RedCore/cocos2d/cocos/2d/CCGLBufferedNode.cpp

/****************************************************************************
Copyright (c) 2013      Zynga Inc.
Copyright (c) 2013-2017 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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#include "2d/CCGLBufferedNode.h"

GLBufferedNode::GLBufferedNode()
{
    for(int i = 0; i < BUFFER_SLOTS; i++)
    {
        _bufferObject[i] = 0;
        _bufferSize[i] = 0;
        _indexBufferObject[i] = 0;
        _indexBufferSize[i] = 0;
    }
}

GLBufferedNode::~GLBufferedNode()
{
    for(int i = 0; i < BUFFER_SLOTS; i++)
    {
        if(_bufferSize[i])
        {
            glDeleteBuffers(1, &(_bufferObject[i]));
        }
        if(_indexBufferSize[i])
        {
            glDeleteBuffers(1, &(_indexBufferObject[i]));
        }
    }
}

void GLBufferedNode::setGLBufferData(void *buf, GLuint bufSize, int slot)
{
    // WebGL doesn't support client-side arrays, so generate a buffer and load the data first.
    if(_bufferSize[slot] < bufSize)
    {
        if(_bufferObject[slot])
        {
            glDeleteBuffers(1, &(_bufferObject[slot]));
        }
        glGenBuffers(1, &(_bufferObject[slot]));
        _bufferSize[slot] = bufSize;

        glBindBuffer(GL_ARRAY_BUFFER, _bufferObject[slot]);
        glBufferData(GL_ARRAY_BUFFER, bufSize, buf, GL_DYNAMIC_DRAW);
    }
    else
    {
        glBindBuffer(GL_ARRAY_BUFFER, _bufferObject[slot]);
        glBufferSubData(GL_ARRAY_BUFFER, 0, bufSize, buf);
    }
}

void GLBufferedNode::setGLIndexData(void *buf, GLuint bufSize, int slot)
{
    // WebGL doesn't support client-side arrays, so generate a buffer and load the data first.
    if(_indexBufferSize[slot] < bufSize)
    {
        if(_indexBufferObject[slot])
        {
            glDeleteBuffers(1, &(_indexBufferObject[slot]));
        }
        glGenBuffers(1, &(_indexBufferObject[slot]));
        _indexBufferSize[slot] = bufSize;

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBufferObject[slot]);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, bufSize, buf, GL_DYNAMIC_DRAW);
    }
    else
    {
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBufferObject[slot]);
        glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, bufSize, buf);
    }
}