Mesa (glsl2): glsl2: When linking makes a variable not a varying output, make it ir_var_auto.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: c10a68522c400d48553dbd473b9778140842d9dd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c10a68522c400d48553dbd473b9778140842d9dd

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Jul 13 11:07:16 2010 -0700

glsl2: When linking makes a variable not a varying output, make it ir_var_auto.

This almost fixes glsl-unused-varying, except that the used varying
gets assigned to the first varying slot (position).

---

 src/glsl/linker.cpp |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 90dc97b..c71c07d 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -1052,7 +1052,10 @@ assign_varying_locations(gl_shader *producer, gl_shader *consumer)
       /* An 'out' variable is only really a shader output if its value is read
        * by the following stage.
        */
-      var->shader_out = (var->location != -1);
+      if (var->location == -1) {
+	 var->shader_out = false;
+	 var->mode = ir_var_auto;
+      }
    }
 
    foreach_list(node, consumer->ir) {