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((function refract
(signature float
(parameters
(declare (in) float i)
(declare (in) float n)
(declare (in) float eta))
((declare () float k)
(assign (constant bool (1)) (x) (var_ref k)
(expression float - (constant float (1.0))
(expression float * (var_ref eta)
(expression float * (var_ref eta)
(expression float - (constant float (1.0))
(expression float *
(expression float * (var_ref n) (var_ref i))
(expression float * (var_ref n) (var_ref i))))))))
(if (expression bool < (var_ref k) (constant float (0.0)))
((return (constant float (0.0))))
((return (expression float -
(expression float * (var_ref eta) (var_ref i))
(expression float *
(expression float +
(expression float * (var_ref eta)
(expression float * (var_ref n) (var_ref i)))
(expression float sqrt (var_ref k)))
(var_ref n))))))))
(signature vec2
(parameters
(declare (in) vec2 i)
(declare (in) vec2 n)
(declare (in) float eta))
((declare () float k)
(assign (constant bool (1)) (x) (var_ref k)
(expression float - (constant float (1.0))
(expression float * (var_ref eta)
(expression float * (var_ref eta)
(expression float - (constant float (1.0))
(expression float *
(expression float dot (var_ref n) (var_ref i))
(expression float dot (var_ref n) (var_ref i))))))))
(if (expression bool < (var_ref k) (constant float (0.0)))
((return (constant vec2 (0.0 0.0))))
((return (expression vec2 -
(expression vec2 * (var_ref eta) (var_ref i))
(expression vec2 *
(expression float +
(expression float * (var_ref eta)
(expression float dot (var_ref n) (var_ref i)))
(expression float sqrt (var_ref k)))
(var_ref n))))))))
(signature vec3
(parameters
(declare (in) vec3 i)
(declare (in) vec3 n)
(declare (in) float eta))
((declare () float k)
(assign (constant bool (1)) (x) (var_ref k)
(expression float - (constant float (1.0))
(expression float * (var_ref eta)
(expression float * (var_ref eta)
(expression float - (constant float (1.0))
(expression float *
(expression float dot (var_ref n) (var_ref i))
(expression float dot (var_ref n) (var_ref i))))))))
(if (expression bool < (var_ref k) (constant float (0.0)))
((return (constant vec3 (0.0 0.0 0.0))))
((return (expression vec3 -
(expression vec3 * (var_ref eta) (var_ref i))
(expression vec3 *
(expression float +
(expression float * (var_ref eta)
(expression float dot (var_ref n) (var_ref i)))
(expression float sqrt (var_ref k)))
(var_ref n))))))))
(signature vec4
(parameters
(declare (in) vec4 i)
(declare (in) vec4 n)
(declare (in) float eta))
((declare () float k)
(assign (constant bool (1)) (x) (var_ref k)
(expression float - (constant float (1.0))
(expression float * (var_ref eta)
(expression float * (var_ref eta)
(expression float - (constant float (1.0))
(expression float *
(expression float dot (var_ref n) (var_ref i))
(expression float dot (var_ref n) (var_ref i))))))))
(if (expression bool < (var_ref k) (constant float (0.0)))
((return (constant vec4 (0.0 0.0 0.0 0.0))))
((return (expression vec4 -
(expression vec4 * (var_ref eta) (var_ref i))
(expression vec4 *
(expression float +
(expression float * (var_ref eta)
(expression float dot (var_ref n) (var_ref i)))
(expression float sqrt (var_ref k)))
(var_ref n))))))))
))
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