[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/windowed_app_context_win.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2021 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. *
  ******************************************************************************
  */
@@ -15,11 +15,42 @@
 #include "xenia/base/platform_win.h"
 #include "xenia/ui/windowed_app_context.h"
 
+// For per-monitor DPI awareness v1.
+#include <ShellScalingApi.h>
+
 namespace xe {
 namespace ui {
 
 class Win32WindowedAppContext final : public WindowedAppContext {
  public:
+  // clang-format off
+  struct PerMonitorDpiV1Api {
+    HRESULT (STDAPICALLTYPE* get_dpi_for_monitor)(
+        HMONITOR hmonitor, MONITOR_DPI_TYPE dpi_type, UINT* dpi_x, UINT* dpi_y);
+  };
+  struct PerMonitorDpiV2Api {
+    // Important note: Even though per-monitor DPI awareness version 2
+    // inherently has automatic non-client area DPI scaling, PMv2 was added in
+    // Windows 10 1703. However, these functions were added earlier, in 1607.
+    // While we haven't tested the actual behavior on 1607 and this is just a
+    // guess, still, before using AdjustWindowRectExForDpi for the window DPI,
+    // make sure that EnableNonClientDpiScaling is called for the window in its
+    // WM_NCCREATE handler to enable automatic non-client DPI scaling on PMv1 on
+    // 1607, so AdjustWindowRectExForDpi (which doesn't have a window argument
+    // so it can't know whether automatic scaling is enabled for it) will likely
+    // return values that reflect the actual size of the non-client area of the
+    // window (otherwise, for instance, "un-adjusting" the actual window
+    // rectangle using AdjustWindowRectExForDpi may result in a negative client
+    // area size if the DPI passed to it is larger than the DPI actually used
+    // for the non-client area).
+    BOOL (WINAPI* adjust_window_rect_ex_for_dpi)(
+        LPRECT rect, DWORD style, BOOL menu, DWORD ex_style, UINT dpi);
+    BOOL (WINAPI* enable_non_client_dpi_scaling)(HWND hwnd);
+    UINT (WINAPI* get_dpi_for_system)();
+    UINT (WINAPI* get_dpi_for_window)(HWND hwnd);
+  };
+  // clang-format on
+
   // Must call Initialize and check its result after creating to be able to
   // perform pending function calls.
   explicit Win32WindowedAppContext(HINSTANCE hinstance, int show_cmd)
@@ -37,6 +68,23 @@ class Win32WindowedAppContext final : public WindowedAppContext {
 
   int RunMainMessageLoop();
 
+  // Per-monitor DPI awareness version 2 is expected to be enabled via the
+  // manifest, as that's the recommended way, which also doesn't require calling
+  // SetProcessDpiAwareness before doing anything that may depend on DPI
+  // awareness (so it's safe to use any Windows APIs before what would be
+  // supposed to initialize it).
+  // Windows 8.1 per-monitor DPI awareness version 1.
+  const PerMonitorDpiV1Api* per_monitor_dpi_v1_api() const {
+    return per_monitor_dpi_v1_api_available_ ? &per_monitor_dpi_v1_api_
+                                             : nullptr;
+  }
+  // Windows 10 1607 per-monitor DPI awareness API, also heavily used for
+  // per-monitor DPI awareness version 2 functionality added in Windows 10 1703.
+  const PerMonitorDpiV2Api* per_monitor_dpi_v2_api() const {
+    return per_monitor_dpi_v2_api_available_ ? &per_monitor_dpi_v2_api_
+                                             : nullptr;
+  }
+
  private:
   enum : UINT {
     kPendingFunctionsWindowClassMessageExecute = WM_USER,
@@ -47,9 +95,15 @@ class Win32WindowedAppContext final : public WindowedAppContext {
 
   HINSTANCE hinstance_;
   int show_cmd_;
-  HWND pending_functions_hwnd_ = nullptr;
+
+  HMODULE shcore_module_ = nullptr;
+  PerMonitorDpiV1Api per_monitor_dpi_v1_api_ = {};
+  PerMonitorDpiV2Api per_monitor_dpi_v2_api_ = {};
+  bool per_monitor_dpi_v1_api_available_ = false;
+  bool per_monitor_dpi_v2_api_available_ = false;
 
   static bool pending_functions_window_class_registered_;
+  HWND pending_functions_hwnd_ = nullptr;
 };
 
 }  // namespace ui