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/*{
  "DESCRIPTION": "Spiral galaxy — log-spiral arms of blue starlight winding out of a glowing core, threaded with dust lanes.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "arms",  "TYPE": "float", "DEFAULT": 2.0, "MIN": 1.0, "MAX": 5.0 },
    { "NAME": "pitch", "TYPE": "float", "DEFAULT": 4.0, "MIN": 1.5, "MAX": 8.0 },
    { "NAME": "spin",  "TYPE": "float", "DEFAULT": 0.1, "MIN": 0.0, "MAX": 0.6 },
    { "NAME": "tint",  "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define TAU 6.28318530718
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);
}

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= mat2(1.0, 0.0, 0.0, 0.72);                  // slight inclination (elliptical disk)
  float r = length(uv);
  float a = atan(uv.y, uv.x) + TIME * spin;

  // logarithmic spiral arms (density wave)
  float spiral = a * arms - log(r + 0.02) * pitch;
  float arm = pow(0.5 + 0.5 * cos(spiral), 2.2);
  float disk = exp(-r * 2.3);                       // galactic disk falloff
  float density = arm * disk;

  // dust lane: a dark offset copy on the inner edge of each arm
  float dust = pow(0.5 + 0.5 * cos(spiral + 0.7), 3.0) * disk;
  density *= 1.0 - 0.6 * dust;

  // clumpy star clouds within the arms (follow the swirl)
  vec2 sw = vec2(cos(a), sin(a)) * r;
  float clump = 0.45 + 1.1 * noise(sw * 9.0 + spiral);
  density *= clump;

  vec3 armCol = mix(vec3(0.2, 0.45, 1.0), vec3(0.35, 0.4, 0.95), tint);   // blue starlight
  vec3 col = vec3(0.0, 0.01, 0.03);                 // intergalactic dark
  col += armCol * density * 2.2;
  col += vec3(0.95, 0.4, 0.6) * pow(density, 2.0) * 0.8 * smoothstep(0.4, 0.9, clump);   // pink HII knots
  col += vec3(0.85, 0.95, 1.0) * pow(density, 4.0) * 0.6;  // bright OB associations

  // glowing core bulge (warm)
  float core = exp(-r * r * 22.0);
  col += vec3(1.0, 0.85, 0.6) * core * 1.4;
  col += vec3(1.0, 0.95, 0.8) * exp(-r * r * 120.0) * 1.5; // bright nucleus

  // stars — concentrated in the arms + a scattered halo
  float sf = hash(floor(gl_FragCoord.xy));
  float starHere = smoothstep(0.985, 1.0, sf) * (0.3 + 1.5 * density) + smoothstep(0.997, 1.0, sf);
  col += vec3(0.9, 0.95, 1.0) * starHere * (0.6 + 0.4 * sin(TIME * 3.0 + sf * 40.0));

  col *= 1.0 - 0.2 * dot(uv, uv);
  col = col / (1.0 + 0.4 * col);
  col = pow(max(col, 0.0), vec3(0.88));
  gl_FragColor = vec4(col, 1.0);
}

/*{
  "DESCRIPTION": "Spiral galaxy — log-spiral arms of blue starlight winding out of a glowing core, threaded with dust lanes.",
  "CREDIT": "claude-opus-4-8",
  "INPUTS": [
    { "NAME": "arms",  "TYPE": "float", "DEFAULT": 2.0, "MIN": 1.0, "MAX": 5.0 },
    { "NAME": "pitch", "TYPE": "float", "DEFAULT": 4.0, "MIN": 1.5, "MAX": 8.0 },
    { "NAME": "spin",  "TYPE": "float", "DEFAULT": 0.1, "MIN": 0.0, "MAX": 0.6 },
    { "NAME": "tint",  "TYPE": "float", "DEFAULT": 0.5, "MIN": 0.0, "MAX": 1.0 }
  ]
}*/

#define TAU 6.28318530718
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);
}

void main(){
  vec2 uv = (gl_FragCoord.xy - 0.5 * RENDERSIZE) / RENDERSIZE.y;
  uv *= mat2(1.0, 0.0, 0.0, 0.72);                  // slight inclination (elliptical disk)
  float r = length(uv);
  float a = atan(uv.y, uv.x) + TIME * spin;

// logarithmic spiral arms (density wave)
  float spiral = a * arms - log(r + 0.02) * pitch;
  float arm = pow(0.5 + 0.5 * cos(spiral), 2.2);
  float disk = exp(-r * 2.3);                       // galactic disk falloff
  float density = arm * disk;

// dust lane: a dark offset copy on the inner edge of each arm
  float dust = pow(0.5 + 0.5 * cos(spiral + 0.7), 3.0) * disk;
  density *= 1.0 - 0.6 * dust;

// clumpy star clouds within the arms (follow the swirl)
  vec2 sw = vec2(cos(a), sin(a)) * r;
  float clump = 0.45 + 1.1 * noise(sw * 9.0 + spiral);
  density *= clump;

vec3 armCol = mix(vec3(0.2, 0.45, 1.0), vec3(0.35, 0.4, 0.95), tint);   // blue starlight
  vec3 col = vec3(0.0, 0.01, 0.03);                 // intergalactic dark
  col += armCol * density * 2.2;
  col += vec3(0.95, 0.4, 0.6) * pow(density, 2.0) * 0.8 * smoothstep(0.4, 0.9, clump);   // pink HII knots
  col += vec3(0.85, 0.95, 1.0) * pow(density, 4.0) * 0.6;  // bright OB associations

// glowing core bulge (warm)
  float core = exp(-r * r * 22.0);
  col += vec3(1.0, 0.85, 0.6) * core * 1.4;
  col += vec3(1.0, 0.95, 0.8) * exp(-r * r * 120.0) * 1.5; // bright nucleus

// stars — concentrated in the arms + a scattered halo
  float sf = hash(floor(gl_FragCoord.xy));
  float starHere = smoothstep(0.985, 1.0, sf) * (0.3 + 1.5 * density) + smoothstep(0.997, 1.0, sf);
  col += vec3(0.9, 0.95, 1.0) * starHere * (0.6 + 0.4 * sin(TIME * 3.0 + sf * 40.0));

col *= 1.0 - 0.2 * dot(uv, uv);
  col = col / (1.0 + 0.4 * col);
  col = pow(max(col, 0.0), vec3(0.88));
  gl_FragColor = vec4(col, 1.0);
}

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