/**
 * WGSL shaders for the IfcAnnotation overlay (fills + text labels).
 *
 * Two pipelines share this file because they ride the same camera uniform
 * layout and write into the same RGBA-blended pass. Splitting per-pipeline
 * would mean two near-identical vertex inputs and duplicate camera structs.
 */
export declare const SYMBOLIC_FILL_WGSL = "\nstruct Camera {\n  viewProj: mat4x4<f32>,\n};\n\n@group(0) @binding(0) var<uniform> camera: Camera;\n\nstruct VsIn {\n  @location(0) position: vec3<f32>,\n  @location(1) color:    vec4<f32>,\n};\n\nstruct VsOut {\n  @builtin(position) clipPos: vec4<f32>,\n  @location(0)        color:  vec4<f32>,\n};\n\n@vertex\nfn vs_main(in: VsIn) -> VsOut {\n  var out: VsOut;\n  out.clipPos = camera.viewProj * vec4<f32>(in.position, 1.0);\n  out.color   = in.color;\n  return out;\n}\n\n@fragment\nfn fs_main(in: VsOut) -> @location(0) vec4<f32> {\n  // Premultiply alpha so the standard \"src * 1 + dst * (1-src.a)\" blend\n  // produces the correct composite on top of the existing scene.\n  return vec4<f32>(in.color.rgb * in.color.a, in.color.a);\n}\n";
export declare const SYMBOLIC_TEXT_WGSL = "\nstruct Camera {\n  viewProj: mat4x4<f32>,\n  // x = viewport width in physical pixels, y = viewport height\n  // z = target glyph cap-height in screen pixels, w = padding\n  viewportAndTarget: vec4<f32>,\n  // Screen-aligned camera basis (world space). xyz = direction, w = padding.\n  // Used by billboarded glyphs (grid tags) so they always face the camera \u2014\n  // critical for top-down/ground views where world-up upAxis collapses to\n  // zero screen extent and the tag becomes invisible.\n  cameraRight: vec4<f32>,\n  cameraUp:    vec4<f32>,\n};\n\n@group(0) @binding(0) var<uniform> camera: Camera;\n@group(0) @binding(1) var atlasTex: texture_2d<f32>;\n@group(0) @binding(2) var atlasSamp: sampler;\n\n// Per-vertex (corner of the glyph quad).\nstruct VsIn {\n  // Bit-packed corner index 0..3. The vertex buffer is just [0u, 1u, 2u, 3u].\n  @location(0) corner: u32,\n};\n\n// Per-instance attributes \u2014 one record per glyph.\nstruct InstIn {\n  // World-space origin of the glyph (bottom-left, after alignment + rotation).\n  @location(1) origin: vec3<f32>,\n  // Right axis in world space \u2014 encodes both glyph width and baseline rotation.\n  @location(2) rightAxis: vec3<f32>,\n  // Up axis in world space \u2014 encodes glyph height and baseline rotation.\n  @location(3) upAxis: vec3<f32>,\n  // Atlas UV bounds: (u0, v0, u1, v1).\n  @location(4) uvBounds: vec4<f32>,\n  // Glyph tint (sRGB straight-alpha).\n  @location(5) color: vec4<f32>,\n  // Shared text-label anchor (every glyph in the same label uses the same\n  // anchor). Lets the shader compute one screen-space scale per label and\n  // apply it uniformly to every glyph offset so row spacing stays in sync.\n  @location(6) anchor: vec3<f32>,\n  // Authored cap height in world units. Same value for every glyph in the\n  // label; used to convert \"target pixels\" into a scale factor.\n  @location(7) capHeight: f32,\n  // Billboard flag (1.0 = use camera-aligned axes, 0.0 = use authored\n  // rightAxis/upAxis). Only the grid-tag emission path sets this to 1.0.\n  @location(8) billboard: f32,\n  // Per-glyph baseline-relative offset + size in WORLD units. Only used\n  // when billboard=1 (the authored origin bakes the offset along the\n  // floor-plane basis, which is the wrong direction for camera-aligned\n  // text). For non-billboard glyphs these are written too but the shader\n  // picks the authored path. World units = atlas-pixel * wScale.\n  //   .xy = (offsetX, offsetY) from anchor to glyph BL\n  //   .zw = (width, height) of the glyph quad\n  @location(9) glyphOffsetSize: vec4<f32>,\n  // Per-instance target cap height in screen pixels. 0 = fall back to\n  // the renderer global default (viewportAndTarget.z). Grid bubble\n  // glyphs override with a larger value so the bubble stays proportional\n  // to the tag at every zoom level.\n  @location(10) targetPxOverride: f32,\n};\n\nstruct VsOut {\n  @builtin(position) clipPos: vec4<f32>,\n  @location(0) uv:    vec2<f32>,\n  @location(1) color: vec4<f32>,\n};\n\n@vertex\nfn vs_main(in: VsIn, inst: InstIn) -> VsOut {\n  // Map corner index to (u, v) in [0, 1] \u2014 the four quad corners.