Merge pull request #462 from MihailRis/precipitation

Weather

res/content/base/preload.json

@@ -5,7 +5,9 @@
     "sounds": [
         "blocks/door_open",
         "blocks/door_close",
-        "events/pickup"
+        "events/pickup",
+        "ambient/rain",
+        "ambient/thunder"
     ],
     "models": [
         "drop-item"

res/preload.json

@@ -20,6 +20,8 @@
         "gui/refresh",
         "gui/folder_icon",
         "gui/settings_icon",
+        "misc/rain",
+        "misc/snow",
         "gui/check_mark",
         "gui/left_arrow",
         "gui/right_arrow"

res/presets/weather/clear.json

@@ -0,0 +1 @@
+{}

res/presets/weather/cloudy.json

@@ -0,0 +1,4 @@
+{
+    "clouds": 0.8
+}
+

res/presets/weather/fog.json

@@ -0,0 +1,6 @@
+{
+    "fog_opacity": 0.98,
+    "fog_dencity": 3.6,
+    "fog_curve": 0.25,
+    "clouds": 0.8
+}

res/presets/weather/rain.json

@@ -0,0 +1,23 @@
+{
+    "fall": {
+        "vspeed": 2.0,
+        "texture": "misc/rain",
+        "noise": "ambient/rain",
+        "splash": {
+            "lifetime": 0.2,
+            "spawn_interval": 0.0,
+            "size": [0.2, 0.2, 0.2],
+            "frames": [
+                "particles:rain_splash_0",
+                "particles:rain_splash_1",
+                "particles:rain_splash_2"
+            ]
+        },
+        "min_opacity": 0.8,
+        "max_intensity": 0.5
+    },
+    "fog_opacity": 0.5,
+    "fog_dencity": 1.7,
+    "fog_curve": 0.5,
+    "clouds": 0.9
+}

res/presets/weather/snow.json

@@ -0,0 +1,15 @@
+{
+    "fall": {
+        "vspeed": 0.75,
+        "hspeed": 0.5,
+        "texture": "misc/snow",
+        "scale": 0.35,
+        "opaque": true,
+        "min_opacity": 0.8,
+        "max_opacity": 2.0
+    },
+    "fog_opacity": 0.8,
+    "fog_dencity": 2.5,
+    "fog_curve": 0.5,
+    "clouds": 0.5
+}

res/presets/weather/thunder.json

@@ -0,0 +1,23 @@
+{
+    "fall": {
+        "vspeed": 2.0,
+        "texture": "misc/rain",
+        "noise": "ambient/rain",
+        "splash": {
+            "lifetime": 0.2,
+            "spawn_interval": 0.0,
+            "size": [0.2, 0.2, 0.2],
+            "frames": [
+                "particles:rain_splash_0",
+                "particles:rain_splash_1",
+                "particles:rain_splash_2"
+            ]
+        },
+        "min_opacity": 0.8
+    },
+    "fog_opacity": 0.8,
+    "fog_dencity": 2.0,
+    "fog_curve": 0.5,
+    "clouds": 0.7,
+    "thunder_rate": 0.1
+}

res/scripts/stdcmd.lua

@@ -264,6 +264,33 @@ console.add_command(
     end
 )
 
+console.add_command(
+    "weather.set name:str time:num=1",
+    "Change weather",
+    function (args, kwargs)
+        local filename = file.find("presets/weather/"..args[1]..".json")
+        if not filename then
+            return "weather preset not found"
+        end
+        local preset = json.parse(file.read(filename))
+        gfx.weather.change(preset, args[2], args[1])
+        return "weather set to "..filename.." preset ("..tostring(args[2]).." s)"
+    end
+)
+
+console.add_command(
+    "weather",
+    "Display current weather preset name",
+    function (args, kwargs)
+        local name = gfx.weather.get_current()
+        if name == "" then
+            return "unnamed " .. json.tostring(gfx.weather.get_current_data(), true)
+        else
+            return name
+        end
+    end
+)
+
 console.cheats = {
     "blocks.fill",
     "tp",
@@ -271,5 +298,6 @@ console.cheats = {
     "time.set",
     "time.daycycle",
     "entity.despawn",
-    "player.respawn"
+    "player.respawn",
+    "weather.set",
 }

res/shaders/entity.glslf

@@ -1,7 +1,7 @@
 in vec4 a_color;
 in vec2 a_texCoord;
-in float a_distance;
 in vec3 a_dir;
+in float a_fog;
 out vec4 f_color;
 
 uniform sampler2D u_texture0;
@@ -14,12 +14,10 @@ uniform bool u_alphaClip;
 void main() {
     vec3 fogColor = texture(u_cubemap, a_dir).rgb;
     vec4 tex_color = texture(u_texture0, a_texCoord);
-    float depth = (a_distance/256.0);
     float alpha = a_color.a * tex_color.a;
     // anyway it's any alpha-test alternative required
-    if (alpha < (u_alphaClip ? 0.5f : 0.2f))
+    if (alpha < (u_alphaClip ? 0.5f : 0.15f))
         discard;
-    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), 
+    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), a_fog);
-              min(1.0, pow(depth*u_fogFactor, u_fogCurve)));
     f_color.a = alpha;
 }

res/shaders/entity.glslv

@@ -7,7 +7,7 @@ layout (location = 3) in float v_light;
 
 out vec4 a_color;
 out vec2 a_texCoord;
-out float a_distance;
+out float a_fog;
 out vec3 a_dir;
 
 uniform mat4 u_model;
@@ -15,6 +15,12 @@ uniform mat4 u_proj;
 uniform mat4 u_view;
 uniform vec3 u_cameraPos;
 uniform float u_gamma;
+uniform float u_opacity;
+uniform float u_fogFactor;
+uniform float u_fogCurve;
+uniform float u_weatherFogOpacity;
+uniform float u_weatherFogDencity;
+uniform float u_weatherFogCurve;
 uniform samplerCube u_cubemap;
 
 uniform vec3 u_torchlightColor;
@@ -36,6 +42,11 @@ void main() {
     a_dir = modelpos.xyz - u_cameraPos;
     vec3 skyLightColor = pick_sky_color(u_cubemap);
     a_color.rgb = max(a_color.rgb, skyLightColor.rgb*decomp_light.a) * v_color;
-    a_distance = length(u_view * u_model * vec4(pos3d * FOG_POS_SCALE, 0.0));
+    a_color.a = u_opacity;
+
+    float dist = length(u_view * u_model * vec4(pos3d * FOG_POS_SCALE, 0.0));
+    float depth = (dist / 256.0);
+    a_fog = min(1.0, max(pow(depth * u_fogFactor, u_fogCurve),
+                         min(pow(depth * u_weatherFogDencity, u_weatherFogCurve), u_weatherFogOpacity)));
     gl_Position = u_proj * u_view * modelpos;
 }

