Anamorphic Lens Flare

Great, now your game looks like a J.J Abrams movie.

Usage:

Apply this shader on a full screen quad: https://docs.godotengine.org/en/stable/tutorials/shaders/advanced_postprocessing.html#full-screen-quad

Support me: https://www.paypal.me/vinrato

Shader code

shader_type spatial;
render_mode unshaded, blend_add;

#define SAMPLES 10

uniform sampler2D ST : hint_screen_texture, filter_nearest, repeat_enable;
uniform float threshold = 1.0;
uniform float lower_threshold = 0.75;
uniform float intensity = 0.08;
uniform vec4 flare_color : source_color = vec4(0.482, 0.003, 0.917, 1.0);
uniform float width : hint_range(0.0, 0.1, 0.001) = 0.04;

const float weights[20] = {
	.3, .45, .53, .65, .78, .87, .90, .93, .96, 1.0,
	1.0, .96, .93, .90, .87, .78, .65, .53, .45, .3
};

float rand(vec2 n) {
	return fract(sin(dot(n, vec2(12.9898, 4.1414)) * TIME) * 43758.5453);
}

void vertex() {
	POSITION = vec4(VERTEX.xy, 1.0, 1.0);
}

void fragment() {
	vec4 screen;
	vec4 sum = vec4(0.0);
	float lum;
	float mask;
	int idx = 0;
	for (int i = -SAMPLES; i < SAMPLES; i ++) {
		screen = texture(ST, SCREEN_UV + vec2(float(i) * width * rand(SCREEN_UV), 0.0));
		lum = dot(vec3(0.30, 0.59, 0.11), screen.rgb);
		mask = smoothstep(lower_threshold, threshold, lum);
		sum += flare_color * mask * weights[idx];
		idx++;
	}
	ALBEDO = sum.rgb * intensity;
}

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