alfheim lighting engine

src/main/java/net/hoosiertransfer/Alfheim/IChunkLightingData.java

@@ -0,0 +1,21 @@
+package net.hoosiertransfer.Alfheim;
+
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.EnumSkyBlock;
+
+public interface IChunkLightingData {
+
+    short[] alfheim$getNeighborLightChecks();
+
+    void alfheim$setNeighborLightChecks(final short[] data);
+
+    boolean alfheim$isLightInitialized();
+
+    void alfheim$setLightInitialized(final boolean lightInitialized);
+
+    void alfheim$setSkylightUpdatedPublic();
+
+    void alfheim$initNeighborLightChecks();
+
+    byte alfheim$getCachedLightFor(final EnumSkyBlock enumSkyBlock, final BlockPos pos);
+}

src/main/java/net/hoosiertransfer/Alfheim/ILightInfoProvider.java

@@ -0,0 +1,15 @@
+package net.hoosiertransfer.Alfheim;
+
+import net.minecraft.util.EnumFacing;
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.EnumSkyBlock;
+import net.minecraft.world.IBlockAccess;
+
+public interface ILightInfoProvider {
+
+    int alfheim$getLightFor(final IBlockAccess iBlockAccess, final EnumSkyBlock lightType, final BlockPos blockPos);
+
+    boolean alfheim$useNeighborBrightness(final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos);
+
+    int alfheim$getLightOpacity(final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos);
+}

src/main/java/net/hoosiertransfer/Alfheim/ILightLevelProvider.java

@@ -0,0 +1,13 @@
+package net.hoosiertransfer.Alfheim;
+
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.EnumSkyBlock;
+
+/**
+ * @author Luna Lage (Desoroxxx)
+ * @since 1.0
+ */
+public interface ILightLevelProvider {
+
+    int alfheim$getLight(final EnumSkyBlock lightType, final BlockPos blockPos);
+}

src/main/java/net/hoosiertransfer/Alfheim/ILightUpdatesProcessor.java

@@ -0,0 +1,6 @@
+package net.hoosiertransfer.Alfheim;
+
+public interface ILightUpdatesProcessor {
+
+    void alfheim$processLightUpdates();
+}

src/main/java/net/hoosiertransfer/Alfheim/ILightingEngineProvider.java

@@ -0,0 +1,13 @@
+package net.hoosiertransfer.Alfheim;
+
+import net.hoosiertransfer.Alfheim.lighting.LightingEngine;
+
+/**
+ * @author Luna Lage (Desoroxxx)
+ * @author Angeline (@jellysquid)
+ * @since 1.0
+ */
+public interface ILightingEngineProvider {
+
+    LightingEngine alfheim$getLightingEngine();
+}

src/main/java/net/hoosiertransfer/Alfheim/ILitBlock.java

@@ -0,0 +1,13 @@
+package net.hoosiertransfer.Alfheim;
+
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.BlockPos;
+import net.minecraft.util.EnumFacing;
+import net.minecraft.world.EnumSkyBlock;
+import net.minecraft.world.IBlockAccess;
+
+public interface ILitBlock {
+    int alfheim$getLightFor(final IBlockState blockState, final IBlockAccess blockAccess, final EnumSkyBlock lightType, final BlockPos blockPos);
+    boolean alfheim$useNeighborBrightness(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos);
+    int alfheim$getLightOpacity(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos);
+}

src/main/java/net/hoosiertransfer/Alfheim/lighting/LightUtil.java

@@ -0,0 +1,11 @@
+package net.hoosiertransfer.Alfheim.lighting;
+
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.IBlockAccess;
+
+public class LightUtil {
+    public static int getLightValueForState(final IBlockState blockState, final IBlockAccess blockAccess, final BlockPos blockPos) {
+        return blockState.getLightValue(blockAccess, blockPos);
+    }
+}

