/* This is free and unencumbered software released into the public
   domain. To the extent possible under law, the author of this file
   waives all copyright and related or neighboring rights to it.
*/

precision mediump float;

attribute vec3 position;
attribute vec2 texCoord;
attribute vec4 color;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

uniform float cut;
uniform float range;

varying vec4 fColor;

void main(void) {
    gl_Position = projection * view * model * vec4(position, 1.0);
    vec2 n = vec2(texCoord.x, cut);
    float p = 1.0 - range * abs(snoise(n));
    fColor = vec4(p * color.rgb, color.a);
}