1 files changed, 27 insertions, 0 deletions
diff --git a/fps.c b/fps.c
new file mode 100644
index 0000000..4379e38
--- /dev/null
+++ b/fps.c
@@ -0,0 +1,27 @@
+#include <time.h>
+
+#include "SDL.h"
+#include "SDL_opengl.h"
+
+#include "text.h"
+#include "fps.h"
+
+static clock_t start;
+static GLfloat fps;
+
+void
+GLPong_FPSInit() {
+	start = SDL_GetTicks();
+}
+
+void
+GLPong_FPSCount() {
+	// 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();
+}
+
+void
+GLPong_FPSPrint() {
+	printf("%.2f frames per second\n", fps);
+}