ARB (minimum extensions, no
specular highlights, no vertex programs)
R200 (full featured, almost always
single pass interaction rendering)
ARB2 (floating point fragment shaders,
minor quality improvements, always single pass).
NV10 (full featured, five
rendering passes, no vertex programs)
NV20 (full featured, two or three
rendering passes)
NV30 ( full featured, single pass)
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