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livetrax/libs/surfaces/mackie/pot.cc

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/*
* Copyright (C) 2006-2007 John Anderson
* Copyright (C) 2012-2015 Paul Davis <paul@linuxaudiosystems.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <cmath>
#include "pot.h"
#include "surface.h"
#include "control_group.h"
using namespace ArdourSurface;
using namespace Mackie;
int const Pot::External = 0x2e; /* specific ID for "vpot" representing external control */
int const Pot::ID = 0x10; /* base value for v-pot IDs */
Control*
Pot::factory (Surface& surface, int id, const char* name, Group& group)
{
Pot* p = new Pot (id, name, group);
surface.pots[id] = p;
p->is_qcon = surface.get_qcon_flag();
surface.controls.push_back (p);
group.add (*p);
return p;
}
MidiByteArray
Pot::set (float val, bool onoff, Mode mode)
{
// TODO do an exact calc for 0.50? To allow manually re-centering the port.
MIDI::byte msg;
// center on if val is "very close" to 0.50
if( !is_qcon ) {
// center the position and shift bits for standard mackie surface
msg = (val > 0.48 && val < 0.58 ? 1 : 0) << 6;
} else { //center the position and don't shift anything for qcon - TODO: on center position lit the center LED on the ring
if(val > 0.48 && val < 0.58) {
val = 0.50;
}
// set msg
msg = val;
}
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// Pot/LED mode
if( !is_qcon ) {
// Mackie mode - Supports all ring modes
msg |= (mode << 4);
} else {
// Qcon rotary mode - Only "DOT" mode? - TODO: Investigate how to proper set vpot rings to different modes on qcon
msg |= (0 << 4);
}
/*
* Even though a width value may be negative, there is
* technically still width there, it is just reversed,
* so make sure to show it on the LED ring appropriately.
*/
if (val < 0){
val = val * -1;
}
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// val, but only if off hasn't explicitly been set
if (onoff) {
if (mode == spread) {
msg |= (lrintf (val * 6)) & 0x0f; // 0b00001111
} else {
msg |= (lrintf (val * 10.0) + 1) & 0x0f; // 0b00001111
}
}
/* outbound LED message requires 0x20 to be added to the LED's id
*/
return MidiByteArray (3, 0xb0, 0x20 + id(), msg);
}
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