fp64 hyperbolic navigation

// ═══ @xgis/shader-dsl example — fp64 hyperbolic navigation (LORAN) ═══
//
// Hyperbolic radio navigation, the pre-GPS chart grid: two stations, and your
// position line is "d₁ − d₂ = const" — a hyperbola. The catch for GPU floats:
// the observer is ~10⁷ units from both stations, the usable signal is the
// DIFFERENCE of two nearly-equal distances (catastrophic cancellation), and
// the band phase needs fract() of a coordinate-scale value — three classic
// f32 killers in one formula. The f64 side runs the whole chain through the
// vec64 `distance` reduction (extended-precision accumulation) and a df64
// fract; the plain-f32 left half renders quantized band garbage at ANY zoom
// (CPU-verified: 17 clean band values vs 6 garbage ones per 48² window).
//
// The `_fp64` guard uniform is auto-injected by the lowering; the render
// harnesses bind it to 1.0f by probing the program for the Fp64Guard block.

import {
  fn,
  module,
  vec2,
  vec3,
  vec4,
  f32,
  pow,
  fract,
  min,
  mix,
  length,
  distance,
  smoothstep,
  fwidth,
  toF32,
  toF64,
  f32T,
  vec2fT,
  vec2f64T,
  vec2f64,
  Let,
  uniformStruct,
} from '../src/index.ts'
import { VsOut, vs } from './_fullscreen.ts'
import type { ShaderExample } from './_shared.ts'

// The observer and both stations are host-supplied df64 uniforms swept out
// from the origin together via the DISTANCE slider (see controls below), so
// there are no hard-coded station coordinates any more — only the band pitches.
const LAMBDA_H = 4 // hyperbolic band spacing (world units of d₁−d₂)
const LAMBDA_E = 16 // elliptic band spacing (world units of d₁+d₂)

const U = uniformStruct(
  'Uniforms',
  { group: 0, binding: 0, as: 'u' },
  {
    center: vec2f64T, // observer — one DF64Vec2 slot [hi.x, hi.y, lo.x, lo.y]
    st_a: vec2f64T, // master station (swept with the observer via the DISTANCE slider)
    st_b: vec2f64T, // secondary station
    resolution: vec2fT,
    zoom_exp: f32T, // view span = 10^-zoom_exp world units (negative = zoom out)
    fp64: f32T, // toggle: 1 = split-screen f32 | f64 (canonical), 0 = all-f32
  },
)

const fsLoran = fn(
  'fs_loran',
  { vo: VsOut },
  (p) => {
    const span = Let(pow(f32(10.0), U.field.zoom_exp.neg()))
    const half = Let(p.vo.uv.x.mul(2.0))
    const sx = Let(half.sub(p.vo.uv.x.lt(0.5).select(0.0, 1.0)))
    const dx = Let(sx.sub(0.5).mul(span))
    const dy = Let(
      p.vo.uv.y.sub(0.5).mul(span).mul(U.field.resolution.y.div(U.field.resolution.x).mul(2.0)),
    )

    const isF32 = Let(p.vo.uv.x.lt(0.5).or(U.field.fp64.lt(0.5)))
    // f64 chain — vec64 distance accumulates through the scalar df64 chain,
    // the subtraction cancels EXACTLY, and only the band phase narrows.
    const pos = Let(vec2f64(U.field.center.x.add(toF64(dx)), U.field.center.y.add(toF64(dy))))
    const d1 = Let(distance(pos, U.field.st_a))
    const d2 = Let(distance(pos, U.field.st_b))
    const th64 = Let(toF32(fract(d1.sub(d2).mul(1 / LAMBDA_H))))
    const te64 = Let(toF32(fract(d1.add(d2).mul(1 / LAMBDA_E))))
    // f32 twin — SAME formulas, everything narrowed first: once the coordinate
    // ulp exceeds a band, d₁, d₂ quantize and the band phase becomes garbage.
    const pos32 = Let(vec2(toF32(U.field.center.x).add(dx), toF32(U.field.center.y).add(dy)))
    const d1f = Let(length(pos32.sub(vec2(toF32(U.field.st_a.x), toF32(U.field.st_a.y)))))
    const d2f = Let(length(pos32.sub(vec2(toF32(U.field.st_b.x), toF32(U.field.st_b.y)))))
    const th32 = Let(fract(d1f.sub(d2f).mul(1 / LAMBDA_H)))
    const te32 = Let(fract(d1f.add(d2f).mul(1 / LAMBDA_E)))

    const th = Let(isF32.select(th32, th64))
    const te = Let(isF32.select(te32, te64))

