only render 1 sample per event loop

in_one_weekend/src/main.zig

@@ -128,9 +128,9 @@ pub fn main() anyerror!void {
             }
         }
 
+        if (k < samplesPerPixel) {
+
             // Render
-        {
-            while (k < samplesPerPixel) {
             _ = sdl.c.SDL_LockSurface(surface);
 
             var j: usize = 0;
@@ -160,11 +160,11 @@ pub fn main() anyerror!void {
             sdl.c.SDL_UnlockSurface(surface);
             _ = sdl.c.SDL_UpdateWindowSurface(window);
             k += 1;
-            }
-        }
 
-        if (k >= samplesPerPixel) {
+        } else {
+
             sdl.c.SDL_Delay(1000 / fps);
+
         }
     }
 }