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Minecraft 21w13a代碼解析

2021-04-04 16:23 作者:Nickid2018  | 我要投稿

這周的快照21w13a發(fā)布了，看看都有啥吧！

版本對(duì)照（21w11a->21w13a）：https://paste.ubuntu.com/p/WWZxXbx3Tf/

說(shuō)在前面

這個(gè)版本開(kāi)始，原版代碼的閱讀和直接修改可能會(huì)更加便捷——Mojang對(duì)一些常量進(jìn)行了棄用和增加（導(dǎo)致了至少2700個(gè)類(lèi)被修改，詳見(jiàn)版本對(duì)照表），各個(gè)包下也增加了package-info，還加入了有關(guān)于混淆的注釋。下面是在SharedConstants中具體的表現(xiàn)：

1.棄用的字段

@Deprecated
public static final boolean SNAPSHOT = true; // 是否為快照版本
@Deprecated
public static final int WORLD_VERSION = 2705; // 世界版本
@Deprecated
public static final String VERSION_STRING = "21w13a"; // 版本號(hào)
@Deprecated
public static final String RELEASE_TARGET = "1.17"; // 發(fā)行版本
@Deprecated
public static final int RELEASE_NETWORK_PROTOCOL_VERSION = 755; //發(fā)行網(wǎng)絡(luò)版本協(xié)議號(hào)
@Deprecated
public static final int SNAPSHOT_NETWORK_PROTOCOL_VERSION = 20; // 快照網(wǎng)絡(luò)版本協(xié)議號(hào)
@Deprecated
public static final int RESOURCE_PACK_FORMAT = 7; // 資源包版本
@Deprecated
public static final int DATA_PACK_FORMAT = 7; // 數(shù)據(jù)包版本

2.增加的字段

public static final boolean NEW_WORLD_GENERATION = true;
public static final boolean EXTENDED_WORLD_HEIGHT = true;
public static final boolean USE_NEW_RENDERSYSTEM = false; // 開(kāi)閉新渲染系統(tǒng)？
public static final boolean MULTITHREADED_RENDERING = false; // 多線(xiàn)程渲染？
public static final boolean FIX_TNT_DUPE = false; // TNT 復(fù)制修復(fù)？
public static final boolean ENABLE_SNOOPER = false;
/* 調(diào)試常量 */
public static final boolean USE_DEBUG_FEATURES = false;
public static final boolean DEBUG_HOTKEYS = false;
public static final boolean DEBUG_RENDER = false;
public static final boolean DEBUG_PATHFINDING = false;
public static final boolean DEBUG_WATER = false;
public static final boolean DEBUG_HEIGHTMAP = false;
public static final boolean DEBUG_COLLISION = false;
public static final boolean DEBUG_SHAPES = false;
public static final boolean DEBUG_NEIGHBORSUPDATE = false;
public static final boolean DEBUG_STRUCTURES = false;
public static final boolean DEBUG_LIGHT = false;
public static final boolean DEBUG_WORLDGENATTEMPT = false;
public static final boolean DEBUG_SOLID_FACE = false;
public static final boolean DEBUG_CHUNKS = false;
public static final boolean DEBUG_GAME_EVENT_LISTENERS = false;
public static final boolean DEBUG_DUMP_TEXTURE_ATLAS = false;
public static final boolean DEBUG_DUMP_INTERPOLATED_TEXTURE_FRAMES = false;
public static final boolean DEBUG_STRUCTURE_EDIT_MODE = false;
public static final boolean DEBUG_SAVE_STRUCTURES_AS_SNBT = false;
public static final boolean DEBUG_SYNCHRONOUS_GL_LOGS = false;
public static final boolean DEBUG_VERBOSE_SERVER_EVENTS = false;
public static final boolean DEBUG_NAMED_RUNNABLES = false;
public static final boolean DEBUG_GOAL_SELECTOR = false;
public static final boolean DEBUG_VILLAGE_SECTIONS = false;
public static final boolean DEBUG_BRAIN = false;
public static final boolean DEBUG_BEES = false;
public static final boolean DEBUG_RAIDS = false;
public static final boolean DEBUG_BLOCK_BREAK = false;
public static final boolean DEBUG_RESOURCE_LOAD_TIMES = false;
public static final boolean DEBUG_MONITOR_TICK_TIMES = false;
public static final boolean DEBUG_KEEP_JIGSAW_BLOCKS_DURING_STRUCTURE_GEN = false;
public static final boolean DEBUG_DONT_SAVE_WORLD = false;
public static final boolean DEBUG_LARGE_DRIPSTONE = false;
public static final boolean DEBUG_PACKET_SERIALIZATION = false;
public static final boolean DEBUG_CARVERS = false;
public static final boolean DEBUG_SMALL_SPAWN = false;
public static final boolean DEBUG_DISABLE_LIQUID_SPREADING = false;
public static final boolean DEBUG_ONLY_GENERATE_HALF_THE_WORLD = false;
public static final boolean DEBUG_DISABLE_WATER_GENERATION = false;
public static final boolean DEBUG_DISABLE_AQUIFERS = false;
public static final boolean DEBUG_DISABLE_NOISE_CAVES = false;
public static final boolean DEBUG_DISABLE_SURFACE = false;
public static final boolean DEBUG_DISABLE_CARVERS = false;
public static final boolean DEBUG_DISABLE_STRUCTURES = false;
public static final boolean DEBUG_DISABLE_FEATURES = false;
public static final boolean INGAME_DEBUG_OUTPUT = false;
public static final boolean DEBUG_SUBTITLES = false;
public static final boolean DEBUG_WORLD_RECREATE = false;
public static final boolean DEBUG_SHOW_SERVER_DEBUG_VALUES = false;
public static final boolean DEBUG_STORE_CHUNK_STACKTRACES = false;
public static final int FAKE_MS_LATENCY = 0;
public static final int FAKE_MS_JITTER = 0;
public static final Level NETTY_LEAK_DETECTION;
public static final boolean COMMAND_STACK_TRACES = false;
/* 世界設(shè)置 */
public static final int DEFAULT_MINECRAFT_PORT = 25565;
public static final float RAIN_THRESHOLD = 0.15F;
public static final long MAXIMUM_TICK_TIME_NANOS;
public static final int WORLD_RESOLUTION = 16;
public static final int MAX_CHAT_LENGTH = 256;
public static final int MAX_COMMAND_LENGTH = 32500;
public static final int TICKS_PER_SECOND = 20;
public static final int TICKS_PER_MINUTE = 1200;
public static final int TICKS_PER_GAME_DAY = 24000;
public static final float AVERAGE_GAME_TICKS_PER_RANDOM_TICK_PER_BLOCK = 1365.3334F;
public static final float AVERAGE_RANDOM_TICKS_PER_BLOCK_PER_MINUTE = 0.87890625F;
public static final float AVERAGE_RANDOM_TICKS_PER_BLOCK_PER_GAME_DAY = 17.578125F;

