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;

  vec3 color = vec3(0.0);

  vec4 image = texture2D(u_img, coord);

  image.r += 0.9;

​

  color = mix(color, image.rgb, image.a);

  color.r += 0.7;

  gl_FragColor = vec4(color, 1.0);

}