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agx: fix xfb of invalid var

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KHR-Single-GL44.enhanced_layouts.xfb_capture_struct

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26963>
This commit is contained in:
Alyssa Rosenzweig 2024-01-01 09:16:35 -04:00
parent e0c1776187
commit a20c693b7f
1 changed files with 5 additions and 1 deletions
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6
src/asahi/lib/agx_nir_lower_gs.c
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@ -641,9 +641,13 @@ write_xfb(nir_builder *b, struct lower_gs_state *state, unsigned stream,
/* We write out the vertices backwards, since 0 is the current
* emitted vertex (which is actually the last vertex).
*
* We handle NULL var for
* KHR-Single-GL44.enhanced_layouts.xfb_capture_struct.
*/
unsigned v = (verts - 1) - vert;
nir_def *value = nir_load_var(b, state->outputs[output.location][v]);
nir_variable *var = state->outputs[output.location][v];
nir_def *value = var ? nir_load_var(b, var) : nir_undef(b, 4, 32);
/* In case output.component_mask contains invalid components, write
* out zeroes instead of blowing up validation.