39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/*
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Copyright (C) 2000-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef NOISE_H
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#define NOISE_H
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/* Can be overrriden with any code that produces whitenoise between 0.0f and
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* 1.0f, eg (random() / (float)RAND_MAX) should be a good source of noise, but
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* its expensive */
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#ifndef GDITHER_NOISE
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#define GDITHER_NOISE gdither_noise()
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#endif
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inline static float gdither_noise()
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{
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static uint32_t rnd = 23232323;
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rnd = (rnd * 196314165) + 907633515;
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return rnd * 2.3283064365387e-10f;
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}
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#endif
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