Decode Gals Panic II RLE compression

[angelosa]

Gals Panic II has a RGB555 layer that is unused except on POST, making it a candidate for a MCU service.

There's no clear pattern in slave ROMs therefore it's possible that Kaneko used a RLE scheme, given the complexity of the protection itself sounds worth intel even if it ends that the MCU is completely responsible for the task.

[galibert]

Are the communications with the mcu understood at that point? I rmemeber *mumble* years ago they weren't... OG.

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On Sun, Oct 27, 2019 at 7:20 PM Angelo Salese ***@***.***> wrote: Gals Panic II <https://github.com/mamedev/mame/blob/master/src/mame/drivers/galpani2.cpp> has a RGB555 layer that is unused except on POST, making it a candidate for a MCU service. There's no clear pattern in slave ROMs therefore it's possible that Kaneko used a RLE <https://github.com/mamedev/mame/blob/master/src/mame/video/sknsspr.cpp#L53> scheme, given the complexity of the protection itself sounds worth intel even if it ends that the MCU is completely responsible for the task. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#5816?email_source=notifications&email_token=ACGSF4IEMFTSQSHGS7WPVRLQQXET7A5CNFSM4JFSZ4DKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HUTZIBQ>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACGSF4IF7UNITKK55JEGDWTQQXET7ANCNFSM4JFSZ4DA> .

fwiw I also believe that the bitmaps are a different resolution than the other layers, so there's going to be some funky mixing to handle too.

[angelosa]

Game just send commands for displaying whatever background other than the POST ones. That's the easy part since we can just probe it out and eventually a pointer table is hidden somewhere.

The hard part is that there must be some kind of gameplay logic that must be populated somehow, i.e. it's currently impossible to clear a level because you can get just ~2% in gameplay and I'm gonna assume the remaining 98% is populated after background decoding.