weather change test

res/presets/weather/snow.json

@@ -10,5 +10,6 @@
     },
     "fog_opacity": 0.8,
     "fog_dencity": 2.5,
+    "fog_curve": 0.5,
     "clouds": 0.5
 }

src/frontend/screens/LevelScreen.cpp

@@ -210,7 +210,10 @@ void LevelScreen::update(float delta) {
 
     hud->update(hudVisible);
     decorator->update(
-        hud->isPause() ? 0.0f : delta, *camera, worldRenderer->weatherInstances.at(0)
+        hud->isPause() ? 0.0f : delta,
+        *camera,
+        worldRenderer->weather.a,
+        worldRenderer->weather.b
     );
 }
 

src/graphics/render/Decorator.cpp

@@ -173,7 +173,10 @@ void Decorator::update(
 }
 
 void Decorator::update(
-    float delta, const Camera& camera, const WeatherPreset& weather
+    float delta,
+    const Camera& camera,
+    const WeatherPreset& weatherA,
+    const WeatherPreset& weatherB
 ) {
     glm::ivec3 pos = camera.position;
     for (int i = 0; i < ITERATIONS; i++) {
@@ -181,7 +184,12 @@ void Decorator::update(
     }
     int randIters = std::min(50'000, static_cast<int>(delta * 24'000));
     for (int i = 0; i < randIters; i++) {
-        updateRandom(delta, pos, weather);
+        if (weatherA.intensity > 1.e-3f) {
+            updateRandom(delta, pos, weatherA);
+        }
+        if (weatherB.intensity > 1.e-3f) {
+            updateRandom(delta, pos, weatherB);
+        }
     }
     const auto& chunks = *player.chunks;
     const auto& indices = *level.content.getIndices();

src/graphics/render/Decorator.hpp

@@ -53,5 +53,10 @@ public:
         Player& player
     );
 
-    void update(float delta, const Camera& camera, const WeatherPreset& weather);
+    void update(
+        float delta,
+        const Camera& camera,
+        const WeatherPreset& weatherA,
+        const WeatherPreset& weatherB
+    );
 };

src/graphics/render/WorldRenderer.cpp

@@ -101,16 +101,6 @@ WorldRenderer::WorldRenderer(
         settings.graphics.skyboxResolution.get(),
         assets->require<Shader>("skybox_gen")
     );
-
-    WeatherPreset weather = {};
-    weather.deserialize(io::read_json("res:presets/weather/rain.json"));
-    weather.intensity = 0.5f;
-    weatherInstances.push_back(std::move(weather));
-
-    weather = {};
-    weather.deserialize(io::read_json("res:presets/weather/snow.json"));
-    weather.intensity = 0.5f;
-    weatherInstances.push_back(std::move(weather));
 }
 
 WorldRenderer::~WorldRenderer() = default;
@@ -129,18 +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());
-
-    float fog_opacity = 0.0f;
-    float fog_dencity = 0.0f;
-    float fog_curve = 0.0f;
-    for (const auto& weather : weatherInstances) {
-        fog_opacity += weather.fogOpacity * weather.intensity;
-        fog_dencity += weather.fogDencity * weather.intensity;
-        fog_curve += weather.fogCurve * weather.intensity;
-    }
-    shader.uniform1f("u_weatherFogOpacity", fog_opacity);
-    shader.uniform1f("u_weatherFogDencity", fog_dencity);
-    shader.uniform1f("u_weatherFogCurve", fog_curve);
+    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);
@@ -171,6 +152,24 @@ void WorldRenderer::renderLevel(
     bool pause,
     bool hudVisible
 ) {
+    weather.update(delta);
+
+    if (timer > 1.0f && weather.b.fall.texture.empty() && timer < 2.0f) {
+        weather.b.deserialize(io::read_json("res:presets/weather/snow.json"));
+        weather.t = 0.0f;
+        weather.speed = 0.5f;
+        weather.update(delta);
+    }
+
+    if (timer > 15.0f && weather.a.fall.texture.empty()) {
+        std::swap(weather.a, weather.b);
+        weather.b = {};
+        weather.b.deserialize(io::read_json("res:presets/weather/fog.json"));
+        weather.t = 0.0f;
+        weather.speed = 0.1f;
+        weather.update(delta);
+    }
+
     texts->render(ctx, camera, settings, hudVisible, false);
 
     bool culling = engine.getSettings().graphics.frustumCulling.get();
@@ -217,13 +216,15 @@ void WorldRenderer::renderLevel(
 
     setupWorldShader(entityShader, camera, settings, fogFactor);
 
+    std::array<WeatherPreset*, 2> weatherInstances {&weather.a, &weather.b};
     for (const auto& weather : weatherInstances) {
-        float zero = weather.fall.minOpacity;
-        float one = weather.fall.maxOpacity;
-        entityShader.uniform1i("u_alphaClip", weather.fall.opaque);
-        entityShader.uniform1f("u_opacity", (weather.intensity * (one - zero)) + zero);
-        if (weather.intensity > 1.e-3f && !weather.fall.texture.empty()) {
-            precipitation->render(camera, pause ? 0.0f : delta, weather);
+        float zero = weather->fall.minOpacity;
+        float one = weather->fall.maxOpacity;
+        float t = (weather->intensity * (one - zero)) + 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);
         }
     }
 
@@ -355,10 +356,8 @@ void WorldRenderer::draw(
 
     const auto& settings = engine.getSettings();
     const auto& worldInfo = world->getInfo();
-    float clouds = 0.0f;
-    for (const auto& weather : weatherInstances) {
-        clouds += weather.clouds * glm::sqrt(weather.intensity);
-    }
+    float clouds = weather.b.clouds * glm::sqrt(weather.t) +
+                   weather.a.clouds * glm::sqrt(1.0f - weather.t);
     clouds = glm::max(worldInfo.fog, clouds);
     float mie = 1.0f + glm::max(worldInfo.fog, clouds * 0.5f) * 2.0f;
 

src/graphics/render/WorldRenderer.hpp

@@ -34,6 +34,32 @@ class ModelBatch;
 class Assets;
 struct EngineSettings;
 
+struct Weather {
+    WeatherPreset a {};
+    WeatherPreset b {};
+    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;
+    }
+
+    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);
+    }
+};
+
 class WorldRenderer {
     Engine& engine;
     const Level& level;
@@ -75,7 +101,7 @@ public:
     std::unique_ptr<ParticlesRenderer> particles;
     std::unique_ptr<BlockWrapsRenderer> blockWraps;
     std::unique_ptr<PrecipitationRenderer> precipitation;
-    std::vector<WeatherPreset> weatherInstances;
+    Weather weather {};
 
     static bool showChunkBorders;
     static bool showEntitiesDebug;

src/presets/WeatherPreset.hpp

@@ -28,15 +28,15 @@ struct WeatherPreset : Serializable {
     } fall {};
 
     /// @brief Max weather fog opacity
-    float fogOpacity = 0.8f;
+    float fogOpacity = 0.0f;
 
     /// @brief Weather fog depth multiplier
-    float fogDencity = 2.0f;
+    float fogDencity = 1.0f;
 
     /// @brief Weather fog curve
-    float fogCurve = 0.5f;
+    float fogCurve = 1.0f;
 
-    float clouds = 0.5f;
+    float clouds = 0.0f;
 
     /// @brief Weather effects intensity
     float intensity = 1.0f;