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Invisible platforms in super mario
http://forums.nesdev.com/viewtopic.php?f=3&t=13079
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Author:  yanos [ Sat Aug 01, 2015 9:48 am ]
Post subject:  Invisible platforms in super mario

Graphically the game looks right, but I have some invisible platform and some hole in walls here and there (example:http://imgur.com/Jg5iUHK). I'm not sure what part of my emu is wrong on this. Could this be a cpu bug?

Author:  zeroone [ Sun Aug 02, 2015 9:39 am ]
Post subject:  Re: Invisible platforms in super mario

yanos wrote:
Could this be a cpu bug?


Does your emulator pass all the CPU test roms?

Author:  yanos [ Sun Aug 02, 2015 11:28 am ]
Post subject:  Re: Invisible platforms in super mario

Yep. except some timing issue that I'm currently trying to fix.

Author:  Zepper [ Sun Aug 02, 2015 2:41 pm ]
Post subject:  Re: Invisible platforms in super mario

Hmm... perhaps PPU mirroring is incorrect?

Author:  yanos [ Sun Aug 02, 2015 4:42 pm ]
Post subject:  Re: Invisible platforms in super mario

I doubt it since if that's the case, EVERYTHING would be wrong. But it's only every so often here and there. It's quite puzzling :(

Author:  zeroone [ Sun Aug 02, 2015 6:21 pm ]
Post subject:  Re: Invisible platforms in super mario

yanos wrote:
I doubt it since if that's the case, EVERYTHING would be wrong. But it's only every so often here and there. It's quite puzzling


It looks like the status bar at the top is cutoff. Does the status bar look correct normally except when this happens?

Author:  Dwedit [ Sun Aug 02, 2015 6:57 pm ]
Post subject:  Re: Invisible platforms in super mario

Double check the RAM implementation, that everything is mirrored correctly, and that addresses are correct.

Author:  James [ Sun Aug 02, 2015 7:10 pm ]
Post subject:  Re: Invisible platforms in super mario

I'm unsure about the "platform", but there's something wrong with your sprite 0 hit detection code.

Author:  yanos [ Mon Aug 03, 2015 6:26 am ]
Post subject:  Re: Invisible platforms in super mario

Yeah, my sprite 0 hit detection is not is bogus, it's just not the priority right now. I'll check my ram implementation and mirroring code in the PPU.

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