#version 120

attribute vec4 vColor;
attribute float vSize;
attribute vec4 vPosition;

varying vec4   color;

uniform float time = 1;

void main() {
    float scaleDot;

    scaleDot = time + vSize;
    if (scaleDot > 1.0) {
        scaleDot = time - vSize;
    }

    scaleDot = clamp(scaleDot, 0.0, 1.0);
    gl_PointSize =  8*scaleDot;


    gl_Position =  vPosition;
    color = vec4(vColor.rgb, 1.0);

    return;
}