diff options
author | Tom Schouten <doelie@users.sourceforge.net> | 2003-01-21 10:18:19 +0000 |
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committer | Tom Schouten <doelie@users.sourceforge.net> | 2003-01-21 10:18:19 +0000 |
commit | cdf8ded57019d5c905f16422d40be7b1a18ab3bc (patch) | |
tree | 92623f40f305b1e2f51198d5c16893c7ca70a2c6 /system/envelope_util.c |
This commit was generated by cvs2svn to compensate for changes in r350,svn2git-root
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/externals/creb/; revision=351
Diffstat (limited to 'system/envelope_util.c')
-rw-r--r-- | system/envelope_util.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/system/envelope_util.c b/system/envelope_util.c new file mode 100644 index 0000000..7117149 --- /dev/null +++ b/system/envelope_util.c @@ -0,0 +1,33 @@ +/* + * Utility functions for exponential decay + * Copyright (c) 2000-2003 by Tom Schouten + * + * 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 "extlib_util.h" + +float milliseconds_2_one_minus_realpole(float time) +{ + float r; + + if (time < 0.0f) time = 0.0f; + r = -expm1(1000.0f * log(ENVELOPE_RANGE) / (sys_getsr() * time)); + if (!(r < 1.0f)) r = 1.0f; + + //post("%f",r); + return r; +} |