[UI] Image post-processing and full presentation/window rework

[GPU] Add FXAA post-processing
[UI] Add FidelityFX FSR and CAS post-processing
[UI] Add blue noise dithering from 10bpc to 8bpc
[GPU] Apply the DC PWL gamma ramp closer to the spec, supporting fully white color
[UI] Allow the GPU CP thread to present on the host directly, bypassing the UI thread OS paint event
[UI] Allow variable refresh rate (or tearing)
[UI] Present the newest frame (restart) on DXGI
[UI] Replace GraphicsContext with a far more advanced Presenter with more coherent surface connection and UI overlay state management
[UI] Connect presentation to windows via the Surface class, not native window handles
[Vulkan] Switch to simpler Vulkan setup with no instance/device separation due to interdependencies and to pass fewer objects around
[Vulkan] Lower the minimum required Vulkan version to 1.0
[UI/GPU] Various cleanup, mainly ComPtr usage
[UI] Support per-monitor DPI awareness v2 on Windows
[UI] DPI-scale Dear ImGui
[UI] Replace the remaining non-detachable window delegates with unified window event and input listeners
[UI] Allow listeners to safely destroy or close the window, and to register/unregister listeners without use-after-free and the ABA problem
[UI] Explicit Z ordering of input listeners and UI overlays, top-down for input, bottom-up for drawing
[UI] Add explicit window lifecycle phases
[UI] Replace Window virtual functions with explicit desired state, its application, actual state, its feedback
[UI] GTK: Apply the initial size to the drawing area
[UI] Limit internal UI frame rate to that of the monitor
[UI] Hide the cursor using a timer instead of polling due to no repeated UI thread paints with GPU CP thread presentation, and only within the window

src/xenia/ui/imgui_drawer.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Copyright 2022 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
@@ -10,10 +10,14 @@
 #ifndef XENIA_UI_IMGUI_DRAWER_H_
 #define XENIA_UI_IMGUI_DRAWER_H_
 
+#include <cstddef>
+#include <cstdint>
 #include <memory>
 #include <vector>
 
 #include "xenia/ui/immediate_drawer.h"
+#include "xenia/ui/presenter.h"
+#include "xenia/ui/window.h"
 #include "xenia/ui/window_listener.h"
 
 struct ImDrawData;
@@ -23,43 +27,73 @@ struct ImGuiIO;
 namespace xe {
 namespace ui {
 
-class GraphicsContext;
+class ImGuiDialog;
 class Window;
 
-class ImGuiDrawer : public WindowListener {
+class ImGuiDrawer : public WindowInputListener, public UIDrawer {
  public:
-  ImGuiDrawer(Window* window);
+  ImGuiDrawer(Window* window, size_t z_order);
   ~ImGuiDrawer();
 
-  void SetupDefaultInput() {}
-
   ImGuiIO& GetIO();
-  void RenderDrawLists();
+
+  void AddDialog(ImGuiDialog* dialog);
+  void RemoveDialog(ImGuiDialog* dialog);
+
+  // SetPresenter may be called from the destructor.
+  void SetPresenter(Presenter* new_presenter);
+  void SetImmediateDrawer(ImmediateDrawer* new_immediate_drawer);
+  void SetPresenterAndImmediateDrawer(Presenter* new_presenter,
+                                      ImmediateDrawer* new_immediate_drawer) {
+    SetPresenter(new_presenter);
+    SetImmediateDrawer(new_immediate_drawer);
+  }
+
+  void Draw(UIDrawContext& ui_draw_context) override;
 
  protected:
-  void Initialize();
-  void SetupFont();
-
-  void RenderDrawLists(ImDrawData* data);
-
-  void OnKeyDown(KeyEvent* e) override;
-  void OnKeyUp(KeyEvent* e) override;
-  void OnKeyChar(KeyEvent* e) override;
-  void OnMouseDown(MouseEvent* e) override;
-  void OnMouseMove(MouseEvent* e) override;
-  void OnMouseUp(MouseEvent* e) override;
-  void OnMouseWheel(MouseEvent* e) override;
-
-  static ImGuiDrawer* current_drawer_;
-
-  Window* window_ = nullptr;
-  GraphicsContext* graphics_context_ = nullptr;
-
-  ImGuiContext* internal_state_ = nullptr;
-  std::unique_ptr<ImmediateTexture> font_texture_;
+  void OnKeyDown(KeyEvent& e) override;
+  void OnKeyUp(KeyEvent& e) override;
+  void OnKeyChar(KeyEvent& e) override;
+  void OnMouseDown(MouseEvent& e) override;
+  void OnMouseMove(MouseEvent& e) override;
+  void OnMouseUp(MouseEvent& e) override;
+  void OnMouseWheel(MouseEvent& e) override;
+  // For now, no need for OnDpiChanged because redrawing is done continuously.
 
  private:
-  void OnKey(KeyEvent* e, bool is_down);
+  void Initialize();
+
+  void SetupFontTexture();
+
+  void RenderDrawLists(ImDrawData* data, UIDrawContext& ui_draw_context);
+
+  void ClearInput();
+  void OnKey(KeyEvent& e, bool is_down);
+  void UpdateMousePosition(const MouseEvent& e);
+
+  Window* window_;
+  size_t z_order_;
+
+  ImGuiContext* internal_state_ = nullptr;
+
+  // All currently-attached dialogs that get drawn.
+  std::vector<ImGuiDialog*> dialogs_;
+  // Using an index, not an iterator, because after the erasure, the adjustment
+  // must be done for the vector element indices that would be in the iterator
+  // range that would be invalidated.
+  // SIZE_MAX if not currently in the dialog loop.
+  size_t dialog_loop_next_index_ = SIZE_MAX;
+
+  Presenter* presenter_ = nullptr;
+
+  ImmediateDrawer* immediate_drawer_ = nullptr;
+  // Resources specific to an immediate drawer - must be destroyed before
+  // detaching the presenter.
+  std::unique_ptr<ImmediateTexture> font_texture_;
+
+  double frame_time_tick_frequency_;
+  uint64_t last_frame_time_ticks_;
 };
 
 }  // namespace ui