Add 2018-04-07

2018-04-07/.vedarc

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+{
+  "IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 1,
+  "audio": true,
+  "camera": true,
+  "keyboard": false,
+  "midi": false,
+}

2018-04-07/01-elie.frag

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+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+vec3 circle(vec2 uv, vec2 pos,float r, float s){
+vec3 res = vec3 (smoothstep(r,r+s,length(uv-pos)));
+return res;
+}
+
+void main () {
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    vec2 uv0 = uv;
+
+    uv.x += sin(uv.y) / uv.y * exp(sin(time * 0.3)) * 0.5;
+    uv.y += sin(uv.x) / uv.x * 0.1;
+
+    uv -= .5;
+    uv.x *= resolution.x / resolution.y;
+    float a = atan(uv.y, uv.x),
+      d = length(uv);
+    a=a/6.2831+.5;
+    d-=time*.1;
+
+    float a0 = a + fract(d);
+    float r1 = sin(time) + sin(a * 31.4);
+    float r2 = sin(time + 3.14) + sin(a0 * 31.4 + 1.51 * pow(sin(time + a0 * 32.), 2.));
+    float r3 = sin(time + 3.14) + sin(-a0 * 31.4 + 1.51 * pow(sin(-time - a0 * 32.), 2.));
+    vec3 c1 = circle (uv0.xy, vec2(0.5,0.5),r1,0.35);
+    vec3 c2 = circle (uv0.xy, vec2(0.5,0.5),r2,0.5);
+    vec3 c3 = circle (uv0.xy, vec2(0.5,0.5),r3,0.5);
+    c1-=c2;
+
+    vec3 color = texture2D(camera, vec2(a, fract(d))).rgb;
+    vec3 color2 = texture2D(camera, vec2(a, fract(d)) * 2.).rgb;
+
+    //color -= color2 * 0.5;
+
+    color.x*=1./(c1.x);
+    color.y *= 1./c2.x;
+    color.b *= c3.r;
+
+    //color -= color2 * 2.;
+
+    gl_FragColor = vec4(color,1.);
+}

2018-04-07/02-koltes.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 1.5,
+  "audio": true,
+  "camera": true,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+struct D {
+  float d;
+  vec3 c;
+  float m;
+};
+
+D map(vec3 p){
+  p.xy *= rot(time * .3 + p.z * .01);
+  p.yz *= rot(time * .5);
+  float rp=4. + sin(time) * 2.;
+  vec3 idx=floor((p+rp)/rp/2.);
+  p = mod(p + rp, 2.*rp) - rp;
+
+  p.xy *= rot(time * sin(idx.x));
+  p.yz *= rot(time * sin(idx.y));
+
+  D d;
+  float r = mix(.8,1.,smoothstep(-1.,1.,p.y)-.5);
+  d.d= length(p.xz) - r;
+  d.d = max(d.d, abs(p.y)-1.5);
+  float a=(atan(p.z,p.x)/6.2831+.5)*2.;
+  vec4 logo = texture2D(guinness, vec2(a, p.y * 1.));
+  logo.rgb=mix(logo.rgb, 1.-logo.rgb, 1.-length(logo.rgb));
+  vec3 blk=mix(vec3(.1), logo.rgb, logo.a);
+  d.c=mix(blk,vec3(1),step(1.2,p.y));
+
+  d.m = mix(.01, .05, step(0., length(p.xz) - r - .2));
+  return d;
+}
+
+vec3 pal(float t, vec3 a, vec3 b, vec3 c, vec3 d){
+  return a+b*cos(6.2831*(c*t+d));
+}
+
+void main () {
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    uv -= .5;
+    uv.x *= resolution.x / resolution.y;
+
+    vec3 ro=vec3(0,0,-8),
+      rd=normalize(vec3(uv,1.-length(uv*.5))),
+      mp=ro + rd * 6.;
+    float ff;
+    D d;
+    vec3 c;
+    for (float f=0.;f<50.;f+=1.){
+      ff = f;
+      d=map(mp);
+      if (abs(d.d)<.001)break;
+      if (d.d<.5)
+      c += d.c;
+      mp+=max(d.d, d.m)*rd;
+    }
+    c *= .05;
+    //c *= 1. - ff/50.;
+    vec3 green = pal(time*.2 - length(uv), vec3(.2, .8, .3), vec3(.2), vec3(1., 3., 2.), vec3(0.));
+    //c = mix(green, c, 1.-smoothstep(45., 49., ff));
+    gl_FragColor = vec4(c,1);
+  }

