mirror of
https://github.com/robbert-vdh/yabridge.git
synced 2026-05-08 04:20:13 +02:00
Robbert van der Helm
da8f4aae19
Events, parameter changes, and the individual queues contained within the parameter changes all use dynamic memory allocation. Preallocating some memory for those things inside of the objects may prevent latency spikes when they those objects are first filled. This is especially useful for the parameter changes since there's no way to reserve memory in a vector of vectors.
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
// yabridge: a Wine VST bridge
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// Copyright (C) 2020-2021 Robbert van der Helm
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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 3 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
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#pragma once
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#include <pluginterfaces/vst/ivstparameterchanges.h>
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#include <boost/container/small_vector.hpp>
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#include "../../bitsery/traits/small-vector.h"
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#include "base.h"
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#include "param-value-queue.h"
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
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/**
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* Wraps around `IParameterChanges` for serialization purposes. Used in
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* `YaProcessData`.
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*/
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class YaParameterChanges : public Steinberg::Vst::IParameterChanges {
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public:
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/**
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* We only provide a default constructor here, because we need to fill the
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* existing object with new data every processing cycle to avoid
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* reallocating a new object every time.
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*/
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YaParameterChanges() noexcept;
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~YaParameterChanges() noexcept;
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/**
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* Remove all parameter changes. Used when a null pointer gets passed to the
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* input parameters field, and so the plugin can output its own parameter
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* changes.
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*/
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void clear() noexcept;
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/**
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* Read data from an `IParameterChanges` object into this existing object.
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*/
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void repopulate(Steinberg::Vst::IParameterChanges& original_queues);
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DECLARE_FUNKNOWN_METHODS
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/**
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* Return the number of parameter we have parameter change queues for. Used
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* in debug logs.
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*/
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size_t num_parameters() const;
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/**
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* Write these changes back to an output parameter changes queue on the
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* `ProcessData` object provided by the host.
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*/
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void write_back_outputs(
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Steinberg::Vst::IParameterChanges& output_queues) const;
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// From `IParameterChanges`
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int32 PLUGIN_API getParameterCount() override;
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Steinberg::Vst::IParamValueQueue* PLUGIN_API
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getParameterData(int32 index) override;
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Steinberg::Vst::IParamValueQueue* PLUGIN_API
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addParameterData(const Steinberg::Vst::ParamID& id,
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int32& index /*out*/) override;
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template <typename S>
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void serialize(S& s) {
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s.container(queues, 1 << 16);
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}
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private:
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/**
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* The parameter value changes queues.
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*/
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boost::container::small_vector<YaParamValueQueue, 16> queues;
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};
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#pragma GCC diagnostic pop
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