Method ReflectProgramOutputs

GTE/Graphics/GL46/GLSLReflection.cpp:423–494

}

void GLSLReflection::ReflectProgramOutputs()
{
    GLint numResources = 0;
    glGetProgramInterfaceiv(mHandle, GL_PROGRAM_OUTPUT, GL_ACTIVE_RESOURCES, &numResources);
    if (numResources > 0)
    {
        mOutputs.resize(numResources);

        enum
        {
            IDX_NAME_LENGTH,
            IDX_TYPE,
            IDX_LOCATION,
            IDX_ARRAY_SIZE,
            IDX_REFERENCED_BY_VERTEX_SHADER,
            IDX_REFERENCED_BY_GEOMETRY_SHADER,
            IDX_REFERENCED_BY_FRAGMENT_SHADER,
            IDX_REFERENCED_BY_COMPUTE_SHADER,
            IDX_REFERENCED_BY_TESS_CONTROL_SHADER,
            IDX_REFERENCED_BY_TESS_EVALUATION_SHADER,
            IDX_IS_PER_PATCH,
            IDX_LOCATION_COMPONENT,
            IDX_LOCATION_INDEX
        };

        std::vector<GLenum> const properties =
        {
            GL_NAME_LENGTH,
            GL_TYPE,
            GL_LOCATION,
            GL_ARRAY_SIZE,
            GL_REFERENCED_BY_VERTEX_SHADER,
            GL_REFERENCED_BY_GEOMETRY_SHADER,
            GL_REFERENCED_BY_FRAGMENT_SHADER,
            GL_REFERENCED_BY_COMPUTE_SHADER,
            GL_REFERENCED_BY_TESS_CONTROL_SHADER,
            GL_REFERENCED_BY_TESS_EVALUATION_SHADER,
            GL_IS_PER_PATCH,
            GL_LOCATION_COMPONENT,
            GL_LOCATION_INDEX
        };

        GLsizei const numProperties = static_cast<GLsizei>(properties.size());

        std::vector<GLint> results(properties.size(), 0);
        for (int32_t i = 0; i < numResources; ++i)
        {
            glGetProgramResourceiv(mHandle, GL_PROGRAM_OUTPUT, i, numProperties,
                properties.data(), numProperties, nullptr, results.data());

            GLsizei const numBytes = static_cast<GLsizei>(results[IDX_NAME_LENGTH] + 1);
            std::vector<GLchar> name(numBytes);
            glGetProgramResourceName(mHandle, GL_PROGRAM_OUTPUT, i, numBytes,
                nullptr, name.data());

            Output& info = mOutputs[i];
            info.name = std::string(name.data());
            info.type = results[IDX_TYPE];