src/main/java/net/hoosiertransfer/Alfheim/lighting/LightingEngine.java

@@ -0,0 +1,500 @@
+package net.hoosiertransfer.Alfheim.lighting;
+
+import net.hoosiertransfer.Alfheim.IChunkLightingData;
+import net.hoosiertransfer.Alfheim.util.ClampUtil;
+import net.hoosiertransfer.Alfheim.util.DeduplicatedLongQueue;
+import net.hoosiertransfer.teavm.ReentrantLock;
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.client.Minecraft;
+import net.minecraft.profiler.Profiler;
+import net.minecraft.util.BlockPos;
+import net.minecraft.util.EnumFacing;
+import net.minecraft.util.Vec3i;
+import net.minecraft.util.BlockPos.MutableBlockPos;
+import net.minecraft.world.EnumSkyBlock;
+import net.minecraft.world.World;
+import net.minecraft.world.chunk.Chunk;
+import net.minecraft.world.chunk.storage.ExtendedBlockStorage;
+
+public class LightingEngine {
+    private static final byte MAX_LIGHT_LEVEL = 15;
+
+    private final Thread ownerThread = Thread.currentThread();
+
+    private final World world;
+
+    private final Profiler profiler;
+
+    private final DeduplicatedLongQueue[] lightUpdateQueues = new DeduplicatedLongQueue[EnumSkyBlock.values().length];
+
+    private final DeduplicatedLongQueue[] darkeningQueues = new DeduplicatedLongQueue[MAX_LIGHT_LEVEL + 1];
+    private final DeduplicatedLongQueue[] brighteningQueues = new DeduplicatedLongQueue[MAX_LIGHT_LEVEL + 1];
+
+    private final DeduplicatedLongQueue initialBrightenings;
+    private final DeduplicatedLongQueue initialDarkenings;
+
+    private boolean updating = false;
+
+    private static final int
+            L_X = 26,
+            L_Y = 8,
+            L_Z = 26,
+            L_L = 4;
+
+    private static final int
+        S_Z = 0,
+        S_X = S_Z + L_Z,
+        S_Y = S_X + L_X,
+        S_L = S_Y + L_Y;
+
+    private static final long
+        M_X = (1L << L_X) - 1,
+        M_Y = (1L << L_Y) - 1,
+        M_Z = (1L << L_Z) - 1,
+        M_L = (1L << L_L) - 1,
+        M_POS = (M_Y << S_Y) | (M_X << S_X) | (M_Z << S_Z);
+
+    private static final long Y_CHECK = 1L << (S_Y + L_Y);
+
+    private static final long[] neighborShifts = new long[6];
+
+    static {
+        for (byte i = 0; i < 6; ++i) {
+            final Vec3i offset = EnumFacing._VALUES[i].getDirectionVec();
+            neighborShifts[i] = ((long) offset.getY() << S_Y) | ((long) offset.getX() << S_X) | ((long) offset.getZ() << S_Z);
+        }
+    }
+
+    private static final long M_CHUNK = ((M_X >> 4) << (4 + S_X)) | ((M_Z >> 4) << (4 + S_Z));
+
+    private final MutableBlockPos currentPos = new MutableBlockPos();
+    private Chunk currentChunk;
+    private long currentChunkIdentifier;
+    private long currentData;
+
+    private boolean isNeighborDataValid = false;
+
+    private final NeighborInfo[] neighborInfos = new NeighborInfo[6];
+    private DeduplicatedLongQueue currentQueue;
+
+    private ReentrantLock lock = new ReentrantLock();
+
+    public LightingEngine(final World world) {
+        this.world = world;
+        profiler = world.theProfiler;
+
+        initialBrightenings = new DeduplicatedLongQueue(16384);
+        initialDarkenings = new DeduplicatedLongQueue(16384);
+
+        for (int i = 0; i < EnumSkyBlock.values().length; ++i)
+            lightUpdateQueues[i] = new DeduplicatedLongQueue(16384);
+
+        for (int i = 0; i < darkeningQueues.length; ++i)
+            darkeningQueues[i] = new DeduplicatedLongQueue(16384);
+
+        for (int i = 0; i < brighteningQueues.length; ++i)
+            brighteningQueues[i] = new DeduplicatedLongQueue(16384);
+
+        for (int i = 0; i < neighborInfos.length; ++i)
+            neighborInfos[i] = new NeighborInfo();
+    }
+
+    public void scheduleLightUpdate(final EnumSkyBlock lightType, final BlockPos pos) {
+        lock();
+
+        try {
+            scheduleLightUpdate(lightType, encodeWorldCoord(pos));
+        } finally {
+            lock.unlock();
+        }
+    }
+
+    private void scheduleLightUpdate(final EnumSkyBlock lightType, final long blockPos) {
