Implement 'faceforward' builtin.

1 files changed, 37 insertions, 0 deletions

diff --git a/builtins/110/faceforward b/builtins/110/faceforward
new file mode 100644
index 0000000000..d170397238
--- /dev/null
+++ b/builtins/110/faceforward
@@ -0,0 +1,37 @@
+((function faceforward
+   (signature float
+     (parameters
+       (declare (in) float N)
+       (declare (in) float I)
+       (declare (in) float Nref))
+     ((if (expression bool < (expression float dot (var_ref Nref) (var_ref I)) (constant float (0)))
+          ((return (var_ref N)))
+	  ((return (expression float neg (var_ref N)))))))
+
+   (signature vec2
+     (parameters
+       (declare (in) vec2 N)
+       (declare (in) vec2 I)
+       (declare (in) vec2 Nref))
+     ((if (expression bool < (expression float dot (var_ref Nref) (var_ref I)) (constant float (0)))
+          ((return (var_ref N)))
+	  ((return (expression vec2 neg (var_ref N)))))))
+
+   (signature vec3
+     (parameters
+       (declare (in) vec3 N)
+       (declare (in) vec3 I)
+       (declare (in) vec3 Nref))
+     ((if (expression bool < (expression float dot (var_ref Nref) (var_ref I)) (constant float (0)))
+          ((return (var_ref N)))
+	  ((return (expression vec3 neg (var_ref N)))))))
+
+   (signature vec4
+     (parameters
+       (declare (in) vec4 N)
+       (declare (in) vec4 I)
+       (declare (in) vec4 Nref))
+     ((if (expression bool < (expression float dot (var_ref Nref) (var_ref I)) (constant float (0)))
+          ((return (var_ref N)))
+	  ((return (expression vec4 neg (var_ref N)))))))
+))