Before I installed the Padoka PPA RBDOOM3BFG worked fine, but afterwards I get this corruption on screen. I'm using 64-bit Mint 18.2 on a Radeon HD 7850.
Here's an image of it in action.
Here's what I reported to the RBDOOM3BFG github.
Please find out what version of Mesa was working vs the Padoka PPA version and add that to this bug report. To get that you can use:
glxinfo | grep OpenGL
From there it would be very helpful if you could build mesa from source and do a git bisect to discover the commit that caused the regression. You can get assistance with this on the freenode #radeon IRC channel if you need it.
To be honest I'm not sure what version it worked. On my laptop which runs a Radeon HD 6000 series GPU, also ran fine a few weeks ago, and then this started to happen after an update. Removing the Padoka PPA will fix the problem as well, but then I revert to whatever comes with Mint 18.2.
Anyway this is what my laptop says, but it also has the same problem as my desktop with the Radeon HD 7850. I'll see what I can do about finding which version it worked.
OpenGL vendor string: X.Org
OpenGL renderer string: AMD CEDAR (DRM 2.50.0 / 4.12.5-041205-generic, LLVM 6.0.0)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 17.3.0-devel - padoka PPA
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 17.3.0-devel - padoka PPA
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 17.3.0-devel - padoka PPA
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:
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This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/192.