Add D3DCommon (shared code between D3D11 and D3D12)

Source/Core/VideoBackends/D3DCommon/SwapChain.h

@@ -0,0 +1,74 @@
+// Copyright 2019 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <dxgi1_5.h>
+#include <wrl/client.h>
+
+#include "Common/CommonTypes.h"
+#include "Common/WindowSystemInfo.h"
+#include "VideoBackends/D3DCommon/Common.h"
+#include "VideoCommon/TextureConfig.h"
+
+namespace D3DCommon
+{
+class SwapChain
+{
+public:
+  SwapChain(const WindowSystemInfo& wsi, IDXGIFactory2* dxgi_factory, IUnknown* d3d_device);
+  virtual ~SwapChain();
+
+  // Sufficient buffers for triple buffering.
+  static const u32 SWAP_CHAIN_BUFFER_COUNT = 3;
+
+  // Returns true if the stereo mode is quad-buffering.
+  static bool WantsStereo();
+
+  IDXGISwapChain1* GetDXGISwapChain() const { return m_swap_chain.Get(); }
+  AbstractTextureFormat GetFormat() const { return m_texture_format; }
+  u32 GetWidth() const { return m_width; }
+  u32 GetHeight() const { return m_height; }
+  u32 GetLayers() const { return m_stereo ? 2u : 1u; }
+  bool IsStereoEnabled() const { return m_stereo; }
+  bool HasExclusiveFullscreen() const { return m_has_fullscreen; }
+
+  // Mode switches.
+  bool GetFullscreen() const;
+  void SetFullscreen(bool request);
+
+  // Checks for loss of exclusive fullscreen.
+  bool CheckForFullscreenChange();
+
+  // Presents the swap chain to the screen.
+  virtual bool Present();
+
+  bool ChangeSurface(void* native_handle);
+  bool ResizeSwapChain();
+  void SetStereo(bool stereo);
+
+protected:
+  u32 GetSwapChainFlags() const;
+  bool CreateSwapChain(bool stereo);
+  void DestroySwapChain();
+
+  virtual bool CreateSwapChainBuffers() = 0;
+  virtual void DestroySwapChainBuffers() = 0;
+
+  WindowSystemInfo m_wsi;
+  Microsoft::WRL::ComPtr<IDXGIFactory2> m_dxgi_factory;
+  Microsoft::WRL::ComPtr<IDXGISwapChain1> m_swap_chain;
+  Microsoft::WRL::ComPtr<IUnknown> m_d3d_device;
+  AbstractTextureFormat m_texture_format = AbstractTextureFormat::RGBA8;
+
+  u32 m_width = 1;
+  u32 m_height = 1;
+
+  bool m_stereo = false;
+  bool m_allow_tearing_supported = false;
+  bool m_has_fullscreen = false;
+  bool m_fullscreen_request = false;
+};
+
+}  // namespace D3DCommon