pipeline: create pipelines from GraphicsPipelineKey and shader modules

src/graphics/shader/rectListShader.h

@@ -2,20 +2,35 @@
 #define EMULATOR_SRC_GRAPHICS_SHADER_RECTLISTSHADER_H_
 
 #include <cstdint>
+#include <span>
 #include <vector>
 
 namespace Libs::Graphics {
 
 struct ShaderPixelInputInfo;
-struct ShaderVertexInputInfo;
+
+namespace ShaderRecompiler::IR {
+struct CompiledShaderInfo;
+} // namespace ShaderRecompiler::IR
+
+// A pixel parameter the generated stages forward from vertex export input_location.
+struct RectListParameter {
+	uint32_t input_location  = 0;
+	uint32_t output_location = 0;
+	bool     flat            = false;
+};
 
 struct RectListShaders {
 	std::vector<uint32_t> control;
 	std::vector<uint32_t> evaluation;
 };
 
-RectListShaders BuildRectListShaders(const ShaderVertexInputInfo& vertex_info,
-                                     const ShaderPixelInputInfo*  pixel_info);
+// Every parameter a rectangle-list pixel program reads.
+std::vector<RectListParameter> RectListParameters(
+    const ShaderPixelInputInfo& pixel_info, const ShaderRecompiler::IR::CompiledShaderInfo& program);
+// Forwards the parameters the vertex stage exports, one per output location.
+RectListShaders BuildRectListShaders(std::span<const RectListParameter> parameters,
+                                     uint32_t                           param_export_mask);
 
 } // namespace Libs::Graphics