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pan/bi: Properly extract primitive facing on v11+

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Since v11, the primitive flags preloaded register define more data.
This changes load_front_face lowering to only use the first bit for
primitive facing.

Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33608>
This commit is contained in:
Mary Guillemard
2025-01-30 11:56:25 +00:00
committed by Marge Bot
parent 20d7c93368
commit 4f989c2cc3
1 changed files with 11 additions and 3 deletions
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src/panfrost/compiler/bifrost_compile.c
+11 -3
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@@ -2071,11 +2071,19 @@ bi_emit_intrinsic(bi_builder *b, nir_intrinsic_instr *instr)
bi_load_sample_id_to(b, dst);
break;
case nir_intrinsic_load_front_face:
/* r58 == 0 means primitive is front facing */
bi_icmp_i32_to(b, dst, bi_preload(b, 58), bi_zero(), BI_CMPF_EQ,
case nir_intrinsic_load_front_face: {
/* (r58 & 1) == 0 means primitive is front facing */
bi_index primitive_facing = bi_preload(b, 58);
/* Starting with v11, there is more fields defined in the primitive flags */
if (b->shader->arch >= 11)
primitive_facing =
bi_lshift_and_i32(b, primitive_facing, bi_imm_u32(1), bi_imm_u8(0));
bi_icmp_i32_to(b, dst, primitive_facing, bi_zero(), BI_CMPF_EQ,
BI_RESULT_TYPE_M1);
break;
}
case nir_intrinsic_load_point_coord:
bi_ld_var_special_to(b, dst, bi_zero(), BI_REGISTER_FORMAT_F32,