static void alpha_row_update(int scanline)
{
data16_t *check = &atarigen_alpha[(scanline / 8) * 64 + 42];
/* check for interrupts in the alpha ram */
/* the interrupt occurs on the HBLANK of the 6th scanline following */
if (check < &atarigen_alpha[0x7c0] && (*check & 0x8000))
timer_set(cpu_getscanlineperiod() * 6.9, 0, irq_gen);
/* update the playfield and motion objects */
skullxbo_scanline_update(scanline);
}
void skullxbo_state::scanline_update(screen_device &screen, int scanline)
{
/* check for interrupts in the alpha ram */
/* the interrupt occurs on the HBLANK of the 6th scanline following */
int offset = (scanline / 8) * 64 + 42;
if (offset < 0x7c0 && (m_alpha_tilemap->basemem_read(offset) & 0x8000))
{
int width = screen.width();
attotime period = screen.time_until_pos(screen.vpos() + 6, width * 0.9);
m_scanline_timer->adjust(period);
}
/* update the playfield and motion objects */
skullxbo_scanline_update(scanline);
}
static void alpha_row_update(running_machine *machine, int scrnum, int scanline)
{
UINT16 *check = &atarigen_alpha[(scanline / 8) * 64 + 42];
/* check for interrupts in the alpha ram */
/* the interrupt occurs on the HBLANK of the 6th scanline following */
if (check < &atarigen_alpha[0x7c0] && (*check & 0x8000))
{
attotime period = video_screen_get_time_until_pos(scrnum, video_screen_get_vpos(scrnum) + 6, machine->screen[scrnum].width * 0.9);
timer_set(period, NULL, 0, irq_gen);
}
/* update the playfield and motion objects */
skullxbo_scanline_update(scanline);
}
static void alpha_row_update(screen_device &screen, int scanline)
{
skullxbo_state *state = screen.machine().driver_data<skullxbo_state>();
UINT16 *check = &state->m_alpha[(scanline / 8) * 64 + 42];
/* check for interrupts in the alpha ram */
/* the interrupt occurs on the HBLANK of the 6th scanline following */
if (check < &state->m_alpha[0x7c0] && (*check & 0x8000))
{
int width = screen.width();
attotime period = screen.time_until_pos(screen.vpos() + 6, width * 0.9);
screen.machine().scheduler().timer_set(period, FUNC(irq_gen));
}
/* update the playfield and motion objects */
skullxbo_scanline_update(screen.machine(), scanline);
}
