float X;
-		public float Y;
-		public float W;
-		public float H;
-		public float MinDepth;
-		public float MaxDepth;
-
-		public Viewport(float w, float h)
-		{
-			X = 0;
-			Y = 0;
-			W = w;
-			H = h;
-			MinDepth = 0;
-			MaxDepth = 1;
-		}
-
-		public Viewport(float x, float y, float w, float h)
-		{
-			X = x;
-			Y = y;
-			W = w;
-			H = h;
-			MinDepth = 0;
-			MaxDepth = 1;
-		}
-
-		public Viewport(float x, float y, float w, float h, float minDepth, float maxDepth)
-		{
-			X = x;
-			Y = y;
-			W = w;
-			H = h;
-			MinDepth = minDepth;
-			MaxDepth = maxDepth;
-		}
-
-		public Refresh.Viewport ToRefresh()
-		{
-			return new Refresh.Viewport
-			{
-				x = X,
-				y = Y,
-				w = W,
-				h = H,
-				minDepth = MinDepth,
-				maxDepth = MaxDepth
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct VertexBinding
-	{
-		public uint Binding;
-		public uint Stride;
-		public VertexInputRate InputRate;
-
-		public static VertexBinding Create<T>(uint binding = 0, VertexInputRate inputRate = VertexInputRate.Vertex) where T : unmanaged
-		{
-			return new VertexBinding
-			{
-				Binding = binding,
-				InputRate = inputRate,
-				Stride = (uint) Marshal.SizeOf<T>()
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct VertexAttribute
-	{
-		public uint Location;
-		public uint Binding;
-		public VertexElementFormat Format;
-		public uint Offset;
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct StencilOpState
-	{
-		public StencilOp FailOp;
-		public StencilOp PassOp;
-		public StencilOp DepthFailOp;
-		public CompareOp CompareOp;
-		public uint CompareMask;
-		public uint WriteMask;
-		public uint Reference;
-
-		// FIXME: can we do an explicit cast here?
-		public Refresh.StencilOpState ToRefresh()
-		{
-			return new Refresh.StencilOpState
-			{
-				failOp = (Refresh.StencilOp) FailOp,
-				passOp = (Refresh.StencilOp) PassOp,
-				depthFailOp = (Refresh.StencilOp) DepthFailOp,
-				compareOp = (Refresh.CompareOp) CompareOp,
-				compareMask = CompareMask,
-				writeMask = WriteMask,
-				reference = Reference
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct ColorAttachmentInfo
-	{
-		public Texture Texture;
-		public uint Depth;
-		public uint Layer;
-		public uint Level;
-		public Color ClearColor;
-		public LoadOp LoadOp;
-		public StoreOp StoreOp;
-
-		public ColorAttachmentInfo(
-			Texture texture,
-			Color clearColor,
-			StoreOp storeOp = StoreOp.Store
-		) {
-			Texture = texture;
-			Depth = 0;
-			Layer = 0;
-			Level = 0;
-			ClearColor = clearColor;
-			LoadOp = LoadOp.Clear;
-			StoreOp = storeOp;
-		}
-
-		public ColorAttachmentInfo(
-			Texture texture,
-			LoadOp loadOp = LoadOp.DontCare,
-			StoreOp storeOp = StoreOp.Store
-		) {
-			Texture = texture;
-			Depth = 0;
-			Layer = 0;
-			Level = 0;
-			ClearColor = Color.White;
-			LoadOp = loadOp;
-			StoreOp = storeOp;
-		}
-
-		public Refresh.ColorAttachmentInfo ToRefresh()
-		{
-			return new Refresh.ColorAttachmentInfo
-			{
-				texture = Texture.Handle,
-				depth = Depth,
-				layer = Layer,
-				level = Level,
-				clearColor = new Refresh.Vec4
-				{
-					x = ClearColor.R / 255f,
-					y = ClearColor.G / 255f,
-					z = ClearColor.B / 255f,
-					w = ClearColor.A / 255f
-				},
-				loadOp = (Refresh.LoadOp) LoadOp,
-				storeOp = (Refresh.StoreOp) StoreOp
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct DepthStencilAttachmentInfo
-	{
-		public Texture Texture;
-		public uint Depth;
-		public uint Layer;
-		public uint Level;
-		public DepthStencilValue DepthStencilClearValue;
-		public LoadOp LoadOp;
-		public StoreOp StoreOp;
-		public LoadOp StencilLoadOp;
-		public StoreOp StencilStoreOp;
-
-		public DepthStencilAttachmentInfo(
-			Texture texture,
-			DepthStencilValue clearValue,
-			StoreOp depthStoreOp = StoreOp.Store,
-			StoreOp stencilStoreOp = StoreOp.Store
-		)
-		{
-			Texture = texture;
-			Depth = 0;
-			Layer = 0;
-			Level = 0;
-			DepthStencilClearValue = clearValue;
-			LoadOp = LoadOp.Clear;
-			StoreOp = depthStoreOp;
-			StencilLoadOp = LoadOp.Clear;
-			StencilStoreOp = stencilStoreOp;
-		}
-
-		public DepthStencilAttachmentInfo(
-			Texture texture,
-			LoadOp loadOp = LoadOp.DontCare,
-			StoreOp storeOp = StoreOp.Store,
-			LoadOp stencilLoadOp = LoadOp.DontCare,
-			StoreOp stencilStoreOp = StoreOp.Store
-		) {
-			Texture = texture;
-			Depth = 0;
-			Layer = 0;
-			Level = 0;
-			DepthStencilClearValue = new DepthStencilValue();
-			LoadOp = loadOp;
-			StoreOp = storeOp;
-			StencilLoadOp = stencilLoadOp;
-			StencilStoreOp = stencilStoreOp;
-		}
-
-		public DepthStencilAttachmentInfo(
-			Texture texture,
-			DepthStencilValue depthStencilValue,
-			LoadOp loadOp,
-			StoreOp storeOp,
-			LoadOp stencilLoadOp,
-			StoreOp stencilStoreOp
-		) {
-			Texture = texture;
-			Depth = 0;
-			Layer = 0;
-			Level = 0;
-			DepthStencilClearValue = depthStencilValue;
-			LoadOp = loadOp;
-			StoreOp = storeOp;
-			StencilLoadOp = stencilLoadOp;
-			StencilStoreOp = stencilStoreOp;
-		}
-
-		public Refresh.DepthStencilAttachmentInfo ToRefresh()
-		{
-			return new Refresh.DepthStencilAttachmentInfo
-			{
-				texture = Texture.Handle,
-				depth = Depth,
-				layer = Layer,
-				level = Level,
-				depthStencilClearValue = DepthStencilClearValue.ToRefresh(),
-				loadOp = (Refresh.LoadOp) LoadOp,
-				storeOp = (Refresh.StoreOp) StoreOp,
-				stencilLoadOp = (Refresh.LoadOp) StencilLoadOp,
-				stencilStoreOp = (Refresh.StoreOp) StencilStoreOp
-			};
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct ColorAttachmentDescription
-	{
-		public TextureFormat Format;
-		public ColorAttachmentBlendState BlendState;
-
-		public ColorAttachmentDescription(
-			TextureFormat format,
-			ColorAttachmentBlendState blendState
-		) {
-			Format = format;
-			BlendState = blendState;
-		}
-	}
-
-	[StructLayout(LayoutKind.Sequential)]
-	public struct IndirectDrawCommand
-	{
-		public uint VertexCount;
-		public uint InstanceCount;
-		public uint FirstVertex;
-		public uint FirstInstance;
-
-		public IndirectDrawCommand(
-			uint vertexCount,
-			uint instanceCount,
-			uint firstVertex,
-			uint firstInstance
-		) {
-			VertexCount = vertexCount;
-			InstanceCount = instanceCount;
-			FirstVertex = firstVertex;
-			FirstInstance = firstInstance;
-		}
-	}
-}

src/Graphics/RenderPass.cs

@@ -0,0 +1,559 @@
+using System;
+using System.Runtime.InteropServices;
+using SDL2_gpuCS;
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// Render passes are begun in command buffers and are used to apply render state and issue draw calls.
+/// Render passes are pooled and should not be referenced after calling EndRenderPass.
+/// </summary>
+public class RenderPass
+{
+	public nint Handle { get; private set; }
+
+#if DEBUG
+	internal bool active;
+	internal uint colorAttachmentCount;
+	internal SampleCount colorAttachmentSampleCount;
+	internal TextureFormat colorFormatOne;
+	internal TextureFormat colorFormatTwo;
+	internal TextureFormat colorFormatThree;
+	internal TextureFormat colorFormatFour;
+	internal bool hasDepthStencilAttachment;
+	internal SampleCount depthStencilAttachmentSampleCount;
+	internal TextureFormat depthStencilFormat;
+
+	GraphicsPipeline currentGraphicsPipeline;
+#endif
+
+	internal void SetHandle(nint handle)
+	{
+		Handle = handle;
+	}
+
+	/// <summary>
+	/// Binds a graphics pipeline so that rendering work may be performed.
+	/// </summary>
+	/// <param name="graphicsPipeline">The graphics pipeline to bind.</param>
+	public void BindGraphicsPipeline(
+		GraphicsPipeline graphicsPipeline
+	) {
+#if DEBUG
+		AssertRenderPassActive();
+		AssertRenderPassPipelineFormatMatch(graphicsPipeline);
+
+		if (colorAttachmentCount > 0)
+		{
+			if (graphicsPipeline.SampleCount != colorAttachmentSampleCount)
+			{
+				throw new System.InvalidOperationException($"Sample count mismatch! Graphics pipeline sample count: {graphicsPipeline.SampleCount}, Color attachment sample count: {colorAttachmentSampleCount}");
+			}
+		}
+
+		if (hasDepthStencilAttachment)
+		{
+			if (graphicsPipeline.SampleCount != depthStencilAttachmentSampleCount)
+			{
+				throw new System.InvalidOperationException($"Sample count mismatch! Graphics pipeline sample count: {graphicsPipeline.SampleCount}, Depth stencil attachment sample count: {depthStencilAttachmentSampleCount}");
+			}
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuBindGraphicsPipeline(
+			Handle,
+			graphicsPipeline.Handle
+		);
+
+#if DEBUG
+		currentGraphicsPipeline = graphicsPipeline;
+#endif
+	}
+
+	/// <summary>
+	/// Sets the viewport.
+	/// </summary>
+	public void SetViewport(in Viewport viewport)
+	{
+#if DEBUG
+		AssertRenderPassActive();
+#endif
+
+		SDL_Gpu.SDL_GpuSetViewport(
+			Handle,
+			viewport.ToSDL()
+		);
+	}
+
+	/// <summary>
+	/// Sets the scissor area.
+	/// </summary>
+	public void SetScissor(in Rect scissor)
+	{
+#if DEBUG
+		AssertRenderPassActive();
+
+		if (scissor.X < 0 || scissor.Y < 0 || scissor.W <= 0 || scissor.H <= 0)
+		{
+			throw new System.ArgumentOutOfRangeException("Scissor position cannot be negative and dimensions must be positive!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuSetScissor(
+			Handle,
+			scissor.ToSDL()
+		);
+	}
+
+	/// <summary>
+	/// Binds vertex buffers to be used by subsequent draw calls.
+	/// </summary>
+	/// <param name="bufferBinding">Buffer to bind and associated offset.</param>
+	/// <param name="firstBinding">The index of the first vertex input binding whose state is updated by the command.</param>
+	public unsafe void BindVertexBuffer(
+		in BufferBinding bufferBinding,
+		uint firstBinding = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		var sdlBufferBinding = bufferBinding.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindVertexBuffers(
+			Handle,
+			firstBinding,
+			&sdlBufferBinding,
+			1
+		);
+	}
+
+	/// <summary>
+	/// Binds an index buffer to be used by subsequent draw calls.
+	/// </summary>
+	/// <param name="indexBuffer">The index buffer to bind.</param>
+	/// <param name="indexElementSize">The size in bytes of the index buffer elements.</param>
+	/// <param name="offset">The offset index for the buffer.</param>
+	public void BindIndexBuffer(
+		BufferBinding bufferBinding,
+		IndexElementSize indexElementSize
+	)
+	{
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		SDL_Gpu.SDL_GpuBindIndexBuffer(
+			Handle,
+			bufferBinding.ToSDL(),
+			(SDL_Gpu.IndexElementSize) indexElementSize
+		);
+	}
+
+	/// <summary>
+	/// Binds samplers to be used by the vertex shader.
+	/// </summary>
+	/// <param name="textureSamplerBindings">The texture-sampler to bind.</param>
+	public unsafe void BindVertexSampler(
+		in TextureSamplerBinding textureSamplerBinding,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertTextureSamplerBindingNonNull(textureSamplerBinding);
+		AssertTextureHasSamplerFlag(textureSamplerBinding.Texture);
+#endif
+
+		var sdlTextureSamplerBinding = textureSamplerBinding.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindVertexSamplers(
+			Handle,
+			slot,
+			&sdlTextureSamplerBinding,
+			1
+		);
+	}
+
+	public unsafe void BindVertexStorageTexture(
+		in TextureSlice textureSlice,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertTextureNonNull(textureSlice.Texture);
+		AssertTextureHasGraphicsStorageFlag(textureSlice.Texture);
+#endif
+
+		var sdlTextureSlice = textureSlice.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindVertexStorageTextures(
+			Handle,
+			slot,
+			&sdlTextureSlice,
+			1
+		);
+	}
+
+	public unsafe void BindVertexStorageBuffer(
+		GpuBuffer buffer,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertBufferNonNull(buffer);
+		AssertBufferHasGraphicsStorageFlag(buffer);
+#endif
+
+		var bufferHandle = buffer.Handle;
+
+		SDL_Gpu.SDL_GpuBindVertexStorageBuffers(
+			Handle,
+			slot,
+			&bufferHandle,
+			1
+		);
+	}
+
+	public unsafe void BindFragmentSamplers(
+		in TextureSamplerBinding textureSamplerBinding,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertTextureSamplerBindingNonNull(textureSamplerBinding);
+		AssertTextureHasSamplerFlag(textureSamplerBinding.Texture);
+#endif
+
+		var sdlTextureSamplerBinding = textureSamplerBinding.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindFragmentSamplers(
+			Handle,
+			slot,
+			&sdlTextureSamplerBinding,
+			1
+		);
+	}
+
+	public unsafe void BindFragmentStorageTexture(
+		in TextureSlice textureSlice,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertTextureNonNull(textureSlice.Texture);
+		AssertTextureHasGraphicsStorageFlag(textureSlice.Texture);
+#endif
+
+		var sdlTextureSlice = textureSlice.ToSDL();
+
+		SDL_Gpu.SDL_GpuBindFragmentStorageTextures(
+			Handle,
+			slot,
+			&sdlTextureSlice,
+			1
+		);
+	}
+
+	public unsafe void BindFragmentStorageBuffer(
+		GpuBuffer buffer,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+		AssertBufferNonNull(buffer);
+		AssertBufferHasGraphicsStorageFlag(buffer);
+#endif
+
+		var bufferHandle = buffer.Handle;
+
+		SDL_Gpu.SDL_GpuBindFragmentStorageBuffers(
+			Handle,
+			slot,
+			&bufferHandle,
+			1
+		);
+	}
+
+	public unsafe void PushVertexUniformData(
+		void* uniformsPtr,
+		uint size,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+
+		if (slot >= currentGraphicsPipeline.VertexShaderResourceInfo.UniformBufferCount)
+		{
+			throw new System.ArgumentException($"Slot {slot} given, but {currentGraphicsPipeline.VertexShaderResourceInfo.UniformBufferCount} uniform buffers are used on the shader!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuPushVertexUniformData(
+			Handle,
+			slot,
+			(nint) uniformsPtr,
+			size
+		);
+	}
+
+	public unsafe void PushVertexUniformData<T>(
+		in T uniforms,
+		uint slot = 0
+	) where T : unmanaged
+	{
+		fixed (T* uniformsPtr = &uniforms)
+		{
+			PushVertexUniformData(uniformsPtr, (uint) Marshal.SizeOf<T>(), slot);
+		}
+	}
+
+	public unsafe void PushFragmentUniformData(
+		void* uniformsPtr,
+		uint size,
+		uint slot = 0
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+
+		if (slot >= currentGraphicsPipeline.FragmentShaderResourceInfo.UniformBufferCount)
+		{
+			throw new System.ArgumentException($"Slot {slot} given, but {currentGraphicsPipeline.FragmentShaderResourceInfo.UniformBufferCount} uniform buffers are used on the shader!");
+		}
+#endif
+
+		SDL_Gpu.SDL_GpuPushFragmentUniformData(
+			Handle,
+			slot,
+			(nint) uniformsPtr,
+			size
+		);
+	}
+
+	public unsafe void PushFragmentUniformData<T>(
+		in T uniforms,
+		uint slot = 0
+	) where T : unmanaged
+	{
+		fixed (T* uniformsPtr = &uniforms)
+		{
+			PushFragmentUniformData(uniformsPtr, (uint) Marshal.SizeOf<T>(), slot);
+		}
+	}
+
+	/// <summary>
+	/// Draws using a vertex buffer and an index buffer, and an optional instance count.
+	/// </summary>
+	/// <param name="baseVertex">The starting index offset for the vertex buffer.</param>
+	/// <param name="startIndex">The starting index offset for the index buffer.</param>
+	/// <param name="primitiveCount">The number of primitives to draw.</param>
+	/// <param name="instanceCount">The number of instances to draw.</param>
+	public void DrawIndexedPrimitives(
+		uint baseVertex,
+		uint startIndex,
+		uint primitiveCount,
+		uint instanceCount = 1
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		SDL_Gpu.SDL_GpuDrawIndexedPrimitives(
+			Handle,
+			baseVertex,
+			startIndex,
+			primitiveCount,
+			instanceCount
+		);
+	}
+
+	/// <summary>
+	/// Draws using a vertex buffer and an index buffer.
+	/// </summary>
+	/// <param name="baseVertex">The starting index offset for the vertex buffer.</param>
+	/// <param name="startIndex">The starting index offset for the index buffer.</param>
+	/// <param name="primitiveCount">The number of primitives to draw.</param>
+	public void DrawPrimitives(
+		uint vertexStart,
+		uint primitiveCount
+	)
+	{
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		SDL_Gpu.SDL_GpuDrawPrimitives(
+			Handle,
+			vertexStart,
+			primitiveCount
+		);
+	}
+
+	/// <summary>
+	/// Similar to DrawPrimitives, but parameters are set from a buffer.
+	/// The buffer must have the Indirect usage flag set.
+	/// </summary>
+	/// <param name="buffer">The draw parameters buffer.</param>
+	/// <param name="offsetInBytes">The offset to start reading from the draw parameters buffer.</param>
+	/// <param name="drawCount">The number of draw parameter sets that should be read from the buffer.</param>
+	/// <param name="stride">The byte stride between sets of draw parameters.</param>
+	public void DrawPrimitivesIndirect(
+		GpuBuffer buffer,
+		uint offsetInBytes,
+		uint drawCount,
+		uint stride
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		SDL_Gpu.SDL_GpuDrawPrimitivesIndirect(
+			Handle,
+			buffer.Handle,
+			offsetInBytes,
+			drawCount,
+			stride
+		);
+	}
+
+	/// <summary>
+	/// Similar to DrawIndexedPrimitives, but parameters are set from a buffer.
+	/// The buffer must have the Indirect usage flag set.
+	/// </summary>
+	/// <param name="buffer">The draw parameters buffer.</param>
+	/// <param name="offsetInBytes">The offset to start reading from the draw parameters buffer.</param>
+	/// <param name="drawCount">The number of draw parameter sets that should be read from the buffer.</param>
+	/// <param name="stride">The byte stride between sets of draw parameters.</param>
+	public void DrawIndexedPrimitivesIndirect(
+		GpuBuffer buffer,
+		uint offsetInBytes,
+		uint drawCount,
+		uint stride
+	) {
+#if DEBUG
+		AssertGraphicsPipelineBound();
+#endif
+
+		SDL_Gpu.SDL_GpuDrawIndexedPrimitivesIndirect(
+			Handle,
+			buffer.Handle,
+			offsetInBytes,
+			drawCount,
+			stride
+		);
+	}
+
+#if DEBUG
+	private void AssertRenderPassActive(string message = "Render pass is not active!")
+	{
+		if (!active)
+		{
+			throw new System.InvalidOperationException(message);
+		}
+	}
+
+	private void AssertRenderPassPipelineFormatMatch(GraphicsPipeline graphicsPipeline)
+	{
+		for (var i = 0; i < graphicsPipeline.AttachmentInfo.ColorAttachmentDescriptions.Length; i += 1)
+		{
+			TextureFormat format;
+			if (i == 0)
+			{
+				format = colorFormatOne;
+			}
+			else if (i == 1)
+			{
+				format = colorFormatTwo;
+			}
+			else if (i == 2)
+			{
+				format = colorFormatThree;
+			}
+			else
+			{
+				format = colorFormatFour;
+			}
+
+			var pipelineFormat = graphicsPipeline.AttachmentInfo.ColorAttachmentDescriptions[i].Format;
+			if (pipelineFormat != format)
+			{
+				throw new System.InvalidOperationException($"Color texture format mismatch! Pipeline expects {pipelineFormat}, render pass attachment is {format}");
+			}
+		}
+
+		if (graphicsPipeline.AttachmentInfo.HasDepthStencilAttachment)
+		{
+			var pipelineDepthFormat = graphicsPipeline.AttachmentInfo.DepthStencilFormat;
+
+			if (!hasDepthStencilAttachment)
+			{
+				throw new System.InvalidOperationException("Pipeline expects depth attachment!");
+			}
+
+			if (pipelineDepthFormat != depthStencilFormat)
+			{
+				throw new System.InvalidOperationException($"Depth texture format mismatch! Pipeline expects {pipelineDepthFormat}, render pass attachment is {depthStencilFormat}");
+			}
+		}
+	}
+
+	private void AssertGraphicsPipelineBound(string message = "No graphics pipeline is bound!")
+	{
+		if (currentGraphicsPipeline == null)
+		{
+			throw new System.InvalidOperationException(message);
+		}
+	}
+
+	private void AssertTextureNonNull(in TextureSlice textureSlice)
+	{
+		if (textureSlice.Texture == null)
+		{
+			throw new NullReferenceException("Texture must not be null!");
+		}
+	}
+
+	private void AssertTextureSamplerBindingNonNull(in TextureSamplerBinding binding)
+	{
+		if (binding.Texture == null || binding.Texture.Handle == IntPtr.Zero)
+		{
+			throw new NullReferenceException("Texture binding must not be null!");
+		}
+
+		if (binding.Sampler == null || binding.Sampler.Handle == IntPtr.Zero)
+		{
+			throw new NullReferenceException("Sampler binding must not be null!");
+		}
+	}
+
+	private void AssertTextureHasSamplerFlag(Texture texture)
+	{
+		if ((texture.UsageFlags & TextureUsageFlags.Sampler) == 0)
+		{
+			throw new System.ArgumentException("The bound Texture's UsageFlags must include TextureUsageFlags.Sampler!");
+		}
+	}
+
+	private void AssertTextureHasGraphicsStorageFlag(Texture texture)
+	{
+		if ((texture.UsageFlags & TextureUsageFlags.GraphicsStorage) == 0)
+		{
+			throw new System.ArgumentException("The bound Texture's UsageFlags must include TextureUsageFlags.GraphicsStorage!");
+		}
+	}
+
+	private void AssertBufferNonNull(GpuBuffer buffer)
+	{
+		if (buffer == null || buffer.Handle == IntPtr.Zero)
+		{
+			throw new System.NullReferenceException("Buffer must not be null!");
+		}
+	}
+
+	private void AssertBufferHasGraphicsStorageFlag(GpuBuffer buffer)
+	{
+		if ((buffer.UsageFlags & BufferUsageFlags.GraphicsStorage) == 0)
+		{
+			throw new System.ArgumentException("The bound Buffer's UsageFlags must include BufferUsageFlag.GraphicsStorage!");
+		}
+	}
+#endif
+}

