renderer_vulkan: Initialize SPIRV vertex shaders

Defines shaders as an array of `u32` rather than a GLSL string.
Uses a hash of the `u32` bytes rather than `std::string`

src/video_core/CMakeLists.txt

@@ -77,6 +77,10 @@ add_library(video_core STATIC
     shader/generator/shader_gen.h
     shader/generator/shader_uniforms.cpp
     shader/generator/shader_uniforms.h
+    shader/generator/spv_fs_shader_gen.cpp
+    shader/generator/spv_fs_shader_gen.h
+    shader/generator/spv_shader_gen.h
+    shader/generator/spv_shader_gen.cpp
     shader/shader.cpp
     shader/shader.h
     shader/shader_interpreter.cpp

src/video_core/renderer_vulkan/vk_graphics_pipeline.h

@@ -160,7 +160,7 @@ struct Shader : public Common::AsyncHandle {
 
     vk::ShaderModule module;
     vk::Device device;
-    std::string program;
+    std::vector<u32> program;
 };
 
 class GraphicsPipeline : public Common::AsyncHandle {

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -19,6 +19,7 @@
 #include "video_core/shader/generator/glsl_fs_shader_gen.h"
 #include "video_core/shader/generator/glsl_shader_gen.h"
 #include "video_core/shader/generator/spv_fs_shader_gen.h"
+#include "video_core/shader/generator/spv_shader_gen.h"
 
 using namespace Pica::Shader::Generator;
 using Pica::Shader::FSConfig;
@@ -404,21 +405,37 @@ bool PipelineCache::UseProgrammableVertexShader(const Pica::RegsInternal& regs,
 
     auto [it, new_config] = programmable_vertex_map.try_emplace(config);
     if (new_config) {
-        auto program = GLSL::GenerateVertexShader(setup, config, true);
+        const bool use_spirv = Settings::values.spirv_shader_gen.GetValue();
+        const vk::Device device = instance.GetDevice();
+
+        std::vector<u32> code;
+
+        // Disabled for programmable shaders for now
+        if (use_spirv && false) {
+            // Directly generate SPIRV
+            code = SPIRV::GenerateVertexShader(setup, config, profile);
+        } else {
+            // Generate GLSL
+            const std::string program = GLSL::GenerateVertexShader(setup, config, true);
             if (program.empty()) {
                 LOG_ERROR(Render_Vulkan, "Failed to retrieve programmable vertex shader");
                 programmable_vertex_map[config] = nullptr;
                 return false;
             }
+            // Compile GLSL to SPIRV
+            code = CompileGLSLtoSPIRV(program, vk::ShaderStageFlagBits::eVertex, device);
+        }
 
-        auto [iter, new_program] = programmable_vertex_cache.try_emplace(program, instance);
+        const u64 code_hash = Common::ComputeHash64(std::as_bytes(std::span(code)));
+
+        auto [iter, new_program] = programmable_vertex_cache.try_emplace(code_hash, instance);
         auto& shader = iter->second;
 
+        // Queue worker thread to create shader module
         if (new_program) {
-            shader.program = std::move(program);
+            shader.program = std::move(code);
-            const vk::Device device = instance.GetDevice();
             workers.QueueWork([device, &shader] {
-                shader.module = Compile(shader.program, vk::ShaderStageFlagBits::eVertex, device);
+                shader.module = CompileSPV(shader.program, device);
                 shader.MarkDone();
             });
         }

src/video_core/renderer_vulkan/vk_pipeline_cache.h

@@ -119,7 +119,7 @@ private:
     std::array<u64, MAX_SHADER_STAGES> shader_hashes;
     std::array<Shader*, MAX_SHADER_STAGES> current_shaders;
     std::unordered_map<Pica::Shader::Generator::PicaVSConfig, Shader*> programmable_vertex_map;
-    std::unordered_map<std::string, Shader> programmable_vertex_cache;
+    std::unordered_map<u64, Shader> programmable_vertex_cache;
     std::unordered_map<Pica::Shader::Generator::PicaFixedGSConfig, Shader> fixed_geometry_shaders;
     std::unordered_map<Pica::Shader::FSConfig, Shader> fragment_shaders;
     Shader trivial_vertex_shader;

src/video_core/shader/generator/spv_fs_shader_gen.h

@@ -7,6 +7,7 @@
 #include <array>
 #include <sirit/sirit.h>
 
+#include "spv_shader_gen.h"
 #include "video_core/pica/regs_framebuffer.h"
 #include "video_core/pica/regs_texturing.h"
 
@@ -19,15 +20,6 @@ namespace Pica::Shader::Generator::SPIRV {
 
 using Sirit::Id;
 
