test_backends.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset='UTF-8'>

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

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

</head>

<body>

<script>

function RunWithPrefs(prefPairList, func) {

  var prefEnv = {'set': prefPairList};

  try {

    SpecialPowers.pushPrefEnv(prefEnv, func);

  } catch (e) {

    console.log('Warning: Failed to set prefs: ' + JSON.stringify(prefPairList));

    func();

////////////////////////////////////////

var ANGLE_IS_SINGLETON = true;

var expectD3DType;

try {

  // code borrowed from browser/modules/test/browser_taskbar_preview.js

  var version = SpecialPowers.Services.sysinfo.getProperty('version');

  version = parseFloat(version);

  // Version 6.0 is Vista, 6.1 is 7.

  if (version <= 6.0)

    expectD3DType = 'd3d9';

  else

    expectD3DType = 'd3d11';

} catch (e) {

  expectD3DType = 'd3d11';

function GetRenderer() {

  var c = document.createElement('canvas');

  var gl = c.getContext('experimental-webgl');

  if (!gl)

    return undefined;

  var ext = gl.getExtension('WEBGL_debug_renderer_info');

  if (!ext)

    throw new Error('Requires WEBGL_debug_renderer_info.');

  var renderer = gl.getParameter(ext.UNMASKED_RENDERER_WEBGL);

  return renderer;

function GetRendererType() {

  var renderer = GetRenderer();

  if (renderer === undefined)

    return 'none';

  if (renderer.includes('ANGLE')) {

    if (renderer.includes('Microsoft Basic Render Driver')) // Also includes 'Direct3D11'.

      return 'warp';

    if (renderer.includes('Direct3D11'))

      return 'd3d11';

    if (renderer.includes('Direct3D9'))

      return 'd3d9';

  } else {

    return 'gl';

  throw new Error('Unrecognized renderer type for: ' + renderer);

function TestActualType(testName, expectedType) {

  var actualType = GetRendererType();

  ok(actualType == expectedType,

     '[' + testName + '] Expected ' + expectedType + ', was ' + actualType);

////////////////////////////////////////

function TestDefault() {

  var expectedType = 'gl';

  var isWindows = (navigator.platform.indexOf('Win') == 0);

  if (isWindows) {

    expectedType = expectD3DType;

  TestActualType('TestDefault', expectedType);

  if (isWindows && !ANGLE_IS_SINGLETON) {

    var prefPairList = [

      ['webgl.angle.force-warp', true],

];

    RunWithPrefs(prefPairList, TestWARP);

    return;

  var prefPairList = [

    ['webgl.disabled', true],

];

  RunWithPrefs(prefPairList, TestDisabled);

function TestWARP() {

  var expectedType = (expectD3DType == 'd3d11') ? 'warp' : 'none';

  TestActualType('TestWARP', expectedType);

  var prefPairList = [

    ['webgl.angle.force-warp', false],

    ['webgl.angle.force-d3d11', true],

];

  RunWithPrefs(prefPairList, TestD3D11);

function TestD3D11() {

  var expectedType = (expectD3DType == 'd3d11') ? 'd3d11' : 'none';

  TestActualType('TestD3D11', expectedType);

  var prefPairList = [

    ['webgl.angle.force-d3d11', false],

    ['webgl.angle.try-d3d11', false],

];

  RunWithPrefs(prefPairList, TestD3D9);

function TestD3D9() {

  TestActualType('TestD3D9', 'd3d9');

  var prefPairList = [

    ['webgl.angle.try-d3d11', true],

    ['webgl.disable-angle', true],

];

  RunWithPrefs(prefPairList, TestWinGL);

function TestWinGL() {

  TestActualType('TestWinGL', 'gl');

  var prefPairList = [

    ['webgl.disabled', true],

];

  RunWithPrefs(prefPairList, TestDisabled);

function TestDisabled() {

  TestActualType('TestDisabled', 'none');

  SimpleTest.finish();

////////////////////////////////////////

SimpleTest.waitForExplicitFinish();

var prefPairList = [

  ['webgl.force-enabled', true],

  ['webgl.enable-debug-renderer-info', true],

];

RunWithPrefs(prefPairList, TestDefault);

</script>

</body>

</html>