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Paper/patches/api/0319-Add-Feature-Stage-API.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: dfsek <dfsek@protonmail.com>
Date: Sat, 19 Jun 2021 20:15:29 -0700
Subject: [PATCH] Add Feature Stage API
diff --git a/src/main/java/io/papermc/paper/world/generation/ProtoWorld.java b/src/main/java/io/papermc/paper/world/generation/ProtoWorld.java
new file mode 100644
index 0000000000000000000000000000000000000000..f3b465d3883547d53e55183c2a4e22c63525a787
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/generation/ProtoWorld.java
@@ -0,0 +1,313 @@
+package io.papermc.paper.world.generation;
+
+import org.bukkit.World;
+import org.bukkit.block.BlockState;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Consumer;
+
+
+/**
+ * Represents a small grid of chunks in a {@link World}
+ * with rudimentary block and entity access, for use during world generation.
+ * <p>
+ * A ProtoWorld is guaranteed read/write access to a 3x3 grid of chunks,
+ * but may have access to a grid as large as 17x17. It is safest to assume
+ * that there is only read/write access to 3x3 chunks. Some chunks outside
+ * of the 3x3 area may be readable but not writable.
+ * <p>
+ * ProtoWorlds should not be stored! After they are used during
+ * chunk generation they should be disposed of.
+ */
+public interface ProtoWorld {
+ /**
+ * Sets the block at (x, y, z) to the provided {@link BlockData}.
+ *
+ * @param x X coordinate in this ProtoWorld
+ * @param y Y coordinate in this ProtoWorld
+ * @param z Z coordinate in this ProtoWorld
+ * @param data {@link BlockData} to set the block at the provided coordinates to.
+ */
+ void setBlockData(int x, int y, int z, @NotNull BlockData data);
+
+ /**
+ * Sets the block at a vector location to the provided {@link BlockData}.
+ *
+ * @param vector {@link Vector} representing the position of the block to set.
+ * @param data {@link BlockData} to set the block at the provided coordinates to.
+ */
+ default void setBlockData(@NotNull Vector vector, @NotNull BlockData data) {
+ setBlockData(vector.getBlockX(), vector.getBlockY(), vector.getBlockZ(), data);
+ }
+
+ /**
+ * Sets the {@link BlockState} at a location.
+ *
+ * @param x X coordinate.
+ * @param y Y coordinate.
+ * @param z Z coordinate.
+ * @param state The block state.
+ */
+ void setBlockState(int x, int y, int z, @NotNull BlockState state);
+
+ /**
+ * Sets the {@link BlockState} at a location.
+ *
+ * @param location Location to set block state.
+ * @param state The block state.
+ */
+ default void setBlockState(@NotNull Vector location, @NotNull BlockState state) {
+ setBlockState(location.getBlockX(), location.getBlockY(), location.getBlockZ(), state);
+ }
+
+ /**
+ * Gets the {@link BlockState} at a location.
+ *
+ * @param x X coordinate.
+ * @param y Y coordinate.
+ * @param z Z coordinate.
+ * @return The block state.
+ */
+ @NotNull
+ BlockState getBlockState(int x, int y, int z);
+
+ /**
+ * Gets the {@link BlockState} at a location.
+ *
+ * @param location Location to get block state from.
+ * @return The block state.
+ */
+ @NotNull
+ default BlockState getBlockState(@NotNull Vector location) {
+ return getBlockState(location.getBlockX(), location.getBlockY(), location.getBlockZ());
+ }
+
+ /**
+ * Schedule a block update at (x, y, z).
+ *
+ * @param x X coordinate in this ProtoWorld
+ * @param y Y coordinate in this ProtoWorld
+ * @param z Z coordinate in this ProtoWorld
+ */
+ void scheduleBlockUpdate(int x, int y, int z);
+
+ /**
+ * Schedule a block update at a vector location
+ *
+ * @param location {@link Vector} representing the position of the block to update.
+ */
+ default void scheduleBlockUpdate(@NotNull Vector location) {
+ scheduleBlockUpdate(location.getBlockX(), location.getBlockY(), location.getBlockZ());
+ }
+
+ /**
+ * Schedule a fluid update at (x, y, z).
+ *
+ * @param x X coordinate in this ProtoWorld
+ * @param y Y coordinate in this ProtoWorld
+ * @param z Z coordinate in this ProtoWorld
+ */
+ void scheduleFluidUpdate(int x, int y, int z);
+
+ /**
+ * Schedule a fluid update at a vector location
+ *
+ * @param location {@link Vector} representing the position of the block to update.
