nel/src/3d/viewport.cpp

   1 // NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
   2 // Copyright (C) 2010  Winch Gate Property Limited
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU Affero General Public License as
   6 // published by the Free Software Foundation, either version 3 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU Affero General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU Affero General Public License
  15 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "std3d.h"
  18
  19 #include "nel/3d/viewport.h"
  20 #include "nel/misc/common.h"
  21
  22 using namespace NLMISC;
  23
  24 #ifdef DEBUG_NEW
  25 #define new DEBUG_NEW
  26 #endif
  27
  28 namespace NL3D
  29 {
  30
  31 CViewport::CViewport()
  32 {
  33         initFullScreen ();
  34 }
  35
  36
  37 void CViewport::init (float x, float y, float width, float height)
  38 {
  39         // Simply copy
  40         _X=x;
  41         clamp (_X, 0.f, 1.f);
  42         _Y=y;
  43         clamp (_Y, 0.f, 1.f);
  44         _Width=width;
  45         clamp (_Width, 0.f, 1.f-_X);
  46         _Height=height;
  47         clamp (_Height, 0.f, 1.f-_Y);
  48 }
  49
  50
  51 void CViewport::initFullScreen ()
  52 {
  53         // Very easy
  54         _X=0.f;
  55         _Y=0.f;
  56         _Width=1.f;
  57         _Height=1.f;
  58 }
  59
  60
  61 void CViewport::init16_9 ()
  62 {
  63         // Very easy
  64         _X=0.f;
  65         _Y=(1.f-0.75f)/2;
  66         _Width=1.f;
  67         _Height=0.75f;
  68 }
  69
  70
  71 void CViewport::getRayWithPoint (float x, float y, CVector& pos, CVector& dir, const CMatrix& camMatrix, const CFrustum& camFrust) const
  72 {
  73         float xVP=(x-_X)/_Width;
  74         float yVP=(y-_Y)/_Height;
  75
  76         // Pos of the ray
  77         pos= camMatrix.getPos();
  78
  79         // Get camera frustrum
  80         float left;
  81         float right;
  82         float bottom;
  83         float top;
  84         float znear;
  85         float zfar;
  86         camFrust.getValues (left, right, bottom, top, znear, zfar);
  87
  88         // Get a local direction
  89         dir.x=left+(right-left)*xVP;
  90         dir.y=znear;
  91         dir.z=bottom+(top-bottom)*yVP;
  92
  93         // Get a world direction
  94         CMatrix mat=camMatrix;
  95         mat.setPos (CVector (0,0,0));
  96         dir=mat*dir;
  97 }
  98
  99
 100 } // NL3D
 101