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

diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index 9f1f01836fd0b573ff2298634e269a9116f15070..3f0de2caee1dc0233402cf068595d2ea9577f8b3 100644 (file)
--- 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);