目前尚不清楚這些字段的用處，但是也許對(duì)理解Mojang的代碼有好處。

一.山羊

山羊是這個(gè)版本新增加的一種生物，現(xiàn)在沒(méi)有自然生成。它的主要特性是跳躍、擠奶，現(xiàn)在沖撞AI還沒(méi)有加入，應(yīng)該在下個(gè)版本就能加入。

山羊

先說(shuō)說(shuō)跳躍的特性。山羊的跳躍由兩個(gè)類(lèi)控制：LongJumpMidJump和LongJumpToRandomPos。

// 初始化跳躍AI
private static void initLongJumpActivity(Brain brain) {
	brain.addActivityWithConditions(Activity.LONG_JUMP, ImmutableList.of(Pair.of(0, new LongJumpMidJump(TIMES_BETWEEN_LONG_JUMPS)), Pair.of(1, new LongJumpToRandomPos(TIMES_BETWEEN_LONG_JUMPS, 5, 5, 1.5f))), ImmutableSet.of(Pair.of(MemoryModuleType.TEMPTING_PLAYER, MemoryStatus.VALUE_ABSENT), Pair.of(MemoryModuleType.BREED_TARGET, MemoryStatus.VALUE_ABSENT), Pair.of(MemoryModuleType.WALK_TARGET, MemoryStatus.VALUE_ABSENT), Pair.of(MemoryModuleType.LONG_JUMP_COOLDOWN_TICKS, MemoryStatus.VALUE_ABSENT)));
	}

