Added missing shaders

project/assets/shader/shader_vignette.gdshader

@@ -0,0 +1,17 @@
+shader_type canvas_item;
+
+uniform float inner_radius = 0.1;
+uniform float outer_radius = 1;
+uniform float vignette_strength = 1.0;
+uniform float dither_strength = 0.03;
+uniform vec4 vignette_color: source_color;
+
+
+void fragment() {
+	float dist = distance(UV, vec2(0.5));
+	
+	float vignette = smoothstep(inner_radius, outer_radius, dist) * vignette_strength;
+	float dither = fract(sin(dot(UV, vec2(12.9898, 78.233))) * 43758.5453123) * dither_strength;
+	
+	COLOR = vec4(vignette_color.rgb, vignette + dither);
+}

project/assets/shader/shader_vignette.tres

@@ -0,0 +1,11 @@
+[gd_resource type="ShaderMaterial" load_steps=2 format=3 uid="uid://ckg3be082ny3h"]
+
+[ext_resource type="Shader" path="res://assets/shader/shader_vignette.gdshader" id="1_6o5k2"]
+
+[resource]
+shader = ExtResource("1_6o5k2")
+shader_parameter/inner_radius = 0.1
+shader_parameter/outer_radius = 0.725
+shader_parameter/vignette_strength = 0.0
+shader_parameter/dither_strength = 0.03
+shader_parameter/vignette_color = Color(0, 0, 0, 1)