Send Lighting Immediately

demo/src/main/java/net/minestom/demo/Main.java

@@ -71,6 +71,7 @@ public static void main(String[] args) {
         commandManager.register(new ConfigCommand());
         commandManager.register(new SidebarCommand());
         commandManager.register(new SetEntityType());
+        commandManager.register(new RelightCommand());
 
         commandManager.setUnknownCommandCallback((sender, command) -> sender.sendMessage(Component.text("Unknown command", NamedTextColor.RED)));
 

demo/src/main/java/net/minestom/demo/PlayerInit.java

@@ -170,8 +170,16 @@ public class PlayerInit {
         InstanceManager instanceManager = MinecraftServer.getInstanceManager();
 
         InstanceContainer instanceContainer = instanceManager.createInstanceContainer(DimensionType.OVERWORLD);
-        instanceContainer.setGenerator(unit -> unit.modifier().fillHeight(0, 40, Block.STONE));
+        instanceContainer.setGenerator(unit -> {
+            unit.modifier().fillHeight(0, 40, Block.STONE);
+
+            if (unit.absoluteStart().blockY() < 40 && unit.absoluteEnd().blockY() > 40) {
+                unit.modifier().setBlock(unit.absoluteStart().blockX(), 40, unit.absoluteStart().blockZ(), Block.TORCH);
+            }
+        });
         instanceContainer.setChunkSupplier(LightingChunk::new);
+        instanceContainer.setTimeRate(0);
+        instanceContainer.setTime(18000);
 
 //        var i2 = new InstanceContainer(UUID.randomUUID(), DimensionType.OVERWORLD, null, NamespaceID.from("minestom:demo"));
 //        instanceManager.registerInstance(i2);
@@ -185,6 +193,8 @@ public class PlayerInit {
         // CompletableFuture.runAsync(() -> {
         //     CompletableFuture.allOf(chunks.toArray(CompletableFuture[]::new)).join();
         //     System.out.println("load end");
+        //     LightingChunk.relight(instanceContainer, instanceContainer.getChunks());
+        //     System.out.println("light end");
         // });
 
         inventory = new Inventory(InventoryType.CHEST_1_ROW, Component.text("Test inventory"));

demo/src/main/java/net/minestom/demo/commands/RelightCommand.java

@@ -0,0 +1,21 @@
+package net.minestom.demo.commands;
+
+import net.minestom.server.command.builder.Command;
+import net.minestom.server.entity.Player;
+import net.minestom.server.instance.LightingChunk;
+
+public class RelightCommand extends Command {
+    public RelightCommand() {
+        super("relight");
+        setDefaultExecutor((source, args) -> {
+            if (source instanceof Player player) {
+                long start = System.currentTimeMillis();
+                source.sendMessage("Relighting...");
+                LightingChunk.relight(player.getInstance(), player.getInstance().getChunks());
+                source.sendMessage("Relighted " + player.getInstance().getChunks().size() + " chunks in " + (System.currentTimeMillis() - start) + "ms");
+                player.getInstance().getChunks().forEach(chunk -> chunk.sendChunk(player));
+                source.sendMessage("Chunks Received");
+            }
+        });
+    }
+}

src/main/java/net/minestom/server/instance/DynamicChunk.java

@@ -210,24 +210,7 @@ public void reset() {
     }
 
     private @NotNull ChunkDataPacket createChunkPacket() {
-        final NBTCompound heightmapsNBT;
-        // TODO: don't hardcode heightmaps
-        // Heightmap
-        {
-            int dimensionHeight = getInstance().getDimensionType().getHeight();
-            int[] motionBlocking = new int[16 * 16];
-            int[] worldSurface = new int[16 * 16];
-            for (int x = 0; x < 16; x++) {
-                for (int z = 0; z < 16; z++) {
-                    motionBlocking[x + z * 16] = 0;
-                    worldSurface[x + z * 16] = dimensionHeight - 1;
-                }
-            }
-            final int bitsForHeight = MathUtils.bitsToRepresent(dimensionHeight);
-            heightmapsNBT = NBT.Compound(Map.of(
-                    "MOTION_BLOCKING", NBT.LongArray(encodeBlocks(motionBlocking, bitsForHeight)),
-                    "WORLD_SURFACE", NBT.LongArray(encodeBlocks(worldSurface, bitsForHeight))));
-        }
+        final NBTCompound heightmapsNBT = computeHeightmap();
         // Data
 
