dom/canvas/test/webgl-conf/checkout/conformance2/wasm/getbuffersubdata-4gb-wasm-memory.html
author Gabriel Luong <gabriel.luong@gmail.com>
Sun, 13 Jul 2025 02:28:40 +0000 (16 hours ago)
changeset 796385 23185ed855a5b168943bde8ebe8ec946cd83f675
parent 733882 f84653591dd8f1b955c0215059e19d6b82a52016
permissions -rw-r--r--
Bug 1972159 - Part 25: Enable Compose Homepage by default and remove associated settings and Nimbus flags r=android-reviewers,devota Differential Revision: https://phabricator.services.mozilla.com/D254598
<!--
Copyright (c) 2024 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>getBufferSubData test to Wasm Memory 4GB in size.</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"> </script>
</head>
<body>
<canvas id="canvas" width="2" height="2" style="width: 40px; height: 40px;"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description(document.title);
debug("Tests that getBufferSubData can be called on WebAssembly Memory of 4GB in size.");
debug("");
let wtu = WebGLTestUtils;
let gl = wtu.create3DContext("canvas", undefined, 2);

const PAGE = 65536;
const SIZE = 4 * 1024 * 1024 * 1024 - PAGE;
let view = new Uint8Array(new WebAssembly.Memory({ initial: SIZE / PAGE }).buffer);
let expectedData = new Uint8Array([1, 2, 3, 4]);

let buf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buf);
gl.bufferData(gl.ARRAY_BUFFER, expectedData, gl.STATIC_DRAW);

const length = expectedData.length;
const offset = SIZE - length;
gl.getBufferSubData(gl.ARRAY_BUFFER, 0, view, offset, length);
wtu.glErrorShouldBe(gl, gl.NO_ERROR);
for (let i = 0; i < length; i++) {
  shouldBe(`view[${i + offset}]`, `expectedData[${i}]`);
}

var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>