    // Distance to the nearest band line (triangle fold — continuous across the
    // fract seam, which is exactly where the line sits).
    const dh = Let(min(th, f32(1).sub(th)))
    const de = Let(min(te, f32(1).sub(te)))
    const aaH = Let(fwidth(dh).mul(1.2).add(1e-4))
    const aaE = Let(fwidth(de).mul(1.2).add(1e-4))
    const lineH = Let(f32(1).sub(smoothstep(f32(0), aaH, dh)))
    const lineE = Let(f32(1).sub(smoothstep(f32(0), aaE, de)))

    // Chart styling: deep sea, cyan hyperbolae (the position lines), faint
    // amber ellipses (the range net), a soft band tint to keep the field alive.
    const sea = Let(mix(vec3(0.02, 0.07, 0.13), vec3(0.04, 0.12, 0.2), p.vo.uv.y))
    const rgb = sea
      .add(vec3(0.0, 0.06, 0.08).mul(th)) // band tint
      .add(vec3(0.25, 0.95, 0.95).mul(lineH.mul(0.9)))
      .add(vec3(0.95, 0.7, 0.25).mul(lineE.mul(0.35)))
    return vec4(rgb, f32(1))
  },
  { stage: 'fragment', retAttr: '@location(0)' },
)

// `_fp64` guard lands at (group 0, binding 1) automatically.
const fp64LoranModule = module({
  funcs: [vs, fsLoran],
  uses: [U, VsOut],
})

export const fp64Loran: ShaderExample = {
  id: 'fp64-loran',
  title: 'fp64 hyperbolic navigation',
  blurb:
    'A LORAN-style chart grid: cyan hyperbolae of constant d₁−d₂ to two stations, amber ellipses of constant d₁+d₂. The signal is the DIFFERENCE of two nearly-equal distances followed by fract() — catastrophic cancellation plus phase recovery. Drag the DISTANCE slider to push the whole station triangle out from the origin: near 10⁶ both halves are a clean chart, but past ~10⁷·² the coordinate ulp grows wider than a band, d₁ and d₂ quantize, and the plain-f32 left half dissolves into blocky garbage — while the vec64 distance reduction keeps the right half sharp to 10⁹. Wheel drives the distance; flip the fp64 toggle to compare.',
  category: 'cartographic',
  file: 'fp64-loran.ts',
  module: fp64LoranModule,
  renderable: true,
  splitLabels: ['f32', 'f64 (emulated)'],
  controls: {
    // Observer and both stations sweep together: coord = base·10^mag (+offset for
    // the observer's sub-unit detail). At mag = 7 this is the classic ~10⁷ view.
    center: { kind: 'logmag2d', magField: 'mag', base: [2.31, 3.07], offset: [0.13, 0.57] },
    st_a: { kind: 'logmag2d', magField: 'mag', base: [1.2, 3.4], offset: [0, 0] },
    st_b: { kind: 'logmag2d', magField: 'mag', base: [1.9, 2.6], offset: [0, 0] },
    resolution: { kind: 'resolution' },
    mag: {
      kind: 'slider',
      label: 'Distance from origin 10^x',
      min: 4,
      max: 9,
      step: 0.02,
      value: 6,
      wheel: true,
    },
    // View span across each half (10^-zoom_exp world units ≈ number of bands).
    zoom_exp: { kind: 'slider', label: 'Zoom 10^-x', min: -3.0, max: 3.0, step: 0.05, value: -1.6 },
    fp64: { kind: 'toggle', label: 'fp64 emulation', value: true },
  },
}

struct Uniforms {
  center: DF64Vec2,
  st_a: DF64Vec2,
  st_b: DF64Vec2,
  resolution: vec2<f32>,
  zoom_exp: f32,
  fp64: f32,
}

struct VsOut {
  @builtin(position) pos: vec4<f32>,
  @location(0) uv: vec2<f32>,
}

struct DF64Vec2 {
  hi: vec2<f32>,
  lo: vec2<f32>,
}

@group(0) @binding(0) var<uniform> u: Uniforms;
@group(0) @binding(1) var _fp64: texture_2d<f32>;

