Wobbly shader

adds a customizable wobble effect around the texture

Shader code

shader_type canvas_item;

uniform float alpha_tresh : hint_range(0.0, 1.0, 0.01) = 0.8;
uniform float shrink = 2.0;
uniform float offset_mul = 2.0;
uniform float coff_angle = 0.0;
uniform float coff_mul = 0.5;
uniform float coff_std:hint_range(0.0, 3.0, 0.1) = 0.2;
uniform float amp1 = 0.125;
uniform float freq1 = 4;
uniform float speed1 = 5.0;
uniform float amp2 = 0.125;
uniform float freq2 = 9;
uniform float speed2 = 1.46;
uniform sampler2D cols;
uniform sampler2D base_offset;

void vertex() {
	UV *= shrink;
	UV -= vec2((shrink-1.0)/2.0);
}

void fragment() {
	if (COLOR.a <= alpha_tresh) {
	float angle = atan(UV.y-0.5, UV.x-0.5);
	if (angle < 0.0) {
	angle += 2.0 * PI;
	}
	float h = amp1*sin(angle*freq1 + TIME*speed1) + amp2*sin(angle*freq2 + TIME*speed2);
	h += amp1+amp2;
	float b_off = texture(base_offset, vec2(1.0-angle/(2.0*PI),0)).r;
	h += b_off*offset_mul;
	float c_diff1 = angle-mod(coff_angle,2.0*PI);
	float c_diff = min(min(abs(c_diff1),abs(c_diff1-2.0*PI)),abs(c_diff1+2.0*PI));
	float c_off = exp(-c_diff*c_diff/(2.0*coff_std*coff_std));
	h += c_off*coff_mul;
	h /= 2.0*(amp1+amp2) + offset_mul;
	//h = clamp(h, 0.0, 1.0);
	float r = length(vec2(UV.x-0.5,UV.y-0.5))*2.0/shrink;
	if (r < h) {
		COLOR = texture(cols, vec2(r/h));
	}else{
		COLOR = vec4(0.0,0.0,0.0,0.0);
	}
	}
}