LCOV - code coverage report
Current view: directory - objdir/dist/include - gfxQuaternion.h (source / functions) Found Hit Coverage
Test: app.info Lines: 37 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Corporation code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Matt Woodrow <mwoodrow@mozilla.com>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #ifndef GFX_QUATERNION_H
      39                 : #define GFX_QUATERNION_H
      40                 : 
      41                 : #include "mozilla/gfx/BasePoint4D.h"
      42                 : #include "gfx3DMatrix.h"
      43                 : #include "nsAlgorithm.h"
      44                 : 
      45                 : struct THEBES_API gfxQuaternion : public mozilla::gfx::BasePoint4D<gfxFloat, gfxQuaternion> {
      46                 :     typedef mozilla::gfx::BasePoint4D<gfxFloat, gfxQuaternion> Super;
      47                 : 
      48               0 :     gfxQuaternion() : Super() {}
      49               0 :     gfxQuaternion(gfxFloat aX, gfxFloat aY, gfxFloat aZ, gfxFloat aW) : Super(aX, aY, aZ, aW) {}
      50                 : 
      51               0 :     gfxQuaternion(const gfx3DMatrix& aMatrix) {
      52               0 :         w = 0.5 * sqrt(NS_MAX(1 + aMatrix[0][0] + aMatrix[1][1] + aMatrix[2][2], 0.0f));
      53               0 :         x = 0.5 * sqrt(NS_MAX(1 + aMatrix[0][0] - aMatrix[1][1] - aMatrix[2][2], 0.0f));
      54               0 :         y = 0.5 * sqrt(NS_MAX(1 - aMatrix[0][0] + aMatrix[1][1] - aMatrix[2][2], 0.0f));
      55               0 :         z = 0.5 * sqrt(NS_MAX(1 - aMatrix[0][0] - aMatrix[1][1] + aMatrix[2][2], 0.0f));
      56                 : 
      57               0 :         if(aMatrix[2][1] > aMatrix[1][2])
      58               0 :             x = -x;
      59               0 :         if(aMatrix[0][2] > aMatrix[2][0])
      60               0 :             y = -y;
      61               0 :         if(aMatrix[1][0] > aMatrix[0][1])
      62               0 :             z = -z;
      63               0 :     }
      64                 : 
      65               0 :     gfxQuaternion Slerp(const gfxQuaternion &aOther, gfxFloat aCoeff) {
      66               0 :         gfxFloat dot = mozilla::clamped(DotProduct(aOther), -1.0, 1.0);
      67               0 :         if (dot == 1.0) {
      68               0 :             return *this;
      69                 :         }
      70                 : 
      71               0 :         gfxFloat theta = acos(dot);
      72               0 :         gfxFloat rsintheta = 1/sqrt(1 - dot*dot);
      73               0 :         gfxFloat w = sin(aCoeff*theta)*rsintheta;
      74                 : 
      75               0 :         gfxQuaternion left = *this;
      76               0 :         gfxQuaternion right = aOther;
      77                 : 
      78               0 :         left *= cos(aCoeff*theta) - dot*w;
      79               0 :         right *= w;
      80                 : 
      81               0 :         return left + right;
      82                 :     }
      83                 : 
      84               0 :     gfx3DMatrix ToMatrix() {
      85               0 :         gfx3DMatrix temp;
      86                 : 
      87               0 :         temp[0][0] = 1 - 2 * (y * y + z * z);
      88               0 :         temp[0][1] = 2 * (x * y + w * z);
      89               0 :         temp[0][2] = 2 * (x * z - w * y);
      90               0 :         temp[1][0] = 2 * (x * y - w * z);
      91               0 :         temp[1][1] = 1 - 2 * (x * x + z * z);
      92               0 :         temp[1][2] = 2 * (y * z + w * x);
      93               0 :         temp[2][0] = 2 * (x * z + w * y);
      94               0 :         temp[2][1] = 2 * (y * z - w * x);
      95               0 :         temp[2][2] = 1 - 2 * (x * x + y * y);
      96                 : 
      97                 :         return temp;
      98                 :     }
      99                 : 
     100                 : };
     101                 : 
     102                 : #endif /* GFX_QUATERNION_H */

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