Blur Shader

shader_type canvas_item;
void fragment()
{
    float Pi = 6.28318530718; // Pi*2

    // GAUSSIAN BLUR SETTINGS {{{
    float Directions = 16.0; // BLUR DIRECTIONS (Default 16.0 - More is better but slower)
    float Quality = 4.0; // BLUR QUALITY (Default 4.0 - More is better but slower)
    float Size = 20.0; // BLUR SIZE (Radius)
    // GAUSSIAN BLUR SETTINGS }}}

    vec2 Radius = Size/(1.0 / SCREEN_PIXEL_SIZE).xy;

    // Normalized pixel coordinates (from 0 to 1)
    vec2 uv = FRAGCOORD.xy/(1.0 / SCREEN_PIXEL_SIZE).xy;
    // Pixel colour
    vec4 Color = texture(SCREEN_TEXTURE, uv);

    // Blur calculations
    for( float d=0.0; d<Pi; d+=Pi/Directions)
    {
        for(float i=1.0/Quality; i<=1.0; i+=1.0/Quality)
        {
            Color += texture(SCREEN_TEXTURE, uv+vec2(cos(d),sin(d))*Radius*i);
        }
    }

    // Output to screen
    Color /= Quality * Directions - 15.0;
    Color.r/=1.5;
    Color.g/=1.5;
    Color.b/=1.5;
    COLOR =  Color;
}