{
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  "sources": ["/cdn/shop/t/16/assets/lp-book-scene.js?x=1793824132886"],
  "sourcesContent": ["// Landing hero's 3D books (sections/lp-hero-scroll.liquid): a thin adapter\n// around the book3d scene module (assets/book-scene.js, synced by\n// .github/scripts/sync_book_scene.py). The page owns the copy, layout and\n// scrolling; the module owns the models, lighting, horizontal drag /\n// arrow-key orbit and the Proverbs opening.\n//\n// The scene mounts when the element connects and is disposed when it\n// disconnects, which covers theme-editor section load/unload and reorders.\n// Each mount gets a fresh canvas, since disposal releases its WebGL context.\n// The spines poster stays until the scene is drawn. If the scene fails to\n// load, or isn't drawn within REST_AFTER_MS of a mount (each remount gets its\n// own deadline), it is disposed and the resting poster (the covers, as the\n// reveal leaves them) replaces the spines for good (rest()). Without a\n// hardware GPU it never mounts: the resting poster comes in at once (see\n// hasFastWebGL). A rendering\n// failure after the scene was drawn (lost WebGL context, shader error) brings\n// the poster back and remounts; a failed Proverbs opening, which the module\n// reports with error.code 'opening', is retried on the next gesture. The\n// Proverbs opening downloads only when the visitor first turns right.\n//\n// Reveal: the scene opens on the spines, and its \"scroll progress\" (0..1)\n// turns them to the covers. The adapter plays that once, over REVEAL_MS, as\n// soon as the scene is drawn (progress fed linearly; the module eases it);\n// page scroll moves neither it nor the orbit. A remount mid-reveal continues\n// it. A swipe or arrow key takes over from the reveal (the module's manual\n// control).\nconst REVEAL_MS = 2500;\nconst REST_AFTER_MS = 10000;\n// The page's wording for the module's status codes ('ready' clears it).\nconst STATUS = {\n  loading: 'Loading the journals.',\n  opening: 'Opening Proverbs.',\n  ready: '',\n  'load-error': 'The journals couldn\u2019t load.',\n  'opening-error': 'Proverbs couldn\u2019t open. Turn it again to try once more.',\n};\n// The bundled arrangement with each layout's camera field of view narrowed by\n// that layout's zoom, which enlarges every view of the books (covers, spines\n// and the open Proverbs) without moving the camera.\nconst zoomed = (arrangement, zoom) => {\n  const copy = structuredClone(arrangement);\n  for (const [layout, factor] of Object.entries(zoom)) {\n    const camera = copy.layouts?.[layout]?.camera;\n    if (!camera || factor === 1) continue;\n    const half = (camera.fov * Math.PI) / 360;\n    camera.fov = (Math.atan(Math.tan(half) / factor) * 360) / Math.PI;\n  }\n  return copy;\n};\n// Whether WebGL draws on a GPU. With failIfMajorPerformanceCaveat the\n// browser refuses a context it would render in software (a blocklisted GPU,\n// hardware acceleration turned off, a virtual machine, headless test\n// browsers), where each of the scene's frames ties up the main thread for\n// seconds, and once it has drawn the 10 s deadline no longer applies:\n// measured 2026-11-04 in the\n// dev-checks Lighthouse runs, 4 of 6 landing loads hung and the rest spent\n// 175-232 s in book-scene.js. That flag only covers Chrome's fallback to\n// software, though: headless Chrome (Lighthouse, PageSpeed Insights, CI)\n// asks for SwiftShader outright (--use-angle=swiftshader-webgl) and gets a\n// context with no caveat, and each frame's commit then held the main thread\n// for ~3.6 s (dev-checks run 41866408032), so every landing load hung. So\n// the renderer is also named, and a software rasterizer counts as no GPU.\n// Asked once per page; the probe's context is released at once.\nconst SOFTWARE_RENDERER = /swiftshader|llvmpipe|lavapipe|softpipe|software|basic render driver/i;\nlet fastWebGL;\nconst hasFastWebGL = () => {\n  if (fastWebGL === undefined) {\n    let gl = null;\n    try {\n      gl = document.createElement('canvas').getContext('webgl2', { failIfMajorPerformanceCaveat: true });\n    } catch {\n      gl = null;\n    }\n    let renderer = '';\n    try {\n      const info = gl?.getExtension('WEBGL_debug_renderer_info');\n      renderer = String(gl?.getParameter(info ? info.UNMASKED_RENDERER_WEBGL : gl.RENDERER) || '');\n    } catch {\n      renderer = '';\n    }\n    fastWebGL = Boolean(gl) && !SOFTWARE_RENDERER.test(renderer);\n    gl?.getExtension('WEBGL_lose_context')?.loseContext();\n  }\n  return fastWebGL;\n};\nconst VIEWS = {\n  covers: 'Showing the covers.',\n  spines: 'Showing the spines.',\n  inside: 'Proverbs is open.',\n};\n\nif (!customElements.get('lp-book-scene')) {\n  customElements.define(\n    'lp-book-scene',\n    class LpBookScene extends HTMLElement {\n      connectedCallback() {\n        this.track = this.closest('.lp-hero');\n        this.stage = this.closest('.lp-hero__stage');\n        this.status = this.querySelector('[data-scene-status]');\n        if (!this.track || !this.stage || !this.dataset.module) return;\n\n        this.onPageHide = (event) => event.persisted && this.unmount();\n        this.onPageShow = (event) => event.persisted && this.mount();\n        window.addEventListener('pagehide', this.onPageHide);\n        window.addEventListener('pageshow', this.onPageShow);\n        this.mount();\n      }\n\n      // No scene from here on: dispose it, stop its downloads and cross-fade\n      // the spines to the resting poster once that has decoded (lp-hero-scroll.css,\n      // data-state=\"still\"); the spines stay if it can't load.