bunch of Refresh api changes, plus more validation

src/Graphics/CommandBuffer.cs

@@ -16,6 +16,7 @@ namespace MoonWorks.Graphics
 		GraphicsPipeline currentGraphicsPipeline;
 		ComputePipeline currentComputePipeline;
 		bool renderPassActive;
+		SampleCount currentSampleCount;
 
 		// called from RefreshDevice
 		internal CommandBuffer(GraphicsDevice device, IntPtr handle)
@@ -25,6 +26,7 @@ namespace MoonWorks.Graphics
 			currentGraphicsPipeline = null;
 			currentComputePipeline = null;
 			renderPassActive = false;
+			currentSampleCount = SampleCount.One;
 		}
 
 		// FIXME: we can probably use the NativeMemory functions to not have to generate arrays here
@@ -55,7 +57,6 @@ namespace MoonWorks.Graphics
 				Refresh.Refresh_BeginRenderPass(
 					Device.Handle,
 					Handle,
-					IntPtr.Zero,
 					(IntPtr) pColorAttachmentInfos,
 					(uint) colorAttachmentInfos.Length,
 					IntPtr.Zero
@@ -78,7 +79,7 @@ namespace MoonWorks.Graphics
 		)
 		{
 #if DEBUG
-			AssertValidDepthAttachments(depthStencilAttachmentInfo);
+			AssertValidDepthAttachment(depthStencilAttachmentInfo);
 			AssertValidColorAttachments(colorAttachmentInfos, false);
 #endif
 
@@ -96,88 +97,6 @@ namespace MoonWorks.Graphics
 				Refresh.Refresh_BeginRenderPass(
 					Device.Handle,
 					Handle,
-					IntPtr.Zero,
-					pColorAttachmentInfos,
-					(uint) colorAttachmentInfos.Length,
-					&refreshDepthStencilAttachmentInfo
-				);
-			}
-
-			renderPassActive = true;
-		}
-
-		/// <summary>
-		/// Begins a render pass.
-		/// All render state, resource binding, and draw commands must be made within a render pass.
-		/// It is an error to call this after calling BeginRenderPass but before calling EndRenderPass.
-		/// </summary>
-		/// <param name="renderArea">The rectangle that should be drawn to on the attachments.</param>
-		/// <param name="colorAttachmentInfos">The color attachments to use in the render pass.</param>
-		public unsafe void BeginRenderPass(
-			in Rect renderArea,
-			params ColorAttachmentInfo[] colorAttachmentInfos
-		)
-		{
-#if DEBUG
-			AssertValidColorAttachments(colorAttachmentInfos, true);
-#endif
-
-			var refreshColorAttachmentInfos = new Refresh.ColorAttachmentInfo[colorAttachmentInfos.Length];
-
-			for (var i = 0; i < colorAttachmentInfos.Length; i += 1)
-			{
-				refreshColorAttachmentInfos[i] = colorAttachmentInfos[i].ToRefresh();
-			}
-
-			fixed (Refresh.ColorAttachmentInfo* pColorAttachmentInfos = refreshColorAttachmentInfos)
-			{
-				Refresh.Refresh_BeginRenderPass(
-					Device.Handle,
-					Handle,
-					renderArea.ToRefresh(),
-					(IntPtr) pColorAttachmentInfos,
-					(uint) colorAttachmentInfos.Length,
-					IntPtr.Zero
-				);
-			}
-
-			renderPassActive = true;
-		}
-
-		/// <summary>
-		/// Begins a render pass.
-		/// All render state, resource binding, and draw commands must be made within a render pass.
-		/// It is an error to call this after calling BeginRenderPass but before calling EndRenderPass.
-		/// </summary>
-		/// <param name="renderArea">The rectangle that should be drawn to on the attachments.</param>
-		/// <param name="depthStencilAttachmentInfo">The depth stencil attachment to use in the render pass.</param>
-		/// <param name="colorAttachmentInfos">The color attachments to use in the render pass.</param>
-		public unsafe void BeginRenderPass(
-			in Rect renderArea,
-			DepthStencilAttachmentInfo depthStencilAttachmentInfo,
-			params ColorAttachmentInfo[] colorAttachmentInfos
-		)
-		{
-#if DEBUG
-			AssertValidDepthAttachments(depthStencilAttachmentInfo);
-			AssertValidColorAttachments(colorAttachmentInfos, false);
-#endif
-
-			var refreshColorAttachmentInfos = new Refresh.ColorAttachmentInfo[colorAttachmentInfos.Length];
-
-			for (var i = 0; i < colorAttachmentInfos.Length; i += 1)
-			{
-				refreshColorAttachmentInfos[i] = colorAttachmentInfos[i].ToRefresh();
-			}
-
-			var refreshDepthStencilAttachmentInfo = depthStencilAttachmentInfo.ToRefresh();
-
-			fixed (Refresh.ColorAttachmentInfo* pColorAttachmentInfos = refreshColorAttachmentInfos)
-			{
-				Refresh.Refresh_BeginRenderPass(
-					Device.Handle,
-					Handle,
-					renderArea.ToRefresh(),
 					pColorAttachmentInfos,
 					(uint) colorAttachmentInfos.Length,
 					&refreshDepthStencilAttachmentInfo
@@ -312,6 +231,15 @@ namespace MoonWorks.Graphics
 			GraphicsPipeline graphicsPipeline
 		)
 		{
+#if DEBUG
+			AssertRenderPassActive();
+
+			if (graphicsPipeline.SampleCount != currentSampleCount)
+			{
+				throw new System.ArgumentException("The sample count of the bound GraphicsPipeline must match the sample count of the current render pass!");
+			}
+#endif
+
 			Refresh.Refresh_BindGraphicsPipeline(
 				Device.Handle,
 				Handle,
@@ -1073,6 +1001,8 @@ namespace MoonWorks.Graphics
 				throw new System.ArgumentException("Render pass must contain at least one attachment!");
 			}
 
