#version 120

varying vec4 color;
varying vec4 texcoord;
varying vec4 lmcoord;

attribute vec4 mc_Entity;

uniform float frameTimeCounter;

void main() {

  texcoord = gl_TextureMatrix[0] * gl_MultiTexCoord0;

  //Uniform random direction using equal-area projection
  float noisep = clamp(fract(sin(dot(gl_Vertex ,vec4(12.9898f,78.233f,16.5f,0.0f))) * 43758.5453f),0.0f,1.0f)*6.2831853f;
  float noisez = clamp(fract(sin(dot(gl_Vertex, vec4(16.5f, 12.9898f,78.233f,0.0f))) * 43758.5453f),0.0f,1.0f)*2.0f-1.0f;
  float k = sqrt(1-noisez*noisez);
  vec4 dir = vec4(k*cos(noisep), k*sin(noisep), noisez, 0.0f);

  //Box-Muller method to generate normal variates
  float noise3 = clamp(fract(sin(dot(gl_Vertex, vec4(12.9898f,16.5f, 78.233f,0.0f))) * 43758.5453f),0.0f,1.0f);
  float noise4 = clamp(fract(sin(dot(gl_Vertex, vec4(16.6f, 16.6f,16.6f,0.0f))) * 43758.5453f),0.0f,1.0f);
  float normv = sqrt(-2.0f * log(noise3)) * sin(6.2831853f*noise4);
  float scale = clamp(normv*0.33f,-1.0f,1.0f)*0.8; //increase last number for greater effect

  vec4 position = gl_ModelViewMatrix * (gl_Vertex + dir*scale);

  gl_Position = gl_ProjectionMatrix * position; //Update position of matrix

  color = gl_Color;

  lmcoord = gl_TextureMatrix[1] * gl_MultiTexCoord1;

  gl_FogFragCoord = gl_Position.z;
}