每次嘗試跳躍間隔是600-1200游戲刻。在跳躍之前，山羊會(huì)檢查腳下方塊，如果是蜂蜜塊，則不會(huì)跳躍。之后，山羊會(huì)在周?chē)?x9x9范圍內(nèi)尋找可以進(jìn)行跳躍的方塊，生成一個(gè)可跳躍方塊列表。在生成跳躍方塊列表后，山羊會(huì)隨機(jī)選取已經(jīng)生成的可到達(dá)位置作為要跳躍到的位置并再次檢查這個(gè)位置是否可被尋路，尋路最大距離為7格。若尋路條件判斷失敗，在下一隨機(jī)刻還會(huì)再次隨機(jī)選取判斷，一共嘗試20次。如果成功，山羊?qū)⒚鎸?duì)將要跳向的方塊，也就是"準(zhǔn)備跳躍"。"準(zhǔn)備跳躍"時(shí)長(zhǎng)40tick，在此時(shí)間內(nèi)山羊不會(huì)再次檢查方塊是否可跳躍，所以在此期間破壞將要跳向的方塊不會(huì)導(dǎo)致此AI取消。40tick結(jié)束后，山羊跳躍，跳躍最大速度為1.5m/tick，摩擦失效，跳躍提升對(duì)此無(wú)作用。落地時(shí)，摩擦重新生效，速度變?yōu)橹暗?.1倍。

// 開(kāi)始AI運(yùn)作
protected void start(ServerLevel serverLevel, Mob mob, long l) {
	this.chosenJump = Optional.empty();
	this.findJumpTries = 20;
	this.jumpCandidates.clear();
	this.initialPosition = Optional.of(mob.position());
	BlockPos blockPos = mob.blockPosition();
	int n = blockPos.getX();
	int n2 = blockPos.getY();
	int n3 = blockPos.getZ();
	Iterable iterable = BlockPos.betweenClosed(n - this.maxLongJumpWidth,
			n2 - this.maxLongJumpHeight, n3 - this.maxLongJumpWidth,
			n + this.maxLongJumpWidth, n2 + this.maxLongJumpHeight,
			n3 + this.maxLongJumpWidth);
	PathNavigation pathNavigation = mob.getNavigation();
	for (BlockPos blockPos2 : iterable) {
		double d = blockPos2.distSqr(blockPos);
		if (n == blockPos2.getX() && n3 == blockPos2.getZ() || !pathNavigation.isStableDestination(blockPos2)
				|| mob.getPathfindingMalus(WalkNodeEvaluator.getBlockPathTypeStatic(mob.level,blockPos2.mutable())) != 0.0f)
			continue;
		Optional optional = this.calculateOptimalJumpVector(mob, Vec3.atCenterOf(blockPos2));
		optional.ifPresent(vec3 -> this.jumpCandidates
				.add(new PossibleJump(new BlockPos(blockPos2), vec3, Mth.ceil(d))));
	}
}
// AI的游戲刻運(yùn)行
protected void tick(ServerLevel serverLevel, Mob mob, long l) {
	if (this.chosenJump.isPresent()) {
		if (l - this.prepareJumpStart >= 40L) {
			mob.yRot = mob.yBodyRot;
			mob.setDiscardFriction(true);
			mob.setDeltaMovement(this.chosenJump.get().getJumpVector());
			mob.getBrain().setMemory(MemoryModuleType.LONG_JUMP_MID_JUMP, (Object) true);
		}
	} else {
		--this.findJumpTries;
		Optional optional = WeighedRandom.getRandomItem(serverLevel.random, this.jumpCandidates);
		if (optional.isPresent()) {
			this.jumpCandidates.remove(optional.get());
			mob.getBrain().setMemory(MemoryModuleType.LOOK_TARGET,
					(Object) new BlockPosTracker(((PossibleJump) optional.get()).getJumpTarget()));
			PathNavigation pathNavigation = mob.getNavigation();
			Path path = pathNavigation.createPath(((PossibleJump) optional.get()).getJumpTarget(), 0, 7);
			if (path == null || !path.canReach()) { 
				this.chosenJump = optional;
				this.prepareJumpStart = l;
			}
		}
	}
}

那么山羊?yàn)槭裁磸倪@么高的位置摔下不會(huì)扣血呢？答案是：覆寫(xiě)了calculateFallDamage。山羊在計(jì)算下落高度時(shí)會(huì)減掉10格，所以即使跳的很高也不會(huì)摔掉血。

// 計(jì)算下落距離
protected int calculateFallDamage(float f, float f2) {
	return super.calculateFallDamage(f, f2) - 10;
}

另一個(gè)特性是擠奶，這個(gè)類(lèi)似于牛。

// 當(dāng)玩家右鍵生物進(jìn)行互動(dòng)時(shí)調(diào)用此方法
public InteractionResult mobInteract(Player player, InteractionHand interactionHand) {
	ItemStack itemStack = player.getItemInHand(interactionHand);
	if (itemStack.is(Items.BUCKET) && !this.isBaby()) {
		player.playSound(this.getMilkingSound(), 1.0f, 1.0f);
		ItemStack itemStack2 = ItemUtils.createFilledResult(itemStack, player, Items.MILK_BUCKET.getDefaultInstance());
		player.setItemInHand(interactionHand, itemStack2);
		return InteractionResult.sidedSuccess(this.level.isClientSide);
	}
	return super.mobInteract(player, interactionHand);
}