2018-04-07/03-elie.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 1,
+  "audio": true,
+  "camera": false,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+struct D {
+  float d;
+  vec3 c;
+};
+
+D map(vec3 p){
+  p.xy *= rot(time * .3 + p.z * .01);
+  p.yz *= rot(time * .5);
+  D d;
+  d.d= length(p.xz) - 0.5;
+  d.c=vec3(1);
+
+  float t = time * 0.01;
+  float t2 = time * 1.;
+  p.yz *= sin(exp((sin(t2) * sin(t2) + sin(t2 * 1.41) * sin(t2 * 1.41)) * 0.5) * 0.2 * p.x);
+
+  for (float z = 0. ; z < 5. ; z += 1.) {
+    float c = cos(t + 0.1 + z * 0.2);
+    float s = sin(t + 0.1 + z * 0.2);
+    p.xy *= mat2(c, s, -s, c);
+    d.d = min(d.d, length(p.yz) - 0.5);
+  }
+
+
+  return d;
+}
+
+vec3 pal(float t, vec3 a, vec3 b, vec3 c, vec3 d){
+  return a+b*cos(6.2831*(c*t+d));
+}
+
+void main () {
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    uv -= .5;
+    uv.x *= resolution.x / resolution.y;
+
+    vec3 ro=vec3(0,0,-8),
+      rd=normalize(vec3(uv,1.-length(uv*.5))),
+      mp=ro + rd * 6.;
+    float ff;
+    D d;
+    vec3 c;
+    for (float f=0.;f<50.;f+=1.){
+      ff = f;
+      d=map(mp);
+      if (abs(d.d)<.001)break;
+      if (d.d<.5)
+      c += d.c;
+      mp+=d.d*rd;
+    }
+    c *= .05;
+
+    vec3 b = vec3(1.0);
+    float tt = step(mod(time * 10., 5.), 4.);
+    float ttt = step(mod(time * 5., 5.), 4.);
+    b = mix(vec3(1.0, ttt / 5., 0.0), b, 0.8 + tt * 0.1);
+    c = pal(ff/30., vec3(1.0), b, vec3(0.5, 0.3, 0.1), vec3(0.5));
+
+    //c *= mix(c, 1. - c, pow(normalize(length(c)), 0.2));
+    c *= mix(c, 1. - c, c.g * 3.);
+
+    gl_FragColor = vec4(c,1);
+  }

2018-04-07/04-elie.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 1,
+  "audio": true,
+  "camera": false,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+vec3 pal(float t, vec3 a, vec3 b, vec3 c, vec3 d){
+  return a+b*cos(6.2831*(c*t+d));
+}
+
+void main () {
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    //uv -= .5;
+    //
+    uv.x *= resolution.x / resolution.y;
+
+    float d = length(uv - vec2(0.5, 0.5));
+
+
+    uv.x += sin(2. * time + uv.x * 10.) * sin(exp(sin(time * 1. + uv.x * 10.)) + uv.y * 10.);
+
+    vec3 c = vec3(uv, 0.);
+
+    c *= 1. - step(d, .05);
+
+    gl_FragColor = vec4(c,1);
+  }

2018-04-07/05-adrian.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 1,
+  "audio": true,
+  "camera": false,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+vec3 pal(float t, vec3 a, vec3 b, vec3 c, vec3 d){
+  return a+b*cos(6.2831*(c*t+d));
+}
+
+void main () {
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    //uv -= .5;
+    //
+    float width = resolution.x / resolution.y;
+    uv.x *= resolution.x / resolution.y;
+
+    //float xCircle = vec2((0.5+0.5*sin(1.*time)) * width * 0.5;
+    //
+    float timeOffset = 0.;
+    float minDist = 10000.;
+    for (int i = 0; i < 40; i += 1)
+    {
+      timeOffset += 0.024;
+      vec2 happy = vec2((0.5+0.2*sin(2.7*(time+timeOffset))) * width, (0.5+0.2*cos(0.2+1.9*(time+timeOffset))));
+      minDist = min(minDist, length(uv - happy) + (0.016*40. - timeOffset) * .1 );
+    }
+    float d = length(uv - vec2((0.5+0.3*sin(1.*time)) * width, (0.5+0.3*cos(0.2+1.3*time))));
+    //float d1 = length(uv - vec2((0.5+0.2*sin(2.7*time)) * width, (0.5+0.2*cos(0.2+1.9*time))));
+
+
+
+    uv.x += sin(2. * time + uv.x * 10.) * sin(exp(sin(time * 1. + uv.x * 10.)) + uv.y * 10.);
+
+    vec3 c = vec3(uv, 0.);
+
+    //c *= 1. - (step(min(minDist, d), .05));
+    c *= 1. - (smoothstep(min(minDist, d), .015, 0.075));
+
+    float t = sin(time) * sin(time) + sin(3.14 * time * uv.y) * sin(3.14 * time);
+    c = pal(c.x, vec3(0.5), vec3(0.5, 1.0, 0.3), vec3(1.0, 0.5, 0.4 + t * 0.2), vec3(0.5));
+
+
+
+    vec4 almost = vec4(c,1) * (uv.x * cos(mod(time, 3.14 * 2.)) - uv.y * sin(mod(-time, 3.14 * 2.)));
+    gl_FragColor = almost  ;
+  }

