Merge pull request #784 from MihailRis/acoustics

acoustics

.github/workflows/macos.yml

@@ -26,10 +26,14 @@ jobs:
           brew install glfw3 glew libpng openal-soft luajit libvorbis skypjack/entt/entt googletest glm
 
       - name: Configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DVOXELENGINE_BUILD_TESTS=ON -DVOXELENGINE_BUILD_APPDIR=1 -DVC_BUILD_NAME="${{ inputs.build_name }}"
+        run: |
+          cmake -DOPENAL_INCLUDE_DIR=$(brew --prefix openal-soft)/include \
+           -DOPENAL_LIBRARY=$(brew --prefix openal-soft)/lib/libopenal.dylib \
+           -S . -B build -DCMAKE_BUILD_TYPE=Release -DVOXELENGINE_BUILD_TESTS=ON -DVOXELENGINE_BUILD_APPDIR=1 -DVC_BUILD_NAME="${{ inputs.build_name }}"
 
       - name: Build
-        run: cmake --build build -t install
+        run: |
+          cmake --build build -t install
 
       - name: Make fix_dylibs.sh executable
         run: chmod +x dev/fix_dylibs.sh

res/content/base/block_materials/carpet.json

@@ -1,5 +1,6 @@
 {
     "steps-sound": "steps/carpet",
     "place-sound": "blocks/carpet_place",
-    "break-sound": "blocks/carpet_break"
+    "break-sound": "blocks/carpet_break",
+    "sound-absorption": 0.96
 }

res/content/base/block_materials/glass.json

@@ -1,5 +1,6 @@
 {
     "steps-sound": "steps/glass",
     "place-sound": "blocks/glass_place",
-    "break-sound": "blocks/glass_break"
+    "break-sound": "blocks/glass_break",
+    "sound-absorption": 0.3
 }

res/content/base/block_materials/grass.json

@@ -1,5 +1,6 @@
 {
     "steps-sound": "steps/grass",
     "place-sound": "steps/grass",
-    "break-sound": "steps/grass"
+    "break-sound": "steps/grass",
+    "sound-absorption": 0.85
 }

res/content/base/block_materials/grass_block.json

@@ -2,5 +2,6 @@
     "steps-sound": "steps/grass",
     "place-sound": "blocks/ground_place",
     "break-sound": "blocks/ground_break",
-    "hit-sound": "blocks/ground_hit"
+    "hit-sound": "blocks/ground_hit",
+    "sound-absorption": 0.8
 }

res/content/base/block_materials/ground.json

@@ -2,5 +2,6 @@
     "steps-sound": "steps/ground",
     "place-sound": "blocks/ground_place",
     "break-sound": "blocks/ground_break",
-    "hit-sound": "blocks/ground_hit"
+    "hit-sound": "blocks/ground_hit",
+    "sound-absorption": 0.7
 }

res/content/base/block_materials/metal.json

@@ -1,5 +1,6 @@
 {
     "steps-sound": "steps/metal",
     "place-sound": "blocks/metal_place",
-    "break-sound": "blocks/metal_break"
+    "break-sound": "blocks/metal_break",
+    "sound-absorption": 0.1
 }

res/content/base/block_materials/sand.json

@@ -1,5 +1,6 @@
 {
     "steps-sound": "steps/sand",
     "place-sound": "blocks/ground_place",
-    "break-sound": "blocks/ground_break"
+    "break-sound": "blocks/ground_break",
+    "sound-absorption": 0.8
 }

res/content/base/block_materials/stone.json

@@ -2,5 +2,6 @@
     "steps-sound": "steps/stone",
     "place-sound": "blocks/stone_place",
     "break-sound": "blocks/stone_break",
-    "hit-sound": "blocks/stone_hit"
+    "hit-sound": "blocks/stone_hit",
+    "sound-absorption": 0.3
 }

res/content/base/block_materials/wood.json

@@ -2,5 +2,6 @@
     "steps-sound": "steps/wood",
     "place-sound": "blocks/wood_place",
     "break-sound": "blocks/wood_break",
-    "hit-sound": "blocks/wood_hit"
+    "hit-sound": "blocks/wood_hit",
+    "sound-absorption": 0.5
 }

