VRDisplayCapabilities - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The VRDisplayCapabilities interface of the WebVR API describes the capabilities of a VRDisplay — its features can be used to perform VR device capability tests, for example can it return position information.

This interface is accessible through the VRDisplay.capabilities property.

Properties

VRDisplayCapabilities.canPresent Read only

Returns a Boolean stating whether the VR display is capable of presenting content (e.g. through an HMD).

VRDisplayCapabilities.hasExternalDisplay Read only

Returns a Boolean stating whether the VR display is separate from the device's primary display.

VRDisplayCapabilities.hasOrientation  Read only

Returns a Boolean stating whether the VR display can track and return orientation information.

VRDisplayCapabilities.hasPosition Read only

Returns a Boolean stating whether the VR display can track and return position information.

VRDisplayCapabilities.maxLayers Read only

Returns a number indicating the maximum number of VRLayers that the VR display can present at once (e.g. the maximum length of the array that VRDisplay.requestPresent() can accept.)

Examples

function reportDisplays() {
  navigator.getVRDisplays().then(function(displays) {
    for(var i = 0; i < displays.length; i++) {
      var cap = displays[i].capabilities;
      // cap is a VRDisplayCapabilities object
      var listItem = document.createElement('li');
      listItem.innerHTML = '<strong>Display ' + (i+1) + '</strong>'
                   + '<br>VR Display ID: ' + displays[i].displayId
                   + '<br>VR Display Name: ' + displays[i].displayName
                   + '<br>Display can present content: ' + cap.canPresent
                   + '<br>Display is separate from the computer\'s main display: ' + cap.hasExternalDisplay
                   + '<br>Display can return position info: ' + cap.hasPosition
                   + '<br>Display can return orientation info: ' + cap.hasOrientation
                   + '<br>Display max layers: ' + cap.maxLayers;
      list.appendChild(listItem);
    }
  });
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WebVR API homepage
• MozVr.com — demos, downloads, and other resources from the Mozilla VR team.