Start texture-space book renderer

public/js/book-page-format-module.js

@@ -0,0 +1,90 @@
+/**
+ * Book Page Format Module
+ * Defines the canonical page geometry used by the WebGL book renderer.
+ */
+import { BaseModule } from './base-module.js';
+
+class BookPageFormatModule extends BaseModule {
+    constructor() {
+        super('book-page-format', 'Book Page Format');
+        this.dependencies = [];
+        this.format = Object.freeze({
+            id: 'us-mass-market-hardcover',
+            trim: Object.freeze({
+                widthIn: 4.25,
+                heightIn: 6.375
+            }),
+            margins: Object.freeze({
+                topIn: 0.46,
+                bottomIn: 0.58,
+                innerIn: 0.68,
+                outerIn: 0.46
+            }),
+            typography: Object.freeze({
+                fontFamily: '"EB Garamond", "EB Garamond 12", serif',
+                bodyFontSizePt: 10.8,
+                lineHeightPt: 14.9,
+                headingFontSizePt: 13.2,
+                dropCapLines: 2
+            })
+        });
+
+        this.bindMethods([
+            'getFormat',
+            'getAspectRatio',
+            'getTextureMetrics',
+            'inchesToTexture'
+        ]);
+    }
+
+    async initialize() {
+        this.reportProgress(100, 'Book page format ready');
+        return true;
+    }
+
+    getFormat() {
+        return this.format;
+    }
+
+    getAspectRatio() {
+        return this.format.trim.widthIn / this.format.trim.heightIn;
+    }
+
+    inchesToTexture(valueIn, textureHeight) {
+        return (Number(valueIn) / this.format.trim.heightIn) * textureHeight;
+    }
+
+    getTextureMetrics(textureWidth = 1280) {
+        const width = Math.max(1, Math.round(Number(textureWidth) || 1280));
+        const height = Math.round(width / this.getAspectRatio());
+        const margins = {
+            top: this.inchesToTexture(this.format.margins.topIn, height),
+            bottom: this.inchesToTexture(this.format.margins.bottomIn, height),
+            inner: this.inchesToTexture(this.format.margins.innerIn, height),
+            outer: this.inchesToTexture(this.format.margins.outerIn, height)
+        };
+        return {
+            width,
+            height,
+            aspectRatio: this.getAspectRatio(),
+            margins,
+            content: {
+                x: margins.outer,
+                y: margins.top,
+                width: Math.max(1, width - margins.outer - margins.inner),
+                height: Math.max(1, height - margins.top - margins.bottom)
+            },
+            typography: this.format.typography
+        };
+    }
+}
+
+const bookPageFormat = new BookPageFormatModule();
+
+export { bookPageFormat as BookPageFormat };
+
+if (window.moduleRegistry) {
+    window.moduleRegistry.register(bookPageFormat);
+}
+
+window.BookPageFormat = bookPageFormat;

