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asahi: fix index bias with GS/XFB

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noticed when bringing up mdi.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26614>
This commit is contained in:
Alyssa Rosenzweig
2023-11-17 17:20:17 -04:00
parent 45ef977481
commit afb60d7707
1 changed files with 7 additions and 9 deletions
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src/asahi/lib/agx_nir_lower_gs.c
+7 -9
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@@ -188,12 +188,7 @@ load_vs_vertex_id(nir_builder *b, struct agx_ia_key *key)
load_primitive_id(b), nir_load_vertex_id_in_primitive_agx(b),
nir_channel(b, nir_load_num_workgroups(b), 0));
/* Add the "start", either an index bias or a base vertex */
id = nir_iadd(b, id, nir_load_first_vertex(b));
/* If drawing with an index buffer, pull the vertex ID. Otherwise, the
* vertex ID is just the index as-is.
*/
/* If drawing with an index buffer, pull the vertex ID. */
if (key->index_size) {
nir_def *index_buffer = load_geometry_param(b, input_index_buffer);
nir_def *offset = nir_imul_imm(b, id, key->index_size);
@@ -201,10 +196,13 @@ load_vs_vertex_id(nir_builder *b, struct agx_ia_key *key)
nir_def *index = nir_load_global_constant(b, address, key->index_size, 1,
key->index_size * 8);
return nir_u2uN(b, index, id->bit_size);
} else {
return id;
id = nir_u2uN(b, index, id->bit_size);
}
/* Add the "start", either an index bias or a base vertex. This must happen
* after indexing for proper index bias behaviour.
*/
return nir_iadd(b, id, nir_load_first_vertex(b));
}
static bool