Initial commit

src/graphics/shader/recompiler/SrtWalker.h

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+#ifndef EMULATOR_INCLUDE_EMULATOR_GRAPHICS_SHADER_RECOMPILER_SRTWALKER_H_
+#define EMULATOR_INCLUDE_EMULATOR_GRAPHICS_SHADER_RECOMPILER_SRTWALKER_H_
+
+#include "graphics/shader/recompiler/ShaderIR.h"
+
+#include <optional>
+#include <span>
+
+namespace Libs::Graphics::ShaderRecompiler::IR {
+
+using SrtMemoryReader = bool (*)(void* userdata, uint64_t address, uint32_t* value);
+
+struct SrtRuntime {
+	std::span<const uint32_t> user_data;
+	uint64_t                  shader_base = 0;
+	SrtMemoryReader           read_memory = nullptr;
+	void*                     userdata    = nullptr;
+	std::optional<uint64_t>   flat_memory_base;
+};
+
+struct DescriptorSourceRequest {
+	uint32_t source = 0;
+	uint32_t use_pc = 0;
+};
+
+bool FoldScalarConstant(const ScalarProvenance& provenance, uint32_t value, uint32_t* result);
+
+// Collects reachable ReadConst values. Immediate offsets receive compact flat-buffer slots;
+// dynamic offsets remain explicit and are never assigned a fake slot.
+bool BuildSrtPlan(Program* program, std::string* error);
+
+bool EvaluateDescriptorSource(const Program& program, uint32_t source, uint32_t use_pc,
+                              const SrtRuntime& runtime, DescriptorValue* result,
+                              std::string* error);
+
+// Evaluates one runtime snapshot transactionally. Scalar values and ReadConst results shared by
+// several descriptors are memoized once across the batch.
+bool EvaluateDescriptorSources(const Program&                           program,
+                               std::span<const DescriptorSourceRequest> requests,
+                               const SrtRuntime& runtime, std::vector<DescriptorValue>* results,
+                               std::string* error);
+
+// Evaluates descriptor sources and the flattened immediate SRT with one memoized scalar walk.
+// On failure neither destination is changed.
+bool EvaluateRuntimeSources(const Program&                           program,
+                            std::span<const DescriptorSourceRequest> requests,
+                            const SrtRuntime& runtime, std::vector<DescriptorValue>* results,
+                            std::vector<uint32_t>* flat, std::string* error);
+
+bool WalkSrt(const Program& program, const SrtRuntime& runtime, std::vector<uint32_t>* flat,
+             std::string* error);
+
+} // namespace Libs::Graphics::ShaderRecompiler::IR
+
+#endif /* EMULATOR_INCLUDE_EMULATOR_GRAPHICS_SHADER_RECOMPILER_SRTWALKER_H_ */