vkQuake introduced using specialization constants in this version
From that version vkQuake is not being rendered correctly on Intel/Vulkan.
I've described the bug here:
The workaround described here might be helpful in debugging this https://github.com/Novum/vkQuake/issues/50#issuecomment-238071652
tracked down to a bug in the spirv->nir conversion code. patches to nir have been posted to mesa-dev list.
retest with latest vkQuake and mesa-git, this is fixed
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