khanat-opennel-code/code/nel/src/3d/viewport.cpp
2010-05-06 02:08:41 +02:00

98 lines
2.1 KiB
C++

// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "std3d.h"
#include "nel/3d/viewport.h"
#include "nel/misc/common.h"
using namespace NLMISC;
namespace NL3D
{
CViewport::CViewport()
{
initFullScreen ();
}
void CViewport::init (float x, float y, float width, float height)
{
// Simply copy
_X=x;
clamp (_X, 0.f, 1.f);
_Y=y;
clamp (_Y, 0.f, 1.f);
_Width=width;
clamp (_Width, 0.f, 1.f-_X);
_Height=height;
clamp (_Height, 0.f, 1.f-_Y);
}
void CViewport::initFullScreen ()
{
// Very easy
_X=0.f;
_Y=0.f;
_Width=1.f;
_Height=1.f;
}
void CViewport::init16_9 ()
{
// Very easy
_X=0.f;
_Y=(1.f-0.75f)/2;
_Width=1.f;
_Height=0.75f;
}
void CViewport::getRayWithPoint (float x, float y, CVector& pos, CVector& dir, const CMatrix& camMatrix, const CFrustum& camFrust) const
{
float xVP=(x-_X)/_Width;
float yVP=(y-_Y)/_Height;
// Pos of the ray
pos= camMatrix.getPos();
// Get camera frustrum
float left;
float right;
float bottom;
float top;
float znear;
float zfar;
camFrust.getValues (left, right, bottom, top, znear, zfar);
// Get a local direction
dir.x=left+(right-left)*xVP;
dir.y=znear;
dir.z=bottom+(top-bottom)*yVP;
// Get a world direction
CMatrix mat=camMatrix;
mat.setPos (CVector (0,0,0));
dir=mat*dir;
}
} // NL3D