Blur

Ported from GLSL shaders by kiwipxl

To use

• Add ColorRect to your Node2d or Control
• Set Anchor preset to full rect and add
• Set Material in Inspector to ShaderMaterial and load the Shader

Shader code

shader_type canvas_item;

uniform sampler2D t0 : hint_screen_texture;
uniform vec2 blur_size = vec2(.5, .5);

void fragment() {
    vec2 size = vec2(textureSize(t0, 0));

    float uv_x = float(SCREEN_UV.x) * size.x;
    float uv_y = float(SCREEN_UV.y) * size.y;

    vec4 sum = vec4(0.0);
    for (int n = 0; n < 9; ++n) {
        uv_y = float(SCREEN_UV.y) * size.y + (blur_size.y * (float(n) - 4.5));
        vec4 h_sum = vec4(0.0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) - int(4.0 * blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) - int(3.0 * blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) - int(2.0 * blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) - int(blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) + int(blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) + int(2.0 * blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) + int(3.0 * blur_size.x), int(uv_y)), 0);
        h_sum += texelFetch(t0, ivec2(int(uv_x) + int(4.0 * blur_size.x), int(uv_y)), 0);
        sum += h_sum / 9.0;
    }

    COLOR = sum / 9.0;
}

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