#version 120
// (C) 2009 Dmytry Lavrov. All rights reserved.
varying vec3 delta;
varying vec2 txpos_f;
uniform float t;

vec3 AmpColor(float a){
    return pow(vec3(cos(a+4.1)*0.5+0.5, cos(a+2.05)*0.5+0.5, cos(a)*0.5+0.5),vec3(5.0));
}

void main (void)
{

    float period=400;
    float tt=mod(t-txpos_f.x,period);
    float br=1.0+0.5/(0.01+tt*0.1);
    br*=1.0-tt/period;
    vec3 col=(20.0*AmpColor(0.534563*(-t*2.23463456-txpos_f.x))+vec3(1.0))*br;

    //float q=br/length(delta);
    float q=1.0/length(delta);

    gl_FragColor = vec4(gl_Color.rgb*col*q, 1.0);//vec4(0.1, 0.1, 0.1, 1.0);
}