ShaderCompiler.cpp

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/**
* @file ShaderCompiler.cpp.
* @brief The ShaderCompiler Class Implementation.
* @author Spices.
*/
 
#include "Pchheader.h"
#include "ShaderCompiler.h"
#include "ShaderHelper.h"
 
#include <glslc/src/file_includer.h>
#include <libshaderc_util/include/libshaderc_util/file_finder.h>
 
namespace Spices {
 
    void ShaderCompiler::CompileToSPV(const std::string& data, const ShaderStage& stage, const std::string& name, std::vector<uint8_t>& spirv)
    {
        SPICES_PROFILE_ZONE;
 
        /**
        * @brief Instance Compiler.
        */
        shaderc::Compiler compiler;
        shaderc::CompileOptions options;
 
        /**
        * @brief Shader Header Search folder and processer.
        */
        shaderc_util::FileFinder fileFinder;
        fileFinder.search_path().push_back(SPICES_ENGINE_ASSETS_PATH + "Shaders/src");
 
#ifdef SPICES_DEBUG
 
        options.SetGenerateDebugInfo();                                                           // -g
 
#endif
 
        /**
        * @brief Compile Settings.
        */
        options.SetOptimizationLevel(shaderc_optimization_level_performance);                     // -o                                                
        options.SetTargetSpirv(shaderc_spirv_version_1_6);                                        // --target-env=spv1.6
        options.SetTargetEnvironment(shaderc_target_env_vulkan, shaderc_env_version_vulkan_1_3);  // --target-env=vulkan1.3
        options.SetIncluder(std::make_unique<glslc::FileIncluder>(&fileFinder));
 
        /**
        * @brief Runtime Compile.
        */
        shaderc::SpvCompilationResult module = compiler.CompileGlslToSpv(data, ShaderHelper::ToShaderCKind(stage), name.c_str(), options);
        if (module.GetCompilationStatus() != shaderc_compilation_status_success)
        {
            std::stringstream ss;
            ss << "Error compiling module: " << module.GetErrorMessage();
 
            SPICES_CORE_ERROR(ss.str())
        }
 
        /**
        * @brief Get Compiled spirv code.
        */
        std::vector<uint32_t> code32 = { module.cbegin(), module.cend() };
        spirv.resize(code32.size() * 4);
        memcpy(spirv.data(), code32.data(), spirv.size());
    }
}