SpritesMind.Net

I have an issue in my emulator where during gameplay in Virtual FighterII, there are corrupted characters across the first few lines of pattern A.

I'm pretty sure it's not a dma emulation problem, so I might have a mask problem or something wrong in my pattern render code, but for the life of me I can't see anything obvious.

Does anyone know if there is any special pattern map address or tile address masking or something else that I might be missing?

cheers,
Steve.

Hey Steve,

It's almost certainly the window. Remember that BGA is masked wherever the window is.

Ah - that totally makes sense.

So if there are non transparent BGA tiles behind a window which contains transparent tiles (ie. has color index zero in them), then BGA will not be visible, but BGB instead? (Assuming BGB is lower pri than BGA).

(Assuming BGB is lower pri than BGA).

The window basically replaces BGA, so if the window is transparent, you see BGB through it - regardless of priority.

Got it. And adding correct BGA window masking fixed the problem.

Thanks so much Mr.Snake!