//
//  Filename         : GridHelpers.cpp
//  Author(s)        : Alexander Beels
//  Purpose          : Class to define a cell grid surrounding
//                     the projected image of a scene
//  Date of creation : 2010-12-21
//
///////////////////////////////////////////////////////////////////////////////

//
//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
//   with this source distribution. 
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  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 General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////

#include <math.h>
#include "GridHelpers.h"

void GridHelpers::getDefaultViewProscenium(real viewProscenium[4]) {
	// Get proscenium boundary for culling
	// bufferZone determines the amount by which the area processed
	// should exceed the actual image area.  This is intended to
	// avoid visible artifacts generated along the proscenium edge.
	// Perhaps this is no longer needed now that entire view edges
	// are culled at once, since that theoretically should eliminate
	// visible artifacts.
	// To the extent it is still useful, bufferZone should be put into 
	// the UI as configurable percentage value
	const real bufferZone = 0.05;
	// borderZone describes a blank border outside the proscenium, but
	// still inside the image area.  Only intended for exposing possible
	// artifacts along or outside the proscenium edge during debugging.
	const real borderZone = 0.0;
	viewProscenium[0] = freestyle_viewport[2] * (borderZone - bufferZone);
	viewProscenium[1] = freestyle_viewport[2] * (1.0f - borderZone + bufferZone);
	viewProscenium[2] = freestyle_viewport[3] * (borderZone - bufferZone);
	viewProscenium[3] = freestyle_viewport[3] * (1.0f - borderZone + bufferZone);
}

GridHelpers::Transform::~Transform () {}