1 files changed, 41 insertions, 0 deletions
diff --git a/plugins/dfOpenGL/fps.c b/plugins/dfOpenGL/fps.c
new file mode 100644
index 00000000..21f95c7f
--- /dev/null
+++ b/plugins/dfOpenGL/fps.c
@@ -0,0 +1,41 @@
+#include <sys/time.h>
+#include <unistd.h>
+#include "gpu_i.h"
+
+static const double NTSC = 100000000/5994;
+static const double PAL = 100000000/5000;
+
+static double lastvsync = 0;
+#define FRAMESAMPLES 10
+
+double GetTime()	//in microseconds
+{
+ struct timeval tv;
+ gettimeofday(&tv, 0);                                 // well, maybe there are better ways
+ return (double)tv.tv_sec * 1000000 + tv.tv_usec;      // to do that, but at least it works
+}
+
+void waitforrealtime()
+{
+	double currenttime,tickstogo;
+	double target;
+
+	currenttime = GetTime();
+
+	if (currenttime < lastvsync + 1000000)
+		target = lastvsync + (psxDisp.pal ? PAL : NTSC);
+	else
+		target = currenttime;
+
+	lastvsync = target;
+
+	while (currenttime < target)
+	{
+		tickstogo = target - currenttime;
+		if (tickstogo >= 500.0f)
+		{
+			usleep((useconds_t)tickstogo-200);	//usleep in microseconds
+		}
+		currenttime = GetTime();
+	}
+}