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brw: Pass write back register for ray query messages

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For DG2 (Bspec 47937) has the same programming note as of Xe2+,

   "When this bit is set in the header, Trace Ray Message behaves like a
   Ray Query. This message requires a write-back message indicating
   RayQuery for all valid Rays (SIMD lanes) have completed."

So this patch is just passing a write back destination register when we
have ray query message.

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41039>
This commit is contained in:
Sagar Ghuge 2026-04-17 21:29:48 -07:00 • committed by Marge Bot
parent 64bc538f5e
commit 620835926d
1 changed files with 2 additions and 4 deletions
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6
src/intel/compiler/brw/brw_from_nir.cpp
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@ -5848,15 +5848,13 @@ brw_from_nir_emit_intrinsic(nir_to_brw_state &ntb,
srcs[RT_LOGICAL_SRC_TRACE_RAY_CONTROL] = get_nir_src(ntb, instr->src[2], 0);
srcs[RT_LOGICAL_SRC_SYNCHRONOUS] = brw_imm_ud(synchronous);
/* Bspec 57508: Structure_SIMD16TraceRayMessage:: RayQuery Enable
/* Bspec 57508, 47937: Structure_SIMD16TraceRayMessage:: RayQuery Enable
*
* "When this bit is set in the header, Trace Ray Message behaves like
* a Ray Query. This message requires a write-back message indicating
* RayQuery for all valid Rays (SIMD lanes) have completed."
*/
brw_reg dst = (devinfo->ver >= 20 && synchronous) ?
bld.vgrf(BRW_TYPE_UD) :
bld.null_reg_ud();
brw_reg dst = synchronous ? bld.vgrf(BRW_TYPE_UD) : bld.null_reg_ud();
bld.emit(RT_OPCODE_TRACE_RAY_LOGICAL, dst, srcs, RT_LOGICAL_NUM_SRCS);