+ */
+ default void scheduleFluidUpdate(@NotNull Vector location) {
+ scheduleFluidUpdate(location.getBlockX(), location.getBlockY(), location.getBlockZ());
+ }
+
+ /**
+ * Get the {@link World} object this ProtoWorld represents.
+ * <p>
+ * Do <b>not</b> attempt to read from/write to this world! Doing so during generation <b>will cause a deadlock!</b>
+ *
+ * @return The {@link World} object that this ProtoWorld represents.
+ */
+ @NotNull
+ World getWorld();
+
+
+ /**
+ * Get the {@link BlockData} of the block at the provided coordinates.
+ *
+ * @param x X coordinate in this ProtoWorld
+ * @param y Y coordinate in this ProtoWorld
+ * @param z Z coordinate in this ProtoWorld
+ * @return {@link BlockData} at the coordinates
+ */
+ @NotNull
+ BlockData getBlockData(int x, int y, int z);
+
+ /**
+ * Get the {@link BlockData} of the block at the provided coordinates.
+ *
+ * @param vector {@link Vector} representing the position of the block to get.
+ * @return {@link BlockData} at the coordinates
+ */
+ @NotNull
+ default BlockData getBlockData(@NotNull Vector vector) {
+ return getBlockData(vector.getBlockX(), vector.getBlockY(), vector.getBlockZ());
+ }
+
+ /**
+ * Get the X-coordinate of the chunk in the center of this ProtoWorld
+ *
+ * @return The center chunk's X coordinate.
+ */
+ int getCenterChunkX();
+
+ /**
+ * Get the X-coordinate of the block in the center of this {@link ProtoWorld}
+ *
+ * @return The center chunk's X coordinate.
+ */
+ default int getCenterBlockX() {
+ return getCenterChunkX() << 4;
+ }
+
+ /**
+ * Get the Z-coordinate of the chunk in the center of this {@link ProtoWorld}
+ *
+ * @return The center chunk's Z coordinate.
+ */
+ int getCenterChunkZ();
+
+ /**
+ * Get the Z-coordinate of the block in the center of this {@link ProtoWorld}
+ *
+ * @return The center chunk's Z coordinate.
+ */
+ default int getCenterBlockZ() {
+ return getCenterChunkZ() << 4;
+ }
+
+ /**
+ * Creates an entity at the location represented by the given {@link Vector}
+ *
+ * @param loc The {@link Vector} representing the location to spawn the entity
+ * @param type The entity to spawn
+ * @return Resulting Entity of this method
+ */
+ @NotNull
+ default Entity spawnEntity(@NotNull Vector loc, @NotNull EntityType type) {
+ return spawn(loc, type.getEntityClass(), CreatureSpawnEvent.SpawnReason.DEFAULT);
+ }
+
+ /**
+ * Spawn an entity of a specific class at location represented by the given {@link Vector}
+ *
+ * @param location The {@link Vector} representing the location to spawn the entity at
+ * @param clazz The class of the {@link Entity} to spawn
+ * @param <T> The class of the {@link Entity} to spawn
+ * @return An instance of the spawned {@link Entity}
+ * @throws IllegalArgumentException if either parameter is null or the
+ * {@link Entity} requested cannot be spawned
+ */
+ @NotNull
+ default <T extends Entity> T spawn(@NotNull Vector location, @NotNull Class<T> clazz) throws IllegalArgumentException {
+ return spawn(location, clazz, CreatureSpawnEvent.SpawnReason.DEFAULT, null);
+ }
+
+ /**
+ * Spawn an entity of a specific class at location represented by the given {@link Vector}
+ *
+ * @param location The {@link Vector} representing the location to spawn the entity at
+ * @param clazz The class of the {@link Entity} to spawn
+ * @param <T> The class of the {@link Entity} to spawn
+ * @param reason The reason for the entity's spawn.
+ * @return An instance of the spawned {@link Entity}
+ * @throws IllegalArgumentException if either parameter is null or the
+ * {@link Entity} requested cannot be spawned
+ */
+ @NotNull
+ default <T extends Entity> T spawn(@NotNull Vector location, @NotNull Class<T> clazz, @NotNull CreatureSpawnEvent.SpawnReason reason) throws IllegalArgumentException {
+ return spawn(location, clazz, reason, null);
+ }
+
+ /**
+ * Spawn an entity of a specific class at the location represented by the given {@link Vector}, with
+ * the supplied function run before the entity is added to the world.
+ * <br>
+ * Note that when the function is run, the entity will not be actually in
+ * the world. Any operation involving such as teleporting the entity is undefined
+ * until after this function returns.
