np2/timing.c - diff

Return to timing.c CVS log

Up to [RetroPC.NET] / np2

version 1.3, 2003/10/23 12:58:44	version 1.7, 2004/02/09 20:39:39
Line 5	Line 5
#include "timing.h"	#include "timing.h"


static UINT timercnt = 0;	#define MSSHIFT 16
static UINT32 tick = 0;
static UINT32 cnt = 0;	typedef struct {
	UINT32 tick;
	UINT32 msstep;
	UINT cnt;
	UINT32 fraction;
	} TIMING;

	static TIMING timing;


void timing_reset(void) {	void timing_reset(void) {

cnt = 0;	timing.tick = GETTICK();
timercnt = 0;	timing.cnt = 0;
tick = GETTICK();	timing.fraction = 0;
	}

	void timing_setrate(UINT lines, UINT crthz) {

	timing.msstep = (crthz << (MSSHIFT - 3)) / lines / (1000 >> 3);
}	}

void timing_setcount(UINT value) {	void timing_setcount(UINT value) {

timercnt = value;	timing.cnt = value;
}	}

UINT timing_getcount(void) { // ver0.12 60.0Hz вк 56.4Hz	UINT timing_getcount(void) {

UINT32 ticknow;	UINT32 ticknow;
UINT32 span;	UINT32 span;
UINT steps;	UINT32 fraction;

ticknow = GETTICK();	ticknow = GETTICK();
span = ticknow - tick;	span = ticknow - timing.tick;
if (span) {	if (span) {
	timing.tick = ticknow;
fddmtr_callback(ticknow);	fddmtr_callback(ticknow);

tick = ticknow;	if (span >= 1000) {
if (span < 1000) {	span = 1000;
cnt += (span * 388);
steps = cnt / 6875;
timercnt += steps;
cnt -= (steps * 6875);
}
else {
cnt = 0;
timercnt += 56;
}	}
	fraction = timing.fraction + (span * timing.msstep);
	timing.cnt += fraction >> MSSHIFT;
	timing.fraction = fraction & ((1 << MSSHIFT) - 1);
}	}
return(timercnt);	return(timing.cnt);
}	}

void timing_term(void) {	void timing_term(void) {

RetroPC.NET-CVS <cvs@retropc.net>