Bug 16195

Summary: GL_ARB_fragment_program implement incorrect about state of fragment.fogcoord
Product: Mesa Reporter: WuNian <nian.wu>
Component: Drivers/DRI/i915Assignee: haihao <haihao.xiang>
Status: VERIFIED FIXED QA Contact:
Severity: normal    
Priority: medium CC: dri-devel
Version: unspecified   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on: 10788    
Bug Blocks:    

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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