dolphin/Source/Core/VideoBackends/D3D12/PerfQuery.h

// Copyright 2012 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <d3d12.h>

#include "VideoCommon/PerfQueryBase.h"

namespace DX12
{
class PerfQuery final : public PerfQueryBase
{
public:
  PerfQuery();
  ~PerfQuery();

  void EnableQuery(PerfQueryGroup type) override;
  void DisableQuery(PerfQueryGroup type) override;
  void ResetQuery() override;
  u32 GetQueryResult(PerfQueryType type) override;
  void FlushResults() override;
  bool IsFlushed() const override;

private:
  struct ActiveQuery
  {
    PerfQueryGroup query_type;
    UINT64 fence_value;
  };

  void WeakFlush();

  // Find the last fence value of all pending queries.
  UINT64 FindLastPendingFenceValue() const;

  // Only use when non-empty
  void FlushOne();

  static void QueueFenceCallback(void* owning_object, UINT64 fence_value);
  void QueueFence(UINT64 fence_value);

  // when testing in SMS: 64 was too small, 128 was ok
  static constexpr size_t PERF_QUERY_BUFFER_SIZE = 512;
  static constexpr size_t QUERY_READBACK_BUFFER_SIZE = PERF_QUERY_BUFFER_SIZE * sizeof(UINT64);

  std::array<ActiveQuery, PERF_QUERY_BUFFER_SIZE> m_query_buffer;
  int m_query_read_pos = 0;

  ID3D12QueryHeap* m_query_heap = nullptr;
  ID3D12Resource* m_query_readback_buffer = nullptr;

  ID3D12Fence* m_tracking_fence = nullptr;
  UINT64 m_next_fence_value = 0;
};

}  // namespace