+			currentSampleCount = (colorAttachmentInfos.Length > 0) ? colorAttachmentInfos[0].SampleCount : SampleCount.One;
+
 			if (colorAttachmentInfos.Length > 4)
 			{
 				throw new System.ArgumentException("Render pass cannot have more than 4 color attachments!");
@@ -1090,10 +1020,15 @@ namespace MoonWorks.Graphics
 				{
 					throw new System.ArgumentException("Render pass color attachment UsageFlags must include TextureUsageFlags.ColorTarget!");
 				}
+
+				if (colorAttachmentInfos[i].SampleCount != currentSampleCount)
+				{
+					throw new System.ArgumentException("All color attachments in a render pass must have the same SampleCount!");
+				}
 			}
 		}
 
-		private void AssertValidDepthAttachments(DepthStencilAttachmentInfo depthStencilAttachmentInfo)
+		private void AssertValidDepthAttachment(DepthStencilAttachmentInfo depthStencilAttachmentInfo)
 		{
 			if (depthStencilAttachmentInfo.Texture == null ||
 				depthStencilAttachmentInfo.Texture.Handle == IntPtr.Zero)

src/Graphics/RefreshEnums.cs

@@ -110,10 +110,7 @@ namespace MoonWorks.Graphics
 		One,
 		Two,
 		Four,
-		Eight,
+		Eight
-		Sixteen,
-		ThirtyTwo,
-		SixtyFour
 	}
 
 	public enum CubeMapFace : uint

src/Graphics/RefreshStructs.cs

@@ -209,25 +209,35 @@ namespace MoonWorks.Graphics
 		public LoadOp LoadOp;
 		public StoreOp StoreOp;
 
-		public ColorAttachmentInfo(Texture texture, Color clearColor, StoreOp storeOp = StoreOp.Store)
+		public ColorAttachmentInfo(
+			Texture texture,
+			Color clearColor,
+			SampleCount sampleCount = SampleCount.One,
+			StoreOp storeOp = StoreOp.Store
+		)
 		{
 			Texture = texture;
 			Depth = 0;
 			Layer = 0;
 			Level = 0;
-			SampleCount = SampleCount.One;
+			SampleCount = sampleCount;
 			ClearColor = clearColor;
 			LoadOp = LoadOp.Clear;
 			StoreOp = storeOp;
 		}
 
