static mame_time choose_delay(unicode_char_t ch)
{
subseconds_t delay = 0;
if (current_rate.seconds || current_rate.subseconds)
return current_rate;
if (queue_chars)
{
/* systems with queue_chars can afford a much smaller delay */
delay = DOUBLE_TO_SUBSECONDS(0.01);
}
else
{
switch(ch) {
case '\r':
delay = DOUBLE_TO_SUBSECONDS(0.2);
break;
default:
delay = DOUBLE_TO_SUBSECONDS(0.05);
break;
}
}
return make_mame_time(0, delay);
}
mame_time video_screen_get_time_until_pos(int scrnum, int vpos, int hpos)
{
mame_time curdelta = sub_mame_times(mame_timer_get_time(), scrinfo[scrnum].vblank_time);
subseconds_t targetdelta;
assert(curdelta.seconds == 0);
/* since we measure time relative to VBLANK, compute the scanline offset from VBLANK */
vpos += Machine->screen[scrnum].height - (Machine->screen[scrnum].visarea.max_y + 1);
vpos %= Machine->screen[scrnum].height;
/* compute the delta for the given X,Y position */
targetdelta = (subseconds_t)vpos * scrinfo[scrnum].scantime + (subseconds_t)hpos * scrinfo[scrnum].pixeltime;
/* if we're past that time, head to the next frame */
if (targetdelta <= curdelta.subseconds)
targetdelta += DOUBLE_TO_SUBSECONDS(TIME_IN_HZ(Machine->screen[scrnum].refresh));
/* return the difference */
return make_mame_time(0, targetdelta - curdelta.subseconds);
}
