[cc-frame-viewer] Add gl-matrix to third_party [redux]

tools/cc-frame-viewer/third_party/gl-matrix/src/gl-matrix/mat2d.js

+/* Copyright (c) 2013, Brandon Jones, Colin MacKenzie IV. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice, this
+    list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation 
+    and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+/**
+ * @class 2x3 Matrix
+ * @name mat2d
+ * 
+ * @description 
+ * A mat2d contains six elements defined as:
+ * <pre>
+ * [a, b,
+ *  c, d,
+ *  tx,ty]
+ * </pre>
+ * This is a short form for the 3x3 matrix:
+ * <pre>
+ * [a, b, 0
+ *  c, d, 0
+ *  tx,ty,1]
+ * </pre>
+ * The last column is ignored so the array is shorter and operations are faster.
+ */
+var mat2d = {};
+
+/**
+ * Creates a new identity mat2d
+ *
+ * @returns {mat2d} a new 2x3 matrix
+ */
+mat2d.create = function() {
+    var out = new GLMAT_ARRAY_TYPE(6);
+    out[0] = 1;
+    out[1] = 0;
+    out[2] = 0;
+    out[3] = 1;
+    out[4] = 0;
+    out[5] = 0;
+    return out;
+};
+
+/**
+ * Creates a new mat2d initialized with values from an existing matrix
+ *
+ * @param {mat2d} a matrix to clone
+ * @returns {mat2d} a new 2x3 matrix
+ */
+mat2d.clone = function(a) {
+    var out = new GLMAT_ARRAY_TYPE(6);
+    out[0] = a[0];
+    out[1] = a[1];
+    out[2] = a[2];
+    out[3] = a[3];
+    out[4] = a[4];
+    out[5] = a[5];
+    return out;
+};
+
+/**
+ * Copy the values from one mat2d to another
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the source matrix
+ * @returns {mat2d} out
+ */
+mat2d.copy = function(out, a) {
+    out[0] = a[0];
+    out[1] = a[1];
+    out[2] = a[2];
+    out[3] = a[3];
+    out[4] = a[4];
+    out[5] = a[5];
+    return out;
+};
+
+/**
+ * Set a mat2d to the identity matrix
+ *
+ * @param {mat2d} out the receiving matrix
+ * @returns {mat2d} out
+ */
+mat2d.identity = function(out) {
+    out[0] = 1;
+    out[1] = 0;
+    out[2] = 0;
+    out[3] = 1;
+    out[4] = 0;
+    out[5] = 0;
+    return out;
+};
+
+/**
+ * Inverts a mat2d
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the source matrix
+ * @returns {mat2d} out
+ */
+mat2d.invert = function(out, a) {
+    var aa = a[0], ab = a[1], ac = a[2], ad = a[3],
+        atx = a[4], aty = a[5];
+
+    var det = aa * ad - ab * ac;
+    if(!det){
+        return null;
+    }
+    det = 1.0 / det;
+
+    out[0] = ad * det;
+    out[1] = -ab * det;
+    out[2] = -ac * det;
+    out[3] = aa * det;
+    out[4] = (ac * aty - ad * atx) * det;
+    out[5] = (ab * atx - aa * aty) * det;
+    return out;
+};
+
+/**
+ * Calculates the determinant of a mat2d
+ *
+ * @param {mat2d} a the source matrix
+ * @returns {Number} determinant of a
+ */
+mat2d.determinant = function (a) {
+    return a[0] * a[3] - a[1] * a[2];
+};
+
+/**
+ * Multiplies two mat2d's
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the first operand
+ * @param {mat2d} b the second operand
+ * @returns {mat2d} out
+ */
+mat2d.multiply = function (out, a, b) {
+    var aa = a[0], ab = a[1], ac = a[2], ad = a[3],
+        atx = a[4], aty = a[5],
+        ba = b[0], bb = b[1], bc = b[2], bd = b[3],
+        btx = b[4], bty = b[5];
+
+    out[0] = aa*ba + ab*bc;
+    out[1] = aa*bb + ab*bd;
+    out[2] = ac*ba + ad*bc;
+    out[3] = ac*bb + ad*bd;
+    out[4] = ba*atx + bc*aty + btx;
+    out[5] = bb*atx + bd*aty + bty;
+    return out;
+};
+
+/**
+ * Alias for {@link mat2d.multiply}
+ * @function
+ */
+mat2d.mul = mat2d.multiply;
+
+
+/**
+ * Rotates a mat2d by the given angle
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the matrix to rotate
+ * @param {Number} rad the angle to rotate the matrix by
+ * @returns {mat2d} out
+ */
+mat2d.rotate = function (out, a, rad) {
+    var aa = a[0],
+        ab = a[1],
+        ac = a[2],
+        ad = a[3],
+        atx = a[4],
+        aty = a[5],
+        st = Math.sin(rad),
+        ct = Math.cos(rad);
+
+    out[0] = aa*ct + ab*st;
+    out[1] = -aa*st + ab*ct;
+    out[2] = ac*ct + ad*st;
+    out[3] = -ac*st + ct*ad;
+    out[4] = ct*atx + st*aty;
+    out[5] = ct*aty - st*atx;
+    return out;
+};
+
+/**
+ * Scales the mat2d by the dimensions in the given vec2
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the matrix to translate
+ * @param {mat2d} v the vec2 to scale the matrix by
+ * @returns {mat2d} out
+ **/
+mat2d.scale = function(out, a, v) {
+    var vx = v[0], vy = v[1];
+    out[0] = a[0] * vx;
+    out[1] = a[1] * vy;
+    out[2] = a[2] * vx;
+    out[3] = a[3] * vy;
+    out[4] = a[4] * vx;
+    out[5] = a[5] * vy;
+    return out;
+};
+
+/**
+ * Translates the mat2d by the dimensions in the given vec2
+ *
+ * @param {mat2d} out the receiving matrix
+ * @param {mat2d} a the matrix to translate
+ * @param {mat2d} v the vec2 to translate the matrix by
+ * @returns {mat2d} out
+ **/
+mat2d.translate = function(out, a, v) {
+    out[0] = a[0];
+    out[1] = a[1];
+    out[2] = a[2];
+    out[3] = a[3];
+    out[4] = a[4] + v[0];
+    out[5] = a[5] + v[1];
+    return out;
+};
+
+/**
+ * Returns a string representation of a mat2d
+ *
+ * @param {mat2d} a matrix to represent as a string
+ * @returns {String} string representation of the matrix
+ */
+mat2d.str = function (a) {
+    return 'mat2d(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + 
+                    a[3] + ', ' + a[4] + ', ' + a[5] + ')';
+};
+
+if(typeof(exports) !== 'undefined') {
+    exports.mat2d = mat2d;
+}