void blstroid_scanline_update(screen_device &screen, int scanline) { blstroid_state *state = screen.machine->driver_data<blstroid_state>(); int offset = (scanline / 8) * 64 + 40; /* check for interrupts */ if (offset < 0x1000) if (state->playfield[offset] & 0x8000) { int width, vpos; attotime period_on; attotime period_off; /* FIXME: - the only thing this IRQ does it tweak the starting MO link */ /* unfortunately, it does it too early for the given MOs! */ /* perhaps it is not actually hooked up on the real PCB... */ return; /* set a timer to turn the interrupt on at HBLANK of the 7th scanline */ /* and another to turn it off one scanline later */ width = screen.width(); vpos = screen.vpos(); period_on = screen.time_until_pos(vpos + 7, width * 0.9); period_off = screen.time_until_pos(vpos + 8, width * 0.9); timer_set(screen.machine, period_on, NULL, 0, irq_on); timer_set(screen.machine, period_off, NULL, 0, irq_off); } }
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(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); }