add fog_curve parameter & update shaders

res/presets/weather/rain.json

@@ -16,5 +16,6 @@
     },
     "fog_opacity": 0.8,
     "fog_dencity": 2.0,
+    "fog_curve": 0.5,
     "clouds": 0.5
 }

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 : 0.15f))
         discard;
-    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), 
-              min(1.0, pow(depth*u_fogFactor, u_fogCurve)));
+    f_color = mix(a_color * tex_color, vec4(fogColor,1.0), a_fog);
     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;
@@ -16,6 +16,11 @@ 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;
@@ -38,6 +43,10 @@ void main() {
     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));
+
+    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

@@ -1,13 +1,11 @@
 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 bool u_alphaClip;
 
 void main() {

res/shaders/main.glslv

@@ -19,6 +19,8 @@ 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;
@@ -44,6 +46,6 @@ void main() {
     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(depth * u_weatherFogDencity, u_weatherFogOpacity)));
+                         min(pow(depth * u_weatherFogDencity, u_weatherFogCurve), u_weatherFogOpacity)));
     gl_Position = u_proj * u_view * modelpos;
 }

src/graphics/render/WorldRenderer.cpp

@@ -103,21 +103,7 @@ WorldRenderer::WorldRenderer(
     );
 
     weather = {};
-    auto& fall = weather.fall;
-    fall.vspeed = 2.0f;
-    fall.texture = "misc/rain";
-    fall.noise = "ambient/rain";
-
-    ParticlesPreset rainSplash;
-    rainSplash.frames = {
-        "particles:rain_splash_0",
-        "particles:rain_splash_1",
-        "particles:rain_splash_2"
-    };
-    rainSplash.lifetime = 0.2f;
-    rainSplash.spawnInterval = 0.0f;
-    rainSplash.size = {0.2f, 0.2f, 0.2f};
-    fall.splash = std::move(rainSplash);
+    weather.deserialize(io::read_json("res:presets/weather/rain.json"));
 }
 
 WorldRenderer::~WorldRenderer() = default;
@@ -138,6 +124,7 @@ void WorldRenderer::setupWorldShader(
     shader.uniform1f("u_fogCurve", settings.graphics.fogCurve.get());
     shader.uniform1f("u_weatherFogOpacity", weather.fogOpacity * weather.intensity);
     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);
@@ -216,8 +203,10 @@ void WorldRenderer::renderLevel(
     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;
+    if (weather.intensity > 1.e-3f && !weather.fall.texture.empty()) {
+        precipitation->render(camera, pause ? 0.0f : delta, weather);
+    }
+    //weather.intensity = -glm::cos(timer * 0.2f) * 0.5f + 0.5f;
 
     skybox->unbind();
 }

src/presets/WeatherPreset.cpp

@@ -18,6 +18,7 @@ dv::value WeatherPreset::serialize() const {
 
     root["fog_opacity"] = fogOpacity;
     root["fog_dencity"] = fogDencity;
+    root["fog_curve"] = fogCurve;
     root["clouds"] = clouds;
 
     return root;
@@ -40,5 +41,6 @@ void WeatherPreset::deserialize(const dv::value& src) {
     }
     src.at("fog_opacity").get(fogOpacity);
     src.at("fog_dencity").get(fogDencity);
+    src.at("fog_curve").get(fogCurve);
     src.at("clouds").get(clouds);
 }

src/presets/WeatherPreset.hpp

@@ -31,10 +31,13 @@ struct WeatherPreset : Serializable {
     /// @brief Weather fog depth multiplier
     float fogDencity = 2.0f;
 
+    /// @brief Weather fog curve
+    float fogCurve = 0.5f;
+
     float clouds = 0.5f;
 
     /// @brief Weather effects intensity
-    float intensity = 0.9f;
+    float intensity = 1.0f;
 
     dv::value serialize() const override;
     void deserialize(const dv::value& src) override;