res/shaders/main.glslf

@@ -1,20 +1,16 @@
 in vec4 a_color;
 in vec2 a_texCoord;
-in float a_distance;
+in float a_fog;
 in vec3 a_dir;
 out vec4 f_color;
 
 uniform sampler2D u_texture0;
 uniform samplerCube u_cubemap;
-uniform vec3 u_fogColor;
-uniform float u_fogFactor;
-uniform float u_fogCurve;
 uniform bool u_alphaClip;
 
 void main() {
     vec3 fogColor = texture(u_cubemap, a_dir).rgb;
     vec4 tex_color = texture(u_texture0, a_texCoord);
-    float depth = (a_distance/256.0);
     float alpha = a_color.a * tex_color.a;
     if (u_alphaClip) {
         if (alpha < 0.2f)
@@ -24,7 +20,6 @@ void main() {
         if (alpha < 0.002f)
             discard;
     }
-    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), 
+    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), a_fog);
-              min(1.0, pow(depth*u_fogFactor, u_fogCurve)));
     f_color.a = alpha;
 }

res/shaders/main.glslv

@@ -7,6 +7,7 @@ layout (location = 2) in float v_light;
 out vec4 a_color;
 out vec2 a_texCoord;
 out float a_distance;
+out float a_fog;
 out vec3 a_dir;
 
 uniform mat4 u_model;
@@ -14,6 +15,12 @@ uniform mat4 u_proj;
 uniform mat4 u_view;
 uniform vec3 u_cameraPos;
 uniform float u_gamma;
+uniform float u_fogFactor;
+uniform float u_fogCurve;
+uniform float u_weatherFogOpacity;
+uniform float u_weatherFogDencity;
+uniform float u_weatherFogCurve;
+uniform float u_timer;
 uniform samplerCube u_cubemap;
 
 uniform vec3 u_torchlightColor;
@@ -35,6 +42,10 @@ void main() {
     a_dir = modelpos.xyz - u_cameraPos;
     vec3 skyLightColor = pick_sky_color(u_cubemap);
     a_color.rgb = max(a_color.rgb, skyLightColor.rgb*decomp_light.a);
+
     a_distance = length(u_view * u_model * vec4(pos3d * FOG_POS_SCALE, 0.0));
+    float depth = (a_distance / 256.0);
+    a_fog = min(1.0, max(pow(depth * u_fogFactor, u_fogCurve),
+                         min(pow(depth * u_weatherFogDencity, u_weatherFogCurve), u_weatherFogOpacity)));
     gl_Position = u_proj * u_view * modelpos;
 }

src/frontend/screens/LevelScreen.cpp

@@ -36,10 +36,14 @@
 
 static debug::Logger logger("level-screen");
 
+inline const io::path CLIENT_FILE = "world:client/environment.json";
+
 LevelScreen::LevelScreen(
     Engine& engine, std::unique_ptr<Level> levelPtr, int64_t localPlayer
 )
-    : Screen(engine), postProcessing(std::make_unique<PostProcessing>()) {
+    : Screen(engine),
+      world(*levelPtr->getWorld()),
+      postProcessing(std::make_unique<PostProcessing>()) {
     Level* level = levelPtr.get();
 
     auto& settings = engine.getSettings();
@@ -62,22 +66,22 @@ LevelScreen::LevelScreen(
     frontend = std::make_unique<LevelFrontend>(
         player, controller.get(), assets, settings
     );
-    worldRenderer = std::make_unique<WorldRenderer>(
+    renderer = std::make_unique<WorldRenderer>(
         engine, *frontend, *player
     );
     hud = std::make_unique<Hud>(engine, *frontend, *player);
 
     decorator = std::make_unique<Decorator>(
-        engine, *controller, *worldRenderer, assets, *player
+        engine, *controller, *renderer, assets, *player
     );
 
     keepAlive(settings.graphics.backlight.observe([=](bool) {
         player->chunks->saveAndClear();
-        worldRenderer->clear();
+        renderer->clear();
     }));
     keepAlive(settings.graphics.denseRender.observe([=](bool) {
         player->chunks->saveAndClear();
-        worldRenderer->clear();
+        renderer->clear();
         frontend->getContentGfxCache().refresh();
     }));
     keepAlive(settings.camera.fov.observe([=](double value) {
@@ -85,22 +89,35 @@ LevelScreen::LevelScreen(
     }));
     keepAlive(Events::getBinding(BIND_CHUNKS_RELOAD).onactived.add([=](){
         player->chunks->saveAndClear();
-        worldRenderer->clear();
+        renderer->clear();
         return false;
     }));
 
     animator = std::make_unique<TextureAnimator>();
     animator->addAnimations(assets.getAnimations());
 
+    loadDecorations();
     initializeContent();
 }
 
+LevelScreen::~LevelScreen() {
+    if (!controller->getLevel()->getWorld()->isNameless()) {
+        saveDecorations();
+        saveWorldPreview();
+    }
+    scripting::on_frontend_close();
+    // unblock all bindings
+    Events::enableBindings();
+    controller->onWorldQuit();
+    engine.getPaths().setCurrentWorldFolder("");
+}
+
 void LevelScreen::initializeContent() {
     auto& content = controller->getLevel()->content;
     for (auto& entry : content.getPacks()) {
         initializePack(entry.second.get());
     }
-    scripting::on_frontend_init(hud.get(), worldRenderer.get());
+    scripting::on_frontend_init(hud.get(), renderer.get());
 }
 
 void LevelScreen::initializePack(ContentPackRuntime* pack) {
@@ -116,15 +133,22 @@ void LevelScreen::initializePack(ContentPackRuntime* pack) {
     }
 }
 
-LevelScreen::~LevelScreen() {
+void LevelScreen::loadDecorations() {
-    if (!controller->getLevel()->getWorld()->isNameless()) {
+    if (!io::exists(CLIENT_FILE)) {
-        saveWorldPreview();
+        return;
     }
-    scripting::on_frontend_close();
+    auto data = io::read_object(CLIENT_FILE);
-    // unblock all bindings
+    if (data.has("weather")) {
-    Events::enableBindings();
+        renderer->getWeather().deserialize(data["weather"]);
-    controller->onWorldQuit();
+    }
-    engine.getPaths().setCurrentWorldFolder("");
+}
+
+void LevelScreen::saveDecorations() {
+    io::create_directory("world:client");
+
+    auto data = dv::object();
+    data["weather"] = renderer->getWeather().serialize();
+    io::write_json(CLIENT_FILE, data, true);
 }
 
 void LevelScreen::saveWorldPreview() {
@@ -144,7 +168,7 @@ void LevelScreen::saveWorldPreview() {
         Viewport viewport(previewSize * 1.5, previewSize);
         DrawContext ctx(&pctx, viewport, batch.get());
         
