kc3-lang/angle/libGLESv2/Buffer.cpp

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• Author : daniel@transgaming.com
  Date : 2010-03-11 19:41:38
  Hash : 0f7aaf53
  Message : Add support for Vertex Buffer Data Translation TRAC #11024 Signed-off-by: Nicolas Capens Signed-off-by: Daniel Koch Author: Andrew Lewycky <andrew.lewycky@transgaming.com> git-svn-id: https://angleproject.googlecode.com/svn/trunk@15 736b8ea6-26fd-11df-bfd4-992fa37f6226

• 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 "Buffer.h"
  
  #include <cstdlib>
  #include <limits>
  #include <utility>
  
  #include "debug.h"
  #include "geometry/backend.h"
  
  namespace gl
  {
  
  Buffer::Buffer(BufferBackEnd *backEnd)
      : mBackEnd(backEnd), mIdentityTranslation(NULL)
  {
  }
  
  Buffer::~Buffer()
  {
      delete mIdentityTranslation;
  }
  
  GLenum Buffer::bufferData(const void* data, GLsizeiptr size, GLenum usage)
  {
      if (size < 0) return GL_INVALID_VALUE;
  
      const data_t* newdata = static_cast<const data_t*>(data);
  
      if (size != mContents.size())
      {
          // vector::resize only provides the basic exception guarantee, so use temporaries & swap to get the strong exception guarantee.
          // We don't want to risk having mContents and mIdentityTranslation that have different contents or even different sizes.
          std::vector<data_t> newContents(newdata, newdata + size);
  
          TranslatedVertexBuffer *newIdentityTranslation = mBackEnd->createVertexBuffer(size);
  
          // No exceptions allowed after this point.
  
          mContents.swap(newContents);
  
          delete mIdentityTranslation;
          mIdentityTranslation = newIdentityTranslation;
      }
      else
      {
          const data_t* newdata = static_cast<const data_t*>(data);
          mContents.assign(newdata, newdata + size);
      }
  
      return copyToIdentityBuffer(0, size);
  }
  
  GLenum Buffer::bufferSubData(const void* data, GLsizeiptr size, GLintptr offset)
  {
      if (size < 0 || offset < 0) return GL_INVALID_VALUE;
      if (std::numeric_limits<GLsizeiptr>::max() - offset < size) return GL_INVALID_VALUE;
      if (size + offset > static_cast<GLsizeiptr>(mContents.size())) return GL_INVALID_VALUE;
  
      const data_t *newdata = static_cast<const data_t*>(data);
      copy(newdata, newdata + size, mContents.begin() + offset);
  
      return copyToIdentityBuffer(offset, size);
  }
  
  GLenum Buffer::copyToIdentityBuffer(GLintptr offset, GLsizeiptr length)
  {
      ASSERT(offset >= 0 && length >= 0);
  
      // This is a stalling map. Not great for performance.
      data_t *p = static_cast<data_t*>(mIdentityTranslation->map());
  
      memcpy(p + offset, &mContents[0] + offset, length);
      mIdentityTranslation->unmap();
  
      return GL_NO_ERROR;
  }
  
  }