np2/timing.c - diff

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version 1.5, 2003/12/08 00:55:30	version 1.7, 2004/02/09 20:39:39
Line 5	Line 5
#include "timing.h"	#include "timing.h"


	#define MSSHIFT 16

typedef struct {	typedef struct {
UINT32 tick;	UINT32 tick;
	UINT32 msstep;
UINT cnt;	UINT cnt;
UINT32 fraction;	UINT32 fraction;
} TIMING;	} TIMING;
Line 21 void timing_reset(void) {	Line 24 void timing_reset(void) {
timing.fraction = 0;	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) {

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

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

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