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Piano: Use LibDSP to implement delay
This is the first step in transitioning Piano to a full LibDSP backend. For now, the delay effect is replaced with a (mostly identical) implementation in LibDSP. The new ProcessorParameterSlider attaches to a LibDSP::Processor's range parameter (LibDSP::ProcessorRangeParameter) and changes it automatically. It also has the ability to update an external GUI::Label. This is used for the three delay parameters and it will become useful for auto-generating UI for Processors.
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8 changed files with 84 additions and 49 deletions
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Userland/Applications/Piano/ProcessorParameterSlider.cpp
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Userland/Applications/Piano/ProcessorParameterSlider.cpp
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/*
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* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "ProcessorParameterSlider.h"
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ProcessorParameterSlider::ProcessorParameterSlider(Orientation orientation, LibDSP::ProcessorRangeParameter& parameter, RefPtr<GUI::Label> value_label)
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: Slider(orientation)
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, m_parameter(parameter)
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, m_value_label(move(value_label))
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{
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set_range(m_parameter.min_value().raw(), m_parameter.max_value().raw());
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set_value(m_parameter.value().raw());
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set_step((m_parameter.min_value() - m_parameter.max_value()).raw() / 128);
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set_tooltip(m_parameter.name());
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on_change = [this](auto value) {
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LibDSP::ParameterFixedPoint real_value;
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real_value.raw() = value;
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m_parameter.set_value_sneaky(real_value, LibDSP::Detail::ProcessorParameterSetValueTag {});
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if (m_value_label)
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m_value_label->set_text(String::formatted("{:.2f}", static_cast<double>(m_parameter)));
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};
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m_parameter.did_change_value = [this](auto value) {
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set_value(value.raw());
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};
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}
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