I apologize if this is a FAQ. Are there other extensions like this,
where the extension string claims it is supported despite there being
no support for it in the hardware? Is there a list somewhere of all
such extensions and the hardware on which they are *really* supported?
Generally not; generally the presence of an extension string will
indicate hardware support for the feature. ARB_imaging comes to mind
as the major example.
Apple also supports the vertex programming extensions (both
ARB_vertex_program and GLSL's ARB_vertex_shader) on hardware that
can't do them in hardware, but in this case the result is usually
"fast enough" anyway, so I don't really take issue with these.
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