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Fixed VBLANK end time computation -- it wasn't taking into account games that use MDRV_SCREEN_VBLANK_TIME

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Aaron, could you please double check what I did?
This commit is contained in:
Zsolt Vasvari 2008-03-12 11:43:31 +00:00
parent 4eecf5199d
commit 839e3f073c
1 changed files with 26 additions and 5 deletions
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31
src/emu/video.c
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@ -66,6 +66,7 @@ struct _internal_screen_state
attoseconds_t pixeltime; /* attoseconds per pixel */
attoseconds_t vblank_period; /* attoseconds per VBLANK period */
attotime vblank_start_time; /* time of last VBLANK start */
attotime vblank_end_time; /* time of last VBLANK end */
emu_timer * vblank_begin_timer; /* timer to signal VBLANK start */
emu_timer * vblank_end_timer; /* timer to signal VBLANK end */
emu_timer * scanline0_timer; /* scanline 0 timer */
@ -341,6 +342,7 @@ void video_init(running_machine *machine)
/* reset VBLANK timing */
internal_state->vblank_start_time = attotime_zero;
internal_state->vblank_end_time = attotime_make(0, internal_state->vblank_period);
/* allocate a timer to generate per-scanline updates */
if (machine->config->video_attributes & VIDEO_UPDATE_SCANLINE)
@ -1075,7 +1077,20 @@ attotime video_screen_get_time_until_vblank_start(const device_config *screen)
attotime video_screen_get_time_until_vblank_end(const device_config *screen)
{
return video_screen_get_time_until_pos(screen, video_screen_get_visible_area(screen)->min_y, 0);
attotime ret;
screen_state *state = get_safe_token(screen);
internal_screen_state *internal_state = (internal_screen_state *)state->private_data;
attotime current_time = timer_get_time();
/* we are in the VBLANK region, compute the time until the end of the current VBLANK period */
if (attotime_compare(current_time, internal_state->vblank_end_time) < 0)
ret = attotime_sub(internal_state->vblank_end_time, current_time);
/* otherwise computer the time until the next VBLANK period */
else
ret = attotime_sub(attotime_add_attoseconds(internal_state->vblank_end_time, internal_state->frame_period), current_time);
return ret;
}
@ -1256,12 +1271,13 @@ DEVICE_GET_INFO( video_screen )
static TIMER_CALLBACK( vblank_begin_callback )
{
int i;
const device_config *screen = ptr;
device_config *screen = ptr;
screen_state *state = get_safe_token(screen);
internal_screen_state *internal_state = (internal_screen_state *)state->private_data;
/* reset the starting VBLANK time */
internal_state->vblank_start_time = timer_get_time();
internal_state->vblank_end_time = attotime_add_attoseconds(internal_state->vblank_start_time, internal_state->vblank_period);
/* call the screen specific callbacks */
for (i = 0; internal_state->vbl_cbs[i] != NULL; i++)
@ -1271,9 +1287,14 @@ static TIMER_CALLBACK( vblank_begin_callback )
if ((screen == machine->primary_screen) && !(machine->config->video_attributes & VIDEO_UPDATE_AFTER_VBLANK))
video_frame_update(machine, FALSE);
/* reset the timers */
timer_adjust_oneshot(internal_state->vblank_begin_timer, attotime_make(0, internal_state->frame_period), 0);
timer_adjust_oneshot(internal_state->vblank_end_timer, video_screen_get_time_until_vblank_end(screen), 0);
/* reset the VBLANK start timer for the next frame */
timer_adjust_oneshot(internal_state->vblank_begin_timer, video_screen_get_time_until_vblank_start(screen), 0);
/* if no VBLANK period, call the VBLANK end callback immedietely, otherwise reset the timer */
if (internal_state->vblank_period == 0)
vblank_end_callback(machine, screen, 0);
else
timer_adjust_oneshot(internal_state->vblank_end_timer, video_screen_get_time_until_vblank_end(screen), 0);
}