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determining texture memory for a specific context

I want to figure out how much texture memory is available to my renderer, so I can switch to 16-bit textures automatically on older systems.

To get this, I need aglDescribeRenderer, which needs an AGLRendererInfo structure. However, I see no way to get an AGLRendererInfo structure for my particular pixelformat/context/drawable. The closest seems to be to use aglQueryRendererInfo and then walk through it looking for an AGL_RENDERER_ID match.

But I don't think that will work, because OS9, where I most need this, often returns the wrong AGL_RENDERER_ID, and even if that worked, the user might have two cards that differed only in texture memory, and I don't know how to distinguish which one would be the right one.

Clue for the clueless, anyone?

Thanks.

-jrr
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