src/Graphics/RenderPassPool.cs

@@ -0,0 +1,25 @@
+using System.Collections.Concurrent;
+
+namespace MoonWorks.Graphics;
+
+internal class RenderPassPool
+{
+	private ConcurrentQueue<RenderPass> RenderPasses = new ConcurrentQueue<RenderPass>();
+
+	public RenderPass Obtain()
+	{
+		if (RenderPasses.TryDequeue(out var renderPass))
+		{
+			return renderPass;
+		}
+		else
+		{
+			return new RenderPass();
+		}
+	}
+
+	public void Return(RenderPass renderPass)
+	{
+		RenderPasses.Enqueue(renderPass);
+	}
+}

src/Graphics/ResourceUploader.cs

@@ -0,0 +1,381 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace MoonWorks.Graphics
+{
+	/// <summary>
+	/// A convenience structure for creating resources and uploading their data.
+	///
+	/// Note that Upload or UploadAndWait must be called after the Create methods for the data to actually be uploaded.
+	///
+	/// Note that this structure does not magically keep memory usage down -
+	/// you may want to stagger uploads over multiple submissions to minimize memory usage.
+	/// </summary>
+	public unsafe class ResourceUploader : GraphicsResource
+	{
+		TransferBuffer BufferTransferBuffer;
+		TransferBuffer TextureTransferBuffer;
+
+		byte* bufferData;
+		uint bufferDataOffset = 0;
+		uint bufferDataSize = 1024;
+
+		byte* textureData;
+		uint textureDataOffset = 0;
+		uint textureDataSize = 1024;
+
+		List<(GpuBuffer, BufferCopy, bool)> BufferUploads = new List<(GpuBuffer, BufferCopy, bool)>();
+		List<(TextureRegion, uint, bool)> TextureUploads = new List<(TextureRegion, uint, bool)>();
+
+		public ResourceUploader(GraphicsDevice device) : base(device)
+		{
+			bufferData = (byte*) NativeMemory.Alloc(bufferDataSize);
+			textureData = (byte*) NativeMemory.Alloc(textureDataSize);
+		}
+
+		// Buffers
+
+		/// <summary>
+		/// Creates a GpuBuffer with data to be uploaded.
+		/// </summary>
+		public GpuBuffer CreateBuffer<T>(Span<T> data, BufferUsageFlags usageFlags) where T : unmanaged
+		{
+			var lengthInBytes = (uint) (Marshal.SizeOf<T>() * data.Length);
+			var gpuBuffer = new GpuBuffer(Device, usageFlags, lengthInBytes);
+
+			SetBufferData(gpuBuffer, 0, data, false);
+
+			return gpuBuffer;
+		}
+
+		/// <summary>
+		/// Prepares upload of data into a GpuBuffer.
+		/// </summary>
+		public void SetBufferData<T>(GpuBuffer buffer, uint bufferOffsetInElements, Span<T> data, bool cycle) where T : unmanaged
+		{
+			uint elementSize = (uint) Marshal.SizeOf<T>();
+			uint offsetInBytes = elementSize * bufferOffsetInElements;
+			uint lengthInBytes = (uint) (elementSize * data.Length);
+
+			uint resourceOffset;
+			fixed (void* spanPtr = data)
+			{
+				resourceOffset = CopyBufferData(spanPtr, lengthInBytes);
+			}
+
+			var bufferCopyParams = new BufferCopy(resourceOffset, offsetInBytes, lengthInBytes);
+			BufferUploads.Add((buffer, bufferCopyParams, cycle));
+		}
+
+		// Textures
+
+		public Texture CreateTexture2D<T>(Span<T> pixelData, uint width, uint height) where T : unmanaged
+		{
+			var texture = Texture.CreateTexture2D(Device, width, height, TextureFormat.R8G8B8A8, TextureUsageFlags.Sampler);
+			SetTextureData(texture, pixelData, false);
+			return texture;
+		}
+
+		/// <summary>
+		/// Creates a 2D Texture from compressed image data to be uploaded.
+		/// </summary>
+		public Texture CreateTexture2DFromCompressed(Span<byte> compressedImageData)
+		{
+			ImageUtils.ImageInfoFromBytes(compressedImageData, out var width, out var height, out var _);
+			var texture = Texture.CreateTexture2D(Device, width, height, TextureFormat.R8G8B8A8, TextureUsageFlags.Sampler);
+			SetTextureDataFromCompressed(texture, compressedImageData);
+			return texture;
+		}
+
+		/// <summary>
+		/// Creates a 2D Texture from a compressed image stream to be uploaded.
+		/// </summary>
+		public Texture CreateTexture2DFromCompressed(Stream compressedImageStream)
+		{
+			var length = compressedImageStream.Length;
+			var buffer = NativeMemory.Alloc((nuint) length);
+			var span = new Span<byte>(buffer, (int) length);
+			compressedImageStream.ReadExactly(span);
+
+			var texture = CreateTexture2DFromCompressed(span);
+
+			NativeMemory.Free(buffer);
+
+			return texture;
+		}
+
+		/// <summary>
+		/// Creates a 2D Texture from a compressed image file to be uploaded.
+		/// </summary>
+		public Texture CreateTexture2DFromCompressed(string compressedImageFilePath)
+		{
+			var fileStream = new FileStream(compressedImageFilePath, FileMode.Open, FileAccess.Read);
+			return CreateTexture2DFromCompressed(fileStream);
+		}
+
+		/// <summary>
+		/// Creates a texture from a DDS stream.
+		/// </summary>
+		public Texture CreateTextureFromDDS(Stream stream)
+		{
+			using var reader = new BinaryReader(stream);
+			Texture texture;
+			int faces;
+			ImageUtils.ParseDDS(reader, out var format, out var width, out var height, out var levels, out var isCube);
+
+			if (isCube)
+			{
+				texture = Texture.CreateTextureCube(Device, (uint) width, format, TextureUsageFlags.Sampler, (uint) levels);
+				faces = 6;
+			}
+			else
+			{
+				texture = Texture.CreateTexture2D(Device, (uint) width, (uint) height, format, TextureUsageFlags.Sampler, (uint) levels);
+				faces = 1;
+			}
+
+			for (int face = 0; face < faces; face += 1)
+			{
+				for (int level = 0; level < levels; level += 1)
+				{
+					var levelWidth = width >> level;
+					var levelHeight = height >> level;
+
+					var levelSize = ImageUtils.CalculateDDSLevelSize(levelWidth, levelHeight, format);
+					var byteBuffer = NativeMemory.Alloc((nuint) levelSize);
+					var byteSpan = new Span<byte>(byteBuffer, levelSize);
+					stream.ReadExactly(byteSpan);
+
+					var textureRegion = new TextureRegion
+					{
+						TextureSlice = new TextureSlice
+						{
+							Texture = texture,
+							Layer = (uint) face,
+							MipLevel = (uint) level
+						},
+						X = 0,
+						Y = 0,
+						Z = 0,
+						Width = (uint) levelWidth,
+						Height = (uint) levelHeight,
+						Depth = 1
+					};
+
+					SetTextureData(textureRegion, byteSpan, false);
+
+					NativeMemory.Free(byteBuffer);
+				}
+			}
+
+			return texture;
+		}
+
+		/// <summary>
+		/// Creates a texture from a DDS file.
+		/// </summary>
+		public Texture CreateTextureFromDDS(string path)
+		{
+			var stream = new FileStream(path, FileMode.Open, FileAccess.Read);
+			return CreateTextureFromDDS(stream);
+		}
+
+		public void SetTextureDataFromCompressed(TextureRegion textureRegion, Span<byte> compressedImageData)
+		{
+			var pixelData = ImageUtils.GetPixelDataFromBytes(compressedImageData, out var _, out var _, out var sizeInBytes);
+			var pixelSpan = new Span<byte>((void*) pixelData, (int) sizeInBytes);
+
+			SetTextureData(textureRegion, pixelSpan, false);
+
+			ImageUtils.FreePixelData(pixelData);
+		}
+
+		public void SetTextureDataFromCompressed(TextureRegion textureRegion, Stream compressedImageStream)
+		{
+			var length = compressedImageStream.Length;
+			var buffer = NativeMemory.Alloc((nuint) length);
+			var span = new Span<byte>(buffer, (int) length);
+			compressedImageStream.ReadExactly(span);
+			SetTextureDataFromCompressed(textureRegion, span);
+			NativeMemory.Free(buffer);
+		}
+
+		public void SetTextureDataFromCompressed(TextureRegion textureRegion, string compressedImageFilePath)
+		{
+			var fileStream = new FileStream(compressedImageFilePath, FileMode.Open, FileAccess.Read);
+			SetTextureDataFromCompressed(textureRegion, fileStream);
+		}
+
+		/// <summary>
+		/// Prepares upload of pixel data into a TextureSlice.
+		/// </summary>
+		public void SetTextureData<T>(TextureRegion textureRegion, Span<T> data, bool cycle) where T : unmanaged
+		{
+			var elementSize = Marshal.SizeOf<T>();
+			var dataLengthInBytes = (uint) (elementSize * data.Length);
+
+			uint resourceOffset;
+			fixed (T* dataPtr = data)
+			{
+				resourceOffset = CopyTextureData(dataPtr, dataLengthInBytes, Texture.BytesPerPixel(textureRegion.TextureSlice.Texture.Format));
+			}
+
+			TextureUploads.Add((textureRegion, resourceOffset, cycle));
+		}
+
+		// Upload
+
+		/// <summary>
+		/// Uploads all the data corresponding to the created resources.
+		/// </summary>
+		public void Upload()
+		{
+			CopyToTransferBuffer();
+
+			var commandBuffer = Device.AcquireCommandBuffer();
+			RecordUploadCommands(commandBuffer);
+			Device.Submit(commandBuffer);
+		}
+
+		/// <summary>
+		/// Uploads and then blocks until the upload is finished.
+		/// This is useful for keeping memory usage down during threaded upload.
+		/// </summary>
+		public void UploadAndWait()
+		{
+			CopyToTransferBuffer();
+
+			var commandBuffer = Device.AcquireCommandBuffer();
+			RecordUploadCommands(commandBuffer);
+			var fence = Device.SubmitAndAcquireFence(commandBuffer);
+			Device.WaitForFences(fence);
+			Device.ReleaseFence(fence);
+		}
+
+		// Helper methods
+
+		private void CopyToTransferBuffer()
+		{
+			if (BufferUploads.Count > 0)
+			{
+				if (BufferTransferBuffer == null || BufferTransferBuffer.Size < bufferDataSize)
+				{
+					BufferTransferBuffer?.Dispose();
+					BufferTransferBuffer = new TransferBuffer(Device, TransferUsage.Buffer, TransferBufferMapFlags.Write, bufferDataSize);
+				}
+
+				var dataSpan = new Span<byte>(bufferData, (int) bufferDataSize);
+				BufferTransferBuffer.SetData(dataSpan, true);
+			}
+
+
+			if (TextureUploads.Count > 0)
+			{
+				if (TextureTransferBuffer == null || TextureTransferBuffer.Size < textureDataSize)
+				{
+					TextureTransferBuffer?.Dispose();
+					TextureTransferBuffer = new TransferBuffer(Device, TransferUsage.Texture, TransferBufferMapFlags.Write, textureDataSize);
+				}
+
+				var dataSpan = new Span<byte>(textureData, (int) textureDataSize);
+				TextureTransferBuffer.SetData(dataSpan, true);
+			}
+		}
+
+		private void RecordUploadCommands(CommandBuffer commandBuffer)
+		{
+			var copyPass = commandBuffer.BeginCopyPass();
+
+			foreach (var (gpuBuffer, bufferCopyParams, option) in BufferUploads)
+			{
+				copyPass.UploadToBuffer(
+					BufferTransferBuffer,
+					gpuBuffer,
+					bufferCopyParams,
+					option
+				);
+			}
+
+			foreach (var (textureRegion, offset, option) in TextureUploads)
+			{
+				copyPass.UploadToTexture(
+					TextureTransferBuffer,
+					textureRegion,
+					new BufferImageCopy(
+						offset,
+						0,
+						0
+					),
+					option
+				);
+			}
+
+			commandBuffer.EndCopyPass(copyPass);
+
+			BufferUploads.Clear();
+			TextureUploads.Clear();
+			bufferDataOffset = 0;
+		}
+
+		private uint CopyBufferData(void* ptr, uint lengthInBytes)
+		{
+			if (bufferDataOffset + lengthInBytes >= bufferDataSize)
+			{
+				bufferDataSize = bufferDataOffset + lengthInBytes;
+				bufferData = (byte*) NativeMemory.Realloc(bufferData, bufferDataSize);
+			}
+
+			var resourceOffset = bufferDataOffset;
+
+			NativeMemory.Copy(ptr, bufferData + bufferDataOffset, lengthInBytes);
+			bufferDataOffset += lengthInBytes;
+
+			return resourceOffset;
+		}
+
+		private uint CopyTextureData(void* ptr, uint lengthInBytes, uint alignment)
+		{
+			textureDataOffset = RoundToAlignment(textureDataOffset, alignment);
+
+			if (textureDataOffset + lengthInBytes >= textureDataSize)
+			{
+				textureDataSize = textureDataOffset + lengthInBytes;
+				textureData = (byte*) NativeMemory.Realloc(textureData, textureDataSize);
+			}
+
+			var resourceOffset = textureDataOffset;
+
+			NativeMemory.Copy(ptr, textureData + textureDataOffset, lengthInBytes);
+			textureDataOffset += lengthInBytes;
+
+			return resourceOffset;
+		}
+
+		private uint RoundToAlignment(uint value, uint alignment)
+		{
+			return alignment * ((value + alignment - 1) / alignment);
+		}
+
+		// Dispose
+
+		/// <summary>
+		/// It is valid to immediately call Dispose after calling Upload.
+		/// </summary>
+		protected override void Dispose(bool disposing)
+		{
+			if (!IsDisposed)
+			{
+				if (disposing)
+				{
+					BufferTransferBuffer?.Dispose();
+					TextureTransferBuffer?.Dispose();
+				}
+
+				NativeMemory.Free(bufferData);
+			}
+			base.Dispose(disposing);
+		}
+	}
+}

