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Re: GL_COMBINE 2 Textures

On Nov 3, 2004, at 12:06 PM, bsupnik wrote:
This all gets a lot trickier if you want (100% of A + 30% of B) * local_lighting...

On that note, is there a clever way to interpolate two textures and then modulate by local vertex lighting, in one pass with two texture units, on a Rage128? I ask the list because this is a current question on idevgames. Obviously you can do it with crossbar but that isn't available on all hardware.


I don't know about the crossbar extension

About crossbar, I just tried it out in the lab yesterday, and it appears to work on all nvidia cards despite not being exported. Now, I understand that the reason for not exporting the extension is due to wording of the invalid/unbound texture case, and this is resolved in the 1.4 spec by saying that the behavior is undefined. However the current nvidia drivers only implement GL 1.1 or 1.3, so is it really safe to use TEXTUREn sources? Or must I fool around with texture combiners to be safe?


thanks,
-alex

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