[Mesa-dev] MESA and KOTOR

[Federico Dossena]

Hello everyone,
you may remember that a few months ago I was trying to fix KOTOR to work 
with Mesa to use the Gallium llvmpipe software renderer.

Well, it's been a while and I'm happy to see that things are a bit 
better with Mesa 17.2. The game still crashes, but we're closer to 
fixing it.

Here's what I found using 17.2.1:
With frame buffer effects and soft shadows the game crashes at the end 
of loading; the crash is inside a function that amongst other things, 
generates mipmaps for a texture used in a pbuffer (function at offset 
2FB37D in my exe).
The crash happens when gluBuild2DMipmaps is called, however doesn't seem 
to be a null pointer like it was back in march: it's an access violation 
alright but no longer a null pointer. So I think it's a different, 
hopefully simpler, problem.

Back in march, Miklòs Màté suggested that changing the checks for the 
pixel format could fix the problem, and he was right; without those 
checks we definitely got a step closer to fixing it.

My first thought was to just NOP the entire section that generates 
mipmaps and a bit of code later that uses it. The game no longer 
crashes, however it displays nothing, but I can hear it running in 
background. So this is the last issue! We're almost there!

Now, I'm bothering you again because I think that at this point it's 
just a problem with the texture format used there. The call to 
gluBuild2DMipmaps uses LuminanceAlpha' as texture format as well as 
internal format (0x190a). I tried changing it to RGB and RGBA just to 
try something, but that didn't work because I guess the texture was 
already generated with another format.

What could I do to investigate this further? And where should I look 
inside Mesa if I wanted to say... force a specific texture format for 
pbuffers?

I feel that we're very close to fixing this. Your help would mean the 
world to me and the whole KOTOR community.

Thank you ;)

P.S.
This has nothing to do with mesa, but you should know that KOTOR is 
slowly dieing. It is currently unplayable on Intel and AMD graphics, and 
recent nVidia driver updates have introduced a glitch with 
transparencies (it can be fixed, but still, no one can play KOTOR on 
modern hardware properly and we have to keep old computers as dedicated 
"shrines" for KOTOR, that's why I insist so much on Mesa)

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