+        lightUpdateQueues[lightType.ordinal()].enqueue(blockPos);
+    }
+
+    public void processLightUpdatesForType(final EnumSkyBlock lightType) {
+        // We only want to perform updates if we're being called from a tick event on the client.
+        // There are many locations in the client code that will end up making calls to this method, usually from other threads.
+        if (world.isRemote && !isCallingFromMainThread())
+            return;
+
+        final DeduplicatedLongQueue queue = lightUpdateQueues[lightType.ordinal()];
+
+        // Quickly check if the queue is empty before we acquire a more expensive lock.
+        if (queue.isEmpty())
+            return;
+
+        profiler.startSection("process");
+
+        lock();
+
+        try {
+            processLightUpdatesForTypeInner(lightType, queue);
+        } finally {
+            lock.unlock();
+        }
+
+        profiler.endSection();
+    }
+
+    private boolean isCallingFromMainThread() {
+        return Minecraft.getMinecraft().isCallingFromMinecraftThread();
+    }
+
+    public void processLightUpdates() {
+        profiler.startSection("processSky");
+
+        processLightUpdatesForType(EnumSkyBlock.SKY);
+
+        profiler.endStartSection("processBlock");
+
+        processLightUpdatesForType(EnumSkyBlock.BLOCK);
+
+        profiler.endSection();
+    }
+
+    private void lock() {
+        if (lock.tryLock())
+            return;
+
+        // If we cannot lock, something has gone wrong... Only one thread should ever acquire the lock.
+        // Validate that we're on the right thread immediately, so we can gather information.
+        // It is NEVER valid to call World methods from a thread other than the owning thread of the world instance.
+        final Thread current = Thread.currentThread();
+
+        if (current != ownerThread) {
+            final IllegalAccessException illegalAccessException = new IllegalAccessException(String.format("World is owned by '%s' (ID: %s)," + " but was accessed from thread '%s' (ID: %s)", ownerThread.getName(), ownerThread.getId(), current.getName(), current.getId()));
+
+            System.out.println(
+                    "Something (likely another mod) has attempted to modify the world's state from the wrong thread!\n" +
+                            "This is *bad practice* and can cause severe issues in your game.\n" +
+                            "Alfheim has done as best as it can to mitigate this violation, but it may negatively impact performance or introduce stalls.\n" +
+                            "In a future release, this violation may result in a hard crash instead of the current soft warning.\n" +
+                            "You should report this issue to our issue tracker with the following stacktrace information.");
+            
+            illegalAccessException.printStackTrace();
+
+        }
+
+        // Wait for the lock to be released. This will likely introduce unwanted stalls, but will mitigate the issue.
+        lock.lock();
+    }
+
+    private void processLightUpdatesForTypeInner(final EnumSkyBlock lightType, final DeduplicatedLongQueue queue) {
+        // Avoid nested calls
+        if (updating)
+            throw new IllegalStateException("Already processing updates!");
+
+        updating = true;
+
+        currentChunkIdentifier = -1; // Reset chunk cache
+
+        currentQueue = queue;
+
+        if (currentQueue != null)
+            currentQueue.clearSet();
+
+        profiler.startSection("prepare");
+
+        // Process the queued updates and enqueue them for further processing
+        while (nextItem()) {
+            if (currentChunk == null)
+                continue;
+
+            final byte oldLight = getCursorCachedLight(lightType);
+            final byte newLight = calculateNewLightFromCursor(lightType);
+
+            if (oldLight < newLight)
+                initialBrightenings.enqueue(((long) newLight << S_L) | currentData); // Don't enqueue directly for brightening to avoid duplicate scheduling
