allocator_mtl.h

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// Copyright 2013 The Flutter 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 FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_
 
#include <Metal/Metal.h>
#include <atomic>
 
#include "impeller/base/thread.h"
#include "impeller/core/allocator.h"
 
namespace impeller {
 
class DebugAllocatorStats {
 public:
  DebugAllocatorStats() {}
 
  ~DebugAllocatorStats() {}
 
  /// Increment the tracked allocation size in bytes.
  void Increment(size_t size);
 
  /// Decrement the tracked allocation size in bytes.
  void Decrement(size_t size);
 
  /// Get the current tracked allocation size.
  Bytes GetAllocationSize();
 
 private:
  std::atomic<size_t> size_ = 0;
};
 
ISize DeviceMaxTextureSizeSupported(id<MTLDevice> device);
 
class AllocatorMTL final : public Allocator {
 public:
  AllocatorMTL();
 
  // |Allocator|
  ~AllocatorMTL() override;
 
  // |Allocator|
  Bytes DebugGetHeapUsage() const override;
 
  // visible for testing.
  void DebugSetSupportsUMA(bool value);
 
  AllocatorMTL(id<MTLDevice> device, std::string label);
 
 private:
  friend class ContextMTL;
 
  id<MTLDevice> device_;
  std::string allocator_label_;
  bool supports_memoryless_targets_ = false;
  bool supports_uma_ = false;
  bool is_valid_ = false;
 
#ifdef IMPELLER_DEBUG
  std::shared_ptr<DebugAllocatorStats> debug_allocater_ =
      std::make_shared<DebugAllocatorStats>();
#endif  // IMPELLER_DEBUG
 
  ISize max_texture_supported_;
 
  // |Allocator|
  bool IsValid() const;
 
  // |Allocator|
  std::shared_ptr<DeviceBuffer> OnCreateBuffer(
      const DeviceBufferDescriptor& desc) override;
 
  // |Allocator|
  std::shared_ptr<Texture> OnCreateTexture(const TextureDescriptor& desc,
                                           bool threadsafe) override;
 
  // |Allocator|
  uint16_t MinimumBytesPerRow(PixelFormat format) const override;
 
  // |Allocator|
  ISize GetMaxTextureSizeSupported() const override;
 
  // |Allocator|
  void DebugTraceMemoryStatistics() const override;
 
  AllocatorMTL(const AllocatorMTL&) = delete;
 
  AllocatorMTL& operator=(const AllocatorMTL&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_ALLOCATOR_MTL_H_