Android Open Source - gdx-vr Head Mounted Display

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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.//from  w w  w.j  a  v a  2 s  . c  o  m
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.vr;

/**
 * Defines the physical parameters of a Cardboard-compatible device.
 * 
 * The model assumes the following for any Cardboard device:
 * 
 * <ul>
 * <li>Lenses are parallel to the screen of the inserted device.</li>
 * <li>The center of each lens is at the same height from the bottom of the
 * inserted device.</li>
 * <li>Lenses are symmetrically placed with respect to the center of the
 * inserted device screen.</li>
 * <li>The size of the area visible from the center of each lens is the same.</li>
 * </ul>
 * 
 * These parameters might be different for variations of different devices or
 * lenses. For simplicity, they can be stored in the NFC tag of the Cardboard.
 * 
 * @author Daniel Holderbaum
 */
public interface HeadMountedDisplay {

  /**
   * TODO: move to DeviceOpticsInformation? Returns the lens distortion model.
   * 
   * @return The lens distortion model.
   */
  Distortion getDistortion();

  DeviceMetaInformation getDeviceMetaInformation();

  DeviceOpticsInformation getDeviceOpticsInformation();

  DeviceScreenInformation getDeviceScreenInformation();

  // /** Returns the NFC tag contents from there these parameters were
  // extracted. */
  // NdefMessage getNfcTagContents();

}

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