// 
//---------------------------------------------------------------------------
//
// Copyright(C) 2015 Christopher Bruns
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see http://www.gnu.org/licenses/
//
//--------------------------------------------------------------------------
//
/*
** scoped_view_shifter.cpp
** Stack-scoped class for temporarily changing camera viewpoint
** Used for stereoscopic 3D.
**
*/

#include "scoped_view_shifter.h"
#include "r_utility.h"

namespace s3d {

ScopedViewShifter::ScopedViewShifter(float dxyz[3]) // in doom units
{
	// save original values
	cachedView = r_viewpoint.Pos;
	// modify values
	r_viewpoint.Pos += DVector3(dxyz[0], dxyz[1], dxyz[2]);
}

ScopedViewShifter::~ScopedViewShifter()
{
	// restore original values
	r_viewpoint.Pos = cachedView;
}

}