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A shader has values that are per vextex and values that are per call.

Can you have values that vary only per triangle or quad

And can you have values that vary only per pair. Of indicies in a glmultielementsdraw or equiv?

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Maybe you can use glVertexAttribDivisor: opengl.org/sdk/docs/man4/xhtml/glVertexAttribDivisor.xml- but I don't know, if it will work with ordinary draw commands (without instanced drawing). – zacharmarz May 22 '11 at 11:12
@zacharmarz that ought to go in an answer so it can be enlarged upon; it looks promising, I hadn't seen that before; it would require all bits I drew to be the same size, of course, but using it to give different transform for each unit and draw an army of the same unit, then it might be great! – Will May 23 '11 at 6:42

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