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/*{
  "DESCRIPTION": "Wormhole — a neon wireframe grid tunnel rushing past, light pulses racing the rings toward a glowing vanishing point.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "sides", "TYPE": "float", "DEFAULT": 12.0, "MIN": 4.0, "MAX": 28.0 },
    { "NAME": "speed", "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.0, "MAX": 3.0 },
    { "NAME": "glow",  "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.2, "MAX": 1.6 },
    { "NAME": "hue",   "TYPE": "float", "DEFAULT": 0.6, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define TAU 6.28318530718
mat2 rot(float a){ float c = cos(a), s = sin(a); return mat2(c, -s, s, c); }
vec3 pal(float t){ return 0.5 + 0.5 * cos(TAU * (t + vec3(0.0, 0.33, 0.67) + hue)); }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= rot(0.1 * sin(TIME * 0.2));                 // gentle roll

  float r = length(uv);
  float a = atan(uv.y, uv.x);

  float depth = 0.35 / r + TIME * speed;            // moving into the tunnel
  float ang = a / TAU * sides;

  // glowing grid lines
  float rings  = pow(0.5 + 0.5 * cos(depth * TAU), 16.0);          // depth rings
  float spokes = pow(0.5 + 0.5 * cos(ang * TAU), 16.0) * smoothstep(0.0, 0.25, r);  // thin angular spokes

  // bright light pulses racing the rings toward the viewer
  float pulse = pow(0.5 + 0.5 * cos((depth - TIME * speed * 3.0) * TAU * 0.2), 12.0);

  // cohesive neon gradient down the tunnel
  vec3 cRing  = pal(0.05 * depth + 0.04 * TIME);
  vec3 cSpoke = pal(0.05 * depth + 0.04 * TIME + 0.12);
  vec3 col = vec3(0.0);
  col += cRing * rings * (0.35 + 0.6 * glow);
  col += cSpoke * spokes * 0.6 * glow;
  col += mix(cRing, vec3(1.0), 0.7) * rings * (2.0 * pulse) * glow;   // racing bright pulse rings
  col += vec3(0.85, 0.95, 1.0) * rings * spokes * 0.7;               // node sparkle

  // glowing vanishing point
  col += pal(0.04 * TIME + 0.5) * exp(-r * r * 26.0) * 1.3;

  col *= smoothstep(1.25, 0.12, r);                 // fade the near (outer) edge
  col = col / (1.0 + 0.5 * col);
  col = pow(max(col, 0.0), vec3(0.85));
  gl_FragColor = vec4(col, 1.0);
}

/*{
  "DESCRIPTION": "Wormhole — a neon wireframe grid tunnel rushing past, light pulses racing the rings toward a glowing vanishing point.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "sides", "TYPE": "float", "DEFAULT": 12.0, "MIN": 4.0, "MAX": 28.0 },
    { "NAME": "speed", "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.0, "MAX": 3.0 },
    { "NAME": "glow",  "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.2, "MAX": 1.6 },
    { "NAME": "hue",   "TYPE": "float", "DEFAULT": 0.6, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define TAU 6.28318530718
mat2 rot(float a){ float c = cos(a), s = sin(a); return mat2(c, -s, s, c); }
vec3 pal(float t){ return 0.5 + 0.5 * cos(TAU * (t + vec3(0.0, 0.33, 0.67) + hue)); }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= rot(0.1 * sin(TIME * 0.2));                 // gentle roll

float r = length(uv);
  float a = atan(uv.y, uv.x);

float depth = 0.35 / r + TIME * speed;            // moving into the tunnel
  float ang = a / TAU * sides;

// glowing grid lines
  float rings  = pow(0.5 + 0.5 * cos(depth * TAU), 16.0);          // depth rings
  float spokes = pow(0.5 + 0.5 * cos(ang * TAU), 16.0) * smoothstep(0.0, 0.25, r);  // thin angular spokes

// bright light pulses racing the rings toward the viewer
  float pulse = pow(0.5 + 0.5 * cos((depth - TIME * speed * 3.0) * TAU * 0.2), 12.0);

// cohesive neon gradient down the tunnel
  vec3 cRing  = pal(0.05 * depth + 0.04 * TIME);
  vec3 cSpoke = pal(0.05 * depth + 0.04 * TIME + 0.12);
  vec3 col = vec3(0.0);
  col += cRing * rings * (0.35 + 0.6 * glow);
  col += cSpoke * spokes * 0.6 * glow;
  col += mix(cRing, vec3(1.0), 0.7) * rings * (2.0 * pulse) * glow;   // racing bright pulse rings
  col += vec3(0.85, 0.95, 1.0) * rings * spokes * 0.7;               // node sparkle

// glowing vanishing point
  col += pal(0.04 * TIME + 0.5) * exp(-r * r * 26.0) * 1.3;

col *= smoothstep(1.25, 0.12, r);                 // fade the near (outer) edge
  col = col / (1.0 + 0.5 * col);
  col = pow(max(col, 0.0), vec3(0.85));
  gl_FragColor = vec4(col, 1.0);
}

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