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diff --git a/source/mupen64plus-video-arachnoid/src/math/Matrix4.cpp b/source/mupen64plus-video-arachnoid/src/math/Matrix4.cpp
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+++ b/source/mupen64plus-video-arachnoid/src/math/Matrix4.cpp
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+/******************************************************************************
+ * Arachnoid Graphics Plugin for Mupen64Plus
+ * http://bitbucket.org/wahrhaft/mupen64plus-video-arachnoid/
+ *
+ * Copyright (C) 2007 Kristofer Karlsson, Rickard Niklasson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *****************************************************************************/
+
+#include "Matrix4.h"
+
+const Matrix4 Matrix4::ZERO( 0, 0, 0, 0,
+                             0, 0, 0, 0,
+                             0, 0, 0, 0,
+                             0, 0, 0, 0 );
+
+const Matrix4 Matrix4::IDENTITY( 1, 0, 0, 0,
+                                 0, 1, 0, 0,
+                                 0, 0, 1, 0,
+                                 0, 0, 0, 1 );
+
+const Matrix4 Matrix4::CLIPSPACE2DTOIMAGESPACE( 0.5,  0,    0,  0.5, 
+                                                0,   -0.5,  0,  0.5, 
+                                                0,    0,    1,    0,
+                                                0,    0,    0,    1);
+
+
+//-----------------------------------------------------------------------
+//! Calclate and returns the deteminant of the matrix
+//-----------------------------------------------------------------------
+float Matrix4::determinant() const
+{
+    return (_m[0]*(_m[4]*_m[8] - _m[7]*_m[5])) - (_m[1]*(_m[3]*_m[8] - _m[6]*_m[5])) + (_m[2]*(_m[3]*_m[7] - _m[6]*_m[4]));
+}
+
+//-----------------------------------------------------------------------
+//! Inverse Matrix
+//-----------------------------------------------------------------------
+Matrix4 Matrix4::inverse() const
+{
+    float m00 = m[0][0], m01 = m[0][1], m02 = m[0][2], m03 = m[0][3];
+    float m10 = m[1][0], m11 = m[1][1], m12 = m[1][2], m13 = m[1][3];
+    float m20 = m[2][0], m21 = m[2][1], m22 = m[2][2], m23 = m[2][3];
+    float m30 = m[3][0], m31 = m[3][1], m32 = m[3][2], m33 = m[3][3];
+
+    float v0 = m20 * m31 - m21 * m30;
+    float v1 = m20 * m32 - m22 * m30;
+    float v2 = m20 * m33 - m23 * m30;
+    float v3 = m21 * m32 - m22 * m31;
+    float v4 = m21 * m33 - m23 * m31;
+    float v5 = m22 * m33 - m23 * m32;
+
+    float t00 = + (v5 * m11 - v4 * m12 + v3 * m13);
+    float t10 = - (v5 * m10 - v2 * m12 + v1 * m13);
+    float t20 = + (v4 * m10 - v2 * m11 + v0 * m13);
+    float t30 = - (v3 * m10 - v1 * m11 + v0 * m12);
+
+    float invDet = 1 / (t00 * m00 + t10 * m01 + t20 * m02 + t30 * m03);
+
+    float d00 = t00 * invDet;
+    float d10 = t10 * invDet;
+    float d20 = t20 * invDet;
+    float d30 = t30 * invDet;
+
+    float d01 = - (v5 * m01 - v4 * m02 + v3 * m03) * invDet;
+    float d11 = + (v5 * m00 - v2 * m02 + v1 * m03) * invDet;
+    float d21 = - (v4 * m00 - v2 * m01 + v0 * m03) * invDet;
+    float d31 = + (v3 * m00 - v1 * m01 + v0 * m02) * invDet;
+
+    v0 = m10 * m31 - m11 * m30;
+    v1 = m10 * m32 - m12 * m30;
+    v2 = m10 * m33 - m13 * m30;
+    v3 = m11 * m32 - m12 * m31;
+    v4 = m11 * m33 - m13 * m31;
+    v5 = m12 * m33 - m13 * m32;
+
+    float d02 = + (v5 * m01 - v4 * m02 + v3 * m03) * invDet;
+    float d12 = - (v5 * m00 - v2 * m02 + v1 * m03) * invDet;
+    float d22 = + (v4 * m00 - v2 * m01 + v0 * m03) * invDet;
+    float d32 = - (v3 * m00 - v1 * m01 + v0 * m02) * invDet;
+
+    v0 = m21 * m10 - m20 * m11;
+    v1 = m22 * m10 - m20 * m12;
+    v2 = m23 * m10 - m20 * m13;
+    v3 = m22 * m11 - m21 * m12;
+    v4 = m23 * m11 - m21 * m13;
+    v5 = m23 * m12 - m22 * m13;
+
+    float d03 = - (v5 * m01 - v4 * m02 + v3 * m03) * invDet;
+    float d13 = + (v5 * m00 - v2 * m02 + v1 * m03) * invDet;
+    float d23 = - (v4 * m00 - v2 * m01 + v0 * m03) * invDet;
+    float d33 = + (v3 * m00 - v1 * m01 + v0 * m02) * invDet;
+
+    return Matrix4(
+        d00, d01, d02, d03,
+        d10, d11, d12, d13,
+        d20, d21, d22, d23,
+        d30, d31, d32, d33);
+}