flappychik

commit ce79c14674a867237d45c54431e05f3efb3acfda
parent f1b185e337cc83f0bdee4708a2a7f8066862f4cb
Author: bsandro <brian.drosan@gmail.com>
Date:   Mon, 14 Feb 2022 03:52:57 +0200

variable speed & framerate

Diffstat:
M
main.c
 | 
14
++++++++++----

1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/main.c b/main.c
@@ -11,6 +11,9 @@
 #define WINDOW_FLAGS SDL_WINDOW_OPENGL | SDL_WINDOW_ALLOW_HIGHDPI
 #endif
 
+#define FPS 60
+#define SPEED 240 // pixels per second
+
 int main(int argc, char *argv[]) {
 	(void)argc;
 	(void)argv;
@@ -55,16 +58,19 @@ int main(int argc, char *argv[]) {
 
 		uint64_t t1 = SDL_GetTicks64();
 
-		if (t1 - t >= 1000/60) {
+		if (t1 - t >= 1000/FPS) {
 			SDL_RenderClear(renderer);
+			uint64_t ftime = t1 - t;
+			int offset = round(ftime * SPEED / 1000.0f);
+			printf("offset: %d\n", offset);
 
-			knife_rect.x += 1;
-			knife_rect.y += 1;
+			knife_rect.x += offset;
+			knife_rect.y += offset;
 			SDL_RenderCopy(renderer, tex_bg, NULL, NULL);
 			SDL_RenderCopy(renderer, tex_knife, NULL, &knife_rect);
 			SDL_RenderPresent(renderer);
 
-			printf("frame time: %llu\n", t1 - t);
+			printf("frame time: %llu\n", ftime);
 			t = t1;
 		}
 	}