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serenity/Applications/Piano/KnobsWidget.cpp
William McPherson 59bde64ba6 Piano: Add release 
Notice that we are calculating release time according to the level when
the note is turned off rather than the sustain level. Naively using the
sustain level gives very long release times if you turn the note off
during attack, whereas this deterministically gives the same release
time.
2020-02-05 17:52:10 +01:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "KnobsWidget.h"
#include "AudioEngine.h"
#include "MainWidget.h"
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GLabel.h>
#include <LibGUI/GSlider.h>
KnobsWidget::KnobsWidget(GUI::Widget* parent, AudioEngine& audio_engine, MainWidget& main_widget)
: GUI::Frame(parent)
, m_audio_engine(audio_engine)
, m_main_widget(main_widget)
{
set_frame_thickness(2);
set_frame_shadow(FrameShadow::Sunken);
set_frame_shape(FrameShape::Container);
set_layout(make<GUI::VBoxLayout>());
set_fill_with_background_color(true);
m_labels_container = GUI::Widget::construct(this);
m_labels_container->set_layout(make<GUI::HBoxLayout>());
m_labels_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
m_labels_container->set_preferred_size(0, 20);
m_octave_label = GUI::Label::construct("Octave", m_labels_container);
m_wave_label = GUI::Label::construct("Wave", m_labels_container);
m_attack_label = GUI::Label::construct("Attack", m_labels_container);
m_decay_label = GUI::Label::construct("Decay", m_labels_container);
m_sustain_label = GUI::Label::construct("Sustain", m_labels_container);
m_release_label = GUI::Label::construct("Release", m_labels_container);
m_delay_label = GUI::Label::construct("Delay", m_labels_container);
m_values_container = GUI::Widget::construct(this);
m_values_container->set_layout(make<GUI::HBoxLayout>());
m_values_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
m_values_container->set_preferred_size(0, 10);
m_octave_value = GUI::Label::construct(String::number(m_audio_engine.octave()), m_values_container);
m_wave_value = GUI::Label::construct(wave_strings[m_audio_engine.wave()], m_values_container);
m_attack_value = GUI::Label::construct(String::number(m_audio_engine.attack()), m_values_container);
m_decay_value = GUI::Label::construct(String::number(m_audio_engine.decay()), m_values_container);
m_sustain_value = GUI::Label::construct(String::number(m_audio_engine.sustain()), m_values_container);
m_release_value = GUI::Label::construct(String::number(m_audio_engine.release()), m_values_container);
m_delay_value = GUI::Label::construct(String::number(m_audio_engine.delay() / m_audio_engine.tick()), m_values_container);
m_knobs_container = GUI::Widget::construct(this);
m_knobs_container->set_layout(make<GUI::HBoxLayout>());
// FIXME: Implement vertical flipping in GSlider, not here.
m_octave_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_octave_knob->set_tooltip("Z: octave down, X: octave up");
m_octave_knob->set_range(octave_min - 1, octave_max - 1);
m_octave_knob->set_value((octave_max - 1) - (m_audio_engine.octave() - 1));
m_octave_knob->on_value_changed = [this](int value) {
int new_octave = octave_max - value;
if (m_change_octave)
m_main_widget.set_octave_and_ensure_note_change(new_octave == m_audio_engine.octave() + 1 ? Up : Down);
ASSERT(new_octave == m_audio_engine.octave());
m_octave_value->set_text(String::number(new_octave));
};
m_wave_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_wave_knob->set_tooltip("C: cycle through waveforms");
m_wave_knob->set_range(0, last_wave);
m_wave_knob->set_value(last_wave - m_audio_engine.wave());
m_wave_knob->on_value_changed = [this](int value) {
int new_wave = last_wave - value;
m_audio_engine.set_wave(new_wave);
ASSERT(new_wave == m_audio_engine.wave());
m_wave_value->set_text(wave_strings[new_wave]);
};
constexpr int max_attack = 1000;
m_attack_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_attack_knob->set_range(0, max_attack);
m_attack_knob->set_value(max_attack - m_audio_engine.attack());
m_attack_knob->on_value_changed = [this](int value) {
int new_attack = max_attack - value;
m_audio_engine.set_attack(new_attack);
ASSERT(new_attack == m_audio_engine.attack());
m_attack_value->set_text(String::number(new_attack));
};
constexpr int max_decay = 1000;
m_decay_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_decay_knob->set_range(0, max_decay);
m_decay_knob->set_value(max_decay - m_audio_engine.decay());
m_decay_knob->on_value_changed = [this](int value) {
int new_decay = max_decay - value;
m_audio_engine.set_decay(new_decay);
ASSERT(new_decay == m_audio_engine.decay());
m_decay_value->set_text(String::number(new_decay));
};
constexpr int max_sustain = 1000;
m_sustain_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_sustain_knob->set_range(0, max_sustain);
m_sustain_knob->set_value(max_sustain - m_audio_engine.sustain());
m_sustain_knob->on_value_changed = [this](int value) {
int new_sustain = max_sustain - value;
m_audio_engine.set_sustain(new_sustain);
ASSERT(new_sustain == m_audio_engine.sustain());
m_sustain_value->set_text(String::number(new_sustain));
};
constexpr int max_release = 1000;
m_release_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_release_knob->set_range(0, max_release);
m_release_knob->set_value(max_release - m_audio_engine.release());
m_release_knob->on_value_changed = [this](int value) {
int new_release = max_release - value;
m_audio_engine.set_release(new_release);
ASSERT(new_release == m_audio_engine.release());
m_release_value->set_text(String::number(new_release));
};
constexpr int max_delay = 8;
m_delay_knob = GUI::Slider::construct(Orientation::Vertical, m_knobs_container);
m_delay_knob->set_range(0, max_delay);
m_delay_knob->set_value(max_delay - (m_audio_engine.delay() / m_audio_engine.tick()));
m_delay_knob->on_value_changed = [this](int value) {
int new_delay = m_audio_engine.tick() * (max_delay - value);
m_audio_engine.set_delay(new_delay);
ASSERT(new_delay == m_audio_engine.delay());
m_delay_value->set_text(String::number(new_delay / m_audio_engine.tick()));
};
}
KnobsWidget::~KnobsWidget()
{
}
void KnobsWidget::update_knobs()
{
m_wave_knob->set_value(last_wave - m_audio_engine.wave());
// FIXME: This is needed because when the slider is changed directly, it
// needs to change the octave, but if the octave was changed elsewhere, we
// need to change the slider without changing the octave.
m_change_octave = false;
m_octave_knob->set_value(octave_max - m_audio_engine.octave());
m_change_octave = true;
}
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