summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--src/mesa/drivers/dri/i965/brw_vs_emit.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index 6792c3a34e..b95079a5d1 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -124,6 +124,11 @@ static void brw_vs_alloc_regs( struct brw_vs_compile *c )
reg++;
}
}
+ /* If there are no inputs, we'll still be reading one attribute's worth
+ * because it's required -- see urb_read_length setting.
+ */
+ if (c->nr_inputs == 0)
+ reg++;
/* Allocate outputs: TODO: could organize the non-position outputs
* to go straight into message regs.
@@ -201,6 +206,12 @@ static void brw_vs_alloc_regs( struct brw_vs_compile *c )
* vertex urb, so is half the amount:
*/
c->prog_data.urb_read_length = (c->nr_inputs + 1) / 2;
+ /* Setting this field to 0 leads to undefined behavior according to the
+ * the VS_STATE docs. Our VUEs will always have at least one attribute
+ * sitting in them, even if it's padding.
+ */
+ if (c->prog_data.urb_read_length == 0)
+ c->prog_data.urb_read_length = 1;
/* The VS VUEs are shared by VF (outputting our inputs) and VS, so size
* them to fit the biggest thing they need to.