+            else if (oldLight > newLight)
+                initialDarkenings.enqueue(currentData); // Don't enqueue directly for darkening to avoid duplicate scheduling
+        }
+
+        profiler.endStartSection("enqueueBrightening");
+
+        currentQueue = initialBrightenings;
+
+        if (currentQueue != null)
+            currentQueue.clearSet();
+
+        while (nextItem()) {
+            final byte newLight = (byte) (currentData >> S_L & M_L);
+
+            if (newLight > getCursorCachedLight(lightType))
+                enqueueBrightening(currentPos, currentData & M_POS, newLight, currentChunk, lightType); // Sets the light to newLight to only schedule once. Clear leading bits of curData for later
+        }
+
+        profiler.endStartSection("enqueueDarkening");
+
+        currentQueue = initialDarkenings;
+
+        if (currentQueue != null)
+            currentQueue.clearSet();
+
+        while (nextItem()) {
+            final byte oldLight = getCursorCachedLight(lightType);
+
+            if (oldLight != 0)
+                enqueueDarkening(currentPos, currentData, oldLight, currentChunk, lightType); // Sets the light to zero to only schedule once
+        }
+
+        profiler.endStartSection("process");
+
+        // Iterate through enqueued updates (brightening and darkening in parallel) from brightest to darkest so that we only need to iterate once
+        for (byte currentLight = MAX_LIGHT_LEVEL; currentLight >= 0; --currentLight) {
+            currentQueue = darkeningQueues[currentLight];
+
+            if (currentQueue != null)
+                currentQueue.clearSet();
+
+            while (nextItem()) {
+                // Don't darken if we got brighter due to some other change
+                if (getCursorCachedLight(lightType) >= currentLight)
+                    continue;
+
+                final IBlockState blockState = currentChunk.getBlockState(currentPos);
+                final byte luminosity = getCursorLuminosity(blockState, lightType);
+                final byte opacity; // If luminosity is high enough, opacity is irrelevant
+
+                if (luminosity >= MAX_LIGHT_LEVEL - 1)
+                    opacity = 1;
+                else
+                    opacity = getPosOpacity(currentPos, blockState);
+
+                // Only darken neighbors if we indeed became darker
+                if (calculateNewLightFromCursor(luminosity, opacity, lightType) < currentLight) {
+                    // Need to calculate new light value from neighbors IGNORING neighbors which are scheduled for darkening
+                    byte newLight = luminosity;
+
+                    fetchNeighborDataFromCursor(lightType);
+
+                    for (final NeighborInfo neighborInfo : neighborInfos) {
+                        final Chunk neighborChunk = neighborInfo.chunk;
+
+                        if (neighborChunk == null)
+                            continue;
+
+                        final byte neighborLight = neighborInfo.light;
+
+                        if (neighborLight == 0)
+                            continue;
+
+                        final MutableBlockPos neighborPos = neighborInfo.mutableBlockPos;
+
+                        if (currentLight - getPosOpacity(neighborPos, neighborChunk.getBlockState(neighborPos)) >= neighborLight) /*Schedule neighbor for darkening if we possibly light it*/ {
+                            enqueueDarkening(neighborPos, neighborInfo.key, neighborLight, neighborChunk, lightType);
+                        } else /*Only use for new light calculation if not*/ {
+                            // If we can't darken the neighbor, no one else can (because of processing order) -> safe to let us be illuminated by it
+                            newLight = (byte) Math.max(newLight, neighborLight - opacity);
+                        }
+                    }
+
+                    // Schedule brightening since light level was set to 0
+                    enqueueBrighteningFromCursor(newLight, lightType);
