Implement 'refract' builtin.
diff --git a/builtin_function.cpp b/builtin_function.cpp
index c75805c..377fd509 100644
--- a/builtin_function.cpp
+++ b/builtin_function.cpp
@@ -1718,6 +1718,111 @@
"))\n"
};
+static const char *builtins_110_refract = {
+ "((function refract\n"
+ " (signature float\n"
+ " (parameters\n"
+ " (declare (in) float i)\n"
+ " (declare (in) float n)\n"
+ " (declare (in) float eta))\n"
+ " ((declare () float k)\n"
+ " (assign (constant bool (1)) (var_ref k)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * \n"
+ " (expression float dot (var_ref n) (var_ref i))\n"
+ " (expression float dot (var_ref n) (var_ref i))))))))\n"
+ " (if (expression bool < (var_ref k) (constant float (0.0)))\n"
+ " ((return (constant float (0.0))))\n"
+ " ((return (expression float -\n"
+ " (expression float * (var_ref eta) (var_ref i))\n"
+ " (expression float *\n"
+ " (expression float +\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float dot (var_ref n) (var_ref i)))\n"
+ " (expression float sqrt (var_ref k)))\n"
+ " (var_ref n))))))))\n"
+ "\n"
+ " (signature vec2\n"
+ " (parameters\n"
+ " (declare (in) vec2 i)\n"
+ " (declare (in) vec2 n)\n"
+ " (declare (in) float eta))\n"
+ " ((declare () float k)\n"
+ " (assign (constant bool (1)) (var_ref k)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * \n"
+ " (expression float dot (var_ref n) (var_ref i))\n"
+ " (expression float dot (var_ref n) (var_ref i))))))))\n"
+ " (if (expression bool < (var_ref k) (constant float (0.0)))\n"
+ " ((return (constant vec2 (0.0 0.0))))\n"
+ " ((return (expression vec2 -\n"
+ " (expression vec2 * (var_ref eta) (var_ref i))\n"
+ " (expression vec2 *\n"
+ " (expression float +\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float dot (var_ref n) (var_ref i)))\n"
+ " (expression float sqrt (var_ref k)))\n"
+ " (var_ref n))))))))\n"
+ "\n"
+ " (signature vec3\n"
+ " (parameters\n"
+ " (declare (in) vec3 i)\n"
+ " (declare (in) vec3 n)\n"
+ " (declare (in) float eta))\n"
+ " ((declare () float k)\n"
+ " (assign (constant bool (1)) (var_ref k)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * \n"
+ " (expression float dot (var_ref n) (var_ref i))\n"
+ " (expression float dot (var_ref n) (var_ref i))))))))\n"
+ " (if (expression bool < (var_ref k) (constant float (0.0)))\n"
+ " ((return (constant vec3 (0.0 0.0))))\n"
+ " ((return (expression vec3 -\n"
+ " (expression vec3 * (var_ref eta) (var_ref i))\n"
+ " (expression vec3 *\n"
+ " (expression float +\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float dot (var_ref n) (var_ref i)))\n"
+ " (expression float sqrt (var_ref k)))\n"
+ " (var_ref n))))))))\n"
+ "\n"
+ " (signature vec4\n"
+ " (parameters\n"
+ " (declare (in) vec4 i)\n"
+ " (declare (in) vec4 n)\n"
+ " (declare (in) float eta))\n"
+ " ((declare () float k)\n"
+ " (assign (constant bool (1)) (var_ref k)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float - (constant float (1.0))\n"
+ " (expression float * \n"
+ " (expression float dot (var_ref n) (var_ref i))\n"
+ " (expression float dot (var_ref n) (var_ref i))))))))\n"
+ " (if (expression bool < (var_ref k) (constant float (0.0)))\n"
+ " ((return (constant vec4 (0.0 0.0))))\n"
+ " ((return (expression vec4 -\n"
+ " (expression vec4 * (var_ref eta) (var_ref i))\n"
+ " (expression vec4 *\n"
+ " (expression float +\n"
+ " (expression float * (var_ref eta)\n"
+ " (expression float dot (var_ref n) (var_ref i)))\n"
+ " (expression float sqrt (var_ref k)))\n"
+ " (var_ref n))))))))\n"
+ "\n"
+ "))\n"
+};
+
static const char *builtins_110_sign = {
"((function sign\n"
" (signature float\n"
@@ -2379,6 +2484,7 @@
builtins_110_pow,
builtins_110_radians,
builtins_110_reflect,
+ builtins_110_refract,
builtins_110_sign,
builtins_110_sin,
builtins_110_smoothstep,