kc3-lang/angle/src/libGLESv2/Buffer.cpp

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• Author : jbauman@chromium.org
  Date : 2011-09-26 21:10:13
  Hash : aa9c5ca9
  Message : Reset mUnmodifiedDataUse after bufferSubData Without this, enough draws from a buffer modified only with bufferSubData will cause it to switch become static. BUG= TEST= Review URL: http://codereview.appspot.com/5123042 git-svn-id: https://angleproject.googlecode.com/svn/trunk@769 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/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 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/VertexDataManager.h"
  #include "libGLESv2/IndexDataManager.h"
  
  namespace gl
  {
  
  Buffer::Buffer(GLuint id) : RefCountObject(id)
  {
      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 StaticVertexBuffer(getDevice());
          mStaticIndexBuffer = new StaticIndexBuffer(getDevice());
      }
  }
  
  void Buffer::bufferSubData(const void *data, GLsizeiptr size, GLintptr offset)
  {
      memcpy(mContents + offset, data, size);
      
      if ((mStaticVertexBuffer && mStaticVertexBuffer->size() != 0) || (mStaticIndexBuffer && mStaticIndexBuffer->size() != 0))
      {
          invalidateStaticData();
      }
  
      mUnmodifiedDataUse = 0;
  }
  
  StaticVertexBuffer *Buffer::getStaticVertexBuffer()
  {
      return mStaticVertexBuffer;
  }
  
  StaticIndexBuffer *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 StaticVertexBuffer(getDevice());
              mStaticIndexBuffer = new StaticIndexBuffer(getDevice());
          }
      }
  }
  
  }