69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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* Copyright (C) 2017 Ben Loftis <ben@harrisonconsoles.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <cmath>
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#include "pbd/compose.h"
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#include "ardour/debug.h"
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#include "fader.h"
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#include "surface.h"
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#include "control_group.h"
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#include "us2400_control_protocol.h"
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using namespace ArdourSurface;
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using namespace US2400;
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using namespace PBD;
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Control*
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Fader::factory (Surface& surface, int id, const char* name, Group& group)
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{
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Fader* f = new Fader (id, name, group);
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surface.faders[id] = f;
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surface.controls.push_back (f);
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group.add (*f);
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return f;
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}
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MidiByteArray
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Fader::set_position (float normalized)
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{
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position = normalized;
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return update_message ();
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}
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MidiByteArray
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Fader::update_message ()
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{
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int posi = lrintf (16383.0 * position);
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if (posi == last_update_position) {
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if (posi == llast_update_position) {
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return MidiByteArray();
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}
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}
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llast_update_position = last_update_position;
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last_update_position = posi;
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DEBUG_TRACE (DEBUG::US2400, string_compose ("generate fader message for position %1 (%2)\n", position, posi));
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return MidiByteArray (3, 0xe0 + id(), posi & 0x7f, posi >> 7);
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}
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