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

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• Author : Jamie Madill
  Date : 2017-06-28 14:53:52
  Hash : 3244736a
  Message : Use MemoryProgramCache. Add the member functions for saving and loading from the binary cache, and hook them into the Program class. Requires that the Renderer supports the program binary extension. BUG=angleproject:1897 Change-Id: I2dc8d21b02da705ded58c5cd1943562c9c97c49b Reviewed-on: https://chromium-review.googlesource.com/522874 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• src/common/MemoryBuffer.cpp

• //
  // 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.
  //
  
  #include "common/MemoryBuffer.h"
  
  #include <algorithm>
  #include <cstdlib>
  
  #include "common/debug.h"
  
  namespace angle
  {
  
  // MemoryBuffer implementation.
  MemoryBuffer::MemoryBuffer() : mSize(0), mData(nullptr)
  {
  }
  
  MemoryBuffer::~MemoryBuffer()
  {
      free(mData);
      mData = nullptr;
  }
  
  bool MemoryBuffer::resize(size_t size)
  {
      if (size == 0)
      {
          free(mData);
          mData = nullptr;
          mSize = 0;
          return true;
      }
  
      if (size == mSize)
      {
          return true;
      }
  
      // Only reallocate if the size has changed.
      uint8_t *newMemory = reinterpret_cast<uint8_t *>(malloc(sizeof(uint8_t) * size));
      if (newMemory == nullptr)
      {
          return false;
      }
  
      if (mData)
      {
          // Copy the intersection of the old data and the new data
          std::copy(mData, mData + std::min(mSize, size), newMemory);
          free(mData);
      }
  
      mData = newMemory;
      mSize = size;
  
      return true;
  }
  
  size_t MemoryBuffer::size() const
  {
      return mSize;
  }
  
  const uint8_t *MemoryBuffer::data() const
  {
      return mData;
  }
  
  uint8_t *MemoryBuffer::data()
  {
      ASSERT(mData);
      return mData;
  }
  
  void MemoryBuffer::fill(uint8_t datum)
  {
      if (!empty())
      {
          std::fill(mData, mData + mSize, datum);
      }
  }
  
  MemoryBuffer::MemoryBuffer(MemoryBuffer &&other) : MemoryBuffer()
  {
      *this = std::move(other);
  }
  
  MemoryBuffer &MemoryBuffer::operator=(MemoryBuffer &&other)
  {
      std::swap(mSize, other.mSize);
      std::swap(mData, other.mData);
      return *this;
  }
  
  // ScratchBuffer implementation.
  
  ScratchBuffer::ScratchBuffer(uint32_t lifetime) : mLifetime(lifetime), mResetCounter(lifetime)
  {
  }
  
  ScratchBuffer::~ScratchBuffer()
  {
  }
  
  bool ScratchBuffer::get(size_t requestedSize, MemoryBuffer **memoryBufferOut)
  {
      if (mScratchMemory.size() == requestedSize)
      {
          mResetCounter    = mLifetime;
          *memoryBufferOut = &mScratchMemory;
          return true;
      }
  
      if (mScratchMemory.size() > requestedSize)
      {
          tick();
      }
  
      if (mResetCounter == 0 || mScratchMemory.size() < requestedSize)
      {
          mScratchMemory.resize(0);
          if (!mScratchMemory.resize(requestedSize))
          {
              return false;
          }
          mResetCounter = mLifetime;
      }
  
      ASSERT(mScratchMemory.size() >= requestedSize);
  
      *memoryBufferOut = &mScratchMemory;
      return true;
  }
  
  void ScratchBuffer::tick()
  {
      if (mResetCounter > 0)
      {
          --mResetCounter;
      }
  }
  
  void ScratchBuffer::clear()
  {
      mResetCounter = mLifetime;
      mScratchMemory.resize(0);
  }
  
  }  // namespace angle