| // |
| // Copyright (c) 2002-2012 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" |
| |
| namespace gl |
| { |
| |
| Buffer::Buffer(rx::Renderer *renderer, GLuint id) : RefCountObject(id) |
| { |
| mRenderer = renderer; |
| mContents = NULL; |
| mSize = 0; |
| mUsage = GL_DYNAMIC_DRAW; |
| |
| mStaticVertexBuffer = NULL; |
| mStaticIndexBuffer = NULL; |
| mUnmodifiedDataUse = 0; |
| } |
| |
| Buffer::~Buffer() |
| { |
| delete[] mContents; |
| delete mStaticVertexBuffer; |
| delete mStaticIndexBuffer; |
| } |
| |
| 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) |
| { |
| mStaticVertexBuffer = new rx::StaticVertexBufferInterface(mRenderer); |
| mStaticIndexBuffer = new rx::StaticIndexBufferInterface(mRenderer); |
| } |
| } |
| |
| void Buffer::bufferSubData(const void *data, GLsizeiptr size, GLintptr offset) |
| { |
| memcpy(mContents + offset, data, size); |
| |
| if ((mStaticVertexBuffer && mStaticVertexBuffer->getBufferSize() != 0) || (mStaticIndexBuffer && mStaticIndexBuffer->getBufferSize() != 0)) |
| { |
| invalidateStaticData(); |
| } |
| |
| mUnmodifiedDataUse = 0; |
| } |
| |
| rx::StaticVertexBufferInterface *Buffer::getStaticVertexBuffer() |
| { |
| return mStaticVertexBuffer; |
| } |
| |
| rx::StaticIndexBufferInterface *Buffer::getStaticIndexBuffer() |
| { |
| return mStaticIndexBuffer; |
| } |
| |
| void Buffer::invalidateStaticData() |
| { |
| delete mStaticVertexBuffer; |
| mStaticVertexBuffer = NULL; |
| |
| delete mStaticIndexBuffer; |
| mStaticIndexBuffer = NULL; |
| |
| mUnmodifiedDataUse = 0; |
| } |
| |
| // Creates static buffers if sufficient used data has been left unmodified |
| void Buffer::promoteStaticUsage(int dataSize) |
| { |
| if (!mStaticVertexBuffer && !mStaticIndexBuffer) |
| { |
| mUnmodifiedDataUse += dataSize; |
| |
| if (mUnmodifiedDataUse > 3 * mSize) |
| { |
| mStaticVertexBuffer = new rx::StaticVertexBufferInterface(mRenderer); |
| mStaticIndexBuffer = new rx::StaticIndexBufferInterface(mRenderer); |
| } |
| } |
| } |
| |
| } |