getbuffersubdata-4gb-wasm-memory.html

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<title>getBufferSubData test to Wasm Memory 4GB in size.</title>

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"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;

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