From 777336e47986d99c007847d7ae72f3db8279da5b Mon Sep 17 00:00:00 2001 From: Spottedleaf Date: Tue, 14 Aug 2018 21:42:10 -0700 Subject: [PATCH] Allow Blocks to be accessed via a long key The key can be retrieved via methods Location#toBlockKey() and Block#getBlockKey() World provides lookup for blocks by long key via method World#getBlockAtKey(long) The formatting for the key is as follows: 10 bit y|27 bit z|27 bit x The y value is considered unsigned while z and x are considered two's complement Y range: [0, 1023] X, Z range: [-67 108 864, 67 108 863] diff --git a/src/main/java/org/bukkit/Location.java b/src/main/java/org/bukkit/Location.java index 4c2a269d..2719eecb 100644 --- a/src/main/java/org/bukkit/Location.java +++ b/src/main/java/org/bukkit/Location.java @@ -13,7 +13,6 @@ import org.jetbrains.annotations.Nullable; // Paper start import java.util.Collection; -import java.util.Collections; import java.util.function.Predicate; import org.bukkit.entity.Entity; import org.bukkit.entity.LivingEntity; @@ -578,6 +577,17 @@ public class Location implements Cloneable, ConfigurationSerializable { blockLoc.setZ(getBlockZ()); return blockLoc; } + + // Paper Start + /** + * @return The block key for this location's block location. + * @see Block#getBlockKey(int, int, int) + */ + public long toBlockKey() { + return Block.getBlockKey(getBlockX(), getBlockY(), getBlockZ()); + } + // Paper End + /** * @return A new location where X/Y/Z are the center of the block */ diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java index 1b0744ed..fa736b07 100644 --- a/src/main/java/org/bukkit/World.java +++ b/src/main/java/org/bukkit/World.java @@ -80,6 +80,38 @@ public interface World extends PluginMessageRecipient, Metadatable { @NotNull public Block getBlockAt(@NotNull Location location); + // Paper start + /** + * Gets the {@link Block} at the given block key + * + * @param key The block key. See {@link Block#getBlockKey()} + * @return Block at the key + * @see Block#getBlockKey(int, int, int) + */ + @NotNull + public default Block getBlockAtKey(long key) { + int x = Block.getBlockKeyX(key); + int y = Block.getBlockKeyY(key); + int z = Block.getBlockKeyZ(key); + return getBlockAt(x, y, z); + } + + /** + * Gets the {@link Location} at the given block key + * + * @param key The block key. See {@link Location#toBlockKey()} + * @return Location at the key + * @see Block#getBlockKey(int, int, int) + */ + @NotNull + public default Location getLocationAtKey(long key) { + int x = Block.getBlockKeyX(key); + int y = Block.getBlockKeyY(key); + int z = Block.getBlockKeyZ(key); + return new Location(this, x, y, z); + } + // Paper end + /** * Gets the y coordinate of the lowest block at this position such that the * block and all blocks above it are transparent for lighting purposes. diff --git a/src/main/java/org/bukkit/block/Block.java b/src/main/java/org/bukkit/block/Block.java index 708288e9..c20f903a 100644 --- a/src/main/java/org/bukkit/block/Block.java +++ b/src/main/java/org/bukkit/block/Block.java @@ -153,6 +153,76 @@ public interface Block extends Metadatable { */ int getZ(); + // Paper Start + /** + * Returns this block's coordinates packed into a long value. + * Computed via: {@code Block.getBlockKey(this.getX(), this.getY(), this.getZ())} + * @see Block#getBlockKey(int, int, int) + * @return This block's x, y, and z coordinates packed into a long value + */ + public default long getBlockKey() { + return Block.getBlockKey(this.getX(), this.getY(), this.getZ()); + } + + /** + * Returns the specified block coordinates packed into a long value + *

+ * The return value can be computed as follows: + *
+ * {@code long value = ((long)x & 0x7FFFFFF) | (((long)z & 0x7FFFFFF) << 27) | ((long)y << 54);} + *
+ *

+ * + *

+ * And may be unpacked as follows: + *
+ * {@code int x = (int) ((packed << 37) >> 37);} + *
+ *
+ * {@code int y = (int) (packed >>> 54);} + *
+ *
+ * {@code int z = (int) ((packed << 10) >> 37);} + *
+ *

+ * + * @return This block's x, y, and z coordinates packed into a long value + */ + public static long getBlockKey(int x, int y, int z) { + return ((long)x & 0x7FFFFFF) | (((long)z & 0x7FFFFFF) << 27) | ((long)y << 54); + } + + /** + * Returns the x component from the packed value. + * @param packed The packed value, as computed by {@link Block#getBlockKey(int, int, int)} + * @see Block#getBlockKey(int, int, int) + * @return The x component from the packed value. + */ + public static int getBlockKeyX(long packed) { + return (int) ((packed << 37) >> 37); + } + + /** + * Returns the y component from the packed value. + * @param packed The packed value, as computed by {@link Block#getBlockKey(int, int, int)} + * @see Block#getBlockKey(int, int, int) + * @return The y component from the packed value. + */ + public static int getBlockKeyY(long packed) { + return (int) (packed >>> 54); + } + + /** + * Returns the z component from the packed value. + * @param packed The packed value, as computed by {@link Block#getBlockKey(int, int, int)} + * @see Block#getBlockKey(int, int, int) + * @return The z component from the packed value. + */ + public static int getBlockKeyZ(long packed) { + return (int) ((packed << 10) >> 37); + } + // Paper End + /** * Gets the Location of the block * -- 2.21.0