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anv/pipeline: use less instructions for multiview 

The view_index is encoded in the remainder of dividing instance id by
the number of views in the view mask (n). In the general case (handled
by the else clause), there is a need to map from 0..n-1 into the
number of the view being masked. For that a map is encoded.

In the case only the first n bits in the mask are set, the mapping is
trivial, 0..n-1 already represent what view is being referred to.

That case was in the original patch that added
anv_nir_lower_multiview.c but disabled.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Caio Marcelo de Oliveira Filho 2018-03-14 16:12:44 -07:00 committed by Jason Ekstrand
parent baeb6a4b4a
commit 5e7c1d05d4
1 changed files with 1 additions and 1 deletions
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2
src/intel/vulkan/anv_nir_lower_multiview.c
View File

@ -86,7 +86,7 @@ build_view_index(struct lower_multiview_state *state)
nir_umod(b, nir_load_instance_id(b),
nir_imm_int(b, _mesa_bitcount(state->view_mask)));
if (0 && util_is_power_of_two(state->view_mask + 1)) {
if (util_is_power_of_two(state->view_mask + 1)) {
/* If we have a full view mask, then compacted is what we want */
state->view_index = compacted;
} else {