This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The source property of the VRLayerInit interface (dictionary) defines the canvas whose contents will be presented by the VRDisplay.
Syntax
var myVRLayerInit = { };
myVRLayerInit.source = myCanvas;
Value
An HTMLCanvasElement or OffscreenCanvas object.
Examples
// currently returns an empty array
var layers = vrDisplay.getLayers();
if(navigator.getVRDisplays) {
console.log('WebVR 1.1 supported');
// Then get the displays attached to the computer
navigator.getVRDisplays().then(function(displays) {
// If a display is available, use it to present the scene
if(displays.length > 0) {
vrDisplay = displays[0];
console.log('Display found');
// Starting the presentation when the button is clicked: It can only be called in response to a user gesture
btn.addEventListener('click', function() {
vrDisplay.requestPresent([{ source: canvas }]).then(function() {
console.log('Presenting to WebVR display');
// Here it returns an array of VRLayerInit objects
var layers = vrDisplay.getLayers();
...
});
});
}
});
}
VRLayerInit objects look something like this:
{
leftBounds : [ ... ],
rightBounds: [ ... ],
source: canvasReference
}
Note: The canvasReference refers to the <canvas> element itself, not the WebGL context associated with the canvas. The other two members are arrays
Specifications
| Specification | Status | Comment |
|---|---|---|
| WebVR 1.1 The definition of 'source' in that specification. |
Editor's Draft | Initial definition |
Browser compatibility
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | No | (Yes)4 | ? | ? | No | ? | ? |
1. Only works on desktop in an experimental version of Chrome (other builds won't return any devices when Navigator.getVRDisplays() is invoked).
2. , this feature is behind the WebVR preference. To change preferences in Chrome, visit chrome://flags.
3. Currently only Windows support is enabled by default. Mac support is available in Firefox Nightly.
4. Currently supported only by Google Daydream.
See also
- WebVR API homepage
- MozVr.com — demos, downloads, and other resources from the Mozilla VR team.