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00001 
00007 /* Copyright, 2000 Nevrax Ltd.
00008  *
00009  * This file is part of NEVRAX NEL.
00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
00011  * it under the terms of the GNU General Public License as published by
00012  * the Free Software Foundation; either version 2, or (at your option)
00013  * any later version.
00014 
00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00018  * General Public License for more details.
00019 
00020  * You should have received a copy of the GNU General Public License
00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00023  * MA 02111-1307, USA.
00024  */
00025 
00026 #include "std3d.h"
00027 
00028 #include "nel/3d/viewport.h"
00029 #include "nel/misc/common.h"
00030 
00031 using namespace NLMISC;
00032 
00033 
00034 namespace NL3D
00035 {
00036 
00037 CViewport::CViewport()
00038 {
00039         NL3D_MEM_VIEWPORT
00040         initFullScreen ();
00041 }
00042 
00043 
00044 void CViewport::init (float x, float y, float width, float height)
00045 {
00046         NL3D_MEM_VIEWPORT
00047         // Simply copy
00048         _X=x;
00049         clamp (_X, 0.f, 1.f);
00050         _Y=y;
00051         clamp (_Y, 0.f, 1.f);
00052         _Width=width;
00053         clamp (_Width, 0.f, 1.f-_X);
00054         _Height=height;
00055         clamp (_Height, 0.f, 1.f-_Y);
00056 }
00057 
00058 
00059 void CViewport::initFullScreen ()
00060 {
00061         NL3D_MEM_VIEWPORT
00062         // Very easy
00063         _X=0.f;
00064         _Y=0.f;
00065         _Width=1.f;
00066         _Height=1.f;
00067 }
00068 
00069 
00070 void CViewport::init16_9 ()
00071 {
00072         NL3D_MEM_VIEWPORT
00073         // Very easy
00074         _X=0.f;
00075         _Y=(1.f-0.75f)/2;
00076         _Width=1.f;
00077         _Height=0.75f;
00078 }
00079 
00080 
00081 void CViewport::getRayWithPoint (float x, float y, CVector& pos, CVector& dir, const CMatrix& camMatrix, const CFrustum& camFrust) const
00082 {
00083         NL3D_MEM_VIEWPORT
00084         float xVP=(x-_X)/_Width;
00085         float yVP=(y-_Y)/_Height;
00086 
00087         // Pos of the ray
00088         pos= camMatrix.getPos();
00089 
00090         // Get camera frustrum
00091         float left;
00092         float right;
00093         float bottom;
00094         float top;
00095         float znear;
00096         float zfar;
00097         camFrust.getValues (left, right, bottom, top, znear, zfar);
00098 
00099         // Get a local direction
00100         dir.x=left+(right-left)*xVP;
00101         dir.y=znear;
00102         dir.z=bottom+(top-bottom)*yVP;
00103 
00104         // Get a world direction
00105         CMatrix mat=camMatrix;
00106         mat.setPos (CVector (0,0,0));
00107         dir=mat*dir;
00108 }
00109 
00110 
00111 } // NL3D
00112
viewport.cpp