src/Graphics/Resources/Buffer.cs

@@ -1,141 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-using RefreshCS;
-
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// Buffers are generic data containers that can be used by the GPU.
-	/// </summary>
-	public class Buffer : RefreshResource
-	{
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyBuffer;
-
-		/// <summary>
-		/// Size in bytes.
-		/// </summary>
-		public uint Size { get; }
-
-		/// <summary>
-		/// Creates a buffer of appropriate size given a type and element count.
-		/// </summary>
-		/// <typeparam name="T">The type that the buffer will contain.</typeparam>
-		/// <param name="device">The GraphicsDevice.</param>
-		/// <param name="usageFlags">Specifies how the buffer will be used.</param>
-		/// <param name="elementCount">How many elements of type T the buffer will contain.</param>
-		/// <returns></returns>
-		public unsafe static Buffer Create<T>(
-			GraphicsDevice device,
-			BufferUsageFlags usageFlags,
-			uint elementCount
-		) where T : unmanaged
-		{
-			return new Buffer(
-				device,
-				usageFlags,
-				(uint) Marshal.SizeOf<T>() * elementCount
-			);
-		}
-
-		/// <summary>
-		/// Creates a buffer.
-		/// </summary>
-		/// <param name="device">An initialized GraphicsDevice.</param>
-		/// <param name="usageFlags">Specifies how the buffer will be used.</param>
-		/// <param name="sizeInBytes">The length of the array. Cannot be resized.</param>
-		public Buffer(
-			GraphicsDevice device,
-			BufferUsageFlags usageFlags,
-			uint sizeInBytes
-		) : base(device)
-		{
-			Handle = Refresh.Refresh_CreateBuffer(
-				device.Handle,
-				(Refresh.BufferUsageFlags) usageFlags,
-				sizeInBytes
-			);
-			Size = sizeInBytes;
-		}
-
-		/// <summary>
-		/// Reads data out of a buffer and into a span.
-		/// This operation is only guaranteed to read up-to-date data if GraphicsDevice.Wait or GraphicsDevice.WaitForFences is called first.
-		/// </summary>
-		/// <param name="data">The span that data will be copied to.</param>
-		/// <param name="dataLengthInBytes">The length of the data to read.</param>
-		public unsafe void GetData<T>(
-			Span<T> data,
-			uint dataLengthInBytes
-		) where T : unmanaged
-		{
-#if DEBUG
-			if (dataLengthInBytes > Size)
-			{
-				Logger.LogWarn("Requested too many bytes from buffer!");
-			}
-
-			if (dataLengthInBytes > data.Length * Marshal.SizeOf<T>())
-			{
-				Logger.LogWarn("Data length is larger than the provided Span!");
-			}
-#endif
-
-			fixed (T* ptr = data)
-			{
-				Refresh.Refresh_GetBufferData(
-					Device.Handle,
-					Handle,
-					(IntPtr) ptr,
-					dataLengthInBytes
-				);
-			}
-		}
-
-		/// <summary>
-		/// Reads data out of a buffer and into an array.
-		/// This operation is only guaranteed to read up-to-date data if GraphicsDevice.Wait or GraphicsDevice.WaitForFences is called first.
-		/// </summary>
-		/// <param name="data">The span that data will be copied to.</param>
-		/// <param name="dataLengthInBytes">The length of the data to read.</param>
-		public unsafe void GetData<T>(
-			T[] data,
-			uint dataLengthInBytes
-		) where T : unmanaged
-		{
-			GetData(new Span<T>(data), dataLengthInBytes);
-		}
-
-		/// <summary>
-		/// Reads data out of a buffer and into a span.
-		/// This operation is only guaranteed to read up-to-date data if GraphicsDevice.Wait or GraphicsDevice.WaitForFences is called first.
-		/// Fills the span with as much data from the buffer as it can.
-		/// </summary>
-		/// <param name="data">The span that data will be copied to.</param>
-		public unsafe void GetData<T>(
-			Span<T> data
-		) where T : unmanaged
-		{
-			var lengthInBytes = System.Math.Min(data.Length * Marshal.SizeOf<T>(), Size);
-			GetData(data, (uint) lengthInBytes);
-		}
-
-		/// <summary>
-		/// Reads data out of a buffer and into an array.
-		/// This operation is only guaranteed to read up-to-date data if GraphicsDevice.Wait or GraphicsDevice.WaitForFences is called first.
-		/// Fills the array with as much data from the buffer as it can.
-		/// </summary>
-		/// <param name="data">The span that data will be copied to.</param>
-		public unsafe void GetData<T>(
-			T[] data
-		) where T : unmanaged
-		{
-			var lengthInBytes = System.Math.Min(data.Length * Marshal.SizeOf<T>(), Size);
-			GetData(new Span<T>(data), (uint) lengthInBytes);
-		}
-
-		public static implicit operator BufferBinding(Buffer b)
-		{
-			return new BufferBinding(b, 0);
-		}
-	}
-}

src/Graphics/Resources/ComputePipeline.cs

@@ -1,4 +1,4 @@
-using RefreshCS;
+using SDL2_gpuCS;
 using System;
 
 namespace MoonWorks.Graphics
@@ -6,36 +6,35 @@ namespace MoonWorks.Graphics
 	/// <summary>
 	/// Compute pipelines perform arbitrary parallel processing on input data.
 	/// </summary>
-	public class ComputePipeline : RefreshResource
+	public class ComputePipeline : SDL_GpuResource
 	{
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyComputePipeline;
+		protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseComputePipeline;
 
-		public ComputeShaderInfo ComputeShaderInfo { get; }
+		public ComputePipelineResourceInfo ResourceInfo { get; }
 
 		public unsafe ComputePipeline(
 			GraphicsDevice device,
-			ComputeShaderInfo computeShaderInfo
+			Shader computeShader,
+			ComputePipelineResourceInfo resourceInfo
 		) : base(device)
 		{
-			var refreshComputeShaderInfo = new Refresh.ComputeShaderInfo
+			var sdlComputePipelineCreateInfo = new SDL_Gpu.ComputePipelineCreateInfo
 			{
-				entryPointName = computeShaderInfo.EntryPointName,
+				ComputeShader = computeShader.Handle,
-				shaderModule = computeShaderInfo.ShaderModule.Handle,
+				PipelineResourceInfo = resourceInfo.ToSDL()
-				uniformBufferSize = computeShaderInfo.UniformBufferSize,
-				bufferBindingCount = computeShaderInfo.BufferBindingCount,
-				imageBindingCount = computeShaderInfo.ImageBindingCount
 			};
 
-			Handle = Refresh.Refresh_CreateComputePipeline(
+			Handle = SDL_Gpu.SDL_GpuCreateComputePipeline(
 				device.Handle,
-				refreshComputeShaderInfo
+				sdlComputePipelineCreateInfo
 			);
+
 			if (Handle == IntPtr.Zero)
 			{
 				throw new Exception("Could not create compute pipeline!");
 			}
 
-			ComputeShaderInfo = computeShaderInfo;
+			ResourceInfo = resourceInfo;
 		}
 	}
 }

src/Graphics/Resources/Fence.cs

@@ -1,18 +1,18 @@
 using System;
-using RefreshCS;
+using SDL2_gpuCS;
 
-namespace MoonWorks.Graphics
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// Fences allow you to track the status of a submitted command buffer. <br/>
+/// You should only acquire a Fence if you will need to track the command buffer. <br/>
+/// You should make sure to call GraphicsDevice.ReleaseFence when done with a Fence to avoid memory growth. <br/>
+/// The Fence object itself is basically just a wrapper for the Refresh_Fence. <br/>
+/// The internal handle is replaced so that we can pool Fence objects to manage garbage.
+/// </summary>
+public class Fence : SDL_GpuResource
 {
-	/// <summary>
+	protected override Action<nint, nint> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseFence;
-	/// Fences allow you to track the status of a submitted command buffer. <br/>
-	/// You should only acquire a Fence if you will need to track the command buffer. <br/>
-	/// You should make sure to call GraphicsDevice.ReleaseFence when done with a Fence to avoid memory growth. <br/>
-	/// The Fence object itself is basically just a wrapper for the Refresh_Fence. <br/>
-	/// The internal handle is replaced so that we can pool Fence objects to manage garbage.
-	/// </summary>
-	public class Fence : RefreshResource
-	{
-		protected override Action<nint, nint> QueueDestroyFunction => Refresh.Refresh_ReleaseFence;
 
 	internal Fence(GraphicsDevice device) : base(device)
 	{
@@ -22,5 +22,4 @@ namespace MoonWorks.Graphics
 	{
 		Handle = handle;
 	}
-	}
 }

src/Graphics/Resources/GpuBuffer.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Runtime.InteropServices;
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// GpuBuffers are generic data containers that can be used by the GPU.
+/// </summary>
+public class GpuBuffer : SDL_GpuResource
+{
+	protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseBuffer;
+
+	public BufferUsageFlags UsageFlags { get; }
+
+	/// <summary>
+	/// Size in bytes.
+	/// </summary>
+	public uint Size { get; }
+
+	private string name;
+	public string Name
+	{
+		get => name;
+
+		set
+		{
+			if (Device.DebugMode)
+			{
+				SDL_Gpu.SDL_GpuSetBufferName(
+					Device.Handle,
+					Handle,
+					value
+				);
+			}
+
+			name = value;
+		}
+	}
+
+	/// <summary>
+	/// Creates a buffer of appropriate size given a type and element count.
+	/// </summary>
+	/// <typeparam name="T">The type that the buffer will contain.</typeparam>
+	/// <param name="device">The GraphicsDevice.</param>
+	/// <param name="usageFlags">Specifies how the buffer will be used.</param>
+	/// <param name="elementCount">How many elements of type T the buffer will contain.</param>
+	/// <returns></returns>
+	public unsafe static GpuBuffer Create<T>(
+		GraphicsDevice device,
+		BufferUsageFlags usageFlags,
+		uint elementCount
+	) where T : unmanaged
+	{
+		return new GpuBuffer(
+			device,
+			usageFlags,
+			(uint) Marshal.SizeOf<T>() * elementCount
+		);
+	}
+
+	/// <summary>
+	/// Creates a buffer.
+	/// </summary>
+	/// <param name="device">An initialized GraphicsDevice.</param>
+	/// <param name="usageFlags">Specifies how the buffer will be used.</param>
+	/// <param name="sizeInBytes">The length of the array. Cannot be resized.</param>
+	public GpuBuffer(
+		GraphicsDevice device,
+		BufferUsageFlags usageFlags,
+		uint sizeInBytes
+	) : base(device)
+	{
+		Handle = SDL_Gpu.SDL_GpuCreateBuffer(
+			device.Handle,
+			(SDL_Gpu.BufferUsageFlags) usageFlags,
+			sizeInBytes
+		);
+		UsageFlags = usageFlags;
+		Size = sizeInBytes;
+		name = "";
+	}
+
+	public static implicit operator BufferBinding(GpuBuffer b)
+	{
+		return new BufferBinding(b, 0);
+	}
+}

src/Graphics/Resources/GraphicsPipeline.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Runtime.InteropServices;
-using RefreshCS;
+using SDL2_gpuCS;
 
 namespace MoonWorks.Graphics
 {
@@ -8,12 +8,12 @@ namespace MoonWorks.Graphics
 	/// Graphics pipelines encapsulate all of the render state in a single object. <br/>
 	/// These pipelines are bound before draw calls are issued.
 	/// </summary>
-	public class GraphicsPipeline : RefreshResource
+	public class GraphicsPipeline : SDL_GpuResource
 	{
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyGraphicsPipeline;
+		protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseGraphicsPipeline;
 
-		public GraphicsShaderInfo VertexShaderInfo { get; }
+		public GraphicsPipelineResourceInfo VertexShaderResourceInfo { get; }
-		public GraphicsShaderInfo FragmentShaderInfo { get; }
+		public GraphicsPipelineResourceInfo FragmentShaderResourceInfo { get; }
 		public SampleCount SampleCount { get; }
 
 #if DEBUG
@@ -25,100 +25,78 @@ namespace MoonWorks.Graphics
 			in GraphicsPipelineCreateInfo graphicsPipelineCreateInfo
 		) : base(device)
 		{
-			DepthStencilState depthStencilState = graphicsPipelineCreateInfo.DepthStencilState;
+			SDL_Gpu.GraphicsPipelineCreateInfo sdlGraphicsPipelineCreateInfo;
-			GraphicsShaderInfo vertexShaderInfo = graphicsPipelineCreateInfo.VertexShaderInfo;
-			GraphicsShaderInfo fragmentShaderInfo = graphicsPipelineCreateInfo.FragmentShaderInfo;
-			MultisampleState multisampleState = graphicsPipelineCreateInfo.MultisampleState;
-			RasterizerState rasterizerState = graphicsPipelineCreateInfo.RasterizerState;
-			PrimitiveType primitiveType = graphicsPipelineCreateInfo.PrimitiveType;
-			VertexInputState vertexInputState = graphicsPipelineCreateInfo.VertexInputState;
-			GraphicsPipelineAttachmentInfo attachmentInfo = graphicsPipelineCreateInfo.AttachmentInfo;
-			BlendConstants blendConstants = graphicsPipelineCreateInfo.BlendConstants;
 
-			var vertexAttributesHandle = GCHandle.Alloc(
+			var vertexAttributes = (SDL_Gpu.VertexAttribute*) NativeMemory.Alloc(
-				vertexInputState.VertexAttributes,
+				(nuint) (graphicsPipelineCreateInfo.VertexInputState.VertexAttributes.Length * Marshal.SizeOf<SDL_Gpu.VertexAttribute>())
-				GCHandleType.Pinned
-			);
-			var vertexBindingsHandle = GCHandle.Alloc(
-				vertexInputState.VertexBindings,
-				GCHandleType.Pinned
 			);
 
-			var colorAttachmentDescriptions = stackalloc Refresh.ColorAttachmentDescription[
+			for (var i = 0; i < graphicsPipelineCreateInfo.VertexInputState.VertexAttributes.Length; i += 1)
-				(int) attachmentInfo.ColorAttachmentDescriptions.Length
-			];
-
-			for (var i = 0; i < attachmentInfo.ColorAttachmentDescriptions.Length; i += 1)
 			{
-				colorAttachmentDescriptions[i].format = (Refresh.TextureFormat) attachmentInfo.ColorAttachmentDescriptions[i].Format;
+				vertexAttributes[i] = graphicsPipelineCreateInfo.VertexInputState.VertexAttributes[i].ToSDL();
-				colorAttachmentDescriptions[i].blendState = attachmentInfo.ColorAttachmentDescriptions[i].BlendState.ToRefresh();
 			}
 
-			Refresh.GraphicsPipelineCreateInfo refreshGraphicsPipelineCreateInfo;
+			var vertexBindings = (SDL_Gpu.VertexBinding*) NativeMemory.Alloc(
+				(nuint) (graphicsPipelineCreateInfo.VertexInputState.VertexBindings.Length * Marshal.SizeOf<SDL_Gpu.VertexBinding>())
+			);
 
-			refreshGraphicsPipelineCreateInfo.blendConstants[0] = blendConstants.R;
+			for (var i = 0; i < graphicsPipelineCreateInfo.VertexInputState.VertexBindings.Length; i += 1)
-			refreshGraphicsPipelineCreateInfo.blendConstants[1] = blendConstants.G;
+			{
-			refreshGraphicsPipelineCreateInfo.blendConstants[2] = blendConstants.B;
+				vertexBindings[i] = graphicsPipelineCreateInfo.VertexInputState.VertexBindings[i].ToSDL();
-			refreshGraphicsPipelineCreateInfo.blendConstants[3] = blendConstants.A;
+			}
 
-			refreshGraphicsPipelineCreateInfo.depthStencilState.backStencilState = depthStencilState.BackStencilState.ToRefresh();
+			var colorAttachmentDescriptions = stackalloc SDL_Gpu.ColorAttachmentDescription[
-			refreshGraphicsPipelineCreateInfo.depthStencilState.compareOp = (Refresh.CompareOp) depthStencilState.CompareOp;
+				graphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions.Length
-			refreshGraphicsPipelineCreateInfo.depthStencilState.depthBoundsTestEnable = Conversions.BoolToByte(depthStencilState.DepthBoundsTestEnable);
+			];
-			refreshGraphicsPipelineCreateInfo.depthStencilState.depthTestEnable = Conversions.BoolToByte(depthStencilState.DepthTestEnable);
-			refreshGraphicsPipelineCreateInfo.depthStencilState.depthWriteEnable = Conversions.BoolToByte(depthStencilState.DepthWriteEnable);
-			refreshGraphicsPipelineCreateInfo.depthStencilState.frontStencilState = depthStencilState.FrontStencilState.ToRefresh();
-			refreshGraphicsPipelineCreateInfo.depthStencilState.maxDepthBounds = depthStencilState.MaxDepthBounds;
-			refreshGraphicsPipelineCreateInfo.depthStencilState.minDepthBounds = depthStencilState.MinDepthBounds;
-			refreshGraphicsPipelineCreateInfo.depthStencilState.stencilTestEnable = Conversions.BoolToByte(depthStencilState.StencilTestEnable);
 
-			refreshGraphicsPipelineCreateInfo.vertexShaderInfo.entryPointName = vertexShaderInfo.EntryPointName;
+			for (var i = 0; i < graphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions.Length; i += 1)
-			refreshGraphicsPipelineCreateInfo.vertexShaderInfo.shaderModule = vertexShaderInfo.ShaderModule.Handle;
+			{
-			refreshGraphicsPipelineCreateInfo.vertexShaderInfo.uniformBufferSize = vertexShaderInfo.UniformBufferSize;
+				colorAttachmentDescriptions[i].Format = (SDL_Gpu.TextureFormat) graphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions[i].Format;
-			refreshGraphicsPipelineCreateInfo.vertexShaderInfo.samplerBindingCount = vertexShaderInfo.SamplerBindingCount;
+				colorAttachmentDescriptions[i].BlendState = graphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions[i].BlendState.ToSDL();
+			}
 
-			refreshGraphicsPipelineCreateInfo.fragmentShaderInfo.entryPointName = fragmentShaderInfo.EntryPointName;
+			sdlGraphicsPipelineCreateInfo.VertexShader = graphicsPipelineCreateInfo.VertexShader.Handle;
-			refreshGraphicsPipelineCreateInfo.fragmentShaderInfo.shaderModule = fragmentShaderInfo.ShaderModule.Handle;
+			sdlGraphicsPipelineCreateInfo.FragmentShader = graphicsPipelineCreateInfo.FragmentShader.Handle;
-			refreshGraphicsPipelineCreateInfo.fragmentShaderInfo.uniformBufferSize = fragmentShaderInfo.UniformBufferSize;
-			refreshGraphicsPipelineCreateInfo.fragmentShaderInfo.samplerBindingCount = fragmentShaderInfo.SamplerBindingCount;
 
-			refreshGraphicsPipelineCreateInfo.multisampleState.multisampleCount = (Refresh.SampleCount) multisampleState.MultisampleCount;
+			sdlGraphicsPipelineCreateInfo.VertexInputState.VertexAttributes = vertexAttributes;
-			refreshGraphicsPipelineCreateInfo.multisampleState.sampleMask = multisampleState.SampleMask;
+			sdlGraphicsPipelineCreateInfo.VertexInputState.VertexAttributeCount = (uint) graphicsPipelineCreateInfo.VertexInputState.VertexAttributes.Length;
+			sdlGraphicsPipelineCreateInfo.VertexInputState.VertexBindings = vertexBindings;
+			sdlGraphicsPipelineCreateInfo.VertexInputState.VertexBindingCount = (uint) graphicsPipelineCreateInfo.VertexInputState.VertexBindings.Length;
 
-			refreshGraphicsPipelineCreateInfo.rasterizerState.cullMode = (Refresh.CullMode) rasterizerState.CullMode;
+			sdlGraphicsPipelineCreateInfo.PrimitiveType = (SDL_Gpu.PrimitiveType) graphicsPipelineCreateInfo.PrimitiveType;
-			refreshGraphicsPipelineCreateInfo.rasterizerState.depthBiasClamp = rasterizerState.DepthBiasClamp;
-			refreshGraphicsPipelineCreateInfo.rasterizerState.depthBiasConstantFactor = rasterizerState.DepthBiasConstantFactor;
-			refreshGraphicsPipelineCreateInfo.rasterizerState.depthBiasEnable = Conversions.BoolToByte(rasterizerState.DepthBiasEnable);
-			refreshGraphicsPipelineCreateInfo.rasterizerState.depthBiasSlopeFactor = rasterizerState.DepthBiasSlopeFactor;
-			refreshGraphicsPipelineCreateInfo.rasterizerState.fillMode = (Refresh.FillMode) rasterizerState.FillMode;
-			refreshGraphicsPipelineCreateInfo.rasterizerState.frontFace = (Refresh.FrontFace) rasterizerState.FrontFace;
 
-			refreshGraphicsPipelineCreateInfo.vertexInputState.vertexAttributes = vertexAttributesHandle.AddrOfPinnedObject();
+			sdlGraphicsPipelineCreateInfo.RasterizerState = graphicsPipelineCreateInfo.RasterizerState.ToSDL();
-			refreshGraphicsPipelineCreateInfo.vertexInputState.vertexAttributeCount = (uint) vertexInputState.VertexAttributes.Length;
+			sdlGraphicsPipelineCreateInfo.MultisampleState = graphicsPipelineCreateInfo.MultisampleState.ToSDL();
-			refreshGraphicsPipelineCreateInfo.vertexInputState.vertexBindings = vertexBindingsHandle.AddrOfPinnedObject();
+			sdlGraphicsPipelineCreateInfo.DepthStencilState = graphicsPipelineCreateInfo.DepthStencilState.ToSDL();
-			refreshGraphicsPipelineCreateInfo.vertexInputState.vertexBindingCount = (uint) vertexInputState.VertexBindings.Length;
 
