Variable Blur – Works with parallax layers

Modified blur shader that can be used inside parallax background, just add a texture rect with the shader and ajust the values.

You can add more than one layer of blur to make a 2D depth of field.

Shader code
shader_type canvas_item;

uniform float SAMPLES = 11.0;
const float WIDTH = 0.04734573810584494679397346954847;

uniform vec2 blur_scale = vec2(1, 0);

float gaussian(float x) {
    float x_squared = x*x;

    return WIDTH * exp((x_squared / (2.0 * SAMPLES)) * -1.0);
}

void fragment() {
	vec2 scale = TEXTURE_PIXEL_SIZE * blur_scale;
	
	float weight = 0.0;
	float total_weight = 0.0;
	vec4 color = vec4(0.0);
	
	for(int i=-int(SAMPLES)/2; i < int(SAMPLES)/2; ++i) {
		weight = gaussian(float(i));
		color.rgb += texture(SCREEN_TEXTURE, SCREEN_UV + scale * vec2(float(i))).rgb * weight;
		total_weight += weight;
	}
	
	COLOR.rgb = color.rgb / total_weight;
}
Tags
blur, depth, parallax
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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