From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 devtools/client/shared/webgl-utils.js | 55 +++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 devtools/client/shared/webgl-utils.js

(limited to 'devtools/client/shared/webgl-utils.js')

diff --git a/devtools/client/shared/webgl-utils.js b/devtools/client/shared/webgl-utils.js
new file mode 100644
index 000000000..f7618c397
--- /dev/null
+++ b/devtools/client/shared/webgl-utils.js
@@ -0,0 +1,55 @@
+/* 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;
-- 
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