-			refreshGraphicsPipelineCreateInfo.primitiveType = (Refresh.PrimitiveType) primitiveType;
+			sdlGraphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentCount = (uint) graphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions.Length;
+			sdlGraphicsPipelineCreateInfo.AttachmentInfo.ColorAttachmentDescriptions = colorAttachmentDescriptions;
+			sdlGraphicsPipelineCreateInfo.AttachmentInfo.DepthStencilFormat = (SDL_Gpu.TextureFormat) graphicsPipelineCreateInfo.AttachmentInfo.DepthStencilFormat;
+			sdlGraphicsPipelineCreateInfo.AttachmentInfo.HasDepthStencilAttachment = Conversions.BoolToInt(graphicsPipelineCreateInfo.AttachmentInfo.HasDepthStencilAttachment);
 
-			refreshGraphicsPipelineCreateInfo.attachmentInfo.colorAttachmentCount = (uint) attachmentInfo.ColorAttachmentDescriptions.Length;
+			sdlGraphicsPipelineCreateInfo.VertexResourceInfo = graphicsPipelineCreateInfo.VertexShaderResourceInfo.ToSDL();
-			refreshGraphicsPipelineCreateInfo.attachmentInfo.colorAttachmentDescriptions = (IntPtr) colorAttachmentDescriptions;
+			sdlGraphicsPipelineCreateInfo.FragmentResourceInfo = graphicsPipelineCreateInfo.FragmentShaderResourceInfo.ToSDL();
-			refreshGraphicsPipelineCreateInfo.attachmentInfo.depthStencilFormat = (Refresh.TextureFormat) attachmentInfo.DepthStencilFormat;
-			refreshGraphicsPipelineCreateInfo.attachmentInfo.hasDepthStencilAttachment = Conversions.BoolToByte(attachmentInfo.HasDepthStencilAttachment);
 
-			Handle = Refresh.Refresh_CreateGraphicsPipeline(device.Handle, refreshGraphicsPipelineCreateInfo);
+			sdlGraphicsPipelineCreateInfo.BlendConstants[0] = graphicsPipelineCreateInfo.BlendConstants.R;
+			sdlGraphicsPipelineCreateInfo.BlendConstants[1] = graphicsPipelineCreateInfo.BlendConstants.G;
+			sdlGraphicsPipelineCreateInfo.BlendConstants[2] = graphicsPipelineCreateInfo.BlendConstants.B;
+			sdlGraphicsPipelineCreateInfo.BlendConstants[3] = graphicsPipelineCreateInfo.BlendConstants.A;
+
+			Handle = SDL_Gpu.SDL_GpuCreateGraphicsPipeline(device.Handle, sdlGraphicsPipelineCreateInfo);
 			if (Handle == IntPtr.Zero)
 			{
 				throw new Exception("Could not create graphics pipeline!");
 			}
 
-			vertexAttributesHandle.Free();
+			NativeMemory.Free(vertexAttributes);
-			vertexBindingsHandle.Free();
+			NativeMemory.Free(vertexBindings);
 
-			VertexShaderInfo = vertexShaderInfo;
+			VertexShaderResourceInfo = graphicsPipelineCreateInfo.VertexShaderResourceInfo;
-			FragmentShaderInfo = fragmentShaderInfo;
+			FragmentShaderResourceInfo = graphicsPipelineCreateInfo.FragmentShaderResourceInfo;
-			SampleCount = multisampleState.MultisampleCount;
+			SampleCount = graphicsPipelineCreateInfo.MultisampleState.MultisampleCount;
 
 #if DEBUG
-			AttachmentInfo = attachmentInfo;
+			AttachmentInfo = graphicsPipelineCreateInfo.AttachmentInfo;
 #endif
 		}
 	}

src/Graphics/Resources/Sampler.cs

@@ -1,24 +1,23 @@
 using System;
-using RefreshCS;
+using SDL2_gpuCS;
 
-namespace MoonWorks.Graphics
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// A sampler specifies how a texture will be sampled in a shader.
+/// </summary>
+public class Sampler : SDL_GpuResource
 {
-	/// <summary>
+	protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseSampler;
-	/// A sampler specifies how a texture will be sampled in a shader.
-	/// </summary>
-	public class Sampler : RefreshResource
-	{
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroySampler;
 
 	public Sampler(
 		GraphicsDevice device,
 		in SamplerCreateInfo samplerCreateInfo
 	) : base(device)
 	{
-			Handle = Refresh.Refresh_CreateSampler(
+		Handle = SDL_Gpu.SDL_GpuCreateSampler(
 			device.Handle,
-				samplerCreateInfo.ToRefreshSamplerStateCreateInfo()
+			samplerCreateInfo.ToSDL()
 		);
 	}
-	}
 }

src/Graphics/Resources/Shader.cs

@@ -0,0 +1,65 @@
+using SDL2_gpuCS;
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace MoonWorks.Graphics
+{
+	/// <summary>
+	/// Shader modules expect input in Refresh bytecode format.
+	/// </summary>
+	public class Shader : SDL_GpuResource
+	{
+		protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseShader;
+
+		public unsafe Shader(
+			GraphicsDevice device,
+			string filePath,
+			string entryPointName,
+			ShaderStage shaderStage,
+			ShaderFormat shaderFormat
+		) : base(device)
+		{
+			using var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
+			Handle = CreateFromStream(device, stream, entryPointName, shaderStage, shaderFormat);
+		}
+
+		public unsafe Shader(
+			GraphicsDevice device,
+			Stream stream,
+			string entryPointName,
+			ShaderStage shaderStage,
+			ShaderFormat shaderFormat
+		) : base(device)
+		{
+			Handle = CreateFromStream(device, stream, entryPointName, shaderStage, shaderFormat);
+		}
+
+		private static unsafe IntPtr CreateFromStream(
+			GraphicsDevice device,
+			Stream stream,
+			string entryPointName,
+			ShaderStage shaderStage,
+			ShaderFormat shaderFormat
+		) {
+			var bytecodeBuffer = NativeMemory.Alloc((nuint) stream.Length);
+			var bytecodeSpan = new Span<byte>(bytecodeBuffer, (int) stream.Length);
+			stream.ReadExactly(bytecodeSpan);
+
+			SDL_Gpu.ShaderCreateInfo shaderCreateInfo;
+			shaderCreateInfo.CodeSize = (nuint) stream.Length;
+			shaderCreateInfo.Code = (byte*) bytecodeBuffer;
+			shaderCreateInfo.EntryPointName = entryPointName;
+			shaderCreateInfo.Stage = (SDL_Gpu.ShaderStage) shaderStage;
+			shaderCreateInfo.Format = (SDL_Gpu.ShaderFormat) shaderFormat;
+
+			var shaderModule = SDL_Gpu.SDL_GpuCreateShader(
+				device.Handle,
+				shaderCreateInfo
+			);
+
+			NativeMemory.Free(bytecodeBuffer);
+			return shaderModule;
+		}
+	}
+}

src/Graphics/Resources/ShaderModule.cs

@@ -1,42 +0,0 @@
-using RefreshCS;
-using System;
-using System.IO;
-using System.Runtime.InteropServices;
-
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// Shader modules expect input in Refresh bytecode format.
-	/// </summary>
-	public class ShaderModule : RefreshResource
-	{
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyShaderModule;
-
-		public unsafe ShaderModule(GraphicsDevice device, string filePath) : base(device)
-		{
-			using var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
-			Handle = CreateFromStream(device, stream);
-		}
-
-		public unsafe ShaderModule(GraphicsDevice device, Stream stream) : base(device)
-		{
-			Handle = CreateFromStream(device, stream);
-		}
-
-		private static unsafe IntPtr CreateFromStream(GraphicsDevice device, Stream stream)
-		{
-			var bytecodeBuffer = NativeMemory.Alloc((nuint) stream.Length);
-			var bytecodeSpan = new Span<byte>(bytecodeBuffer, (int) stream.Length);
-			stream.ReadExactly(bytecodeSpan);
-
-			Refresh.ShaderModuleCreateInfo shaderModuleCreateInfo;
-			shaderModuleCreateInfo.codeSize = (nuint) stream.Length;
-			shaderModuleCreateInfo.byteCode = (nint) bytecodeBuffer;
-
-			var shaderModule = Refresh.Refresh_CreateShaderModule(device.Handle, shaderModuleCreateInfo);
-
-			NativeMemory.Free(bytecodeBuffer);
-			return shaderModule;
-		}
-	}
-}

src/Graphics/Resources/Texture.cs

@@ -1,183 +1,47 @@
 using System;
 using System.IO;
-using System.Runtime.InteropServices;
+using SDL2_gpuCS;
-using RefreshCS;
 
 namespace MoonWorks.Graphics
 {
 	/// <summary>
 	/// A container for pixel data.
 	/// </summary>
-	public class Texture : RefreshResource
+	public class Texture : SDL_GpuResource
 	{
 		public uint Width { get; internal set; }
 		public uint Height { get; internal set; }
 		public uint Depth { get; }
 		public TextureFormat Format { get; internal set; }
 		public bool IsCube { get; }
+		public uint LayerCount { get; }
 		public uint LevelCount { get; }
 		public SampleCount SampleCount { get; }
 		public TextureUsageFlags UsageFlags { get; }
 		public uint Size { get; }
 
-		// FIXME: this allocates a delegate instance
+		private string name;
-		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyTexture;
+		public string Name
-
-		/// <summary>
-		/// Creates a 2D Texture using PNG or QOI data from raw byte data.
-		/// </summary>
-		public static unsafe Texture FromImageBytes(
-			GraphicsDevice device,
-			CommandBuffer commandBuffer,
-			Span<byte> data
-		) {
-			Texture texture;
-
-			fixed (byte *dataPtr = data)
 		{
-				var pixels = Refresh.Refresh_Image_Load((nint) dataPtr, data.Length, out var width, out var height, out var len);
+			get => name;
 
-				TextureCreateInfo textureCreateInfo = new TextureCreateInfo();
+			set
-				textureCreateInfo.Width = (uint) width;
-				textureCreateInfo.Height = (uint) height;
-				textureCreateInfo.Depth = 1;
-				textureCreateInfo.Format = TextureFormat.R8G8B8A8;
-				textureCreateInfo.IsCube = false;
-				textureCreateInfo.LevelCount = 1;
-				textureCreateInfo.SampleCount = SampleCount.One;
-				textureCreateInfo.UsageFlags = TextureUsageFlags.Sampler;
-
-				texture = new Texture(device, textureCreateInfo);
-				commandBuffer.SetTextureData(texture, pixels, (uint) len);
-
-				Refresh.Refresh_Image_Free(pixels);
-			}
-
-			return texture;
-		}
-
-		/// <summary>
-		/// Creates a 2D Texture using PNG or QOI data from a stream.
-		/// </summary>
-		public static unsafe Texture FromImageStream(
-			GraphicsDevice device,
-			CommandBuffer commandBuffer,
-			Stream stream
-		) {
-			var length = stream.Length;
-			var buffer = NativeMemory.Alloc((nuint) length);
-			var span = new Span<byte>(buffer, (int) length);
-			stream.ReadExactly(span);
-
-			var texture = FromImageBytes(device, commandBuffer, span);
-
-			NativeMemory.Free((void*) buffer);
-
-			return texture;
-		}
-
-		/// <summary>
-		/// Creates a 2D Texture using PNG or QOI data from a file.
-		/// </summary>
-		public static Texture FromImageFile(
-			GraphicsDevice device,
-			CommandBuffer commandBuffer,
-			string path
-		) {
-			var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
-			return FromImageStream(device, commandBuffer, fileStream);
-		}
-
-		public static unsafe void SetDataFromImageBytes(
-			CommandBuffer commandBuffer,
-			TextureSlice textureSlice,
-			Span<byte> data
-		) {
-			fixed (byte* ptr = data)
 			{
-				var pixels = Refresh.Refresh_Image_Load(
+				if (Device.DebugMode)
-					(nint) ptr,
+				{
-					(int) data.Length,
+					SDL_Gpu.SDL_GpuSetTextureName(
-					out var w,
+						Device.Handle,
-					out var h,
+						Handle,
-					out var len
+						value
 					);
+				}
 
-				commandBuffer.SetTextureData(textureSlice, pixels, (uint) len);
+				name = value;
-
-				Refresh.Refresh_Image_Free(pixels);
 			}
 		}
 
-		/// <summary>
+		// FIXME: this allocates a delegate instance
-		/// Sets data for a texture slice using PNG or QOI data from a stream.
+		protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseTexture;
-		/// </summary>
-		public static unsafe void SetDataFromImageStream(
-			CommandBuffer commandBuffer,
-			TextureSlice textureSlice,
-			Stream stream
-		) {
-			var length = stream.Length;
-			var buffer = NativeMemory.Alloc((nuint) length);
-			var span = new Span<byte>(buffer, (int) length);
-			stream.ReadExactly(span);
-
-			SetDataFromImageBytes(commandBuffer, textureSlice, span);
-
-			NativeMemory.Free((void*) buffer);
-		}
-
-		/// <summary>
-		/// Sets data for a texture slice using PNG or QOI data from a file.
-		/// </summary>
-		public static void SetDataFromImageFile(
-			CommandBuffer commandBuffer,
-			TextureSlice textureSlice,
-			string path
-		) {
-			var fileStream = new FileStream(path, FileMode.Open, FileAccess.Read);
-			SetDataFromImageStream(commandBuffer, textureSlice, fileStream);
-		}
-
-		public unsafe static Texture LoadDDS(GraphicsDevice graphicsDevice, CommandBuffer commandBuffer, System.IO.Stream stream)
-		{
-			using var reader = new BinaryReader(stream);
-			Texture texture;
-			int faces;
-			ParseDDS(reader, out var format, out var width, out var height, out var levels, out var isCube);
-
-			if (isCube)
-			{
-				texture = CreateTextureCube(graphicsDevice, (uint) width, format, TextureUsageFlags.Sampler, (uint) levels);
-				faces = 6;
-			}
-			else
-			{
-				texture = CreateTexture2D(graphicsDevice, (uint) width, (uint) height, format, TextureUsageFlags.Sampler, (uint) levels);
-				faces = 1;
-			}
-
-			for (int i = 0; i < faces; i += 1)
-			{
-				for (int j = 0; j < levels; j += 1)
-				{
-					var levelWidth = width >> j;
-					var levelHeight = height >> j;
-
-					var levelSize = CalculateDDSLevelSize(levelWidth, levelHeight, format);
-					var byteBuffer = NativeMemory.Alloc((nuint) levelSize);
-					var byteSpan = new Span<byte>(byteBuffer, levelSize);
-					stream.ReadExactly(byteSpan);
-
-					var textureSlice = new TextureSlice(texture, new Rect(0, 0, levelWidth, levelHeight), 0, (uint) i, (uint) j);
-					commandBuffer.SetTextureData(textureSlice, (nint) byteBuffer, (uint) levelSize);
-
-					NativeMemory.Free(byteBuffer);
-				}
-			}
-
-			return texture;
-		}
 
 		/// <summary>
 		/// Creates a 2D texture.
@@ -203,6 +67,7 @@ namespace MoonWorks.Graphics
 				Height = height,
 				Depth = 1,
 				IsCube = false,
+				LayerCount = 1,
 				LevelCount = levelCount,
 				SampleCount = sampleCount,
 				Format = format,
@@ -213,15 +78,43 @@ namespace MoonWorks.Graphics
 		}
 
 		/// <summary>
-		/// Creates a 3D texture.
+		/// Creates a 2D texture array.
 		/// </summary>
 		/// <param name="device">An initialized GraphicsDevice.</param>
 		/// <param name="width">The width of the texture.</param>
 		/// <param name="height">The height of the texture.</param>
-		/// <param name="depth">The depth of the texture.</param>
+		/// <param name="layerCount">The layer count of the texture.</param>
 		/// <param name="format">The format of the texture.</param>
 		/// <param name="usageFlags">Specifies how the texture will be used.</param>
 		/// <param name="levelCount">Specifies the number of mip levels.</param>
+		public static Texture CreateTexture2DArray(
+			GraphicsDevice device,
+			uint width,
+			uint height,
+			uint layerCount,
+			TextureFormat format,
+			TextureUsageFlags usageFlags,
+			uint levelCount = 1
+		) {
+			var textureCreateInfo = new TextureCreateInfo
+			{
+				Width = width,
+				Height = height,
+				Depth = 1,
+				IsCube = false,
+				LayerCount = layerCount,
+				LevelCount = levelCount,
+				Format = format,
+				UsageFlags = usageFlags
+			};
+
+			return new Texture(device, textureCreateInfo);
+		}
+
+		/// <summary>
+		/// Creates a 3D texture.
+		/// Note that the width, height and depth all form one slice and cannot be subdivided in a texture slice.
+		/// </summary>
 		public static Texture CreateTexture3D(
 			GraphicsDevice device,
 			uint width,
@@ -237,6 +130,7 @@ namespace MoonWorks.Graphics
 				Height = height,
 				Depth = depth,
 				IsCube = false,
+				LayerCount = 1,
 				LevelCount = levelCount,
 				Format = format,
 				UsageFlags = usageFlags
@@ -266,6 +160,7 @@ namespace MoonWorks.Graphics
 				Height = size,
 				Depth = 1,
 				IsCube = true,
+				LayerCount = 6,
 				LevelCount = levelCount,
 				Format = format,
 				UsageFlags = usageFlags
@@ -284,9 +179,9 @@ namespace MoonWorks.Graphics
 			in TextureCreateInfo textureCreateInfo
 		) : base(device)
 		{
-			Handle = Refresh.Refresh_CreateTexture(
+			Handle = SDL_Gpu.SDL_GpuCreateTexture(
 				device.Handle,
-				textureCreateInfo.ToRefreshTextureCreateInfo()
+				textureCreateInfo.ToSDL()
 			);
 
 			Format = textureCreateInfo.Format;
@@ -294,16 +189,15 @@ namespace MoonWorks.Graphics
 			Height = textureCreateInfo.Height;
 			Depth = textureCreateInfo.Depth;
 			IsCube = textureCreateInfo.IsCube;
+			LayerCount = textureCreateInfo.LayerCount;
 			LevelCount = textureCreateInfo.LevelCount;
 			SampleCount = textureCreateInfo.SampleCount;
 			UsageFlags = textureCreateInfo.UsageFlags;
 			Size = Width * Height * BytesPerPixel(Format) / BlockSizeSquared(Format);
+			name = "";
 		}
 
-		public static implicit operator TextureSlice(Texture t) => new TextureSlice(t);
+		// Used by Window. Swapchain texture handles are managed by the driver backend.
-
-		// Used by AcquireSwapchainTexture.
-		// Should not be tracked, because swapchain textures are managed by Vulkan.
 		internal Texture(
 			GraphicsDevice device,
 			TextureFormat format
@@ -322,333 +216,6 @@ namespace MoonWorks.Graphics
 			Size = Width * Height * BytesPerPixel(Format) / BlockSizeSquared(Format);
 		}
 