\n      rest() {\n        if (this.resting) return;\n        this.resting = true;\n        this.unmount();\n        const picture = this.querySelector('template[data-scene-rest]')?.content.firstElementChild?.cloneNode(true);\n        if (!picture) return;\n        const image = picture.querySelector('img');\n        this.querySelector('.lp-scene__poster').after(picture);\n        image\n          .decode()\n          .then(() => {\n            if (this.resting) this.dataset.state = 'still';\n          })\n          .catch(() => picture.remove());\n      }\n\n      disconnectedCallback() {\n        this.unmount();\n        window.removeEventListener('pagehide', this.onPageHide);\n        window.removeEventListener('pageshow', this.onPageShow);\n      }\n\n      async mount() {\n        if (this.lifetime || this.resting) return;\n        if (!hasFastWebGL()) {\n          this.rest();\n          return;\n        }\n        const lifetime = (this.lifetime = new AbortController());\n        const { signal } = lifetime;\n        this.deadline = setTimeout(() => this.rest(), REST_AFTER_MS);\n\n        let mountBookScene;\n        let defaultArrangement;\n        try {\n          ({ mountBookScene, defaultArrangement } = await import(this.dataset.module));\n        } catch (error) {\n          if (!signal.aborted) this.fail(error);\n          return;\n        }\n        if (signal.aborted) return;\n\n        const canvas = document.createElement('canvas');\n        canvas.className = 'lp-scene__canvas';\n        canvas.tabIndex = 0;\n        canvas.setAttribute('aria-label', this.dataset.label || '');\n        this.querySelector('.lp-scene__canvas')?.remove();\n        this.prepend(canvas);\n        this.dataset.state = 'loading';\n\n        // The framing padding and zoom are set in lp-hero-scroll.css, which\n        // also sizes the poster by them.\n        const style = getComputedStyle(this);\n        const number = (name, fallback) => {\n          const value = parseFloat(style.getPropertyValue(name));\n          return Number.isFinite(value) ? value : fallback;\n        };\n        const framingPadding = { mobile: number('--lp-pad-mobile', 0.08), desktop: number('--lp-pad-desktop', 0.14) };\n        const zoom = { mobile: number('--lp-zoom-mobile', 1), desktop: number('--lp-zoom-desktop', 1) };\n\n        let openingFailed = false;\n        try {\n          this.scene = mountBookScene({\n            canvas,\n            manifestURL: this.dataset.manifest,\n            framingPadding,\n            arrangement: zoomed(defaultArrangement, zoom),\n            onReady: () => {\n              clearTimeout(this.deadline);\n              this.dataset.state = 'ready';\n              this.reveal();\n            },\n            onStatus: (text, code) => this.announce(STATUS[code] ?? text),\n            onView: (view) => this.announce(VIEWS[view] || ''),\n            onError: (error) => {\n              if (this.dataset.state !== 'ready') return this.fail(error);\n              // Proverbs' opening failed to prepare, but the closed scene\n              // still renders: retry it on the next gesture. Otherwise\n              // rendering itself failed ('context-lost', or 'shader', which\n              // stops the module drawing for good): back to the poster, then\n              // a fresh canvas.\n              if (error?.code === 'opening') {\n                openingFailed = true;\n                return;\n              }\n              this.restart(error);\n            },\n          });\n        } catch (error) {\n          this.fail(error);\n          return;\n        }\n        this.scene.ready.catch(() => {});\n\n        const retry = () => {\n          if (!openingFailed) return;\n          openingFailed = false;\n          this.scene.retryOpening().catch(() => {});\n        };\n        canvas.addEventListener('pointerdown', retry, { signal });\n        canvas.addEventListener(\n          'keydown',\n          (event) => ['ArrowLeft', 'ArrowRight', 'Home'].includes(event.key) && retry(),\n          { signal }\n        );\n\n        this.frame = 0;\n        this.reveal();\n      }\n\n\n      unmount() {\n        if (!this.lifetime) return;\n        this.lifetime.abort();\n        this.lifetime = null;\n        clearTimeout(this.deadline);\n        cancelAnimationFrame(this.frame);\n        this.frame = 0;\n        this.scene?.dispose();\n        this.scene = null;\n        this.querySelector('.lp-scene__canvas')?.remove();\n        delete this.dataset.state;\n      }\n\n      fail(error) {\n        console.error('Book scene:', error);\n        this.rest();\n      }\n\n      // Remount after a rendering failure, outside the module's callback.\n      // After two restarts the resting poster stays for good.\n      restart(error) {\n        console.error('Book scene:', error);\n        if (this.restarting) return;\n        this.restarting = true;\n        this.restarts = (this.restarts || 0) + 1;\n        delete this.dataset.state;\n        setTimeout(() => {\n          this.restarting = false;\n          this.unmount();\n          if (this.restarts > 2) this.rest();\n          else if (this.isConnected) this.mount();\n        });\n      }\n\n      announce(text) {\n        if (this.status) this.status.textContent = text;\n      }\n\n      // Feeds the reveal's progress each frame until it reaches 1, from the\n      // first time the scene is drawn (the clock survives a remount).\n      reveal() {\n        cancelAnimationFrame(this.frame);\n        this.frame = 0;\n        if (!this.scene || this.dataset.state !== 'ready') return;\n        this.revealClock ||= performance.now();\n        const tick = () => {\n          this.frame = 0;\n          const progress = Math.min(1, (performance.now() - this.revealClock) / REVEAL_MS);\n          this.scene?.setScrollProgress(progress);\n          if (progress < 1) this.frame = requestAnimationFrame(tick);\n        };\n        tick();\n      }\n    }\n  );\n}\n"],
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