2 Copyright (C) 2000-2007 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
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 General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 /* Can be overrriden with any code that produces whitenoise between 0.0f and
24 * 1.0f, eg (random() / (float)RAND_MAX) should be a good source of noise, but
27 #define GDITHER_NOISE gdither_noise()
30 inline static float gdither_noise()
32 static uint32_t rnd
= 23232323;
33 rnd
= (rnd
* 196314165) + 907633515;
35 return rnd
* 2.3283064365387e-10f
;