Bug 19122 - [965 OGLC] fog coordinates are not properly passed to fragment programs
Summary: [965 OGLC] fog coordinates are not properly passed to fragment programs
Status: RESOLVED FIXED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i965 (show other bugs)
Version: git
Hardware: All All
: medium normal
Assignee: Ian Romanick
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Blocks: intel-3d-release
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Reported: 2008-12-16 17:07 UTC by Ian Romanick
Modified: 2009-08-24 12:31 UTC (History)
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Description Ian Romanick 2008-12-16 17:07:25 UTC 
The (new) piglit test fp-fog shows this bug.  The fragment.fogcoord state variable is supposed to contain {f, 0, 0, 1}.  On 965 it seems to be getting {f, 1, GARBAGE, 0}.  See the output from fp-fog:

GL_RENDERER = Mesa DRI Intel(R) 965GM GEM 20080716
0.5, 1.5 => { 0.298039 1.000000 0.000000 0.000000 }
1.5, 1.5 => { 0.600000 1.000000 0.000000 0.000000 }
0.5, 0.5 => { 0.800000 1.000000 0.082353 0.000000 }
1.5, 0.5 => { 0.400000 1.000000 0.000000 0.000000 }
Comment 1 Eric Anholt 2009-03-23 22:58:08 UTC 
commit 411d913ccea362dbd75411266d7abb685214ee93
Author: Eric Anholt <eric@anholt.net>
Date:   Mon Mar 23 22:35:03 2009 -0700

    i965: Fix fog coordinate g,b,a values when glFrontFacing isn't used.
    
    Previously, we would sample (f,glFrontFacing,undef,undef) instead of the
    (f,0,0,1) that fragment.fogcoord is supposed to return.  Due to
    glFrontFacing's presence in FOGC.y, we'll still give bad results there when
    glFrontFacing is used.
    
    Bug #19122, piglit testcase fp-fog.
Comment 2 Adam Jackson 2009-08-24 12:31:20 UTC 
Mass version move, cvs -> git

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