-struct VectorIds {
-    /// Returns the type id of the vector with the provided size
-    [[nodiscard]] constexpr Id Get(u32 size) const {
-        return ids[size - 2];
-    }
-
-    std::array<Id, 3> ids;
-};
-
 class FragmentModule : public Sirit::Module {
     static constexpr u32 NUM_TEV_STAGES = 6;
     static constexpr u32 NUM_LIGHTS = 8;

src/video_core/shader/generator/spv_shader_gen.cpp

@@ -0,0 +1,68 @@
+// Copyright 2024 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "video_core/pica/regs_rasterizer.h"
+#include "video_core/shader/generator/shader_gen.h"
+// #include "video_core/shader/generator/spv_shader_decompiler.h"
+#include "video_core/shader/generator/spv_shader_gen.h"
+
+using VSOutputAttributes = Pica::RasterizerRegs::VSOutputAttributes;
+
+namespace Pica::Shader::Generator::SPIRV {
+
+constexpr u32 SPIRV_VERSION_1_3 = 0x00010300;
+
+VertexModule::VertexModule(const PicaVSConfig& config_, const Profile& profile_)
+    : Sirit::Module{SPIRV_VERSION_1_3}, config{config_}, profile{profile_} {
+    DefineArithmeticTypes();
+    DefineInterface();
+    DefineEntryPoint();
+}
+
+VertexModule::~VertexModule() = default;
+
+void VertexModule::Generate() {
+    AddLabel(OpLabel());
+    OpReturn();
+    OpFunctionEnd();
+}
+
+void VertexModule::DefineArithmeticTypes() {
+    void_id = Name(TypeVoid(), "void_id");
+    bool_id = Name(TypeBool(), "bool_id");
+    f32_id = Name(TypeFloat(32), "f32_id");
+    i32_id = Name(TypeSInt(32), "i32_id");
+    u32_id = Name(TypeUInt(32), "u32_id");
+
+    for (u32 size = 2; size <= 4; size++) {
+        const u32 i = size - 2;
+        vec_ids.ids[i] = Name(TypeVector(f32_id, size), fmt::format("vec{}_id", size));
+        ivec_ids.ids[i] = Name(TypeVector(i32_id, size), fmt::format("ivec{}_id", size));
+        uvec_ids.ids[i] = Name(TypeVector(u32_id, size), fmt::format("uvec{}_id", size));
+        bvec_ids.ids[i] = Name(TypeVector(bool_id, size), fmt::format("bvec{}_id", size));
+    }
+}
+
+void VertexModule::DefineEntryPoint() {
+    AddCapability(spv::Capability::Shader);
+    SetMemoryModel(spv::AddressingModel::Logical, spv::MemoryModel::GLSL450);
+
+    const Id main_type{TypeFunction(TypeVoid())};
+    const Id main_func{OpFunction(TypeVoid(), spv::FunctionControlMask::MaskNone, main_type)};
+
+    AddEntryPoint(spv::ExecutionModel::Vertex, main_func, "main");
+}
+
+void VertexModule::DefineInterface() {
+    // Define interface block
+}
+
+std::vector<u32> GenerateVertexShader(const ShaderSetup& setup, const PicaVSConfig& config,
+                                      const Profile& profile) {
+    VertexModule module(config, profile);
+    module.Generate();
+    return module.Assemble();
+}
+
+} // namespace Pica::Shader::Generator::SPIRV

src/video_core/shader/generator/spv_shader_gen.h

@@ -0,0 +1,74 @@
+// Copyright 2024 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <sirit/sirit.h>
+
+namespace Pica {
+struct ShaderSetup;
+}
+
+namespace Pica::Shader {
+struct VSConfig;
+struct Profile;
+} // namespace Pica::Shader
+
+namespace Pica::Shader::Generator {
+struct PicaVSConfig;
+} // namespace Pica::Shader::Generator
+
+namespace Pica::Shader::Generator::SPIRV {
+
+using Sirit::Id;
+
+struct VectorIds {
+    /// Returns the type id of the vector with the provided size
+    [[nodiscard]] constexpr Id Get(u32 size) const {
+        return ids[size - 2];
+    }
+
+    std::array<Id, 3> ids;
+};
+
+class VertexModule : public Sirit::Module {
+
+public:
+    explicit VertexModule(const PicaVSConfig& config, const Profile& profile);
+    ~VertexModule();
+
+    /// Emits SPIR-V bytecode corresponding to the provided pica vertex configuration
+    void Generate();
+
+private:
+    void DefineArithmeticTypes();
+    void DefineEntryPoint();
+    void DefineInterface();
+
+private:
+    const PicaVSConfig& config;
+    const Profile& profile;
+
+    Id void_id{};
+    Id bool_id{};
+    Id f32_id{};
+    Id i32_id{};
+    Id u32_id{};
+
+    VectorIds vec_ids{};
+    VectorIds ivec_ids{};
+    VectorIds uvec_ids{};
+    VectorIds bvec_ids{};
+};
+
+/**
+ * Generates the SPIRV vertex shader program source code for the given VS program
+ * @param config ShaderCacheKey object generated for the current Pica state, used for the shader
+ *               configuration (NOTE: Use state in this struct only, not the Pica registers!)
+ * @param separable_shader generates shader that can be used for separate shader object
+ * @returns String of the shader source code; empty on failure
+ */
+std::vector<u32> GenerateVertexShader(const Pica::ShaderSetup& setup, const PicaVSConfig& config,
+                                      const Profile& profile);
+} // namespace Pica::Shader::Generator::SPIRV