res/layouts/pages/settings_audio.xml.lua

@@ -24,6 +24,14 @@ function update_setting(x, id, name, postfix)
     )
 end
 
+function create_checkbox(id, name, tooltip)
+    tooltip = tooltip or ''
+    document.root:add(string.format(
+        "<checkbox consumer='function(x) app.set_setting(\"%s\", x) end' checked='%s' tooltip='%s'>%s</checkbox>",
+        id, app.str_setting(id), gui.str(tooltip, "settings"), gui.str(name, "settings")
+    ))
+end
+
 local initialized = false
 
 function on_open()
@@ -71,4 +79,6 @@ function on_open()
     if info then
         selectbox.value = info.device_specifier
     end
+
+    create_checkbox("audio.acoustic-effects", "Acoustic effects", "audio.acoustic-effects.tooltip")
 end

res/layouts/pages/settings_graphics.xml.lua

@@ -39,7 +39,7 @@ function on_open()
     create_setting("chunks.load-distance", "Load Distance", 1)
     create_setting("chunks.load-speed", "Load Speed", 1)
     create_setting("graphics.fog-curve", "Fog Curve", 0.1)
-    
+
     create_checkbox("graphics.backlight", "Backlight", "graphics.backlight.tooltip")
     create_checkbox("graphics.soft-lighting", "Soft lighting", "graphics.soft-lighting.tooltip")
     create_checkbox("graphics.dense-render", "Dense blocks render", "graphics.dense-render.tooltip")

res/texts/en_US.txt

@@ -17,6 +17,7 @@ devtools.traceback=Traceback (most recent call first)
 devtools.output=Output
 
 # Tooltips
+audio.acoustic-effects.tooltip=Acoustic effects may not be supported by your system
 graphics.gamma.tooltip=Lighting brightness curve
 graphics.backlight.tooltip=Backlight to prevent total darkness
 graphics.dense-render.tooltip=Enables transparency in blocks like leaves

res/texts/ru_RU.txt

@@ -38,6 +38,7 @@ error.dependency-version-not-met=Версия зависимости не соо
 pack.remove-confirm=Удалить весь поставляемый паком/паками контент из мира (безвозвратно)?
 
 # Подсказки
+audio.acoustic-effects.tooltip=Акустические эффекты могут не поддерживаться системой
 graphics.gamma.tooltip=Кривая яркости освещения
 graphics.backlight.tooltip=Подсветка, предотвращающая полную темноту
 graphics.dense-render.tooltip=Включает прозрачность блоков, таких как листья
@@ -111,6 +112,7 @@ settings.Windowed=Оконный
 settings.Borderless=Безрамочный
 settings.Microphone=Микрофон
 settings.microphone.None=Нет
+settings.Acoustic effects=Акустические эффекты
 
 # Управление
 chunks.reload=Перезагрузить Чанки

src/audio/AL/ALAudio.cpp

@@ -40,6 +40,22 @@ static bool check_alc_errors(ALCdevice* device, const char* context) {
     return true;
 }
 
+static LPALAUXILIARYEFFECTSLOTI alAuxiliaryEffectSloti = nullptr;
+static LPALGENAUXILIARYEFFECTSLOTS alGenAuxiliaryEffectSlots = nullptr;
+static LPALGENEFFECTS alGenEffects = nullptr;
+static LPALDELETEEFFECTS alDeleteEffects = nullptr;
+static LPALISEFFECT alIsEffect = nullptr;
+static LPALEFFECTI alEffecti = nullptr;
+static LPALEFFECTF alEffectf = nullptr;
+static LPALGENFILTERS alGenFilters = nullptr;
+static LPALDELETEFILTERS alDeleteFilters = nullptr;
+static LPALISFILTER alIsFilter = nullptr;
+static LPALFILTERI alFilteri = nullptr;
+static LPALFILTERF alFilterf = nullptr;
+
+static inline constexpr int REVERB_EFFECT = 0;
+static inline constexpr int LOWPASS_FILTER = 0;
+
 ALSound::ALSound(
     ALAudio* al, uint buffer, const std::shared_ptr<PCM>& pcm, bool keepPCM
 )
@@ -376,12 +392,19 @@ void ALSpeaker::setLoop(bool loop) {
 void ALSpeaker::play() {
     paused = false;
     manuallyStopped = false;
-    auto p_channel = get_channel(this->channel);
+    auto channel = get_channel(this->channel);
     AL_CHECK(alSourcef(
         source,
         AL_GAIN,
-        volume * p_channel->getVolume()
+        volume * channel->getVolume()
     ));
+    if (al->useEffects && channel->isEffectsApplied()) {
+        AL_CHECK(alSource3i(source, AL_AUXILIARY_SEND_FILTER, al->effectSlots[0], 0, al->filters[0]));
+        //AL_CHECK(alSourcei(source, AL_DIRECT_FILTER, al->filters[LOWPASS_FILTER])); // TODO: use lowpass filter
+    } else {
+        AL_CHECK(alSource3i(source, AL_AUXILIARY_SEND_FILTER, 0, 0, 0));
+        AL_CHECK(alSourcei(source, AL_DIRECT_FILTER, 0));
+    }
     AL_CHECK(alSourcePlay(source));
 }
 
