s30/main.html at main · benprew/s30 · 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">
  <title>Shandalar 30</title>
  <style>
    html,
    body {
      width: 100%;
      height: 100%;
      margin: 0;
      background: #111;
      color: #fff;
      font-family: sans-serif;
    }

    #loader {
      position: fixed;
      inset: 0;
      display: grid;
      place-content: center;
      gap: 12px;
      text-align: center;
    }

    progress {
      width: 320px;
      height: 20px;
    }
  </style>
</head>
<body>
  <div id="loader">
    <div id="status">Downloading game…</div>
    <progress id="progress" max="100"></progress>
    <div id="downloaded"></div>
  </div>

  <script src="wasm_exec.js"></script>
  <script>
    async function start() {
      const status = document.getElementById("status");
      const progress = document.getElementById("progress");
      const downloaded = document.getElementById("downloaded");

      try {
        const response = await fetch("s30.wasm");
        if (!response.ok) {
          throw new Error(`HTTP ${response.status}`);
        }

        const total = Number(response.headers.get("Content-Length"));
        const reader = response.body.getReader();
        const chunks = [];
        let received = 0;

        while (true) {
          const {done, value} = await reader.read();
          if (done) {
            break;
          }

          chunks.push(value);
          received += value.length;

          if (total) {
            const percent = Math.min(100, received / total * 100);
            progress.value = percent;
            downloaded.textContent = `${Math.round(percent)}%`;
          } else {
            progress.removeAttribute("value");
            downloaded.textContent = `${(received / 1024 / 1024).toFixed(1)} MB`;
          }
        }

        status.textContent = "Starting game…";
        progress.value = 100;
        downloaded.textContent = "";

        const wasm = new Uint8Array(received);
        let offset = 0;
        for (const chunk of chunks) {
          wasm.set(chunk, offset);
          offset += chunk.length;
        }

        const go = new Go();
        const result = await WebAssembly.instantiate(wasm, go.importObject);

        document.getElementById("loader").remove();
        await go.run(result.instance);
      } catch (error) {
        status.textContent = `Unable to load game: ${error.message}`;
        progress.hidden = true;
        downloaded.textContent = "";
        console.error(error);
      }
    }

    start();
  </script>
</body>
</html>