cmutil_functions.c

/*
 Circuit Music Labs utilities library file.
 Copyright (C) 2014  Matthias Müller - Circuit Music Labs

 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 3 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, see <http://www.gnu.org/licenses/>.

 circuit.music.labs@gmail.com

 */

#include "ext.h"
#include <stdio.h>
#include "cmutil.h"


// RANDOM NUMBER GENERATOR (USE POINTERS FOR MORE EFFICIENCY)
double cm_random(double *min, double *max) {
#ifdef MAC_VERSION
	return *min + ((*max - *min) * (((double)arc4random_uniform(RANDMAX)) / (double)RANDMAX));
#endif
#ifdef WIN_VERSION
	return *min + ((*max - *min) * ((double)(rand() % RANDMAX) / (double)RANDMAX));
#endif
}

// LINEAR INTERPOLATION FUNCTION
double cm_lininterp(double distance, float *buffer, t_atom_long b_channelcount, short channel) {
	long index = (long)distance; // get truncated index
	distance -= (long)distance; // calculate fraction value for interpolation
	return buffer[index * b_channelcount + channel] + distance * (buffer[(index + 1) * b_channelcount + channel] - buffer[index * b_channelcount + channel]);
}

// LINEAR INTERPOLATION FUNCTION FOR WINDOW (passing douple pointer)
double cm_lininterpwin(double distance, double *buffer, t_atom_long b_channelcount, short channel) {
	long index = (long)distance; // get truncated index
	distance -= (long)distance; // calculate fraction value for interpolation
	return buffer[index * b_channelcount + channel] + distance * (buffer[(index + 1) * b_channelcount + channel] - buffer[index * b_channelcount + channel]);
}