[Bug 105282] Divinity: Original Sin Enhanced Edition blocky and jagged shadows.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105282

            Bug ID: 105282
           Summary: Divinity: Original Sin Enhanced Edition blocky and
                    jagged shadows.
           Product: Mesa
           Version: 17.3
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: e.singularitycat at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

After working around the bugs described in #93551 and getting the game running,
I noticed that unless the shadow quality setting was at "Ultra", all rendered
shadows are blocky and jagged, with gaps appearing between the shadows cast be
apparently solid objects.

I messed around with some driconf options, and discovered that this rendering
issue goes away if setting the "glsl_correct_derivatives_after_discard" option.

Unfortunately, I couldn't get a working apitrace because of the LD_PRELOAD
hacks, but attached are two screenshots of roughly the same area, one without
the option (before.png) and one with (after.png).

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