Implement Shader IR Cache

This implements the first step of a full shader cache with caching any IR by treating the shared pointer as a handle and key for an associative map alongside hashing the Maxwell shader bytecode, it supports both single shader program and dual vertex program caching.

app/src/main/cpp/skyline/gpu/shader_manager.cpp

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 // Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
 
+#include <boost/functional/hash.hpp>
 #include <gpu.h>
 #include <shader_compiler/common/settings.h>
 #include <shader_compiler/common/log.h>
@@ -168,17 +169,32 @@ namespace skyline::gpu {
     ShaderManager::DualVertexShaderProgram::DualVertexShaderProgram(Shader::IR::Program ir, std::shared_ptr<ShaderProgram> vertexA, std::shared_ptr<ShaderProgram> vertexB) : ShaderProgram{std::move(ir)}, vertexA(std::move(vertexA)), vertexB(std::move(vertexB)) {}
 
     std::shared_ptr<ShaderManager::ShaderProgram> ShaderManager::ParseGraphicsShader(Shader::Stage stage, span<u8> binary, u32 baseOffset, u32 bindlessTextureConstantBufferIndex) {
-        auto program{std::make_shared<SingleShaderProgram>()};
+        auto &program{programCache[binary]};
+        if (program)
+            return program;
+
+        program = std::make_shared<SingleShaderProgram>();
         GraphicsEnvironment environment{stage, binary, baseOffset, bindlessTextureConstantBufferIndex};
         Shader::Maxwell::Flow::CFG cfg(environment, program->flowBlockPool, Shader::Maxwell::Location{static_cast<u32>(baseOffset + sizeof(Shader::ProgramHeader))});
-
         program->program = Shader::Maxwell::TranslateProgram(program->instructionPool, program->blockPool, environment, cfg, hostTranslateInfo);
         return program;
     }
 
+    constexpr size_t ShaderManager::DualVertexProgramsHash::operator()(const std::pair<std::shared_ptr<ShaderProgram>, std::shared_ptr<ShaderProgram>> &p) const {
+        size_t hash{};
+        boost::hash_combine(hash, p.first);
+        boost::hash_combine(hash, p.second);
+        return hash;
+    }
+
     std::shared_ptr<ShaderManager::ShaderProgram> ShaderManager::CombineVertexShaders(const std::shared_ptr<ShaderManager::ShaderProgram> &vertexA, const std::shared_ptr<ShaderManager::ShaderProgram> &vertexB, span<u8> vertexBBinary) {
+        auto &program{dualProgramCache[DualVertexPrograms{vertexA, vertexB}]};
+        if (program)
+            return program;
+
         VertexBEnvironment vertexBEnvironment{vertexBBinary};
-        return std::make_shared<DualVertexShaderProgram>(Shader::Maxwell::MergeDualVertexPrograms(vertexA->program, vertexB->program, vertexBEnvironment), vertexA, vertexB);
+        program = std::make_shared<DualVertexShaderProgram>(Shader::Maxwell::MergeDualVertexPrograms(vertexA->program, vertexB->program, vertexBEnvironment), vertexA, vertexB);
+        return program;
     }
 
     vk::raii::ShaderModule ShaderManager::CompileShader(Shader::RuntimeInfo &runtimeInfo, const std::shared_ptr<ShaderProgram> &program, Shader::Backend::Bindings &bindings) {

app/src/main/cpp/skyline/gpu/shader_manager.h

@@ -43,6 +43,8 @@ namespace skyline::gpu {
             SingleShaderProgram &operator=(const SingleShaderProgram &) = delete;
         };
 
+        std::unordered_map<span<u8>, std::shared_ptr<SingleShaderProgram>, SpanHash<u8>, SpanEqual<u8>> programCache; //!< A map from Maxwell bytecode to the corresponding shader program
+
         struct DualVertexShaderProgram : ShaderProgram {
             std::shared_ptr<ShaderProgram> vertexA;
             std::shared_ptr<ShaderProgram> vertexB;
@@ -54,6 +56,14 @@ namespace skyline::gpu {
             DualVertexShaderProgram &operator=(const DualVertexShaderProgram &) = delete;
         };
 
+        using DualVertexPrograms = std::pair<std::shared_ptr<ShaderProgram>, std::shared_ptr<ShaderProgram>>;
+
+        struct DualVertexProgramsHash {
+            constexpr size_t operator()(const std::pair<std::shared_ptr<ShaderProgram>, std::shared_ptr<ShaderProgram>> &p) const;
+        };
+
+        std::unordered_map<DualVertexPrograms, std::shared_ptr<DualVertexShaderProgram>, DualVertexProgramsHash> dualProgramCache; //!< A map from Vertex A and Vertex B shader programs to the corresponding dual vertex shader program
+
       public:
         ShaderManager(const DeviceState &state, GPU &gpu);
 
@@ -63,7 +73,7 @@ namespace skyline::gpu {
          * @brief Combines the VertexA and VertexB shader programs into a single program
          * @note VertexA/VertexB shader programs must be SingleShaderProgram and not DualVertexShaderProgram
          */
-        static std::shared_ptr<ShaderManager::ShaderProgram> CombineVertexShaders(const std::shared_ptr<ShaderProgram> &vertexA, const std::shared_ptr<ShaderProgram> &vertexB, span <u8> vertexBBinary);
+        std::shared_ptr<ShaderManager::ShaderProgram> CombineVertexShaders(const std::shared_ptr<ShaderProgram> &vertexA, const std::shared_ptr<ShaderProgram> &vertexB, span<u8> vertexBBinary);
 
         vk::raii::ShaderModule CompileShader(Shader::RuntimeInfo &runtimeInfo, const std::shared_ptr<ShaderProgram> &program, Shader::Backend::Bindings &bindings);
     };