-        worldRenderer->draw(ctx, camera, false, true, 0.0f, postProcessing.get());
+        renderer->draw(ctx, camera, false, true, 0.0f, *postProcessing);
         auto image = postProcessing->toImage();
         image->flipY();
         imageio::write("world:preview.png", image.get());
@@ -164,26 +188,15 @@ void LevelScreen::updateHotkeys() {
     if (Events::jpressed(keycode::F3)) {
         debug = !debug;
         hud->setDebug(debug);
-        worldRenderer->setDebug(debug);
+        renderer->setDebug(debug);
     }
 }
 
-void LevelScreen::update(float delta) {
+void LevelScreen::updateAudio() {
-    gui::GUI* gui = engine.getGUI();
-    auto menu = gui->getMenu();
-    
-    bool inputLocked = menu->hasOpenPage() ||
-                       hud->isInventoryOpen() || 
-                       gui->isFocusCaught();
-    if (!gui->isFocusCaught()) {
-        updateHotkeys();
-    }
-
-    auto level = controller->getLevel();
     auto player = playerController->getPlayer();
     auto camera = player->currentCamera;
-
     bool paused = hud->isPause();
+
     audio::get_channel("regular")->setPaused(paused);
     audio::get_channel("ambient")->setPaused(paused);
     glm::vec3 velocity {};
@@ -196,20 +209,34 @@ void LevelScreen::update(float delta) {
         camera->dir, 
         glm::vec3(0, 1, 0)
     );
-    const auto& settings = engine.getSettings();
-
-    if (!hud->isPause()) {
-        level->getWorld()->updateTimers(delta);
-        animator->update(delta);
 }
-    if (!hud->isPause()) {
+
+void LevelScreen::update(float delta) {
+    auto& gui = *engine.getGUI();
+    
+    if (!gui.isFocusCaught()) {
+        updateHotkeys();
+    }
+    updateAudio();
+    
+    auto menu = gui.getMenu();
+    bool inputLocked =
+        menu->hasOpenPage() || hud->isInventoryOpen() || gui.isFocusCaught();
+    bool paused = hud->isPause();
+    if (!paused) {
+        world.updateTimers(delta);
+        animator->update(delta);
         playerController->update(delta, !inputLocked);
     }
-    controller->update(glm::min(delta, 0.2f), hud->isPause());
+    controller->update(glm::min(delta, 0.2f), paused);
-    playerController->postUpdate(delta, !inputLocked, hud->isPause());
+    playerController->postUpdate(delta, !inputLocked, paused);
 
     hud->update(hudVisible);
-    decorator->update(delta, *camera);
+
+    const auto& weather = renderer->getWeather();
+    const auto& player = *playerController->getPlayer();
+    const auto& camera = *player.currentCamera;
+    decorator->update(paused ? 0.0f : delta, camera, weather);
 }
 
 void LevelScreen::draw(float delta) {
@@ -221,8 +248,8 @@ void LevelScreen::draw(float delta) {
     if (!hud->isPause()) {
         scripting::on_entities_render(engine.getTime().getDelta());
     }
-    worldRenderer->draw(
+    renderer->draw(
-        ctx, *camera, hudVisible, hud->isPause(), delta, postProcessing.get()
+        ctx, *camera, hudVisible, hud->isPause(), delta, *postProcessing
     );
 
     if (hudVisible) {
@@ -236,8 +263,3 @@ void LevelScreen::onEngineShutdown() {
     }
     controller->saveWorld();
 }
-
-LevelController* LevelScreen::getLevelController() const {
-    return controller.get();
-}
-

src/frontend/screens/LevelScreen.hpp

@@ -15,12 +15,14 @@ class PostProcessing;
 class ContentPackRuntime;
 class Decorator;
 class Level;
+class World;
 
 class LevelScreen : public Screen {
+    World& world;
     std::unique_ptr<LevelFrontend> frontend;
     std::unique_ptr<LevelController> controller;
     std::unique_ptr<PlayerController> playerController;
-    std::unique_ptr<WorldRenderer> worldRenderer;
+    std::unique_ptr<WorldRenderer> renderer;
     std::unique_ptr<TextureAnimator> animator;
     std::unique_ptr<PostProcessing> postProcessing;
     std::unique_ptr<Decorator> decorator;
@@ -33,6 +35,10 @@ class LevelScreen : public Screen {
     void updateHotkeys();
     void initializeContent();
     void initializePack(ContentPackRuntime* pack);
+
+    void loadDecorations();
+    void saveDecorations();
+    void updateAudio();
 public:
     LevelScreen(
         Engine& engine, std::unique_ptr<Level> level, int64_t localPlayer
@@ -43,6 +49,4 @@ public:
     void draw(float delta) override;
 
     void onEngineShutdown() override;
-
-    LevelController* getLevelController() const;
 };

src/graphics/render/Decorator.cpp

@@ -7,6 +7,7 @@
 #include "assets/assets_util.hpp"
 #include "content/Content.hpp"
 #include "voxels/Chunks.hpp"
+#include "voxels/Chunk.hpp"
 #include "voxels/Block.hpp"
 #include "world/Level.hpp"
 #include "window/Camera.hpp"
@@ -17,6 +18,8 @@
 #include "util/stringutil.hpp"
 #include "engine/Engine.hpp"
 #include "io/io.hpp"
+#include "audio/audio.hpp"
+#include "maths/util.hpp"
 
 namespace fs = std::filesystem;
 
@@ -80,8 +83,75 @@ void Decorator::addParticles(const Block& def, const glm::ivec3& pos) {
     }
 }
 
