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/*{
  "DESCRIPTION": "Snowflake — a six-fold dendritic ice crystal slowly turning and glinting against the deep cold.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "arms",  "TYPE": "float", "DEFAULT": 6.0, "MIN": 4.0, "MAX": 8.0 },
    { "NAME": "branch","TYPE": "float", "DEFAULT": 0.6, "MIN": 0.2, "MAX": 1.0 },
    { "NAME": "spin",  "TYPE": "float", "DEFAULT": 0.08, "MIN": 0.0, "MAX": 0.5 },
    { "NAME": "tint",  "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define PI 3.14159265
mat2 rot(float a){ float c = cos(a), s = sin(a); return mat2(c, -s, s, c); }
float hash(vec2 p){ p = fract(p * vec2(123.34, 456.21)); p += dot(p, p + 45.32); return fract(p.x * p.y); }

float seg(vec2 p, vec2 a, vec2 b){
  vec2 pa = p - a, ba = b - a;
  float h = clamp(dot(pa, ba) / dot(ba, ba), 0.0, 1.0);
  return length(pa - ba * h);
}

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= rot(TIME * spin);
  float r = length(uv);

  // fold into one 12th wedge (n-fold rotation + mirror)
  float a = atan(uv.y, uv.x);
  float seg6 = 2.0 * PI / arms;
  a = mod(a, seg6);
  a = abs(a - 0.5 * seg6);
  vec2 p = vec2(cos(a), sin(a)) * r;     // p.x radial, p.y >= 0 perpendicular

  float armLen = 0.78 + 0.05 * sin(TIME * 0.4);
  float d = seg(p, vec2(0.04, 0.0), vec2(armLen, 0.0));     // main spine

  // side branches (a little fern), at 60 degrees off the spine, shrinking toward the tip
  float bAng = PI / 3.0;
  vec2 bdir = vec2(cos(bAng), sin(bAng));
  for (int k = 1; k <= 6; k++){
    float bx = 0.10 * float(k);
    if (bx > armLen) break;
    float bl = branch * 0.22 * (1.0 - bx / armLen);
    d = min(d, seg(p, vec2(bx, 0.0), vec2(bx, 0.0) + bdir * bl));
  }
  // hexagonal plates along the arm (small diamonds)
  d = min(d, abs(length(p - vec2(0.34, 0.0)) - 0.05) - 0.0);
  d = min(d, abs(length(p - vec2(0.6, 0.0)) - 0.035));
  // central hex hub
  d = min(d, abs(r - 0.09) - 0.0);

  float w = 0.012;
  float crystal = smoothstep(w, 0.0, d);
  float glow = smoothstep(w * 6.0, 0.0, d);

  vec3 ice = mix(vec3(0.6, 0.85, 1.0), vec3(0.8, 0.9, 1.0), tint);
  vec3 col = mix(vec3(0.01, 0.03, 0.08), vec3(0.0, 0.01, 0.03), r);   // cold deep field
  col += smoothstep(0.99, 1.0, hash(floor(gl_FragCoord.xy))) * 0.5;    // snow dust / stars
  col += ice * crystal;
  col += ice * glow * 0.3;
  col += vec3(1.0) * crystal * (0.4 + 0.6 * sin(TIME * 3.0 + r * 20.0)) * 0.5;   // glints

  col *= 1.0 - 0.2 * dot(uv, uv);
  col = pow(max(col, 0.0), vec3(0.9));
  gl_FragColor = vec4(col, 1.0);
}

/*{
  "DESCRIPTION": "Snowflake — a six-fold dendritic ice crystal slowly turning and glinting against the deep cold.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "arms",  "TYPE": "float", "DEFAULT": 6.0, "MIN": 4.0, "MAX": 8.0 },
    { "NAME": "branch","TYPE": "float", "DEFAULT": 0.6, "MIN": 0.2, "MAX": 1.0 },
    { "NAME": "spin",  "TYPE": "float", "DEFAULT": 0.08, "MIN": 0.0, "MAX": 0.5 },
    { "NAME": "tint",  "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define PI 3.14159265
mat2 rot(float a){ float c = cos(a), s = sin(a); return mat2(c, -s, s, c); }
float hash(vec2 p){ p = fract(p * vec2(123.34, 456.21)); p += dot(p, p + 45.32); return fract(p.x * p.y); }

float seg(vec2 p, vec2 a, vec2 b){
  vec2 pa = p - a, ba = b - a;
  float h = clamp(dot(pa, ba) / dot(ba, ba), 0.0, 1.0);
  return length(pa - ba * h);
}

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= rot(TIME * spin);
  float r = length(uv);

// fold into one 12th wedge (n-fold rotation + mirror)
  float a = atan(uv.y, uv.x);
  float seg6 = 2.0 * PI / arms;
  a = mod(a, seg6);
  a = abs(a - 0.5 * seg6);
  vec2 p = vec2(cos(a), sin(a)) * r;     // p.x radial, p.y >= 0 perpendicular

float armLen = 0.78 + 0.05 * sin(TIME * 0.4);
  float d = seg(p, vec2(0.04, 0.0), vec2(armLen, 0.0));     // main spine

// side branches (a little fern), at 60 degrees off the spine, shrinking toward the tip
  float bAng = PI / 3.0;
  vec2 bdir = vec2(cos(bAng), sin(bAng));
  for (int k = 1; k <= 6; k++){
    float bx = 0.10 * float(k);
    if (bx > armLen) break;
    float bl = branch * 0.22 * (1.0 - bx / armLen);
    d = min(d, seg(p, vec2(bx, 0.0), vec2(bx, 0.0) + bdir * bl));
  }
  // hexagonal plates along the arm (small diamonds)
  d = min(d, abs(length(p - vec2(0.34, 0.0)) - 0.05) - 0.0);
  d = min(d, abs(length(p - vec2(0.6, 0.0)) - 0.035));
  // central hex hub
  d = min(d, abs(r - 0.09) - 0.0);

float w = 0.012;
  float crystal = smoothstep(w, 0.0, d);
  float glow = smoothstep(w * 6.0, 0.0, d);

vec3 ice = mix(vec3(0.6, 0.85, 1.0), vec3(0.8, 0.9, 1.0), tint);
  vec3 col = mix(vec3(0.01, 0.03, 0.08), vec3(0.0, 0.01, 0.03), r);   // cold deep field
  col += smoothstep(0.99, 1.0, hash(floor(gl_FragCoord.xy))) * 0.5;    // snow dust / stars
  col += ice * crystal;
  col += ice * glow * 0.3;
  col += vec3(1.0) * crystal * (0.4 + 0.6 * sin(TIME * 3.0 + r * 20.0)) * 0.5;   // glints

col *= 1.0 - 0.2 * dot(uv, uv);
  col = pow(max(col, 0.0), vec3(0.9));
  gl_FragColor = vec4(col, 1.0);
}

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