flappychik

commit b2c903946a4853d4f92408f0ad1695e085539559
parent 30132ce7542e0bf1cabc8d7ae925edd0c89d0d19
Author: bsandro <brian.drosan@gmail.com>
Date:   Wed, 16 Mar 2022 01:45:07 +0200

small cleanup (frame processing is a separate function now)

Diffstat:
M
main.c
 | 
53
+++++++++++++++++++++++++++++++++--------------------

1 file changed, 33 insertions(+), 20 deletions(-)
diff --git a/main.c b/main.c
@@ -11,8 +11,10 @@
 #define WINDOW_FLAGS SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI
 #endif
 
-#define FPS 60
-#define SPEED 80 // pixels per second
+#define GAME_WIN_WIDTH 640
+#define GAME_WIN_HEIGHT 480
+#define GAME_FPS 60
+#define GAME_SPEED 80 // pixels per second
 
 struct sprite_t {
 	SDL_Texture *texture;
@@ -29,6 +31,23 @@ struct game_t {
 	struct sprite_t ship;
 };
 
+void process_frame(uint64_t ts, uint64_t ftime, struct game_t *game) {
+	int offset = round(ftime * GAME_SPEED / 1000.0f);
+	//printf("offset: %d\n", offset);
+
+	game->ship.rect.x += offset;
+	game->ship.rect.y += offset;
+	game->ship.angle = ++game->ship.angle % 360;
+
+	SDL_RenderClear(game->renderer);
+	SDL_RenderCopy(game->renderer, game->bg.texture, NULL, NULL);
+	SDL_RenderCopyEx(game->renderer, game->ship.texture, NULL, &game->ship.rect, game->ship.angle, NULL, SDL_FLIP_NONE);
+	SDL_RenderPresent(game->renderer);
+
+	//printf("frame time: %llu\n", ftime);
+	game->last_frame = ts;
+}
+
 int main(int argc, char *argv[]) {
 	(void)argc;
 	(void)argv;
@@ -39,7 +58,7 @@ int main(int argc, char *argv[]) {
 
 	SDL_Init(SDL_INIT_VIDEO);
 
-	game.screen = SDL_CreateWindow("flappychik", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, WINDOW_FLAGS);
+	game.screen = SDL_CreateWindow("flappychik", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, GAME_WIN_WIDTH, GAME_WIN_HEIGHT, WINDOW_FLAGS);
 	assert(game.screen != NULL);
 	game.renderer = SDL_CreateRenderer(game.screen, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 	assert(game.renderer != NULL);
@@ -64,36 +83,30 @@ int main(int argc, char *argv[]) {
 	SDL_RenderPresent(game.renderer);
 
 	game.last_frame = SDL_GetTicks64();
+	// main game loop
 	while (!game.over) {
 		while (SDL_PollEvent(&event)) {
 			switch (event.type) {
 			case SDL_QUIT:
 				game.over = true;
 				break;
+			case SDL_KEYDOWN:
+				if (event.key.keysym.sym == SDLK_q) { // quit if "q" button is pressed
+					game.over = true;
+				}
+				break;
 			}
 		}
 
-		uint64_t t = SDL_GetTicks64();
-		uint64_t ftime = t - game.last_frame;
-
-		if (ftime >= 1000/FPS) {
-			int offset = round(ftime * SPEED / 1000.0f);
-			printf("offset: %d\n", offset);
-
-			game.ship.rect.x += offset;
-			game.ship.rect.y += offset;
-			game.ship.angle = ++game.ship.angle % 360;
-
-			SDL_RenderClear(game.renderer);
-			SDL_RenderCopy(game.renderer, game.bg.texture, NULL, NULL);
-			SDL_RenderCopyEx(game.renderer, game.ship.texture, NULL, &game.ship.rect, game.ship.angle, NULL, SDL_FLIP_NONE);
-			SDL_RenderPresent(game.renderer);
+		uint64_t ts = SDL_GetTicks64();
+		uint64_t ftime = ts - game.last_frame;
 
-			printf("frame time: %llu\n", ftime);
-			game.last_frame = t;
+		if (ftime >= 1000/GAME_FPS) {
+			process_frame(ts, ftime, &game);
 		}
 	}
 
+	// cleanup
 	SDL_DestroyTexture(game.bg.texture);
 	SDL_DestroyTexture(game.ship.texture);
 	SDL_DestroyRenderer(game.renderer);