Fix UI freeze: clamp FPSLimit frame-limiter underflow in draw_screen() (#99)

szb78 · szb78 · web-flow · commit cc0d98734518 · 2026-07-07T13:57:06.000Z
Co-authored-by: szb78 &lt;bertalan.szuros@gmail.com&gt;
diff --git a/src/launcher.c b/src/launcher.c
@@ -812,9 +812,9 @@ static void draw_screen()
     // Output to screen
     SDL_RenderPresent(renderer);
     if (!config.vsync) {
-        Uint32 sleep_time = refresh_period - (SDL_GetTicks() - ticks.main);
-        if (sleep_time > 0)
-            SDL_Delay(sleep_time);
+        Uint32 elapsed = SDL_GetTicks() - ticks.main;
+        if (elapsed < refresh_period)
+            SDL_Delay(refresh_period - elapsed);
     }
 }
 

Original file line number	Diff line number	Diff line change
`@@ -812,9 +812,9 @@ static void draw_screen()`
`812`	`812`	`// Output to screen`
`813`	`813`	`SDL_RenderPresent(renderer);`
`814`	`814`	`if (!config.vsync) {`
`815`		`- Uint32 sleep_time = refresh_period - (SDL_GetTicks() - ticks.main);`
`816`		`- if (sleep_time > 0)`
`817`		`- SDL_Delay(sleep_time);`
	`815`	`+ Uint32 elapsed = SDL_GetTicks() - ticks.main;`
	`816`	`+ if (elapsed < refresh_period)`
	`817`	`+ SDL_Delay(refresh_period - elapsed);`
`818`	`818`	`}`
`819`	`819`	`}`
`820`	`820`