static BYTE sid_read_chip(WORD addr, int chipno)
{
int val = -1;
addr &= 0x1f;
machine_handle_pending_alarms(0);
#ifdef HAVE_MOUSE
if (chipno == 0 && (addr == 0x19 || addr == 0x1a)) {
if ((maincpu_clk ^ pot_cycle) & ~511) {
pot_cycle = maincpu_clk & ~511; /* simplistic 512 cycle sampling */
if (_mouse_enabled) {
val_pot_x = mouse_get_x();
val_pot_y = mouse_get_y();
} else if (lightpen_enabled) {
val_pot_x = lightpen_read_button_x();
val_pot_y = lightpen_read_button_y();
} else {
val_pot_x = 0xff;
val_pot_y = 0xff;
}
}
val = (addr == 0x19) ? val_pot_x : val_pot_y;
} else
#endif
{
if (machine_class == VICE_MACHINE_C64SC
|| machine_class == VICE_MACHINE_SCPU64) {
/* On x64sc, the read/write calls both happen before incrementing
the clock, so don't mess with maincpu_clk here. */
val = sid_read_func(addr, chipno);
} else {
/* Account for that read functions in VICE are called _before_
incrementing the clock. */
maincpu_clk++;
val = sid_read_func(addr, chipno);
maincpu_clk--;
}
}
/* Fallback when sound is switched off. */
if (val < 0) {
if (addr == 0x19 || addr == 0x1a) {
val = 0xff;
} else {
if (addr == 0x1b || addr == 0x1c) {
val = maincpu_clk % 256;
} else {
val = 0;
}
}
}
lastsidread = val;
return val;
}
BYTE vic_read(WORD addr)
{
addr &= 0xf;
switch (addr) {
case 3:
return ((VIC_RASTER_Y(maincpu_clk + vic.cycle_offset) & 1) << 7)
| (vic.regs[3] & ~0x80);
case 4:
return VIC_RASTER_Y(maincpu_clk + vic.cycle_offset) >> 1;
case 6:
return vic.light_pen.x;
case 7:
return vic.light_pen.y;
#ifdef HAVE_MOUSE
case 8:
if (_mouse_enabled) {
return mouse_get_x();
} else if (lightpen_enabled) {
return lightpen_read_button_x();
} else {
return 0xff;
}
break;
case 9:
if (_mouse_enabled) {
return mouse_get_y();
} else if (lightpen_enabled) {
return lightpen_read_button_y();
} else {
return 0xff;
}
break;
#else
case 8:
case 9:
return 0xff;
#endif
default:
return vic.regs[addr];
}
}