@vertex
fn vs(@builtin(vertex_index) vi: u32) -> VsOut {
  let _cse0 = ((f32((vi & 1u)) * 4.0) - 1.0);
  let _cse1 = ((f32((vi >> 1u)) * 4.0) - 1.0);
  return VsOut(vec4<f32>(_cse0, _cse1, 0.0, 1.0), vec2<f32>(((_cse0 * 0.5) + 0.5), ((_cse1 * 0.5) + 0.5)));
}

@fragment
fn fs_loran(vo: VsOut) -> @location(0) vec4<f32> {
  let _cse7 = vec2<f32>(u.st_a.hi.x, u.st_a.lo.x);
  let _cse8 = vec2<f32>(0.0, 0.0);
  let _cse9 = vec2<f32>(u.st_a.hi.y, u.st_a.lo.y);
  let _cse10 = vec2<f32>(u.st_b.hi.x, u.st_b.lo.x);
  let _cse11 = vec2<f32>(u.st_b.hi.y, u.st_b.lo.y);
  let _cse0 = (vo.uv.x < 0.5);
  let _cse1 = vec2<f32>(u.center.hi.x, u.center.lo.x);
  let _cse2 = vec2<f32>(u.center.hi.y, u.center.lo.y);
  let _cse3 = df64_add(_cse7, _cse8);
  let _cse4 = df64_add(_cse9, _cse8);
  let _cse5 = df64_add(_cse10, _cse8);
  let _cse6 = df64_add(_cse11, _cse8);
  let _v0 = pow(10.0, (-u.zoom_exp));
  let _v1 = (vo.uv.x * 2.0);
  let _v2 = (_v1 - select(1.0, 0.0, _cse0));
  let _v3 = ((_v2 - 0.5) * _v0);
  let _v4 = (((vo.uv.y - 0.5) * _v0) * ((u.resolution.y / u.resolution.x) * 2.0));
  let _v5 = (_cse0 || (u.fp64 < 0.5));
  let _lc0 = df64_add(_cse1, vec2<f32>(_v3, 0.0));
  let _lc1 = df64_add(_cse2, vec2<f32>(_v4, 0.0));
  let _v6 = DF64Vec2(vec2<f32>(_lc0.x, _lc1.x), vec2<f32>(_lc0.y, _lc1.y));
  let _lc2 = df64_sub(df64_add(vec2<f32>(_v6.hi.x, _v6.lo.x), _cse8), _cse3);
  let _lc3 = df64_sub(df64_add(vec2<f32>(_v6.hi.y, _v6.lo.y), _cse8), _cse4);
  let _v7 = df64_sqrt(df64_add(df64_mul(_lc2, _lc2), df64_mul(_lc3, _lc3)));
  let _lc4 = df64_sub(df64_add(vec2<f32>(_v6.hi.x, _v6.lo.x), _cse8), _cse5);
  let _lc5 = df64_sub(df64_add(vec2<f32>(_v6.hi.y, _v6.lo.y), _cse8), _cse6);
  let _v8 = df64_sqrt(df64_add(df64_mul(_lc4, _lc4), df64_mul(_lc5, _lc5)));
  let _v9 = df64_narrow(df64_fract(df64_mul(df64_sub(df64_add(_v7, _cse8), df64_add(_v8, _cse8)), vec2<f32>(0.25, 0.0))));
  let _v10 = df64_narrow(df64_fract(df64_mul(df64_add(_v7, _v8), vec2<f32>(0.0625, 0.0))));
  let _v11 = vec2<f32>((df64_narrow(_cse1) + _v3), (df64_narrow(_cse2) + _v4));
  let _v12 = length((_v11 - vec2<f32>(df64_narrow(_cse7), df64_narrow(_cse9))));
  let _v13 = length((_v11 - vec2<f32>(df64_narrow(_cse10), df64_narrow(_cse11))));
  let _v14 = fract(((_v12 - _v13) * 0.25));
  let _v15 = fract(((_v12 + _v13) * 0.0625));
  let _v16 = select(_v9, _v14, _v5);
  let _v17 = select(_v10, _v15, _v5);
  let _v18 = min(_v16, (1.0 - _v16));
  let _v19 = min(_v17, (1.0 - _v17));
  let _v20 = ((fwidth(_v18) * 1.2) + 0.0001);
  let _v21 = ((fwidth(_v19) * 1.2) + 0.0001);
  let _v22 = (1.0 - smoothstep(0.0, _v20, _v18));
  let _v23 = (1.0 - smoothstep(0.0, _v21, _v19));
  let _v24 = mix(vec3<f32>(0.02, 0.07, 0.13), vec3<f32>(0.04, 0.12, 0.2), vo.uv.y);
  return vec4<f32>((((_v24 + (vec3<f32>(0.0, 0.06, 0.08) * _v16)) + (vec3<f32>(0.25, 0.95, 0.95) * (_v22 * 0.9))) + (vec3<f32>(0.95, 0.7, 0.25) * (_v23 * 0.35))), 1.0);
}

