test acoustics

src/audio/AL/ALAudio.cpp

@@ -780,15 +780,18 @@ void ALAudio::setListener(
     AL_CHECK(alListenerf(AL_GAIN, get_channel(0)->getVolume()));
 }
 
-void ALAudio::update(double delta) {
+void ALAudio::update(double) {
+}
+
+void ALAudio::setAcoustics(Acoustics acoustics) {
     if (!useEffects) {
         return;
     }
     int reverbEffect = effects[REVERB_EFFECT];
-    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_DECAY_TIME, 1.0f));
-    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_ROOM_ROLLOFF_FACTOR, 0.07f));
-    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_GAIN, 0.0f));
-    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_GAINHF, 0.0f));
-    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_REFLECTIONS_GAIN, 0.0f));
+    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_DECAY_TIME, std::max<float>(0.1f, acoustics.reverbDecayTime)));
+    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_ROOM_ROLLOFF_FACTOR, 0.14f));
+    // AL_CHECK(alEffectf(reverbEffect, AL_REVERB_GAIN, 0.0f));
+    // AL_CHECK(alEffectf(reverbEffect, AL_REVERB_GAINHF, 0.0f));
+    AL_CHECK(alEffectf(reverbEffect, AL_REVERB_REFLECTIONS_GAIN, 0.5f));
     alAuxiliaryEffectSloti(effectSlots[0], AL_EFFECTSLOT_EFFECT, reverbEffect);
 }

src/audio/AL/ALAudio.hpp

@@ -226,6 +226,8 @@ namespace audio {
 
         void update(double delta) override;
 
+        void setAcoustics(Acoustics acoustics) override;
+
         bool isDummy() const override {
             return false;
         }

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

@@ -496,6 +496,10 @@ 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
@@ -394,6 +395,7 @@ 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
@@ -580,6 +582,8 @@ 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

@@ -26,4 +26,8 @@ namespace audio {
     protected:
         const Effect* effect = nullptr;
     };
+
+    struct Acoustics {
+        float reverbDecayTime;
+    };
 }

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 +73,56 @@ 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(0x34621B361);
+
+    auto& chunks = *player.chunks;
+    const auto& start = camera.position;
+    float rayLength = 40.0f;
+
+    int rays = 100;
+    int hit = 0;
+    float averageDistance = 0.0f;
+    for (int i = 0; i < rays; i++) {
+        glm::vec3 dir {
+            random.randFloat() - 0.5f,
+            random.randFloat() - 0.5f,
+            random.randFloat() - 0.5f,
+        };
+        dir = glm::normalize(dir);
+        auto end = chunks.rayCastToObstacle(start, dir, rayLength);
+        auto distance = glm::distance(start, end);
+        if (distance >= rayLength * 0.98f) {
+            continue;
+        }
+        hit++;
+        averageDistance += distance * 0.2f;
+    }
+    float decayTime = (averageDistance / hit) * ((hit / static_cast<float>(rays)) - 0.6f) * 1.6f;
+    decayTime *= 2.5f;
+    decayTime *= decayTime;
+    logger.info() << "rays hit " << hit << "/" << rays << " decay-time: " << decayTime;
+
+
+    acoustics.reverbDecayTime = decayTime;
+    audio::set_acoustics(std::move(acoustics));
 }
 
 void Decorator::updateRandom(
@@ -283,4 +323,5 @@ 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,