public/js/book-texture-renderer-module.js

@@ -0,0 +1,139 @@
+/**
+ * Book Texture Renderer Module
+ * Draws the virtual book pages directly into texture-space canvases.
+ */
+import { BaseModule } from './base-module.js';
+
+class BookTextureRendererModule extends BaseModule {
+    constructor() {
+        super('book-texture-renderer', 'Book Texture Renderer');
+        this.dependencies = ['book-page-format', 'localization'];
+        this.pageFormat = null;
+        this.localization = null;
+        this.metrics = null;
+        this.canvases = {
+            left: null,
+            right: null
+        };
+        this.contexts = {
+            left: null,
+            right: null
+        };
+        this.hitMaps = {
+            left: [],
+            right: []
+        };
+
+        this.bindMethods([
+            'initialize',
+            'createPageCanvases',
+            'drawEmptySpread',
+            'drawPageBase',
+            'drawDebugText',
+            'publishSpread',
+            'getPageCanvas',
+            'getHitMap',
+            'handleSceneReady'
+        ]);
+    }
+
+    async initialize() {
+        this.pageFormat = this.getModule('book-page-format');
+        this.localization = this.getModule('localization');
+        this.reportProgress(20, 'Preparing page texture canvases');
+        this.createPageCanvases();
+        this.drawEmptySpread();
+        this.addEventListener(document, 'webgl-book:scene-ready', this.handleSceneReady);
+        this.reportProgress(100, 'Book texture renderer ready');
+        return true;
+    }
+
+    createPageCanvases(textureWidth = 1280) {
+        this.metrics = this.pageFormat.getTextureMetrics(textureWidth);
+        ['left', 'right'].forEach((side) => {
+            const canvas = document.createElement('canvas');
+            canvas.width = this.metrics.width;
+            canvas.height = this.metrics.height;
+            this.canvases[side] = canvas;
+            this.contexts[side] = canvas.getContext('2d');
+        });
+    }
+
+    drawEmptySpread() {
+        this.drawPageBase('left');
+        this.drawPageBase('right');
+        this.drawDebugText('right', 'Book canvas renderer ready');
+        this.publishSpread();
+    }
+
+    drawPageBase(side) {
+        const canvas = this.canvases[side];
+        const ctx = this.contexts[side];
+        if (!canvas || !ctx) return;
+
+        ctx.clearRect(0, 0, canvas.width, canvas.height);
+        ctx.fillStyle = '#fff7dc';
+        ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+        const shade = ctx.createLinearGradient(0, 0, canvas.width, 0);
+        if (side === 'left') {
+            shade.addColorStop(0, 'rgba(255, 255, 255, 0.10)');
+            shade.addColorStop(0.78, 'rgba(255, 255, 255, 0)');
+            shade.addColorStop(1, 'rgba(82, 42, 14, 0.16)');
+        } else {
+            shade.addColorStop(0, 'rgba(82, 42, 14, 0.16)');
+            shade.addColorStop(0.22, 'rgba(255, 255, 255, 0)');
+            shade.addColorStop(1, 'rgba(255, 255, 255, 0.10)');
+        }
+        ctx.fillStyle = shade;
+        ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+        this.hitMaps[side] = [];
+    }
+
+    drawDebugText(side, text) {
+        const ctx = this.contexts[side];
+        const metrics = this.metrics;
+        if (!ctx || !metrics) return;
+
+        ctx.save();
+        ctx.fillStyle = 'rgba(31, 19, 10, 0.82)';
+        ctx.font = `${Math.round(metrics.typography.bodyFontSizePt * 1.55)}px ${metrics.typography.fontFamily}`;
+        ctx.textBaseline = 'alphabetic';
+        ctx.fillText(String(text || ''), metrics.content.x, metrics.content.y + 44);
+        ctx.restore();
+    }
+
+    publishSpread() {
+        document.dispatchEvent(new CustomEvent('webgl-book:page-canvases', {
+            detail: {
+                left: this.canvases.left,
+                right: this.canvases.right,
+                metrics: this.metrics,
+                hitMaps: this.hitMaps
+            }
+        }));
+    }
+
+    getPageCanvas(side) {
+        return this.canvases[side] || null;
+    }
+
+    getHitMap(side) {
+        return this.hitMaps[side] || [];
+    }
+
+    handleSceneReady() {
+        this.publishSpread();
+    }
+}
+
+const bookTextureRenderer = new BookTextureRendererModule();
+
+export { bookTextureRenderer as BookTextureRenderer };
+
+if (window.moduleRegistry) {
+    window.moduleRegistry.register(bookTextureRenderer);
+}
+
+window.BookTextureRenderer = bookTextureRenderer;

public/js/loader.js

@@ -24,7 +24,7 @@ const ModuleState = {
     ERROR: 'ERROR'
 };
 
-const MODULE_CACHE_BUSTER = '20260606-webgl-direct-page-crop-coords';
+const MODULE_CACHE_BUSTER = '20260606-webgl-texture-renderer-foundation';
 window.MODULE_CACHE_BUSTER = MODULE_CACHE_BUSTER;
 
