kc3-lang/angle/src/common/MemoryBuffer.h

• Show log

  Commit

• Hash : 996628a4
  Author :
  Date : 2018-09-24T16:39:26
  

  Vulkan: Add support for VkPipelineCache
  
  The cache is initialized from the application's blob cache and is
  occasionally written back to it for disk storage.
  
  Bug: angleproject:2516
  Change-Id: I4cba4b00a7b9641c2983ef07159bc62cd10a5519
  Reviewed-on: https://chromium-review.googlesource.com/1241373
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Yuly Novikov <ynovikov@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

Download

• src/common/MemoryBuffer.h

• //
  // Copyright (c) 2014 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.
  //
  
  #ifndef COMMON_MEMORYBUFFER_H_
  #define COMMON_MEMORYBUFFER_H_
  
  #include "common/Optional.h"
  #include "common/angleutils.h"
  #include "common/debug.h"
  
  #include <stdint.h>
  #include <cstddef>
  
  namespace angle
  {
  
  class MemoryBuffer final : NonCopyable
  {
    public:
      MemoryBuffer() = default;
      MemoryBuffer(size_t size) { resize(size); }
      ~MemoryBuffer();
  
      MemoryBuffer(MemoryBuffer &&other);
      MemoryBuffer &operator=(MemoryBuffer &&other);
  
      bool resize(size_t size);
      size_t size() const { return mSize; }
      bool empty() const { return mSize == 0; }
  
      const uint8_t *data() const { return mData; }
      uint8_t *data()
      {
          ASSERT(mData);
          return mData;
      }
  
      uint8_t &operator[](size_t pos)
      {
          ASSERT(pos < mSize);
          return mData[pos];
      }
      const uint8_t &operator[](size_t pos) const
      {
          ASSERT(pos < mSize);
          return mData[pos];
      }
  
      void fill(uint8_t datum);
  
    private:
      size_t mSize   = 0;
      uint8_t *mData = nullptr;
  };
  
  class ScratchBuffer final : NonCopyable
  {
    public:
      // If we request a scratch buffer requesting a smaller size this many times, release and
      // recreate the scratch buffer. This ensures we don't have a degenerate case where we are stuck
      // hogging memory.
      ScratchBuffer(uint32_t lifetime);
      ~ScratchBuffer();
  
      // Returns true with a memory buffer of the requested size, or false on failure.
      bool get(size_t requestedSize, MemoryBuffer **memoryBufferOut);
  
      // Same as get, but ensures new values are initialized to a fixed constant.
      bool getInitialized(size_t requestedSize, MemoryBuffer **memoryBufferOut, uint8_t initValue);
  
      // Ticks the release counter for the scratch buffer. Also done implicitly in get().
      void tick();
  
      void clear();
  
    private:
      bool getImpl(size_t requestedSize, MemoryBuffer **memoryBufferOut, Optional<uint8_t> initValue);
  
      const uint32_t mLifetime;
      uint32_t mResetCounter;
      MemoryBuffer mScratchMemory;
  };
  
  }  // namespace angle
  
  #endif  // COMMON_MEMORYBUFFER_H_
  

Download