+void Decorator::updateRandom(
+    float delta,
+    const glm::ivec3& areaCenter,
+    const WeatherPreset& weather
+) {
+    util::PseudoRandom random(rand());
+
+    const auto& chunks = *player.chunks;
+    const auto& indices = *level.content.getIndices();
+    const auto& rainSplash = weather.fall.splash;
+
+    auto pos = areaCenter + glm::ivec3(
+        random.rand32() % 12,
+        random.rand32() % 12,
+        random.rand32() % 12
+    );
+    auto vox = chunks.get(pos);
+    auto chunk = chunks.getChunkByVoxel(pos);
+    if (vox == nullptr || chunk == nullptr) {
+        return;
+    }
+
+    const auto& def = indices.blocks.require(vox->id);
+    auto dst2 = util::distance2(pos, areaCenter);
+    if (!def.obstacle || dst2 >= 256 || weather.fall.noise.empty()) {
+        return;
+    }
+    for (int y = pos.y + 1; y < chunk->top; y++) {
+        if (indices.blocks.require(chunks.get(pos.x, y, pos.z)->id).obstacle) {
+            return;
+        }
+    }
+    float intensity = weather.intensity * weather.fall.maxIntensity;
+    if (rainSplash.has_value() && dst2 < 128 &&
+        random.randFloat() < glm::pow(intensity, 2.0f)) {
+        auto treg = util::get_texture_region(
+            assets, "particles:rain_splash_0", ""
+        );
+        renderer.particles->add(std::make_unique<Emitter>(
+            level,
+            glm::vec3 {
+                pos.x + random.randFloat(),
+                pos.y + 1.1,
+                pos.z + random.randFloat()},
+            *rainSplash,
+            treg.texture,
+            treg.region,
+            2
+        ));
+    }
+    if (random.rand() % 200 < 3 && pos.y < areaCenter.y + 1) {
+        auto sound = assets.get<audio::Sound>(weather.fall.noise);
+        audio::play(
+            sound,
+            pos,
+            false,
+            intensity * intensity,
+            1.0f,
+            false,
+            audio::PRIORITY_LOW,
+            audio::get_channel_index("ambient")
+        );
+    }
+}
+
 void Decorator::update(
-    float delta, const glm::ivec3& areaStart, const glm::ivec3& areaCenter
+    float delta,
+    const glm::ivec3& areaStart,
+    const glm::ivec3& areaCenter
 ) {
     int index = currentIndex;
     currentIndex = (currentIndex + BIG_PRIME) % UPDATE_BLOCKS;
@@ -93,7 +163,8 @@ void Decorator::update(
     int lz = (index / UPDATE_AREA_DIAMETER) % UPDATE_AREA_DIAMETER;
     int ly = (index / UPDATE_AREA_DIAMETER / UPDATE_AREA_DIAMETER);
     
-    auto pos = areaStart + glm::ivec3(lx, ly, lz);
+    glm::ivec3 offset {lx, ly, lz};
+    auto pos = areaStart + offset;
 
     if (auto vox = chunks.get(pos)) {
         const auto& def = indices.blocks.require(vox->id);
@@ -103,11 +174,7 @@ void Decorator::update(
     }
 }
 
-void Decorator::update(float delta, const Camera& camera) {
+void Decorator::updateBlockEmitters(const Camera& camera) {
-    glm::ivec3 pos = camera.position;
-    for (int i = 0; i < ITERATIONS; i++) {
-        update(delta, pos - glm::ivec3(UPDATE_AREA_DIAMETER / 2), pos);
-    }
     const auto& chunks = *player.chunks;
     const auto& indices = *level.content.getIndices();
     auto iter = blockEmitters.begin();
@@ -139,7 +206,9 @@ void Decorator::update(float delta, const Camera& camera) {
         }
         iter++;
     }
+}
 
+void Decorator::updateTextNotes() {
     for (const auto& [id, player] : *level.players) {
         if (id == this->player.getId() ||
             playerTexts.find(id) != playerTexts.end()) {
@@ -169,3 +238,47 @@ void Decorator::update(float delta, const Camera& camera) {
         }
     }
 }
+
+void Decorator::updateRandomSounds(float delta, const Weather& weather) {
+    thunderTimer += delta;
+    util::PseudoRandom random(rand());
+    if (thunderTimer >= 1.0f) {
+        thunderTimer = 0.0f;
+        if (random.randFloat() < weather.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")
+            );
+        }
+    }
+}
+
+void Decorator::update(
+    float delta,
+    const Camera& camera,
+    const Weather& weather
+) {
+    updateRandomSounds(delta, weather);    
+
+    glm::ivec3 pos = camera.position;
+    for (int i = 0; i < ITERATIONS; i++) {
+        update(delta, pos - glm::ivec3(UPDATE_AREA_DIAMETER / 2), pos);
+    }
+    int randIters = std::min(50'000, static_cast<int>(delta * 24'000));
+    for (int i = 0; i < randIters; i++) {
+        if (weather.a.intensity > 1.e-3f) {
+            updateRandom(delta, pos, weather.a);
+        }
+        if (weather.b.intensity > 1.e-3f) {
+            updateRandom(delta, pos, weather.b);
+        }
+    }
+    updateBlockEmitters(camera);
+    updateTextNotes();
+}

src/graphics/render/Decorator.hpp

@@ -18,6 +18,8 @@ class Block;
 class Engine;
 class LevelController;
 class WorldRenderer;
+class Weather;
+struct WeatherPreset;
 
 class Decorator {
     Engine& engine;
@@ -29,10 +31,23 @@ class Decorator {
     std::unordered_map<int64_t, u64id_t> playerTexts;
     int currentIndex = 0;
     NotePreset playerNamePreset {};
+    float thunderTimer = 0.0f;
 
     void update(
-        float delta, const glm::ivec3& areaStart, const glm::ivec3& areaCenter
+        float delta,
+        const glm::ivec3& areaStart,
+        const glm::ivec3& areaCenter
     );
+    
+    /// @brief Updates weather effects, blocks ambient sounds, etc..
+    void updateRandom(
+        float delta,
+        const glm::ivec3& areaCenter,
+        const WeatherPreset& weather
+    );
+    void updateRandomSounds(float delta, const Weather& weather);
+    void updateBlockEmitters(const Camera& camera);
+    void updateTextNotes();
     void addParticles(const Block& def, const glm::ivec3& pos);
 public:
     Decorator(
@@ -43,5 +58,9 @@ public:
         Player& player
     );
 
-    void update(float delta, const Camera& camera);
+    void update(
+        float delta,
+        const Camera& camera,
+        const Weather& weather
+    );
 };

src/graphics/render/ParticlesRenderer.cpp

@@ -6,10 +6,10 @@
 #include "assets/assets_util.hpp"
 #include "graphics/core/Shader.hpp"
 #include "graphics/core/Texture.hpp"
-#include "graphics/render/MainBatch.hpp"
 #include "window/Camera.hpp"
 #include "world/Level.hpp"
 #include "voxels/Chunks.hpp"
+#include "MainBatch.hpp"
 #include "settings.hpp"
 
 size_t ParticlesRenderer::visibleParticles = 0;
@@ -179,24 +179,6 @@ void ParticlesRenderer::render(const Camera& camera, float delta) {
     }
 }
 
-void ParticlesRenderer::gc() {
-    std::set<Emitter*> usedEmitters;
-    for (const auto& [_, vec] : particles) {
-        for (const auto& particle : vec) {
-            usedEmitters.insert(particle.emitter);
-        }
-    }
-    auto iter = emitters.begin();
-    while (iter != emitters.end()) {
-        auto emitter = iter->second.get();
-        if (usedEmitters.find(emitter) == usedEmitters.end()) {
-            iter = emitters.erase(iter);
-        } else {
-            iter++;
-        }
-    }
-}
-
 Emitter* ParticlesRenderer::getEmitter(u64id_t id) const {
     const auto& found = emitters.find(id);
     if (found == emitters.end()) {

src/graphics/render/ParticlesRenderer.hpp

@@ -40,12 +40,6 @@ public:
 
     u64id_t add(std::unique_ptr<Emitter> emitter);
 
