Qt: Fix handling of display window size in hidpi

src/duckstation-qt/d3d11displaywindow.h

@@ -0,0 +1,95 @@
+#pragma once
+#include "YBaseLib/Windows/WindowsHeaders.h"
+#include "common/d3d11/stream_buffer.h"
+#include "common/d3d11/texture.h"
+#include "core/host_display.h"
+#include "qtdisplaywindow.h"
+#include <d3d11.h>
+#include <memory>
+#include <wrl/client.h>
+
+class D3D11DisplayWindow final : public QtDisplayWindow, private HostDisplay
+{
+  Q_OBJECT
+
+public:
+  template<typename T>
+  using ComPtr = Microsoft::WRL::ComPtr<T>;
+
+  D3D11DisplayWindow(QtHostInterface* host_interface, QWindow* parent);
+  ~D3D11DisplayWindow();
+
+  HostDisplay* getHostDisplayInterface() override;
+
+  bool createDeviceContext(QThread* worker_thread) override;
+  bool initializeDeviceContext() override;
+  void destroyDeviceContext() override;
+
+  RenderAPI GetRenderAPI() const override;
+  void* GetRenderDevice() const override;
+  void* GetRenderContext() const override;
+  void* GetRenderWindow() const override;
+
+  void ChangeRenderWindow(void* new_window) override;
+
+  std::unique_ptr<HostDisplayTexture> CreateTexture(u32 width, u32 height, const void* data, u32 data_stride,
+                                                    bool dynamic) override;
+  void UpdateTexture(HostDisplayTexture* texture, u32 x, u32 y, u32 width, u32 height, const void* data,
+                     u32 data_stride) override;
+
+  void SetDisplayTexture(void* texture, s32 offset_x, s32 offset_y, s32 width, s32 height, u32 texture_width,
+                         u32 texture_height, float aspect_ratio) override;
+  void SetDisplayLinearFiltering(bool enabled) override;
+  void SetDisplayTopMargin(int height) override;
+
+  void SetVSync(bool enabled) override;
+
+  std::tuple<u32, u32> GetWindowSize() const override;
+  void WindowResized() override;
+
+  void Render() override;
+
+  void onWindowResized(int width, int height) override;
+
+private:
+  static constexpr u32 DISPLAY_UNIFORM_BUFFER_SIZE = 16;
+
+  bool createImGuiContext() override;
+  void destroyImGuiContext() override;
+  bool createDeviceResources() override;
+  void destroyDeviceResources() override;
+
+  bool createSwapChainRTV();
+
+  void renderDisplay();
+
+  ComPtr<ID3D11Device> m_device;
+  ComPtr<ID3D11DeviceContext> m_context;
+  ComPtr<IDXGISwapChain> m_swap_chain;
+  ComPtr<ID3D11RenderTargetView> m_swap_chain_rtv;
+
+  ComPtr<ID3D11RasterizerState> m_display_rasterizer_state;
+  ComPtr<ID3D11DepthStencilState> m_display_depth_stencil_state;
+  ComPtr<ID3D11BlendState> m_display_blend_state;
+  ComPtr<ID3D11VertexShader> m_display_vertex_shader;
+  ComPtr<ID3D11PixelShader> m_display_pixel_shader;
+  ComPtr<ID3D11SamplerState> m_point_sampler;
+  ComPtr<ID3D11SamplerState> m_linear_sampler;
+
+  D3D11::Texture m_display_pixels_texture;
+  D3D11::StreamBuffer m_display_uniform_buffer;
+
+  ID3D11ShaderResourceView* m_display_srv = nullptr;
+  s32 m_display_offset_x = 0;
+  s32 m_display_offset_y = 0;
+  s32 m_display_width = 0;
+  s32 m_display_height = 0;
+  u32 m_display_texture_width = 0;
+  u32 m_display_texture_height = 0;
+  int m_display_top_margin = 0;
+  float m_display_aspect_ratio = 1.0f;
+
+  bool m_display_texture_changed = false;
+  bool m_display_linear_filtering = false;
+  bool m_vsync = false;
+};