kc3-lang/angle/src/libANGLE/renderer/vulkan/StreamingBuffer.h

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• Hash : e3dc5dd0
  Author :
  Date : 2018-03-16T07:37:21
  

  Vulkan: Add 2 features to StreamingBuffer
  
  This is prerequisite work to dynamic uniform buffer updates.
  
  1- Alignment parameter to be able to allocate by chunks of this
  alignment.
  2- Out boolean to indicate if a new VkBuffer has been assigned
  on the allocate operation.
  
  Bug:angleproject:2392
  
  Change-Id: If346e13200455febbe78045e908ae89c9dc93cdb
  Reviewed-on: https://chromium-review.googlesource.com/965612
  Commit-Queue: Luc Ferron <lucferron@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/vulkan/StreamingBuffer.h

• //
  // Copyright 2018 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.
  //
  // StreamingBuffer:
  //    Create, map and flush buffers as needed to hold data, returning a handle and offset for each
  //    chunk.
  //
  
  #ifndef LIBANGLE_RENDERER_VULKAN_STREAMING_BUFFER_H_
  #define LIBANGLE_RENDERER_VULKAN_STREAMING_BUFFER_H_
  
  #include "libANGLE/renderer/vulkan/vk_utils.h"
  
  namespace rx
  {
  
  class StreamingBuffer : public ResourceVk
  {
    public:
      StreamingBuffer(VkBufferUsageFlags usage, size_t minSize, size_t minAlignment);
      ~StreamingBuffer();
      gl::Error allocate(ContextVk *context,
                         size_t sizeInBytes,
                         uint8_t **ptrOut,
                         VkBuffer *handleOut,
                         VkDeviceSize *offsetOut,
                         bool *outNewBufferAllocated);
      gl::Error flush(ContextVk *context);
      void destroy(VkDevice device);
  
    private:
      VkBufferUsageFlags mUsage;
      size_t mMinSize;
      vk::Buffer mBuffer;
      vk::DeviceMemory mMemory;
      size_t mNextWriteOffset;
      size_t mLastFlushOffset;
      size_t mSize;
      size_t mMinAlignment;
      uint8_t *mMappedMemory;
  };
  
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_VULKAN_STREAMING_BUFFER_H_
  

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