\n  //   0 = bottom-left, 1 = bottom-right, 2 = top-left, 3 = top-right.\n  let u = f32((in.corner & 1u));      // 0,1,0,1\n  let v = f32((in.corner >> 1u) & 1u); // 0,0,1,1\n\n  // \u2500\u2500 Screen-space text scaling (projection-agnostic) \u2500\u2500\n  // For non-billboard glyphs measure world-Y \u2192 screen pixels (matches the\n  // authored upAxis convention). For billboard glyphs measure cameraUp \u2192\n  // screen pixels \u2014 that axis ALWAYS spans the full viewport height\n  // regardless of view angle, so screen-space scaling stays correct in\n  // top-down / ground / oblique views.\n  let isBillboard = inst.billboard > 0.5;\n  let scaleProbeAxis = select(vec3<f32>(0.0, 1.0, 0.0), camera.cameraUp.xyz, isBillboard);\n  let aClip = camera.viewProj * vec4<f32>(inst.anchor, 1.0);\n  let bClip = camera.viewProj * vec4<f32>(inst.anchor + scaleProbeAxis, 1.0);\n  let aNdc = aClip.xy / max(abs(aClip.w), 1e-4);\n  let bNdc = bClip.xy / max(abs(bClip.w), 1e-4);\n  let unitYPx = length(bNdc - aNdc) * camera.viewportAndTarget.y * 0.5;\n\n  let safeCap = max(inst.capHeight, 1e-4);\n  let currentPx = safeCap * unitYPx;\n  // Per-instance target overrides the uniform default (used by grid bubble\n  // glyphs to render at a larger on-screen size than the inscribed tag).\n  let targetPx = select(camera.viewportAndTarget.z, inst.targetPxOverride, inst.targetPxOverride > 0.0);\n  // Clamp to (0.02, 1.0]: never grow text beyond authored size; never\n  // shrink below ~2%.\n  let scale = clamp(\n    targetPx / max(currentPx, 1e-2),\n    0.02,\n    1.0,\n  );\n\n  // \u2500\u2500 Position the glyph quad in world space \u2500\u2500\n  // Non-billboard: authored axes (text lies in the floor plane of its\n  // annotation \u2014 IFC convention). Billboard: camera-aligned axes (text\n  // always faces the camera \u2014 grid-tag convention).\n  let authoredLocalOffset = inst.origin - inst.anchor;\n  let authoredWorldPos =\n      inst.anchor\n    + authoredLocalOffset * scale\n    + inst.rightAxis * scale * u\n    + inst.upAxis    * scale * v;\n\n  // Billboard: rebuild the quad in screen-aligned camera basis. glyphOffsetSize\n  // carries the same 2D atlas-pixel layout the upload computed, just in\n  // world units \u2014 re-project onto (cameraRight, cameraUp) so it tracks the\n  // viewer's eye in every orientation.\n  let bbOffsetX = inst.glyphOffsetSize.x;\n  let bbOffsetY = inst.glyphOffsetSize.y;\n  let bbWidth   = inst.glyphOffsetSize.z;\n  let bbHeight  = inst.glyphOffsetSize.w;\n  let billboardWorldPos =\n      inst.anchor\n    + (camera.cameraRight.xyz * bbOffsetX + camera.cameraUp.xyz * bbOffsetY) * scale\n    + (camera.cameraRight.xyz * bbWidth   * u\n     + camera.cameraUp.xyz    * bbHeight  * v) * scale;\n\n  let worldPos = select(authoredWorldPos, billboardWorldPos, isBillboard);\n\n  // UV: lerp atlas bounds. Note v inverted (atlas top is v=0).\n  let uMix = mix(inst.uvBounds.x, inst.uvBounds.z, u);\n  let vMix = mix(inst.uvBounds.w, inst.uvBounds.y, v);\n\n  var out: VsOut;\n  let clip = camera.viewProj * vec4<f32>(worldPos, 1.0);\n  // Reverse-Z decal nudge for text coplanar with model faces (issue #812\n  // follow-up: \"30\", \"1.49\" etc. flickering against the terrain). The\n  // pipeline-level depthBiasSlopeScale collapses to ~0 for billboard\n  // glyphs \u2014 the quad faces the camera, so depth slope across the quad\n  // is zero \u2014 leaving only a tiny -4 constant that MSAA jitter beats.\n  // Adding a small positive multiple of clip.w raises NDC z by a\n  // constant after the w-divide, which under reverse-Z reads as\n  // \"slightly closer\" \u2014 same trick the line pipeline uses.\n  out.clipPos = vec4<f32>(clip.x, clip.y, clip.z + 5e-5 * clip.w, clip.w);\n  out.uv      = vec2<f32>(uMix, vMix);\n  out.color   = inst.color;\n  return out;\n}\n\n@fragment\nfn fs_main(in: VsOut) -> @location(0) vec4<f32> {\n  let atlas = textureSample(atlasTex, atlasSamp, in.uv);\n  // The atlas was rasterised with white glyphs on a transparent background,\n  // so atlas.r is the coverage and atlas.a is the alpha. Multiply by the\n  // per-glyph tint and premultiply for the standard composite.\n  let alpha = atlas.a * in.color.a;\n  return vec4<f32>(in.color.rgb * alpha, alpha);\n}\n";
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