SDL: Fixup touchscreen code

CMakeLists.txt

@@ -502,7 +502,7 @@ if(NOT BUILD_HYDRA_CORE AND NOT BUILD_LIBRETRO_CORE)
         )
     else()
         set(FRONTEND_SOURCE_FILES src/panda_sdl/main.cpp src/panda_sdl/frontend_sdl.cpp src/panda_sdl/mappings.cpp)
-        set(FRONTEND_HEADER_FILES "")
+        set(FRONTEND_HEADER_FILES "include/panda_sdl/frontend_sdl.hpp")
     endif()
 
     target_link_libraries(Alber PRIVATE AlberCore)

include/panda_sdl/frontend_sdl.hpp

@@ -23,6 +23,8 @@ class FrontendSDL {
 	SDL_GameController* gameController = nullptr;
 	InputMappings keyboardMappings;
 
+	u32 windowWidth = 400;
+	u32 windowHeight = 480;
 	int gameControllerID;
 	bool programRunning = true;
 	

src/panda_sdl/frontend_sdl.cpp

@@ -162,9 +162,9 @@ void FrontendSDL::run() {
 					if (emu.romType == ROMType::None) break;
 
 					if (event.button.button == SDL_BUTTON_LEFT) {
-						// Get current window dimensions
-						int windowWidth, windowHeight;
-						SDL_GetWindowSize(window, &windowWidth, &windowHeight);
+						if (windowWidth == 0 || windowHeight == 0) [[unlikely]] {
+							break;
+						}
 
 						// Go from window positions to [0, 400) for x and [0, 480) for y
 						const s32 x = (s32)std::round(event.button.x * 400.f / windowWidth);
@@ -298,9 +298,9 @@ void FrontendSDL::run() {
 				case SDL_WINDOWEVENT: {
 					auto type = event.window.event;
 					if (type == SDL_WINDOWEVENT_RESIZED) {
-						const u32 width = event.window.data1;
-						const u32 height = event.window.data2;
-						emu.setOutputSize(width, height);
+						windowWidth = event.window.data1;
+						windowHeight = event.window.data2;
+						emu.setOutputSize(windowWidth, windowHeight);
 					}
 				}
 			}