-		// DDS loading extension, based on MojoDDS
-		// Taken from https://github.com/FNA-XNA/FNA/blob/1e49f868f595f62bc6385db45949a03186a7cd7f/src/Graphics/Texture.cs#L194
-		private static void ParseDDS(
-			BinaryReader reader,
-			out TextureFormat format,
-			out int width,
-			out int height,
-			out int levels,
-			out bool isCube
-		) {
-			// A whole bunch of magic numbers, yay DDS!
-			const uint DDS_MAGIC = 0x20534444;
-			const uint DDS_HEADERSIZE = 124;
-			const uint DDS_PIXFMTSIZE = 32;
-			const uint DDSD_HEIGHT = 0x2;
-			const uint DDSD_WIDTH = 0x4;
-			const uint DDSD_PITCH = 0x8;
-			const uint DDSD_LINEARSIZE = 0x80000;
-			const uint DDSD_REQ = (
-				DDSD_HEIGHT | DDSD_WIDTH
-			);
-			const uint DDSCAPS_MIPMAP = 0x400000;
-			const uint DDSCAPS_TEXTURE = 0x1000;
-			const uint DDSCAPS2_CUBEMAP = 0x200;
-			const uint DDPF_FOURCC = 0x4;
-			const uint DDPF_RGB = 0x40;
-			const uint FOURCC_DXT1 = 0x31545844;
-			const uint FOURCC_DXT3 = 0x33545844;
-			const uint FOURCC_DXT5 = 0x35545844;
-			const uint FOURCC_DX10 = 0x30315844;
-			const uint pitchAndLinear = (
-				DDSD_PITCH | DDSD_LINEARSIZE
-			);
-
-			// File should start with 'DDS '
-			if (reader.ReadUInt32() != DDS_MAGIC)
-			{
-				throw new NotSupportedException("Not a DDS!");
-			}
-
-			// Texture info
-			uint size = reader.ReadUInt32();
-			if (size != DDS_HEADERSIZE)
-			{
-				throw new NotSupportedException("Invalid DDS header!");
-			}
-			uint flags = reader.ReadUInt32();
-			if ((flags & DDSD_REQ) != DDSD_REQ)
-			{
-				throw new NotSupportedException("Invalid DDS flags!");
-			}
-			if ((flags & pitchAndLinear) == pitchAndLinear)
-			{
-				throw new NotSupportedException("Invalid DDS flags!");
-			}
-			height = reader.ReadInt32();
-			width = reader.ReadInt32();
-			reader.ReadUInt32(); // dwPitchOrLinearSize, unused
-			reader.ReadUInt32(); // dwDepth, unused
-			levels = reader.ReadInt32();
-
-			// "Reserved"
-			reader.ReadBytes(4 * 11);
-
-			// Format info
-			uint formatSize = reader.ReadUInt32();
-			if (formatSize != DDS_PIXFMTSIZE)
-			{
-				throw new NotSupportedException("Bogus PIXFMTSIZE!");
-			}
-			uint formatFlags = reader.ReadUInt32();
-			uint formatFourCC = reader.ReadUInt32();
-			uint formatRGBBitCount = reader.ReadUInt32();
-			uint formatRBitMask = reader.ReadUInt32();
-			uint formatGBitMask = reader.ReadUInt32();
-			uint formatBBitMask = reader.ReadUInt32();
-			uint formatABitMask = reader.ReadUInt32();
-
-			// dwCaps "stuff"
-			uint caps = reader.ReadUInt32();
-			if ((caps & DDSCAPS_TEXTURE) == 0)
-			{
-				throw new NotSupportedException("Not a texture!");
-			}
-
-			isCube = false;
-
-			uint caps2 = reader.ReadUInt32();
-			if (caps2 != 0)
-			{
-				if ((caps2 & DDSCAPS2_CUBEMAP) == DDSCAPS2_CUBEMAP)
-				{
-					isCube = true;
-				}
-				else
-				{
-					throw new NotSupportedException("Invalid caps2!");
-				}
-			}
-
-			reader.ReadUInt32(); // dwCaps3, unused
-			reader.ReadUInt32(); // dwCaps4, unused
-
-			// "Reserved"
-			reader.ReadUInt32();
-
-			// Mipmap sanity check
-			if ((caps & DDSCAPS_MIPMAP) != DDSCAPS_MIPMAP)
-			{
-				levels = 1;
-			}
-
-			// Determine texture format
-			if ((formatFlags & DDPF_FOURCC) == DDPF_FOURCC)
-			{
-				switch (formatFourCC)
-				{
-					case 0x71: // D3DFMT_A16B16G16R16F
-						format = TextureFormat.R16G16B16A16_SFLOAT;
-						break;
-					case 0x74: // D3DFMT_A32B32G32R32F
-						format = TextureFormat.R32G32B32A32_SFLOAT;
-						break;
-					case FOURCC_DXT1:
-						format = TextureFormat.BC1;
-						break;
-					case FOURCC_DXT3:
-						format = TextureFormat.BC2;
-						break;
-					case FOURCC_DXT5:
-						format = TextureFormat.BC3;
-						break;
-					case FOURCC_DX10:
-						// If the fourCC is DX10, there is an extra header with additional format information.
-						uint dxgiFormat = reader.ReadUInt32();
-
-						// These values are taken from the DXGI_FORMAT enum.
-						switch (dxgiFormat)
-						{
-							case 2:
-								format = TextureFormat.R32G32B32A32_SFLOAT;
-								break;
-
-							case 10:
-								format = TextureFormat.R16G16B16A16_SFLOAT;
-								break;
-
-							case 71:
-								format = TextureFormat.BC1;
-								break;
-
-							case 74:
-								format = TextureFormat.BC2;
-								break;
-
-							case 77:
-								format = TextureFormat.BC3;
-								break;
-
-							case 98:
-								format = TextureFormat.BC7;
-								break;
-
-							default:
-								throw new NotSupportedException(
-									"Unsupported DDS texture format"
-								);
-						}
-
-						uint resourceDimension = reader.ReadUInt32();
-
-						// These values are taken from the D3D10_RESOURCE_DIMENSION enum.
-						switch (resourceDimension)
-						{
-							case 0: // Unknown
-							case 1: // Buffer
-								throw new NotSupportedException(
-									"Unsupported DDS texture format"
-								);
-							default:
-								break;
-						}
-
-						/*
-						 * This flag seemingly only indicates if the texture is a cube map.
-						 * This is already determined above. Cool!
-						 */
-						uint miscFlag = reader.ReadUInt32();
-
-						/*
-						 * Indicates the number of elements in the texture array.
-						 * We don't support texture arrays so just throw if it's greater than 1.
-						 */
-						uint arraySize = reader.ReadUInt32();
-
-						if (arraySize > 1)
-						{
-							throw new NotSupportedException(
-								"Unsupported DDS texture format"
-							);
-						}
-
-						reader.ReadUInt32(); // reserved
-
-						break;
-					default:
-						throw new NotSupportedException(
-							"Unsupported DDS texture format"
-						);
-				}
-			}
-			else if ((formatFlags & DDPF_RGB) == DDPF_RGB)
-			{
-				if (	formatRGBBitCount != 32 ||
-					formatRBitMask != 0x00FF0000 ||
-					formatGBitMask != 0x0000FF00 ||
-					formatBBitMask != 0x000000FF ||
-					formatABitMask != 0xFF000000	)
-				{
-					throw new NotSupportedException(
-						"Unsupported DDS texture format"
-					);
-				}
-
-				format = TextureFormat.B8G8R8A8;
-			}
-			else
-			{
-				throw new NotSupportedException(
-					"Unsupported DDS texture format"
-				);
-			}
-		}
-
-		private static int CalculateDDSLevelSize(
-			int width,
-			int height,
-			TextureFormat format
-		) {
-			if (format == TextureFormat.R8G8B8A8)
-			{
-				return (((width * 32) + 7) / 8) * height;
-			}
-			else if (format == TextureFormat.R16G16B16A16_SFLOAT)
-			{
-				return (((width * 64) + 7) / 8) * height;
-			}
-			else if (format == TextureFormat.R32G32B32A32_SFLOAT)
-			{
-				return (((width * 128) + 7) / 8) * height;
-			}
-			else
-			{
-				int blockSize = 16;
-				if (format == TextureFormat.BC1)
-				{
-					blockSize = 8;
-				}
-				width = System.Math.Max(width, 1);
-				height = System.Math.Max(height, 1);
-				return (
-					((width + 3) / 4) *
-					((height + 3) / 4) *
-					blockSize
-				);
-			}
-		}
-
-		/// <summary>
-		/// Asynchronously saves RGBA or BGRA pixel data to a file in PNG format. <br/>
-		/// Warning: this is expensive and will block to wait for data download from GPU! <br/>
-		/// You can avoid blocking by calling this method from a thread.
-		/// </summary>
-		public unsafe void SavePNG(string path)
-		{
-#if DEBUG
-			if (Format != TextureFormat.R8G8B8A8 && Format != TextureFormat.B8G8R8A8)
-			{
-				throw new ArgumentException("Texture format must be RGBA or BGRA!", "format");
-			}
-#endif
-
-			var buffer = new Buffer(Device, 0, Width * Height * 4); // this creates garbage... oh well
-
-			// immediately request the data copy
-			var commandBuffer = Device.AcquireCommandBuffer();
-			commandBuffer.CopyTextureToBuffer(this, buffer);
-			var fence = Device.SubmitAndAcquireFence(commandBuffer);
-
-			var byteCount = buffer.Size;
-
-			var pixelsPtr = NativeMemory.Alloc((nuint) byteCount);
-			var pixelsSpan = new Span<byte>(pixelsPtr, (int) byteCount);
-
-			Device.WaitForFences(fence); // make sure the data transfer is done...
-			Device.ReleaseFence(fence); // and then release the fence
-
-			buffer.GetData(pixelsSpan);
-
-			if (Format == TextureFormat.B8G8R8A8)
-			{
-				var rgbaPtr = NativeMemory.Alloc((nuint) byteCount);
-				var rgbaSpan = new Span<byte>(rgbaPtr, (int) byteCount);
-
-				for (var i = 0; i < byteCount; i += 4)
-				{
-					rgbaSpan[i] = pixelsSpan[i + 2];
-					rgbaSpan[i + 1] = pixelsSpan[i + 1];
-					rgbaSpan[i + 2] = pixelsSpan[i];
-					rgbaSpan[i + 3] = pixelsSpan[i + 3];
-				}
-
-				Refresh.Refresh_Image_SavePNG(path, (nint) rgbaPtr, (int) Width, (int) Height);
-
-				NativeMemory.Free((void*) rgbaPtr);
-			}
-			else
-			{
-				fixed (byte* ptr = pixelsSpan)
-				{
-					Refresh.Refresh_Image_SavePNG(path, (nint) ptr, (int) Width, (int) Height);
-				}
-			}
-
-			NativeMemory.Free(pixelsPtr);
-		}
-
 		public static uint BytesPerPixel(TextureFormat format)
 		{
 			switch (format)
@@ -663,10 +230,8 @@ namespace MoonWorks.Graphics
 				case TextureFormat.R8G8_SNORM:
 				case TextureFormat.R8G8_UINT:
 				case TextureFormat.R16_UINT:
-				case TextureFormat.D16:
+				case TextureFormat.D16_UNORM:
 					return 2;
-				case TextureFormat.D16S8:
-					return 3;
 				case TextureFormat.R8G8B8A8:
 				case TextureFormat.B8G8R8A8:
 				case TextureFormat.R32_SFLOAT:
@@ -676,9 +241,10 @@ namespace MoonWorks.Graphics
 				case TextureFormat.A2R10G10B10:
 				case TextureFormat.R8G8B8A8_UINT:
 				case TextureFormat.R16G16_UINT:
-				case TextureFormat.D32:
+				case TextureFormat.D24_UNORM_S8_UINT:
+				case TextureFormat.D32_SFLOAT:
 					return 4;
-				case TextureFormat.D32S8:
+				case TextureFormat.D32_SFLOAT_S8_UINT:
 					return 5;
 				case TextureFormat.R16G16B16A16_SFLOAT:
 				case TextureFormat.R16G16B16A16:
@@ -697,6 +263,21 @@ namespace MoonWorks.Graphics
 			}
 		}
 
+		public static uint TexelSize(TextureFormat format)
+		{
+			switch (format)
+			{
+				case TextureFormat.BC2:
+				case TextureFormat.BC3:
+				case TextureFormat.BC7:
+					return 16;
+				case TextureFormat.BC1:
+					return 8;
+				default:
+					return 1;
+			}
+		}
+
 		public static uint BlockSizeSquared(TextureFormat format)
 		{
 			switch (format)
@@ -729,15 +310,19 @@ namespace MoonWorks.Graphics
 				case TextureFormat.R16_UINT:
 				case TextureFormat.R16G16_UINT:
 				case TextureFormat.R16G16B16A16_UINT:
-				case TextureFormat.D16:
+				case TextureFormat.D16_UNORM:
-				case TextureFormat.D32:
+				case TextureFormat.D24_UNORM:
-				case TextureFormat.D16S8:
+				case TextureFormat.D24_UNORM_S8_UINT:
-				case TextureFormat.D32S8:
+				case TextureFormat.D32_SFLOAT:
+				case TextureFormat.D32_SFLOAT_S8_UINT:
 					return 1;
 				default:
 					Logger.LogError("Texture format not recognized!");
 					return 0;
 			}
 		}
+
+		public static implicit operator TextureSlice(Texture t) => new TextureSlice(t);
+		public static implicit operator TextureRegion(Texture t) => new TextureRegion(t);
 	}
 }

src/Graphics/Resources/TransferBuffer.cs

@@ -0,0 +1,161 @@
+using System;
+using System.Runtime.InteropServices;
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics
+{
+	public unsafe class TransferBuffer : SDL_GpuResource
+	{
+		protected override Action<IntPtr, IntPtr> ReleaseFunction => SDL_Gpu.SDL_GpuReleaseTransferBuffer;
+
+		/// <summary>
+		/// Size in bytes.
+		/// </summary>
+		public uint Size { get; }
+
+		/// <summary>
+		/// Creates a buffer of requested size given a type and element count.
+		/// </summary>
+		/// <typeparam name="T">The type that the buffer will contain.</typeparam>
+		/// <param name="device">The GraphicsDevice.</param>
+		/// <param name="elementCount">How many elements of type T the buffer will contain.</param>
+		/// <returns></returns>
+		public unsafe static TransferBuffer Create<T>(
+			GraphicsDevice device,
+			TransferUsage usage,
+			TransferBufferMapFlags mapFlags,
+			uint elementCount
+		) where T : unmanaged
+		{
+			return new TransferBuffer(
+				device,
+				usage,
+				mapFlags,
+				(uint) Marshal.SizeOf<T>() * elementCount
+			);
+		}
+
+		/// <summary>
+		/// Creates a TransferBuffer.
+		/// </summary>
+		/// <param name="device">An initialized GraphicsDevice.</param>
+		/// <param name="sizeInBytes">The length of the buffer. Cannot be resized.</param>
+		/// <param name="usage">Whether this will be used to upload buffers or textures.</param>
+		public TransferBuffer(
+			GraphicsDevice device,
+			TransferUsage usage,
+			TransferBufferMapFlags mapFlags,
+			uint sizeInBytes
+		) : base(device)
+		{
+			Handle = SDL_Gpu.SDL_GpuCreateTransferBuffer(
+				device.Handle,
+				(SDL_Gpu.TransferUsage) usage,
+				(SDL_Gpu.TransferBufferMapFlags) mapFlags,
+				sizeInBytes
+			);
+			Size = sizeInBytes;
+		}
+
+		/// <summary>
+		/// Immediately copies data from a Span to the TransferBuffer.
+		/// Returns the length of the copy in bytes.
+		///
+		/// If cycle is set to true and this TransferBuffer was used in an Upload command,
+		/// that command will still use the corret data at the cost of increased memory usage.
+		///
+		/// If cycle is set to false, the data will be overwritten immediately,
+		/// which could cause a data race.
+		/// </summary>
+		public unsafe uint SetData<T>(
+			Span<T> data,
+			uint bufferOffsetInBytes,
+			bool cycle
+		) where T : unmanaged
+		{
+			var elementSize = Marshal.SizeOf<T>();
+			var dataLengthInBytes = (uint) (elementSize * data.Length);
+
+#if DEBUG
+			AssertBufferBoundsCheck(Size, bufferOffsetInBytes, dataLengthInBytes);
+#endif
+
+			fixed (T* dataPtr = data)
+			{
+				SDL_Gpu.SDL_GpuSetTransferData(
+					Device.Handle,
+					(nint) dataPtr,
+					Handle,
+					new SDL_Gpu.BufferCopy
+					{
+						SourceOffset = 0,
+						DestinationOffset = bufferOffsetInBytes,
+						Size = dataLengthInBytes
+					},
+					Conversions.BoolToInt(cycle)
+				);
+			}
+
+			return dataLengthInBytes;
+		}
+
+		/// <summary>
+		/// Immediately copies data from a Span to the TransferBuffer.
+		/// Returns the length of the copy in bytes.
+		///
+		/// If cycle is set to true and this TransferBuffer was used in an Upload command,
+		/// that command will still use the corret data at the cost of increased memory usage.
+		///
+		/// If cycle is set to false, the data will be overwritten immediately,
+		/// which could cause a data race.
+		/// </summary>
+		public unsafe uint SetData<T>(
+			Span<T> data,
+			bool cycle
+		) where T : unmanaged
+		{
+			return SetData(data, 0, cycle);
+		}
+
+		/// <summary>
+		/// Immediately copies data from the TransferBuffer into a Span.
+		/// </summary>
+		public unsafe void GetData<T>(
+			Span<T> data,
+			uint bufferOffsetInBytes = 0
+		) where T : unmanaged
+		{
+			var elementSize = Marshal.SizeOf<T>();
+			var dataLengthInBytes = (uint) (elementSize * data.Length);
+
+#if DEBUG
+			AssertBufferBoundsCheck(Size, bufferOffsetInBytes, dataLengthInBytes);
+#endif
+
+			fixed (T* dataPtr = data)
+			{
+				SDL_Gpu.SDL_GpuGetTransferData(
+					Device.Handle,
+					Handle,
+					(nint) dataPtr,
+					new SDL_Gpu.BufferCopy
+					{
+						SourceOffset = bufferOffsetInBytes,
+						DestinationOffset = 0,
+						Size = dataLengthInBytes
+					}
+				);
+			}
+		}
+
+#if DEBUG
+		private void AssertBufferBoundsCheck(uint bufferLengthInBytes, uint offsetInBytes, uint copyLengthInBytes)
+		{
+			if (copyLengthInBytes > bufferLengthInBytes + offsetInBytes)
+			{
+				throw new InvalidOperationException($"Data overflow! Transfer buffer length {bufferLengthInBytes}, offset {offsetInBytes}, copy length {copyLengthInBytes}");
+			}
+		}
+#endif
+	}
+}

src/Graphics/SDL_GpuResource.cs

@@ -1,17 +1,16 @@
 using System;
-using System.Runtime.InteropServices;
 using System.Threading;
 
 namespace MoonWorks.Graphics;
 
-public abstract class RefreshResource : GraphicsResource
+public abstract class SDL_GpuResource : GraphicsResource
 {
 	public IntPtr Handle { get => handle; internal set => handle = value; }
 	private IntPtr handle;
 
-	protected abstract Action<IntPtr, IntPtr> QueueDestroyFunction { get; }
+	protected abstract Action<IntPtr, IntPtr> ReleaseFunction { get; }
 
-	protected RefreshResource(GraphicsDevice device) : base(device)
+	protected SDL_GpuResource(GraphicsDevice device) : base(device)
 	{
 	}
 
