87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
#include "sdl.h"
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#include "throttle.h"
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static uint64 tfreq;
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static uint64 desiredfps;
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static int32 fps_scale_table[]=
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{ 3, 3, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 2048 };
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int32 fps_scale = 256;
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#define fps_table_size (sizeof(fps_scale_table)/sizeof(fps_scale_table[0]))
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void RefreshThrottleFPS(void)
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{
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desiredfps=FCEUI_GetDesiredFPS()>>8;
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desiredfps=(desiredfps*fps_scale)>>8;
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tfreq=10000000;
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tfreq<<=16; /* Adjustment for fps returned from FCEUI_GetDesiredFPS(). */
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}
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void SpeedThrottle(void)
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{
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static uint64 ttime,ltime=0;
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waiter:
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ttime=SDL_GetTicks();
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ttime*=10000;
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if( (ttime-ltime) < (tfreq/desiredfps) )
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{
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int64 delay;
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delay=(tfreq/desiredfps)-(ttime-ltime);
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if(delay>0)
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SDL_Delay(delay/10000);
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//printf("%d\n",(tfreq/desiredfps)-(ttime-ltime));
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//SDL_Delay((tfreq/desiredfps)-(ttime-ltime));
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goto waiter;
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}
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if( (ttime-ltime) >= (tfreq*4/desiredfps))
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ltime=ttime;
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else
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ltime+=tfreq/desiredfps;
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}
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void IncreaseEmulationSpeed(void)
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{
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int i;
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for(i=1; fps_scale_table[i]<fps_scale; i++)
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;
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fps_scale = fps_scale_table[i+1];
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RefreshThrottleFPS();
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FCEU_DispMessage("emulation speed %d%%",(fps_scale*100)>>8);
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}
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void DecreaseEmulationSpeed(void)
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{
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int i;
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for(i=1; fps_scale_table[i]<fps_scale; i++)
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;
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fps_scale = fps_scale_table[i-1];
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RefreshThrottleFPS();
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FCEU_DispMessage("emulation speed %d%%",(fps_scale*100)>>8);
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}
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void FCEUD_SetEmulationSpeed(int cmd)
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{
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switch(cmd)
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{
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case EMUSPEED_SLOWEST: fps_scale=fps_scale_table[0]; break;
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case EMUSPEED_SLOWER: DecreaseEmulationSpeed(); break;
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case EMUSPEED_NORMAL: fps_scale=256; break;
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case EMUSPEED_FASTER: IncreaseEmulationSpeed(); break;
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case EMUSPEED_FASTEST: fps_scale=fps_scale_table[fps_table_size-1]; break;
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default:
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return;
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}
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RefreshThrottleFPS();
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FCEU_DispMessage("emulation speed %d%%",(fps_scale*100)>>8);
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}
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