uniform sampler2D visibility;
uniform sampler2D shape;
uniform float uTime;
uniform float glitch;
uniform vec3 pulseColor;
uniform vec3 glitchColor;

varying vec3 vColor;
varying vec3 vDeltaPosition;
varying vec2 vUv;
varying float vBackfacing;

void main() {

  vec2 uv = vUv;
  vec3 color = vColor;
  float time = uTime * 0.0002;

  // Remove backfacing dots
  if (floor(vBackfacing + 0.1) == 0.0)
    discard;

  //   Remove ocean dots
  if (length(texture2D(visibility, uv).rgb) > 1.0)
    discard;

  // Make points circular
  if (texture2D(shape, gl_PointCoord).a < 0.0625)
    discard;

  // GLitch effect
  vec3 glitch = color * gln_rand(uv + time * 0.01) + 0.3;
  vec3 normalColor =
      color * gln_normalize(gln_simplex((vec3(uv + time, 1.0) * 1000.0))) + 0.3;

  color = mix(normalColor, glitch, glitch);

  // Pulse effect
  float dx = vDeltaPosition.x;
  float dy = vDeltaPosition.y;
  float dz = vDeltaPosition.z;
  float dist = sqrt(dx * dx + dy * dy + dz * dz) * 10.0;
  //   vec3 pulseColor = vec3(0.953, 0.545, 0.627);

  color = mix(color, pulseColor, dist);

  gl_FragColor = vec4(color, 1.0);
}