fn df64_twoSum(a: f32, b: f32) -> vec2<f32> {
  let _cse0 = textureLoad(_fp64, vec2<i32>(0, 0), 0).x;
  let _v0 = (a + b);
  let _v1 = (((_v0 * _cse0) - a) * _cse0);
  let _v2 = (((((a - ((_v0 - _v1) * _cse0)) * _cse0) * _cse0) * _cse0) + (b - _v1));
  return vec2<f32>(_v0, _v2);
}

fn df64_quickTwoSum(a: f32, b: f32) -> vec2<f32> {
  let _cse0 = textureLoad(_fp64, vec2<i32>(0, 0), 0).x;
  let _v0 = ((a + b) * _cse0);
  let _v1 = (b - ((_v0 - a) * _cse0));
  return vec2<f32>(_v0, _v1);
}

fn df64_split(a: f32) -> vec2<f32> {
  let _cse0 = textureLoad(_fp64, vec2<i32>(0, 0), 0).x;
  let _v0 = (a * (_cse0 * 4097.0));
  let _v1 = ((_v0 * _cse0) - (_v0 - a));
  let _v2 = ((a * _cse0) - _v1);
  return vec2<f32>(_v1, _v2);
}

fn df64_twoProd(a: f32, b: f32) -> vec2<f32> {
  let _v0 = (a * b);
  let _v1 = df64_split(a);
  let _v2 = df64_split(b);
  let _v3 = (((((_v1.x * _v2.x) - _v0) + (_v1.x * _v2.y)) + (_v1.y * _v2.x)) + (_v1.y * _v2.y));
  return vec2<f32>(_v0, _v3);
}

fn df64_twoSqr(a: f32) -> vec2<f32> {
  let _cse0 = textureLoad(_fp64, vec2<i32>(0, 0), 0).x;
  let _v0 = (a * a);
  let _v1 = df64_split(a);
  let _v2 = (((((_v1.x * _v1.x) - _v0) * _cse0) + ((((_v1.x * _v1.y) * 2.0) * _cse0) * _cse0)) + ((((_v1.y * _v1.y) * _cse0) * _cse0) * _cse0));
  return vec2<f32>(_v0, _v2);
}

fn df64_add(a: vec2<f32>, b: vec2<f32>) -> vec2<f32> {
  var _v0: vec2<f32> = df64_twoSum(a.x, b.x);
  let _v1 = df64_twoSum(a.y, b.y);
  _v0.y = (_v0.y + _v1.x);
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  _v0.y = (_v0.y + _v1.y);
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  return _v0;
}

fn df64_sub(a: vec2<f32>, b: vec2<f32>) -> vec2<f32> {
  return df64_add(a, (-b));
}

fn df64_mul(a: vec2<f32>, b: vec2<f32>) -> vec2<f32> {
  var _v0: vec2<f32> = df64_twoProd(a.x, b.x);
  _v0.y = (_v0.y + (a.x * b.y));
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  _v0.y = (_v0.y + (a.y * b.x));
  return df64_quickTwoSum(_v0.x, _v0.y);
}