@@ -455,15 +478,22 @@ int ALSpeaker::getPriority() const {
     return priority;
 }
 
-
 bool ALSpeaker::isManuallyStopped() const {
     return manuallyStopped;
 }
 
 static bool alc_enumeration_ext = false;
 
-ALAudio::ALAudio(ALCdevice* device, ALCcontext* context)
-    : device(device), context(context) {
+ALAudio::ALAudio(
+    ALCdevice* device,
+    ALCcontext* context,
+    bool useEffects,
+    const AudioSettings& settings
+)
+    : device(device),
+      context(context),
+      settings(settings),
+      useEffects(useEffects) {
     ALCint size;
     alcGetIntegerv(device, ALC_ATTRIBUTES_SIZE, 1, &size);
     std::vector<ALCint> attrs(size);
@@ -487,6 +517,11 @@ ALAudio::ALAudio(ALCdevice* device, ALCcontext* context)
     }
 
     alDopplerFactor(1.0 / 3.0);
+    alGetError();
+
+    if (useEffects) {
+        this->useEffects = initEffects();
+    }
 }
 
 ALAudio::~ALAudio() {
@@ -513,6 +548,80 @@ ALAudio::~ALAudio() {
     context = nullptr;
 }
 
+template<typename T>
+static bool get_proc_address(const char* name, T& ptr) {
+    ptr = (T) alGetProcAddress(name);
+    return ptr != nullptr;
+}
+
+static bool request_efx_ext_functions() {
+    return get_proc_address("alAuxiliaryEffectSloti", alAuxiliaryEffectSloti)
+        && get_proc_address("alGenAuxiliaryEffectSlots", alGenAuxiliaryEffectSlots)
+        && get_proc_address("alGenEffects", alGenEffects)
+        && get_proc_address("alDeleteEffects", alDeleteEffects)
+        && get_proc_address("alIsEffect", alIsEffect)
+        && get_proc_address("alEffecti", alEffecti)
+        && get_proc_address("alEffectf", alEffectf)
+        && get_proc_address("alGenFilters", alGenFilters)
+        && get_proc_address("alDeleteFilters", alDeleteFilters)
+        && get_proc_address("alIsFilter", alIsFilter)
+        && get_proc_address("alFilteri", alFilteri)
+        && get_proc_address("alFilterf", alFilterf);
+}
+
+bool ALAudio::initEffects() {
+    if (!request_efx_ext_functions()) {
+        logger.error() << "could not get effects extension function pointers";
+        return false;
+    }
+    for (uint i = 0; i < maxEffectSlots; i++) {
+        effectSlots.emplace_back();
+        alGenAuxiliaryEffectSlots(1, &effectSlots[i]);
+        if (alGetError() != AL_NO_ERROR) {
+            break;
+        }
+    }
+    logger.info() << "created " << effectSlots.size() << " effect slots";
+
+    for (uint i = 0; i < 4; i++) {
+        effects.emplace_back();
+        alGenEffects(1, &effects[i]);
+        if (alGetError() != AL_NO_ERROR || !alIsEffect(effects[i])) {
+            logger.error() << "could not to create effect #" << i;
+            return false;
+        }
+    }
+    logger.info() << "created " << effects.size() << " effects";
+
+    for (uint i = 0; i < filters.size(); i++) {
+        alGenFilters(1, &filters[i]);
+        if (alGetError() != AL_NO_ERROR || !alIsFilter(filters[i])) {
+            logger.error() << "could not to create filter #" << i;
+            return false;
+        }
+    }
+
+    alEffecti(effects[REVERB_EFFECT], AL_EFFECT_TYPE, AL_EFFECT_REVERB);
+    if (alGetError() != AL_NO_ERROR) {
+        logger.error() << "reverb effect is not supported";
+        return false;
+    }
+
+    alFilteri(filters[LOWPASS_FILTER], AL_FILTER_TYPE, AL_FILTER_LOWPASS);
+    if (alGetError() != AL_NO_ERROR) {
+        logger.error() << "lowpass filter is not supported";
+        return false;
+    }
+    alFilterf(filters[LOWPASS_FILTER], AL_LOWPASS_GAIN, 1.0f);
+    alFilterf(filters[LOWPASS_FILTER], AL_LOWPASS_GAINHF, 0.01f);
+
+    alAuxiliaryEffectSloti(effectSlots[0], AL_EFFECTSLOT_EFFECT, effects[0]);
+    if (alGetError() == AL_NO_ERROR) {
+        logger.info() << "successfully loaded effect into effect slot";
+    }
+    return true;
+}
+
 std::unique_ptr<Sound> ALAudio::createSound(
     std::shared_ptr<PCM> pcm, bool keepPCM
 ) {
@@ -592,19 +701,36 @@ std::unique_ptr<InputDevice> ALAudio::openInputDevice(
     );
 }
 
