Initial commit - http://sourceforge.net/p/fceumm/code/160/

src/drivers/win/throttle.c

@@ -0,0 +1,84 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2002 Xodnizel
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+static uint64 tmethod, tfreq;
+static uint64 desiredfps;
+
+static void RefreshThrottleFPS(void) {
+	desiredfps = FCEUI_GetDesiredFPS() >> 8;
+}
+
+static uint64 GetCurTime(void) {
+	if (tmethod) {
+		uint64 tmp;
+
+		/* Practically, LARGE_INTEGER and uint64 differ only by signness and name. */
+		QueryPerformanceCounter((LARGE_INTEGER*)&tmp);
+
+		return(tmp);
+	} else
+		return((uint64)GetTickCount());
+}
+
+static void InitSpeedThrottle(void) {
+	tmethod = 0;
+	if (QueryPerformanceFrequency((LARGE_INTEGER*)&tfreq)) {
+		tmethod = 1;
+	} else
+		tfreq = 1000;
+	tfreq <<= 16;	/* Adjustment for fps returned from FCEUI_GetDesiredFPS(). */
+}
+
+
+static int SpeedThrottle(void) {
+	static uint64 ttime, ltime;
+
+ waiter:
+
+	ttime = GetCurTime();
+
+
+	if ((ttime - ltime) < (tfreq / desiredfps)) {
+		uint64 sleepy;
+		sleepy = (tfreq / desiredfps) - (ttime - ltime);
+		sleepy *= 1000;
+		sleepy /= tfreq >> 16;
+		Sleep(sleepy);
+		goto waiter;
+	}
+	if ((ttime - ltime) >= (tfreq * 4 / desiredfps))
+		ltime = ttime;
+	else {
+		ltime += tfreq / desiredfps;
+
+		if ((ttime - ltime) >= (tfreq / desiredfps))// Oops, we're behind!
+			return(1);
+	}
+	return(0);
+}
+
+// Quick code for internal FPS display.
+uint64 FCEUD_GetTime(void) {
+	return(GetCurTime());
+}
+uint64 FCEUD_GetTimeFreq(void) {
+	return(tfreq >> 16);
+}
+