[Bug 102581] 3D texture mipmapping broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102581

            Bug ID: 102581
           Summary: 3D texture mipmapping broken
           Product: Mesa
           Version: 17.1
          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: mail at felix-potthast.de
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 134041
  --> https://bugs.freedesktop.org/attachment.cgi?id=134041&action=edit
Screenshot comparison

When trying to display 
https://www.shadertoy.com/view/4llcR4
i get artifacts near horizon due to mipmapping (artifacts are absent with
mipmapping disabled).
It works as expected with the proprietary driver (under Windows) on the same
machine.
See attached image for Screenshot comparison.

So either mipmap generation or display seems to be erroneous for 3D textures.

My card is AMD Radeon HD 7870.

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