void ScummEngine_v4::o4_oldRoomEffect() {
int a;
_opcode = fetchScriptByte();
if ((_opcode & 0x1F) == 3) {
a = getVarOrDirectWord(PARAM_1);
#if 1
if (_game.platform == Common::kPlatformFMTowns && _game.version == 3) {
// FIXME / TODO: OK the first thing to note is: at least in Zak256,
// maybe also in other games, this opcode does a bit more. I added
// some stubs here, but somebody with a full IDA or more knowledge
// about this will have to fill in the gaps. At least now we know
// that something is missing here :-)
if (a == 4) {
//printf("o5_oldRoomEffect ODDBALL: _opcode = 0x%x, a = 0x%x\n", _opcode, a);
// No idea what byte_2FCCF is, but it's a globale boolean flag.
// I only add it here as a temporary hack to make the pseudo code compile.
// Maybe it is just there as a reentry protection guard, given
// how it is used? It might also correspond to _screenEffectFlag.
int byte_2FCCF = 0;
// For now, we force a redraw of the screen background. This
// way the Zak end credits seem to work mostly correct.
VirtScreen *vs = &_virtscr[kMainVirtScreen];
restoreBackground(Common::Rect(0, vs->topline, vs->w, vs->topline + vs->h));
vs->setDirtyRange(0, vs->h);
updateDirtyScreen(kMainVirtScreen);
if (byte_2FCCF) {
// Here now "sub_1C44" is called, which sets byte_2FCCF to 0 then
// calls yet another sub (which also reads byte_2FCCF):
byte_2FCCF = 0;
//call sub_0BB3
// Now sub_085C is called. This is quite simply: it sets
// 0xF000 bytes. starting at 0x40000 to 0. No idea what that
// buffer is, maybe a screen buffer, though. Note that
// 0xF000 = 320*192.
// Maybe this is also the charset mask being cleaned?
// call sub_085C
// And then sub_1C54 is called, which is almost identical to
// the above sub_1C44, only it sets byte_2FCCF to 1:
byte_2FCCF = 1;
// call sub_0BB3
} else {
// Here only sub_085C is called (see comment above)
// call sub_085C
}
return;
}
#endif
}
if (a) {
_switchRoomEffect = (byte)(a & 0xFF);
_switchRoomEffect2 = (byte)(a >> 8);
} else {