-std::unique_ptr<ALAudio> ALAudio::create() {
+std::unique_ptr<ALAudio> ALAudio::create(const AudioSettings& settings) {
     alc_enumeration_ext = alcIsExtensionPresent(nullptr, "ALC_ENUMERATION_EXT");
 
     ALCdevice* device = alcOpenDevice(nullptr);
-    if (device == nullptr) return nullptr;
+    if (device == nullptr) {
+        return nullptr;
+    }
+    bool effects = true;
+    ALint attribs[4] {};
+    if (alcIsExtensionPresent(device, "ALC_EXT_EFX") == AL_TRUE) {
+        logger.info() << "AL effects extension present";
+        attribs[0] = ALC_MAX_AUXILIARY_SENDS;
+        attribs[1] = 4;
+    } else {
+        logger.warning() << "AL effects extension is not supported";
+        effects = false;
+    }
     ALCcontext* context = alcCreateContext(device, nullptr);
     if (!alcMakeContextCurrent(context)) {
         alcCloseDevice(device);
         return nullptr;
     }
     AL_CHECK();
+
+    ALCint sends = 0;
+    alcGetIntegerv(device, ALC_MAX_AUXILIARY_SENDS, 1, &sends);
+    logger.info() << "device supports " << sends << " aux sends per source";
+
     logger.info() << "initialized";
-    return std::make_unique<ALAudio>(device, context);
+    return std::make_unique<ALAudio>(device, context, effects, settings);
 }
 
