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((function faceforward
(signature float
(parameters
(declare (in) float N)
(declare (in) float I)
(declare (in) float Nref))
((if (expression bool < (expression float * (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)))))))
))
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