File: imageBitmapRendering-transferFromImageBitmap-webgl.html

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<!DOCTYPE html>
<link rel="match" href="imageBitmapRendering-transferFromImageBitmap-webgl-expected.html" />

<body>
  <p>
    Test creating an ImageBitmap from the transferToImageBitmap of a webgl OffscreenCanvas, and then
    transferred to an ImageBitmapRenderingContext.
  </p>
  <canvas id="canvas" width="300" height="300"></canvas>
</body>
<script>

  function drawSquares(ctx) {
    ctx.enable(ctx.SCISSOR_TEST);
    ctx.scissor(0, 150, 150, 150);
    ctx.clearColor(1, 0, 0, 1);
    ctx.clear(ctx.COLOR_BUFFER_BIT);
    ctx.scissor(150, 150, 300, 150);
    ctx.clearColor(0, 1, 0, 1);
    ctx.clear(ctx.COLOR_BUFFER_BIT);
    ctx.scissor(0, 0, 150, 150);
    ctx.clearColor(0, 0, 1, 1);
    ctx.clear(ctx.COLOR_BUFFER_BIT);
  }

  async function runTest() {
    const offscreen = new OffscreenCanvas(300, 300);
    const ctxOffscreen = offscreen.getContext('webgl');
    drawSquares(ctxOffscreen);
    const image = offscreen.transferToImageBitmap();
    const canvas = document.getElementById('canvas');
    const ctx = canvas.getContext('bitmaprenderer');
    ctx.transferFromImageBitmap(image);
  }

  runTest();

</script>