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panfrost: Lower vertex_id for XFB

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Even on Valhall, vertex_id is zero-based in a transform feedback program. Lower
that for transform feedback programs properly since it wouldn't happen
automatically on Valhall. Fixes assertion fails.

Fixes: 91ffd10351 ("pan/bi: Lower gl_VertexID in NIR")
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24198>
This commit is contained in:
Alyssa Rosenzweig 2023-07-19 08:02:22 -04:00 • committed by Marge Bot
parent 539bf3929b
commit 64ff2b3ed6
1 changed files with 14 additions and 0 deletions
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14
src/panfrost/util/pan_lower_xfb.c
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@ -65,6 +65,20 @@ lower_xfb(nir_builder *b, nir_instr *instr, UNUSED void *data)
return false;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
/* In transform feedback programs, vertex ID becomes zero-based, so apply
* that lowering even on Valhall.
*/
if (intr->intrinsic == nir_intrinsic_load_vertex_id) {
b->cursor = nir_instr_remove(instr);
nir_ssa_def *repl =
nir_iadd(b, nir_load_vertex_id_zero_base(b), nir_load_first_vertex(b));
nir_ssa_def_rewrite_uses(&intr->dest.ssa, repl);
return true;
}
if (intr->intrinsic != nir_intrinsic_store_output)
return false;