-    /// @brief Perform garbage collection (remove extra dead emitters).
-    /// @note Emitters are deleting without GC when there's no particles with same
-    /// texture left.
-    /// @note Currently unused
-    void gc();
-
     /// @brief Get emitter by UID
     /// @return Emitter or nullptr
     Emitter* getEmitter(u64id_t id) const;

src/graphics/render/PrecipitationRenderer.cpp

@@ -0,0 +1,160 @@
+#include "PrecipitationRenderer.hpp"
+
+#include "MainBatch.hpp"
+#include "assets/Assets.hpp"
+#include "assets/assets_util.hpp"
+#include "graphics/core/Shader.hpp"
+#include "graphics/core/Texture.hpp"
+#include "lighting/Lightmap.hpp"
+#include "maths/util.hpp"
+#include "maths/voxmaths.hpp"
+#include "util/CentredMatrix.hpp"
+#include "settings.hpp"
+#include "presets/WeatherPreset.hpp"
+#include "voxels/Chunk.hpp"
+#include "voxels/Chunks.hpp"
+#include "window/Camera.hpp"
+#include "world/Level.hpp"
+
+PrecipitationRenderer::PrecipitationRenderer(
+    const Assets& assets,
+    const Level& level,
+    const Chunks& chunks,
+    const GraphicsSettings* settings
+)
+    : batch(std::make_unique<MainBatch>(4096)),
+      level(level),
+      chunks(chunks),
+      assets(assets),
+      settings(settings) {
+}
+
+PrecipitationRenderer::~PrecipitationRenderer() = default;
+
+int PrecipitationRenderer::getHeightAt(int x, int z) {
+    int y = CHUNK_H - 1;
+    int cx = floordiv<CHUNK_W>(x);
+    int cz = floordiv<CHUNK_D>(z);
+    auto chunk = chunks.getChunk(cx, cz);
+    if (chunk == nullptr) {
+        return y;
+    }
+    y = chunk->top;
+    x -= cx * CHUNK_W;
+    z -= cz * CHUNK_D;
+    while (y > 0) {
+        const auto& vox = chunk->voxels[vox_index(x, y, z)];
+        if (vox.id == 0) {
+            y--;
+            continue;
+        }
+        break;
+    }
+    return y;
+}
+
+static inline glm::vec4 light_at(const Chunks& chunks, int x, int y, int z) {
+    light_t lightval = chunks.getLight(x, y, z);
+    return glm::vec4(
+        Lightmap::extract(lightval, 0) / 15.f,
+        Lightmap::extract(lightval, 1) / 15.f,
+        Lightmap::extract(lightval, 2) / 15.f,
+        1
+    );
+}
+
+/// @brief 'Random' vertical texture coord offset to randomize rain layers
+static constexpr float K = 21.41149;
+/// @brief Precipitation face size
+static constexpr glm::ivec2 FACE_SIZE {1, 16};
+
+static UVRegion calc_uv(
+    const glm::vec3& pos,
+    const glm::vec3& right,
+    float timer,
+    const WeatherPreset& weather
+) {
+    static util::PseudoRandom random(0);
+
+    float scale = weather.fall.scale;
+
+    float m = glm::sign(right.x + right.z);
+    int ux = pos.x;
+    int uz = pos.z;
+    if (glm::abs(right.x) < glm::abs(right.z)) {
+        std::swap(ux, uz);
+    }
+    random.setSeed(uz);
+    float hspeed = (random.randFloat() * 2.0f - 1.0f) * weather.fall.hspeed;
+    float u1 = ux * scale + timer * hspeed * -m;
+    float v1 = timer * weather.fall.vspeed + pos.y * scale + uz * K;
+
+    return {u1, v1, u1 + m * scale, v1 + FACE_SIZE.y * scale};
+}
+
+void PrecipitationRenderer::render(
+    const Camera& camera, float delta, const WeatherPreset& weather
+) {
+    timer += delta;
+
+    const int radius = 6;
+    const int depth = 12;
+
+    int x = glm::floor(camera.position.x);
+    int y = glm::floor(camera.position.y);
+    int z = glm::floor(camera.position.z);
+
+    util::CentredMatrix<int, (depth + 1) * 2> heights;
+    heights.setCenter(x, z);
+    for (int z = heights.beginY(); z < heights.endY(); z++) {
+        for (int x = heights.beginX(); x < heights.endX(); x++) {
+            heights.at(x, z) = getHeightAt(x, z);
+        }
+    }
+
+    batch->begin();
+    auto& texture = assets.require<Texture>(weather.fall.texture);
+    texture.setMipMapping(false);
+    batch->setTexture(&texture, {});
+
+    const struct {
+        glm::vec3 right;
+        glm::vec3 front;
+    } faces[] {
+        {{-1, 0, 0}, {0, 0, 1}},
+        {{1, 0, 0}, {0, 0, -1}},
+        {{0, 0, -1}, {-1, 0, 0}},
+        {{0, 0, 1}, {1, 0, 0}},
+    };
+
+    bool cutBack = glm::dot(camera.up, glm::vec3(0, 1, 0)) > 0.35f * camera.getFov();
+    for (const auto& face : faces) {
+        if (glm::dot(camera.right, face.right) < 0.0f && cutBack) {
+            continue;
+        }
+        for (int lx = -radius; lx <= radius; lx++) {
+            for (int lz = depth; lz > 0; lz--) {
+                // Position calculations
+                glm::vec3 pos = face.right * static_cast<float>(lx) +
+                                face.front * static_cast<float>(lz);
+                pos += glm::vec3(x, 0, z);
+                pos.y =
+                    glm::max(y - FACE_SIZE.y / 2, heights.at(pos.x, pos.z)) +
+                    FACE_SIZE.y / 2 + 1;
+                pos += glm::vec3(0.5f, 0.0f, 0.5f);
+
+                // Draw
+                batch->quad(
+                    pos,
+                    face.right,
+                    {0, 1, 0},
+                    FACE_SIZE,
+                    light_at(chunks, pos.x, y, pos.z),
+                    glm::vec3(1.0f),
+                    calc_uv(pos, face.right, timer, weather)
+                );
+            }
+        }
+    }
+    batch->flush();
+}

src/graphics/render/PrecipitationRenderer.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "typedefs.hpp"
+
+class Level;
+class Assets;
+class Chunks;
+class Camera;
+class MainBatch;
+struct GraphicsSettings;
+struct WeatherPreset;
+
+class PrecipitationRenderer {
+    std::unique_ptr<MainBatch> batch;
+    const Level& level;
+    const Chunks& chunks;
+    const Assets& assets;
+    const GraphicsSettings* settings;
+    float timer = 0.0f;
+
+    int getHeightAt(int x, int z);
+public:
+    PrecipitationRenderer(
+        const Assets& assets,
+        const Level& level,
+        const Chunks& chunks,
+        const GraphicsSettings* settings
+    );
+
+    ~PrecipitationRenderer();
+
+    void render(const Camera& camera, float delta, const WeatherPreset& weather);
+};

