MobileGL/MobileGL/MG_State/GLState/ProgramState/ShaderObject.cpp

// MobileGL - MobileGL/MG_State/GLState/ProgramState/ShaderObject.cpp
// Copyright (c) 2025-2026 MobileGL-Dev
// Licensed under the GNU Lesser General Public License v3.0:
//   https://www.gnu.org/licenses/gpl-3.0.txt
//   https://www.gnu.org/licenses/lgpl-3.0.txt
// SPDX-License-Identifier: LGPL-3.0-only
// End of Source File Header

#include "ShaderObject.h"
#include <MG_Util/ShaderTranspiler/Types.h>
#include <MG_Util/ShaderTranspiler/ShaderCompiler.h>
#include <MG_Util/Converters/MGToGL/ProgramEnumConverter.h>
#include <MG_Util/ShaderTranspiler/ShaderSourceProcessor.h>
#include <MG_Util/ShaderTranspiler/glslang/UniformTraverser.h>

namespace MobileGL::MG_State::GLState {
    void ShaderObject::SetShaderSource(const String& source) {
        m_source = source;
        m_shader.reset();
        m_compileStatus = false;
        m_infoLog.clear();
    }

    void ShaderObject::SetShaderSource(String&& source) {
        m_source = Move(source);
        m_shader.reset();
        m_compileStatus = false;
        m_infoLog.clear();
    }

    void ShaderObject::Compile() {
        using namespace MG_Util::ShaderTranspiler;
        String compileSource = m_source;
        MG_Util::ShaderTranspiler::PreprocessShaderSource(m_stage, compileSource);

        // Compile for OpenGL here, so that we can do validation and link
        // like a real OpenGL driver at linking stage
        // Will compile for other backends later.
        ShaderAttrib attrib{.shaderType = MG_Util::ConvertShaderStageToGLEnum(m_stage),
                            .sourceStr = compileSource,
                            .flags = ShaderCompileBits::CompileForOpenGL};

        auto result = ShaderCompiler::CompileShader(attrib);
        if (result) {
            m_compileStatus = true;
            m_shader = result.value();
            m_infoLog.clear();
        } else {
            m_compileStatus = false;
            m_shader.reset();
            m_infoLog = result.error().log;
            MGLOG_D("ShaderObject::Compile: Shader %d compilation failed.\nSource:\n%s\nInfoLog:\n%s\nSetting "
                    "m_compileStatus = false as a result.",
                    m_externalIndex, compileSource.c_str(), m_infoLog.c_str());
        }
    }

    void ShaderObject::MarkAsDeleted() {
        m_deleteStatus = true;
    }
} // namespace MobileGL::MG_State::GLState