[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/base/cvar.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2020 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. *
  ******************************************************************************
  */
@@ -86,6 +86,10 @@ class ConfigVar : public CommandVar<T>, virtual public IConfigVar {
   void LoadGameConfigValue(std::shared_ptr<cpptoml::base> result) override;
   void SetConfigValue(T val);
   void SetGameConfigValue(T val);
+  // Changes the actual value used to the one specified, and also makes it the
+  // one that will be stored when the global config is written next time. After
+  // overriding, however, the next game config loaded may still change it.
+  void OverrideConfigValue(T val);
 
  private:
   std::string category_;
@@ -260,6 +264,16 @@ void ConfigVar<T>::SetGameConfigValue(T val) {
   UpdateValue();
 }
 template <class T>
+void ConfigVar<T>::OverrideConfigValue(T val) {
+  config_value_ = std::make_unique<T>(val);
+  // The user explicitly changes the value at runtime and wants it to take
+  // effect immediately. Drop everything with a higher priority. The next game
+  // config load, however, may still change it.
+  game_config_value_.reset();
+  this->commandline_value_.reset();
+  UpdateValue();
+}
+template <class T>
 void ConfigVar<T>::ResetConfigValueToDefault() {
   SetConfigValue(this->default_value_);
 }
@@ -373,6 +387,28 @@ ICommandVar* define_cmdvar(const char* name, T* default_value,
   extern type name;              \
   }
 
+#define ACCESS_CVar(name) (*cv::cv_##name)
+
+// dynamic_cast is needed because of virtual inheritance.
+#define OVERRIDE_CVar(name, type, value)                   \
+  dynamic_cast<cvar::ConfigVar<type>*>(&ACCESS_CVar(name)) \
+      ->OverrideConfigValue(value);
+
+#define OVERRIDE_bool(name, value) OVERRIDE_CVar(name, bool, value)
+
+#define OVERRIDE_int32(name, value) OVERRIDE_CVar(name, int32_t, value)
+
+#define OVERRIDE_uint32(name, value) OVERRIDE_CVar(name, uint32_t, value)
+
+#define OVERRIDE_uint64(name, value) OVERRIDE_CVar(name, uint64_t, value)
+
+#define OVERRIDE_double(name, value) OVERRIDE_CVar(name, double, value)
+
+#define OVERRIDE_string(name, value) OVERRIDE_CVar(name, std::string, value)
+
+#define OVERRIDE_path(name, value) \
+  OVERRIDE_CVar(name, std::filesystem::path, value)
+
 // Interface for changing the default value of a variable with auto-upgrading of
 // users' configs (to distinguish between a leftover old default and an explicit
 // override), without having to rename the variable.