precision mediump float;
uniform sampler2D uTexture;
uniform float uTextureFrequency;
uniform float u_time;
uniform float uHslTimeFrequency;
uniform float uHslHue;
uniform float uHslHueOffset;
uniform float uHslHueFrequency; 
uniform float uHslLightness; 
uniform float uHslLightnessVariation; 
uniform float uHslLightnessFrequency; 
uniform float uTextureOffset; 

precision mediump float;
varying vec2 v_texcoord;
uniform float u_time;
uniform float uFrequency;
uniform float uAmplitude;

float random(vec2 st) {
    return fract(sin(dot(st.xy, vec2(12.9898, 78.233))) * 43758.5453123);
}

//	Classic Perlin 2D Noise 
//	by Stefan Gustavson
//
vec2 fade(vec2 t) {

precision mediump float;
uniform vec3 uColor;
uniform float uOffset;
uniform float uMultiplier;


varying vec2 v_texcoord;

void main(){
    float distanceToCenter = smoothstep(0.0, 1.0,length(v_texcoord - 0.5));
    float alpha = distanceToCenter * uMultiplier + uOffset;
    gl_FragColor = vec4(uColor, alpha);
}