X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fpc%2Fthrottle.c;h=81cd916702cfaee58651f2c426b2b95bbca47b38;hb=15300263784975ac57355208762caa5ef7906624;hp=91879aecc0e1e7262ac5f605725150bc2bf8f3d8;hpb=4d2721282a59f1dcb66a91291a85b2604517371f;p=fceu.git

diff --git a/drivers/pc/throttle.c b/drivers/pc/throttle.c
index 91879ae..81cd916 100644
--- a/drivers/pc/throttle.c
+++ b/drivers/pc/throttle.c
@@ -2,6 +2,7 @@
 #include "main.h"
 #include "throttle.h"
 
+#if 0
 static uint64 tfreq;
 static uint64 desiredfps;
 
@@ -44,3 +45,66 @@ INLINE void SpeedThrottle(void)
   ltime+=tfreq/desiredfps;
 }
 
+#else
+
+extern uint8 PAL;
+extern int FSkip, FSkip_setting;
+static int usec_aim = 0, usec_done = 0;
+static int skip_count = 0;
+
+INLINE void SpeedThrottle(void)
+{
+	static struct timeval tv_prev;
+	struct timeval tv_now;
+	int delta_nom = PAL ? 19997 : 16639; // ~50.007, 19.997 ms/frame : ~60.1, 16.639 ms/frame
+
+
+	if (usec_done == 0) { // first time
+		usec_done = 1;
+		gettimeofday(&tv_prev, 0);
+		return;
+	}
+
+	gettimeofday(&tv_now, 0);
+
+	usec_aim += delta_nom;
+	if (tv_now.tv_sec != tv_prev.tv_sec)
+		usec_done += 1000000;
+	usec_done += tv_now.tv_usec - tv_prev.tv_usec;
+
+#ifdef FRAMESKIP
+	if (FSkip_setting >= 0)
+	{
+		if (skip_count >= FSkip_setting)
+			skip_count = 0;
+		else {
+			skip_count++;
+			FSkip = 1;
+		}
+	}
+	else if (usec_done > usec_aim)
+	{
+		/* auto frameskip */
+		if (usec_done - usec_aim > 150000)
+			usec_done = usec_aim = 0; // too much behind, try to recover..
+		FSkip = 1;
+		tv_prev = tv_now;
+		return;
+	}
+#endif
+
+	tv_prev = tv_now;
+	while (usec_done < usec_aim)
+	{
+		gettimeofday(&tv_now, 0);
+
+		if (tv_now.tv_sec != tv_prev.tv_sec)
+			usec_done += 1000000;
+		usec_done += tv_now.tv_usec - tv_prev.tv_usec;
+		tv_prev = tv_now;
+	}
+	usec_done = usec_done - usec_aim + 1; // reset to prevent overflows
+	usec_aim = 0;
+}
+#endif
+