kc3-lang/angle/src/libANGLE/renderer/d3d/d3d11/Buffer11.h

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• Hash : 0946393d
  Author :
  Date : 2018-04-04T05:26:59
  

  Move Buffer Subject/Observer to front end.
  
  This makes BufferImpl into an Observer Subject. It also refactors
  the Vertex Array updates for the D3D11 backend use more of a dirty
  bit coding style.
  
  This change makes it so Buffer contents changes trigger front-end
  dirty bits from the back-end, which may be undesirable.
  
  Bug: angleproject:2389
  Change-Id: Iac8ce1171284a86851c18cd1373ddf24fcefe40b
  Reviewed-on: https://chromium-review.googlesource.com/979812
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/d3d/d3d11/Buffer11.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.
  //
  
  // Buffer11.h: Defines the rx::Buffer11 class which implements rx::BufferImpl via rx::BufferD3D.
  
  #ifndef LIBANGLE_RENDERER_D3D_D3D11_BUFFER11_H_
  #define LIBANGLE_RENDERER_D3D_D3D11_BUFFER11_H_
  
  #include <array>
  #include <map>
  
  #include "libANGLE/angletypes.h"
  #include "libANGLE/renderer/d3d/BufferD3D.h"
  #include "libANGLE/renderer/d3d/d3d11/renderer11_utils.h"
  
  namespace gl
  {
  class FramebufferAttachment;
  }
  
  namespace rx
  {
  struct PackPixelsParams;
  class Renderer11;
  struct SourceIndexData;
  struct TranslatedAttribute;
  
  // The order of this enum governs priority of 'getLatestBufferStorage'.
  enum BufferUsage
  {
      BUFFER_USAGE_SYSTEM_MEMORY,
      BUFFER_USAGE_STAGING,
      BUFFER_USAGE_VERTEX_OR_TRANSFORM_FEEDBACK,
      BUFFER_USAGE_INDEX,
      // TODO: possibly share this buffer type with shader storage buffers.
      BUFFER_USAGE_INDIRECT,
      BUFFER_USAGE_PIXEL_UNPACK,
      BUFFER_USAGE_PIXEL_PACK,
      BUFFER_USAGE_UNIFORM,
      BUFFER_USAGE_EMULATED_INDEXED_VERTEX,
  
      BUFFER_USAGE_COUNT,
  };
  
  typedef size_t DataRevision;
  
  class Buffer11 : public BufferD3D
  {
    public:
      Buffer11(const gl::BufferState &state, Renderer11 *renderer);
      ~Buffer11() override;
  
      gl::ErrorOrResult<ID3D11Buffer *> getBuffer(const gl::Context *context, BufferUsage usage);
      gl::ErrorOrResult<ID3D11Buffer *> getEmulatedIndexedBuffer(const gl::Context *context,
                                                                 SourceIndexData *indexInfo,
                                                                 const TranslatedAttribute &attribute,
                                                                 GLint startVertex);
      gl::Error getConstantBufferRange(const gl::Context *context,
                                       GLintptr offset,
                                       GLsizeiptr size,
                                       const d3d11::Buffer **bufferOut,
                                       UINT *firstConstantOut,
                                       UINT *numConstantsOut);
      gl::ErrorOrResult<const d3d11::ShaderResourceView *> getSRV(const gl::Context *context,
                                                                  DXGI_FORMAT srvFormat);
      bool isMapped() const { return mMappedStorage != nullptr; }
      gl::Error packPixels(const gl::Context *context,
                           const gl::FramebufferAttachment &readAttachment,
                           const PackPixelsParams &params);
      size_t getTotalCPUBufferMemoryBytes() const;
  
      // BufferD3D implementation
      size_t getSize() const override;
      bool supportsDirectBinding() const override;
      gl::Error getData(const gl::Context *context, const uint8_t **outData) override;
      void initializeStaticData(const gl::Context *context) override;
      void invalidateStaticData(const gl::Context *context) override;
  
