[tor-bugs] #20858 [Applications/Tor Browser Sandbox]: Make webgl work with forced software rendering.

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#20858: Make webgl work with forced software rendering.
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 Reporter:  yawning                           |          Owner:  yawning
     Type:  defect                            |         Status:  new
 Priority:  Medium                            |      Milestone:
Component:  Applications/Tor Browser Sandbox  |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:                                    |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by yawning):

 Ok, I have this working, though finding `swrast_dri.so` is going to be
 annoying for the general case.

  * `LIBGL_ALWAYS_SOFTWARE=1`
  * Do the library enumeration thing for `swrast_dri.so` (Arch:
 `/usr/lib/xorg/dri`, Fedora: `/usr/lib64/dri`, probably somewhere else on
 Debian because fuck you).
  * Put `swrast_dri.so` somewhere sensible.
  * `LIBGL_DRIVERS_PATH=<somewhere sensible`

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20858#comment:1>
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