MATH: convert LGPL code to GPL

COPYING.LGPL

@@ -1,6 +1,4 @@
 NOTE: Only certain parts of the ResidualVM project are under the GNU LGPL.
-ResidualVM use some math code of plib and Portalib3d software. Look into
-source code files "math/quat.cpp" and "math/matrix4.cpp" for more info.
 The majority of the files are under the GNU GPL. See the headers of the
 individual files to find out the exact license.
 

math/matrix4.cpp

@@ -20,6 +20,19 @@
  *
  */
 
+/*
+ * The following functions: inverseTranslate, inverseRotate, transpose
+ * are adapted from Portalib3d, which is no longer available on the net.
+ * But is available through archive.org, for reference:
+ * http://web.archive.org/web/20050205215104/http://rsn.gamedev.net/pl3d/changelog.html
+ *
+ * This code was originally made available under the LGPL license (no version specified).
+ * Copyright (C)2000, 2001, Brett Porter. All Rights Reserved.
+ *
+ * This code (and our modifications) is made available here under the GPLv2 (or later).
+ *
+ */
+
 #include "math/matrix4.h"
 #include "math/vector4d.h"
 #include "math/squarematrix.h"
@@ -118,17 +131,6 @@ void Matrix<4, 4>::invertAffineOrthonormal() {
     setPosition(position);
 }
 
-// The following functions are adapted from Portalib3d, which no longer is 
-// available on the net, but was used in the iconoclast-project:
-// http://code.google.com/p/iconoclast/
-// Original copyright notice (license.txt was not supplied in iconoclast)
-// http://web.archive.org/web/20050209062435/http://rsn.gamedev.net/pl3d/license.txt
-// Author:	Brett Porter
-// Email: brettporter@yahoo.com
-// Website: http://rsn.gamedev.net/pl3d
-// Copyright (C)2000, 2001, Brett Porter. All Rights Reserved.
-// This source code is released under the LGPL. See license.txt for details.
-
 void Matrix<4, 4>::inverseTranslate(Vector3d *v) const {
 	v->x() = v->x() - getValue(0, 3);
 	v->y() = v->y() - getValue(1, 3);

math/quat.cpp

@@ -20,17 +20,21 @@
  *
  */
 
-// Quaternion-math originally borrowed from plib http://plib.sourceforge.net/index.html
-// Which is covered by LGPL2
-// And has this additional copyright note:
 /*
- Quaternion routines are Copyright (C) 1999
+ * Quaternion-math originally borrowed from plib http://plib.sourceforge.net/index.html
- Kevin B. Thompson <kevinbthompson@yahoo.com>
+ * This code was originally made available under the LGPLv2 license (or later).
- Modified by Sylvan W. Clebsch <sylvan@stanford.edu>
+ *
- Largely rewritten by "Negative0" <negative0@earthlink.net>
+ * Quaternion routines are Copyright (C) 1999
+ * Kevin B. Thompson <kevinbthompson@yahoo.com>
+ * Modified by Sylvan W. Clebsch <sylvan@stanford.edu>
+ * Largely rewritten by "Negative0" <negative0@earthlink.net>
+ *
+ * This code (and our modifications) is made available here under the GPLv2 (or later).
+ *
+ * Additional changes written based on the math presented in
+ * http://www.swarthmore.edu/NatSci/mzucker1/e27/diebel2006attitude.pdf
+ *
  */
-// Additional changes written based on the math presented in
-// http://www.swarthmore.edu/NatSci/mzucker1/e27/diebel2006attitude.pdf
 
 #include "common/streamdebug.h"