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https://freedesktop.org/bugzilla/show_bug.cgi?id=1509        
   
           Summary: GL_ADD is broken
           Product: Mesa
           Version: CVS
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Drivers/DRI/Unichrome
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]
 BugsThisDependsOn: 1508


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.        
   
   
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