add blur - fog - dust

Scenes/Blur.gdshader

@@ -0,0 +1,17 @@
+shader_type canvas_item;
+
+// Cattura tutto quello che c'è sotto questo nodo
+uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
+
+uniform float blur_amount : hint_range(0.0, 5.0) = 2.5; 
+uniform float focus_size : hint_range(0.0, 1.0) = 0.4;  
+uniform float transition_softness : hint_range(0.01, 1.0) = 0.3; 
+
+void fragment() {
+    float dist_from_center = abs(SCREEN_UV.y - 0.5);
+    float mask = smoothstep(focus_size / 2.0, (focus_size / 2.0) + transition_softness, dist_from_center);
+    
+    // Applica il blur
+    vec4 blurred_screen = textureLod(screen_texture, SCREEN_UV, blur_amount * mask);
+    COLOR = blurred_screen;
+}