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uniform sampler2D tInput;
uniform vec2 center;
uniform float strength;
uniform vec2 resolution;
varying vec2 vUv;
float random(vec3 scale,float seed){return fract(sin(dot(gl_FragCoord.xyz+seed,scale))*43758.5453+seed);}
void main(){
vec4 color=vec4(0.0);
float total=0.0;
vec2 toCenter=center-vUv*resolution;
float offset=random(vec3(12.9898,78.233,151.7182),0.0);
for(float t=0.0;t<=40.0;t++){
float percent=(t+offset)/40.0;
float weight=4.0*(percent-percent*percent);
vec4 sample=texture2D(tInput,vUv+toCenter*percent*strength/resolution);
sample.rgb*=sample.a;
color+=sample*weight;
total+=weight;
}
gl_FragColor=color/total;
gl_FragColor.rgb/=gl_FragColor.a+0.00001;
}