 uint ALAudio::getFreeSource() {
@@ -664,3 +790,84 @@ void ALAudio::setListener(
 
 void ALAudio::update(double) {
 }
+
+void ALAudio::setAcoustics(Acoustics acoustics) {
+    if (!useEffects) {
+        return;
+    }
+    if (!settings.acousticEffects.get()) {
+        alAuxiliaryEffectSloti(effectSlots[0], AL_EFFECTSLOT_EFFECT, 0);
+        return;
+    }
+    int reverbEffect = effects[REVERB_EFFECT];
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_GAIN,
+        glm::max(0.1f, glm::min(acoustics.reverbGain, 0.8f) *
+            (1.0f - glm::min(1.0f, acoustics.reverbAbsorption)))
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_REFLECTIONS_DELAY,
+        glm::clamp(
+            acoustics.reverbReflectionsDelay,
+            AL_REVERB_MIN_REFLECTIONS_DELAY,
+            AL_REVERB_MAX_REFLECTIONS_DELAY
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_LATE_REVERB_DELAY,
+        glm::clamp(
+            acoustics.reverbLateReflectionsDelay,
+            AL_REVERB_MIN_LATE_REVERB_DELAY,
+            AL_REVERB_MAX_LATE_REVERB_DELAY
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_DECAY_TIME,
+        glm::clamp(
+            acoustics.reverbDecayTime,
+            AL_REVERB_MIN_DECAY_TIME,
+            AL_REVERB_MAX_DECAY_TIME
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_ROOM_ROLLOFF_FACTOR,
+        glm::clamp(
+            acoustics.reverbRoomRolloff,
+            AL_REVERB_MIN_ROOM_ROLLOFF_FACTOR,
+            AL_REVERB_MAX_ROOM_ROLLOFF_FACTOR
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_REFLECTIONS_GAIN,
+        glm::clamp(
+            glm::pow(acoustics.reverbGain, 2.0f),
+            AL_REVERB_MIN_REFLECTIONS_GAIN,
+            AL_REVERB_MAX_REFLECTIONS_GAIN
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_LATE_REVERB_GAIN,
+        glm::clamp(
+            glm::pow(acoustics.reverbGain, 2.0f),
+            AL_REVERB_MIN_LATE_REVERB_GAIN,
+            AL_REVERB_MAX_LATE_REVERB_GAIN
+        )
+    ));
+    AL_CHECK(alEffectf(
+        reverbEffect,
+        AL_REVERB_DECAY_HFRATIO,
+        glm::clamp(
+            1.0f - acoustics.reverbAbsorption,
+            AL_REVERB_MIN_DECAY_HFRATIO,
+            AL_REVERB_MAX_DECAY_HFRATIO
+        )
+    ));
+    alAuxiliaryEffectSloti(effectSlots[0], AL_EFFECTSLOT_EFFECT, reverbEffect);
+}

src/audio/AL/ALAudio.hpp

@@ -3,19 +3,19 @@
 #include <glm/glm.hpp>
 #include <queue>
 #include <string>
+#include <array>
 #include <unordered_map>
 #include <vector>
 
 #include "typedefs.hpp"
 #include "audio/audio.hpp"
+#include "audio/effects.hpp"
 
-#ifdef __APPLE__
-#include <OpenAL/al.h>
-#include <OpenAL/alc.h>
-#else
 #include <AL/al.h>
 #include <AL/alc.h>
-#endif
+#include <AL/alext.h>
+
+struct AudioSettings;
 
 namespace audio {
     struct ALBuffer;
@@ -176,10 +176,25 @@ namespace audio {
 
         std::vector<uint> allbuffers;
         std::vector<uint> freebuffers;
-
         uint maxSources = 256;
+        uint maxEffectSlots = 64;
+
+        const AudioSettings& settings;
+
+        bool initEffects();
     public:
-        ALAudio(ALCdevice* device, ALCcontext* context);
+        std::vector<uint> effectSlots;
+        std::vector<uint> effects;
+        std::array<uint, 1> filters;
+
+        bool useEffects;
+
+        ALAudio(
+            ALCdevice* device,
+            ALCcontext* context,
+            bool effects,
+            const AudioSettings& settings
+        );
         ~ALAudio();
 
         uint getFreeSource();
@@ -214,10 +229,12 @@ namespace audio {
 
         void update(double delta) override;
 
+        void setAcoustics(Acoustics acoustics) override;
+
         bool isDummy() const override {
             return false;
         }
 
-        static std::unique_ptr<ALAudio> create();
+        static std::unique_ptr<ALAudio> create(const AudioSettings& settings);
     };
 }

src/audio/AL/alutil.hpp

@@ -1,17 +1,12 @@
 #pragma once
 
+#include "typedefs.hpp"
+
 #include <cstdint>
 #include <string>
 #include <type_traits>
 
-#include "typedefs.hpp"
-
-#ifdef __APPLE__
-#include <OpenAL/al.h>
-#else
 #include <AL/al.h>
-#endif
-
 #include <glm/glm.hpp>
 
 #define AL_CHECK(STATEMENT) \

src/audio/NoAudio.hpp

@@ -104,6 +104,9 @@ namespace audio {
         void update(double delta) override {
         }
 
