kc3-lang/angle/src/libANGLE/HandleAllocator.cpp

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• Author : Geoff Lang
  Date : 2014-11-19 14:20:15
  Hash : 2b5420c0
  Message : Merge libGLESv2 and libEGL classes into libANGLE. BUG=angle:733 Change-Id: Ic491c971411fe82c56cd97c5c8325ac14ec218df Reviewed-on: https://chromium-review.googlesource.com/230830 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libANGLE/HandleAllocator.cpp

• //
  // Copyright (c) 2002-2011 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.
  //
  
  // HandleAllocator.cpp: Implements the gl::HandleAllocator class, which is used
  // to allocate GL handles.
  
  #include "libANGLE/HandleAllocator.h"
  
  #include "common/debug.h"
  
  namespace gl
  {
  
  HandleAllocator::HandleAllocator() : mBaseValue(1), mNextValue(1)
  {
  }
  
  HandleAllocator::~HandleAllocator()
  {
  }
  
  void HandleAllocator::setBaseHandle(GLuint value)
  {
      ASSERT(mBaseValue == mNextValue);
      mBaseValue = value;
      mNextValue = value;
  }
  
  GLuint HandleAllocator::allocate()
  {
      if (mFreeValues.size())
      {
          GLuint handle = mFreeValues.back();
          mFreeValues.pop_back();
          return handle;
      }
      return mNextValue++;
  }
  
  void HandleAllocator::release(GLuint handle)
  {
      if (handle == mNextValue - 1)
      {
          // Don't drop below base value
          if(mNextValue > mBaseValue)
          {
              mNextValue--;
          }
      }
      else
      {
          // Only free handles that we own - don't drop below the base value
          if (handle >= mBaseValue)
          {
              mFreeValues.push_back(handle);
          }
      }
  }
  
  }