@@ -19,11 +18,11 @@ public abstract class RefreshResource : GraphicsResource
 	{
 		if (!IsDisposed)
 		{
-			// Atomically call destroy function in case this is called from the finalizer thread
+			// Atomically call release function in case this is called from the finalizer thread
 			var toDispose = Interlocked.Exchange(ref handle, IntPtr.Zero);
 			if (toDispose != IntPtr.Zero)
 			{
-				QueueDestroyFunction(Device.Handle, toDispose);
+				ReleaseFunction(Device.Handle, toDispose);
 			}
 		}
 		base.Dispose(disposing);

src/Graphics/SDL_GpuTypes.cs

@@ -0,0 +1,941 @@
+using System;
+using System.Runtime.InteropServices;
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics;
+
+// Recreate certain types in here so we can hide the SDL_GpuCS namespace
+
+public enum PrimitiveType
+{
+	PointList,
+	LineList,
+	LineStrip,
+	TriangleList,
+	TriangleStrip
+}
+
+public enum LoadOp
+{
+	Load,
+	Clear,
+	DontCare
+}
+
+public enum StoreOp
+{
+	Store,
+	DontCare
+}
+
+public enum IndexElementSize
+{
+	Sixteen,
+	ThirtyTwo
+}
+
+public enum TextureFormat
+{
+	/* Unsigned Normalized Float Color Formats */
+	R8G8B8A8,
+	B8G8R8A8,
+	R5G6B5,
+	A1R5G5B5,
+	B4G4R4A4,
+	A2R10G10B10,
+	A2B10G10R10,
+	R16G16,
+	R16G16B16A16,
+	R8,
+	A8,
+	/* Compressed Unsigned Normalized Float Color Formats */
+	BC1,
+	BC2,
+	BC3,
+	BC7,
+	/* Signed Normalized Float Color Formats  */
+	R8G8_SNORM,
+	R8G8B8A8_SNORM,
+	/* Signed Float Color Formats */
+	R16_SFLOAT,
+	R16G16_SFLOAT,
+	R16G16B16A16_SFLOAT,
+	R32_SFLOAT,
+	R32G32_SFLOAT,
+	R32G32B32A32_SFLOAT,
+	/* Unsigned Integer Color Formats */
+	R8_UINT,
+	R8G8_UINT,
+	R8G8B8A8_UINT,
+	R16_UINT,
+	R16G16_UINT,
+	R16G16B16A16_UINT,
+	/* SRGB Color Formats */
+	R8G8B8A8_SRGB,
+	B8G8R8A8_SRGB,
+	/* Compressed SRGB Color Formats */
+	BC3_SRGB,
+	BC7_SRGB,
+	/* Depth Formats */
+	D16_UNORM,
+	D24_UNORM,
+	D32_SFLOAT,
+	D24_UNORM_S8_UINT,
+	D32_SFLOAT_S8_UINT
+}
+
+[Flags]
+public enum TextureUsageFlags
+{
+	Sampler = 0x1,
+	ColorTarget = 0x2,
+	DepthStencil = 0x4,
+	GraphicsStorage = 0x8,
+	ComputeStorageRead = 0x20,
+	ComputeStorageWrite = 0x40
+}
+
+public enum TextureType
+{
+	TwoD,
+	ThreeD,
+	Cube
+}
+
+public enum SampleCount
+{
+	One,
+	Two,
+	Four,
+	Eight
+}
+
+public enum CubeMapFace
+{
+	PositiveX,
+	NegativeX,
+	PositiveY,
+	NegativeY,
+	PositiveZ,
+	NegativeZ
+}
+
+[Flags]
+public enum BufferUsageFlags
+{
+	Vertex = 0x1,
+	Index = 0x2,
+	Indirect = 0x4,
+	GraphicsStorage = 0x8,
+	ComputeStorageRead = 0x20,
+	ComputeStorageWrite = 0x40
+}
+
+[Flags]
+public enum TransferBufferMapFlags
+{
+	Read = 0x1,
+	Write = 0x2
+}
+
+public enum ShaderStage
+{
+	Vertex,
+	Fragment,
+	Compute
+}
+
+public enum ShaderFormat
+{
+	Invalid,
+	SPIRV,
+	DXBC,
+	DXIL,
+	MSL,
+	METALLIB,
+	SECRET
+}
+
+public enum VertexElementFormat
+{
+	Uint,
+	Float,
+	Vector2,
+	Vector3,
+	Vector4,
+	Color,
+	Byte4,
+	Short2,
+	Short4,
+	NormalizedShort2,
+	NormalizedShort4,
+	HalfVector2,
+	HalfVector4
+}
+
+public enum VertexInputRate
+{
+	Vertex,
+	Instance
+}
+
+public enum FillMode
+{
+	Fill,
+	Line
+}
+
+public enum CullMode
+{
+	None,
+	Front,
+	Back
+}
+
+public enum FrontFace
+{
+	CounterClockwise,
+	Clockwise
+}
+
+public enum CompareOp
+{
+	Never,
+	Less,
+	Equal,
+	LessOrEqual,
+	Greater,
+	NotEqual,
+	GreaterOrEqual,
+	Always
+}
+
+public enum StencilOp
+{
+	Keep,
+	Zero,
+	Replace,
+	IncrementAndClamp,
+	DecrementAndClamp,
+	Invert,
+	IncrementAndWrap,
+	DecrementAndWrap
+}
+
+public enum BlendOp
+{
+	Add,
+	Subtract,
+	ReverseSubtract,
+	Min,
+	Max
+}
+
+public enum BlendFactor
+{
+	Zero,
+	One,
+	SourceColor,
+	OneMinusSourceColor,
+	DestinationColor,
+	OneMinusDestinationColor,
+	SourceAlpha,
+	OneMinusSourceAlpha,
+	DestinationAlpha,
+	OneMinusDestinationAlpha,
+	ConstantColor,
+	OneMinusConstantColor,
+	SourceAlphaSaturate
+}
+
+[Flags]
+public enum ColorComponentFlags
+{
+	None = 0x0,
+	R = 0x1,
+	G = 0x2,
+	B = 0x4,
+	A = 0x8,
+	RGB = R | G | B,
+	RGBA = R | G| B | A
+}
+
+public enum Filter
+{
+	Nearest,
+	Linear
+}
+
+public enum SamplerMipmapMode
+{
+	Nearest,
+	Linear
+}
+
+public enum SamplerAddressMode
+{
+	Repeat,
+	MirroredRepeat,
+	ClampToEdge,
+	ClampToBorder
+}
+
+public enum BorderColor
+{
+	FloatTransparentBlack,
+	IntTransparentBlack,
+	FloatOpaqueBlack,
+	IntOpaqueBlack,
+	FloatOpaqueWhite,
+	IntOpaqueWhite
+}
+
+public enum TransferUsage
+{
+	Buffer,
+	Texture
+}
+
+public enum PresentMode
+{
+	VSync,
+	Immediate,
+	Mailbox
+}
+
+public enum SwapchainComposition
+{
+	SDR,
+	SDRLinear,
+	HDRExtendedLinear,
+	HDR10_ST2084
+}
+
+[Flags]
+public enum BackendFlags
+{
+	Invalid = 0x0,
+	Vulkan = 0x1,
+	D3D11 = 0x2,
+	Metal = 0x4,
+	All = Vulkan | D3D11 | Metal
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct DepthStencilValue
+{
+	public float Depth;
+	public uint Stencil;
+
+	public DepthStencilValue(float depth, uint stencil)
+	{
+		Depth = depth;
+		Stencil = stencil;
+	}
+
+	// FIXME: can we do an unsafe cast somehow?
+	public SDL_Gpu.DepthStencilValue ToSDL()
+	{
+		return new SDL_Gpu.DepthStencilValue
+		{
+			Depth = Depth,
+			Stencil = Stencil
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct Rect
+{
+	public int X;
+	public int Y;
+	public int W;
+	public int H;
+
+	public Rect(int x, int y, int w, int h)
+	{
+		X = x;
+		Y = y;
+		W = w;
+		H = h;
+	}
+
+	public Rect(int w, int h)
+	{
+		X = 0;
+		Y = 0;
+		W = w;
+		H = h;
+	}
+
+	// FIXME: can we do an unsafe cast somehow?
+	public SDL_Gpu.Rect ToSDL()
+	{
+		return new SDL_Gpu.Rect
+		{
+			X = X,
+			Y = Y,
+			W = W,
+			H = H
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct Viewport
+{
+	public float X;
+	public float Y;
+	public float W;
+	public float H;
+	public float MinDepth;
+	public float MaxDepth;
+
+	public Viewport(float w, float h)
+	{
+		X = 0;
+		Y = 0;
+		W = w;
+		H = h;
+		MinDepth = 0;
+		MaxDepth = 1;
+	}
+
+	public Viewport(float x, float y, float w, float h)
+	{
+		X = x;
+		Y = y;
+		W = w;
+		H = h;
+		MinDepth = 0;
+		MaxDepth = 1;
+	}
+
+	public Viewport(float x, float y, float w, float h, float minDepth, float maxDepth)
+	{
+		X = x;
+		Y = y;
+		W = w;
+		H = h;
+		MinDepth = minDepth;
+		MaxDepth = maxDepth;
+	}
+
+	public SDL_Gpu.Viewport ToSDL()
+	{
+		return new SDL_Gpu.Viewport
+		{
+			X = X,
+			Y = Y,
+			W = W,
+			H = H,
+			MinDepth = MinDepth,
+			MaxDepth = MaxDepth
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct VertexBinding
+{
+	public uint Binding;
+	public uint Stride;
+	public VertexInputRate InputRate;
+
+	public static VertexBinding Create<T>(uint binding = 0, VertexInputRate inputRate = VertexInputRate.Vertex) where T : unmanaged
+	{
+		return new VertexBinding
+		{
+			Binding = binding,
+			InputRate = inputRate,
+			Stride = (uint) Marshal.SizeOf<T>()
+		};
+	}
+
+	public SDL_Gpu.VertexBinding ToSDL()
+	{
+		return new SDL_Gpu.VertexBinding
+		{
+			Binding = Binding,
+			Stride = Stride,
+			InputRate = (SDL_Gpu.VertexInputRate) InputRate
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct VertexAttribute
+{
+	public uint Location;
+	public uint Binding;
+	public VertexElementFormat Format;
+	public uint Offset;
+
+	public SDL_Gpu.VertexAttribute ToSDL()
+	{
+		return new SDL_Gpu.VertexAttribute
+		{
+			Location = Location,
+			Binding = Binding,
+			Format = (SDL_Gpu.VertexElementFormat) Format,
+			Offset = Offset
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct StencilOpState
+{
+	public StencilOp FailOp;
+	public StencilOp PassOp;
+	public StencilOp DepthFailOp;
+	public CompareOp CompareOp;
+
+	public SDL_Gpu.StencilOpState ToSDL()
+	{
+		return new SDL_Gpu.StencilOpState
+		{
+			FailOp = (SDL_Gpu.StencilOp) FailOp,
+			PassOp = (SDL_Gpu.StencilOp) PassOp,
+			DepthFailOp = (SDL_Gpu.StencilOp) DepthFailOp,
+			CompareOp = (SDL_Gpu.CompareOp) CompareOp
+		};
+	}
+}
+
+/// <summary>
+/// Determines how a color texture will be read/written in a render pass.
+/// </summary>
+public struct ColorAttachmentInfo
+{
+	public TextureSlice TextureSlice;
+
+	/// <summary>
+	/// If LoadOp is set to Clear, the texture slice will be cleared to this color.
+	/// </summary>
+	public Color ClearColor;
+
+	/// <summary>
+	/// Determines what is done with the texture slice memory
+	/// at the beginning of the render pass. <br/>
+	///
+	///   Load:
+	///     Loads the data currently in the texture slice. <br/>
+	///
+	///   Clear:
+	///     Clears the texture slice to a single color. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice data.
+	///     This is a good option if you know that every single pixel will be written in the render pass.
+	/// </summary>
+	public LoadOp LoadOp;
+
+	/// <summary>
+	/// Determines what is done with the texture slice memory
+	/// at the end of the render pass. <br/>
+	///
+	///   Store:
+	///     Stores the results of the render pass in the texture slice memory. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice memory.
+	/// </summary>
+	public StoreOp StoreOp;
+
+	/// <summary>
+	/// If true, cycles the texture if it is bound.
+	/// </summary>
+	public bool Cycle;
+
+	public ColorAttachmentInfo(
+		TextureSlice textureSlice,
+		bool cycle,
+		Color clearColor,
+		StoreOp storeOp = StoreOp.Store
+	) {
+		TextureSlice = textureSlice;
+		ClearColor = clearColor;
+		LoadOp = LoadOp.Clear;
+		StoreOp = storeOp;
+		Cycle = cycle;
+	}
+
+	public ColorAttachmentInfo(
+		TextureSlice textureSlice,
+		bool cycle,
+		LoadOp loadOp = LoadOp.DontCare,
+		StoreOp storeOp = StoreOp.Store
+	) {
+		TextureSlice = textureSlice;
+		ClearColor = Color.White;
+		LoadOp = loadOp;
+		StoreOp = storeOp;
+		Cycle = cycle;
+	}
+
+	public SDL_Gpu.ColorAttachmentInfo ToSDL()
+	{
+		return new SDL_Gpu.ColorAttachmentInfo
+		{
+			TextureSlice = TextureSlice.ToSDL(),
+			ClearColor = new SDL_Gpu.Color
+			{
+				R = ClearColor.R / 255f,
+				G = ClearColor.G / 255f,
+				B = ClearColor.B / 255f,
+				A = ClearColor.A / 255f
+			},
+			LoadOp = (SDL_Gpu.LoadOp) LoadOp,
+			StoreOp = (SDL_Gpu.StoreOp) StoreOp,
+			Cycle = Conversions.BoolToInt(Cycle)
+		};
+	}
+}
+
+/// <summary>
+/// Determines how a depth/stencil texture will be read/written in a render pass.
+/// </summary>
+public struct DepthStencilAttachmentInfo
+{
+	public TextureSlice TextureSlice;
+
+	/// <summary>
+	/// If LoadOp is set to Clear, the texture slice depth will be cleared to this depth value. <br/>
+	/// If StencilLoadOp is set to Clear, the texture slice stencil value will be cleared to this stencil value.
+	/// </summary>
+	public DepthStencilValue DepthStencilClearValue;
+
+	/// <summary>
+	/// Determines what is done with the texture slice depth values
+	/// at the beginning of the render pass. <br/>
+	///
+	///   Load:
+	///     Loads the data currently in the texture slice. <br/>
+	///
+	///   Clear:
+	///     Clears the texture slice to a single depth value. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice data.
+	///     This is a good option if you know that every single pixel will be written in the render pass.
+	/// </summary>
+	public LoadOp LoadOp;
+
+	/// <summary>
+	/// Determines what is done with the texture slice depth values
+	/// at the end of the render pass. <br/>
+	///
+	///   Store:
+	///     Stores the results of the render pass in the texture slice memory. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice memory.
+	///     This is usually a good option for depth textures that don't need to be reused.
+	/// </summary>
+	public StoreOp StoreOp;
+
+	/// <summary>
+	/// Determines what is done with the texture slice stencil values
+	/// at the beginning of the render pass. <br/>
+	///
+	///   Load:
+	///     Loads the data currently in the texture slice. <br/>
+	///
+	///   Clear:
+	///     Clears the texture slice to a single stencil value. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice data.
+	///     This is a good option if you know that every single pixel will be written in the render pass.
+	/// </summary>
+	public LoadOp StencilLoadOp;
+
+	/// <summary>
+	/// Determines what is done with the texture slice stencil values
+	/// at the end of the render pass. <br/>
+	///
+	///   Store:
+	///     Stores the results of the render pass in the texture slice memory. <br/>
+	///
+	///   DontCare:
+	///     The driver will do whatever it wants with the texture slice memory.
+	///     This is usually a good option for stencil textures that don't need to be reused.
+	/// </summary>
+	public StoreOp StencilStoreOp;
+
+	/// <summary>
+	/// If true, cycles the texture if it is bound.
+	/// </summary>
+	public bool Cycle;
+
+	public DepthStencilAttachmentInfo(
+		TextureSlice textureSlice,
+		bool cycle,
+		DepthStencilValue clearValue,
+		StoreOp depthStoreOp = StoreOp.DontCare,
+		StoreOp stencilStoreOp = StoreOp.DontCare
+	){
+		TextureSlice = textureSlice;
+		DepthStencilClearValue = clearValue;
+		LoadOp = LoadOp.Clear;
+		StoreOp = depthStoreOp;
+		StencilLoadOp = LoadOp.Clear;
+		StencilStoreOp = stencilStoreOp;
+		Cycle = cycle;
+	}
+
+	public DepthStencilAttachmentInfo(
+		TextureSlice textureSlice,
+		bool cycle,
+		LoadOp loadOp = LoadOp.DontCare,
+		StoreOp storeOp = StoreOp.DontCare,
+		LoadOp stencilLoadOp = LoadOp.DontCare,
+		StoreOp stencilStoreOp = StoreOp.DontCare
+	) {
+		TextureSlice = textureSlice;
+		DepthStencilClearValue = new DepthStencilValue();
+		LoadOp = loadOp;
+		StoreOp = storeOp;
+		StencilLoadOp = stencilLoadOp;
+		StencilStoreOp = stencilStoreOp;
+		Cycle = cycle;
+	}
+
+	public DepthStencilAttachmentInfo(
+		TextureSlice textureSlice,
+		bool cycle,
+		DepthStencilValue clearValue,
+		LoadOp loadOp,
+		StoreOp storeOp,
+		LoadOp stencilLoadOp,
+		StoreOp stencilStoreOp
+	) {
+		TextureSlice = textureSlice;
+		DepthStencilClearValue = clearValue;
+		LoadOp = loadOp;
+		StoreOp = storeOp;
+		StencilLoadOp = stencilLoadOp;
+		StencilStoreOp = stencilStoreOp;
+		Cycle = cycle;
+	}
+
+	public SDL_Gpu.DepthStencilAttachmentInfo ToSDL()
+	{
+		return new SDL_Gpu.DepthStencilAttachmentInfo
+		{
+			TextureSlice = TextureSlice.ToSDL(),
+			DepthStencilClearValue = DepthStencilClearValue.ToSDL(),
+			LoadOp = (SDL_Gpu.LoadOp) LoadOp,
+			StoreOp = (SDL_Gpu.StoreOp) StoreOp,
+			StencilLoadOp = (SDL_Gpu.LoadOp) StencilLoadOp,
+			StencilStoreOp = (SDL_Gpu.StoreOp) StencilStoreOp,
+			Cycle = Conversions.BoolToInt(Cycle)
+		};
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct ColorAttachmentDescription
+{
+	public TextureFormat Format;
+	public ColorAttachmentBlendState BlendState;
+
+	public ColorAttachmentDescription(
+		TextureFormat format,
+		ColorAttachmentBlendState blendState
+	) {
+		Format = format;
+		BlendState = blendState;
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct IndirectDrawCommand
+{
+	public uint VertexCount;
+	public uint InstanceCount;
+	public uint FirstVertex;
+	public uint FirstInstance;
+
+	public IndirectDrawCommand(
+		uint vertexCount,
+		uint instanceCount,
+		uint firstVertex,
+		uint firstInstance
+	) {
+		VertexCount = vertexCount;
+		InstanceCount = instanceCount;
+		FirstVertex = firstVertex;
+		FirstInstance = firstInstance;
+	}
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public struct BufferCopy
+{
+	public uint SrcOffset;
+	public uint DstOffset;
+	public uint Size;
+
+	public BufferCopy(
+		uint srcOffset,
+		uint dstOffset,
+		uint size
+	) {
+		SrcOffset = srcOffset;
+		DstOffset = dstOffset;
+		Size = size;
+	}
+
+	public SDL_Gpu.BufferCopy ToSDL()
+	{
+		return new SDL_Gpu.BufferCopy
+		{
+			SourceOffset = SrcOffset,
+			DestinationOffset = DstOffset,
+			Size = Size
+		};
+	}
+}
+
+/// <summary>
+/// Parameters for a copy between buffer and image.
+/// </summary>
+/// <param name="BufferOffset">The offset into the buffer.</param>
+/// <param name="BufferStride">If 0, image data is assumed tightly packed.</param>
+/// <param name="BufferImageHeight">If 0, image data is assumed tightly packed.</param>
+[StructLayout(LayoutKind.Sequential)]
+public readonly record struct BufferImageCopy(
+	uint BufferOffset,
+	uint BufferStride,
+	uint BufferImageHeight
+) {
+	public SDL_Gpu.BufferImageCopy ToSDL()
+	{
+		return new SDL_Gpu.BufferImageCopy
+		{
+			BufferOffset = BufferOffset,
+			BufferStride = BufferStride,
+			BufferImageHeight = BufferImageHeight
+		};
+	}
+}
+
+public readonly record struct GraphicsPipelineResourceInfo(
+	uint SamplerCount,
+	uint StorageBufferCount,
+	uint StorageTextureCount,
+	uint UniformBufferCount
+) {
+	public SDL_Gpu.GraphicsPipelineResourceInfo ToSDL()
+	{
+		return new SDL_Gpu.GraphicsPipelineResourceInfo
+		{
+			SamplerCount = SamplerCount,
+			StorageBufferCount = StorageBufferCount,
+			StorageTextureCount = StorageTextureCount,
+			UniformBufferCount = UniformBufferCount
+		};
+	}
+}
+
+public readonly record struct ComputePipelineResourceInfo(
+	uint ReadOnlyStorageTextureCount,
+	uint ReadOnlyStorageBufferCount,
+	uint ReadWriteStorageTextureCount,
+	uint ReadWriteStorageBufferCount,
+	uint UniformBufferCount
+) {
+	public SDL_Gpu.ComputePipelineResourceInfo ToSDL()
+	{
+		return new SDL_Gpu.ComputePipelineResourceInfo
+		{
+			ReadOnlyStorageTextureCount = ReadOnlyStorageTextureCount,
+			ReadOnlyStorageBufferCount = ReadOnlyStorageBufferCount,
+			ReadWriteStorageTextureCount = ReadWriteStorageTextureCount,
+			ReadWriteStorageBufferCount = ReadWriteStorageBufferCount,
+			UniformBufferCount = UniformBufferCount
+		};
+	}
+}
+
+/// <summary>
+/// A buffer-offset pair to be used when binding buffers.
+/// </summary>
+public readonly record struct BufferBinding(
+	GpuBuffer Buffer,
+	uint Offset
+) {
+	public SDL_Gpu.BufferBinding ToSDL()
+	{
+		return new SDL_Gpu.BufferBinding
+		{
+			Buffer = Buffer.Handle,
+			Offset = Offset
+		};
+	}
+}
+
+/// <summary>
+/// A texture-sampler pair to be used when binding samplers.
+/// </summary>
+public readonly record struct TextureSamplerBinding(
+	Texture Texture,
+	Sampler Sampler
+) {
+	public SDL_Gpu.TextureSamplerBinding ToSDL()
+	{
+		return new SDL_Gpu.TextureSamplerBinding
+		{
+			Texture = Texture.Handle,
+			Sampler = Sampler.Handle
+		};
+	}
+}
+
+public readonly record struct StorageBufferReadWriteBinding(
+	GpuBuffer Buffer,
+	bool cycle
+) {
+	public SDL_Gpu.StorageBufferReadWriteBinding ToSDL()
+	{
+		return new SDL_Gpu.StorageBufferReadWriteBinding
+		{
+			Buffer = Buffer.Handle,
+			Cycle = Conversions.BoolToInt(cycle)
+		};
+	}
+}
+
+public readonly record struct StorageTextureReadWriteBinding(
+	in TextureSlice TextureSlice,
+	bool cycle
+) {
+	public SDL_Gpu.StorageTextureReadWriteBinding ToSDL()
+	{
+		return new SDL_Gpu.StorageTextureReadWriteBinding
+		{
+			TextureSlice = TextureSlice.ToSDL(),
+			Cycle = Conversions.BoolToInt(cycle)
+		};
+	}
+}
+
+/// <summary>
+/// All of the information that is used to create a GraphicsPipeline.
+/// </summary>
+public struct GraphicsPipelineCreateInfo
+{
+	public Shader VertexShader;
+	public Shader FragmentShader;
+	public VertexInputState VertexInputState;
+	public PrimitiveType PrimitiveType;
+	public RasterizerState RasterizerState;
+	public MultisampleState MultisampleState;
+	public DepthStencilState DepthStencilState;
+	public GraphicsPipelineAttachmentInfo AttachmentInfo;
+	public GraphicsPipelineResourceInfo VertexShaderResourceInfo;
+	public GraphicsPipelineResourceInfo FragmentShaderResourceInfo;
+	public BlendConstants BlendConstants;
+}

