Comment # 7
on bug 66067
from Grigori Goronzy
This actually seems to be a bug in Trine 2. The fragment shader uses a shadow sampler to sample the normal texture, which is RGBA. This cannot work as shadow sampling is only defined for depth textures. According to the ARB_fragment_program_shadow specification (Trine 2 uses those old assembly-like shaders for some reason), it is undefined behaviour to sample from non-depth textures. Obviously, Trine 2 relies on a certain behavior, i.e. that shadow samplers are silently changed into normal 2D samplers when not sampling from depth textures. I have contacted Frozenbyte support, let's see if they'll do something about. Otherwise we need to check if it is reasonably possible and sensible to implement these undefined cases like other drivers. This might get ugly, though. If you just want to play the game and don't mind hacking mesa, try the nasty patch I attached. This will break other applications, but makes Trine 2 work.
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