[Bug 95466] SSAO doesn't work as expected in Supertuxkart

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95466

            Bug ID: 95466
           Summary: SSAO doesn't work as expected in Supertuxkart
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: deveee at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 123851
  --> https://bugs.freedesktop.org/attachment.cgi?id=123851&action=edit
intel-wall

I am debugging it on STK side, but without success (at least for now).

You can look at the screenshots. It looks badly, especially when you are near
the walls.

It works fine with other drivers, it's just a problem with intel.

You need STK version from current git to reproduce it, because in older
versions there was a problem with compute shaders, which are needed for
bilinear filtering. Or you can probably disable compute shaders extension and
then use STK 0.9.1.

This is rather old bug, initially reported in 2014:
https://github.com/supertuxkart/stk-code/issues/1751

Here is the ssao shader that is used:
https://github.com/supertuxkart/stk-code/blob/master/data/shaders/ssao.frag

It certainly affects intel HD4000. I can't really say if it affects also newer
hardware because I have no possibility to check it.

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