[Bug 108919] Parkitect (Unity Game) dispalys artifacts and black screens with Vega hardware

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108919

            Bug ID: 108919
           Summary: Parkitect (Unity Game) dispalys artifacts and black
                    screens with Vega hardware
           Product: Mesa
           Version: 18.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: yovejuyas at moruzza.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 142689
  --> https://bugs.freedesktop.org/attachment.cgi?id=142689&action=edit
Screenshot of one of the possible outcomes of starting the game

Issue: Vega hardware not working with Parkitect. The game is based on Unity.
Lots of artifacts, particularly with ambient occlusion turned up in game's
settings 
Steps to reproduce: Start a game in parkitect with Vega hardware. Turn the
graphics settings to max and you will experience issues.

Sometimes it's playable, but always with artifacts

Happy to provide logs and feedback.

Some notes: 
https://www.reddit.com/r/ThemeParkitect/comments/a0oboe/black_screen_on_linux_with_rx_vega_56/

Tested this with Mesa 18.2.4 and 18.3 in Fedora 29 (also had issues in Fedora
28).

Happy to donate a copy of the game to a known dev.

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