i965: Fix alpha testing when there is no color buffer in the FBO.

We were alpha testing against an unwritten value, resulting in garbage.
(part of) Bug #35073.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm.h b/src/mesa/drivers/dri/i965/brw_wm.h
index d9cae75ab5..90771e1f50 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.h
+++ b/src/mesa/drivers/dri/i965/brw_wm.h
@@ -64,6 +64,7 @@ struct brw_wm_prog_key {
    GLuint linear_color:1;  /**< linear interpolation vs perspective interp */
    GLuint nr_color_regions:5;
    GLuint render_to_fbo:1;
+   GLuint alpha_test:1;
 
    GLbitfield proj_attrib_mask; /**< one bit per fragment program attribute */
    GLuint shadowtex_mask:16;