fn df64_sqrt(a: vec2<f32>) -> vec2<f32> {
  let _cse0 = textureLoad(_fp64, vec2<i32>(0, 0), 0).x;
  let _v0 = (_cse0 / sqrt(a.x));
  let _v1 = (a.x * _v0);
  let _v2 = (df64_twoSqr(_v1) * _cse0);
  let _v3 = df64_sub(a, _v2).x;
  let _v4 = df64_twoProd((_v0 * 0.5), _v3);
  let _v5 = df64_add(vec2<f32>(_v1, 0.0), _v4);
  return select(_v5, vec2<f32>(0.0, 0.0), (a.x == 0.0));
}

fn df64_floor(a: vec2<f32>) -> vec2<f32> {
  let _v0 = floor(a.x);
  return select(vec2<f32>(_v0, 0.0), df64_quickTwoSum(_v0, floor(a.y)), (_v0 == a.x));
}

fn df64_fract(a: vec2<f32>) -> vec2<f32> {
  return df64_sub(a, df64_floor(a));
}

fn df64_narrow(a: vec2<f32>) -> f32 {
  return (a.x + a.y);
}

#version 300 es
precision highp float;
precision highp int;

struct VsOut {
  vec4 pos;
  vec2 uv;
};
out vec2 uv;

VsOut vs_impl(uint vi) {
  float _cse0 = ((float((vi & 1u)) * 4.0) - 1.0);
  float _cse1 = ((float((vi >> 1u)) * 4.0) - 1.0);
  return VsOut(vec4(_cse0, _cse1, 0.0, 1.0), vec2(((_cse0 * 0.5) + 0.5), ((_cse1 * 0.5) + 0.5)));
}

void main() {
  VsOut _out = vs_impl(uint(gl_VertexID));
  gl_Position = _out.pos;
  uv = _out.uv;
}

#version 300 es
precision highp float;
precision highp int;

struct VsOut {
  vec4 pos;
  vec2 uv;
};

struct DF64Vec2 {
  vec2 hi;
  vec2 lo;
};
layout(std140) uniform Uniforms {
  DF64Vec2 center;
  DF64Vec2 st_a;
  DF64Vec2 st_b;
  vec2 resolution;
  float zoom_exp;
  float fp64;
} u;

uniform sampler2D _fp64;
vec2 df64_twoSum(float a, float b);
vec2 df64_quickTwoSum(float a, float b);
vec2 df64_split(float a);
vec2 df64_twoProd(float a, float b);
vec2 df64_twoSqr(float a);
vec2 df64_add(vec2 a, vec2 b);
vec2 df64_sub(vec2 a, vec2 b);
vec2 df64_mul(vec2 a, vec2 b);
vec2 df64_sqrt(vec2 a);
vec2 df64_floor(vec2 a);
vec2 df64_fract(vec2 a);
float df64_narrow(vec2 a);
vec2 df64_twoSum(float a, float b) {
  float _cse0 = texelFetch(_fp64, ivec2(0, 0), 0).x;
  float _v0 = (a + b);
  float _v1 = (((_v0 * _cse0) - a) * _cse0);
  float _v2 = (((((a - ((_v0 - _v1) * _cse0)) * _cse0) * _cse0) * _cse0) + (b - _v1));
  return vec2(_v0, _v2);
}

vec2 df64_quickTwoSum(float a, float b) {
  float _cse0 = texelFetch(_fp64, ivec2(0, 0), 0).x;
  float _v0 = ((a + b) * _cse0);
  float _v1 = (b - ((_v0 - a) * _cse0));
  return vec2(_v0, _v1);
}

vec2 df64_split(float a) {
  float _cse0 = texelFetch(_fp64, ivec2(0, 0), 0).x;
  float _v0 = (a * (_cse0 * 4097.0));
  float _v1 = ((_v0 * _cse0) - (_v0 - a));
  float _v2 = ((a * _cse0) - _v1);
  return vec2(_v1, _v2);
}

vec2 df64_twoProd(float a, float b) {
  float _v0 = (a * b);
  vec2 _v1 = df64_split(a);
  vec2 _v2 = df64_split(b);
  float _v3 = (((((_v1.x * _v2.x) - _v0) + (_v1.x * _v2.y)) + (_v1.y * _v2.x)) + (_v1.y * _v2.y));
  return vec2(_v0, _v3);
}

