blob: f7618c3979e2631bf4111770b1cd71e39d6f186d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/* 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 { Cc, Ci } = require("chrome");
const Services = require("Services");
const WEBGL_CONTEXT_NAME = "experimental-webgl";
function isWebGLForceEnabled() {
return Services.prefs.getBoolPref("webgl.force-enabled");
}
function isWebGLSupportedByGFX() {
let supported = false;
try {
let gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
let angle = gfxInfo.FEATURE_WEBGL_ANGLE;
let 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, aFlags);
} catch (e) {
return null;
}
return context;
}
function createCanvas(doc) {
return doc.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
}
function isWebGLSupported(doc) {
let supported =
!isWebGLForceEnabled() &&
isWebGLSupportedByGFX() &&
create3DContext(createCanvas(doc));
return supported;
}
exports.isWebGLSupported = isWebGLSupported;
|
