export declare const GRID_VERTEX_SHADER = "\nstruct Uniforms {\n  viewProjection: mat4x4<f32>,\n  cameraPos: vec3<f32>,\n};\n@group(0) @binding(0) var<uniform> u: Uniforms;\n\nstruct VOut {\n  @builtin(position) position: vec4<f32>,\n  @location(0) worldPos: vec3<f32>,\n};\n\n// Full-screen XZ quad, large enough for visible grid\nconst EXTENT = 500.0;\nconst positions = array<vec2<f32>, 6>(\n  vec2<f32>(-1, -1), vec2<f32>(1, -1), vec2<f32>(1, 1),\n  vec2<f32>(-1, -1), vec2<f32>(1, 1), vec2<f32>(-1, 1),\n);\n\n@vertex fn vs(@builtin(vertex_index) vi: u32) -> VOut {\n  let p = positions[vi];\n  let worldPos = vec3<f32>(u.cameraPos.x + p.x * EXTENT, 0.0, u.cameraPos.z + p.y * EXTENT);\n  var out: VOut;\n  out.position = u.viewProjection * vec4<f32>(worldPos, 1.0);\n  out.worldPos = worldPos;\n  return out;\n}\n";
export declare const GRID_FRAGMENT_SHADER = "\nstruct Uniforms {\n  viewProjection: mat4x4<f32>,\n  cameraPos: vec3<f32>,\n};\n@group(0) @binding(0) var<uniform> u: Uniforms;\n\nstruct FIn {\n  @location(0) worldPos: vec3<f32>,\n};\n\nfn gridLine(coord: f32, scale: f32) -> f32 {\n  let d = fract(coord / scale + 0.5) - 0.5;\n  let deriv = fwidth(coord / scale);\n  return 1.0 - smoothstep(-deriv, deriv, abs(d) - deriv);\n}\n\n@fragment fn fs(input: FIn) -> @location(0) vec4<f32> {\n  let dist = length(input.worldPos.xz - u.cameraPos.xz);\n\n  // Minor grid (1m)\n  let minorX = gridLine(input.worldPos.x, 1.0);\n  let minorZ = gridLine(input.worldPos.z, 1.0);\n  let minor = max(minorX, minorZ);\n\n  // Major grid (10m)\n  let majorX = gridLine(input.worldPos.x, 10.0);\n  let majorZ = gridLine(input.worldPos.z, 10.0);\n  let major = max(majorX, majorZ);\n\n  // Axis lines (each uses its own fwidth for correct perspective scaling)\n  let xAxisWidth = fwidth(input.worldPos.z) * 1.5;\n  let xAxis = 1.0 - smoothstep(0.0, xAxisWidth, abs(input.worldPos.z));\n  let zAxisWidth = fwidth(input.worldPos.x) * 1.5;\n  let zAxis = 1.0 - smoothstep(0.0, zAxisWidth, abs(input.worldPos.x));\n\n  // Base grid color\n  var color = vec3<f32>(0.3, 0.3, 0.3);\n  var alpha = minor * 0.15 + major * 0.25;\n\n  // X-axis = red, Z-axis = blue\n  if (xAxis > 0.01) {\n    color = mix(color, vec3<f32>(0.8, 0.2, 0.2), xAxis);\n    alpha = max(alpha, xAxis * 0.8);\n  }\n  if (zAxis > 0.01) {\n    color = mix(color, vec3<f32>(0.2, 0.2, 0.8), zAxis);\n    alpha = max(alpha, zAxis * 0.8);\n  }\n\n  // Fade with distance\n  let fadeStart = 50.0;\n  let fadeEnd = 200.0;\n  let fade = 1.0 - smoothstep(fadeStart, fadeEnd, dist);\n  alpha *= fade;\n\n  if (alpha < 0.001) { discard; }\n  return vec4<f32>(color, alpha);\n}\n";
//# sourceMappingURL=grid-shader.d.ts.map