Multipass shaders

apps/RenderCadenceCompositor/runtime/SupportedShaderCatalog.cpp

@@ -9,8 +9,8 @@ namespace RenderCadenceCompositor
 {
 ShaderSupportResult CheckStatelessSinglePassShaderSupport(const ShaderPackage& shaderPackage)
 {
-	if (shaderPackage.passes.size() != 1)
-		return { false, "RenderCadenceCompositor currently supports only single-pass runtime shaders." };
+	if (shaderPackage.passes.empty())
+		return { false, "Shader package has no render passes." };
 
 	if (shaderPackage.temporal.enabled)
 		return { false, "RenderCadenceCompositor currently supports only stateless shaders; temporal history is not enabled in this app." };
@@ -30,6 +30,35 @@ ShaderSupportResult CheckStatelessSinglePassShaderSupport(const ShaderPackage& s
 			return { false, "RenderCadenceCompositor currently skips text parameters because they require per-shader text texture storage." };
 	}
 
+	bool writesLayerOutput = false;
+	for (const ShaderPassDefinition& pass : shaderPackage.passes)
+	{
+		if (pass.sourcePath.empty())
+		{
+			return { false, "Shader pass '" + pass.id + "' has no source." };
+		}
+		if (pass.outputName == "layerOutput")
+			writesLayerOutput = true;
+		for (const std::string& inputName : pass.inputNames)
+		{
+			if (inputName == "videoInput" || inputName == "layerInput")
+				continue;
+			bool matchesNamedOutput = false;
+			for (const ShaderPassDefinition& outputPass : shaderPackage.passes)
+			{
+				if (outputPass.outputName == inputName)
+				{
+					matchesNamedOutput = true;
+					break;
+				}
+			}
+			if (!matchesNamedOutput)
+				return { false, "Shader pass '" + pass.id + "' references unknown input '" + inputName + "'." };
+		}
+	}
+	if (!writesLayerOutput)
+		return { false, "Shader package must write a pass output named 'layerOutput'." };
+
 	return { true, std::string() };
 }