+        void setAcoustics(Acoustics) override {
+        }
+
         bool isDummy() const override {
             return true;
         }

src/audio/audio.cpp

@@ -27,7 +27,8 @@ namespace {
     static bool input_enabled = false;
 }
 
-Channel::Channel(std::string name) : name(std::move(name)) {
+Channel::Channel(std::string name, bool effects)
+    : name(std::move(name)), effects(effects) {
 }
 
 float Channel::getVolume() const {
@@ -56,6 +57,10 @@ bool Channel::isPaused() const {
     return paused;
 }
 
+bool Channel::isEffectsApplied() const {
+    return effects;
+}
+
 size_t PCMStream::readFully(char* buffer, size_t bufferSize, bool loop) {
     if (!isOpen()) {
         return 0;
@@ -159,7 +164,7 @@ void audio::initialize(
     enabled = enabled && settings.enabled.get();
     if (enabled) {
         logger.info() << "initializing ALAudio backend";
-        backend = ALAudio::create().release();
+        backend = ALAudio::create(settings).release();
     }
     if (backend == nullptr) {
         if (enabled) {
@@ -171,15 +176,16 @@ void audio::initialize(
     struct {
         std::string name;
         NumberSetting* setting;
+        bool effects;
     } builtin_channels[] {
-        {"master", &settings.volumeMaster},
-        {"regular", &settings.volumeRegular},
-        {"music", &settings.volumeMusic},
-        {"ambient", &settings.volumeAmbient},
-        {"ui", &settings.volumeUI}
+        {"master", &settings.volumeMaster, false},
+        {"regular", &settings.volumeRegular, true},
+        {"music", &settings.volumeMusic, false},
+        {"ambient", &settings.volumeAmbient, true},
+        {"ui", &settings.volumeUI, false}
     };
     for (auto& channel : builtin_channels) {
-        create_channel(channel.name);
+        create_channel(channel.name, channel.effects);
         objects_keeper.keepAlive(channel.setting->observe([=](auto value) {
             audio::get_channel(channel.name)->setVolume(value * value);
         }, true));
@@ -419,12 +425,12 @@ Speaker* audio::get_speaker(speakerid_t id) {
     return found->second.get();
 }
 
-int audio::create_channel(const std::string& name) {
+int audio::create_channel(const std::string& name, bool effects) {
     int index = get_channel_index(name);
     if (index != -1) {
         return index;
     }
-    channels.emplace_back(std::make_unique<Channel>(name));
+    channels.emplace_back(std::make_unique<Channel>(name, effects));
     return channels.size() - 1;
 }
 
@@ -496,6 +502,10 @@ void audio::update(double delta) {
     }
 }
 
+void audio::set_acoustics(Acoustics acoustics) {
+    backend->setAcoustics(std::move(acoustics));
+}
+
 void audio::reset_channel(int index) {
     auto channel = get_channel(index);
     if (channel == nullptr) {

src/audio/audio.hpp

@@ -7,6 +7,7 @@
 #include "typedefs.hpp"
 #include "settings.hpp"
 #include "io/fwd.hpp"
+#include "effects.hpp"
 
 namespace audio {
     /// @brief playing speaker uid
@@ -42,8 +43,9 @@ namespace audio {
         /// @brief Channel volume setting
         float volume = 1.0f;
         bool paused = false;
+        bool effects;
     public:
-        Channel(std::string name);
+        Channel(std::string name, bool effects);
 
         /// @brief Get channel volume
         float getVolume() const;
@@ -72,6 +74,9 @@ namespace audio {
 
         /// @brief Check if the channel is paused
         bool isPaused() const;
+
+        /// @brief Check if the channel uses common acoustic effects / filters
+        bool isEffectsApplied() const;
     };
 
     /// @brief Pulse-code modulation data
@@ -394,6 +399,7 @@ namespace audio {
         virtual std::vector<std::string> getInputDeviceNames() = 0;
         virtual std::vector<std::string> getOutputDeviceNames() = 0;
         virtual void update(double delta) = 0;
+        virtual void setAcoustics(Acoustics acoustics) = 0;
 
