kc3-lang/angle/src/libANGLE/renderer/metal/mtl_buffer_pool.mm

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• Hash : fe26bae4
  Author :
  Date : 2019-10-29T18:38:53
  

  Metal backend implementation pt 2
  
  This is without Metal specific shader translator implemented yet.
  
  Bug: angleproject:2634
  Change-Id: I95d589442251c9ba111bd05a2dc379a36739046c
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1855069
  Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/metal/mtl_buffer_pool.mm

• //
  // Copyright 2019 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.
  //
  // mtl_buffer_pool.mm:
  //    Implements the class methods for BufferPool.
  //
  
  #include "libANGLE/renderer/metal/mtl_buffer_pool.h"
  
  #include "libANGLE/renderer/metal/ContextMtl.h"
  
  namespace rx
  {
  
  namespace mtl
  {
  
  // BufferPool implementation.
  BufferPool::BufferPool(bool alwaysAllocNewBuffer)
      : mInitialSize(0),
        mBuffer(nullptr),
        mNextAllocationOffset(0),
        mSize(0),
        mAlignment(1),
        mBuffersAllocated(0),
        mMaxBuffers(0),
        mAlwaysAllocateNewBuffer(alwaysAllocNewBuffer)
  
  {}
  
  void BufferPool::initialize(ContextMtl *contextMtl,
                              size_t initialSize,
                              size_t alignment,
                              size_t maxBuffers)
  {
      destroy(contextMtl);
  
      mInitialSize = initialSize;
      mSize        = 0;
  
      mMaxBuffers = maxBuffers;
  
      updateAlignment(contextMtl, alignment);
  }
  
  BufferPool::~BufferPool() {}
  
  angle::Result BufferPool::allocateNewBuffer(ContextMtl *contextMtl)
  {
      if (mMaxBuffers > 0 && mBuffersAllocated >= mMaxBuffers)
      {
          // We reach the max number of buffers allowed.
          // Try to deallocate old and smaller size inflight buffers.
          releaseInFlightBuffers(contextMtl);
      }
  
      if (mMaxBuffers > 0 && mBuffersAllocated >= mMaxBuffers)
      {
          // If we reach this point, it means there was no buffer deallocated inside
          // releaseInFlightBuffers() thus, the number of buffers allocated still exceeds number
          // allowed.
          ASSERT(!mBufferFreeList.empty());
  
          // Reuse the buffer in free list:
          if (mBufferFreeList.front()->isBeingUsedByGPU(contextMtl))
          {
              contextMtl->flushCommandBufer();
              // Force the GPU to finish its rendering and make the old buffer available.
              contextMtl->cmdQueue().ensureResourceReadyForCPU(mBufferFreeList.front());
          }
  
          mBuffer = mBufferFreeList.front();
          mBufferFreeList.erase(mBufferFreeList.begin());
  
          return angle::Result::Continue;
      }
  
      ANGLE_TRY(Buffer::MakeBuffer(contextMtl, mSize, nullptr, &mBuffer));
  
      ASSERT(mBuffer);
  
      mBuffersAllocated++;
  
      return angle::Result::Continue;
  }
  
  angle::Result BufferPool::allocate(ContextMtl *contextMtl,
                                     size_t sizeInBytes,
                                     uint8_t **ptrOut,
                                     BufferRef *bufferOut,
                                     size_t *offsetOut,
                                     bool *newBufferAllocatedOut)
  {
      size_t sizeToAllocate = roundUp(sizeInBytes, mAlignment);
  
      angle::base::CheckedNumeric<size_t> checkedNextWriteOffset = mNextAllocationOffset;
      checkedNextWriteOffset += sizeToAllocate;
  
      if (!mBuffer || !checkedNextWriteOffset.IsValid() ||
          checkedNextWriteOffset.ValueOrDie() >= mSize || mAlwaysAllocateNewBuffer)
      {
          if (mBuffer)
          {
              ANGLE_TRY(commit(contextMtl));
          }
  
          if (sizeToAllocate > mSize)
          {
              mSize = std::max(mInitialSize, sizeToAllocate);
  
              // Clear the free list since the free buffers are now too small.
              destroyBufferList(contextMtl, &mBufferFreeList);
          }
  
          // The front of the free list should be the oldest. Thus if it is in use the rest of the
          // free list should be in use as well.
          if (mBufferFreeList.empty() || mBufferFreeList.front()->isBeingUsedByGPU(contextMtl))
          {
              ANGLE_TRY(allocateNewBuffer(contextMtl));
          }
          else
          {
              mBuffer = mBufferFreeList.front();
              mBufferFreeList.erase(mBufferFreeList.begin());
          }
  
          ASSERT(mBuffer->size() == mSize);
  
          mNextAllocationOffset = 0;
  
          if (newBufferAllocatedOut != nullptr)
          {
              *newBufferAllocatedOut = true;
          }
      }
      else if (newBufferAllocatedOut != nullptr)
      {
          *newBufferAllocatedOut = false;
      }
  
      ASSERT(mBuffer != nullptr);
  
      if (bufferOut != nullptr)
      {
          *bufferOut = mBuffer;
      }
  
      // Optionally map() the buffer if possible
      if (ptrOut)
      {
          *ptrOut = mBuffer->map(contextMtl) + mNextAllocationOffset;
      }
  
      if (offsetOut)
      {
          *offsetOut = static_cast<size_t>(mNextAllocationOffset);
      }
      mNextAllocationOffset += static_cast<uint32_t>(sizeToAllocate);
      return angle::Result::Continue;
  }
  
  angle::Result BufferPool::commit(ContextMtl *contextMtl)
  {
      if (mBuffer)
      {
          mBuffer->unmap(contextMtl);
  
          mInFlightBuffers.push_back(mBuffer);
          mBuffer = nullptr;
      }
  
      mNextAllocationOffset = 0;
  
      return angle::Result::Continue;
  }
  
  void BufferPool::releaseInFlightBuffers(ContextMtl *contextMtl)
  {
      for (auto &toRelease : mInFlightBuffers)
      {
          // If the dynamic buffer was resized we cannot reuse the retained buffer.
          if (toRelease->size() < mSize)
          {
              toRelease = nullptr;
              mBuffersAllocated--;
          }
          else
          {
              mBufferFreeList.push_back(toRelease);
          }
      }
  
      mInFlightBuffers.clear();
  }
  
  void BufferPool::destroyBufferList(ContextMtl *contextMtl, std::vector<BufferRef> *buffers)
  {
      ASSERT(mBuffersAllocated >= buffers->size());
      mBuffersAllocated -= buffers->size();
      buffers->clear();
  }
  
  void BufferPool::destroy(ContextMtl *contextMtl)
  {
      destroyBufferList(contextMtl, &mInFlightBuffers);
      destroyBufferList(contextMtl, &mBufferFreeList);
  
      reset();
  
      if (mBuffer)
      {
          mBuffer->unmap(contextMtl);
  
          mBuffer = nullptr;
      }
  }
  
  void BufferPool::updateAlignment(ContextMtl *contextMtl, size_t alignment)
  {
      ASSERT(alignment > 0);
  
      // NOTE(hqle): May check additional platform limits.
  
      mAlignment = alignment;
  }
  
  void BufferPool::reset()
  {
      mSize                    = 0;
      mNextAllocationOffset    = 0;
      mMaxBuffers              = 0;
      mAlwaysAllocateNewBuffer = false;
      mBuffersAllocated        = 0;
  }
  }
  }
  

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