stats-gl/worker.html at main · RenaudRohlinger/stats-gl · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Stats-GL - Worker Texture Demo</title>
    <link rel="help" href="/llms.txt" type="text/plain" title="LLM Instructions">
    <style>
      body {
        margin: 0;
        overflow: hidden;
        background: #111;
        font-family: system-ui, -apple-system, sans-serif;
      }
      .code-overlay {
        position: absolute;
        bottom: 0;
        left: 0;
        padding: 14px;
        background-color: #1e1e1ef8;
        color: #d4d4d4;
        overflow: auto;
        margin: 0;
        font-family: 'Courier New', Courier, monospace;
        @media screen and (max-width: 608px) {
          display: none;
        }
      }
      .nav-tabs {
        display: flex;
        gap: 1px;
        margin-top: -14px;
        position: absolute;
        right: 0;
        margin-bottom: 14px;
        font-family: system-ui, -apple-system, sans-serif;
      }
      .nav-tab {
        background: #1e1e1ef8;
        color: #d4d4d4;
        padding: 4px 8px;
        text-decoration: none;
        font-size: 12px;
        transition: background-color 0.2s;
      }
      .nav-tab:hover {
        background: #3d3d3d;
      }
      .nav-tab.active {
        background: #3d3d3d;
      }
      pre {
        margin: 0;
      }
      .keyword {
        color: #569cd6;
      }
      .comment {
        color: #6a9955;
      }
      .string {
        color: #ce9178;
      }
      ::selection {
        background: #264f78;
      }

      #footer {
        position: absolute;
        bottom: 0;
        right: 0;
        color: #fff;
        font-size: 14px;
        padding: 14px;
        text-align: right;
        background-color: #1e1e1ef8;
      }
      #footer a {
        color: #fff;
        font-weight: bold;
        text-decoration: none;
      }

      #render-canvas {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 512px;
        height: 512px;
        display: none;
      }
      #render-canvas.visible {
        display: block;
      }

      .controls {
        position: absolute;
        top: 10px;
        right: 10px;
        display: flex;
        gap: 8px;
        z-index: 100;
      }
      .controls button {
        background: #333;
        color: #fff;
        border: none;
        padding: 8px 12px;
        cursor: pointer;
        font-size: 12px;
      }
      .controls button:hover {
        background: #555;
      }
      #stress-main {
        background: #2d5a2d;
      }
      #stress-main:hover {
        background: #3d7a3d;
      }
      #stress-main.active {
        opacity: 0.6;
      }
      #stress-worker {
        background: #8a5a2d;
      }
      #stress-worker:hover {
        background: #aa6a3d;
      }
      #stress-worker.active {
        opacity: 0.6;
      }

      .info {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        color: #666;
        font-size: 14px;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <canvas id="render-canvas" width="512" height="512"></canvas>

    <div class="controls">
      <button id="stress-main">Stress Main</button>
      <button id="stress-worker">Stress Worker</button>
      <button id="toggle-btn">Show Canvas</button>
    </div>

    <div class="info" id="info-text">
      Rendering in OffscreenCanvas worker<br>
      Texture previews transferred via ImageBitmap
    </div>

    <div class="code-overlay">
      <div class="nav-tabs">
        <a href="/" class="nav-tab">Three.js</a>
        <a href="/webgl.html" class="nav-tab">WebGL</a>
        <a href="/webgpu.html" class="nav-tab">WebGPU</a>
        <a href="/worker.html" class="nav-tab active">Worker</a>
        <a href="/worker_tsl.html" class="nav-tab">Worker TSL</a>
      </div>
      <pre>
<span class="comment">// Worker Texture Demo</span>
<span class="comment">// Textures captured in worker, transferred to main</span>

<span class="comment">// Worker side:</span>
<span class="keyword">const</span> bitmap = <span class="keyword">await</span> profiler.captureTexture({
    framebuffer, width, height
});
postMessage(
    { type: <span class="string">'texture'</span>, name, bitmap, width, height },
    [bitmap] <span class="comment">// Transferable</span>
);

