moonlight: fix touchscreen input on hosts without native touch

projects/ROCKNIX/packages/apps/moonlight/patches/moonlight-0001-fix-touchscreen-without-native-touch.patch

@@ -0,0 +1,58 @@
+From 2ea4ce664afefbcad1a767a1b21e6836fafc8368 Mon Sep 17 00:00:00 2001
+From: Edouard Durand <edouard.durand@gmail.com>
+Date: Sat, 1 Aug 2026 10:10:59 +0800
+Subject: [PATCH] sdl: fix touchscreen input on hosts without native touch
+ support
+
+---
+ src/input/sdl.c | 30 ++++++++++++++++++++++++++++--
+ 1 file changed, 28 insertions(+), 2 deletions(-)
+
+diff --git a/src/input/sdl.c b/src/input/sdl.c
+index 72a2a3e..9ef8b18 100644
+--- a/src/input/sdl.c
++++ b/src/input/sdl.c
+@@ -432,6 +432,12 @@ static void remove_gamepad(SDL_JoystickID sdl_id) {
+ void sdlinput_init(char* mappings) {
+   memset(gamepads, 0, sizeof(gamepads));
+
++  // Touch is handled above, either natively or by emulating the mouse there.
++  // Letting SDL also synthesise mouse events from touch moves its internal
++  // cursor, and the compositor then re-reports the real pointer once the touch
++  // ends, which arrives as a large spurious motion.
++  SDL_SetHint(SDL_HINT_TOUCH_MOUSE_EVENTS, "0");
++
+   SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER);
+ #if !SDL_VERSION_ATLEAST(2, 0, 9)
+   SDL_InitSubSystem(SDL_INIT_HAPTIC);
+@@ -542,8 +548,28 @@ int sdlinput_handle_event(SDL_Window* window, SDL_Event* event) {
+     event->tfinger.x = SDL_max(SDL_min(1.0f, event->tfinger.x), 0.0f);
+     event->tfinger.y = SDL_max(SDL_min(1.0f, event->tfinger.y), 0.0f);
+
+-    LiSendTouchEvent(touchEventType, event->tfinger.fingerId, event->tfinger.x, event->tfinger.y,
+-                     event->tfinger.pressure, 0.0f, 0.0f, LI_ROT_UNKNOWN);
++    if (LiSendTouchEvent(touchEventType, event->tfinger.fingerId, event->tfinger.x, event->tfinger.y,
++                         event->tfinger.pressure, 0.0f, 0.0f, LI_ROT_UNKNOWN) == LI_ERR_UNSUPPORTED) {
++      // The host has no native touch support, so drive the mouse instead.
++      int w, h;
++      SDL_GetWindowSize(window, &w, &h);
++
++      // A touchscreen is absolute, so position the pointer where the finger is
++      // rather than following the mouse capture mode.
++      switch (event->type) {
++      case SDL_FINGERDOWN:
++        LiSendMousePositionEvent(event->tfinger.x * w, event->tfinger.y * h, w, h);
++        LiSendMouseButtonEvent(BUTTON_ACTION_PRESS, BUTTON_LEFT);
++        break;
++      case SDL_FINGERMOTION:
++        LiSendMousePositionEvent(event->tfinger.x * w, event->tfinger.y * h, w, h);
++        break;
++      case SDL_FINGERUP:
++        // Deliberately no movement here: a release carries no new position.
++        LiSendMouseButtonEvent(BUTTON_ACTION_RELEASE, BUTTON_LEFT);
++        break;
++      }
++    }
+     break;
+   case SDL_CONTROLLERAXISMOTION:
+     gamepad = get_gamepad(event->caxis.which, false);