src/Graphics/State/ColorAttachmentBlendState.cs

@@ -1,4 +1,4 @@
-using RefreshCS;
+using SDL2_gpuCS;
 
 namespace MoonWorks.Graphics
 {
@@ -106,18 +106,18 @@ namespace MoonWorks.Graphics
 			ColorWriteMask = ColorComponentFlags.None
 		};
 
-		public Refresh.ColorAttachmentBlendState ToRefresh()
+		public SDL_Gpu.ColorAttachmentBlendState ToSDL()
 		{
-			return new Refresh.ColorAttachmentBlendState
+			return new SDL_Gpu.ColorAttachmentBlendState
 			{
-				blendEnable = Conversions.BoolToByte(BlendEnable),
+				BlendEnable = Conversions.BoolToInt(BlendEnable),
-				alphaBlendOp = (Refresh.BlendOp) AlphaBlendOp,
+				AlphaBlendOp = (SDL_Gpu.BlendOp) AlphaBlendOp,
-				colorBlendOp = (Refresh.BlendOp) ColorBlendOp,
+				ColorBlendOp = (SDL_Gpu.BlendOp) ColorBlendOp,
-				colorWriteMask = (Refresh.ColorComponentFlags) ColorWriteMask,
+				ColorWriteMask = (SDL_Gpu.ColorComponentFlags) ColorWriteMask,
-				destinationAlphaBlendFactor = (Refresh.BlendFactor) DestinationAlphaBlendFactor,
+				DestinationAlphaBlendFactor = (SDL_Gpu.BlendFactor) DestinationAlphaBlendFactor,
-				destinationColorBlendFactor = (Refresh.BlendFactor) DestinationColorBlendFactor,
+				DestinationColorBlendFactor = (SDL_Gpu.BlendFactor) DestinationColorBlendFactor,
-				sourceAlphaBlendFactor = (Refresh.BlendFactor) SourceAlphaBlendFactor,
+				SourceAlphaBlendFactor = (SDL_Gpu.BlendFactor) SourceAlphaBlendFactor,
-				sourceColorBlendFactor = (Refresh.BlendFactor) SourceColorBlendFactor
+				SourceColorBlendFactor = (SDL_Gpu.BlendFactor) SourceColorBlendFactor
 			};
 		}
 	}

src/Graphics/State/ComputeShaderInfo.cs

@@ -1,50 +0,0 @@
-using System.Runtime.InteropServices;
-
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// Information that the compute pipeline needs about a compute shader.
-	/// </summary>
-	public struct ComputeShaderInfo
-	{
-		public ShaderModule ShaderModule;
-		public string EntryPointName;
-		public uint UniformBufferSize;
-		public uint BufferBindingCount;
-		public uint ImageBindingCount;
-
-		public unsafe static ComputeShaderInfo Create<T>(
-			ShaderModule shaderModule,
-			string entryPointName,
-			uint bufferBindingCount,
-			uint imageBindingCount
-		) where T : unmanaged
-		{
-			return new ComputeShaderInfo
-			{
-				ShaderModule = shaderModule,
-				EntryPointName = entryPointName,
-				UniformBufferSize = (uint) Marshal.SizeOf<T>(),
-				BufferBindingCount = bufferBindingCount,
-				ImageBindingCount = imageBindingCount
-			};
-		}
-
-        public static ComputeShaderInfo Create(
-            ShaderModule shaderModule,
-            string entryPointName,
-            uint bufferBindingCount,
-            uint imageBindingCount
-        )
-        {
-            return new ComputeShaderInfo
-			{
-				ShaderModule = shaderModule,
-				EntryPointName = entryPointName,
-				UniformBufferSize = 0,
-				BufferBindingCount = bufferBindingCount,
-				ImageBindingCount = imageBindingCount
-			};
-        }
-	}
-}

src/Graphics/State/DepthStencilState.cs

@@ -1,4 +1,6 @@
-namespace MoonWorks.Graphics
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics
 {
 	/// <summary>
 	/// Determines how data is written to and read from the depth/stencil buffer.
@@ -11,15 +13,30 @@
 		public bool DepthTestEnable;
 
 		/// <summary>
-		/// Describes the stencil operation for back-facing primitives.
+		/// Describes the back-face stencil operation.
 		/// </summary>
 		public StencilOpState BackStencilState;
 
 		/// <summary>
-		/// Describes the stencil operation for front-facing primitives.
+		/// Describes the front-face stencil operation.
 		/// </summary>
 		public StencilOpState FrontStencilState;
 
+		/// <summary>
+		/// The compare mask for stencil ops.
+		/// </summary>
+		public uint CompareMask;
+
+		/// <summary>
+		/// The write mask for stencil ops.
+		/// </summary>
+		public uint WriteMask;
+
+		/// <summary>
+		/// The stencil reference value.
+		/// </summary>
+		public uint Reference;
+
 		/// <summary>
 		/// The comparison operator used in the depth test.
 		/// </summary>
@@ -75,5 +92,24 @@
 			DepthBoundsTestEnable = false,
 			StencilTestEnable = false
 		};
+
+		public SDL_Gpu.DepthStencilState ToSDL()
+		{
+			return new SDL_Gpu.DepthStencilState
+			{
+				DepthTestEnable = Conversions.BoolToInt(DepthTestEnable),
+				BackStencilState = BackStencilState.ToSDL(),
+				FrontStencilState = FrontStencilState.ToSDL(),
+				CompareMask = CompareMask,
+				WriteMask = WriteMask,
+				Reference = Reference,
+				CompareOp = (SDL_Gpu.CompareOp) CompareOp,
+				DepthBoundsTestEnable = Conversions.BoolToInt(DepthBoundsTestEnable),
+				DepthWriteEnable = Conversions.BoolToInt(DepthWriteEnable),
+				MinDepthBounds = MinDepthBounds,
+				MaxDepthBounds = MaxDepthBounds,
+				StencilTestEnable = Conversions.BoolToInt(StencilTestEnable)
+			};
+		}
 	}
 }

src/Graphics/State/GraphicsPipelineAttachmentInfo.cs

@@ -14,7 +14,7 @@ namespace MoonWorks.Graphics
 		) {
 			ColorAttachmentDescriptions = colorAttachmentDescriptions;
 			HasDepthStencilAttachment = false;
-			DepthStencilFormat = TextureFormat.D16;
+			DepthStencilFormat = TextureFormat.D16_UNORM;
 		}
 
 		public GraphicsPipelineAttachmentInfo(

src/Graphics/State/GraphicsPipelineCreateInfo.cs

@@ -1,18 +0,0 @@
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// All of the information that is used to create a GraphicsPipeline.
-	/// </summary>
-	public struct GraphicsPipelineCreateInfo
-	{
-		public DepthStencilState DepthStencilState;
-		public GraphicsShaderInfo VertexShaderInfo;
-		public GraphicsShaderInfo FragmentShaderInfo;
-		public MultisampleState MultisampleState;
-		public RasterizerState RasterizerState;
-		public PrimitiveType PrimitiveType;
-		public VertexInputState VertexInputState;
-		public GraphicsPipelineAttachmentInfo AttachmentInfo;
-		public BlendConstants BlendConstants;
-	}
-}

src/Graphics/State/GraphicsShaderInfo.cs

@@ -1,44 +0,0 @@
-using System.Runtime.InteropServices;
-
-namespace MoonWorks.Graphics
-{
-	/// <summary>
-	/// Information that the pipeline needs about a graphics shader.
-	/// </summary>
-	public struct GraphicsShaderInfo
-	{
-		public ShaderModule ShaderModule;
-		public string EntryPointName;
-		public uint UniformBufferSize;
-		public uint SamplerBindingCount;
-
-		public unsafe static GraphicsShaderInfo Create<T>(
-			ShaderModule shaderModule,
-			string entryPointName,
-			uint samplerBindingCount
-		) where T : unmanaged
-		{
-			return new GraphicsShaderInfo
-			{
-				ShaderModule = shaderModule,
-				EntryPointName = entryPointName,
-				UniformBufferSize = (uint) Marshal.SizeOf<T>(),
-				SamplerBindingCount = samplerBindingCount
-			};
-		}
-
-		public static GraphicsShaderInfo Create(
-			ShaderModule shaderModule,
-			string entryPointName,
-			uint samplerBindingCount
-		) {
-			return new GraphicsShaderInfo
-			{
-				ShaderModule = shaderModule,
-				EntryPointName = entryPointName,
-				UniformBufferSize = 0,
-				SamplerBindingCount = samplerBindingCount
-			};
-		}
-	}
-}

src/Graphics/State/MultisampleState.cs

@@ -1,4 +1,6 @@
-namespace MoonWorks.Graphics
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics
 {
 	/// <summary>
 	/// Specifies how many samples should be used in rasterization.
@@ -21,5 +23,14 @@
 			MultisampleCount = sampleCount;
 			SampleMask = sampleMask;
 		}
+
+		public SDL_Gpu.MultisampleState ToSDL()
+		{
+			return new SDL_Gpu.MultisampleState
+			{
+				MultisampleCount = (SDL_Gpu.SampleCount) MultisampleCount,
+				SampleMask = SampleMask
+			};
+		}
 	}
 }

src/Graphics/State/RasterizerState.cs

@@ -1,10 +1,12 @@
-namespace MoonWorks.Graphics
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// Specifies how the rasterizer should be configured for a graphics pipeline.
+/// </summary>
+public struct RasterizerState
 {
-	/// <summary>
-	/// Specifies how the rasterizer should be configured for a graphics pipeline.
-	/// </summary>
-	public struct RasterizerState
-	{
 	/// <summary>
 	/// Specifies whether front faces, back faces, none, or both should be culled.
 	/// </summary>
@@ -103,5 +105,18 @@
 		FillMode = FillMode.Line,
 		DepthBiasEnable = false
 	};
+
+	public SDL_Gpu.RasterizerState ToSDL()
+	{
+		return new SDL_Gpu.RasterizerState
+		{
+			CullMode = (SDL_Gpu.CullMode) CullMode,
+			DepthBiasClamp = DepthBiasClamp,
+			DepthBiasConstantFactor = DepthBiasConstantFactor,
+			DepthBiasEnable = Conversions.BoolToInt(DepthBiasEnable),
+			DepthBiasSlopeFactor = DepthBiasSlopeFactor,
+			FillMode = (SDL_Gpu.FillMode) FillMode,
+			FrontFace = (SDL_Gpu.FrontFace) FrontFace
+		};
 	}
 }

src/Graphics/State/SamplerCreateInfo.cs

@@ -1,12 +1,12 @@
-using RefreshCS;
+using SDL2_gpuCS;
 
-namespace MoonWorks.Graphics
+namespace MoonWorks.Graphics;
+
+/// <summary>
+/// All of the information that is used to create a sampler.
+/// </summary>
+public struct SamplerCreateInfo
 {
-	/// <summary>
-	/// All of the information that is used to create a sampler.
-	/// </summary>
-	public struct SamplerCreateInfo
-	{
 	/// <summary>
 	/// Minification filter mode. Used when the image is downscaled.
 	/// </summary>
@@ -150,25 +150,24 @@ namespace MoonWorks.Graphics
 		MaxLod = 1000
 	};
 
-		public Refresh.SamplerStateCreateInfo ToRefreshSamplerStateCreateInfo()
+	public SDL_Gpu.SamplerCreateInfo ToSDL()
 	{
-			return new Refresh.SamplerStateCreateInfo
+		return new SDL_Gpu.SamplerCreateInfo
 		{
-				minFilter = (Refresh.Filter) MinFilter,
+			MinFilter = (SDL_Gpu.Filter) MinFilter,
-				magFilter = (Refresh.Filter) MagFilter,
+			MagFilter = (SDL_Gpu.Filter) MagFilter,
-				mipmapMode = (Refresh.SamplerMipmapMode) MipmapMode,
+			MipmapMode = (SDL_Gpu.SamplerMipmapMode) MipmapMode,
-				addressModeU = (Refresh.SamplerAddressMode) AddressModeU,
+			AddressModeU = (SDL_Gpu.SamplerAddressMode) AddressModeU,
-				addressModeV = (Refresh.SamplerAddressMode) AddressModeV,
+			AddressModeV = (SDL_Gpu.SamplerAddressMode) AddressModeV,
-				addressModeW = (Refresh.SamplerAddressMode) AddressModeW,
+			AddressModeW = (SDL_Gpu.SamplerAddressMode) AddressModeW,
-				mipLodBias = MipLodBias,
+			MipLodBias = MipLodBias,
-				anisotropyEnable = Conversions.BoolToByte(AnisotropyEnable),
+			AnisotropyEnable = Conversions.BoolToByte(AnisotropyEnable),
-				maxAnisotropy = MaxAnisotropy,
+			MaxAnisotropy = MaxAnisotropy,
-				compareEnable = Conversions.BoolToByte(CompareEnable),
+			CompareEnable = Conversions.BoolToByte(CompareEnable),
-				compareOp = (Refresh.CompareOp) CompareOp,
+			CompareOp = (SDL_Gpu.CompareOp) CompareOp,
-				minLod = MinLod,
+			MinLod = MinLod,
-				maxLod = MaxLod,
+			MaxLod = MaxLod,
-				borderColor = (Refresh.BorderColor) BorderColor
+			BorderColor = (SDL_Gpu.BorderColor) BorderColor
 		};
 	}
-	}
 }

src/Graphics/State/TextureCreateInfo.cs

@@ -1,4 +1,4 @@
-using RefreshCS;
+using SDL2_gpuCS;
 
 namespace MoonWorks.Graphics
 {
@@ -11,23 +11,25 @@ namespace MoonWorks.Graphics
 		public uint Height;
 		public uint Depth;
 		public bool IsCube;
+		public uint LayerCount;
 		public uint LevelCount;
 		public SampleCount SampleCount;
 		public TextureFormat Format;
 		public TextureUsageFlags UsageFlags;
 
-		public Refresh.TextureCreateInfo ToRefreshTextureCreateInfo()
+		public SDL_Gpu.TextureCreateInfo ToSDL()
 		{
-			return new Refresh.TextureCreateInfo
+			return new SDL_Gpu.TextureCreateInfo
 			{
-				width = Width,
+				Width = Width,
-				height = Height,
+				Height = Height,
-				depth = Depth,
+				Depth = Depth,
-				isCube = Conversions.BoolToByte(IsCube),
+				IsCube = Conversions.BoolToInt(IsCube),
-				levelCount = LevelCount,
+				LayerCount = LayerCount,
-				sampleCount = (Refresh.SampleCount) SampleCount,
+				LevelCount = LevelCount,
-				format = (Refresh.TextureFormat) Format,
+				SampleCount = (SDL_Gpu.SampleCount) SampleCount,
-				usageFlags = (Refresh.TextureUsageFlags) UsageFlags
+				Format = (SDL_Gpu.TextureFormat) Format,
+				UsageFlags = (SDL_Gpu.TextureUsageFlags) UsageFlags
 			};
 		}
 	}

src/Graphics/StockShaders/Source/blit.frag

@@ -0,0 +1,12 @@
+#version 450
+
+layout (location = 0) in vec2 TexCoord;
+
+layout (location = 0) out vec4 FragColor;
+
+layout (binding = 0, set = 1) uniform sampler2D TexSampler;
+
+void main()
+{
+	FragColor = texture(TexSampler, TexCoord);
+}

src/Graphics/TextureRegion.cs

@@ -0,0 +1,46 @@
+using SDL2_gpuCS;
+
+namespace MoonWorks.Graphics
+{
+	/// <summary>
+	/// A texture region specifies a subregion of a texture.
+	/// These are used by copy commands.
+	/// </summary>
+	public struct TextureRegion
+	{
+		public TextureSlice TextureSlice;
+		public uint X;
+		public uint Y;
+		public uint Z;
+		public uint Width;
+		public uint Height;
+		public uint Depth;
+
+		public uint Size => (Width * Height * Depth * Texture.BytesPerPixel(TextureSlice.Texture.Format) / Texture.BlockSizeSquared(TextureSlice.Texture.Format)) >> (int) TextureSlice.MipLevel;
+
+		public TextureRegion(Texture texture)
+		{
+			TextureSlice = new TextureSlice(texture);
+			X = 0;
+			Y = 0;
+			Z = 0;
+			Width = texture.Width;
+			Height = texture.Height;
+			Depth = texture.Depth;
+		}
+
+		public SDL_Gpu.TextureRegion ToSDL()
+		{
+			return new SDL_Gpu.TextureRegion
+			{
+				TextureSlice = TextureSlice.ToSDL(),
+				X = X,
+				Y = Y,
+				Z = Z,
+				W = Width,
+				H = Height,
+				D = Depth
+			};
+		}
+	}
+}

src/Graphics/TextureSlice.cs

@@ -1,57 +1,31 @@
-using RefreshCS;
+using SDL2_gpuCS;
+namespace MoonWorks.Graphics;
 
-namespace MoonWorks.Graphics
+/// <summary>
+/// A texture slice specifies a subresource of a texture.
+/// </summary>
+public struct TextureSlice
 {
-	/// <summary>
+	public Texture Texture;
-	/// A texture slice specifies a subregion of a texture.
+	public uint MipLevel;
-	/// Many operations can use texture slices in place of textures for the sake of convenience.
+	public uint Layer;
-	/// </summary>
-	public struct TextureSlice
-	{
-		public Texture Texture { get; }
-		public Rect Rectangle { get; }
-		public uint Depth { get; }
-		public uint Layer { get; }
-		public uint Level { get; }
 
