Paper/Spigot-API-Patches/0138-Allow-Blocks-to-be-accessed-via-a-long-key.patch

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From d9d41debeb4d52f921e1751ed7f401aeba037dbd Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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 84b7d93cf..334e31350 100644
--- a/src/main/java/org/bukkit/Location.java
+++ b/src/main/java/org/bukkit/Location.java
@@ -578,6 +578,18 @@ 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()
+ */
+ public long toBlockKey() {
+ return ((long)getBlockX() & 0x7FFFFFF) | (((long)getBlockZ() & 0x7FFFFFF) << 27) | ((long)getBlockY() << 54);
+ }
+ // 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 1b0744ed9..158917492 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -80,6 +80,39 @@ 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 Location#toBlockKey()
+ * @see Block#getBlockKey()
+ */
+ @NotNull
+ public default Block getBlockAtKey(long key) {
+ int x = (int) ((key << 37) >> 37);
+ int y = (int) (key >>> 54);
+ int z = (int) ((key << 10) >> 37);
+ 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 Location#toBlockKey()
+ * @see Block#getBlockKey()
+ */
+ @NotNull
+ public default Location getLocationAtKey(long key) {
+ int x = (int) ((key << 37) >> 37);
+ int y = (int) (key >>> 54);
+ int z = (int) ((key << 10) >> 37);
+ return new Location(this, x, y, z);
+ }
+ // Paper end
+
/**
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* 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 708288e99..42f31db29 100644
--- a/src/main/java/org/bukkit/block/Block.java
+++ b/src/main/java/org/bukkit/block/Block.java
@@ -153,6 +153,33 @@ public interface Block extends Metadatable {
*/
int getZ();
+ // Paper Start
+
+ /**
+ * Returns this block's coordinates packed into a long value
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+ * <p>
+ * The return value can be computed as follows:
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+ * <br>
+ * {@code long value = ((long)getX() & 0x7FFFFFF) | (((long)getZ() & 0x7FFFFFF) << 27) | ((long)getY() << 54);}
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+ * </p>
+ *
+ * <p>
+ * And may be unpacked as follows:
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+ *<br>
+ * {@code int x = (int) ((packed << 37) >> 37);}
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+ * <br>
+ * {@code int y = (int) (packed >>> 54);}
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+ * <br>
+ * {@code int z = (int) ((packed << 10) >> 37);}
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+ * </p>
+ *
+ * @return This block's x, y, and z coordinates packed into a long value
+ */
+ public default long getBlockKey() {
+ return ((long)getX() & 0x7FFFFFF) | (((long)getZ() & 0x7FFFFFF) << 27) | ((long)getY() << 54);
+ }
+ // Paper End
+
/**
* Gets the Location of the block
*
--
2.21.0