Bug 1509 - VIA: GL_ADD is broken
Summary: VIA: GL_ADD is broken
Status: RESOLVED WONTFIX
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/Unichrome (show other bugs)
Version: git
Hardware: x86 (IA32) Linux (All)
: high normal
Assignee: Default DRI bug account
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Depends on: 1508
Blocks:
  Show dependency tree / graph
 
Reported: 2004-10-01 12:54 UTC by Ian Romanick
Modified: 2014-01-22 01:41 UTC (History)
1 user (show)

See Also:
i915 platform:
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Description Ian Romanick 2004-10-01 12:54:59 UTC 
At least for GL_ALPHA textures, to code for GL_ADD is *identical* to the code
for GL_MODULATE.  Based on the understanding of the Unichrome hardware that I've
been able to gather by examining the code, the implementation of GL_MODULATE is
correct.  That means that the implementation of GL_ADD must be wrong.

The real "fix" for this bug will be to replace the classic texture environment
code, which includes GL_ADD (via GL_ARB_texture_env_add), with derived
GL_COMBINE state.
Comment 1 Adam Jackson 2009-08-24 12:22:43 UTC 
Mass version move, cvs -> git
Comment 2 Ian Romanick 2014-01-22 01:41:01 UTC 
This driver was removed from the repository some years ago.

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