glsl: Add a method to tell whether a built-in is available.

We can simply call the stored predicate function.  If state is NULL,
just report that the function is available.

v2: Add a comment (requested by Paul Berry).

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index a927e90ca1f..bd1c12cd90a 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -686,6 +686,9 @@ public:
    /** Whether or not this function signature is a built-in. */
    bool is_builtin() const;
 
+   /** Whether or not a built-in is available for this shader. */
+   bool is_builtin_available(const _mesa_glsl_parse_state *state) const;
+
    /** Body of instructions in the function. */
    struct exec_list body;