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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const WEBGL_CONTEXT_NAME = "experimental-webgl";
function isWebGLForceEnabled() {
return Services.prefs.getBoolPref("webgl.force-enabled");
}
function isWebGLSupportedByGFX() {
let supported = false;
try {
const gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
const angle = gfxInfo.FEATURE_WEBGL_ANGLE;
const opengl = gfxInfo.FEATURE_WEBGL_OPENGL;
// if either the Angle or OpenGL renderers are available, WebGL should work
supported =
gfxInfo.getFeatureStatus(angle) === gfxInfo.FEATURE_STATUS_OK ||
gfxInfo.getFeatureStatus(opengl) === gfxInfo.FEATURE_STATUS_OK;
} catch (e) {
return false;
}
return supported;
}
function create3DContext(canvas) {
// try to get a valid context from an existing canvas
let context = null;
try {
context = canvas.getContext(WEBGL_CONTEXT_NAME);
} catch (e) {
return null;
}
return context;
}
function createCanvas(doc) {
return doc.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
}
function isWebGLSupported(doc) {
const supported =
!isWebGLForceEnabled() &&
isWebGLSupportedByGFX() &&
create3DContext(createCanvas(doc));
return supported;
}
exports.isWebGLSupported = isWebGLSupported;
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