glsl.cpp

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#include "GLSL/GLSL.hpp"
 
#include <SPIRV/GlslangToSpv.h>
 
std::vector<uint32_t> cae::GLSL::compileGLSLtoSPIRV(const std::string &src, const ShaderStage stage)
{
    static bool glslangInitialized = false;
    if (!glslangInitialized)
    {
        glslang::InitializeProcess();
        glslangInitialized = true;
    }
 
    const EShLanguage lang = shaderStageToESh(stage);
    glslang::TShader shader(lang);
    const char *shaderStrings[1] = {src.c_str()};
    shader.setStrings(shaderStrings, 1);
 
    shader.setEnvInput(glslang::EShSourceGlsl, lang, glslang::EShClientVulkan, VERSION);
    shader.setEnvClient(glslang::EShClientVulkan, glslang::EShTargetVulkan_1_3);
    shader.setEnvTarget(glslang::EShTargetSpv, glslang::EShTargetSpv_1_6);
 
    TBuiltInResource Resources = {};
    Resources.maxLights = 32;
    Resources.maxClipPlanes = 6;
    Resources.maxTextureUnits = 32;
    Resources.maxTextureCoords = 32;
    Resources.maxVertexAttribs = 64;
    Resources.maxVertexUniformComponents = 4096;
    Resources.maxVaryingFloats = 64;
    Resources.maxVertexTextureImageUnits = 32;
    Resources.maxCombinedTextureImageUnits = 80;
    Resources.maxTextureImageUnits = 32;
    Resources.maxFragmentUniformComponents = 4096;
    Resources.maxDrawBuffers = 32;
    Resources.maxVertexUniformVectors = 128;
    Resources.maxVaryingVectors = 8;
    Resources.maxFragmentUniformVectors = 16;
    Resources.maxVertexOutputVectors = 16;
    Resources.maxFragmentInputVectors = 15;
    Resources.minProgramTexelOffset = -8;
    Resources.maxProgramTexelOffset = 7;
    Resources.maxClipDistances = 8;
    Resources.maxComputeWorkGroupCountX = 65535;
    Resources.maxComputeWorkGroupCountY = 65535;
    Resources.maxComputeWorkGroupCountZ = 65535;
    Resources.maxComputeWorkGroupSizeX = 1024;
    Resources.maxComputeWorkGroupSizeY = 1024;
    Resources.maxComputeWorkGroupSizeZ = 64;
    Resources.maxComputeUniformComponents = 1024;
    Resources.maxComputeTextureImageUnits = 16;
    Resources.maxComputeImageUniforms = 8;
    Resources.maxComputeAtomicCounters = 8;
    Resources.maxComputeAtomicCounterBuffers = 1;
    Resources.maxVaryingComponents = 60;
    Resources.maxVertexOutputComponents = 64;
    Resources.maxGeometryInputComponents = 64;
    Resources.maxGeometryOutputComponents = 128;
    Resources.maxFragmentInputComponents = 128;
    Resources.maxImageUnits = 8;
    Resources.maxCombinedImageUnitsAndFragmentOutputs = 8;
    Resources.maxCombinedShaderOutputResources = 8;
 
    constexpr auto messages = static_cast<EShMessages>(EShMsgSpvRules | EShMsgVulkanRules);
 
    if (!shader.parse(&Resources, VERSION, false, messages))
    {
        throw std::runtime_error("GLSL parsing failed: " + std::string(shader.getInfoLog()));
    }
 
    glslang::TProgram program;
    program.addShader(&shader);
 
    if (!program.link(messages))
    {
        throw std::runtime_error("GLSL linking failed: " + std::string(program.getInfoLog()));
    }
 
    std::vector<uint32_t> spirv;
    glslang::GlslangToSpv(*program.getIntermediate(lang), spirv);
 
    return spirv;
}