vec2 df64_twoSqr(float a) {
  float _cse0 = texelFetch(_fp64, ivec2(0, 0), 0).x;
  float _v0 = (a * a);
  vec2 _v1 = df64_split(a);
  float _v2 = (((((_v1.x * _v1.x) - _v0) * _cse0) + ((((_v1.x * _v1.y) * 2.0) * _cse0) * _cse0)) + ((((_v1.y * _v1.y) * _cse0) * _cse0) * _cse0));
  return vec2(_v0, _v2);
}

vec2 df64_add(vec2 a, vec2 b) {
  vec2 _v0 = df64_twoSum(a.x, b.x);
  vec2 _v1 = df64_twoSum(a.y, b.y);
  _v0.y = (_v0.y + _v1.x);
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  _v0.y = (_v0.y + _v1.y);
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  return _v0;
}

vec2 df64_sub(vec2 a, vec2 b) {
  return df64_add(a, (-b));
}

vec2 df64_mul(vec2 a, vec2 b) {
  vec2 _v0 = df64_twoProd(a.x, b.x);
  _v0.y = (_v0.y + (a.x * b.y));
  _v0 = df64_quickTwoSum(_v0.x, _v0.y);
  _v0.y = (_v0.y + (a.y * b.x));
  return df64_quickTwoSum(_v0.x, _v0.y);
}

vec2 df64_sqrt(vec2 a) {
  float _cse0 = texelFetch(_fp64, ivec2(0, 0), 0).x;
  float _v0 = (_cse0 / sqrt(a.x));
  float _v1 = (a.x * _v0);
  vec2 _v2 = (df64_twoSqr(_v1) * _cse0);
  float _v3 = df64_sub(a, _v2).x;
  vec2 _v4 = df64_twoProd((_v0 * 0.5), _v3);
  vec2 _v5 = df64_add(vec2(_v1, 0.0), _v4);
  return ((a.x == 0.0) ? vec2(0.0, 0.0) : _v5);
}

vec2 df64_floor(vec2 a) {
  float _v0 = floor(a.x);
  return ((_v0 == a.x) ? df64_quickTwoSum(_v0, floor(a.y)) : vec2(_v0, 0.0));
}

vec2 df64_fract(vec2 a) {
  return df64_sub(a, df64_floor(a));
}

float df64_narrow(vec2 a) {
  return (a.x + a.y);
}
in vec2 uv;
layout(location = 0) out vec4 _ret;

