Implemented a simple timer

CMakeLists.txt

@@ -19,6 +19,7 @@ add_executable(breakhack
 	src/map
 	src/map_lua
 	src/camera
+	src/timer
 	)
 
 target_link_libraries(breakhack

src/main.c

@@ -10,6 +10,7 @@
 #include "camera.h"
 #include "map.h"
 #include "map_lua.h"
+#include "timer.h"
 
 #define SCREEN_WIDTH	1024
 #define SCREEN_HEIGHT	768
@@ -123,10 +124,11 @@ static
 void run()
 {
 	bool quit = false;
+	Timer* fpsTimer = timer_create();
 
 	while (!quit)
 	{
-		int ticks = SDL_GetTicks();
+		timer_start(fpsTimer);
 
 		quit = handle_events();
 
@@ -137,10 +139,13 @@ void run()
 
 		SDL_RenderPresent(gRenderer);
 
-		ticks = SDL_GetTicks() - ticks;
+		int ticks = timer_get_ticks(fpsTimer);
 		if (ticks < 1000/60)
 			SDL_Delay((1000/60) - ticks);
+		timer_stop(fpsTimer);
 	}
+
+	timer_destroy(fpsTimer);
 }
 
 static

src/timer.c

@@ -0,0 +1,33 @@
+#include <SDL2/SDL.h>
+#include "util.h"
+#include "timer.h"
+
+Timer* timer_create()
+{
+	Timer *t = ec_malloc(sizeof(Timer));
+	t->startTime = 0;
+	return t;
+}
+
+void timer_start(Timer *t)
+{
+	t->startTime = SDL_GetTicks();
+}
+
+void timer_stop(Timer *t)
+{
+	t->startTime = 0;
+}
+
+unsigned int timer_get_ticks(Timer *t)
+{
+	if (!t->startTime)
+		return 0;
+
+	return SDL_GetTicks() - t->startTime;
+}
+
+void timer_destroy(Timer *t)
+{
+	free(t);
+}

src/timer.h

@@ -0,0 +1,14 @@
+#ifndef TIMER_H_
+#define	TIMER_H_
+
+typedef struct {
+	unsigned int startTime;
+} Timer;
+
+Timer* timer_create();
+void timer_start(Timer*);
+void timer_stop(Timer*);
+unsigned int timer_get_ticks(Timer*);
+void timer_destroy(Timer*);
+
+#endif // TIMER_H_