Simple Blur Shader

shader_type canvas_item;

uniform float blur_amount : hint_range(0.0, 5.0);
uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;

void fragment() {
    // Samples the screen texture using the LOD (Level of Detail)
    // provided by the blur_amount
    vec4 color = textureLod(screen_texture, SCREEN_UV, blur_amount);
    COLOR = color;
}