Cherry-pick WNA, minor changes. 1.16 VERY WIP

First noticed incident of operations ruining ChunkSections. Do not build and use this unless you're testing.

Rushed some of the changes, gotta sleep. Would be nice to get a review of this one from @mattbdev and @dordsor21

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_16_1/BlockMaterial_1_16_1.java

@@ -23,7 +23,7 @@ public class BlockMaterial_1_16_1 implements BlockMaterial {
         this.material = defaultState.getMaterial();
         this.craftBlockData = CraftBlockData.fromData(defaultState);
         this.craftMaterial = craftBlockData.getMaterial();
-        this.isTranslucent = !(boolean) ReflectionUtil.getField(Block.class, block, "v"); //TODO Update Mapping for 1.16.1
+        this.isTranslucent = !(boolean) ReflectionUtil.getField(Block.class, block, "at"); //TODO Update Mapping for 1.16.1
     }
 
     public Block getBlock() {

worldedit-bukkit/src/main/java/com/boydti/fawe/bukkit/adapter/mc1_16_1/FAWEWorldNativeAccess_1_16.java

@@ -0,0 +1,174 @@
+package com.boydti.fawe.bukkit.adapter.mc1_16_1;
+
+import com.sk89q.jnbt.CompoundTag;
+import com.sk89q.worldedit.WorldEditException;
+import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.bukkit.adapter.impl.FAWE_Spigot_v1_16_R1;
+import com.sk89q.worldedit.internal.block.BlockStateIdAccess;
+import com.sk89q.worldedit.internal.wna.WorldNativeAccess;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.util.SideEffect;
+import com.sk89q.worldedit.util.SideEffectSet;
+import com.sk89q.worldedit.world.block.BlockState;
+import com.sk89q.worldedit.world.block.BlockStateHolder;
+import net.minecraft.server.v1_16_R1.Block;
+import net.minecraft.server.v1_16_R1.BlockPosition;
+import net.minecraft.server.v1_16_R1.Chunk;
+import net.minecraft.server.v1_16_R1.ChunkProviderServer;
+import net.minecraft.server.v1_16_R1.EnumDirection;
+import net.minecraft.server.v1_16_R1.IBlockData;
+import net.minecraft.server.v1_16_R1.NBTBase;
+import net.minecraft.server.v1_16_R1.NBTTagCompound;
+import net.minecraft.server.v1_16_R1.PlayerChunk;
+import net.minecraft.server.v1_16_R1.TileEntity;
+import net.minecraft.server.v1_16_R1.World;
+import org.bukkit.craftbukkit.v1_16_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_16_R1.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockPhysicsEvent;
+
+import javax.annotation.Nullable;
+import java.lang.ref.WeakReference;
+import java.util.Objects;
+
+public class FAWEWorldNativeAccess_1_16 implements WorldNativeAccess<Chunk, IBlockData, BlockPosition> {
+    private static final int UPDATE = 1, NOTIFY = 2;
+
+    private final FAWE_Spigot_v1_16_R1 adapter;
+    private final WeakReference<World> world;
+    private SideEffectSet sideEffectSet;
+
+    public FAWEWorldNativeAccess_1_16(FAWE_Spigot_v1_16_R1 adapter, WeakReference<World> world) {
+        this.adapter = adapter;
+        this.world = world;
+    }
+
+    private World getWorld() {
+        return Objects.requireNonNull(world.get(), "The reference to the world was lost");
+    }
+
+    @Override
+    public void setCurrentSideEffectSet(SideEffectSet sideEffectSet) {
+        this.sideEffectSet = sideEffectSet;
+    }
+
+    @Override
+    public Chunk getChunk(int x, int z) {
+        return getWorld().getChunkAt(x, z);
+    }
+
+    @Override
+    public IBlockData toNative(BlockState state) {
+        int stateId = BlockStateIdAccess.getBlockStateId(state);
+        return BlockStateIdAccess.isValidInternalId(stateId)
+                ? Block.getByCombinedId(stateId)
+                : ((CraftBlockData) BukkitAdapter.adapt(state)).getState();
+    }
+
+    @Override
+    public IBlockData getBlockState(Chunk chunk, BlockPosition position) {
+        return chunk.getType(position);
+    }
+
+    @Nullable
+    @Override
+    public IBlockData setBlockState(Chunk chunk, BlockPosition position, IBlockData state) {
+        return chunk.setType(position, state, false);
+    }
+
+    @Override