二.光源方塊

光源方塊本身是基巖版的專(zhuān)屬，在此版本也加入了Java版，它是一種看不見(jiàn)的方塊，不阻礙天空光，類(lèi)似屏障只能手持同類(lèi)物品才能看到，能散發(fā)出指定強(qiáng)度的方塊光，同時(shí)也是一個(gè)含水方塊。

光源方塊

它的獲取和同樣身為"OP方塊"的命令方塊、結(jié)構(gòu)方塊、拼圖方塊、結(jié)構(gòu)空位一樣需要用give指令。獲取它需要輸入/give @s minecraft:light。如果要獲得指定亮度的光源方塊物品（默認(rèn)為15級(jí)亮度方塊），就要輸入/give @s minecraft:light{"BlockStateTag":{"level":<亮度0-15>}}。同樣，對(duì)一個(gè)已經(jīng)放置的光源方塊中建選取也能獲得物品（必須手持另一個(gè)光源方塊）。

// 中鍵選取方塊時(shí)調(diào)用
public ItemStack getCloneItemStack(BlockGetter blockGetter, BlockPos blockPos, BlockState blockState) {
	ItemStack itemStack = super.getCloneItemStack(blockGetter, blockPos, blockState);
	CompoundTag compoundTag = new CompoundTag();
	compoundTag.putString(LEVEL.getName(), String.valueOf(blockState.getValue(LEVEL)));
	itemStack.addTagElement("BlockStateTag", (Tag) compoundTag);
	return itemStack;
}

在平常狀況下，我們無(wú)法碰到光源方塊，因?yàn)樗匠顟B(tài)下沒(méi)有包圍盒。但是當(dāng)我們手持光源方塊物品時(shí)，它就能被點(diǎn)中，并且還能像屏障一樣顯示。

// 當(dāng)玩家看向這個(gè)方塊時(shí)，視線(xiàn)計(jì)算碰撞使用此方法
public VoxelShape getShape(BlockState blockState, BlockGetter blockGetter, BlockPos blockPos, CollisionContext collisionContext) {
	return collisionContext.isHoldingItem(Items.LIGHT) ? Shapes.block() : Shapes.empty();
}

當(dāng)我們右鍵它時(shí)，它會(huì)更改它的亮度，從0-15之間輪回。

// 當(dāng)玩家以右鍵與方塊交互時(shí)，調(diào)用此方法
public InteractionResult use(BlockState blockState, Level level, BlockPos blockPos, Player player, InteractionHand interactionHand, BlockHitResult blockHitResult) {
	if (!level.isClientSide) {
		level.setBlock(blockPos, blockState.cycle(LEVEL), 2 /* 注:這個(gè)2(0b10)是更新標(biāo)識(shí) */);
		return InteractionResult.SUCCESS;
	}
	return InteractionResult.CONSUME;
}

三.細(xì)雪方塊的修改

細(xì)雪方塊在這個(gè)版本進(jìn)行了一些修改，如下：

1)當(dāng)著火的生物實(shí)體進(jìn)入細(xì)雪內(nèi)，火會(huì)熄滅并且這個(gè)細(xì)雪方塊消失

骷髏著火走入細(xì)雪中，細(xì)雪消失

2)下落速度變?yōu)?.5（之前是0.99）

// 當(dāng)實(shí)體進(jìn)入方塊內(nèi)部，調(diào)用此方法
public void entityInside(BlockState blockState, Level level, BlockPos blockPos, Entity entity) {
	if (!(entity instanceof LivingEntity) || ((LivingEntity) entity).getFeetBlockState().is(Blocks.POWDER_SNOW)) {
		entity.makeStuckInBlock(blockState, new Vec3(0.9, 1.5, 0.9));
	}
	entity.setIsInPowderSnow(true);
	if (entity.isOnFire()) {
		level.setBlockAndUpdate(blockPos, Blocks.AIR.defaultBlockState());
		level.addDestroyBlockEffect(blockPos, blockState);
	}
	if (level.isClientSide) {
		entity.clearFire();
	} else {
		entity.setSharedFlagOnFire(false);
	}
	if (!entity.isSpectator() && (entity.xOld != entity.getX() || entity.zOld != entity.getZ()) && level.random.nextBoolean()) {
		PowderSnowBlock.spawnPowderSnowParticles(level,
				new Vec3(entity.getX(), blockPos.getY(), entity.getZ()));
	}
}