<span class="comment">// Main thread:</span>
worker.onmessage = (e) => {
    <span class="keyword">if</span> (e.data.type === <span class="string">'texture'</span>) {
        stats.setTextureBitmap(
            e.data.name,
            e.data.bitmap,
            e.data.width,
            e.data.height
        );
    }
};</pre>
    </div>

    <div id="footer">
      Made with love by
      <a href="https://twitter.com/onirenaud" target="_blank">@onirenaud</a>
      -
      <a href="https://twitter.com/utsuboco" target="_blank">@utsuboco</a>
    </div>

    <script type="module">
      import Stats from './dist/main.js';

      // Initialize stats (no canvas - worker handles rendering)
      const stats = new Stats({ trackGPU: true, trackHz: true });
      document.body.appendChild(stats.dom);

      // Create texture preview panels
      stats.addTexturePanel('Color');
      stats.addTexturePanel('Luma');

      // Get canvas and transfer control to offscreen
      const canvas = document.getElementById('render-canvas');
      const offscreen = canvas.transferControlToOffscreen();

      // Toggle canvas visibility (visible by default)
      const toggleBtn = document.getElementById('toggle-btn');
      const infoText = document.getElementById('info-text');
      let canvasVisible = true;
      canvas.classList.add('visible');
      infoText.style.display = 'none';
      toggleBtn.textContent = 'Hide Canvas';

      toggleBtn.addEventListener('click', () => {
        canvasVisible = !canvasVisible;
        canvas.classList.toggle('visible', canvasVisible);
        infoText.style.display = canvasVisible ? 'none' : 'block';
        toggleBtn.textContent = canvasVisible ? 'Hide Canvas' : 'Show Canvas';
      });

      // Stress test state
      let stressMain = false;
      let stressWorkerFlag = false;

      // Heavy computation function (1M iterations)
      // Note: We assign to window to prevent tree-shaking
      function heavyComputation() {
        let result = 0;
        for (let i = 0; i < 1000000; i++) {
          result += Math.sqrt(i) * Math.sin(i);
        }
        window.__stressResult = result;
      }

      // Stress buttons
      const stressMainBtn = document.getElementById('stress-main');
      const stressWorkerBtn = document.getElementById('stress-worker');

      stressMainBtn.addEventListener('click', () => {
        stressMain = !stressMain;
        stressMainBtn.classList.toggle('active', stressMain);
        stressMainBtn.textContent = stressMain ? 'Stop Main' : 'Stress Main';
      });

      stressWorkerBtn.addEventListener('click', () => {
        stressWorkerFlag = !stressWorkerFlag;
        stressWorkerBtn.classList.toggle('active', stressWorkerFlag);
        stressWorkerBtn.textContent = stressWorkerFlag ? 'Stop Worker' : 'Stress Worker';
        worker.postMessage({ type: 'stress', enabled: stressWorkerFlag });
      });

      // Create worker
      const worker = new Worker(
        new URL('./demo/worker.js', import.meta.url),
        { type: 'module' }
      );

      // Handle messages from worker
      worker.onmessage = (e) => {
        const { type, data, name, bitmap, width, height } = e.data;

        if (type === 'stats') {
          // Update stats from worker data (don't call update here, main loop handles it)
          stats.setData(data);
        } else if (type === 'texture') {
          // Update texture panel with transferred bitmap
          stats.setTextureBitmap(name, bitmap, width, height);
        }
      };

      // Transfer canvas to worker
      worker.postMessage({ type: 'init', canvas: offscreen }, [offscreen]);

      // Main thread loop for stress test
      function mainLoop() {
        stats.begin();
        if (stressMain) {
          heavyComputation();
        }
        stats.update();
        requestAnimationFrame(mainLoop);
      }
      mainLoop();
    </script>
  </body>
</html>