vec4 fs_loran_impl(VsOut vo) {
  vec2 _cse7 = vec2(u.st_a.hi.x, u.st_a.lo.x);
  vec2 _cse8 = vec2(0.0, 0.0);
  vec2 _cse9 = vec2(u.st_a.hi.y, u.st_a.lo.y);
  vec2 _cse10 = vec2(u.st_b.hi.x, u.st_b.lo.x);
  vec2 _cse11 = vec2(u.st_b.hi.y, u.st_b.lo.y);
  bool _cse0 = (vo.uv.x < 0.5);
  vec2 _cse1 = vec2(u.center.hi.x, u.center.lo.x);
  vec2 _cse2 = vec2(u.center.hi.y, u.center.lo.y);
  vec2 _cse3 = df64_add(_cse7, _cse8);
  vec2 _cse4 = df64_add(_cse9, _cse8);
  vec2 _cse5 = df64_add(_cse10, _cse8);
  vec2 _cse6 = df64_add(_cse11, _cse8);
  float _v0 = pow(10.0, (-u.zoom_exp));
  float _v1 = (vo.uv.x * 2.0);
  float _v2 = (_v1 - (_cse0 ? 0.0 : 1.0));
  float _v3 = ((_v2 - 0.5) * _v0);
  float _v4 = (((vo.uv.y - 0.5) * _v0) * ((u.resolution.y / u.resolution.x) * 2.0));
  bool _v5 = (_cse0 || (u.fp64 < 0.5));
  vec2 _lc0 = df64_add(_cse1, vec2(_v3, 0.0));
  vec2 _lc1 = df64_add(_cse2, vec2(_v4, 0.0));
  DF64Vec2 _v6 = DF64Vec2(vec2(_lc0.x, _lc1.x), vec2(_lc0.y, _lc1.y));
  vec2 _lc2 = df64_sub(df64_add(vec2(_v6.hi.x, _v6.lo.x), _cse8), _cse3);
  vec2 _lc3 = df64_sub(df64_add(vec2(_v6.hi.y, _v6.lo.y), _cse8), _cse4);
  vec2 _v7 = df64_sqrt(df64_add(df64_mul(_lc2, _lc2), df64_mul(_lc3, _lc3)));
  vec2 _lc4 = df64_sub(df64_add(vec2(_v6.hi.x, _v6.lo.x), _cse8), _cse5);
  vec2 _lc5 = df64_sub(df64_add(vec2(_v6.hi.y, _v6.lo.y), _cse8), _cse6);
  vec2 _v8 = df64_sqrt(df64_add(df64_mul(_lc4, _lc4), df64_mul(_lc5, _lc5)));
  float _v9 = df64_narrow(df64_fract(df64_mul(df64_sub(df64_add(_v7, _cse8), df64_add(_v8, _cse8)), vec2(0.25, 0.0))));
  float _v10 = df64_narrow(df64_fract(df64_mul(df64_add(_v7, _v8), vec2(0.0625, 0.0))));
  vec2 _v11 = vec2((df64_narrow(_cse1) + _v3), (df64_narrow(_cse2) + _v4));
  float _v12 = length((_v11 - vec2(df64_narrow(_cse7), df64_narrow(_cse9))));
  float _v13 = length((_v11 - vec2(df64_narrow(_cse10), df64_narrow(_cse11))));
  float _v14 = fract(((_v12 - _v13) * 0.25));
  float _v15 = fract(((_v12 + _v13) * 0.0625));
  float _v16 = (_v5 ? _v14 : _v9);
  float _v17 = (_v5 ? _v15 : _v10);
  float _v18 = min(_v16, (1.0 - _v16));
  float _v19 = min(_v17, (1.0 - _v17));
  float _v20 = ((fwidth(_v18) * 1.2) + 0.0001);
  float _v21 = ((fwidth(_v19) * 1.2) + 0.0001);
  float _v22 = (1.0 - smoothstep(0.0, _v20, _v18));
  float _v23 = (1.0 - smoothstep(0.0, _v21, _v19));
  vec3 _v24 = mix(vec3(0.02, 0.07, 0.13), vec3(0.04, 0.12, 0.2), vo.uv.y);
  return vec4((((_v24 + (vec3(0.0, 0.06, 0.08) * _v16)) + (vec3(0.25, 0.95, 0.95) * (_v22 * 0.9))) + (vec3(0.95, 0.7, 0.25) * (_v23 * 0.35))), 1.0);
}

void main() {
  VsOut vo;
  vo.pos = gl_FragCoord;
  vo.uv = uv;
  _ret = fs_loran_impl(vo);
}

{
  "bindGroups": [
    {
      "group": 0,
      "entries": [
        {
          "group": 0,
          "binding": 0,
          "name": "u",
          "space": "uniform",
          "resourceKind": "uniform-buffer",
          "structName": "Uniforms"
        }
      ]
    }
  ],
  "uniforms": [
    {
      "name": "Uniforms",
      "size": 64,
      "align": 16,
      "fields": [
        {
          "name": "center",
          "type": "vec2<f64>",
          "offset": 0,
          "align": 16,
          "size": 16
        },
        {
          "name": "st_a",
          "type": "vec2<f64>",
          "offset": 16,
          "align": 16,
          "size": 16
        },
        {
          "name": "st_b",
          "type": "vec2<f64>",
          "offset": 32,
          "align": 16,
          "size": 16
        },
        {
          "name": "resolution",
          "type": "vec2<f32>",
          "offset": 48,
          "align": 8,
          "size": 8
        },
        {
          "name": "zoom_exp",
          "type": "f32",
          "offset": 56,
          "align": 4,
          "size": 4
        },
        {
          "name": "fp64",
          "type": "f32",
          "offset": 60,
          "align": 4,
          "size": 4
        }
      ]
    }
  ],
  "storage": [],
  "entries": [
    {
      "name": "vs",
      "stage": "vertex",
      "inputs": [
        "u32"
      ],
      "output": "struct:VsOut"
    },
    {
      "name": "fs_loran",
      "stage": "fragment",
      "inputs": [
        "struct:VsOut"
      ],
      "output": "vec4<f32>"
    }
  ],
  "overrides": []
}