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Shash DeSmuMe WIP

November 18th, 2006, 14:47 Posted By: wraggster

Shash has posted more of his WIP from the DeSmuMe - DS Emulator for Windows:

I fixed quite a large amount of bugs, but the 2 most important ones, would be the ones from topic: texture coordinate generation and flickering.

The first one is quite simple, as most PC hardware, the DS supports texture coordinate generation. This is used, for example, if you want to have a pool with water, the water being a texture mapped plane, and want it to seem to wave: instead of having a large amount of geometry, just generate the texture coordinates varying to get the visual effect of waving. I had made an implemention long ago, but I always found samples which rendered wrong, and then when I fixed one of them, another was broken. The bug was rather stupid: as openGL and DS texcoord generation doesn't map 1:1, I just pre-transformed them, and then sent them to openGL. The problem, was that I was not resetting the texture matrix, and as a such, at last they got pre-transformed by me, and then transformed by openGL. Stupid bug of the year, for sure.

Flickering was a damn annoying bug, which I never got enough motivation to fix, it "just" involved retrieving the openGL framebuffer, then copying it to BG0, and send it to the layering pipeline that desmume uses. Sounds simple, in fact it's simple to implement, but the code is ugly, probably slower than it should be, and, by the fact it has to be transformed from 24bit to 16bit, it looks a bit uglier (as in the DS, :P)

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