+                } else /*We didn't become darker, so we need to re-set our initial light value (was set to zero) and notify neighbors*/ {
+                    enqueueBrighteningFromCursor(currentLight, lightType); // Do not spread to neighbors immediately to avoid scheduling multiple times
+                }
+            }
+
+            currentQueue = brighteningQueues[currentLight];
+
+            if (currentQueue != null)
+                currentQueue.clearSet();
+
+            while (nextItem()) {
+                final byte oldLight = getCursorCachedLight(lightType);
+
+                // Only process this if nothing else has happened at this position since scheduling
+                if (oldLight == currentLight) {
+                    world.notifyLightSet(currentPos);
+
+                    if (currentLight > 1)
+                        spreadLightFromCursor(currentLight, lightType);
+                }
+            }
+        }
+
+        profiler.endSection();
+
+        updating = false;
+    }
+
+    private void fetchNeighborDataFromCursor(final EnumSkyBlock lightType) {
+        // Only update if curPos was changed
+        if (isNeighborDataValid)
+            return;
+
+        isNeighborDataValid = true;
+
+        for (int i = 0; i < neighborInfos.length; ++i) {
+            final NeighborInfo neighborInfo = neighborInfos[i];
+            final long neighborLongPos = neighborInfo.key = currentData + neighborShifts[i];
+
+            if ((neighborLongPos & Y_CHECK) != 0) {
+                neighborInfo.chunk = null;
+                continue;
+            }
+
+            final MutableBlockPos neighborPos = decodeWorldCoord(neighborInfo.mutableBlockPos, neighborLongPos);
+
+            final Chunk neighborChunk;
+
+            if ((neighborLongPos & M_CHUNK) == currentChunkIdentifier)
+                neighborChunk = neighborInfo.chunk = currentChunk;
+            else
+                neighborChunk = neighborInfo.chunk = getChunk(neighborPos);
+
+            if (neighborChunk != null) {
+                final ExtendedBlockStorage neighborSection = neighborChunk.getBlockStorageArray()[neighborPos.getY() >> 4];
+
+                neighborInfo.light = getCachedLightFor(neighborChunk, neighborSection, neighborPos, lightType);
+            }
+        }
+    }
+
+    private static byte getCachedLightFor(final Chunk chunk, final ExtendedBlockStorage storage, final BlockPos blockPos, final EnumSkyBlock type) {
+        final int x = blockPos.getX() & 15;
+        final int y = blockPos.getY();
+        final int z = blockPos.getZ() & 15;
+
+        if (storage == Chunk.NULL_BLOCK_STORAGE)
+            return type == EnumSkyBlock.SKY && chunk.canSeeSky(blockPos) ? (byte) type.defaultLightValue : 0;
+        else if (type == EnumSkyBlock.SKY)
+            return !chunk.getWorld().provider.getHasNoSky() ? (byte) storage.getExtSkylightValue(x, y & 15, z) : 0;
+        else
+            return type == EnumSkyBlock.BLOCK ? (byte) storage.getExtBlocklightValue(x, y & 15, z) : (byte) type.defaultLightValue;
+    }
+
+    private byte calculateNewLightFromCursor(final EnumSkyBlock lightType) {
+        final IBlockState blockState = currentChunk.getBlockState(currentPos);
+
+        final byte luminosity = getCursorLuminosity(blockState, lightType);
+        final byte opacity;
+
+        if (luminosity >= MAX_LIGHT_LEVEL - 1)
+            opacity = 1;
+        else
+            opacity = getPosOpacity(currentPos, blockState);
+
+        return calculateNewLightFromCursor(luminosity, opacity, lightType);
+    }
+
+    private byte calculateNewLightFromCursor(final byte luminosity, final byte opacity, final EnumSkyBlock lightType) {
+        if (luminosity >= MAX_LIGHT_LEVEL - opacity)
+            return luminosity;
+
+        byte newLight = luminosity;
+
+        fetchNeighborDataFromCursor(lightType);
+
+        for (final NeighborInfo neighborInfo : neighborInfos) {
+            if (neighborInfo.chunk == null)
+                continue;
+
+            newLight = (byte) Math.max(neighborInfo.light - opacity, newLight);
