1 files changed, 102 insertions, 0 deletions
diff --git a/src/glsl/builtins/110/refract b/src/glsl/builtins/110/refract
new file mode 100644
index 0000000000..e9b1475294
--- /dev/null
+++ b/src/glsl/builtins/110/refract
@@ -0,0 +1,102 @@
+((function refract
+   (signature float
+     (parameters
+       (declare (in) float i)
+       (declare (in) float n)
+       (declare (in) float eta))
+     ((declare () float k)
+      (assign (constant bool (1)) (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 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 dot (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)) (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)) (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))))
+	  ((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)) (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))))
+	  ((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))))))))
+
+))