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

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• Hash : f4d3041a
  Author :
  Date : 2024-04-13T22:37:11
  

  Remove double-serialization for glGetProgramBinary
  
  The applications get the binary length first, and then get the binary
  itself.  Prior to this change, ANGLE was serializing the program binary
  twice.
  
  What's more, if the blob cache is enabled, ANGLE serialized the program
  binary yet another time for that.
  
  With this change, the program binary is serialized only once.  If the
  application queries the program binary, serialization is done the first
  time needed, is cached and then discarded as soon as the binary itself
  is returned.
  
  Bug: angleproject:7393
  Change-Id: If6e3011097ca4d4a1cdcd2dcc23496901196d999
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5448090
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/common/MemoryBuffer.h

• //
  // Copyright 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();
  
      MemoryBuffer(MemoryBuffer &&other);
      MemoryBuffer &operator=(MemoryBuffer &&other);
  
      [[nodiscard]] bool resize(size_t size);
      void clear() { (void)resize(0); }
      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:
      ScratchBuffer();
      // 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();
  
      ScratchBuffer(ScratchBuffer &&other);
      ScratchBuffer &operator=(ScratchBuffer &&other);
  
      // 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);
  
      uint32_t mLifetime;
      uint32_t mResetCounter;
      MemoryBuffer mScratchMemory;
  };
  
  }  // namespace angle
  
  #endif  // COMMON_MEMORYBUFFER_H_
  

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