make video shaders optional and search for them in the root output directory

Co-authored-by: Caleb Cornett <caleb.cornett@outlook.com>
Reviewed-on: MoonsideGames/MoonWorks#41
Co-authored-by: TheSpydog <thespydog@noreply.example.org>
Co-committed-by: TheSpydog <thespydog@noreply.example.org>

MoonWorks.csproj

@@ -24,13 +24,4 @@
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 		</None>
 	</ItemGroup>
-
-	<ItemGroup>
-		<EmbeddedResource Include="src\Video\Shaders\Compiled\FullscreenVert.spv">
-			<LogicalName>MoonWorks.Shaders.FullscreenVert.spv</LogicalName>
-		</EmbeddedResource>
-		<EmbeddedResource Include="src\Video\Shaders\Compiled\YUV2RGBAFrag.spv">
-			<LogicalName>MoonWorks.Shaders.YUV2RGBAFrag.spv</LogicalName>
-		</EmbeddedResource>
-	</ItemGroup>
 </Project>

src/Graphics/GraphicsDevice.cs

@@ -14,8 +14,6 @@ namespace MoonWorks.Graphics
 		public SDL2.SDL.SDL_WindowFlags WindowFlags => (SDL2.SDL.SDL_WindowFlags) windowFlags;
 
 		// Built-in video pipeline
-		private ShaderModule VideoVertexShader { get; }
-		private ShaderModule VideoFragmentShader { get; }
 		internal GraphicsPipeline VideoPipeline { get; }
 
 		public bool IsDisposed { get; private set; }
@@ -25,8 +23,7 @@ namespace MoonWorks.Graphics
 		public GraphicsDevice(
 			Backend preferredBackend,
 			bool debugMode
-		)
-		{
+		) {
 			Backend = (Backend) Refresh.Refresh_SelectBackend((Refresh.Backend) preferredBackend, out windowFlags);
 
 			if (Backend == Backend.Invalid)
@@ -38,19 +35,36 @@ namespace MoonWorks.Graphics
 				Conversions.BoolToByte(debugMode)
 			);
 
-			VideoVertexShader = new ShaderModule(this, GetEmbeddedResource("MoonWorks.Shaders.FullscreenVert.spv"));
-			VideoFragmentShader = new ShaderModule(this, GetEmbeddedResource("MoonWorks.Shaders.YUV2RGBAFrag.spv"));
+			// Check for optional video shaders
+			string basePath = SDL2.SDL.SDL_GetBasePath();
+			string videoVertPath = Path.Combine(basePath, "Fullscreen.refresh");
+			string videoFragPath = Path.Combine(basePath, "YUV2RGBA.refresh");
+			if (File.Exists(videoVertPath) && File.Exists(videoFragPath))
+			{
+				ShaderModule videoVertShader = new ShaderModule(this, videoVertPath);
+				ShaderModule videoFragShader = new ShaderModule(this, videoFragPath);
 
 				VideoPipeline = new GraphicsPipeline(
 					this,
 					new GraphicsPipelineCreateInfo
 					{
 						AttachmentInfo = new GraphicsPipelineAttachmentInfo(
-						new ColorAttachmentDescription(TextureFormat.R8G8B8A8, ColorAttachmentBlendState.None)
+							new ColorAttachmentDescription(
+								TextureFormat.R8G8B8A8,
+								ColorAttachmentBlendState.None
+							)
 						),
 						DepthStencilState = DepthStencilState.Disable,
-					VertexShaderInfo = GraphicsShaderInfo.Create(VideoVertexShader, "main", 0),
-					FragmentShaderInfo = GraphicsShaderInfo.Create(VideoFragmentShader, "main", 3),
+						VertexShaderInfo = GraphicsShaderInfo.Create(
+							videoVertShader,
+							"main",
+							0
+						),
+						FragmentShaderInfo = GraphicsShaderInfo.Create(
+							videoFragShader,
+							"main",
+							3
+						),
 						VertexInputState = VertexInputState.Empty,
 						RasterizerState = RasterizerState.CCW_CullNone,
 						PrimitiveType = PrimitiveType.TriangleList,
@@ -58,6 +72,7 @@ namespace MoonWorks.Graphics
 					}
 				);
 			}
+		}
 
 		public bool ClaimWindow(Window window, PresentMode presentMode)
 		{
@@ -102,7 +117,7 @@ namespace MoonWorks.Graphics
 
 		public CommandBuffer AcquireCommandBuffer()
 		{
-			return new CommandBuffer(this, Refresh.Refresh_AcquireCommandBuffer(Handle, 0));
+			return new CommandBuffer(this, Refresh.Refresh_AcquireCommandBuffer(Handle));
 		}
 
 		public unsafe void Submit(CommandBuffer commandBuffer)
@@ -214,11 +229,6 @@ namespace MoonWorks.Graphics
 			}
 		}
 
-		private static Stream GetEmbeddedResource(string name)
-		{
-			return typeof(GraphicsDevice).Assembly.GetManifestResourceStream(name);
-		}
-
 		protected virtual void Dispose(bool disposing)
 		{
 			if (!IsDisposed)

src/Graphics/Resources/ShaderModule.cs

@@ -5,7 +5,7 @@ using System.IO;
 namespace MoonWorks.Graphics
 {
 	/// <summary>
-	/// Shader modules expect input in SPIR-V bytecode format.
+	/// Shader modules expect input in Refresh bytecode format.
 	/// </summary>
 	public class ShaderModule : GraphicsResource
 	{

src/Video/VideoPlayer.cs

@@ -50,6 +50,11 @@ namespace MoonWorks.Video
 		public VideoPlayer(GraphicsDevice graphicsDevice, AudioDevice audioDevice)
 		{
 			GraphicsDevice = graphicsDevice;
+			if (GraphicsDevice.VideoPipeline == null)
+			{
+				throw new InvalidOperationException("Missing video shaders!");
+			}
+
 			AudioDevice = audioDevice;
 			LinearSampler = new Sampler(graphicsDevice, SamplerCreateInfo.LinearClamp);