GPU: Add D3D12 renderer

src/common/d3d12/descriptor_heap_manager.h

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+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "../types.h"
+#include "../windows_headers.h"
+#include <bitset>
+#include <d3d12.h>
+#include <map>
+#include <vector>
+#include <wrl/client.h>
+
+namespace D3D12 {
+// This class provides an abstraction for D3D12 descriptor heaps.
+struct DescriptorHandle final
+{
+  enum : u32
+  {
+    INVALID_INDEX = 0xFFFFFFFF
+  };
+
+  D3D12_CPU_DESCRIPTOR_HANDLE cpu_handle{};
+  D3D12_GPU_DESCRIPTOR_HANDLE gpu_handle{};
+  u32 index = INVALID_INDEX;
+
+  ALWAYS_INLINE operator bool() const { return index != INVALID_INDEX; }
+
+  ALWAYS_INLINE operator D3D12_CPU_DESCRIPTOR_HANDLE() const { return cpu_handle; }
+  ALWAYS_INLINE operator D3D12_GPU_DESCRIPTOR_HANDLE() const { return gpu_handle; }
+
+  ALWAYS_INLINE void Clear()
+  {
+    cpu_handle = {};
+    gpu_handle = {};
+    index = INVALID_INDEX;
+  }
+};
+
+class DescriptorHeapManager final
+{
+public:
+  DescriptorHeapManager();
+  ~DescriptorHeapManager();
+
+  ID3D12DescriptorHeap* GetDescriptorHeap() const { return m_descriptor_heap.Get(); }
+  u32 GetDescriptorIncrementSize() const { return m_descriptor_increment_size; }
+
+  bool Create(ID3D12Device* device, D3D12_DESCRIPTOR_HEAP_TYPE type, u32 num_descriptors, bool shader_visible);
+  void Destroy();
+
+  bool Allocate(DescriptorHandle* handle);
+  void Free(DescriptorHandle* handle);
+  void Free(u32 index);
+
+private:
+  Microsoft::WRL::ComPtr<ID3D12DescriptorHeap> m_descriptor_heap;
+  u32 m_num_descriptors = 0;
+  u32 m_descriptor_increment_size = 0;
+
+  D3D12_CPU_DESCRIPTOR_HANDLE m_heap_base_cpu = {};
+  D3D12_GPU_DESCRIPTOR_HANDLE m_heap_base_gpu = {};
+
+  static constexpr u32 BITSET_SIZE = 1024;
+  using BitSetType = std::bitset<BITSET_SIZE>;
+  std::vector<BitSetType> m_free_slots = {};
+};
+
+} // namespace D3D12