From 90ab0b70bfff65c22727cdf00f9070dbe7833b7d Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Fri, 29 Aug 2014 13:57:36 -0400
Subject: [PATCH] Polyfill for Math.sign(). Chrome 38 will come with it and
 Firefox already implemented it.

---
 examples/js/Mirror.js                    |  6 ++----
 src/Three.js                             | 13 +++++++++++++
 src/extras/geometries/ExtrudeGeometry.js |  3 +--
 src/math/Math.js                         |  6 ------
 4 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/examples/js/Mirror.js b/examples/js/Mirror.js
index 63ebb18ba4..fbe893485c 100644
--- a/examples/js/Mirror.js
+++ b/examples/js/Mirror.js
@@ -171,8 +171,6 @@ THREE.Mirror.prototype.renderWithMirror = function ( otherMirror ) {
 
 THREE.Mirror.prototype.updateTextureMatrix = function () {
 
-	var sign = THREE.Math.sign;
-
 	this.updateMatrixWorld();
 	this.camera.updateMatrixWorld();
 
@@ -228,8 +226,8 @@ THREE.Mirror.prototype.updateTextureMatrix = function () {
 	var q = new THREE.Vector4();
 	var projectionMatrix = this.mirrorCamera.projectionMatrix;
 
-	q.x = ( sign(this.clipPlane.x) + projectionMatrix.elements[8] ) / projectionMatrix.elements[0];
-	q.y = ( sign(this.clipPlane.y) + projectionMatrix.elements[9] ) / projectionMatrix.elements[5];
+	q.x = ( Math.sign(this.clipPlane.x) + projectionMatrix.elements[8] ) / projectionMatrix.elements[0];
+	q.y = ( Math.sign(this.clipPlane.y) + projectionMatrix.elements[9] ) / projectionMatrix.elements[5];
 	q.z = - 1.0;
 	q.w = ( 1.0 + projectionMatrix.elements[10] ) / projectionMatrix.elements[14];
 
diff --git a/src/Three.js b/src/Three.js
index 841e4ca545..ae33897343 100644
--- a/src/Three.js
+++ b/src/Three.js
@@ -5,12 +5,25 @@
 var THREE = { REVISION: '69dev' };
 
 // browserify support
+
 if ( typeof module === 'object' ) {
 
 	module.exports = THREE;
 
 }
 
+// polyfills
+
+if ( Math.sign === undefined ) {
+
+	Math.sign = function ( x ) {
+
+		return ( x < 0 ) ? - 1 : ( x > 0 ) ? 1 : 0;
+
+	};
+	
+}
+
 // GL STATE CONSTANTS
 
 THREE.CullFaceNone = 0;
diff --git a/src/extras/geometries/ExtrudeGeometry.js b/src/extras/geometries/ExtrudeGeometry.js
index d36ce187cb..bb0419574d 100644
--- a/src/extras/geometries/ExtrudeGeometry.js
+++ b/src/extras/geometries/ExtrudeGeometry.js
@@ -193,7 +193,6 @@ THREE.ExtrudeGeometry.prototype.addShape = function ( shape, options ) {
 	function getBevelVec( inPt, inPrev, inNext ) {
 
 		var EPSILON = 0.0000000001;
-		var sign = THREE.Math.sign;
 		
 		// computes for inPt the corresponding point inPt' on a new contour
 		//   shiftet by 1 unit (length of normalized vector) to the left
@@ -259,7 +258,7 @@ THREE.ExtrudeGeometry.prototype.addShape = function ( shape, options ) {
 				if ( v_prev_x < - EPSILON ) {
 					if ( v_next_x < - EPSILON ) { direction_eq = true; }
 				} else {
-					if ( sign(v_prev_y) == sign(v_next_y) ) { direction_eq = true; }
+					if ( Math.sign(v_prev_y) == Math.sign(v_next_y) ) { direction_eq = true; }
 				}
 			}
 
diff --git a/src/math/Math.js b/src/math/Math.js
index fbbaf63311..ef7af15371 100644
--- a/src/math/Math.js
+++ b/src/math/Math.js
@@ -122,12 +122,6 @@ THREE.Math = {
 
 	},
 
-	sign: function ( x ) {
-
-		return ( x < 0 ) ? - 1 : ( x > 0 ) ? 1 : 0;
-
-	},
-
 	degToRad: function () {
 
 		var degreeToRadiansFactor = Math.PI / 180;
-- 
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