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/*
* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
*
* 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, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _ardour_surfaces_m2pad_h_
#define _ardour_surfaces_m2pad_h_
#include <stdint.h>
#include "pbd/signals.h"
namespace ArdourSurface {
class M2PadInterface
{
public:
M2PadInterface () {}
virtual ~M2PadInterface () {}
/* user API */
PBD::Signal1<void, float> pressed;
PBD::Signal0<void> released;
PBD::Signal1<void, float> aftertouch;
PBD::Signal2<void, float, bool> event;
PBD::Signal1<void, float> changed;
virtual uint16_t value () const { return 0; }
virtual float pressure () const { return 0.f; }
virtual void set_color (uint32_t rgba) {}
/* internal API - called from device thread */
virtual void set_value (uint16_t v) {}
virtual void color (uint8_t& r, uint8_t& g, uint8_t& b) const {
r = g = b = 0;
}
};
class M2Pad : public M2PadInterface
{
public:
M2Pad ()
: M2PadInterface ()
, _pressed (false)
, _pressure (0)
, _last (0)
, _cnt (0)
, _rgba (0)
{
for (int i = 0; i < 4; ++i) {
hist[i] = 0;
}
}
uint16_t value () const { return _raw; }
float pressure () const { return _pressure; }
void set_color (uint32_t rgba) { _rgba = rgba; }
void color (uint8_t& r, uint8_t& g, uint8_t& b) const
{
r = ((_rgba >> 24) & 0xff) >> 1;
g = ((_rgba >> 16) & 0xff) >> 1;
b = ((_rgba >> 8) & 0xff) >> 1;
}
void set_value (uint16_t v)
{
// bleed to neighboring pads...
static const uint16_t high = 159;
static const float low = 159 / 4095.f;
static const float mindelta = 32.f / 4096.f;
if (_raw != v) {
changed (v / 4095.f);
_raw = v;
}
// some pads never return to "0", and there's
// TODO map pressure from a min..max range,
// even hard hits rarely exceed 3400 or thereabouts.
// -> "pad sensitivity" config or "calibrate pads"
hist[_cnt] = v;
_cnt = (_cnt + 1) & 3;
if (_pressed) {
const float p = v / 4095.f;
_pressure += .1 * (p - _pressure);
if (_pressure < low) {
_pressure = 0;
_pressed = false;
released (); /* EMIT SIGNAL */
event (_pressure, true); /* EMIT SIGNAL */
} else {
if (fabsf (_last - _pressure) > mindelta) {
_last = _pressure;
aftertouch (_pressure); /* EMIT SIGNAL */
event (_pressure, false); /* EMIT SIGNAL */
}
}
} else {
bool above_thresh = true;
uint16_t max = 0;
for (int i = 0; i < 4; ++i) {
if (hist[i] < high) {
above_thresh = false;
break;
}
max = std::max (max, hist[i]);
}
if (above_thresh) {
_pressed = true;
_last = _pressure = max / 4095.f;
pressed (_pressure);
event (_pressure, true); /* EMIT SIGNAL */
}
}
}
protected:
bool _pressed;
float _pressure;
uint16_t _raw;
float _last;
uint16_t hist[4];
unsigned int _cnt;
uint32_t _rgba;
};
} /* namespace */
#endif /* _ardour_surfaces_m2pad_h_ */
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