src/OpenGL ES 2.0/libGLESv2/Buffer.cpp

//
// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// Buffer.cpp: Implements the Buffer class, representing storage of vertex and/or
// index data. Implements GL buffer objects and related functionality.
// [OpenGL ES 2.0.24] section 2.9 page 21.

#include "Buffer.h"

#include "main.h"
#include "VertexDataManager.h"
#include "IndexDataManager.h"

namespace gl
{

Buffer::Buffer(GLuint id) : RefCountObject(id)
{
    mContents = 0;
    mSize = 0;
    mUsage = GL_DYNAMIC_DRAW;
}

Buffer::~Buffer()
{
    if(mContents)
	{
		mContents->destruct();
	}
}

void Buffer::bufferData(const void *data, GLsizeiptr size, GLenum usage)
{
    if(size == 0)
    {
		if(mContents)
		{
			mContents->destruct();
			mContents = 0;
		}
    }
    else if(size != mSize)
    {
        if(mContents)
		{
			mContents->destruct();
			mContents = 0;
		}

		mContents = new sw::Resource(size + 1024);

		if(mContents)
		{
			memset((void*)mContents->getBuffer(), 0, size);
		}
    }

    if(data != NULL && size > 0)
    {
		memcpy((void*)mContents->getBuffer(), data, size);
    }

    mSize = size;
    mUsage = usage;
}

void Buffer::bufferSubData(const void *data, GLsizeiptr size, GLintptr offset)
{
	if(mContents)
	{
		char *buffer = (char*)mContents->lock(sw::PUBLIC);
		memcpy(buffer + offset, data, size);
		mContents->unlock();
	}
}

sw::Resource *Buffer::getResource()
{
	return mContents;
}

}