test_buffer_mapping_overlapping_views.html

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<html>

  <head>

    <meta charset="utf-8" />

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

    <link rel="stylesheet" href="/tests/SimpleTest/test.css" />

  </head>

  <body>

    <script>

ok(

        SpecialPowers.getBoolPref("dom.webgpu.enabled"),

        "Pref should be enabled."

);

      async function testBody() {

        const adapter = await navigator.gpu.requestAdapter();

        const device = await adapter.requestDevice();

        let buffer = device.createBuffer({

          size: 48,

          usage: GPUBufferUsage.MAP_READ,

          mappedAtCreation: true,

});

        let view1 = buffer.getMappedRange(16, 24);

        function bad_overlap(start, size, complaint) {

          SimpleTest.doesThrow(() => {

            buffer.getMappedRange(start, size);

          }, complaint);

        bad_overlap(8, 16, "overlap start of prior");

        bad_overlap(32, 16, "overlap end of prior");

        bad_overlap(8, 40, "enclose prior");

        bad_overlap(24, 8, "enclosed by prior");

        // Not really an overlap, but this checks for a mistake in

        // an early revision of the patch that introduces this test.

        SimpleTest.doesThrow(() => {

          buffer.getMappedRange(64, 8);

        }, "offset beyond mapped range");

        // should be fine

ok(

          typeof buffer.getMappedRange(0, 16) == "object",

          "no overlap before"

);

        ok(typeof buffer.getMappedRange(40, 8) == "object", "no overlap after");

      SimpleTest.waitForExplicitFinish();

      testBody()

        .catch(e => ok(false, "Unhandled exception " + e))

        .finally(() => SimpleTest.finish());

    </script>

  </body>

</html>