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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
// DR. ROBOTNIK'S RING RACERS
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//-----------------------------------------------------------------------------
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// Copyright (C) 2025 by Ronald "Eidolon" Kinard
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// Copyright (C) 2025 by Kart Krew
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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#include "mixer.hpp"
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#include <algorithm>
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using std::shared_ptr;
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using std::size_t;
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using srb2::audio::Mixer;
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using srb2::audio::Sample;
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using srb2::audio::Source;
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namespace
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{
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template <size_t C>
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void default_init_sample_buffer(Sample<C>* buffer, size_t size)
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{
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std::for_each(buffer, buffer + size, [](auto& i) { i = Sample<C> {}; });
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}
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template <size_t C>
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void mix_sample_buffers(Sample<C>* dst, size_t size, Sample<C>* src, size_t src_size)
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{
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for (size_t i = 0; i < size && i < src_size; i++)
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{
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dst[i] += src[i];
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}
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}
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} // namespace
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template <size_t C>
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size_t Mixer<C>::generate(tcb::span<Sample<C>> buffer)
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{
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buffer_.resize(buffer.size());
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default_init_sample_buffer<C>(buffer.data(), buffer.size());
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for (auto& source : sources_)
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{
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size_t read = source->generate(buffer_);
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mix_sample_buffers<C>(buffer.data(), buffer.size(), buffer_.data(), read);
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}
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// because we initialized the out-buffer, we always generate size samples
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return buffer.size();
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}
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template <size_t C>
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void Mixer<C>::add_source(const shared_ptr<Source<C>>& source)
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{
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sources_.push_back(source);
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}
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template <size_t C>
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Mixer<C>::~Mixer() = default;
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template class srb2::audio::Mixer<1>;
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template class srb2::audio::Mixer<2>;
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