3)實(shí)體凍傷開(kāi)始時(shí)間變?yōu)?40tick。完全冰凍后，每40tick受到1點(diǎn)傷害；對(duì)于烈焰人、巖漿怪、熾足獸這種帶有FREEZE_HURTS_EXTRA_TYPES的生物為5點(diǎn)傷害。

// aiStep中的一段代碼
boolean bl = this.getType().is(EntityTypeTags.FREEZE_HURTS_EXTRA_TYPES);
if (!this.level.isClientSide) {
	n = this.getTicksFrozen();
	if (this.isInPowderSnow && this.canFreeze()) {
		this.setTicksFrozen(Math.min(this.getTicksRequiredToFreeze(), n + 1));
	} else {
		this.setTicksFrozen(Math.max(0, n - 2));
	}
}
removeFrost();
tryAddFrost();
if (!level.isClientSide && tickCount % 40 == 0 && this.isFullyFrozen() && this.canFreeze()) {
	n = bl ? 5 : 1;
	this.hurt(DamageSource.FREEZE, n);
}

4)骷髏轉(zhuǎn)變?yōu)榱骼苏邚倪M(jìn)入細(xì)雪的140tick開(kāi)始，再經(jīng)過(guò)300tick轉(zhuǎn)變?yōu)榱骼苏摺?/p>

骷髏轉(zhuǎn)化為流浪者
// Skeleton類(lèi)中的一部分代碼，執(zhí)行游戲刻
public void tick() {
	if (!this.level.isClientSide && this.isAlive() && !this.isNoAi()) {
		if (this.isFreezeConverting()) {
			--this.conversionTime;
			if (this.conversionTime < 0) {
				this.doFreezeConversion();
			}
		} else if (this.isInPowderSnow) {
			++this.inPowderSnowTime;
			if (this.inPowderSnowTime >= 140) {
				this.startFreezeConversion(300);
			}
		} else {
			this.inPowderSnowTime = -1;
		}
	}
	super.tick();
}

四.美西螈的修改

美西螈的一些bug在這個(gè)版本中被修復(fù)（即使MC-208626還在堅(jiān)持著）

1)美西螈桶現(xiàn)在能保存美西螈的信息，特有的NBT標(biāo)簽為variant（變種）和age（年齡）。可是，Bugjump忘加了美西螈CustomName的保存，所以將美西螈裝到桶里再放出來(lái)命名丟失。（各種魚(yú)桶同理）

// 用桶接
public InteractionResult mobInteract(Player player, InteractionHand interactionHand) {
	return Bucketable.bucketMobPickup(player, interactionHand, this)
			.orElse(super.mobInteract(player, interactionHand));
}
// 保存到桶中的額外數(shù)據(jù)
public void saveToBucketTag(ItemStack itemStack) {
	Bucketable.saveDefaultDataToBucketTag(this, itemStack);
	CompoundTag compoundTag = itemStack.getOrCreateTag();
	compoundTag.putInt(VARIANT_TAG, this.getVariant().getId());
	compoundTag.putInt("Age", this.getAge());
}
// 恢復(fù)額外數(shù)據(jù)
public void loadFromBucketTag(CompoundTag compoundTag) {
	Bucketable.loadDefaultDataFromBucketTag(this, compoundTag);
	this.setVariant(Variant.BY_ID[compoundTag.getInt(VARIANT_TAG)]);
	if (compoundTag.contains("Age")) {
		this.setAge(compoundTag.getInt("Age"));
	}
}

2)修復(fù)了無(wú)法清除挖掘疲勞和給予生命恢復(fù)的bug

// AxolotlAi調(diào)用了此方法
public static void applySupportingEffects(Player player) {
	MobEffectInstance mobEffectInstance = player.getEffect(MobEffects.REGENERATION);
	int n = 100 + (mobEffectInstance != null ? mobEffectInstance.getDuration() : 0);
	player.addEffect(new MobEffectInstance(MobEffects.REGENERATION, n, 0));
	player.removeEffect(MobEffects.DIG_SLOWDOWN);
}

3)擊殺非敵對(duì)生物獲得2400tick冷卻時(shí)間

代碼源：21w13a，以Mojang Name反混淆

反混淆器：MCDynamicExchanger beta.6

[項(xiàng)目地址 https://github.com/Nickid2018/MCDynamicExchanger]

反編譯器：CFK，F(xiàn)ernFlower

標(biāo)簽：

Minecraft 21w13a代碼解析的評(píng)論 (共 條)

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