add weather intensity (WIP)

res/shaders/entity.glslv

@@ -15,6 +15,7 @@ uniform mat4 u_proj;
 uniform mat4 u_view;
 uniform vec3 u_cameraPos;
 uniform float u_gamma;
+uniform float u_opacity;
 uniform samplerCube u_cubemap;
 
 uniform vec3 u_torchlightColor;
@@ -36,6 +37,7 @@ 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_color.a = u_opacity;
     a_distance = length(u_view * u_model * vec4(pos3d * FOG_POS_SCALE, 0.0));
     gl_Position = u_proj * u_view * modelpos;
 }

src/graphics/render/Decorator.cpp

@@ -115,7 +115,7 @@ void Decorator::updateRandom(
             return;
         }
     }
-    if (dst2 < 128 && rainSplash.has_value()) {
+    if (dst2 < 128 && random.randFloat() < glm::pow(weather.intensity, 2.0f) && rainSplash.has_value()) {
         auto treg = util::get_texture_region(
             assets, "particles:rain_splash_0", ""
         );
@@ -131,13 +131,13 @@ void Decorator::updateRandom(
             2
         ));
     }
-    if (random.rand() % 200 < 2 && pos.y < areaCenter.y + 1) {
+    if (random.rand() % 200 < 3 && pos.y < areaCenter.y + 1) {
         auto sound = assets.get<audio::Sound>(weather.fall.noise);
         audio::play(
             sound,
             pos,
             false,
-            1.0f,
+            weather.intensity * weather.intensity,
             1.0f,
             false,
             audio::PRIORITY_LOW,

src/graphics/render/WorldRenderer.cpp

@@ -136,8 +136,8 @@ 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", 0.8f);
+    shader.uniform1f("u_weatherFogOpacity", weather.fogOpacity * weather.intensity);
-    shader.uniform1f("u_weatherFogDencity", 2.0f);
+    shader.uniform1f("u_weatherFogDencity", weather.fogDencity);
     shader.uniform1f("u_dayTime", level.getWorld()->getInfo().daytime);
     shader.uniform2f("u_lightDir", skybox->getLightDir());
     shader.uniform3f("u_cameraPos", camera.position);
@@ -183,6 +183,7 @@ void WorldRenderer::renderLevel(
     }
 
     entityShader.uniform1i("u_alphaClip", true);
+    entityShader.uniform1f("u_opacity", 1.0f);
     level.entities->render(
         assets,
         *modelBatch,
@@ -213,7 +214,10 @@ void WorldRenderer::renderLevel(
 
     setupWorldShader(entityShader, camera, settings, fogFactor);
     entityShader.uniform1i("u_alphaClip", false);
+    float zero = weather.fall.minOpacity;
+    entityShader.uniform1f("u_opacity", (weather.intensity * (1.0f - zero)) + zero);
     precipitation->render(camera, pause ? 0.0f : delta, weather);
+    weather.intensity = -glm::cos(timer * 0.2f) * 0.5f + 0.5f;
 
     skybox->unbind();
 }
@@ -344,7 +348,13 @@ void WorldRenderer::draw(
     const auto& settings = engine.getSettings();
     const auto& worldInfo = world->getInfo();
 
-    skybox->refresh(pctx, worldInfo.daytime, 1.0f + worldInfo.fog * 2.0f, 4);
+    skybox->refresh(
+        pctx,
+        worldInfo.daytime,
+        1.0f +
+            glm::max(worldInfo.fog, weather.clouds * glm::sqrt(weather.intensity) * 0.5f) * 2.0f,
+        4
+    );
 
     const auto& assets = *engine.getAssets();
     auto& linesShader = assets.require<Shader>("lines");

src/presets/WeatherPreset.cpp

@@ -12,6 +12,9 @@ dv::value WeatherPreset::serialize() const {
     froot["scale"] = fall.scale;
     froot["noise"] = fall.noise;
     root["fall"] = froot;
+    root["fog_opacity"] = fogOpacity;
+    root["fog_dencity"] = fogDencity;
+    root["clouds"] = clouds;
 
     return root;
 }
@@ -24,5 +27,8 @@ void WeatherPreset::deserialize(const dv::value& src) {
         froot.at("hspeed").get(fall.hspeed);
         froot.at("scale").get(fall.scale);
         froot.at("noise").get(fall.noise);
+        src.at("fog_opacity").get(fogOpacity);
+        src.at("fog_dencity").get(fogDencity);
+        src.at("clouds").get(clouds);
     }
 }

src/presets/WeatherPreset.hpp

@@ -18,10 +18,24 @@ struct WeatherPreset : Serializable {
         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 0.8-1.0 for 0.0-1.0 intensity
+        float minOpacity = 0.8f;
         /// @brief Fall splash
         std::optional<ParticlesPreset> splash;
     } fall {};
 
+    /// @brief Max weather fog opacity
+    float fogOpacity = 0.8f;
+
+    /// @brief Weather fog depth multiplier
+    float fogDencity = 2.0f;
+
+    float clouds = 0.5f;
+
+    /// @brief Weather effects intensity
+    float intensity = 0.9f;
+
     dv::value serialize() const override;
     void deserialize(const dv::value& src) override;
 };