-		public ColorAttachmentInfo(Texture texture, LoadOp loadOp = LoadOp.DontCare, StoreOp storeOp = StoreOp.Store)
+		public ColorAttachmentInfo(
+			Texture texture,
+			LoadOp loadOp = LoadOp.DontCare,
+			SampleCount sampleCount = SampleCount.One,
+			StoreOp storeOp = StoreOp.Store
+		)
 		{
 			Texture = texture;
 			Depth = 0;
 			Layer = 0;
 			Level = 0;
-			SampleCount = SampleCount.One;
+			SampleCount = sampleCount;
 			ClearColor = Color.White;
 			LoadOp = loadOp;
 			StoreOp = storeOp;
@@ -344,16 +354,13 @@ namespace MoonWorks.Graphics
 	public struct ColorAttachmentDescription
 	{
 		public TextureFormat Format;
-		public SampleCount SampleCount;
 		public ColorAttachmentBlendState BlendState;
 
 		public ColorAttachmentDescription(
 			TextureFormat format,
-			ColorAttachmentBlendState blendState,
+			ColorAttachmentBlendState blendState
-			SampleCount sampleCount = SampleCount.One
 		) {
 			Format = format;
-			SampleCount = sampleCount;
 			BlendState = blendState;
 		}
 	}

src/Graphics/Resources/GraphicsPipeline.cs

@@ -14,6 +14,7 @@ namespace MoonWorks.Graphics
 
 		public GraphicsShaderInfo VertexShaderInfo { get; }
 		public GraphicsShaderInfo FragmentShaderInfo { get; }
+		internal SampleCount SampleCount { get; }
 
 		public unsafe GraphicsPipeline(
 			GraphicsDevice device,
@@ -46,7 +47,6 @@ namespace MoonWorks.Graphics
 			for (var i = 0; i < attachmentInfo.ColorAttachmentDescriptions.Length; i += 1)
 			{
 				colorAttachmentDescriptions[i].format = (Refresh.TextureFormat) attachmentInfo.ColorAttachmentDescriptions[i].Format;
-				colorAttachmentDescriptions[i].sampleCount = (Refresh.SampleCount) attachmentInfo.ColorAttachmentDescriptions[i].SampleCount;
 				colorAttachmentDescriptions[i].blendState = attachmentInfo.ColorAttachmentDescriptions[i].BlendState.ToRefresh();
 			}
 
@@ -112,6 +112,7 @@ namespace MoonWorks.Graphics
 
 			VertexShaderInfo = vertexShaderInfo;
 			FragmentShaderInfo = fragmentShaderInfo;
+			SampleCount = multisampleState.MultisampleCount;
 		}
 	}
 }

src/Graphics/Resources/Texture.cs

@@ -15,7 +15,6 @@ namespace MoonWorks.Graphics
 		public TextureFormat Format { get; }
 		public bool IsCube { get; }
 		public uint LevelCount { get; }
-		public SampleCount SampleCount { get; }
 		public TextureUsageFlags UsageFlags { get; }
 
 		protected override Action<IntPtr, IntPtr> QueueDestroyFunction => Refresh.Refresh_QueueDestroyTexture;
@@ -46,7 +45,6 @@ namespace MoonWorks.Graphics
 			textureCreateInfo.Format = TextureFormat.R8G8B8A8;
 			textureCreateInfo.IsCube = false;
 			textureCreateInfo.LevelCount = 1;
-			textureCreateInfo.SampleCount = SampleCount.One;
 			textureCreateInfo.UsageFlags = TextureUsageFlags.Sampler;
 
 			var texture = new Texture(device, textureCreateInfo);
@@ -83,12 +81,12 @@ namespace MoonWorks.Graphics
 
 				if (isCube)
 				{
-					texture = CreateTextureCube(graphicsDevice, (uint) width, format, TextureUsageFlags.Sampler, SampleCount.One, (uint) levels);
+					texture = CreateTextureCube(graphicsDevice, (uint) width, format, TextureUsageFlags.Sampler, (uint) levels);
 					faces = 6;
 				}
 				else
 				{
-					texture = CreateTexture2D(graphicsDevice, (uint) width, (uint) height, format, TextureUsageFlags.Sampler, SampleCount.One, (uint) levels);
+					texture = CreateTexture2D(graphicsDevice, (uint) width, (uint) height, format, TextureUsageFlags.Sampler, (uint) levels);
 					faces = 1;
 				}
 
