[Bug 10423] New: shader_glsl_lit() glitch

http://bugs.winehq.org/show_bug.cgi?id=10423

Summary: shader_glsl_lit() glitch
           Product: Wine
           Version: CVS/GIT
          Platform: All
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: wine-directx-d3d
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=9117)
 --> (http://bugs.winehq.org/attachment.cgi?id=9117)
Restore the src.x>0 conditional

Some objects in Civ4 (and other games) are rendered incorrectly as a solid
colour (using the nvidia 100.14.19 driver). A git bisection identified 
commit 468309e055b5e14f6da919b173eb199954b65ef1
Author: Stefan Dösinger 
Date:   Sun Oct 28 21:21:24 2007 +0100

wined3d: Get rid of the conditionals in the glsl lit implementation.

as the first bad commit. Applying the reverted patch to head confirms that it
is the same issue. Reading the patch it would appear to be an incorrect
transformation if the GLSL specification of pow() defines 0^0 as 1 (my edition
of the orange book does not specify its behavior).