The check for ctx->API was unnecessary, because OES extensions are not exposed
in desktop GL.
Also require renderbuffer support for ARB_texture_rgb10_a2ui,
as per the spec.
Tested by comparing old and new glxinfo with softpipe and r600g.
v2: fix bugs
v3: rename need_only_one -> need_at_least_one
rename num_elements -> num_mappings
add comments
use const when appropriate
Reviewed-by: Brian Paul <brianp@vmware.com>
Marek Olšák
41a4e274a4