compile_glsl_to_spirv()

std::vector< uint32_t > MayaFlux::Core::VKShaderModule::compile_glsl_to_spirv ( const std::string &  glsl_source, vk::ShaderStageFlagBits  stage, const std::vector< std::string > &  include_directories, const std::unordered_map< std::string, std::string > &  defines  )

private

Compile GLSL to SPIR-V using shaderc.

Parameters

glsl_source	GLSL source code
stage	Shader stage (affects compiler settings)
include_directories	Include paths
defines	Preprocessor macros

Returns

SPIR-V bytecode, or empty vector on failure

Definition at line 485 of file VKShaderModule.cpp.

{
#ifdef MAYAFLUX_USE_SHADERC
    shaderc::Compiler compiler;
    shaderc::CompileOptions options;
 
    options.SetOptimizationLevel(shaderc_optimization_level_performance);
 
    for (const auto& dir : include_directories) {
        // options.AddIncludeDirectory(dir);
    }
 
    for (const auto& [name, value] : defines) {
        options.AddMacroDefinition(name, value);
    }
 
    shaderc_shader_kind shader_kind;
    switch (stage) {
    case vk::ShaderStageFlagBits::eVertex:
        shader_kind = shaderc_glsl_vertex_shader;
        break;
    case vk::ShaderStageFlagBits::eFragment:
        shader_kind = shaderc_glsl_fragment_shader;
        break;
    case vk::ShaderStageFlagBits::eCompute:
        shader_kind = shaderc_glsl_compute_shader;
        break;
    case vk::ShaderStageFlagBits::eGeometry:
        shader_kind = shaderc_glsl_geometry_shader;
        break;
    case vk::ShaderStageFlagBits::eTessellationControl:
        shader_kind = shaderc_glsl_tess_control_shader;
        break;
    case vk::ShaderStageFlagBits::eTessellationEvaluation:
        shader_kind = shaderc_glsl_tess_evaluation_shader;
        break;
    default:
        MF_ERROR(Journal::Component::Core, Journal::Context::GraphicsBackend,
            "Unsupported shader stage for GLSL compilation: {}", vk::to_string(stage));
        return {};
    }
 
    shaderc::SpvCompilationResult result = compiler.CompileGlslToSpv(
        glsl_source,
        shader_kind,
        "shader.glsl",
        options);
 
    if (result.GetCompilationStatus() != shaderc_compilation_status_success) {
        MF_ERROR(Journal::Component::Core, Journal::Context::GraphicsBackend,
            "GLSL compilation failed:\n{}", result.GetErrorMessage());
        return {};
    }
 
    std::vector<uint32_t> spirv(result.cbegin(), result.cend());
 
    MF_DEBUG(Journal::Component::Core, Journal::Context::GraphicsBackend,
        "Compiled GLSL ({} stage) -> {} bytes SPIR-V",
        vk::to_string(stage), spirv.size() * 4);
 
    return spirv;
 
#else
    MF_ERROR(Journal::Component::Core, Journal::Context::GraphicsBackend,
        "GLSL compilation requested but shaderc not available - use pre-compiled SPIR-V");
    return {};
#endif
}

References MayaFlux::Journal::Core, MayaFlux::Journal::GraphicsBackend, MF_DEBUG, and MF_ERROR.

Referenced by create_from_glsl().

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