 /**
@@ -113,6 +113,8 @@ const ModuleLoader = (function() {
             { id: 'paragraph-layout', script: '/js/paragraph-layout-module.js', weight: 17 },
             { id: 'sentence-queue', script: '/js/sentence-queue-module.js', weight: 12 },
             { id: 'layout-renderer', script: '/js/layout-renderer-module.js', weight: 13 }, // Add Layout Renderer module
+            { id: 'book-page-format', script: '/js/book-page-format-module.js', weight: 4 },
+            { id: 'book-texture-renderer', script: '/js/book-texture-renderer-module.js', weight: 6 },
             { id: 'webgl-book-scene', script: '/js/webgl-book-scene-module.js', weight: 13 },
             { id: 'animation-queue', script: '/js/animation-queue-module.js', weight: 12 },
             { id: 'playback-coordinator', script: '/js/playback-coordinator-module.js', weight: 8 }, // Synchronizes animation + TTS

public/js/procedural-book-model.js

@@ -6,7 +6,7 @@ export const PROCEDURAL_BOOK = {
     PAGE_COUNT_STEP: 10,
     PAGE_LINE_SEGMENTS: 48,
     PAGE_DEPTH: 2.24,
-    PAGE_WIDTH: 2.24 * 0.806,
+    PAGE_WIDTH: 2.24 * 2 / 3,
     COVER_DEPTH: 2.30,
     OPEN_SEAM_GAP: 0.003,
     PROFILE: {

public/js/webgl-book-lab.js

@@ -4,7 +4,7 @@ import { RenderPass } from 'https://esm.sh/three@0.165.0/examples/jsm/postproces
 import { SSAOPass } from 'https://esm.sh/three@0.165.0/examples/jsm/postprocessing/SSAOPass.js';
 import { SMAAPass } from 'https://esm.sh/three@0.165.0/examples/jsm/postprocessing/SMAAPass.js';
 import { OutputPass } from 'https://esm.sh/three@0.165.0/examples/jsm/postprocessing/OutputPass.js';
-import { PROCEDURAL_BOOK, createProceduralBookModel, snapProceduralPageCount } from './procedural-book-model.js?v=20260606-webgl-no-menu-offscreen-dom';
+import { PROCEDURAL_BOOK, createProceduralBookModel, snapProceduralPageCount } from './procedural-book-model.js?v=20260606-book-page-format-restore';
 
 const canvas = document.getElementById('scene');
 canvas.style.cursor = 'grab';
@@ -25,9 +25,6 @@ const appInitialState = window.WebGLBookInitialState || {};
 const tableDebugName = urlParams.get('tableDebug') || 'none';
 const tableDebugMode = tableDebugModes[tableDebugName] ?? tableDebugModes.none;
 const isAppIntegrationMode = appInitialState.appMode === true;
-const html2CanvasPromise = isAppIntegrationMode
-    ? import('https://esm.sh/html2canvas@1.4.1')
-    : null;
 const labStatus = document.getElementById('lab_status');
 if (labStatus && tableDebugMode !== tableDebugModes.none) {
     labStatus.textContent = tableDebugName === 'ao' ? 'scene debug: SSAO' : `table debug: ${tableDebugName}`;
@@ -44,13 +41,9 @@ const generatedTextureCanvases = {};
 const maxTextureAnisotropy = renderer.capabilities.getMaxAnisotropy();
 const reflectionPixelRatio = Math.min(window.devicePixelRatio || 1, 2);
 const pageTextureWidth = isAppIntegrationMode ? 1280 : 3200;
-const appPageTextureInset = 0;
 const reflectionTargetSize = new THREE.Vector2();
 const pageRaycaster = new THREE.Raycaster();
 const pointerNdc = new THREE.Vector2();
-let pageTextureRenderSerial = 0;
-let pageTextureRenderInProgress = false;
-let pageTextureRenderPending = false;
 let sceneComposerTarget = null;
 let composer = null;
 let sceneRenderPass = null;
@@ -402,14 +395,13 @@ window.BookLabDebug = {
         return bookPageCount;
     },
     redrawPageTextures() {
-        redrawPageTexturesFromDom();
+        window.BookTextureRenderer?.publishSpread?.();
         return true;
     },
     getTextureInfo() {
         return {
             pageTextureWidth,
             pageTextureHeight: leftCanvas.height,
-            appPageTextureInset,
             debug: getPageTextureDebugState()
         };
     },
@@ -424,10 +416,11 @@ window.BookLabDebug = {
 };
 
