Mark some variables as having usage beyond the shader's scope.

This will be important to optimization passes.  We don't want to
dead-code eliminate writes to out varyings, or propagate uninitialized
values of uniforms.

1 files changed, 6 insertions, 0 deletions

diff --git a/ir.h b/ir.h
index 471e19b43d..cb153be77d 100644
--- a/ir.h
+++ b/ir.h
@@ -151,6 +151,12 @@ public:
    unsigned read_only:1;
    unsigned centroid:1;
    unsigned invariant:1;
+   /** If the variable is initialized outside of the scope of the shader */
+   unsigned shader_in:1;
+   /**
+    * If the variable value is later used outside of the scope of the shader.
+    */
+   unsigned shader_out:1;
 
    unsigned mode:3;
    unsigned interpolation:2;