2018-04-07/06-jeanmichel.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 2,
+  "audio": true,
+  "camera": false,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+vec3 circle(vec2 uv, vec2 pos, float r, float s){
+
+vec3 res = vec3(smoothstep(r,r-s,length(uv+pos)-r));
+return res;
+}
+
+
+void main () {
+
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    uv-=0.5;
+    uv.x *= resolution.x / resolution.y;
+
+    vec3 res;
+
+
+    for (float i=0.; i<100.;i+=1.){
+      vec2 pos=vec2(0.5*sin(time+i),0.5*cos(0.5*time+i));
+      vec3 col =circle (uv.xy,pos,0.02,0.01);
+      col.x*=i;
+      res+=   col;
+
+    }
+
+    for (float i=0.; i<100.;i+=1.){
+      vec2 pos=vec2(0.5*sin(time+i),0.5*cos(0.5*time+i));
+
+      res-= circle (uv.xy,pos,0.01,0.01);
+    }
+
+    for (float i=0.; i<100.;i+=1.){
+      vec2 pos=vec2(0.5*sin(time+i+3.14),0.5*cos(0.5*time+i));
+      vec3 col =circle (uv.xy,pos,0.02,0.01);
+      col.x*=i;
+      res+=   col;
+
+    }
+
+    for (float i=0.; i<100.;i+=1.){
+      vec2 pos=vec2(0.5*sin(time+i+3.14),0.5*cos(0.5*time+i));
+
+      res-= circle (uv.xy,pos,0.01,0.01);
+    }
+
+
+        for (float i=0.; i<100.;i+=1.){
+          vec2 pos=vec2(0.5*sin(time+i+3.14*0.5),0.5*cos(0.5*time+i));
+          vec3 col =circle (uv.xy,pos,0.02,0.01);
+          col.x*=i;
+          res+=   col;
+
+        }
+
+        for (float i=0.; i<100.;i+=1.){
+          vec2 pos=vec2(0.5*sin(time+i+3.14*0.5),0.5*cos(0.5*time+i));
+
+          res-= circle (uv.xy,pos,0.01,0.01);
+        }
+
+
+
+
+
+
+
+    gl_FragColor=vec4(res,1.);
+  }

2018-04-07/07-koltes.frag

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+/*
+{"IMPORTED": {
+    "guinness": {
+      "PATH": "./guinness.png",
+    },
+  },
+  "pixelRatio": 2,
+  "audio": true,
+  "camera": false,
+  "keyboard": true,
+  "midi": true,
+}
+*/
+precision mediump float;
+
+uniform float time;
+uniform vec2 resolution;
+uniform sampler2D camera;
+uniform sampler2D key;
+uniform sampler2D samples;
+uniform sampler2D spetrum;
+
+uniform sampler2D guinness;
+
+mat2 rot(float a)
+{
+  float c = cos(a), s = sin(a);
+  return mat2(c, s, -s, c);
+}
+
+#define rand(x) fract(sin(x)*1e4)
+
+float map(vec3 p){
+  p.z -= time * 5.;
+  p.xy *= rot(p.z * .05);
+  vec3 idx=floor((p)/6.);
+  p = mod(p, 6.) - 3.;
+  p.xz *= rot(time * .5 + sin(idx.x));
+  p.xy *= rot(time * .8 + sin(idx.y));
+  p.yz *= rot(time * .8 + sin(idx.z));
+  //p.xy += -2. +  4.*rand(idx.xy + vec2(0., 3.));
+  float a=atan(p.y,p.x)/6.2831;
+  a+=1./8.;
+  a=floor(a*4.)/4.;
+  p.xy*=rot(a*6.2831);
+  p.x-=abs(p.y)*.8+.9;
+  p.y*=1.2;
+  p.z=sqrt(abs(p.z)*3.);
+  return length(p)-1.;
+}
+
+
+void main () {
+
+    vec2 uv = gl_FragCoord.xy / resolution.xy;
+    uv-=0.5;
+    uv.x *= resolution.x / resolution.y;
+
+    vec3 ro=vec3(0,0,-5),rd=normalize(vec3(uv,1.-length(uv)*.5)),mp=ro+rd*3.;
+    float ff;
+    for (float f=0.;f<30.;++f){
+      ff=f;
+      float d=map(mp);
+      if (d<0.01)break;
+      mp+=rd*d;
+    }
+    vec3 c=mix(vec3(0,1,0) *(1. -ff/30.), vec3(0), smoothstep(25.,30.,ff));
+    gl_FragColor=vec4(c,1.);
+  }

2018-04-07/Readme.md

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+# Shader Showdown Paris #7
+
+On April 7th, 2018 at [O'Regans, Laval, France](https://www.facebook.com/ORegans-135863436463053/).
+
+[Video on YouTube](https://youtu.be/6ul-jeLTQbM)
+
+## Exquisite Shader
+
+1. Elie
+2. Koltes
+3. Elie
+4. Elie
+5. Adrian
+6. Jean-Michel
+7. Koltes
+
+## Software
+
+- [VEDA](https://veda.gl/) (`.frag`)