 window.addEventListener('resize', resize);
-document.addEventListener('webgl-book:redraw-pages', redrawPageTexturesFromDom);
+document.addEventListener('webgl-book:page-canvases', handlePageCanvases);
 installBookControls();
 installCameraControls();
 resize();
+document.dispatchEvent(new CustomEvent('webgl-book:scene-ready'));
 animate();
 
 function buildTable() {
@@ -1444,35 +1437,24 @@ function syncBookControls() {
     if (fastForwardButton) fastForwardButton.disabled = busy || !canPageFlip(1);
 }
 
-function redrawPageTexturesFromDom() {
+function handlePageCanvases(event) {
-    if (pageTextureRenderInProgress) {
+    const detail = event.detail || {};
-        pageTextureRenderPending = true;
+    if (detail.left) {
-        return;
+        drawCanvasPageTexture(leftCanvas, detail.left, 'left');
-    }
-    const leftSource = document.getElementById('page_left');
-    const rightSource = document.getElementById('page_right');
-    if (!leftSource && !rightSource) return;
-    pageTextureRenderInProgress = true;
-    const serial = ++pageTextureRenderSerial;
-    (async () => {
-        try {
-            if (leftSource && await drawDomPageTexture(leftCanvas, leftSource, 'left')) {
         leftTexture.needsUpdate = true;
     }
-            if (rightSource && await drawDomPageTexture(rightCanvas, rightSource, 'right')) {
+    if (detail.right) {
+        drawCanvasPageTexture(rightCanvas, detail.right, 'right');
         rightTexture.needsUpdate = true;
     }
-        } finally {
+    document.documentElement.dataset.webglPageTextureMetrics = JSON.stringify({
-            pageTextureRenderInProgress = false;
+        width: leftCanvas.width,
-            if (pageTextureRenderPending && serial === pageTextureRenderSerial) {
+        height: leftCanvas.height,
-                pageTextureRenderPending = false;
+        source: 'book-texture-renderer'
-                redrawPageTexturesFromDom();
+    });
-            }
-        }
-    })();
 }
 
-async function drawDomPageTexture(canvas, source, side) {
+function drawCanvasPageTexture(canvas, sourceCanvas, side) {
     const ctx = canvas.getContext('2d');
     ctx.fillStyle = '#fffaf0';
     ctx.fillRect(0, 0, canvas.width, canvas.height);
@@ -1484,9 +1466,9 @@ async function drawDomPageTexture(canvas, source, side) {
     ctx.fillStyle = shade;
     ctx.fillRect(0, 0, canvas.width, canvas.height);
 
-    const painted = await paintRasterizedDomPage(ctx, canvas, source);
+    ctx.drawImage(sourceCanvas, 0, 0, canvas.width, canvas.height);
-    updatePageTextureDebugState(side, canvas, source, painted);
+    updatePageTextureDebugState(side, canvas, sourceCanvas, true);
-    return painted;
+    return true;
 }
 
 function getPageTextureDebugState() {
@@ -1505,8 +1487,8 @@ function updatePageTextureDebugState(side, canvas, source, painted) {
         painted,
         width: canvas.width,
         height: canvas.height,
-        sourceId: source.id || '',
+        sourceId: source?.id || 'book-texture-renderer',
-        sourceTextLength: source.textContent?.trim().length || 0,
+        sourceTextLength: 0,
         darkPixels: countPageTextureDarkPixels(canvas)
     };
     document.documentElement.dataset.webglPageTextures = JSON.stringify(state);
@@ -1530,56 +1512,6 @@ function countPageTextureDarkPixels(canvas) {
     return darkPixels;
 }
 
