GLSL Snippets - Touchdesigner

// Example Pixel Shader 02/14/2020
 
 // uniform float exampleUniform;
 
 out vec4 fragColor;
 uniform vec2 uRes;
 uniform float osc;
 uniform float speed;
 vec3 red = vec3(235,12,38);
 float PI = 3.1415926;
 vec3 pink = vec3 (1.,.1,.35);
 
 
 float draw_heart (vec2 _st, float CX, float CY, float speed){
  _st.x *= .75;
  _st.y -=sqrt(abs(_st.x))*.4 - .05;
  float d = length(_st - vec2 (CX, CY)) - speed *.001;
  return d;
 }
 
 
 float draw_square (float CX, float CY, float Height,float Width,float blr, vec2 _st){
  vec2 Center = vec2(CX,CY);
  float disY =smoothstep(CY - Height/2.0-blr,CY - Height/2.0+blr,_st.t) - smoothstep(CY + Height/2.0 -blr,CY + Height/2.0 + blr,_st.t);
  float disX =smoothstep(CX - Width/2.0 - blr,CX - Width/2.0 + blr,_st.s) - smoothstep(CX + Width/2.0 - blr, CX + Width/2.0 + blr,_st.s);
  float Square = disY * disX;
  return Square;
 }
 
 
 vec2 rotate2d(vec2 _st, float _angle){
  _st = _st - .5;
  _st = mat2(cos(_angle),-sin(_angle),
  sin(_angle),cos(_angle)) * _st;
  //_st -= .5;
  return _st;
 }
 
 
 vec2 canvas (vec2 _st, float amplifier){
  _st = _st * amplifier;
 // offset and animate rows
  _st.x += step(1., mod(_st.y,2.))*.5 *osc;
  _st.y -= step(0., mod(_st.y,2.))*.5 *osc;
 // change aspect ratio
  _st /= vec2(1.,1.);
  _st = fract(_st);
  return _st;
 }
 
 
 void main()
 {;
  vec2 st = vec2(vUV);
 
  float myheart = fract(draw_heart(st-.5, .0,.0,speed)*4);
 
  vec2 aspect = uRes/uRes.x;
  st = st * aspect;
  st = canvas (st,10.);
  st = rotate2d (st, -PI /4.);
 
 
  float square1 = draw_square(-.2,.3,.5,.5,.007,st);
  float square2 = draw_square(-.2,.4,.1,.1,.007,st);
 
  float square = square1 - square2;
 
 
 
  vec4 outsquare = vec4(.0-vec3 (square)+pink,.0);
  vec4 outheart = vec4(vec3(myheart,.0,.05)+(1.-vec3 (myheart)),1.);
 
  vec4 compose = outsquare + outheart;
 
  vec4 color = compose;
  fragColor = TDOutputSwizzle(color);
 }
 

//updated 20210115 by Jiajing Qi
 uniform float osc; //Add osc to glsl Vectors in Touchdesigner
 
 out vec4 fragColor;
 
 
 float draw_Circle(float CX,float CY,float Radius, float blr){
  vec2 Center = vec2(CX,CY);
  float Circle = smoothstep (Radius/2 - blr, Radius/2 + blr, length(vUV.st - vec2(CX,CY)));
  return Circle;
 }
 void main()
 {
  float r = abs(sin(vUV.y*9.+ osc));
  float myCircle = draw_Circle(.5,.5,r,.9);
  vec4 color = vec4(vec3(myCircle),1.);
  fragColor = TDOutputSwizzle(color);
 }