Make vrdisplayactivate driven enter-vr path more robust

Author: dmarcos

package.json

@@ -50,7 +50,7 @@
     "promise-polyfill": "^3.1.0",
     "style-attr": "^1.0.2",
     "super-animejs": "^3.0.0",
-    "super-three": "^0.102.1",
+    "super-three": "^0.102.2",
     "three-bmfont-text": "^2.1.0",
     "webvr-polyfill": "^0.10.10"
   },

src/core/scene/a-scene.js

@@ -38,6 +38,7 @@ module.exports.AScene = registerElement('a-scene', {
   prototype: Object.create(AEntity.prototype, {
     createdCallback: {
       value: function () {
+        this.clock = new THREE.Clock();
         this.isIOS = isIOS;
         this.isMobile = isMobile;
         this.hasWebXR = isWebXRAvailable;
@@ -265,8 +266,8 @@ module.exports.AScene = registerElement('a-scene', {
         // Has VR.
         if (this.checkHeadsetConnected() || this.isMobile) {
           vrDisplay = utils.device.getVRDisplay();
-          vrManager.setDevice(vrDisplay);
           vrManager.enabled = true;
+          vrManager.setDevice(vrDisplay);
 
           if (this.hasWebXR) {
             // XR API.
@@ -286,17 +287,12 @@ module.exports.AScene = registerElement('a-scene', {
               enterVRSuccess();
             });
           } else {
-            // WebVR API.
-            if (vrDisplay.isPresenting) {
-              enterVRSuccess();
-              return Promise.resolve();
-            }
-
             var rendererSystem = this.getAttribute('renderer');
             var presentationAttributes = {
               highRefreshRate: rendererSystem.highRefreshRate,
               foveationLevel: rendererSystem.foveationLevel
             };
+
             return vrDisplay.requestPresent([{
               source: this.canvas,
               attributes: presentationAttributes
@@ -326,6 +322,8 @@ module.exports.AScene = registerElement('a-scene', {
           if (!self.isMobile && !self.checkHeadsetConnected()) {
             requestFullscreen(self.canvas);
           }
+
+          self.renderer.setAnimationLoop(self.render);
           self.resize();
         }
 
@@ -624,19 +622,23 @@ module.exports.AScene = registerElement('a-scene', {
         }
 
         this.addEventListener('loaded', function () {
+          var renderer = this.renderer;
+          var vrManager = this.renderer.vr;
           AEntity.prototype.play.call(this);  // .play() *before* render.
 
           if (sceneEl.renderStarted) { return; }
-
           sceneEl.resize();
 
           // Kick off render loop.
           if (sceneEl.renderer) {
             if (window.performance) { window.performance.mark('render-started'); }
-            sceneEl.clock = new THREE.Clock();
             loadingScreen.remove();
-            sceneEl.renderer.setAnimationLoop(this.render);
-            sceneEl.render();
+            if (utils.device.getVRDisplay().isPresenting) {
+              vrManager.setDevice(utils.device.getVRDisplay());
+              vrManager.enabled = true;
+              sceneEl.enterVR();
+            }
+            renderer.setAnimationLoop(this.render);
             sceneEl.renderStarted = true;
             sceneEl.emit('renderstart');
           }

src/core/scene/loadingScreen.js

@@ -9,22 +9,6 @@ var getSceneCanvasSize;
 var ATTR_NAME = 'loading-screen';
 var LOADER_TITLE_CLASS = 'a-loader-title';
 
-// It catches vrdisplayactivate early to ensure we can enter VR mode after the scene loads.
-window.addEventListener('vrdisplayactivate', function () {
-  var vrManager = sceneEl.renderer.vr;
-  var vrDisplay;
-
-  // WebXR takes priority if available.
-  if (navigator.xr) { return; }
-
-  vrDisplay = utils.device.getVRDisplay();
-  vrManager.setDevice(vrDisplay);
-  vrManager.enabled = true;
-  if (!vrDisplay.isPresenting) {
-    return vrDisplay.requestPresent([{source: sceneEl.canvas}]).then(function () {}, function () {});
-  }
-});
-
 module.exports.setup = function setup (el, getCanvasSize) {
   sceneEl = el;
   getSceneCanvasSize = getCanvasSize;

src/utils/device.js

@@ -2,6 +2,17 @@ var error = require('debug')('device:error');
 
 var vrDisplay;
 
+// It catches vrdisplayactivate early to ensure we can enter VR mode after the scene loads.
+window.addEventListener('vrdisplayactivate', function (evt) {
+  var canvasEl;
+  // WebXR takes priority if available.
+  if (navigator.xr) { return; }
+  canvasEl = document.createElement('canvas');
+  vrDisplay = evt.display;
+  // Request present immediately. a-scene will be allowed to enter VR without user gesture.
+  vrDisplay.requestPresent([{source: canvasEl}]).then(function () {}, function () {});
+});
+
 // Support both WebVR and WebXR APIs.
 if (navigator.xr) {
   navigator.xr.requestDevice().then(function (device) {

tests/core/scene/a-scene.test.js

@@ -141,7 +141,9 @@ suite('a-scene (without renderer)', function () {
           getDevice: function () {},
           setDevice: function () {},
           setPoseTarget: function () {}
-        }
+        },
+        getContext: function () { return undefined; },
+        setAnimationLoop: function () {}
       };
 
       // mock camera