update main shader

res/shaders/main.glslf

@@ -1,20 +1,18 @@
 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 +22,6 @@ void main() {
         if (alpha < 0.002f)
             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/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 +15,10 @@ 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 samplerCube u_cubemap;
 
 uniform vec3 u_torchlightColor;
@@ -35,6 +40,10 @@ 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(depth * u_weatherFogDencity, u_weatherFogOpacity)));
     gl_Position = u_proj * u_view * modelpos;
 }

src/graphics/render/PrecipitationRenderer.cpp

@@ -97,6 +97,7 @@ void PrecipitationRenderer::render(const Camera& camera, float delta) {
 
     WeatherPreset weather {};
     auto& fall = weather.fall;
+    fall.vspeed = 2.0f;
     fall.texture = "misc/rain";
 
     const int radius = 6;

src/graphics/render/WorldRenderer.cpp

@@ -119,6 +119,8 @@ 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_weatherFogDencity", 2.0f);
     shader.uniform1f("u_dayTime", level.getWorld()->getInfo().daytime);
     shader.uniform2f("u_lightDir", skybox->getLightDir());
     shader.uniform3f("u_cameraPos", camera.position);