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/*{
  "DESCRIPTION": "Frostwork — a dendritic Julia set grown as delicate ice crystals across frosted glass, glowing with cold backlight.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "zoom",   "TYPE": "float", "DEFAULT": 1.5, "MIN": 0.6, "MAX": 3.0 },
    { "NAME": "cmorph", "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 },
    { "NAME": "frost",  "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.2, "MAX": 1.6 },
    { "NAME": "tint",   "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

float hash(vec2 p){ p = fract(p * vec2(123.34, 456.21)); p += dot(p, p + 45.32); return fract(p.x * p.y); }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  vec2 z = uv * zoom;

  float th = TIME * 0.1 * cmorph;
  vec2 c = vec2(-0.745, 0.113) + 0.03 * cmorph * vec2(cos(th), sin(th));   // dendritic Julia

  float it = 0.0, m = 0.0, trap = 1e9;
  for (int i = 0; i < 128; i++){
    z = vec2(z.x * z.x - z.y * z.y, 2.0 * z.x * z.y) + c;
    m = dot(z, z);
    trap = min(trap, abs(z.x) + abs(z.y));    // thin filament orbit trap (crystal spines)
    if (m > 64.0) break;
    it += 1.0;
  }

  // frosted-glass background: cold gradient + breath of frost
  vec3 glass = mix(vec3(0.06, 0.12, 0.22), vec3(0.02, 0.05, 0.12), length(uv));
  glass = mix(glass, vec3(0.1, 0.16, 0.26), tint);

  vec3 ice = mix(vec3(0.75, 0.9, 1.0), vec3(0.85, 0.92, 1.0), tint);

  vec3 col = glass;
  if (m > 64.0){
    float sm = it - log2(log2(m)) + 4.0;
    float edge = smoothstep(2.0, 22.0, sm);          // crystal grows densest near the boundary
    col = mix(glass, ice * 0.8, edge);
    col += ice * pow(edge, 2.5) * frost * 0.8;        // bright crystalline filaments
  }
  // sharp crystal spines from the orbit trap
  float spine = exp(-trap * 9.0);
  col += ice * spine * frost * (0.5 + 0.5 * (m > 64.0 ? 1.0 : 0.0));
  col += vec3(1.0) * pow(spine, 3.0) * 0.4 * frost;   // glinting frost

  // frosted speckle
  col += (hash(gl_FragCoord.xy) - 0.5) * 0.03;

  col *= 1.0 - 0.3 * dot(uv, uv);
  col = col / (1.0 + 0.4 * col);
  col = pow(max(col, 0.0), vec3(0.9));
  gl_FragColor = vec4(col, 1.0);
}

/*{
  "DESCRIPTION": "Frostwork — a dendritic Julia set grown as delicate ice crystals across frosted glass, glowing with cold backlight.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "zoom",   "TYPE": "float", "DEFAULT": 1.5, "MIN": 0.6, "MAX": 3.0 },
    { "NAME": "cmorph", "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 },
    { "NAME": "frost",  "TYPE": "float", "DEFAULT": 0.8, "MIN": 0.2, "MAX": 1.6 },
    { "NAME": "tint",   "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

float hash(vec2 p){ p = fract(p * vec2(123.34, 456.21)); p += dot(p, p + 45.32); return fract(p.x * p.y); }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  vec2 z = uv * zoom;

float th = TIME * 0.1 * cmorph;
  vec2 c = vec2(-0.745, 0.113) + 0.03 * cmorph * vec2(cos(th), sin(th));   // dendritic Julia

float it = 0.0, m = 0.0, trap = 1e9;
  for (int i = 0; i < 128; i++){
    z = vec2(z.x * z.x - z.y * z.y, 2.0 * z.x * z.y) + c;
    m = dot(z, z);
    trap = min(trap, abs(z.x) + abs(z.y));    // thin filament orbit trap (crystal spines)
    if (m > 64.0) break;
    it += 1.0;
  }

// frosted-glass background: cold gradient + breath of frost
  vec3 glass = mix(vec3(0.06, 0.12, 0.22), vec3(0.02, 0.05, 0.12), length(uv));
  glass = mix(glass, vec3(0.1, 0.16, 0.26), tint);

vec3 ice = mix(vec3(0.75, 0.9, 1.0), vec3(0.85, 0.92, 1.0), tint);

vec3 col = glass;
  if (m > 64.0){
    float sm = it - log2(log2(m)) + 4.0;
    float edge = smoothstep(2.0, 22.0, sm);          // crystal grows densest near the boundary
    col = mix(glass, ice * 0.8, edge);
    col += ice * pow(edge, 2.5) * frost * 0.8;        // bright crystalline filaments
  }
  // sharp crystal spines from the orbit trap
  float spine = exp(-trap * 9.0);
  col += ice * spine * frost * (0.5 + 0.5 * (m > 64.0 ? 1.0 : 0.0));
  col += vec3(1.0) * pow(spine, 3.0) * 0.4 * frost;   // glinting frost

// frosted speckle
  col += (hash(gl_FragCoord.xy) - 0.5) * 0.03;

col *= 1.0 - 0.3 * dot(uv, uv);
  col = col / (1.0 + 0.4 * col);
  col = pow(max(col, 0.0), vec3(0.9));
  gl_FragColor = vec4(col, 1.0);
}

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