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//
// 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 gl::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 "libGLESv2/Buffer.h"
#include "libGLESv2/main.h"
#include "libGLESv2/geometry/VertexDataManager.h"
#include "libGLESv2/geometry/IndexDataManager.h"
namespace gl
{
Buffer::Buffer(GLuint id) : RefCountObject(id)
{
mContents = NULL;
mSize = 0;
mUsage = GL_DYNAMIC_DRAW;
mVertexBuffer = NULL;
mIndexBuffer = NULL;
}
Buffer::~Buffer()
{
delete[] mContents;
delete mVertexBuffer;
delete mIndexBuffer;
}
void Buffer::bufferData(const void *data, GLsizeiptr size, GLenum usage)
{
if (size == 0)
{
delete[] mContents;
mContents = NULL;
}
else if (size != mSize)
{
delete[] mContents;
mContents = new GLubyte[size];
memset(mContents, 0, size);
}
if (data != NULL && size > 0)
{
memcpy(mContents, data, size);
}
mSize = size;
mUsage = usage;
invalidateStaticData();
if (usage == GL_STATIC_DRAW)
{
mVertexBuffer = new StaticVertexBuffer(getDevice());
mIndexBuffer = new StaticIndexBuffer(getDevice());
}
}
void Buffer::bufferSubData(const void *data, GLsizeiptr size, GLintptr offset)
{
memcpy(mContents + offset, data, size);
if ((mVertexBuffer && mVertexBuffer->size() != 0) || (mIndexBuffer && mIndexBuffer->size() != 0))
{
invalidateStaticData();
if (mUsage == GL_STATIC_DRAW)
{
// If applications update the buffer data after it has already been used in a draw call,
// it most likely isn't used as a static buffer so we should fall back to streaming usage
// for best performance. So ignore the usage hint and don't create new static buffers.
// mVertexBuffer = new StaticVertexBuffer(getDevice());
// mIndexBuffer = new StaticIndexBuffer(getDevice());
}
}
}
StaticVertexBuffer *Buffer::getVertexBuffer()
{
return mVertexBuffer;
}
StaticIndexBuffer *Buffer::getIndexBuffer()
{
return mIndexBuffer;
}
void Buffer::invalidateStaticData()
{
delete mVertexBuffer;
mVertexBuffer = NULL;
delete mIndexBuffer;
mIndexBuffer = NULL;
}
}
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