Distorted Android

void deform(in int effect, inout vec4 v)

  {

  vec2 force = vUniforms[effect].xy;    // force = vec(MM')

  vec2 vert_vec, horz_vec; 

  vec2 signXY = sign(center-v.xy);

void distort(in int effect, inout vec4 v, inout vec4 n)

  {

  vec2 ps = center-v.xy;

  vec3 force = vUniforms[effect].xyz;

  float d = degree(vUniforms[effect+2],center,ps);

void sink(in int effect,inout vec4 v)

  {

  vec2 ps = center-v.xy;

  float h = vUniforms[effect].x;

  float t = degree(vUniforms[effect+2],center,ps) * (1.0-h)/max(1.0,h);

void swirl(in int effect, inout vec4 v)

  {

  vec2 PS = center-v.xy;

  vec4 SO = vUniforms[effect+2];

  float d1_circle = degree_region(SO,PS);

void wave(in int effect, inout vec4 v, inout vec4 n)

  {

  float amplitude = vUniforms[effect  ].x;

  float length    = vUniforms[effect  ].y;