fps.c


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#include <time.h>

#include "SDL.h"
#include "SDL_opengl.h"

#include "fps.h"

static clock_t start;
static GLfloat fps;

void
GLPong_FPSInit(void) {
	start = SDL_GetTicks();
}

GLfloat
GLPong_FPSCount(void) {
	/* 10.0f is the number of frames we let draw before calculating FPS */
	fps = 10.0f / (SDL_GetTicks() - start) * 1000; /* 1 sec / 1 millisec == 1000 */
	start = SDL_GetTicks();
	return fps;
}