+        }
+
+        return newLight;
+    }
+
+    private void spreadLightFromCursor(final byte currentLight, final EnumSkyBlock lightType) {
+        fetchNeighborDataFromCursor(lightType);
+
+        for (final NeighborInfo neighborInfo : neighborInfos) {
+            final Chunk neighborChunk = neighborInfo.chunk;
+
+            if (neighborChunk == null || currentLight < neighborInfo.light)
+                continue;
+
+            final BlockPos neighborBlockPos = neighborInfo.mutableBlockPos;
+
+            final byte newLight = (byte) (currentLight - getPosOpacity(neighborBlockPos, neighborChunk.getBlockState(neighborBlockPos)));
+
+            if (newLight > neighborInfo.light)
+                enqueueBrightening(neighborBlockPos, neighborInfo.key, newLight, neighborChunk, lightType);
+        }
+    }
+
+    private void enqueueBrighteningFromCursor(final byte newLight, final EnumSkyBlock lightType) {
+        enqueueBrightening(currentPos, currentData, newLight, currentChunk, lightType);
+    }
+
+    private void enqueueBrightening(final BlockPos blockPos, final long longPos, final byte newLight, final Chunk chunk, final EnumSkyBlock lightType) {
+        brighteningQueues[newLight].enqueue(longPos);
+
+        chunk.setLightFor(lightType, blockPos, newLight);
+    }
+
+    private void enqueueDarkening(final BlockPos blockPos, final long longPos, final byte oldLight, final Chunk chunk, final EnumSkyBlock lightType) {
+        darkeningQueues[oldLight].enqueue(longPos);
+
+        chunk.setLightFor(lightType, blockPos, 0);
+    }
+
+    private static MutableBlockPos decodeWorldCoord(final MutableBlockPos mutableBlockPos, final long longPos) {
+        return mutableBlockPos.setPos((int) (longPos >> S_X & M_X) - (1 << L_X - 1), (int) (longPos >> S_Y & M_Y), (int) (longPos >> S_Z & M_Z) - (1 << L_Z - 1));
+    }
+
+    private static long encodeWorldCoord(final BlockPos pos) {
+        return ((long) pos.getY() << S_Y) | ((long) pos.getX() + (1 << L_X - 1) << S_X) | ((long) pos.getZ() + (1 << L_Z - 1) << S_Z);
+    }
+
+    private boolean nextItem() {
+        if (currentQueue.isEmpty()) {
+            currentQueue = null;
+
+            return false;
+        }
+
+        currentData = currentQueue.dequeue();
+        isNeighborDataValid = false;
+
+        decodeWorldCoord(currentPos, currentData);
+
+        final long chunkIdentifier = currentData & M_CHUNK;
+
+        if (currentChunkIdentifier != chunkIdentifier) {
+            currentChunk = getChunk(currentPos);
+            currentChunkIdentifier = chunkIdentifier;
+        }
+
+        return true;
+    }
+
+    private byte getCursorCachedLight(final EnumSkyBlock lightType) {
+        return currentChunk.alfheim$getCachedLightFor(lightType, currentPos);
+        // return ((IChunkLightingData) currentChunk).alfheim$getCachedLightFor(lightType, currentPos); // OK TEAVM YOU ARE THE WORST THING I HAVE HAD TO WORK WITH YET
+    }
+
+    private byte getCursorLuminosity(final IBlockState state, final EnumSkyBlock lightType) {
+        if (lightType == EnumSkyBlock.SKY) {
+            if (currentChunk.canSeeSky(currentPos))
+                return (byte) EnumSkyBlock.SKY.defaultLightValue;
+            else
+                return 0;
+        }
+
+        return (byte) ClampUtil.clampMinFirst(LightUtil.getLightValueForState(state, world, currentPos), 0, MAX_LIGHT_LEVEL);
+    }
+
+    private byte getPosOpacity(final BlockPos blockPos, final IBlockState blockState) {
+        return (byte) ClampUtil.clampMinFirst(blockState.getBlock().getLightOpacity(), 1, MAX_LIGHT_LEVEL);
+    }
+
+    private Chunk getChunk(final BlockPos blockPos) {
+        return world.getChunkProvider().getLoadedChunk(blockPos.getX() >> 4, blockPos.getZ() >> 4);
+    }
+
+
+    private static final class NeighborInfo {
+
+        public final MutableBlockPos mutableBlockPos = new MutableBlockPos();
+
+        public Chunk chunk;
+
+        public byte light;
+
+        public long key;
+    }
+}