+ *
+ * @param location The {@link Vector} representing the location to spawn the entity at
+ * @param clazz The class of the {@link Entity} to spawn
+ * @param function The function to be run before the entity is spawned.
+ * @param <T> The class of the {@link Entity} to spawn
+ * @return An instance of the spawned {@link Entity}
+ * @throws IllegalArgumentException if either parameter is null or the
+ * {@link Entity} requested cannot be spawned
+ */
+ @NotNull
+ default <T extends Entity> T spawn(@NotNull Vector location, @NotNull Class<T> clazz, @Nullable Consumer<T> function) throws IllegalArgumentException {
+ return spawn(location, clazz, CreatureSpawnEvent.SpawnReason.CUSTOM, function);
+ }
+
+ /**
+ * Spawn an entity of a specific class at the location represented by the given {@link Vector}, with
+ * the supplied function run before the entity is added to the world.
+ * <br>
+ * Note that when the function is run, the entity will not be actually in
+ * the world. Any operation involving such as teleporting the entity is undefined
+ * until after this function returns.
+ *
+ * @param location The {@link Vector} representing the location to spawn the entity at
+ * @param clazz The class of the {@link Entity} to spawn
+ * @param reason The reason for the entity's spawn.
+ * @param function The function to be run before the entity is spawned.
+ * @param <T> The class of the {@link Entity} to spawn
+ * @return An instance of the spawned {@link Entity}
+ * @throws IllegalArgumentException if either parameter is null or the
+ * {@link Entity} requested cannot be spawned
+ */
+ @NotNull
+ default <T extends Entity> T spawn(@NotNull Vector location, @NotNull Class<T> clazz, @NotNull CreatureSpawnEvent.SpawnReason reason, @Nullable Consumer<T> function) throws IllegalArgumentException {
+ return spawn(location, clazz, function, reason);
+ }
+
+ /**
+ * Creates an entity at the location represented by the given {@link Vector}
+ *
+ * @param loc The {@link Vector} representing the location to spawn the entity
+ * @param type The entity to spawn
+ * @param reason The reason for the entity's spawn.
+ * @return Resulting Entity of this method
+ */
+ @SuppressWarnings("unchecked")
+ @NotNull
+ default Entity spawnEntity(@NotNull Vector loc, @NotNull EntityType type, @NotNull CreatureSpawnEvent.SpawnReason reason) {
+ return spawn(loc, (Class<Entity>) type.getEntityClass(), reason, null);
+ }
+
+ /**
+ * Creates an entity at the location represented by the given {@link Vector}, with
+ * the supplied function run before the entity is added to the world.
+ * <br>
+ * Note that when the function is run, the entity will not be actually in
+ * the world. Any operation involving such as teleporting the entity is undefined
+ * until after this function returns.
+ *
+ * @param loc The {@link Vector} representing the location to spawn the entity
+ * @param type The entity to spawn
+ * @param reason The reason for the entity's spawn.
+ * @param function The function to be run before the entity is spawned.
+ * @return Resulting Entity of this method
+ */
+ @SuppressWarnings("unchecked")
+ @NotNull
+ default Entity spawnEntity(@NotNull Vector loc, @NotNull EntityType type, @NotNull CreatureSpawnEvent.SpawnReason reason, @Nullable Consumer<Entity> function) {
+ return spawn(loc, (Class<Entity>) type.getEntityClass(), reason, function);
+ }
+
+ @NotNull <T extends Entity> T spawn(@NotNull Vector location, @NotNull Class<T> clazz, @Nullable Consumer<T> function, @NotNull CreatureSpawnEvent.SpawnReason reason) throws IllegalArgumentException;
+}
diff --git a/src/main/java/org/bukkit/generator/ChunkGenerator.java b/src/main/java/org/bukkit/generator/ChunkGenerator.java
index 244a8a93c35d5a84e17672ff745051587bca384c..e547f324790ca27dfb85b030988fc03bfc6107f1 100644
--- a/src/main/java/org/bukkit/generator/ChunkGenerator.java
+++ b/src/main/java/org/bukkit/generator/ChunkGenerator.java
@@ -161,6 +161,19 @@ public abstract class ChunkGenerator {
return new ArrayList<BlockPopulator>();
}
+
+ // Paper start
+ /**
+ * Generate decorations in a chunk, with quick access to its neighbors.
+ *
+ * @param world ProtoWorld to generate decorations with.
+ */
+ @SuppressWarnings("unused")
+ public void generateDecorations(@NotNull io.papermc.paper.world.generation.ProtoWorld world) {
+ // Do nothing by default to maintain compatibility with existing generators.
+ }
+ // Paper end
+
/**
* Gets a fixed spawn location to use for a given world.
* <p>
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