According to the "URB SIMD8 Write > Write Data Payload" documentation,
"The write data payload can be between 1 and 8 message phases long."
Apparently, the simulator considers it an error if you issue an URB
SIMD8 message with only a header and no actual data to write.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 9a4bad6..7074b5c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1800,14 +1800,13 @@ fs_visitor::emit_urb_writes(gl_clip_plane *clip_planes)
/* If we don't have any valid slots to write, just do a minimal urb write
* send to terminate the shader. */
if (vue_map->slots_valid == 0) {
-
- fs_reg payload = fs_reg(GRF, alloc.allocate(1), BRW_REGISTER_TYPE_UD);
+ fs_reg payload = fs_reg(GRF, alloc.allocate(2), BRW_REGISTER_TYPE_UD);
bld.exec_all().MOV(payload, fs_reg(retype(brw_vec8_grf(1, 0),
BRW_REGISTER_TYPE_UD)));
fs_inst *inst = bld.emit(SHADER_OPCODE_URB_WRITE_SIMD8, reg_undef,
payload);
inst->eot = true;
- inst->mlen = 1;
+ inst->mlen = 2;
inst->offset = 1;
return;
}
--
1.7.10.4
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