blitz3d/gxruntime/gxtimer.cpp

#include "std.h"
#include "gxtimer.h"
#include "gxruntime.h"

gxTimer::gxTimer( gxRuntime *rt,int hertz ):
runtime(rt),ticks_get(0),ticks_put(0){
	event=CreateEvent( 0,false,false,0 );
	timerID=timeSetEvent( 1000/hertz,0,timerCallback,(DWORD)this,TIME_PERIODIC );
}

gxTimer::~gxTimer(){
	timeKillEvent( timerID );
	CloseHandle( event );
}

void CALLBACK gxTimer::timerCallback( UINT id,UINT msg,DWORD user,DWORD dw1,DWORD dw2 ){
	gxTimer *t=(gxTimer*)user;
	++t->ticks_put;
	SetEvent( t->event );
}

int gxTimer::wait(){
	for(;;){
		if( WaitForSingleObject( event,1000 )==WAIT_OBJECT_0 ) break;
	}
	int n=ticks_put-ticks_get;
	ticks_get+=n;
	return n;
}