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/*
(c) Fraser Stuart 2009
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.
*/
#ifndef __INVADA_COMMON_H
#define __INVADA_COMMON_H
/* 2.0 * atan(1.0) */
#define PI_ON_2 1.570796327
/* PI */
#define PI 3.1415926535877932
/* 2*PI */
#define PI_2 6.2831853071795864
/* -1.0 / log10(sin(0.2 * atan(1.0))) */
#define ITUBE_MAGIC 1.241206735
/*2^31-2 */
#define TWO31_MINUS2 2147483646
/* maximun number of early reflections to calculate */
#define MAX_ER 100
/* speed of sound in air in meters/second */
#define SPEED_OF_SOUND 330
#define INVADA_METER_VU 0
#define INVADA_METER_PEAK 1
#define INVADA_METER_PHASE 2
#define INVADA_METER_LAMP 3
struct Envelope {
float attack;
float decay;
};
struct ERunit {
int Active;
float rand;
float DelayActual;
float DelayOffset;
unsigned long Delay;
unsigned int Reflections;
float AbsGain;
float GainL;
float GainR;
};
struct FilterP {
int Active;
double x[3];
double x2[3];
double y[3];
double y2[3];
double i[5];
};
/* param change detect functions, second one calculates deltas for interpolation in run loops */
void checkParamChange(unsigned long param, float * control, float * last, float * converted, double sr, float (*ConvertFunction)(unsigned long, float, double));
float getParamChange(unsigned long param, float * control, float * last, float * converted, double sr, float (*ConvertFunction)(unsigned long, float, double));
/* audio envelope */
void initIEnvelope(struct Envelope * Env, int mode, double sr);
float applyIEnvelope(struct Envelope * Env, float value, float envelope);
/* add or subtract to delay space */
void SpaceAdd(float *SpacePos, float *SpaceEnd, unsigned long SpaceSize, unsigned long Delay, float Offset, float Value);
void SpaceSub(float *SpacePos, float *SpaceEnd, unsigned long SpaceSize, unsigned long Delay, float Offset, float Value);
/* soft clipping function */
float InoClip(float in, float *drive);
/* distortion function */
float ITube_do(float in, float Drive);
/* works out a single er reflection */
void calculateSingleIReverbER(struct ERunit * er, float Width, float Length, float Height, int Phase, unsigned int reflections, float DDist, double sr);
/* works out all er reflections */
int calculateIReverbER(struct ERunit *erarray, int erMax,
float width, float length, float height,
float sourceLR, float sourceFB,
float destLR, float destFB, float objectHeight,
float diffusion,
double sr);
/* Butterworth bandpass for spectral analysier */
void initBandpassFilter(struct FilterP *f, double sr, double cf, double bw);
float applyBandpassFilter(struct FilterP *f, float in);
#endif /*__INVADA_COMMON_H */
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