-async function paintRasterizedDomPage(ctx, canvas, source) {
-    const pageRect = source.getBoundingClientRect();
-    if (pageRect.width <= 0 || pageRect.height <= 0) return false;
-    const captured = await captureDomPageWithHtml2Canvas(source, pageRect, canvas);
-    if (captured) {
-        drawCapturedPageCanvas(ctx, canvas, captured);
-        return true;
-    }
-    return false;
-}
-
-async function captureDomPageWithHtml2Canvas(source, pageRect, targetCanvas) {
-    if (!html2CanvasPromise) return null;
-    try {
-        const module = await html2CanvasPromise;
-        const html2canvas = module.default || module;
-        return await html2canvas(source, {
-            backgroundColor: null,
-            logging: false,
-            useCORS: true,
-            allowTaint: false,
-            foreignObjectRendering: true,
-            x: pageRect.left,
-            y: pageRect.top,
-            width: pageRect.width,
-            height: pageRect.height,
-            scrollX: 0,
-            scrollY: 0,
-            windowWidth: Math.ceil(Math.max(window.innerWidth, pageRect.right)),
-            windowHeight: Math.ceil(Math.max(window.innerHeight, pageRect.bottom)),
-            scale: Math.max(1, targetCanvas.width / pageRect.width)
-        });
-    } catch (error) {
-        document.documentElement.dataset.webglLastCaptureError = error?.message || String(error);
-        return null;
-    }
-}
-
-function drawCapturedPageCanvas(ctx, canvas, captured) {
-    const insetX = canvas.width * appPageTextureInset;
-    const insetY = canvas.height * appPageTextureInset * 0.35;
-    ctx.drawImage(
-        captured,
-        insetX,
-        insetY,
-        canvas.width - insetX * 2,
-        canvas.height - insetY * 2
-    );
-}
-
 function projectPointerToPage(clientX, clientY) {
     const rect = canvas.getBoundingClientRect();
     if (rect.width <= 0 || rect.height <= 0) return null;
@@ -1592,10 +1524,8 @@ function projectPointerToPage(clientX, clientY) {
     for (const hit of intersections) {
         const pageSide = textureHitPageSide(hit);
         if (!pageSide || !hit.uv) continue;
-        const insetX = appPageTextureInset;
+        const mappedX = THREE.MathUtils.clamp(hit.uv.x, 0, 1);
-        const insetY = appPageTextureInset * 0.35;
+        const mappedY = 1 - THREE.MathUtils.clamp(hit.uv.y, 0, 1);
-        const mappedX = THREE.MathUtils.clamp((hit.uv.x - insetX) / Math.max(0.001, 1 - insetX * 2), 0, 1);
-        const mappedY = 1 - THREE.MathUtils.clamp((hit.uv.y - insetY) / Math.max(0.001, 1 - insetY * 2), 0, 1);
         return {
             pageId: pageSide === 'left' ? 'page_left' : 'page_right',
             x: mappedX,

public/js/webgl-book-scene-module.js

@@ -439,7 +439,6 @@ class WebGLBookSceneModule extends BaseModule {
     triggerTextureRefresh() {
         clearTimeout(this.textureRefreshTimer);
         this.textureRefreshTimer = setTimeout(() => {
-            document.dispatchEvent(new CustomEvent('webgl-book:redraw-pages'));
             window.BookLabDebug?.redrawPageTextures?.();
         }, 60);
     }
@@ -463,7 +462,6 @@ class WebGLBookSceneModule extends BaseModule {
             }
             if (now - this.lastAnimatedTextureRefresh > 100) {
                 this.lastAnimatedTextureRefresh = now;
-                document.dispatchEvent(new CustomEvent('webgl-book:redraw-pages'));
                 window.BookLabDebug?.redrawPageTextures?.();
             }
             this.textureRefreshAnimationId = window.requestAnimationFrame(tick);