mirror of https://github.com/GeyserMC/Geyser.git
105 lines
3.4 KiB
Java
105 lines
3.4 KiB
Java
/*
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* Copyright (c) 2019-2022 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.geyser.level.chunk.bitarray;
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import org.geysermc.geyser.util.MathUtils;
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public enum BitArrayVersion {
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V16(16, 2, null),
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V8(8, 4, V16),
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V6(6, 5, V8), // 2 bit padding
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V5(5, 6, V6), // 2 bit padding
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V4(4, 8, V5),
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V3(3, 10, V4), // 2 bit padding
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V2(2, 16, V3),
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V1(1, 32, V2),
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V0(0, 0, V1);
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private static final BitArrayVersion[] VALUES = values();
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final byte bits;
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final byte entriesPerWord;
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final int maxEntryValue;
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final BitArrayVersion next;
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BitArrayVersion(int bits, int entriesPerWord, BitArrayVersion next) {
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this.bits = (byte) bits;
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this.entriesPerWord = (byte) entriesPerWord;
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this.maxEntryValue = (1 << this.bits) - 1;
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this.next = next;
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}
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public static BitArrayVersion get(int version, boolean read) {
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for (BitArrayVersion ver : values()) {
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if ((!read && ver.entriesPerWord <= version) || (read && ver.bits == version)) {
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return ver;
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}
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}
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throw new IllegalArgumentException("Invalid palette version: " + version);
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}
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public static BitArrayVersion forBitsCeil(int bits) {
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for (int i = VALUES.length - 1; i >= 0; i--) {
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BitArrayVersion version = VALUES[i];
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if (version.bits >= bits) {
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return version;
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}
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}
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return null;
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}
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public byte getId() {
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return bits;
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}
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public int getMaxEntryValue() {
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return maxEntryValue;
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}
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public int getWordsForSize(int size) {
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return MathUtils.ceil((float) size / entriesPerWord);
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}
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public BitArrayVersion next() {
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return next;
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}
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public BitArray createArray(int size) {
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return this.createArray(size, new int[MathUtils.ceil((float) size / entriesPerWord)]);
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}
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public BitArray createArray(int size, int[] words) {
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if (this == V3 || this == V5 || this == V6) {
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// Padded palettes aren't able to use bitwise operations due to their padding.
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return new PaddedBitArray(this, size, words);
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} else if (this == V0) {
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return SingletonBitArray.INSTANCE;
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} else {
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return new Pow2BitArray(this, size, words);
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}
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}
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}
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