i965/fs: Only read output_components many components when writing an output

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index cea16e0b325..8b61c867602 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -974,8 +974,10 @@ fs_visitor::emit_urb_writes()
                sources[length++] = reg;
             }
          } else {
-            for (int i = 0; i < 4; i++)
+            for (int i = 0; i < output_components[varying]; i++)
                sources[length++] = offset(this->outputs[varying], bld, i);
+            for (int i = output_components[varying]; i < 4; i++)
+               sources[length++] = fs_reg(0);
          }
          break;
       }