Bug 1509

Summary: VIA: GL_ADD is broken
Product: Mesa Reporter: Ian Romanick <idr>
Component: Drivers/DRI/UnichromeAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED WONTFIX QA Contact:
Severity: normal    
Priority: high CC: xavier
Version: git   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on: 1508    
Bug Blocks:    

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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