Reorganize game loop

Honor the FPS cap with updating video. Now the update occurs after
processing all the input actions.

src/packages/game/IZ_app.c

@@ -9,5 +9,7 @@ int IZ_InitializeApp(IZ_App* app) {
 		app->actions[p] = 0;
 	}
 
+	app->video_update_at = 0u;
+
 	return 0;
 }

src/packages/game/IZ_app.h

@@ -12,6 +12,8 @@ typedef struct {
 	IZ_Action actions[PLAYERS];
 
 	SDL_Joystick* assigned_joysticks[PLAYERS];
+
+	uint64_t video_update_at;
 } IZ_App;
 
 int IZ_InitializeApp(IZ_App*);

src/packages/game/main.c

@@ -35,31 +35,18 @@ int main(int argc, char* args[]) {
 		return -2;
 	}
 
+	screen_surface = SDL_GetWindowSurface(window);
+
 	bool quit = false;
 	SDL_Event e;
-	screen_surface = SDL_GetWindowSurface(window);
 
-	while (!quit) {
-		SDL_FillRect(screen_surface, NULL, SDL_MapRGB(screen_surface->format, 0x00, 0x00, 0x00));
+	while (true) {
 		uint64_t ticks = SDL_GetTicks64();
-		for (uint8_t i = 0; i < 64; i += 1) {
-			const uint8_t column = (64 - i) % 32;
-			const uint8_t row = i / 32;
-			const uint64_t bitflag = (0x1lu << i);
-			const uint8_t size = 4;
-			if (ticks & bitflag) {
-				SDL_FillRect(screen_surface, &(SDL_Rect) {
-					column * size,
-					app.config.video.height - ((row + 1) * size),
-					size,
-					size
-					}, SDL_MapRGB(screen_surface->format, 0x00, 0xff, 0xff));
-			}
-		}
 
 		while (SDL_PollEvent(&e) != 0) {
 			if (e.type == SDL_QUIT) {
 				quit = true;
+				break;
 			}
 
 			// Handle joystick events
@@ -137,25 +124,49 @@ int main(int argc, char* args[]) {
 			}
 		}
 
-		// Update window
-		for (uint8_t current_player = 0; current_player < PLAYERS; current_player += 1) {
-			for (uint8_t i = 0; i < CONTROLS; i += 1) {
-				const uint8_t column = i % 4;
-				const uint8_t row = i / 4;
-				const IZ_Action bitflag = (0x1 << i);
+		if (quit) {
+			break;
+		}
+
+		if (ticks - app.video_update_at > 1000 / app.config.video.max_fps) {
+			// Update window
+			SDL_FillRect(screen_surface, NULL, SDL_MapRGB(screen_surface->format, 0x00, 0x00, 0x00));
+
+			for (uint8_t i = 0; i < 64; i += 1) {
+				const uint8_t column = (64 - i) % 32;
+				const uint8_t row = i / 32;
+				const uint64_t bitflag = (0x1lu << i);
 				const uint8_t size = 4;
-				if (app.actions[current_player] & bitflag) {
+				if (ticks & bitflag) {
 					SDL_FillRect(screen_surface, &(SDL_Rect) {
 						column * size,
-						row * size,
+						app.config.video.height - ((row + 1) * size),
 						size,
 						size
-					}, SDL_MapRGB(screen_surface->format, 0xff, 0xff, 0x00));
+					}, SDL_MapRGB(screen_surface->format, 0x00, 0xff, 0xff));
 				}
 			}
-		}
 
-		SDL_UpdateWindowSurface(window);
+			for (uint8_t current_player = 0; current_player < PLAYERS; current_player += 1) {
+				for (uint8_t i = 0; i < CONTROLS; i += 1) {
+					const uint8_t column = i % 4;
+					const uint8_t row = i / 4;
+					const IZ_Action bitflag = (0x1 << i);
+					const uint8_t size = 4;
+					if (app.actions[current_player] & bitflag) {
+						SDL_FillRect(screen_surface, &(SDL_Rect) {
+							column * size,
+							row * size,
+							size,
+							size
+						}, SDL_MapRGB(screen_surface->format, 0xff, 0xff, 0x00));
+					}
+				}
+			}
+			SDL_UpdateWindowSurface(window);
+
+			app.video_update_at = ticks;
+		}
 	}
 	SDL_DestroyWindow(window);
 	SDL_Quit();