axmol/cocos/renderer/backend/opengl/ShaderModuleGL.cpp

/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2020 c4games.com.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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#include "ShaderModuleGL.h"

#include "platform/CCPlatformMacros.h"
#include "base/ccMacros.h"
#include "base/CCData.h"

CC_BACKEND_BEGIN

ShaderModuleGL::ShaderModuleGL(ShaderStage stage, std::string_view source) : ShaderModule(stage)
{
    compileShader(stage, source);
}

ShaderModuleGL::~ShaderModuleGL()
{
    deleteShader();
}

void ShaderModuleGL::compileShader(ShaderStage stage, std::string_view source)
{
    GLenum shaderType       = stage == ShaderStage::VERTEX ? GL_VERTEX_SHADER : GL_FRAGMENT_SHADER;
    const GLchar* sourcePtr = reinterpret_cast<const GLchar*>(source.data());
    _shader                 = glCreateShader(shaderType);
    if (!_shader)
        return;

    glShaderSource(_shader, 1, &sourcePtr, nullptr);
    glCompileShader(_shader);

    GLint status = 0;
    glGetShaderiv(_shader, GL_COMPILE_STATUS, &status);
    if (!status)
    {
        GLint logLength = 0;
        glGetShaderiv(_shader, GL_INFO_LOG_LENGTH, &logLength);

        if (logLength > 1)
        {
            cocos2d::Data errorLog{};
            glGetShaderInfoLog(_shader, logLength, nullptr, (GLchar*)errorLog.resize(logLength));
            cocos2d::log("cocos2d: ERROR: Failed to compile shader, detail: %s\n%s", errorLog.getBytes(),
                         source.data());
        }
        else
        {
            cocos2d::log("cocos2d: ERROR: Failed to compile shader without errors.");
        }

        deleteShader();
        CCASSERT(false, "Shader compile failed!");
    }
}

void ShaderModuleGL::deleteShader()
{
    if (_shader)
    {
        glDeleteShader(_shader);
        _shader = 0;
    }
}

CC_BACKEND_END