1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Ben Parnell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 static uint64 tmethod,tfreq;
22 static uint64 desiredfps;
24 static void RefreshThrottleFPS(void)
26 desiredfps=FCEUI_GetDesiredFPS()>>8;
29 static uint64 GetCurTime(void)
35 /* Practically, LARGE_INTEGER and uint64 differ only by signness and name. */
36 QueryPerformanceCounter((LARGE_INTEGER*)&tmp);
41 return((uint64)GetTickCount());
45 static void InitSpeedThrottle(void)
48 if(QueryPerformanceFrequency((LARGE_INTEGER*)&tfreq))
54 tfreq<<=16; /* Adjustment for fps returned from FCEUI_GetDesiredFPS(). */
58 static void SpeedThrottle(void)
60 static uint64 ttime,ltime;
67 if( (ttime-ltime) < (tfreq/desiredfps) )
69 if( (ttime-ltime) >= (tfreq*4/desiredfps))
72 ltime+=tfreq/desiredfps;