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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package org.chromium.chromoting.cardboard; | |
| 6 | |
| 7 import java.nio.ByteBuffer; | |
| 8 import java.nio.ByteOrder; | |
| 9 import java.nio.FloatBuffer; | |
| 10 import java.nio.ShortBuffer; | |
| 11 | |
| 12 /** | |
| 13 * Utility class for Cardboard activity. | |
| 14 */ | |
| 15 public class CardboardUtil { | |
| 16 private static final int BYTES_PER_FLOAT = 4; | |
| 17 private static final int BYTES_PER_SHORT = 2; | |
| 18 | |
| 19 /** | |
| 20 * Create rectangular texture float buffer. | |
| 21 */ | |
| 22 public static FloatBuffer makeRectangularTextureBuffer(float left, float rig
ht, | |
| 23 float bottom, float top) { | |
| 24 float[] position = new float[] { | |
| 25 left, bottom, | |
| 26 left, top, | |
| 27 right, bottom, | |
| 28 left, top, | |
| 29 right, top, | |
| 30 right, bottom | |
| 31 }; | |
| 32 return makeFloatBuffer(position); | |
| 33 } | |
| 34 | |
| 35 /** | |
| 36 * Convert float array to a FloatBuffer for use in OpenGL calls. | |
| 37 */ | |
| 38 public static FloatBuffer makeFloatBuffer(float[] data) { | |
| 39 FloatBuffer result = ByteBuffer | |
| 40 .allocateDirect(data.length * BYTES_PER_FLOAT) | |
| 41 .order(ByteOrder.nativeOrder()).asFloatBuffer(); | |
| 42 result.put(data).position(0); | |
| 43 return result; | |
| 44 } | |
| 45 | |
| 46 /** | |
| 47 * Convert short array to a ShortBuffer for use in OpenGL calls. | |
| 48 */ | |
| 49 public static ShortBuffer makeShortBuffer(short[] data) { | |
| 50 ShortBuffer result = ByteBuffer | |
| 51 .allocateDirect(data.length * BYTES_PER_SHORT) | |
| 52 .order(ByteOrder.nativeOrder()).asShortBuffer(); | |
| 53 result.put(data).position(0); | |
| 54 return result; | |
| 55 } | |
| 56 } | |
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