Implement "cross" builtin.

diff --git a/builtins/110/cross b/builtins/110/cross
new file mode 100644 (file)
index 0000000..deb2f95
--- /dev/null
+++ b/builtins/110/cross
@@ -0,0 +1,17 @@
+((function cross
+   (signature vec3
+     (parameters
+       (declare (in) vec3 arg0)
+       (declare (in) vec3 arg1))
+     ((declare () vec3 t)
+      (assign (constant bool (1)) (swiz x (var_ref t))
+              (expression float - (expression float * (swiz y (var_ref arg0)) (swiz z (var_ref arg1)))
+                                 (expression float * (swiz y (var_ref arg1)) (swiz z (var_ref arg0)))))
+      (assign (constant bool (1)) (swiz y (var_ref t))
+              (expression float - (expression float * (swiz z (var_ref arg0)) (swiz x (var_ref arg1)))
+                                 (expression float * (swiz z (var_ref arg1)) (swiz x (var_ref arg0)))))
+      (assign (constant bool (1)) (swiz z (var_ref t))
+              (expression float - (expression float * (swiz x (var_ref arg0)) (swiz y (var_ref arg1)))
+                                 (expression float * (swiz x (var_ref arg1)) (swiz y (var_ref arg0)))))
+      (return (var_ref t))))
+))