-		public uint Size => (uint) (Rectangle.W * Rectangle.H * Texture.BytesPerPixel(Texture.Format) / Texture.BlockSizeSquared(Texture.Format));
+	public uint Size => (Texture.Width * Texture.Height * Texture.Depth * Texture.BytesPerPixel(Texture.Format) / Texture.BlockSizeSquared(Texture.Format)) >> (int) MipLevel;
 
 	public TextureSlice(Texture texture)
 	{
 		Texture = texture;
-			Rectangle = new Rect
+		MipLevel = 0;
-			{
-				X = 0,
-				Y = 0,
-				W = (int) texture.Width,
-				H = (int) texture.Height
-			};
-			Depth = 0;
 		Layer = 0;
-			Level = 0;
 	}
 
-		public TextureSlice(Texture texture, Rect rectangle, uint depth = 0, uint layer = 0, uint level = 0)
+	public SDL_Gpu.TextureSlice ToSDL()
 	{
-			Texture = texture;
+		return new SDL_Gpu.TextureSlice
-			Rectangle = rectangle;
-			Depth = depth;
-			Layer = layer;
-			Level = level;
-		}
-
-		public Refresh.TextureSlice ToRefreshTextureSlice()
 		{
-			Refresh.TextureSlice textureSlice = new Refresh.TextureSlice
+			Texture = Texture.Handle,
-			{
+			MipLevel = MipLevel,
-				texture = Texture.Handle,
+			Layer = Layer
-				rectangle = Rectangle.ToRefresh(),
-				depth = Depth,
-				layer = Layer,
-				level = Level
 		};
-
-			return textureSlice;
-		}
 	}
 }

src/Logger.cs

@@ -1,5 +1,4 @@
 using System;
-using RefreshCS;
 
 namespace MoonWorks
 {
@@ -9,19 +8,6 @@ namespace MoonWorks
 		public static Action<string> LogWarn = LogWarnDefault;
 		public static Action<string> LogError = LogErrorDefault;
 
-		private static RefreshCS.Refresh.Refresh_LogFunc LogInfoFunc = RefreshLogInfo;
-		private static RefreshCS.Refresh.Refresh_LogFunc LogWarnFunc = RefreshLogWarn;
-		private static RefreshCS.Refresh.Refresh_LogFunc LogErrorFunc = RefreshLogError;
-
-		internal static void Initialize()
-		{
-			Refresh.Refresh_HookLogFunctions(
-				LogInfoFunc,
-				LogWarnFunc,
-				LogErrorFunc
-			);
-		}
-
 		private static void LogInfoDefault(string str)
 		{
 			Console.ForegroundColor = ConsoleColor.Green;

src/Video/VideoAV1.cs

@@ -11,10 +11,6 @@ namespace MoonWorks.Video
 	{
 		public string Filename { get; }
 
-		// "double buffering" so we can loop without a stutter
-		internal VideoAV1Stream StreamA { get; }
-		internal VideoAV1Stream StreamB { get; }
-
 		public int Width => width;
 		public int Height => height;
 		public double FramesPerSecond { get; set; }
@@ -67,23 +63,6 @@ namespace MoonWorks.Video
 			FramesPerSecond = framesPerSecond;
 
 			Filename = filename;
-
-			StreamA = new VideoAV1Stream(device, this);
-			StreamB = new VideoAV1Stream(device, this);
-		}
-
-		// NOTE: if you call this while a VideoPlayer is playing the stream, your program will explode
-		protected override void Dispose(bool disposing)
-		{
-			if (!IsDisposed)
-			{
-				if (disposing)
-				{
-					StreamA.Dispose();
-					StreamB.Dispose();
-				}
-			}
-			base.Dispose(disposing);
 		}
 	}
 }

src/Video/VideoAV1Stream.cs

@@ -1,13 +1,17 @@
 using System;
+using System.Collections.Concurrent;
+using System.Threading;
 using MoonWorks.Graphics;
 
 namespace MoonWorks.Video
 {
+	// Note that all public methods are async.
 	internal class VideoAV1Stream : GraphicsResource
 	{
 		public IntPtr Handle => handle;
 		IntPtr handle;
 
+		public bool Loaded => handle != IntPtr.Zero;
 		public bool Ended => Dav1dfile.df_eos(Handle) == 1;
 
 		public IntPtr yDataHandle;
@@ -20,33 +24,89 @@ namespace MoonWorks.Video
 
 		public bool FrameDataUpdated { get; set; }
 
-		public VideoAV1Stream(GraphicsDevice device, VideoAV1 video) : base(device)
+		private BlockingCollection<Action> Actions = new BlockingCollection<Action>();
+
+		private bool Running = false;
+
+		Thread Thread;
+
+		public VideoAV1Stream(GraphicsDevice device) : base(device)
 		{
-			if (Dav1dfile.df_fopen(video.Filename, out handle) == 0)
+			handle = IntPtr.Zero;
-			{
+
-				throw new Exception("Failed to open video file!");
+			Running = true;
+
+			Thread = new Thread(ThreadMain);
+			Thread.Start();
 		}
 
-			Reset();
+		private void ThreadMain()
+		{
+			while (Running)
+			{
+				// block until we can take an action, then run it
+				var action = Actions.Take();
+				action.Invoke();
+			}
+
+			// shutting down...
+			while (Actions.TryTake(out var action))
+			{
+				action.Invoke();
+			}
+		}
+
+		public void Load(string filename)
+		{
+			Actions.Add(() => LoadHelper(filename));
 		}
 
 		public void Reset()
 		{
-			lock (this)
+			Actions.Add(ResetHelper);
-			{
-				Dav1dfile.df_reset(Handle);
-				ReadNextFrame();
-			}
 		}
 
 		public void ReadNextFrame()
+		{
+			Actions.Add(ReadNextFrameHelper);
+		}
+
+		public void Unload()
+		{
+			Actions.Add(UnloadHelper);
+		}
+
+		private void LoadHelper(string filename)
+		{
+			if (!Loaded)
+			{
+				if (Dav1dfile.df_fopen(filename, out handle) == 0)
+				{
+					Logger.LogError("Failed to load video file: " + filename);
+					throw new Exception("Failed to load video file!");
+				}
+
+				Reset();
+			}
+		}
+
+		private void ResetHelper()
+		{
+			if (Loaded)
+			{
+				Dav1dfile.df_reset(handle);
+				ReadNextFrame();
+			}
+		}
+
+		private void ReadNextFrameHelper()
+		{
+			if (Loaded && !Ended)
 			{
 				lock (this)
-			{
-				if (!Ended)
 				{
 					if (Dav1dfile.df_readvideo(
-						Handle,
+						handle,
 						1,
 						out var yDataHandle,
 						out var uDataHandle,
@@ -70,11 +130,26 @@ namespace MoonWorks.Video
 			}
 		}
 
+		private void UnloadHelper()
+		{
+			if (Loaded)
+			{
+				Dav1dfile.df_close(handle);
+				handle = IntPtr.Zero;
+			}
+		}
+
 		protected override void Dispose(bool disposing)
 		{
 			if (!IsDisposed)
 			{
-				Dav1dfile.df_close(Handle);
+				Unload();
+				Running = false;
+
+				if (disposing)
+				{
+					Thread.Join();
+				}
 			}
 			base.Dispose(disposing);
 		}

src/Video/VideoPlayer.cs

@@ -16,18 +16,15 @@ namespace MoonWorks.Video
 		public float PlaybackSpeed { get; set; } = 1;
 
 		private VideoAV1 Video = null;
-		private VideoAV1Stream CurrentStream = null;
+		private VideoAV1Stream Stream { get; }
 
-		private Task ReadNextFrameTask;
-		private Task ResetStreamATask;
-		private Task ResetStreamBTask;
-
-		private GraphicsDevice GraphicsDevice;
 		private Texture yTexture = null;
 		private Texture uTexture = null;
 		private Texture vTexture = null;
 		private Sampler LinearSampler;
 
+		private TransferBuffer TransferBuffer;
+
 		private int currentFrame;
 
 		private Stopwatch timer;
@@ -36,7 +33,7 @@ namespace MoonWorks.Video
 
 		public VideoPlayer(GraphicsDevice device) : base(device)
 		{
-			GraphicsDevice = device;
+			Stream = new VideoAV1Stream(device);
 
 			LinearSampler = new Sampler(device, SamplerCreateInfo.LinearClamp);
 
@@ -51,50 +48,50 @@ namespace MoonWorks.Video
 		{
 			if (Video != video)
 			{
-				Stop();
+				Unload();
 
 				if (RenderTexture == null)
 				{
-					RenderTexture = CreateRenderTexture(GraphicsDevice, video.Width, video.Height);
+					RenderTexture = CreateRenderTexture(Device, video.Width, video.Height);
 				}
 
 				if (yTexture == null)
 				{
-					yTexture = CreateSubTexture(GraphicsDevice, video.Width, video.Height);
+					yTexture = CreateSubTexture(Device, video.Width, video.Height);
 				}
 
 				if (uTexture == null)
 				{
-					uTexture = CreateSubTexture(GraphicsDevice, video.UVWidth, video.UVHeight);
+					uTexture = CreateSubTexture(Device, video.UVWidth, video.UVHeight);
 				}
 
 				if (vTexture == null)
 				{
-					vTexture = CreateSubTexture(GraphicsDevice, video.UVWidth, video.UVHeight);
+					vTexture = CreateSubTexture(Device, video.UVWidth, video.UVHeight);
 				}
 
 				if (video.Width != RenderTexture.Width || video.Height != RenderTexture.Height)
 				{
 					RenderTexture.Dispose();
-					RenderTexture = CreateRenderTexture(GraphicsDevice, video.Width, video.Height);
+					RenderTexture = CreateRenderTexture(Device, video.Width, video.Height);
 				}
 
 				if (video.Width != yTexture.Width || video.Height != yTexture.Height)
 				{
 					yTexture.Dispose();
-					yTexture = CreateSubTexture(GraphicsDevice, video.Width, video.Height);
+					yTexture = CreateSubTexture(Device, video.Width, video.Height);
 				}
 
 				if (video.UVWidth != uTexture.Width || video.UVHeight != uTexture.Height)
 				{
 					uTexture.Dispose();
-					uTexture = CreateSubTexture(GraphicsDevice, video.UVWidth, video.UVHeight);
+					uTexture = CreateSubTexture(Device, video.UVWidth, video.UVHeight);
 				}
 
 				if (video.UVWidth != vTexture.Width || video.UVHeight != vTexture.Height)
 				{
 					vTexture.Dispose();
-					vTexture = CreateSubTexture(GraphicsDevice, video.UVWidth, video.UVHeight);
+					vTexture = CreateSubTexture(Device, video.UVWidth, video.UVHeight);
 				}
 
 				Video = video;
@@ -155,7 +152,7 @@ namespace MoonWorks.Video
 			lastTimestamp = 0;
 			timeElapsed = 0;
 
-			InitializeDav1dStream();
+			ResetDav1dStreams();
 
 			State = VideoState.Stopped;
 		}
@@ -165,9 +162,21 @@ namespace MoonWorks.Video
 		/// </summary>
 		public void Unload()
 		{
-			Stop();
+			if (Video == null)
-			ResetStreamATask?.Wait();
+			{
-			ResetStreamBTask?.Wait();
+				return;
+			}
+
+			timer.Stop();
+			timer.Reset();
+
+			lastTimestamp = 0;
+			timeElapsed = 0;
+
+			State = VideoState.Stopped;
+
+			Stream.Unload();
+
 			Video = null;
 		}
 
@@ -187,38 +196,26 @@ namespace MoonWorks.Video
 			int thisFrame = ((int) (timeElapsed / (1000.0 / Video.FramesPerSecond)));
 			if (thisFrame > currentFrame)
 			{
-				if (CurrentStream.FrameDataUpdated)
+				if (Stream.FrameDataUpdated)
 				{
 					UpdateRenderTexture();
-					CurrentStream.FrameDataUpdated = false;
+					Stream.FrameDataUpdated = false;
 				}
 
 				currentFrame = thisFrame;
-				ReadNextFrameTask = Task.Run(CurrentStream.ReadNextFrame);
+				Stream.ReadNextFrame();
-				ReadNextFrameTask.ContinueWith(HandleTaskException, TaskContinuationOptions.OnlyOnFaulted);
 			}
 
-			if (CurrentStream.Ended)
+			if (Stream.Ended)
 			{
 				timer.Stop();
 				timer.Reset();
 
-				var task = Task.Run(CurrentStream.Reset);
+				Stream.Reset();
-				task.ContinueWith(HandleTaskException, TaskContinuationOptions.OnlyOnFaulted);
-
-				if (CurrentStream == Video.StreamA)
-				{
-					ResetStreamATask = task;
-				}
-				else
-				{
-					ResetStreamBTask = task;
-				}
 
 				if (Loop)
 				{
-					// Start over on the next stream!
+					// Start over!
-					CurrentStream = (CurrentStream == Video.StreamA) ? Video.StreamB : Video.StreamA;
 					currentFrame = -1;
 					timer.Start();
 				}
@@ -231,40 +228,90 @@ namespace MoonWorks.Video
 
 		private void UpdateRenderTexture()
 		{
-			lock (CurrentStream)
+			uint uOffset;
-			{
+			uint vOffset;
-				var commandBuffer = GraphicsDevice.AcquireCommandBuffer();
+			uint yStride;
+			uint uvStride;
 
-				commandBuffer.SetTextureDataYUV(
+			lock (Stream)
+			{
+				var ySpan = new Span<byte>((void*) Stream.yDataHandle, (int) Stream.yDataLength);
+				var uSpan = new Span<byte>((void*) Stream.uDataHandle, (int) Stream.uvDataLength);
+				var vSpan = new Span<byte>((void*) Stream.vDataHandle, (int) Stream.uvDataLength);
+
+				if (TransferBuffer == null || TransferBuffer.Size < ySpan.Length + uSpan.Length + vSpan.Length)
+				{
+					TransferBuffer?.Dispose();
+					TransferBuffer = new TransferBuffer(Device, TransferUsage.Texture, (uint) (ySpan.Length + uSpan.Length + vSpan.Length));
+				}
+				TransferBuffer.SetData(ySpan, 0, TransferOptions.Cycle);
+				TransferBuffer.SetData(uSpan, (uint) ySpan.Length, TransferOptions.Unsafe);
+				TransferBuffer.SetData(vSpan, (uint) (ySpan.Length + uSpan.Length), TransferOptions.Unsafe);
+
+				uOffset = (uint) ySpan.Length;
+				vOffset = (uint) (ySpan.Length + vSpan.Length);
+
+				yStride = Stream.yStride;
+				uvStride = Stream.uvStride;
+			}
+
+			var commandBuffer = Device.AcquireCommandBuffer();
+
+			commandBuffer.BeginCopyPass();
+
+			commandBuffer.UploadToTexture(
+				TransferBuffer,
 				yTexture,
-					uTexture,
+				new BufferImageCopy
-					vTexture,
+				{
-					CurrentStream.yDataHandle,
+					BufferOffset = 0,
-					CurrentStream.uDataHandle,
+					BufferStride = yStride,
-					CurrentStream.vDataHandle,
+					BufferImageHeight = yTexture.Height
-					CurrentStream.yDataLength,
+				},
-					CurrentStream.uvDataLength,
+				WriteOptions.Cycle
-					CurrentStream.yStride,
-					CurrentStream.uvStride
 			);
 
+			commandBuffer.UploadToTexture(
+				TransferBuffer,
+				uTexture,
+				new BufferImageCopy{
+					BufferOffset = uOffset,
+					BufferStride = uvStride,
+					BufferImageHeight = uTexture.Height
+				},
+				WriteOptions.Cycle
+			);
+
+			commandBuffer.UploadToTexture(
+				TransferBuffer,
+				vTexture,
+				new BufferImageCopy
+				{
+					BufferOffset = vOffset,
+					BufferStride = uvStride,
+					BufferImageHeight = vTexture.Height
+				},
+				WriteOptions.Cycle
+			);
+
+			commandBuffer.EndCopyPass();
+
 			commandBuffer.BeginRenderPass(
-					new ColorAttachmentInfo(RenderTexture, Color.Black)
+				new ColorAttachmentInfo(RenderTexture, WriteOptions.Cycle, Color.Black)
 			);
 
-				commandBuffer.BindGraphicsPipeline(GraphicsDevice.VideoPipeline);
+			commandBuffer.BindGraphicsPipeline(Device.VideoPipeline);
 			commandBuffer.BindFragmentSamplers(
 				new TextureSamplerBinding(yTexture, LinearSampler),
 				new TextureSamplerBinding(uTexture, LinearSampler),
 				new TextureSamplerBinding(vTexture, LinearSampler)
 			);
 
-				commandBuffer.DrawPrimitives(0, 1, 0, 0);
+			commandBuffer.DrawPrimitives(0, 1);
 
 			commandBuffer.EndRenderPass();
 
-				GraphicsDevice.Submit(commandBuffer);
+			Device.Submit(commandBuffer);
-			}
 		}
 
 		private static Texture CreateRenderTexture(GraphicsDevice graphicsDevice, int width, int height)
@@ -291,23 +338,14 @@ namespace MoonWorks.Video
 
 		private void InitializeDav1dStream()
 		{
-			ReadNextFrameTask?.Wait();
+			Stream.Load(Video.Filename);
-
-			ResetStreamATask = Task.Run(Video.StreamA.Reset);
-			ResetStreamATask.ContinueWith(HandleTaskException, TaskContinuationOptions.OnlyOnFaulted);
-			ResetStreamBTask = Task.Run(Video.StreamB.Reset);
-			ResetStreamBTask.ContinueWith(HandleTaskException, TaskContinuationOptions.OnlyOnFaulted);
-
-			CurrentStream = Video.StreamA;
 			currentFrame = -1;
 		}
 
-		private static void HandleTaskException(Task task)
+		private void ResetDav1dStreams()
 		{
-			if (task.Exception.InnerException is not TaskCanceledException)
+			Stream.Reset();
-			{
+			currentFrame = -1;
-				throw task.Exception;
-			}
 		}
 
 		protected override void Dispose(bool disposing)

src/Window.cs

@@ -19,8 +19,18 @@ namespace MoonWorks
 		internal Texture SwapchainTexture { get; set; }
 
 		public bool Claimed { get; internal set; }
+		public MoonWorks.Graphics.SwapchainComposition SwapchainComposition { get; internal set; }
 		public MoonWorks.Graphics.TextureFormat SwapchainFormat { get; internal set; }
 
+		public (int, int) Position
+		{
+			get
+			{
+				SDL.SDL_GetWindowPosition(Handle, out var x, out var y);
+				return (x, y);
+			}
+		}
+
 		private bool IsDisposed;
 
 		private static Dictionary<uint, Window> idLookup = new Dictionary<uint, Window>();
@@ -113,6 +123,14 @@ namespace MoonWorks
 			}
 		}
 
+		/// <summary>
+		/// Sets the window position.
+		/// </summary>
+		public void SetPosition(int x, int y)
+		{
+			SDL.SDL_SetWindowPosition(Handle, x, y);
+		}
+
 		internal static Window Lookup(uint windowID)
 		{
 			return idLookup.ContainsKey(windowID) ? idLookup[windowID] : null;

src/WindowCreateInfo.cs

@@ -22,9 +22,13 @@
 		/// </summary>
 		public ScreenMode ScreenMode;
 		/// <summary>
+		/// Specifies the swapchain composition. Use SDR unless you know what you're doing.
+		/// </summary>
+		public Graphics.SwapchainComposition SwapchainComposition;
+		/// <summary>
 		/// Specifies the presentation mode for the window. Roughly equivalent to V-Sync.
 		/// </summary>
-		public PresentMode PresentMode;
+		public Graphics.PresentMode PresentMode;
 		/// <summary>
 		/// Whether the window can be resized using the operating system's window dragging feature.
 		/// </summary>
@@ -39,7 +43,7 @@
 			uint windowWidth,
 			uint windowHeight,
 			ScreenMode screenMode,
-			PresentMode presentMode,
+			Graphics.PresentMode presentMode,
 			bool systemResizable = false,
 			bool startMaximized = false
 		) {