mirror of https://github.com/minetest/minetest.git
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/*
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Minetest
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Copyright (C) 2022 DS
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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OpenAL support based on work by:
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Copyright (C) 2011 Sebastian 'Bahamada' Rühl
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Copyright (C) 2011 Cyriaque 'Cisoun' Skrapits <cysoun@gmail.com>
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Copyright (C) 2011 Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include "sound_data.h"
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namespace sound { struct ALExtensions; }
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namespace sound {
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/**
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* A sound that is currently played.
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* Can be streaming.
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* Can be fading.
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*/
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class PlayingSound final
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{
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struct FadeState {
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f32 step;
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f32 target_gain;
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};
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ALuint m_source_id;
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std::shared_ptr<ISoundDataOpen> m_data;
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ALuint m_next_sample_pos = 0;
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bool m_looping;
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bool m_is_positional;
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bool m_stopped_means_dead = true;
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std::optional<FadeState> m_fade_state = std::nullopt;
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public:
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PlayingSound(ALuint source_id, std::shared_ptr<ISoundDataOpen> data, bool loop,
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f32 volume, f32 pitch, f32 start_time,
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const std::optional<std::pair<v3f, v3f>> &pos_vel_opt,
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const ALExtensions &exts [[maybe_unused]]);
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~PlayingSound() noexcept
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{
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alDeleteSources(1, &m_source_id);
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}
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DISABLE_CLASS_COPY(PlayingSound)
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// return false means streaming finished
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bool stepStream();
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// retruns true if it wasn't fading already
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bool fade(f32 step, f32 target_gain) noexcept;
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// returns true if more fade is needed later
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bool doFade(f32 dtime) noexcept;
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void updatePosVel(const v3f &pos, const v3f &vel) noexcept;
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void setGain(f32 gain) noexcept;
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f32 getGain() noexcept;
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void setPitch(f32 pitch) noexcept { alSourcef(m_source_id, AL_PITCH, pitch); }
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bool isStreaming() const noexcept { return m_data->isStreaming(); }
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void play() noexcept { alSourcePlay(m_source_id); }
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// returns one of AL_INITIAL, AL_PLAYING, AL_PAUSED, AL_STOPPED
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ALint getState() noexcept
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{
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ALint state;
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alGetSourcei(m_source_id, AL_SOURCE_STATE, &state);
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return state;
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}
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bool isDead() noexcept
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{
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// streaming sounds can (but should not) stop because the queue runs empty
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return m_stopped_means_dead && getState() == AL_STOPPED;
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}
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void pause() noexcept
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{
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// this is a NOP if state != AL_PLAYING
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alSourcePause(m_source_id);
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}
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void resume() noexcept
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{
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if (getState() == AL_PAUSED)
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play();
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}
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};
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} // namespace sound
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