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cubexx: GBC performance issues and grid alignment problems #16

@nchapman

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@nchapman

Performance Issue:
GBC runs poorly on cubexx with patched panel. Super obvious in Link's Awakening room transitions.

Gamma has a fix: https://github.com/TheGammaSqueeze/rgxx_boot_package_mods/tree/rgcubexx
However, the change is so extreme that the simple patching method can't handle it (due to fudged checksum approach).

Grid Alignment Issue:
Aspect ratio + grid scaling has alignment issues on cubexx, even when aspect equals integer. Probably due to blindly overscaling when integer scaling would suffice.


Originally tracked in todo.txt#L109-L118

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