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etnaviv: add support for occlusion queries
Passes most occlusion query piglits. The following piglits are broken:
- spec@arb_occlusion_query@occlusion_query_meta_fragments
- spec@arb_occlusion_query@occlusion_query_meta_save
- spec@arb_occlusion_query2@render
v1 -> v2:
- use one sample provider for all occlusion queries tyes
- add comment about 'magic' value 0x1DF5E76
Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Wladimir J. van der Laan <laanwj@gmail.com>