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

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• Hash : eccd7ece
  Author :
  Date : 2017-09-14T15:46:22
  

  Use a heap for the released handle list.
  
  This will prioritize re-allocating smaller handles. It should not
  affect performance in most cases, but will prefer allocating
  handles that are in the "fast" portion of the resource map.
  
  BUG=angleproject:1458
  
  Change-Id: Ib2853be936f09fc1e6b5bfb870c360ce8424ab5f
  Reviewed-on: https://chromium-review.googlesource.com/665993
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/HandleAllocator.h

• //
  // 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.h: Defines the gl::HandleAllocator class, which is used to
  // allocate GL handles.
  
  #ifndef LIBANGLE_HANDLEALLOCATOR_H_
  #define LIBANGLE_HANDLEALLOCATOR_H_
  
  #include "common/angleutils.h"
  
  #include "angle_gl.h"
  
  namespace gl
  {
  
  class HandleAllocator final : angle::NonCopyable
  {
    public:
      // Maximum handle = MAX_UINT-1
      HandleAllocator();
      // Specify maximum handle value. Used for testing.
      HandleAllocator(GLuint maximumHandleValue);
  
      ~HandleAllocator();
  
      void setBaseHandle(GLuint value);
  
      GLuint allocate();
      void release(GLuint handle);
      void reserve(GLuint handle);
      void reset();
  
    private:
      GLuint mBaseValue;
      GLuint mNextValue;
      typedef std::vector<GLuint> HandleList;
      HandleList mFreeValues;
  
      // Represents an inclusive range [begin, end]
      struct HandleRange
      {
          HandleRange(GLuint beginIn, GLuint endIn) : begin(beginIn), end(endIn) {}
  
          GLuint begin;
          GLuint end;
      };
  
      struct HandleRangeComparator;
  
      // The freelist consists of never-allocated handles, stored
      // as ranges, and handles that were previously allocated and
      // released, stored in a heap.
      std::vector<HandleRange> mUnallocatedList;
      std::vector<GLuint> mReleasedList;
  };
  
  }  // namespace gl
  
  #endif   // LIBANGLE_HANDLEALLOCATOR_H_
  

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