Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/gen8_ps_state.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/gen8_ps_state.c
b/src/mesa/drivers/dri/i965/gen8_ps_state.c
index e93668e..57bf053 100644
--- a/src/mesa/drivers/dri/i965/gen8_ps_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_ps_state.c
@@ -187,6 +187,24 @@ upload_ps_state(struct brw_context *brw)
if (brw->wm.prog_data->prog_offset_16)
dw6 |= GEN7_PS_16_DISPATCH_ENABLE;
+ /* From the documentation for this packet:
+ * "If the PS kernel does not need the Position XY Offsets to
+ * compute a Position Value, then this field should be programmed
+ * to POSOFFSET_NONE."
+ *
+ * "SW Recommendation: If the PS kernel needs the Position Offsets
+ * to compute a Position XY value, this field should match Position
+ * ZW Interpolation Mode to ensure a consistent position.xyzw
+ * computation."
+ *
+ * We only require XY sample offsets. So, this recommendation doesn't
+ * look useful at the moment. We might need this in future.
+ */
+ if (brw->wm.prog_data->uses_pos_offset)
+ dw6 |= GEN7_PS_POSOFFSET_SAMPLE;
+ else
+ dw6 |= GEN7_PS_POSOFFSET_NONE;
+
dw7 |=
brw->wm.prog_data->first_curbe_grf << GEN7_PS_DISPATCH_START_GRF_SHIFT_0
|
brw->wm.prog_data->first_curbe_grf_16<<
GEN7_PS_DISPATCH_START_GRF_SHIFT_2;
--
1.8.4.2
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