add 'thunder_rate' weather property

res/presets/weather/rain.json

@@ -18,5 +18,6 @@
     "fog_opacity": 0.8,
     "fog_dencity": 2.0,
     "fog_curve": 0.5,
-    "clouds": 0.5
+    "clouds": 0.5,
+    "thunder_rate": 0.1
 }

src/graphics/render/Decorator.cpp

@@ -178,6 +178,26 @@ void Decorator::update(
     const WeatherPreset& weatherA,
     const WeatherPreset& weatherB
 ) {
+    float thunderRate = weatherA.thunderRate * weatherA.intensity +
+                        weatherB.thunderRate * weatherB.intensity;
+    thunderTimer += delta;
+    util::PseudoRandom random(rand());
+    if (thunderTimer >= 1.0f) {
+        thunderTimer = 0.0f;
+        if (random.randFloat() < thunderRate) {
+            audio::play(
+                assets.get<audio::Sound>("ambient/thunder"),
+                glm::vec3(),
+                false,
+                1.0f,
+                1.0f + random.randFloat() - 0.5f,
+                false,
+                audio::PRIORITY_NORMAL,
+                audio::get_channel_index("ambient")
+            );
+        }
+    }
+
     glm::ivec3 pos = camera.position;
     for (int i = 0; i < ITERATIONS; i++) {
         update(delta, pos - glm::ivec3(UPDATE_AREA_DIAMETER / 2), pos);

src/graphics/render/Decorator.hpp

@@ -30,6 +30,7 @@ class Decorator {
     std::unordered_map<int64_t, u64id_t> playerTexts;
     int currentIndex = 0;
     NotePreset playerNamePreset {};
+    float thunderTimer = 0.0f;
 
     void update(
         float delta,

src/presets/WeatherPreset.cpp

@@ -23,6 +23,7 @@ dv::value WeatherPreset::serialize() const {
     root["fog_dencity"] = fogDencity;
     root["fog_curve"] = fogCurve;
     root["clouds"] = clouds;
+    root["thunder_rate"] = thunderRate;
 
     return root;
 }
@@ -49,4 +50,5 @@ void WeatherPreset::deserialize(const dv::value& src) {
     src.at("fog_dencity").get(fogDencity);
     src.at("fog_curve").get(fogCurve);
     src.at("clouds").get(clouds);
+    src.at("thunder_rate").get(thunderRate);
 }

src/presets/WeatherPreset.hpp

@@ -22,6 +22,7 @@ struct WeatherPreset : Serializable {
         /// @example if 0.8 then opacity range is 0.8-1.0 for 0.0-1.0 intensity
         float minOpacity = 0.0f;
         float maxOpacity = 1.0f;
+        /// @brief Clip texture by alpha channel
         bool opaque = false;
         /// @brief Fall splash
         std::optional<ParticlesPreset> splash;
@@ -37,7 +38,9 @@ struct WeatherPreset : Serializable {
     float fogCurve = 1.0f;
 
     float clouds = 0.0f;
-
+    
+    float thunderRate = 0.0f;
+    
     /// @brief Weather effects intensity
     float intensity = 1.0f;