https://bugs.freedesktop.org/show_bug.cgi?id=109532
--- Comment #51 from asimiklit <andrey.simik...@gmail.com> ---
We have one more answer from Piers Daniell:
"We discussed this in the OpenGL/ES working group meeting and agreed that
eliminating unused elements from the interface block array is not desirable.
There is no statement in the spec that this takes place and it would be
highly
implementation dependent if it happens. If the application has an
"interface" in
the shader they need to match up with the API it would be quite confusing to
have
the binding point get compacted. So the answer is no, the binding points
aren't
affected by unused elements in the interface block array."
So looks like according to it we should remove this optimization at all.
Regardless whether explicit or implicit case we should not optimize it.
I guess we can remove this optimization for 'packed' blocks by
removing this exclusive cases and just handle it like 'std140' and 'shared'
layouts:
https://gitlab.freedesktop.org/mesa/mesa/blob/master/src/compiler/glsl/link_uniform_block_active_visitor.cpp#L254-261
and
https://gitlab.freedesktop.org/mesa/mesa/blob/master/src/compiler/glsl/link_uniform_block_active_visitor.cpp#L170-171
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