+    public IBlockData getValidBlockForPosition(IBlockData block, BlockPosition position) {
+        return Block.b(block, getWorld(), position);
+    }
+
+    @Override
+    public BlockPosition getPosition(int x, int y, int z) {
+        return new BlockPosition(x, y, z);
+    }
+
+    @Override
+    public void updateLightingForBlock(BlockPosition position) {
+        getWorld().getChunkProvider().getLightEngine().a(position);
+    }
+
+    @Override
+    public boolean updateTileEntity(BlockPosition position, CompoundTag tag) {
+        // We will assume that the tile entity was created for us,
+        // though we do not do this on the other versions
+        TileEntity tileEntity = getWorld().getTileEntity(position);
+        if (tileEntity == null) {
+            return false;
+        }
+        NBTBase nativeTag = adapter.fromNative(tag);
+        tileEntity.load(tileEntity.getBlock(), (NBTTagCompound) nativeTag);
+        return true;
+    }
+
+    @Override
+    public void notifyBlockUpdate(BlockPosition position, IBlockData oldState, IBlockData newState) {
+        getWorld().notify(position, oldState, newState, UPDATE | NOTIFY);
+    }
+
+    @Override
+    public boolean isChunkTicking(Chunk chunk) {
+        return chunk.getState().isAtLeast(PlayerChunk.State.TICKING);
+    }
+
+    @Override
+    public void markBlockChanged(BlockPosition position) {
+        ((ChunkProviderServer) getWorld().getChunkProvider()).flagDirty(position);
+    }
+
+    private static final EnumDirection[] NEIGHBOUR_ORDER = {
+            EnumDirection.WEST, EnumDirection.EAST,
+            EnumDirection.DOWN, EnumDirection.UP,
+            EnumDirection.NORTH, EnumDirection.SOUTH
+    };
+
+    @Override
+    public void notifyNeighbors(BlockPosition pos, IBlockData oldState, IBlockData newState) {
+        World world = getWorld();
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            world.update(pos, oldState.getBlock());
+        } else {
+            // When we don't want events, manually run the physics without them.
+            // Un-nest neighbour updating
+            for (EnumDirection direction : NEIGHBOUR_ORDER) {
+                BlockPosition shifted = pos.shift(direction);
+                world.getType(shifted).doPhysics(world, shifted, oldState.getBlock(), pos, false);
+            }
+        }
+        if (newState.isComplexRedstone()) {
+            world.updateAdjacentComparators(pos, newState.getBlock());
+        }
+    }
+
+    @Override
+    public void updateNeighbors(BlockPosition pos, IBlockData oldState, IBlockData newState, int recursionLimit) {
+        World world = getWorld();
+        // a == updateNeighbors
+        // b == updateDiagonalNeighbors
+        oldState.b(world, pos, NOTIFY, recursionLimit);
+        if (sideEffectSet.shouldApply(SideEffect.EVENTS)) {
+            CraftWorld craftWorld = world.getWorld();
+            if (craftWorld != null) {
+                BlockPhysicsEvent event = new BlockPhysicsEvent(craftWorld.getBlockAt(pos.getX(), pos.getY(), pos.getZ()), CraftBlockData.fromData(newState));
+                world.getServer().getPluginManager().callEvent(event);
+                if (event.isCancelled()) {
+                    return;
+                }
+            }
+        }
+        newState.a(world, pos, NOTIFY, recursionLimit);
+        newState.b(world, pos, NOTIFY, recursionLimit);
+    }
+
+    @Override
+    public void onBlockStateChange(BlockPosition pos, IBlockData oldState, IBlockData newState) {
+        getWorld().a(pos, oldState, newState);
+    }
+
+    @Override
+    public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 position, B block, SideEffectSet sideEffects) throws WorldEditException {
+        return this.adapter.setBlock(this.getChunk(position.getBlockX() >> 4, position.getBlockZ() >> 4).bukkitChunk, position.getBlockX(), position.getBlockY(), position.getBlockZ(), block, sideEffectSet.shouldApply(SideEffect.LIGHTING));
+    }
+}