'offset change' in mode 2 SNES!?!

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Main - ROM Hacking - 'offset change' in mode 2 SNES!?!

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cory21391

Posted on 07-25-07 01:21 AM

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just wondering what it's purpose is and how it works. aparently some of the tiles in the tilemap are changed, misaligning the GFX tiles. idk why this is needing or wanted at all, but i was just wondering.

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Dwedit

Posted on 07-25-07 07:21 AM

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Are you talking about that "Offsets per tile mode" thing which drives Tetris Attack?

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smkdan

Posted on 07-25-07 08:06 AM

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^{[citation needed]}

Dwedit

Posted on 07-25-07 02:51 PM

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I highly doubt that, BG3 is 4 colors only.

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Raccoon Sam

Posted on 07-25-07 03:00 PM

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Posted by Dwedit
I highly doubt that, BG3 is 4 colors only.

Unless it has a crazy HDMA that goes beyond those 4 colors.

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smkdan

Posted on 07-25-07 03:14 PM

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I had a closer look at it in the dev manual.

BG3's display limitations has nothing to do with it. BG3 is not displayed at all, it looks like it just uses the BG3 tilemap pointer to point to a set of scroll values for each corresponding tile on BG1/BG2 as defined in the 'tilemap' bytes that would normally be used for BG3 display.

cory21391: A closer look on the mode is on page 208 on book1.pdf.

cory21391

Posted on 07-25-07 09:35 PM

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and here iwas thinking it just changed the tiles' locations in the tilemap... sounds like an interesting (and time consuming) feature... I'll have to read up on it in the dev manual

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MathOnNapkins

Posted on 07-25-07 10:21 PM

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I'd also recommend reading Anomie's Register Doc and looking up "Mode 2". The official manual is usually more confusing to read, and I use it as a backup source.

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Main - ROM Hacking - 'offset change' in mode 2 SNES!?!

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