precision mediump float;

#endif

​

uniform vec2 u_resolution;

uniform float u_time;

uniform vec2 u_mouse;

uniform sampler2D u_img;

​

void main() {

  vec2 coord = gl_FragCoord.xy / u_resolution;

  // coord.x += sin(u_time);

  gl_FragColor = texture2D(u_img, coord);

}