SDL: Implement touchscreen support

minetest · Jan 13, 2024 · 7df45b4 · 7df45b4
1 parent a2b6244
commit 7df45b4
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Showing 2 changed files with 47 additions and 1 deletion.
diff --git a/source/Irrlicht/CIrrDeviceSDL.cpp b/source/Irrlicht/CIrrDeviceSDL.cpp
@@ -229,7 +229,7 @@ CIrrDeviceSDL::CIrrDeviceSDL(const SIrrlichtCreationParameters& param)
 	Window((SDL_Window*)param.WindowId), SDL_Flags(0),
 	MouseX(0), MouseY(0), MouseXRel(0), MouseYRel(0), MouseButtonStates(0),
 	Width(param.WindowSize.Width), Height(param.WindowSize.Height),
-	Resizable(param.WindowResizable == 1 ? true : false)
+	Resizable(param.WindowResizable == 1 ? true : false), CurrentTouchCount(0)
 {
 	#ifdef _DEBUG
 	setDebugName("CIrrDeviceSDL");
@@ -254,6 +254,11 @@ CIrrDeviceSDL::CIrrDeviceSDL(const SIrrlichtCreationParameters& param)
 		}
 	}
 
+	// Minetest has its own code to synthesize mouse events from touch events,
+	// so we prevent SDL from doing it.
+	SDL_SetHint(SDL_HINT_TOUCH_MOUSE_EVENTS, "0");
+	SDL_SetHint(SDL_HINT_MOUSE_TOUCH_EVENTS, "0");
+
 	// create keymap
 	createKeyMap();
 
@@ -745,6 +750,45 @@ bool CIrrDeviceSDL::run()
 			postEventFromUser(irrevent);
 			break;
 
+		case SDL_FINGERDOWN:
+			irrevent.EventType = EET_TOUCH_INPUT_EVENT;
+			irrevent.TouchInput.Event = ETIE_PRESSED_DOWN;
+			irrevent.TouchInput.ID = SDL_event.tfinger.fingerId;
+			irrevent.TouchInput.X = SDL_event.tfinger.x * Width;
+			irrevent.TouchInput.Y = SDL_event.tfinger.y * Height;
+			CurrentTouchCount++;
+			irrevent.TouchInput.touchedCount = CurrentTouchCount;
+
+			postEventFromUser(irrevent);
+			break;
+
+		case SDL_FINGERMOTION:
+			irrevent.EventType = EET_TOUCH_INPUT_EVENT;
+			irrevent.TouchInput.Event = ETIE_MOVED;
+			irrevent.TouchInput.ID = SDL_event.tfinger.fingerId;
+			irrevent.TouchInput.X = SDL_event.tfinger.x * Width;
+			irrevent.TouchInput.Y = SDL_event.tfinger.y * Height;
+			irrevent.TouchInput.touchedCount = CurrentTouchCount;
+
+			postEventFromUser(irrevent);
+			break;
+
+		case SDL_FINGERUP:
+			irrevent.EventType = EET_TOUCH_INPUT_EVENT;
+			irrevent.TouchInput.Event = ETIE_LEFT_UP;
+			irrevent.TouchInput.ID = SDL_event.tfinger.fingerId;
+			irrevent.TouchInput.X = SDL_event.tfinger.x * Width;
+			irrevent.TouchInput.Y = SDL_event.tfinger.y * Height;
+			// To match Android behavior, still count the pointer that was
+			// just released.
+			irrevent.TouchInput.touchedCount = CurrentTouchCount;
+			if (CurrentTouchCount > 0) {
+				CurrentTouchCount--;
+			}
+
+			postEventFromUser(irrevent);
+			break;
+
 		default:
 			break;
 		} // end switch

diff --git a/source/Irrlicht/CIrrDeviceSDL.h b/source/Irrlicht/CIrrDeviceSDL.h
@@ -318,6 +318,8 @@ namespace irr
 
 		core::array<SKeyMap> KeyMap;
 		SDL_SysWMinfo Info;
+
+		s32 CurrentTouchCount;
 	};
 
 } // end namespace irr