@@ -124,7 +122,6 @@ namespace MoonWorks.Graphics
 		/// <param name="height">The height 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="sampleCount">Specifies the multisample count.</param>
 		/// <param name="levelCount">Specifies the number of mip levels.</param>
 		public static Texture CreateTexture2D(
 			GraphicsDevice device,
@@ -132,7 +129,6 @@ namespace MoonWorks.Graphics
 			uint height,
 			TextureFormat format,
 			TextureUsageFlags usageFlags,
-			SampleCount sampleCount = SampleCount.One,
 			uint levelCount = 1
 		)
 		{
@@ -142,7 +138,6 @@ namespace MoonWorks.Graphics
 				Height = height,
 				Depth = 1,
 				IsCube = false,
-				SampleCount = sampleCount,
 				LevelCount = levelCount,
 				Format = format,
 				UsageFlags = usageFlags
@@ -160,7 +155,6 @@ namespace MoonWorks.Graphics
 		/// <param name="depth">The depth 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="sampleCount">Specifies the multisample count.</param>
 		/// <param name="levelCount">Specifies the number of mip levels.</param>
 		public static Texture CreateTexture3D(
 			GraphicsDevice device,
@@ -169,7 +163,6 @@ namespace MoonWorks.Graphics
 			uint depth,
 			TextureFormat format,
 			TextureUsageFlags usageFlags,
-			SampleCount sampleCount = SampleCount.One,
 			uint levelCount = 1
 		)
 		{
@@ -179,7 +172,6 @@ namespace MoonWorks.Graphics
 				Height = height,
 				Depth = depth,
 				IsCube = false,
-				SampleCount = sampleCount,
 				LevelCount = levelCount,
 				Format = format,
 				UsageFlags = usageFlags
@@ -195,14 +187,12 @@ namespace MoonWorks.Graphics
 		/// <param name="size">The length of one side of the cube.</param>
 		/// <param name="format">The format of the texture.</param>
 		/// <param name="usageFlags">Specifies how the texture will be used.</param>
-		/// <param name="sampleCount">Specifies the multisample count.</param>
 		/// <param name="levelCount">Specifies the number of mip levels.</param>
 		public static Texture CreateTextureCube(
 			GraphicsDevice device,
 			uint size,
 			TextureFormat format,
 			TextureUsageFlags usageFlags,
-			SampleCount sampleCount = SampleCount.One,
 			uint levelCount = 1
 		)
 		{
@@ -212,7 +202,6 @@ namespace MoonWorks.Graphics
 				Height = size,
 				Depth = 1,
 				IsCube = true,
-				SampleCount = sampleCount,
 				LevelCount = levelCount,
 				Format = format,
 				UsageFlags = usageFlags
@@ -241,7 +230,6 @@ namespace MoonWorks.Graphics
 			Height = textureCreateInfo.Height;
 			Depth = textureCreateInfo.Depth;
 			IsCube = textureCreateInfo.IsCube;
-			SampleCount = textureCreateInfo.SampleCount;
 			LevelCount = textureCreateInfo.LevelCount;
 			UsageFlags = textureCreateInfo.UsageFlags;
 		}
@@ -265,7 +253,6 @@ namespace MoonWorks.Graphics
 			Height = height;
 			Depth = 1;
 			IsCube = false;
-			SampleCount = SampleCount.One;
 			LevelCount = 1;
 			UsageFlags = TextureUsageFlags.ColorTarget;
 		}

src/Graphics/State/MultisampleState.cs

@@ -13,5 +13,13 @@
 			MultisampleCount = SampleCount.One,
 			SampleMask = uint.MaxValue
 		};
+
+		public MultisampleState(
+			SampleCount sampleCount,
+			uint sampleMask = uint.MaxValue
+		) {
+			MultisampleCount = sampleCount;
+			SampleMask = sampleMask;
+		}
 	}
 }

src/Graphics/State/TextureCreateInfo.cs

@@ -8,7 +8,6 @@ namespace MoonWorks.Graphics
 		public uint Height;
 		public uint Depth;
 		public bool IsCube;
-		public SampleCount SampleCount;
 		public uint LevelCount;
 		public TextureFormat Format;
 		public TextureUsageFlags UsageFlags;
@@ -21,7 +20,6 @@ namespace MoonWorks.Graphics
 				height = Height,
 				depth = Depth,
 				isCube = Conversions.BoolToByte(IsCube),
-				sampleCount = (Refresh.SampleCount) SampleCount,
 				levelCount = LevelCount,
 				format = (Refresh.TextureFormat) Format,
 				usageFlags = (Refresh.TextureUsageFlags) UsageFlags