Research texture dumping and un-tiling about decaf-emu

[brett19]

If you want to try and get something like this working (loading of textures onto GPU, or to disk), I'm sure that would be immensely helpful. I would honestly suggest the Mesa R600 driver or a cleaned up version of the EveryFileExplorer source (converted to C++ as well).

[exjam]

None of the games I have testing have got to the point of rendering so I have not actually done much research into the graphics side of things. I know there is a (binary only) tool out there called TexConv2 which will translate .GTX textures to .DDS.

That EveryFileExplorer seems pretty suitable due to being targeted to the WiiU, and from the code it clearly was all reversed from what I assume was TexConv2.

Although it is nice to have a texture -> bitmap dumper, for emulation I only really care about being able to unswizzle/untile to a format that OpenGL can render directly (e.g. gtx can unswizzle to DXT5 and there is no need for us to write a DXT5 decoder as you can pass it straight to hardware using the s3tc extension).

[zhuowei]

Since I couldn't get AddrLib to work, I tried making the Mesa code work for dxt5 textures by looking at how AddrLib does the microtile swizzling for dxt5 textures and by grabbing the parameters from EveryFileExplorer; the result is https://github.com/zhuowei/wiiu-tools/blob/master/untile/main.cpp.

It managed to unswizzle one 128x128 dxt5 texture from Amiibo Settings, but didn't work for the two dxt1 textures.

(Also, Amiibo Settings boots to the point of issuing draw calls if you stub out OSSleepTicks and the missing ErrEula methods, so that might be a good test app)

[brett19]

Hey @zhuowei,
Have you made any more progress with unswizzling/untiling? We are starting to look at processing of textures for rendering.
P.S. It's possible the failure to work on DXT1 textures is related to the default swizzle/tile mode being different for these textures (there is some fields that come with a GX2Surface related to tiling/swizzling).
Cheers, Brett

[ADormant]

@exjam Could this feature be used for texture replacement like in Dolphin?

[exjam]

Turns out it was very similar to the r600 but with added bank rotation, swizzle, swapping and channel rotation. It's now implemented :).

f4fe207