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-rw-r--r--src/mesa/state_tracker/st_pbo.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_pbo.c b/src/mesa/state_tracker/st_pbo.c
index 2c63c092ed5..1ded58392c1 100644
--- a/src/mesa/state_tracker/st_pbo.c
+++ b/src/mesa/state_tracker/st_pbo.c
@@ -333,7 +333,8 @@ st_pbo_create_vs(struct st_context *st)
ureg_scalar(in_instanceid, TGSI_SWIZZLE_X));
} else {
/* out_layer = gl_InstanceID */
- ureg_MOV(ureg, out_layer, in_instanceid);
+ ureg_MOV(ureg, ureg_writemask(out_layer, TGSI_WRITEMASK_X),
+ ureg_scalar(in_instanceid, TGSI_SWIZZLE_X));
}
}