[Bug 31810] New: r600g: Sampling from an alpha texture in a fragment shader

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31810

           Summary: r600g: Sampling from an alpha texture in a fragment
                    shader
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: otaylor@redhat.com


Created an attachment (id=40447)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40447)
piglit patch described

The attach piglit addition works on g600c and softpipe fails on r600g.

(The test is close to minimal, but not having diagnosed the bug
I don't know if "sampling from an alpha texture" is the fundamental
thing that needs to be tested or not... or there could even be failing
piglit tests elsewhere that are showing the same problem.)

The TGSI looks right:

DCL IN[0], COLOR, LINEAR
DCL IN[1], GENERIC[0], PERSPECTIVE
DCL OUT[0], COLOR
DCL SAMP[0]
DCL TEMP[0]
  0: TEX TEMP[0], IN[1], SAMP[0], 2D
  1: MUL OUT[0], IN[0], TEMP[0].wwww
  2: END
VERT

Despite spending a lot of time fooling around this yesterday and checking
what I thought were the obvious things I really have no idea what is going
on; hopefully it will be obvious for someone more familiar with the R700
shader code.

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