         final byte[] data;
@@ -238,44 +221,35 @@ public void reset() {
                     }));
         }
 
-        if (this instanceof LightingChunk light) {
-            if (light.lightCache.isValid()) {
-                return new ChunkDataPacket(chunkX, chunkZ,
-                        new ChunkData(heightmapsNBT, data, entries),
-                        createLightData(true));
-            } else {
-                // System.out.println("Regenerating light for chunk " + chunkX + " " + chunkZ);
-                LightingChunk.updateAfterGeneration(light);
-                return new ChunkDataPacket(chunkX, chunkZ,
-                        new ChunkData(heightmapsNBT, data, entries),
-                        createEmptyLight());
-            }
-        }
-
         return new ChunkDataPacket(chunkX, chunkZ,
                 new ChunkData(heightmapsNBT, data, entries),
-                createLightData(true)
+                createLightData()
         );
     }
 
-    @NotNull UpdateLightPacket createLightPacket() {
-        return new UpdateLightPacket(chunkX, chunkZ, createLightData(false));
+    protected NBTCompound computeHeightmap() {
+        // TODO: don't hardcode heightmaps
+        // Heightmap
+        int dimensionHeight = getInstance().getDimensionType().getHeight();
+        int[] motionBlocking = new int[16 * 16];
+        int[] worldSurface = new int[16 * 16];
+        for (int x = 0; x < 16; x++) {
+            for (int z = 0; z < 16; z++) {
+                motionBlocking[x + z * 16] = 0;
+                worldSurface[x + z * 16] = dimensionHeight - 1;
+            }
+        }
+        final int bitsForHeight = MathUtils.bitsToRepresent(dimensionHeight);
+        return NBT.Compound(Map.of(
+                "MOTION_BLOCKING", NBT.LongArray(encodeBlocks(motionBlocking, bitsForHeight)),
+                "WORLD_SURFACE", NBT.LongArray(encodeBlocks(worldSurface, bitsForHeight))));
     }
 
-    private LightData createEmptyLight() {
-        BitSet skyMask = new BitSet();
-        BitSet blockMask = new BitSet();
-        BitSet emptySkyMask = new BitSet();
-        BitSet emptyBlockMask = new BitSet();
-        List<byte[]> skyLights = new ArrayList<>();
-        List<byte[]> blockLights = new ArrayList<>();
-
-        return new LightData(skyMask, blockMask,
-                emptySkyMask, emptyBlockMask,
-                skyLights, blockLights);
+    @NotNull UpdateLightPacket createLightPacket() {
+        return new UpdateLightPacket(chunkX, chunkZ, createLightData());
     }
 
-    protected LightData createLightData(boolean sendLater) {
+    protected LightData createLightData() {
         BitSet skyMask = new BitSet();
         BitSet blockMask = new BitSet();
         BitSet emptySkyMask = new BitSet();
@@ -346,7 +320,7 @@ private void assertLock() {
             70409299, 70409299, 0, 69273666, 69273666, 0, 68174084, 68174084, 0, Integer.MIN_VALUE,
             0, 5};
 
-    private static long[] encodeBlocks(int[] blocks, int bitsPerEntry) {
+    static long[] encodeBlocks(int[] blocks, int bitsPerEntry) {
         final long maxEntryValue = (1L << bitsPerEntry) - 1;
         final char valuesPerLong = (char) (64 / bitsPerEntry);
         final int magicIndex = 3 * (valuesPerLong - 1);