[Piglit] [Mesa-dev] [PATCH] piglit/general/texunits: fix to check the correct extension and be less pedantic

[Brian Paul]

Luca Barbieri wrote:
>> I think the real source of difficulty is that you don't have to opt-in
>> to extensions.  This makes it easy for application developers to
>> accidentally rely on extension behavior that is supported on their
>> development machine.  When the code is run on a different system, it may
>> mysteriously fail.
> 
> Yes, indeed.
> Conceivably we could have a mechanism to let the developer force Mesa
> extensions off.

The MESA_EXTENSION_OVERRIDE env var lets you disable GL extensions for 
testing purposes, etc.  Ex:

export MESA_EXTENSION_OVERRIDE=-GL_ARB_vertex_shader

will disable GL_ARB_vertex_shader (note the '-').

-Brian