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authorEric Anholt <[email protected]>2009-08-03 17:12:43 -0700
committerEric Anholt <[email protected]>2009-08-03 17:19:03 -0700
commite340d4f9866db4bae391288e83a630a310b0dd2b (patch)
tree5224e24f08d198fab9cdb1d37f89a047d1ebf426 /src
parente93848e595176ae0bad3bfe64e0ca63fd089bb72 (diff)
i965: Even if no VS inputs are set, still load some amount of URB as required.
See comment on Vertex URB Entry Read Length for VS_STATE. This, combined with the previous three commits, fixes #22945.
Diffstat (limited to 'src')
-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 d27b1c89bdd..722307c0150 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -129,6 +129,11 @@ 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. The non-position outputs go straight into message regs.
*/
@@ -221,6 +226,12 @@ 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.