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/*{
  "DESCRIPTION": "Toxic malachite — domain-warped fbm banded into the swirling concentric veins of poison-green stone, slowly churning.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "scale", "TYPE": "float", "DEFAULT": 2.4, "MIN": 1.0, "MAX": 5.0 },
    { "NAME": "warp",  "TYPE": "float", "DEFAULT": 3.5, "MIN": 1.0, "MAX": 6.0 },
    { "NAME": "bands", "TYPE": "float", "DEFAULT": 9.0, "MIN": 3.0, "MAX": 20.0 },
    { "NAME": "tox",   "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); }
float noise(vec2 p){
  vec2 i = floor(p), f = fract(p); f = f * f * (3.0 - 2.0 * f);
  float a = hash(i), b = hash(i + vec2(1.0, 0.0)), c = hash(i + vec2(0.0, 1.0)), d = hash(i + vec2(1.0, 1.0));
  return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);
}
float fbm(vec2 p){ float s = 0.0, a = 0.5; for (int i = 0; i < 5; i++){ s += a * noise(p); p = p * 2.02 + 5.0; a *= 0.5; } return s; }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  vec2 p = uv * scale;
  float t = TIME * 0.08;

  // heavy domain warp -> botryoidal swirls
  vec2 drift = vec2(0.3 * sin(t), 0.2 * cos(t * 1.1));
  vec2 q = vec2(fbm(p + drift), fbm(p + vec2(5.2, 1.3) - drift));
  vec2 r = vec2(fbm(p + warp * q + vec2(1.7, 9.2) + drift), fbm(p + warp * q + vec2(8.3, 2.8)));
  float f = fbm(p + warp * r);

  // agate/malachite banding: a concentric ring ramp warped by the turbulence -> botryoidal veins
  float ramp = length(p - 0.6 * r) * bands;                 // concentric, but centre wanders with the warp
  float phase = ramp + (f - 0.5) * 9.0;
  float band = sin(phase);                                  // -1..1, even coverage everywhere
  float litness = 0.5 + 0.5 * band;
  float vein = smoothstep(0.12, 0.0, abs(band));            // thin black vein at each ring edge
  float crest = pow(litness, 2.5);

  vec3 deep  = vec3(0.01, 0.17, 0.05);
  vec3 mid   = mix(vec3(0.07, 0.44, 0.13), vec3(0.15, 0.52, 0.2), tox);
  vec3 light = mix(vec3(0.55, 0.9, 0.3), vec3(0.72, 1.0, 0.42), tox);

  vec3 col = mix(deep, mid, litness);
  col = mix(col, light, crest);
  col += light * pow(crest, 2.0) * 0.35;                    // polished sheen on ring crests
  col *= 1.0 - 0.8 * vein;                                  // black vein lines between rings

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

/*{
  "DESCRIPTION": "Toxic malachite — domain-warped fbm banded into the swirling concentric veins of poison-green stone, slowly churning.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "scale", "TYPE": "float", "DEFAULT": 2.4, "MIN": 1.0, "MAX": 5.0 },
    { "NAME": "warp",  "TYPE": "float", "DEFAULT": 3.5, "MIN": 1.0, "MAX": 6.0 },
    { "NAME": "bands", "TYPE": "float", "DEFAULT": 9.0, "MIN": 3.0, "MAX": 20.0 },
    { "NAME": "tox",   "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); }
float noise(vec2 p){
  vec2 i = floor(p), f = fract(p); f = f * f * (3.0 - 2.0 * f);
  float a = hash(i), b = hash(i + vec2(1.0, 0.0)), c = hash(i + vec2(0.0, 1.0)), d = hash(i + vec2(1.0, 1.0));
  return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);
}
float fbm(vec2 p){ float s = 0.0, a = 0.5; for (int i = 0; i < 5; i++){ s += a * noise(p); p = p * 2.02 + 5.0; a *= 0.5; } return s; }

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  vec2 p = uv * scale;
  float t = TIME * 0.08;

// heavy domain warp -> botryoidal swirls
  vec2 drift = vec2(0.3 * sin(t), 0.2 * cos(t * 1.1));
  vec2 q = vec2(fbm(p + drift), fbm(p + vec2(5.2, 1.3) - drift));
  vec2 r = vec2(fbm(p + warp * q + vec2(1.7, 9.2) + drift), fbm(p + warp * q + vec2(8.3, 2.8)));
  float f = fbm(p + warp * r);

// agate/malachite banding: a concentric ring ramp warped by the turbulence -> botryoidal veins
  float ramp = length(p - 0.6 * r) * bands;                 // concentric, but centre wanders with the warp
  float phase = ramp + (f - 0.5) * 9.0;
  float band = sin(phase);                                  // -1..1, even coverage everywhere
  float litness = 0.5 + 0.5 * band;
  float vein = smoothstep(0.12, 0.0, abs(band));            // thin black vein at each ring edge
  float crest = pow(litness, 2.5);

vec3 deep  = vec3(0.01, 0.17, 0.05);
  vec3 mid   = mix(vec3(0.07, 0.44, 0.13), vec3(0.15, 0.52, 0.2), tox);
  vec3 light = mix(vec3(0.55, 0.9, 0.3), vec3(0.72, 1.0, 0.42), tox);

vec3 col = mix(deep, mid, litness);
  col = mix(col, light, crest);
  col += light * pow(crest, 2.0) * 0.35;                    // polished sheen on ring crests
  col *= 1.0 - 0.8 * vein;                                  // black vein lines between rings

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

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