From: Kenneth Graunke <kenneth@whitecape.org>
Date: Wed, 17 Nov 2010 21:20:30 +0000 (-0800)
Subject: glsl: Reimplement the "cross" built-in without ir_binop_cross.
X-Git-Tag: 062012170305~8859
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=671ccf593e1079d0f3e1adf42831d09da91a2b68;p=profile%2Fivi%2Fmesa.git

glsl: Reimplement the "cross" built-in without ir_binop_cross.

We are not aware of any GPU that actually implements the cross product
as a single instruction.  Hence, there's no need for it to be an opcode.
Future commits will remove it entirely.
---

diff --git a/src/glsl/builtins/ir/cross b/src/glsl/builtins/ir/cross
index 24717a2..02991fe 100644
--- a/src/glsl/builtins/ir/cross
+++ b/src/glsl/builtins/ir/cross
@@ -1,7 +1,9 @@
 ((function cross
    (signature vec3
      (parameters
-       (declare (in) vec3 arg0)
-       (declare (in) vec3 arg1))
-     ((return (expression vec3 cross (var_ref arg0) (var_ref arg1)))))
+       (declare (in) vec3 a)
+       (declare (in) vec3 b))
+     ((return (expression vec3 -
+        (expression vec3 * (swiz yzx (var_ref a)) (swiz zxy (var_ref b)))
+        (expression vec3 * (swiz zxy (var_ref a)) (swiz yzx (var_ref b)))))))
 ))