src/graphics/render/WorldRenderer.cpp

@@ -44,6 +44,7 @@
 #include "graphics/core/Font.hpp"
 #include "BlockWrapsRenderer.hpp"
 #include "ParticlesRenderer.hpp"
+#include "PrecipitationRenderer.hpp"
 #include "TextsRenderer.hpp"
 #include "ChunksRenderer.hpp"
 #include "GuidesRenderer.hpp"
@@ -86,7 +87,10 @@ WorldRenderer::WorldRenderer(
       )),
       blockWraps(
           std::make_unique<BlockWrapsRenderer>(assets, level, *player.chunks)
-      ) {
+      ),
+      precipitation(std::make_unique<PrecipitationRenderer>(
+          assets, level, *player.chunks, &engine.getSettings().graphics
+      )) {
     auto& settings = engine.getSettings();
     level.events->listen(
         LevelEventType::CHUNK_HIDDEN,
@@ -115,6 +119,9 @@ void WorldRenderer::setupWorldShader(
     shader.uniform1f("u_gamma", settings.graphics.gamma.get());
     shader.uniform1f("u_fogFactor", fogFactor);
     shader.uniform1f("u_fogCurve", settings.graphics.fogCurve.get());
+    shader.uniform1f("u_weatherFogOpacity", weather.fogOpacity());
+    shader.uniform1f("u_weatherFogDencity", weather.fogDencity());
+    shader.uniform1f("u_weatherFogCurve", weather.fogCurve());
     shader.uniform1f("u_dayTime", level.getWorld()->getInfo().daytime);
     shader.uniform2f("u_lightDir", skybox->getLightDir());
     shader.uniform3f("u_cameraPos", camera.position);
@@ -160,6 +167,7 @@ void WorldRenderer::renderLevel(
     }
 
     entityShader.uniform1i("u_alphaClip", true);
+    entityShader.uniform1f("u_opacity", 1.0f);
     level.entities->render(
         assets,
         *modelBatch,
@@ -188,6 +196,21 @@ void WorldRenderer::renderLevel(
         scripting::on_frontend_render();
     }
 
+    setupWorldShader(entityShader, camera, settings, fogFactor);
+
+    std::array<const WeatherPreset*, 2> weatherInstances {&weather.a, &weather.b};
+    for (const auto& weather : weatherInstances) {
+        float maxIntensity = weather->fall.maxIntensity;
+        float zero = weather->fall.minOpacity;
+        float one = weather->fall.maxOpacity;
+        float t = (weather->intensity * (one - zero)) * maxIntensity + zero;
+        entityShader.uniform1i("u_alphaClip", weather->fall.opaque);
+        entityShader.uniform1f("u_opacity", weather->fall.opaque ? t * t : t);
+        if (weather->intensity > 1.e-3f && !weather->fall.texture.empty()) {
+            precipitation->render(camera, pause ? 0.0f : delta, *weather);
+        }
+    }
+
     skybox->unbind();
 }
 
@@ -306,36 +329,46 @@ void WorldRenderer::draw(
     Camera& camera,
     bool hudVisible,
     bool pause,
-    float delta,
+    float uiDelta,
-    PostProcessing* postProcessing
+    PostProcessing& postProcessing
 ) {
-    timer += delta * !pause;
+    float delta = uiDelta * !pause;
+    timer += delta;
+    weather.update(delta);
+
     auto world = level.getWorld();
+
     const Viewport& vp = pctx.getViewport();
     camera.aspect = vp.getWidth() / static_cast<float>(vp.getHeight());
 
     const auto& settings = engine.getSettings();
     const auto& worldInfo = world->getInfo();
     
-    skybox->refresh(pctx, worldInfo.daytime, 1.0f + worldInfo.fog * 2.0f, 4);
+    float sqrtT = glm::sqrt(weather.t);
+    float clouds = weather.b.clouds * sqrtT +
+                   weather.a.clouds * (1.0f - sqrtT);
+    clouds = glm::max(worldInfo.fog, clouds);
+    float mie = 1.0f + glm::max(worldInfo.fog, clouds * 0.5f) * 2.0f;
+
+    skybox->refresh(pctx, worldInfo.daytime, mie, 4);
 
     const auto& assets = *engine.getAssets();
     auto& linesShader = assets.require<Shader>("lines");
 
     /* World render scope with diegetic HUD included */ {
         DrawContext wctx = pctx.sub();
-        postProcessing->use(wctx);
+        postProcessing.use(wctx);
 
         Window::clearDepth();
 
         // Drawing background sky plane
-        skybox->draw(pctx, camera, assets, worldInfo.daytime, worldInfo.fog);
+        skybox->draw(pctx, camera, assets, worldInfo.daytime, clouds);
 
         /* Actually world render with depth buffer on */ {
             DrawContext ctx = wctx.sub();
             ctx.setDepthTest(true);
             ctx.setCullFace(true);
-            renderLevel(ctx, camera, settings, delta, pause, hudVisible);
+            renderLevel(ctx, camera, settings, uiDelta, pause, hudVisible);
             // Debug lines
             if (hudVisible) {
                 if (debug) {
@@ -344,7 +377,7 @@ void WorldRenderer::draw(
                     );
                 }
                 if (player.currentCamera == player.fpCamera) {
-                    renderHands(camera, delta * !pause);
+                    renderHands(camera, delta);
                 }
             }
         }
@@ -355,12 +388,12 @@ void WorldRenderer::draw(
         renderBlockOverlay(wctx);
     }
 
-    // Rendering fullscreen quad with
+    // Rendering fullscreen quad
     auto screenShader = assets.get<Shader>("screen");
     screenShader->use();
     screenShader->uniform1f("u_timer", timer);
     screenShader->uniform1f("u_dayTime", worldInfo.daytime);
-    postProcessing->render(pctx, screenShader);
+    postProcessing.render(pctx, screenShader);
 }
 
 void WorldRenderer::renderBlockOverlay(const DrawContext& wctx) {
@@ -414,3 +447,7 @@ void WorldRenderer::clear() {
 void WorldRenderer::setDebug(bool flag) {
     debug = flag;
 }
+
+Weather& WorldRenderer::getWeather() {
+    return weather;
+}

src/graphics/render/WorldRenderer.hpp

@@ -10,6 +10,9 @@
 
 #include "typedefs.hpp"
 
