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Author Topic: How may we create arbitrary sprites with ACE in Generation II?  (Read 193 times)

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Evie the Mother Hen ☽ ❤

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How may we create arbitrary sprites with ACE in Generation II?
« on: January 28, 2019, 06:33:35 am »
https://glitchcity.info/wiki/Arbitrary_sprites

I want us to be able to do this with arbitrary code execution in Generation II but I'm unsure where to start, wondering if anyone has any ideas (would be much appreciated  :))? I checked the Egg's backsprite but I was under the impression it was sourced from ROM, however I could have been mistaken. Thanks in advance! ✿

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Re: How may we create arbitrary sprites with ACE in Generation II?
« Reply #1 on: January 28, 2019, 07:34:29 am »
Use a disasm to see where the sprite decompression routine is, then set an access breakpoint at the beginning of it in BGBto find the pointer to the backsprite.


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Evie the Mother Hen ☽ ❤

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Re: How may we create arbitrary sprites with ACE in Generation II?
« Reply #2 on: January 28, 2019, 08:21:12 am »
Use a disasm to see where the sprite decompression routine is, then set an access breakpoint at the beginning of it in BGBto find the pointer to the backsprite.

Thanks for the input. I did something like that but I think it seemed Egg back was in ROM. By using the debugger it would be possible to change the registers though (but I was thinking more of a ACE method; with the debugger we can just edit VRAM).

Possibly maybe we could call the routine(s) to display a sprite (modified if necessary with a copy of it in RAM). As a last resort, we could call CopyData to write bytes into VRAM itself when it is unlocked. ✿

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(Images © Sanrio, Nintendo, Pokémon, HAL Laboratory)

✿ Hi, I'm Evie. Transgender woman but spiritually doesn't believe 'male'/'female' needs to be defined; lives more stereotypically like a woman/I'm a 'girly' nerd who discovered herself. Call me whichever pronouns you like. :)

Feel free to contact me here about anything regarding the site.

Forgiveness. I feel that the more people pray to our greatest source/God/mathematical equality for world peace, the more and more it manifests into reality (until our next spiritual death).

Thank you Nyapon for this lovely artwork. :3