         /// @brief Check if backend is an abstraction that does not internally
         /// work with actual audio data or play anything
@@ -547,8 +553,9 @@ namespace audio {
     /// @brief Create new channel.
     /// All non-builtin channels will be destroyed on audio::reset() call
     /// @param name channel name
+    /// @param effects use common acoustic effects / filters
     /// @return new channel index
-    int create_channel(const std::string& name);
+    int create_channel(const std::string& name, bool effects);
 
     /// @brief Get channel index by name
     /// @param name channel name
@@ -580,6 +587,8 @@ namespace audio {
     /// @param delta time elapsed since the last update (seconds)
     void update(double delta);
 
+    void set_acoustics(Acoustics acoustics);
+
     /// @brief Stop all playing audio in channel, reset channel state
     void reset_channel(int channel);
 

src/audio/effects.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <map>
+#include <string>
+#include <variant>
+#include <optional>
+
+namespace audio {
+    struct Effect {
+        struct Property {
+            using Value = std::variant<float, int>;
+            int id;
+            Value def;
+            Value min;
+            Value max;
+        };
+        std::map<std::string, Property> properties;
+    };
+
+    class EffectControl {
+    public:
+        EffectControl(const Effect* effect) : effect(effect) {};
+        virtual ~EffectControl() = default;
+
+        virtual void set(const std::string& name, Effect::Property::Value value) = 0;
+    protected:
+        const Effect* effect = nullptr;
+    };
+
+    struct Acoustics {
+        float reverbGain;
+        float reverbReflectionsDelay;
+        float reverbLateReflectionsDelay;
+        float reverbDecayTime;
+        float reverbRoomRolloff;
+        float reverbAbsorption;
+    };
+}

src/graphics/render/Decorator.cpp

@@ -23,9 +23,12 @@
 #include "io/io.hpp"
 #include "audio/audio.hpp"
 #include "maths/util.hpp"
+#include "debug/Logger.hpp"
 
 namespace fs = std::filesystem;
 
+static debug::Logger logger("decorator");
+
 /// @brief Not greater than 64 for this BIG_PRIME value
 inline constexpr int UPDATE_AREA_DIAMETER = 32;
 /// @brief Number of blocks in the volume
@@ -70,19 +73,90 @@ Decorator::Decorator(
 
 void Decorator::addParticles(const Block& def, const glm::ivec3& pos) {
     const auto& found = blockEmitters.find(pos);
-    if (found == blockEmitters.end()) {
-        auto treg = util::get_texture_region(
-            assets, def.particles->texture, ""
-        );
-        blockEmitters[pos] = renderer.particles->add(std::make_unique<Emitter>(
-            level,
-            glm::vec3{pos.x + 0.5, pos.y + 0.5, pos.z + 0.5},
-            *def.particles,
-            treg.texture,
-            treg.region,
-            -1
-        ));
+    if (found != blockEmitters.end()) {
+        return;
     }
+    auto treg = util::get_texture_region(
+        assets, def.particles->texture, ""
+    );
+    blockEmitters[pos] = renderer.particles->add(std::make_unique<Emitter>(
+        level,
+        glm::vec3{pos.x + 0.5, pos.y + 0.5, pos.z + 0.5},
+        *def.particles,
+        treg.texture,
+        treg.region,
+        -1
+    ));
+}
+
+void Decorator::updateAcoustics(const Camera& camera) {
+    audio::Acoustics acoustics {};
+    util::PseudoRandom random(34621U);
+
+    auto& chunks = *player.chunks;
+    const auto& start = camera.position;
+    float rayLength = 40.0f;
+
+    auto& blocks = level.content.getIndices()->blocks;
+
+    int rays = 100;
+    int hit = 0;
+    float averageDistance = 0.0f;
+    float averageAbsorption = 0.0f;
+    float speedOfSound = 300.0f;
+    float minDistance = rayLength;
+    for (int i = 0; i < rays; i++) {
+        float u1 = random.randFloat();
+        float u2 = random.randFloat();
+        float z = 2.0f * u1 - 1.0f;
+        float phi = 2.0f * glm::pi<float>() * u2;
+        float r = std::sqrt(1.0f - z * z);
+
+        glm::vec3 dir = { r * std::cos(phi), r * std::sin(phi), z };
+
+        dir = glm::normalize(dir);
+        glm::vec3 end;
+        glm::ivec3 norm;
+        glm::ivec3 iend;
+        auto vox = chunks.rayCast(start, dir, rayLength, end, norm, iend);
+        if (vox == nullptr) {
+            continue;
+        }
+        auto distance = glm::distance(start, end);
+        if (distance >= rayLength * 0.98f) {
+            continue;
+        }
+        if (distance < minDistance) {
+            minDistance = distance;
+        }
+        auto def = blocks.get(vox->id);
+        if (def == nullptr) {
+            continue;
+        }
+        auto material = level.content.findBlockMaterial(def->material);
+        if (material == nullptr) {
+            return;
+        }
+        hit++;
+        averageDistance += distance;
+        averageAbsorption += material->soundAbsorption;
+    }
+    if (hit > 0) {
+        averageDistance /= hit;
+        averageAbsorption /= hit;
+    }
+
+    float decayTime = 20.0f * (averageDistance / rayLength);
+    float escapeRatio = static_cast<float>(rays - hit) / static_cast<float>(rays);
+
+    acoustics.reverbGain = glm::pow(hit / static_cast<float>(rays), 3.0f);
+    acoustics.reverbReflectionsDelay = minDistance / speedOfSound;
+    acoustics.reverbLateReflectionsDelay = averageDistance / speedOfSound;
+    acoustics.reverbDecayTime = decayTime;
+    acoustics.reverbRoomRolloff = escapeRatio * 1.5f;
+    acoustics.reverbAbsorption = averageAbsorption;
+
+    audio::set_acoustics(std::move(acoustics));
 }
 
