i965: Enable channel masks in Ivybridge's URB_WRITE_HWORD header.

This shouldn't be done using MRFs, but until I have a proper solution
for dealing with MRFs, this allows my hack to keep working.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 8a7bcfc5db2d6471ecaa215bf3771a7a984e2deb..528b907520eec0c9ea30db6a2b6529ee5399a349 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -2180,6 +2180,14 @@ void brw_urb_WRITE(struct brw_compile *p,
 
    gen6_resolve_implied_move(p, &src0, msg_reg_nr);
 
+   if (intel->gen == 7) {
+      /* Enable Channel Masks in the URB_WRITE_HWORD message header */
+      brw_OR(p, retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE, msg_reg_nr, 5),
+                      BRW_REGISTER_TYPE_UD),
+               retype(brw_vec1_grf(0, 5), BRW_REGISTER_TYPE_UD),
+               brw_imm_ud(0xff00));
+   }
+
    insn = next_insn(p, BRW_OPCODE_SEND);
 
    assert(msg_length < BRW_MAX_MRF);