/usr/include/crystalspace-2.0/csgeom/projections.h is in libcrystalspace-dev 2.0+dfsg-1build1.
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Copyright (C) 2008 by Frank Richter
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_CSGEOM_PROJECTIONS_H__
#define __CS_CSGEOM_PROJECTIONS_H__
/**\file
* Create standard projections
*/
/**
* \addtogroup geom_utils
* @{ */
#include "csgeom/matrix4.h"
namespace CS
{
namespace Math
{
/**
* Helpers to create standard projections
*/
struct Projections
{
/**
* Create an orthographic projection. \a left is mapped to x=-1, \a right
* to x=1, \a bottom to y=-1 and \a top to y=1. \a nearz specifies the near
* clipping distance, \a farz the far clipping distance.
* \sa \link http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml glOrtho \endlink
*/
static Matrix4 Ortho (float left, float right, float bottom, float top,
float nearz, float farz)
{
return Matrix4 (2.0f/(right-left), 0, 0, -(right+left)/(right-left),
0, 2.0f/(top-bottom), 0, -(top+bottom)/(top-bottom),
0, 0, -2.0f/(farz-nearz), -(farz+nearz)/(farz-nearz),
0, 0, 0, 1);
}
/**
* Create a perspective projection as used by CS.
*/
static Matrix4 CSPerspective (float viewWidth, float viewHeight,
float shiftX, float shiftY,
float invAspect,
float nearClip = 0.1f)
{
const float nearz = -1.0f;
float farz = 1.0f/nearClip;
Matrix4 Mortho (Ortho (0, viewWidth, 0, viewHeight, nearz, farz));
CS::Math::Matrix4 Mtranslate (
1, 0, 0, shiftX,
0, 1, 0, shiftY,
0, 0, 1, 0,
0, 0, 0, 1);
CS::Math::Matrix4 Mprojection (
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 0, -invAspect,
0, 0, invAspect, 0);
return (Mortho * Mtranslate) * Mprojection;
}
/**
* \sa \link http://www.opengl.org/sdk/docs/man/xhtml/glFrustum.xml glFrustum \endlink
*/
static Matrix4 Frustum (float left, float right, float bottom, float top,
float nearz, float farz)
{
float two_n = nearz * 2;
return Matrix4 (two_n/(right-left), 0, -(right+left)/(right-left), 0,
0, two_n/(top-bottom), -(top+bottom)/(top-bottom), 0,
0, 0, -(farz+nearz)/(farz-nearz), -(2*farz*nearz)/(farz-nearz),
0, 0, -1, 0);
}
};
} // namespace Math
} // namespace CS
/** @} */
#endif // __CS_CSGEOM_PROJECTIONS_H__
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