src/main/java/net/hoosiertransfer/Alfheim/util/ClampUtil.java

@@ -0,0 +1,343 @@
+package net.hoosiertransfer.Alfheim.util;
+
+/**
+ * A utility class that offers efficient clamping methods.
+ * <p>
+ * These functions are optimized for speed and provided for every primitive datatype.
+ *
+ * @author Luna Lage (Desoroxxx)
+ * @since 0.5
+ */
+@SuppressWarnings({"unused", "ManualMinMaxCalculation", "DuplicatedCode"})
+public final class ClampUtil {
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static byte clampTest(final byte input, final byte min, final byte max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static short clampTest(final short input, final short min, final short max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static int clampTest(final int input, final int min, final int max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static long clampTest(final long input, final long min, final long max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static float clampTest(final float input, final float min, final float max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     * <p>
+     * This will log the result to check if clampMinFirst or clampMaxFirst should be used.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static double clampTest(final double input, final double min, final double max) {
+        if (input < min) {
+            return min;
+        } else if (input > max) {
+            return max;
+        } else {
+            return input;
+        }
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static byte clampMinFirst(final byte input, final byte min, final byte max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static short clampMinFirst(final short input, final short min, final short max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static int clampMinFirst(final int input, final int min, final int max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static long clampMinFirst(final long input, final long min, final long max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static float clampMinFirst(final float input, final float min, final float max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the minimum value first.
+     * <p>
+     * If the input is less than min, it returns min. If the input is greater than max, it returns max.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     *
+     * @return The clamped value
+     */
+    public static double clampMinFirst(final double input, final double min, final double max) {
+        return input < min ? min : input > max ? max : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static byte clampMaxFirst(final byte input, final byte min, final byte max) {
+        return input > max ? max : input < min ? min : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static short clampMaxFirst(final short input, final short min, final short max) {
+        return input > max ? max : input < min ? min : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static int clampMaxFirst(final int input, final int min, final int max) {
+        return input > max ? max : input < min ? min : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static long clampMaxFirst(final long input, final long min, final long max) {
+        return input > max ? max : input < min ? min : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static float clampMaxFirst(final float input, final float min, final float max) {
+        return input > max ? max : input < min ? min : input;
+    }
+
+    /**
+     * Clamps a value within a specified range [min, max], checking for the maximum value first.
+     * <p>
+     * If the input is greater than max, it returns max. If the input is less than min, it returns min.
+     * Otherwise, it returns the input.
+     *
+     * @param input The input value to clamp
+     * @param min The minimum value to clamp to
+     * @param max The maximum value to clamp to
+     * @return The clamped value
+     */
+    public static double clampMaxFirst(final double input, final double min, final double max) {
+        return input > max ? max : input < min ? min : input;
+    }
+}

