Mesa (master): vc4: Fix point size handling when it's the first output.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 2b9c3bace78aaf0728e40b4b4cf7124e6a138696
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2b9c3bace78aaf0728e40b4b4cf7124e6a138696

Author: Eric Anholt <eric at anholt.net>
Date:   Thu Jan 29 11:33:42 2015 -0800

vc4: Fix point size handling when it's the first output.

---

 src/gallium/drivers/vc4/vc4_program.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index 9f1f018..3f0de2c 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -1931,7 +1931,7 @@ emit_point_size_write(struct vc4_compile *c)
 {
         struct qreg point_size;
 
-        if (c->output_point_size_index)
+        if (c->output_point_size_index != -1)
                 point_size = c->outputs[c->output_point_size_index + 3];
         else
                 point_size = qir_uniform_f(c, 1.0);