From bffe01ee161acd842855809fd8c743d2e8e5566f Mon Sep 17 00:00:00 2001
From: David Manthey <david.manthey@kitware.com>
Date: Thu, 1 Nov 2018 10:12:22 -0400
Subject: [PATCH] Record the unmasked renderer used with webgl.

This can be reached via
`geo.registries.renderers.vgl._unmaskedRenderer`.
---
 src/gl/vglRenderer.js | 9 ++++++++-
 src/util/mockVGL.js   | 4 ++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/gl/vglRenderer.js b/src/gl/vglRenderer.js
index c766957371..c7616d7b42 100644
--- a/src/gl/vglRenderer.js
+++ b/src/gl/vglRenderer.js
@@ -341,7 +341,14 @@ vglRenderer.supported = function () {
       canvas = document.createElement('canvas');
       ctx = (canvas.getContext('webgl') ||
              canvas.getContext('experimental-webgl'));
-      exts = ctx.getSupportedExtensions(); // used for side effects
+      /* getSupportExtensions will throw an exception if the context isn't
+       * really supported. */
+      exts = ctx.getSupportedExtensions();
+      /* If available, store the unmasked renderer to aid in debugging. */
+      if (exts.indexOf('WEBGL_debug_renderer_info') >= 0) {
+        vglRenderer._unmaskedRenderer = ctx.getParameter(ctx.getExtension(
+          'WEBGL_debug_renderer_info').UNMASKED_RENDERER_WEBGL);
+      }
       checkedWebGL = true;
     } catch (e) {
       console.warn('No webGL support');
diff --git a/src/util/mockVGL.js b/src/util/mockVGL.js
index 5d610aa432..3605569a3d 100644
--- a/src/util/mockVGL.js
+++ b/src/util/mockVGL.js
@@ -107,6 +107,10 @@ module.exports.mockVGLRenderer = function mockVGLRenderer(supported) {
         return true;
       }
     },
+    getSupportedExtensions: function () {
+      count('getSupportedExtensions');
+      return [];
+    },
     getUniformLocation: incID('getUniformLocation'),
     isEnabled: function (key) {
       count('isEnabled');