//- Noisetex By AirLoocke42 OpenGL Modified In Github, Copyright To AirLoocke42 -//

//- http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/2397517-1-8-1-6-airloocke42-shader-1-8-1-6-13-950 -//

precision mediump float;

uniform float time;

float mat(float n) { return fract(sin(n)*43758.5453); }

float noise(vec2 x){
    vec2 p = floor(x), f = fract(x);
    float iRes = 512.0, n = p.x + p.y*iRes;
    return mix(mix(mat(n-1.0), mat(n),f.x), mix(mat(n+(iRes-1.0)), mat(n+iRes),f.x),f.y);
}

void main( void ) {
    float pn = 0.0, freq = 1.0, amp = 1.0;
	
    for (int i = 0; i < 5; i++) {
    pn += noise((gl_FragCoord.xy/40.0)*freq + time * 0.3)*amp; 
    freq *= 2.1; amp *= 0.5;
    }	  
    pn = pn - 0.7;

    gl_FragColor = vec4(pn);
}

//- http://glslsandbox.com/e#27281.0 -//