Bug 16195 - GL_ARB_fragment_program implement incorrect about state of fragment.fogcoord
Summary: GL_ARB_fragment_program implement incorrect about state of fragment.fogcoord
Status: VERIFIED FIXED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i915 (show other bugs)
Version: unspecified
Hardware: Other Linux (All)
: medium normal
Assignee: haihao
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Depends on: 10788
Blocks:
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Reported: 2008-06-02 02:28 UTC by WuNian
Modified: 2008-06-05 23:34 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

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Description WuNian 2008-06-02 02:28:12 UTC 
The bug exists in mesa_7_0 branch now.

+++ This bug was initially created as a clone of Bug #10788 +++

In extension GL_ARB_fragment_program, the components value of fragment.fogcoord are (f, 0, 0, 1), but Mesa assign the components value as (f, f, f, f).

For example:
Call glProgramStringARB with program string:
"!!ARBfp1.0\nATTRIB state_param = fragment.fogcoord;\nMOV result.color, state_param;\n\nEND";
and set the fog coord as 0.6, then draw a quads, the pixel color should be (0.6, 0, 0, 1) instead of (0.6, 0.6, 0.6, 0.6);
Comment 1 Brian Paul 2008-06-02 08:30:39 UTC 
Looks like the fix for this was recently committed to the 7.0 branch (see f59267d650961ea536bf790cce905747202cca6d).  I also applied it to the i915tex driver.

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