glsl: Add a helper function for determining if an rvalue could be a saturate.

Hardware pretty commonly has saturate modifiers on instructions, and
this can be used in codegen to produce those, without everyone else
needing to understand clamping other than min and max.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index be0da07b3b..850033b185 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -144,6 +144,8 @@ public:
       return this;
    }
 
+   ir_rvalue *as_rvalue_to_saturate();
+
    virtual bool is_lvalue()
    {
       return false;