This used to work by luck because the current DGC prepare shader
is using one descriptor set and it was the currently bound compute
shader... Using two descriptor sets or starting from 1 would just fail.
For indirect compute pipelines, descriptors must be emitted from the
DGC shader because there is no bound compute pipeline at all. This
solution is using indirect descriptor sets because it's much shorter
and easier to implement. This could be improved but nothing uses
indirect compute pipelines and this is like experimental stuff.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29700>
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