fix snow

core/daynight/water_ripple.gdshader

@@ -3,6 +3,12 @@ render_mode blend_mix, depth_draw_always;
 
 global uniform float global_rain_intensity;
 global uniform vec4 global_water_color = vec4(0.285, 0.534, 0.487, 1.0);
+global uniform float global_snow_start_time = -1.0;
+global uniform float global_snow_accumulation_speed = 0.005;
+global uniform float global_snow_melt_time = -1.0;
+global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
+global uniform vec4 global_snow_color = vec4(0.92, 0.96, 1.0, 1.0);
 
 //Water color
 uniform vec4 deep_water_color : source_color = vec4(0.0, 0.1, 0.2, 1.0);
@@ -29,6 +35,21 @@ uniform sampler2D depth_texture : hint_depth_texture, filter_linear_mipmap;
 varying vec2 world_pos_xz;
 varying vec2 local_uv;
 
+float get_snow_progress() {
+	float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
+
+	if (global_snow_start_time >= 0.0) {
+		float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+		snow_progress = max(snow_progress, timed_progress);
+	}
+	if (global_snow_melt_time >= 0.0) {
+		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+		snow_progress = min(snow_progress, 1.0 - melt);
+	}
+
+	return snow_progress;
+}
+
 void vertex() {
 	world_pos_xz = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xz;
 	local_uv = UV;
@@ -82,8 +103,15 @@ void fragment() {
 	float is_sky = step(ref_depth_raw, 0.00001); // Protezione anti-cielo
 	reflection_mask *= (1.0 - is_sky);
 
-	vec3 final_rgb = mix(base_water.rgb, screen_ref, reflection_strength * reflection_mask);
+	float snow_progress = get_snow_progress();
+	float active_snowfall = step(0.0, global_snow_start_time) * (1.0 - step(0.0, global_snow_melt_time));
+	float reflection_snow_damping = max(smoothstep(0.0, 0.08, snow_progress), active_snowfall * 0.75);
+	float effective_reflection_strength = reflection_strength * (1.0 - reflection_snow_damping * 0.85);
+
+	vec3 final_rgb = mix(base_water.rgb, screen_ref, effective_reflection_strength * reflection_mask);
 	final_rgb = mix(final_rgb, ripple_color.rgb, ring * ripple_color.a);
+	float water_snow_amount = smoothstep(0.15, 1.0, snow_progress) * 0.18;
+	final_rgb = mix(final_rgb, global_snow_color.rgb, water_snow_amount);
 
 	ALBEDO = final_rgb;