 void Decorator::updateRandom(
@@ -283,4 +357,5 @@ void Decorator::update(
     }
     updateBlockEmitters(camera);
     updateTextNotes();
+    updateAcoustics(camera);
 }

src/graphics/render/Decorator.hpp

@@ -48,6 +48,7 @@ class Decorator {
     void updateBlockEmitters(const Camera& camera);
     void updateTextNotes();
     void addParticles(const Block& def, const glm::ivec3& pos);
+    void updateAcoustics(const Camera& camera);
 public:
     Decorator(
         Engine& engine,

src/io/settings_io.cpp

@@ -44,6 +44,7 @@ SettingsHandler::SettingsHandler(EngineSettings& settings) {
     builder.add("volume-ambient", &settings.audio.volumeAmbient);
     builder.add("volume-music", &settings.audio.volumeMusic);
     builder.add("input-device", &settings.audio.inputDevice);
+    builder.add("acoustic-effects", &settings.audio.acousticEffects);
 
     builder.addSection("display");
     builder.add("width", &settings.display.width);

src/settings.hpp

@@ -18,6 +18,8 @@ struct AudioSettings {
     NumberSetting volumeMusic {1.0f, 0.0f, 1.0f, setting_format::percent};
 
     StringSetting inputDevice {"auto"};
+
+    FlagSetting acousticEffects {true};
 };
 
 struct DisplaySettings {

src/voxels/Block.cpp

@@ -24,7 +24,8 @@ dv::value BlockMaterial::serialize() const {
         {"steps-sound", stepsSound},
         {"place-sound", placeSound},
         {"break-sound", breakSound},
-        {"hit-sound", hitSound}
+        {"hit-sound", hitSound},
+        {"sound-absorption", soundAbsorption}
     });
 }
 
@@ -34,6 +35,7 @@ void BlockMaterial::deserialize(const dv::value& src) {
     src.at("place-sound").get(placeSound);
     src.at("break-sound").get(breakSound);
     src.at("hit-sound").get(hitSound);
+    src.at("sound-absorption").get(soundAbsorption);
 }
 
 CoordSystem::CoordSystem(glm::ivec3 axisX, glm::ivec3 axisY, glm::ivec3 axisZ)

src/voxels/Block.hpp

@@ -147,6 +147,7 @@ struct BlockMaterial : Serializable {
     std::string placeSound;
     std::string breakSound;
     std::string hitSound;
+    float soundAbsorption = 0.5f;
 
     dv::value toTable() const; // for compatibility
     dv::value serialize() const override;