From f128345ee3b1d0480c7cf85d5299c396d64e4daa Mon Sep 17 00:00:00 2001
From: Victor Gamper <victor@wenzeslaus.de>
Date: Sat, 8 Feb 2020 12:51:24 +0100
Subject: replaced clock() with SDL_GetTicks()

---
 .gitignore |  1 +
 catch.c    | 35 +++++++++++++++--------------------
 catch.h    |  2 +-
 3 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/.gitignore b/.gitignore
index 324180f..7796cbb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /Windows
 /Windows32
 /Release
+/c-CATch
diff --git a/catch.c b/catch.c
index 9bdfee3..0ba86ac 100644
--- a/catch.c
+++ b/catch.c
@@ -68,7 +68,7 @@ int main(int argc, char* argv[]) {
 	while(run) {
 
 		// get the time
-		long deltaTime = clock();
+		long deltaTime = SDL_GetTicks();
 
 		// process all sdl events
 		SDL_Event event;
@@ -208,10 +208,10 @@ int main(int argc, char* argv[]) {
 			Font_DrawString(screen, SCREEN_WIDTH /2  - length * 4, 180, score_s);
 		}
 
-		// TODO draw the fps
+		// draw the fps
 		char fps_s[50]; // TODO this could create a buffer overflow
-		sprintf(fps_s, "FPS: %i", CLOCKS_PER_SEC / (clock() - last_fps_count_time));
-		last_fps_count_time = clock();
+		sprintf(fps_s, "FPS: %i", 1000 / (SDL_GetTicks() - last_fps_count_time));
+		last_fps_count_time = SDL_GetTicks();
 		int length = strlen(fps_s) + 1;
 		Font_DrawString(screen, SCREEN_WIDTH - length * 8, 24, fps_s);
 
@@ -222,28 +222,23 @@ int main(int argc, char* argv[]) {
 		SDL_Flip(screen);
 
 		// get the delta time
-		deltaTime = clock()-deltaTime;
+		deltaTime = SDL_GetTicks()-deltaTime;
 
-		// get the time in microseconds
-		if(deltaTime != 0) {
-			deltaTime /= (CLOCKS_PER_SEC / 1000);
+		// calculate the time until the next frame
+		deltaTime = TICK_SPEED - deltaTime;
 
-			// calculate the time until the next frame
-			deltaTime = TICK_SPEED - deltaTime;
+		// if it is higher than 0, sleep
+		if(deltaTime > 0) {
+				unsigned int time_from_sleep_return = SDL_GetTicks();
 
-			// if it is higher than 0, sleep
-			if(deltaTime > 0) {
-				unsigned int time_from_sleep_return = clock() / (CLOCKS_PER_SEC / 1000);
+				while(deltaTime + time_from_sleep_return > SDL_GetTicks()) {
 
-				while(deltaTime + time_from_sleep_return > (clock() / (CLOCKS_PER_SEC / 1000))) {
+					// try to sleep for the left time
+					unsigned int time = (deltaTime + time_from_sleep_return-SDL_GetTicks()) * 1000;
+					if(time > 0)
+						usleep(time);
 				}
-			}
 		}
-		//deltaTime = TICK_SPEED - deltaTime;
-		///printf("%d\n", deltaTime);
-		// wait 50 milliseconds
-
-
 	}
 
 	// dispose the surfaces
diff --git a/catch.h b/catch.h
index 73d9710..f8315f1 100644
--- a/catch.h
+++ b/catch.h
@@ -40,7 +40,7 @@
 #define STATE_GAME_OVER 3
 #define GAME_TIME 60
 
-#define TICK_SPEED 18
+#define TICK_SPEED 20
 #define TICKS_PER_SECOND 1000 / TICK_SPEED
 
 // cat and bird structures
-- 
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