csgeom/projections.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 2008 by Frank Richter 00003 00004 This library is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This library is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public 00015 License along with this library; if not, write to the Free 00016 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 */ 00018 00019 #ifndef __CS_CSGEOM_PROJECTIONS_H__ 00020 #define __CS_CSGEOM_PROJECTIONS_H__ 00021 00029 #include "csgeom/matrix4.h" 00030 00031 namespace CS 00032 { 00033 namespace Math 00034 { 00038 struct Projections 00039 { 00046 static Matrix4 Ortho (float left, float right, float bottom, float top, 00047 float nearz, float farz) 00048 { 00049 return Matrix4 (2.0f/(right-left), 0, 0, -(right+left)/(right-left), 00050 0, 2.0f/(top-bottom), 0, -(top+bottom)/(top-bottom), 00051 0, 0, -2.0f/(farz-nearz), -(farz+nearz)/(farz-nearz), 00052 0, 0, 0, 1); 00053 } 00054 00058 static Matrix4 CSPerspective (float viewWidth, float viewHeight, 00059 float shiftX, float shiftY, 00060 float invAspect, 00061 float nearClip = 0.1f) 00062 { 00063 const float nearz = -1.0f; 00064 float farz = 1.0f/nearClip; 00065 Matrix4 Mortho (Ortho (0, viewWidth, 0, viewHeight, nearz, farz)); 00066 00067 CS::Math::Matrix4 Mtranslate ( 00068 1, 0, 0, shiftX, 00069 0, 1, 0, shiftY, 00070 0, 0, 1, 0, 00071 0, 0, 0, 1); 00072 00073 CS::Math::Matrix4 Mprojection ( 00074 1, 0, 0, 0, 00075 0, 1, 0, 0, 00076 0, 0, 0, -invAspect, 00077 0, 0, invAspect, 0); 00078 00079 return (Mortho * Mtranslate) * Mprojection; 00080 } 00081 00085 static Matrix4 Frustum (float left, float right, float bottom, float top, 00086 float nearz, float farz) 00087 { 00088 float two_n = nearz * 2; 00089 return Matrix4 (two_n/(right-left), 0, -(right+left)/(right-left), 0, 00090 0, two_n/(top-bottom), -(top+bottom)/(top-bottom), 0, 00091 0, 0, -(farz+nearz)/(farz-nearz), -(2*farz*nearz)/(farz-nearz), 00092 0, 0, -1, 0); 00093 } 00094 }; 00095 00096 } // namespace Math 00097 } // namespace CS 00098 00101 #endif // __CS_CSGEOM_PROJECTIONS_H__ 00102
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