/*
    Copyright (C) 2012-2013 Carl Hetherington <cth@carlh.net>

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <cmath>
#include "gamma_lut.h"
#include "lut_cache.h"

using namespace libdcp;

LUTCache<GammaLUT> GammaLUT::cache;

GammaLUT::GammaLUT(int bits, float gamma)
	: LUT (bits, gamma)
{
	int const bit_length = pow(2, bits);
	for (int i = 0; i < bit_length; ++i) {
		_lut[i] = pow(float(i) / (bit_length - 1), gamma);
	}
}