precision mediump float;

#endif

​

varying vec2 vTexCoord;

​

uniform sampler2D texture;

uniform float noise;

​

void main() {

  vec2 uv = vTexCoord;

  uv.y = 1.0 - uv.y;

  vec2 offset = vec2(noise * 0.05, 0.0);

  vec3 col;

  col.r = texture2D(texture, uv + offset).r;

  col.g = texture2D(texture, uv).g;

  col.b = texture2D(texture, uv - offset).b;

  gl_FragColor = vec4(col, 1.0);

}