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/*
Copyright (C) 2010-2012 Florian Jung
This file is part of flo's FM synth.
flo's FM synth 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.
flo's FM synth 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 flo's FM synth. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ENVELOPE_H__
#define __ENVELOPE_H__
#include <jack/jack.h>
#include "programs.h"
#include "fixed.h"
// when frames is given, this tells the envelope that get_level() is
// only called every (frames) frames. 1 means "every time", 2 means
// "every second time" and so on.
// the caller must manage to call get_level() to the appropriate times
class Envelope
{
public:
Envelope(env_settings_t s, int frames=1);
void release_key();
void reattack();
void reset();
fixed_t get_level();
bool still_active();
void set_hold(bool h);
void set_attack(jack_nframes_t a);
void set_decay(jack_nframes_t d);
void set_sustain(fixed_t s);
void set_release(jack_nframes_t r);
void set_max(fixed_t m)
{
max=m;
if (max>ONE) max=ONE;
else if (max<0) max=0;
}
void set_ratefactor(double factor);
bool get_hold() { return hold; }
jack_nframes_t get_attack() { return attack_orig; }
jack_nframes_t get_decay() { return decay_orig; }
fixed_t get_sustain() { return sustain_orig; }
jack_nframes_t get_release() { return release_orig; }
private:
fixed_t max;
jack_nframes_t attack;
jack_nframes_t decay;
jack_nframes_t release;
jack_nframes_t attack_orig;
jack_nframes_t decay_orig;
jack_nframes_t release_orig;
jack_nframes_t rel_t;
fixed_t sustain;
fixed_t sustain_orig;
fixed_t level;
bool hold;
bool has_release_phase;
jack_nframes_t t;
fixed_t ratefactor;
int nth_frame;
enum
{
ATTACK,
DECAY,
HOLD,
RELEASE,
DONE
} state;
};
#endif
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