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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* staminafilter.cc
*
* Sat Jun 11 08:49:36 CEST 2016
* Copyright 2016 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "staminafilter.h"
#include "settings.h"
StaminaFilter::StaminaFilter(Settings& settings)
: settings(settings)
{
}
bool StaminaFilter::filter(event_t& event, size_t pos)
{
// Read out all values from settings.
auto samplerate = settings.samplerate.load();
auto velocity_modifier_falloff = settings.velocity_modifier_falloff.load();
auto enable_velocity_modifier = settings.enable_velocity_modifier.load();
auto velocity_modifier_weight = settings.velocity_modifier_weight.load();
if(modifiers.find(event.instrument) == modifiers.end())
{
// On first lookup make sure we have sane values.
auto& pair = modifiers[event.instrument];
pair.first = 1.0f;
pair.second = 0;
}
auto& pair = modifiers[event.instrument];
auto& mod = pair.first;
auto& lastpos = pair.second;
if(enable_velocity_modifier == false)
{
mod = 1.0f;
lastpos = 0;
}
if(enable_velocity_modifier)
{
mod += (pos - lastpos) / (samplerate * velocity_modifier_falloff);
if(mod > 1.0f)
{
mod = 1.0f;
}
}
event.velocity *= mod;
if(enable_velocity_modifier)
{
lastpos = pos;
mod *= velocity_modifier_weight;
}
{
auto velocity_modifier_current = settings.velocity_modifier_current.load();
float p = 0.9f;
float new_value = mod * p + velocity_modifier_current * (1.0f - p);
if(mod > new_value)
{
new_value = mod;
}
settings.velocity_modifier_current.store(new_value);
}
return true;
}
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