      // BufferImpl implementation
      gl::Error setData(const gl::Context *context,
                        gl::BufferBinding target,
                        const void *data,
                        size_t size,
                        gl::BufferUsage usage) override;
      gl::Error setSubData(const gl::Context *context,
                           gl::BufferBinding target,
                           const void *data,
                           size_t size,
                           size_t offset) override;
      gl::Error copySubData(const gl::Context *context,
                            BufferImpl *source,
                            GLintptr sourceOffset,
                            GLintptr destOffset,
                            GLsizeiptr size) override;
      gl::Error map(const gl::Context *context, GLenum access, void **mapPtr) override;
      gl::Error mapRange(const gl::Context *context,
                         size_t offset,
                         size_t length,
                         GLbitfield access,
                         void **mapPtr) override;
      gl::Error unmap(const gl::Context *context, GLboolean *result) override;
      gl::Error markTransformFeedbackUsage(const gl::Context *context) override;
  
    private:
      class BufferStorage;
      class EmulatedIndexedStorage;
      class NativeStorage;
      class PackStorage;
      class SystemMemoryStorage;
  
      struct ConstantBufferCacheEntry
      {
          ConstantBufferCacheEntry() : storage(nullptr), lruCount(0) {}
  
          BufferStorage *storage;
          unsigned int lruCount;
      };
  
      void markBufferUsage(BufferUsage usage);
      gl::Error garbageCollection(const gl::Context *context, BufferUsage currentUsage);
      gl::ErrorOrResult<NativeStorage *> getStagingStorage(const gl::Context *context);
      gl::ErrorOrResult<PackStorage *> getPackStorage(const gl::Context *context);
      gl::ErrorOrResult<SystemMemoryStorage *> getSystemMemoryStorage(const gl::Context *context);
  
      gl::Error updateBufferStorage(const gl::Context *context,
                                    BufferStorage *storage,
                                    size_t sourceOffset,
                                    size_t storageSize);
      gl::ErrorOrResult<BufferStorage *> getBufferStorage(const gl::Context *context,
                                                          BufferUsage usage);
      gl::ErrorOrResult<BufferStorage *> getLatestBufferStorage(const gl::Context *context) const;
  
      gl::ErrorOrResult<BufferStorage *> getConstantBufferRangeStorage(const gl::Context *context,
                                                                       GLintptr offset,
                                                                       GLsizeiptr size);
  
      BufferStorage *allocateStorage(BufferUsage usage);
      void updateDeallocThreshold(BufferUsage usage);
  
      // Free the storage if we decide it isn't being used very often.
      gl::Error checkForDeallocation(const gl::Context *context, BufferUsage usage);
  
      // For some cases of uniform buffer storage, we can't deallocate system memory storage.
      bool canDeallocateSystemMemory() const;
  
      // Updates data revisions and latest storage.
      void onCopyStorage(BufferStorage *dest, BufferStorage *source);
      void onStorageUpdate(BufferStorage *updatedStorage);
  
      Renderer11 *mRenderer;
      size_t mSize;
  
      BufferStorage *mMappedStorage;
  
      // Buffer storages are sorted by usage. It's important that the latest buffer storage picks
      // the lowest usage in the case where two storages are tied on data revision - this ensures
      // we never do anything dangerous like map a uniform buffer over a staging or system memory
      // copy.
      std::array<BufferStorage *, BUFFER_USAGE_COUNT> mBufferStorages;
      BufferStorage *mLatestBufferStorage;
  
      // These two arrays are used to track when to free unused storage.
      std::array<unsigned int, BUFFER_USAGE_COUNT> mDeallocThresholds;
      std::array<unsigned int, BUFFER_USAGE_COUNT> mIdleness;
  
      // Cache of D3D11 constant buffer for specific ranges of buffer data.
      // This is used to emulate UBO ranges on 11.0 devices.
      // Constant buffers are indexed by there start offset.
      typedef std::map<GLintptr /*offset*/, ConstantBufferCacheEntry> ConstantBufferCache;
      ConstantBufferCache mConstantBufferRangeStoragesCache;
      size_t mConstantBufferStorageAdditionalSize;
      unsigned int mMaxConstantBufferLruCount;
  };
  
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_D3D_D3D11_BUFFER11_H_
  

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