window: auto-hide the cursor over the game window (#958)

* window: auto-hide the cursor over the game window

Hide the cursor when the game window is created and whenever the mouse
has been idle for two seconds; any mouse motion, button or wheel event
shows it again. Games that draw their own cursor (e.g. Blue Prince) no
longer show the host pointer on top of it.

Only real mouse input counts as activity: synthetic touch/pen mouse
events and zero-delta motion (sent by some platforms on focus or cursor
visibility changes) are ignored. The event loop only waits with a
timeout while the cursor is visible, so it still blocks indefinitely
once the cursor is hidden. The cursor is restored on shutdown.

Uses SDL_HideCursor/SDL_ShowCursor, which SDL implements for X11,
Wayland, Cocoa and Win32 and which only affect the cursor over the
emulator window.

Closes #282

* window: make cursor auto-hide optional in CLI and launcher

Co-authored-by: Anatolii Kucheruk <anatolii.kucheruk01@gmail.com>

---------

Co-authored-by: nmzik <Nmzik@mail.ru>
Co-authored-by: Anatolii Kucheruk <anatolii.kucheruk01@gmail.com>

src/common/emulatorConfig.cpp

@@ -72,6 +72,10 @@ bool FullscreenEnabled() {
 	return g_config->fullscreen_enabled;
 }
 
+bool HideCursorEnabled() {
+	return g_config->hide_cursor_enabled;
+}
+
 bool VrEnabled() {
 	return g_config->vr_enabled;
 }

src/common/emulatorConfig.h

@@ -53,6 +53,7 @@ struct ConfigOptions {
 	PresentMode            present_mode                = PresentMode::Mailbox;
 	int32_t                gpu_index                   = -1;
 	bool                   fullscreen_enabled          = false;
+	bool                   hide_cursor_enabled         = false;
 	bool                   vr_enabled                  = false;
 	bool                   amd_cpu_enabled             = false;
 	uint32_t               vblank_frequency            = 60;
@@ -93,6 +94,7 @@ uint32_t GetControllerVibrationIntensity();
 PresentMode GetPresentMode();
 int32_t GetGpuIndex();
 bool     FullscreenEnabled();
+bool     HideCursorEnabled();
 bool     VrEnabled();
 bool     AmdCpuEnabled();
 uint32_t GetVblankFrequency();