radeonsi: handle MultiDrawIndirect in si_get_draw_start_count

Also handle the GL_ARB_indirect_parameters case where the count itself
is in a buffer.

Use transfers rather than mapping the buffers directly. This anticipates
the possibility that the buffers are sparse (once ARB_sparse_buffer is
implemented), in which case they cannot be mapped directly.

Fixes GL45-CTS.gtf43.GL3Tests.multi_draw_indirect.multi_draw_indirect_type
on <= CIK.

v2:
- unmap the indirect buffer correctly
- handle the corner case where we have indirect draws, but all of them
  have count 0.

Cc: [email protected]
Reviewed-by: Marek Olšák <[email protected]>
Acked-by: Edward O'Callaghan <[email protected]>
(cherry picked from commit 6a1d9684f4ec1e1eed49bc14749be7b7784277ec)

0 files changed, 0 insertions, 0 deletions