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I'm in the process of adding support for vertex shaders generating clip
distances.  This is part of NV_vertex_program2 and GLSL 1.30.  The
natural way to do that is to add 6 entries to the gl_vert_result enum:
one for each clip plane.  However, doing so increases the number of
vertex outputs from 31 to 37.  This won't fit in a GLbitfield, and an
assertion is triggered during context creation.

My intention is to convert OutputsWritten from a GLbitfield to a
uint64_t.  This will precipitate a giant pile of changes across the
whole *...@ing tree.  Before I dive into this, is this the right way to
do this?
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