+#include "presets/WeatherPreset.hpp"
+#include "world/Weather.hpp"
+
 class Level;
 class Player;
 class Camera;
@@ -18,6 +21,7 @@ class LineBatch;
 class ChunksRenderer;
 class ParticlesRenderer;
 class BlockWrapsRenderer;
+class PrecipitationRenderer;
 class GuidesRenderer;
 class TextsRenderer;
 class Shader;
@@ -43,6 +47,7 @@ class WorldRenderer {
     std::unique_ptr<GuidesRenderer> guides;
     std::unique_ptr<Skybox> skybox;
     std::unique_ptr<ModelBatch> modelBatch;
+    Weather weather {};
     
     float timer = 0.0f;
     bool debug = false;
@@ -71,6 +76,7 @@ public:
     std::unique_ptr<TextsRenderer> texts;
     std::unique_ptr<ParticlesRenderer> particles;
     std::unique_ptr<BlockWrapsRenderer> blockWraps;
+    std::unique_ptr<PrecipitationRenderer> precipitation;
 
     static bool showChunkBorders;
     static bool showEntitiesDebug;
@@ -84,7 +90,7 @@ public:
         bool hudVisible,
         bool pause,
         float delta,
-        PostProcessing* postProcessing
+        PostProcessing& postProcessing
     );
 
     /// @brief Render level without diegetic interface
@@ -103,4 +109,6 @@ public:
     void clear();
 
     void setDebug(bool flag);
+
+    Weather& getWeather();
 };

src/interfaces/Serializable.hpp

@@ -9,4 +9,10 @@ public:
     virtual ~Serializable() {}
     virtual dv::value serialize() const = 0;
     virtual void deserialize(const dv::value& src) = 0;
+
+    void deserializeOpt(const dv::optionalvalue& opt) {
+        if (opt.ptr) {
+            deserialize(*opt.ptr);
+        }
+    }
 };

src/logic/scripting/lua/libs/api_lua.hpp

@@ -46,6 +46,7 @@ extern const luaL_Reg utf8lib[];
 extern const luaL_Reg vec2lib[];  // vecn.cpp
 extern const luaL_Reg vec3lib[];  // vecn.cpp
 extern const luaL_Reg vec4lib[];  // vecn.cpp
+extern const luaL_Reg weatherlib[];
 extern const luaL_Reg worldlib[];
 
 // Components

src/logic/scripting/lua/libs/libweather.cpp

@@ -0,0 +1,68 @@
+#include "libhud.hpp"
+
+#include "world/Level.hpp"
+#include "world/World.hpp"
+
+using namespace scripting;
+
+static Weather& require_weather() {
+    if (level == nullptr) {
+        throw std::runtime_error("world is not open");
+    }
+    return renderer->getWeather();
+}
+
+static int l_change(lua::State* L) {
+    WeatherPreset preset {};
+    preset.deserialize(lua::tovalue(L, 1));
+    float time = lua::tonumber(L, 2);
+    std::string name;
+    if (lua::isstring(L, 3)) {
+        name = lua::tostring(L, 3);
+    }
+    auto& weather = require_weather();
+    weather.change(std::move(preset), time, std::move(name));
+    return 0;
+}
+
+static int l_get_current(lua::State* L) {
+    const auto& weather = require_weather();
+    if (weather.t > 0.5f) {
+        return lua::pushstring(L, weather.nameB);
+    } else {
+        return lua::pushstring(L, weather.nameA);
+    }
+}
+
+static int l_get_fall_intensity(lua::State* L) {
+    auto& weather = require_weather();
+    const auto& a = weather.a;
+    const auto& b = weather.b;
+    float t = weather.t;
+    return lua::pushnumber(L, 
+        (a.fall.texture.empty() ? 0.0f : (1.0f - t)) +
+        (b.fall.texture.empty() ? 0.0f : t)
+    );
+}
+
+static int l_get_current_data(lua::State* L) {
+    auto& weather = require_weather();
+    if (weather.t > 0.5f) {
+        return lua::pushvalue(L, weather.b.serialize());
+    } else {
+        return lua::pushvalue(L, weather.a.serialize());
+    }
+}
+
+static int l_is_transition(lua::State* L) {
+    return lua::pushboolean(L, require_weather().t < 1.0f);
+}
+
+const luaL_Reg weatherlib[] = {
+    {"change", lua::wrap<l_change>},
+    {"get_current", lua::wrap<l_get_current>},
+    {"get_current_data", lua::wrap<l_get_current_data>},
+    {"get_fall_intensity", lua::wrap<l_get_fall_intensity>},
+    {"is_transition", lua::wrap<l_is_transition>},
+    {NULL, NULL}
+};

src/logic/scripting/scripting_hud.cpp

@@ -35,6 +35,7 @@ void scripting::on_frontend_init(Hud* hud, WorldRenderer* renderer) {
     lua::openlib(L, "hud", hudlib);
     lua::openlib(L, "gfx", "blockwraps", blockwrapslib);
     lua::openlib(L, "gfx", "particles", particleslib);
+    lua::openlib(L, "gfx", "weather", weatherlib);
     lua::openlib(L, "gfx", "text3d", text3dlib);
 
     load_script("hud_classes.lua");

src/maths/util.hpp

@@ -20,6 +20,8 @@ namespace util {
     class PseudoRandom {
         unsigned short seed;
     public:
+        PseudoRandom(unsigned short seed) : seed(seed) {}
+
         PseudoRandom() {
             seed = static_cast<unsigned short>(time(0));
         }

src/presets/WeatherPreset.cpp

@@ -0,0 +1,56 @@
+#include "WeatherPreset.hpp"
+
+#include "data/dv_util.hpp"
+
+dv::value WeatherPreset::serialize() const {
+    auto root = dv::object();
+    
+    auto froot = dv::object();
+    froot["texture"] = fall.texture;
+    froot["vspeed"] = fall.vspeed;
+    froot["hspeed"] = fall.hspeed;
+    froot["scale"] = fall.scale;
+    froot["noise"] = fall.noise;
+    froot["min_opacity"] = fall.minOpacity;
+    froot["max_opacity"] = fall.maxOpacity;
+    froot["max_intensity"] = fall.maxIntensity;
+    froot["opaque"] = fall.opaque;
+    if (fall.splash) {
+        froot["splash"] = fall.splash->serialize();
+    }
+    root["fall"] = froot;
+
+    root["fog_opacity"] = fogOpacity;
+    root["fog_dencity"] = fogDencity;
+    root["fog_curve"] = fogCurve;
+    root["clouds"] = clouds;
+    root["thunder_rate"] = thunderRate;
+
+    return root;
+}
+
+void WeatherPreset::deserialize(const dv::value& src) {
+    if (src.has("fall")) {
+        const auto& froot = src["fall"];
+        froot.at("texture").get(fall.texture);
+        froot.at("vspeed").get(fall.vspeed);
+        froot.at("hspeed").get(fall.hspeed);
+        froot.at("scale").get(fall.scale);
+        froot.at("noise").get(fall.noise);
+        froot.at("min_opacity").get(fall.minOpacity);
+        froot.at("max_opacity").get(fall.maxOpacity);
+        froot.at("max_intensity").get(fall.maxIntensity);
+        froot.at("opaque").get(fall.opaque);
+        
+        if (froot.has("splash")) {
+            const auto& sroot = froot["splash"];
+            fall.splash = ParticlesPreset {};
+            fall.splash->deserialize(sroot);
+        }
+    }
+    src.at("fog_opacity").get(fogOpacity);
+    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

