Backlog - WebGPU Branch Experiment

Code

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: #070b15;
  color: #edf4ff;
}
.topbar {
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar a {
  color: #8ee7ff;
  text-decoration: none;
}
button {
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  color: #edf4ff;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
}
main {
  width: min(980px, 92%);
  margin: 0 auto;
}
.kicker {
  color: #8ee7ff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
canvas {
  margin-top: 1rem;
  width: 100%;
  border: 1px solid #2a3f5f;
  border-radius: 12px;
  background: #0d1322;
}

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

const statusEl = document.getElementById("status");
const runBtn = document.getElementById("runBtn");
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

function fallbackRender(message) {
  const g = ctx.createLinearGradient(0, 0, canvas.width, canvas.height);
  g.addColorStop(0, "#1f2f55");
  g.addColorStop(1, "#553077");
  ctx.fillStyle = g;
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.fillStyle = "#e9f3ff";
  ctx.font = "700 24px Trebuchet MS";
  ctx.fillText("WebGPU Probe", 28, 48);
  ctx.font = "16px Trebuchet MS";
  ctx.fillText(message, 28, 80);
}

runBtn.addEventListener("click", async () => {
  if (!navigator.gpu) {
    statusEl.textContent = "WebGPU unavailable. Using fallback preview.";
    fallbackRender("navigator.gpu not found in this browser.");
    return;
  }

  try {
    const adapter = await navigator.gpu.requestAdapter();
    if (!adapter) {
      statusEl.textContent = "WebGPU adapter unavailable. Using fallback preview.";
      fallbackRender("No adapter returned by browser.");
      return;
    }

    const info = adapter.info ? await adapter.info : null;
    const label = info
      ? `${info.vendor || "vendor"} / ${info.architecture || "architecture"}`
      : "adapter detected";
    statusEl.textContent = `WebGPU available: ${label}`;
    fallbackRender(`WebGPU path detected (${label}). Extend this branch with render pipelines.`);
  } catch (error) {
    statusEl.textContent = "WebGPU probe failed. Using fallback preview.";
    fallbackRender(`Probe error: ${error.message}`);
  }
});

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>WebGPU Branch Experiment</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <header class="topbar">
      <a href="../">Back to demos</a>
      <button id="runBtn">Run Probe</button>
    </header>

    <main>
      <p class="kicker">Backlog 29</p>
      <h1>WebGPU Branch Experiment</h1>
      <p id="status">Press run to probe WebGPU support.</p>
      <canvas id="canvas" width="960" height="420"></canvas>
    </main>

    <script src="script.js"></script>
  </body>
</html>

Backlog - WebGPU Branch Experiment

WebGPU capability probe with fallback branch visualization.

Source

Repository: libs-gen
Original demo id: 29-webgpu-experiment

Notes

WebGPU capability probe with fallback branch visualization.