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <optional>
+
+#include "interfaces/Serializable.hpp"
+
+#include "ParticlesPreset.hpp"
+
+struct WeatherPreset : Serializable {
+    struct {
+        /// @brief Precipitation texture
+        std::string texture;
+        
+        /// @brief Fall sound
+        std::string noise;
+
+        /// @brief Vertical speed
+        float vspeed = 1.0f;
+
+        /// @brief Max horizontal speed
+        float hspeed = 0.1f;
+
+        /// @brief UV scaling
+        float scale = 0.1f;
+
+        /// @brief Fall opacity interpreted as zero.
+        /// @example if 0.8 then opacity range is 0.8-max for 0.0-1.0 intensity
+        float minOpacity = 0.0f;
+
+        /// @brief Fall opacity interpreted as one.
+        /// @example if 0.8 then opacity range is min-0.8 for 0.0-1.0 intensity
+        float maxOpacity = 1.0f;
+
+        /// @brief Max fall intencity 
+        /// (influences opacity, noise volume and splashes frequency)
+        float maxIntensity = 1.0f;
+
+        /// @brief Clip texture by alpha channel
+        bool opaque = false;
+
+        /// @brief Fall splash
+        std::optional<ParticlesPreset> splash;
+    } fall {};
+
+    /// @brief Max weather fog opacity
+    float fogOpacity = 0.0f;
+
+    /// @brief Weather fog depth multiplier
+    float fogDencity = 1.0f;
+
+    /// @brief Weather fog curve
+    float fogCurve = 1.0f;
+
+    /// @brief Clouds opacity
+    float clouds = 0.0f;
+    
+    /// @brief Thunder rate in range 0.0-1.0 (1.0 is 100% - every second)
+    float thunderRate = 0.0f;
+    
+    /// @brief Weather effects intensity
+    float intensity = 1.0f;
+
+    dv::value serialize() const override;
+    void deserialize(const dv::value& src) override;
+};

src/util/CentredMatrix.hpp

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <array>
+#include <stdexcept>
+
+namespace util {
+    template<typename T, int diameter, typename CoordT = int>
+    class CentredMatrix {
+    public:
+        static constexpr CoordT radius = diameter / 2;
+
+        CentredMatrix() {}
+
+        void setCenter(CoordT x, CoordT y) {
+            centerX = x;
+            centerY = y;
+        }
+
+        T& at(CoordT x, CoordT y) {
+            x -= centerX - (diameter - radius);
+            y -= centerY - (diameter - radius);
+            if (x < 0 || y < 0 || x >= diameter || y >= diameter) {
+                throw std::invalid_argument("position is out if matrix");
+            }
+            return arr.at(y * diameter + x);
+        }
+
+        auto begin() {
+            return arr.begin();
+        }
+
+        auto end() {
+            return arr.end();
+        }
+
+        CoordT beginX() const {
+            return centerX - (diameter - radius);
+        }
+
+        CoordT beginY() const {
+            return centerY - (diameter - radius);
+        }
+
+        CoordT endX() const {
+            return centerX + radius;
+        }
+        
+        CoordT endY() const {
+            return centerY + radius;
+        }
+    private:
+        std::array<T, diameter * diameter> arr;
+        CoordT centerX = 0, centerY = 0;
+    };
+}

src/world/Weather.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <string>
+
+#include "presets/WeatherPreset.hpp"
+
+struct Weather : Serializable {
+    WeatherPreset a {};
+    WeatherPreset b {};
+    std::string nameA;
+    std::string nameB;
+    float t = 1.0f;
+    float speed = 0.0f;
+
+    void update(float delta) {
+        t += delta * speed;
+        t = std::min(t, 1.0f);
+        b.intensity = t;
+        a.intensity = 1.0f - t;
+    }
+
+    void change(WeatherPreset preset, float time, std::string name="") {
+        std::swap(a, b);
+        std::swap(nameA, nameB);
+        b = std::move(preset);
+        t = 0.0f;
+        speed = 1.0f / std::max(time, 1.e-5f);
+        nameB = std::move(name);
+        update(0.0f);
+    }
+
+    float fogOpacity() const {
+        return b.fogOpacity * t + a.fogOpacity * (1.0f - t);
+    }
+
+    float fogDencity() const {
+        return b.fogDencity * t + a.fogDencity * (1.0f - t);
+    }
+
+    float fogCurve() const {
+        return b.fogCurve * t + a.fogCurve * (1.0f - t);
+    }
+
+    float thunderRate() const {
+        return b.thunderRate * t + a.thunderRate * (1.0f - t);
+    }
+
+    dv::value serialize() const override {
+        return dv::object({
+            {"a", a.serialize()},
+            {"b", b.serialize()},
+            {"name-a", nameA},
+            {"name-b", nameB},
+            {"t", t},
+            {"speed", speed},
+        });
+    }
+
+    void deserialize(const dv::value& src) override {
+        a.deserializeOpt(src.at("a"));
+        b.deserializeOpt(src.at("b"));
+        src.at("name-a").get(nameA);
+        src.at("name-b").get(nameB);
+        src.at("t").get(t);
+        src.at("speed").get(speed);
+    }
+};

src/world/World.cpp

@@ -231,8 +231,8 @@ dv::value WorldInfo::serialize() const {
     timeobj["day-time-speed"] = daytimeSpeed;
     timeobj["total-time"] = totalTime;
 
-    auto& weatherobj = root.object("weather");
+    root["weather"] = dv::object();
-    weatherobj["fog"] = fog;
+    root["weather"]["fog"] = fog;
 
     root["next-inventory-id"] = nextInventoryId;
     root["next-entity-id"] = nextEntityId;

src/world/World.hpp

@@ -4,9 +4,9 @@
 #include <string>
 #include <vector>
 
-#include "io/fwd.hpp"
 #include "content/ContentPack.hpp"
 #include "interfaces/Serializable.hpp"
+#include "io/fwd.hpp"
 #include "typedefs.hpp"
 #include "util/timeutil.hpp"
 
@@ -33,7 +33,6 @@ struct WorldInfo : public Serializable {
     /// 0.5 - is noon
     float daytime = timeutil::time_value(10, 00, 00);
 
-    // looking bad
     float daytimeSpeed = 1.0f;
 
     /// @brief total time passed in the world (not depending on daytimeSpeed)