src/main/java/net/hoosiertransfer/Alfheim/util/DeduplicatedLongQueue.java

@@ -0,0 +1,61 @@
+package net.hoosiertransfer.Alfheim.util;
+
+import java.util.HashSet;
+import java.util.LinkedList;
+
+/**
+ * A queue implementation for long values that are deduplicated on addition.
+ * <p>
+ * This is achieved by storing the values in a HashSet and a LinkedList.
+ */
+public final class DeduplicatedLongQueue {
+
+    private final HashSet<Long> set;
+    private final LinkedList<Long> queue;
+
+    /**
+     * Creates a new deduplicated queue with the given capacity.
+     *
+     * @param capacity The capacity of the deduplicated queue
+     */
+    public DeduplicatedLongQueue(final int capacity) {
+        set = new HashSet<>(capacity);
+        queue = new LinkedList<>();
+    }
+
+    /**
+     * Adds a value to the queue.
+     *
+     * @param value The value to add to the queue
+     */
+    public void enqueue(final long value) {
+        if (set.add(value))
+            queue.addLast(value);
+    }
+
+    /**
+     * Removes and returns the first value in the queue.
+     *
+     * @return The first value in the queue
+     */
+    public long dequeue() {
+        Long value = queue.removeFirst();
+        return value != null ? value : 0;
+    }
+
+    /**
+     * Returns whether the queue is empty.
+     *
+     * @return {@code true} if the queue is empty, {@code false} otherwise
+     */
+    public boolean isEmpty() {
+        return queue.isEmpty();
+    }
+
+    /**
+     * Clears the deduplication set.
+     */
+    public void clearSet() {
+        set.clear();
+    }
+}

src/main/java/net/hoosiertransfer/Alfheim/util/EnumBoundaryFacing.java

@@ -0,0 +1,6 @@
+package net.hoosiertransfer.Alfheim.util;
+
+public enum EnumBoundaryFacing {
+    IN,
+    OUT
+}

src/main/java/net/hoosiertransfer/Alfheim/util/WorldChunkSlice.java

@@ -0,0 +1,83 @@
+package net.hoosiertransfer.Alfheim.util;
+
+import net.minecraft.world.chunk.Chunk;
+import net.minecraft.world.chunk.IChunkProvider;
+
+/**
+ * Represents a slice of a world containing a collection of chunks.
+ *
+ * @author Luna Lage (Desoroxxx)
+ * @author Angeline (@jellysquid)
+ * @since 1.0
+ */
+public class WorldChunkSlice {
+
+    private static final int DIAMETER = 5;
+    private static final int RADIUS = DIAMETER / 2;
+
+    private final int x, z;
+
+    private final Chunk[] chunks;
+
+    /**
+     * Initializes a {@link WorldChunkSlice} object using a given chunk provider and coordinates.
+     *
+     * @param chunkProvider The chunk provider to get chunks from
+     * @param x The X-coordinate of the center chunk
+     * @param z The Z-coordinate of the center chunk
+     */
+    public WorldChunkSlice(final IChunkProvider chunkProvider, final int x, final int z) {
+        chunks = new Chunk[DIAMETER * DIAMETER];
+
+        for (int xDiff = -RADIUS; xDiff <= RADIUS; xDiff++)
+            for (int zDiff = -RADIUS; zDiff <= RADIUS; zDiff++)
+                chunks[((xDiff + RADIUS) * DIAMETER) + (zDiff + RADIUS)] = chunkProvider.getLoadedChunk(x + xDiff, z + zDiff);
+
+        this.x = x - RADIUS;
+        this.z = z - RADIUS;
+    }
+
+    /**
+     * Checks if all chunks within a radius around a coordinate are loaded.
+     *
+     * @param x The X-coordinate to check around
+     * @param z The Z-coordinate to check around
+     * @param radius The radius around the coordinates to check
+     * @return true if all chunks are loaded, false otherwise
+     */
+    public boolean isLoaded(final int x, final int z, final int radius) {
+        final int xStart = ((x - radius) >> 4) - this.x;
+        final int zStart = ((z - radius) >> 4) - this.z;
+        final int xEnd = ((x + radius) >> 4) - this.x;
+        final int zEnd = ((z + radius) >> 4) - this.z;
+
+        for (int currentX = xStart; currentX <= xEnd; ++currentX)
+            for (int currentZ = zStart; currentZ <= zEnd; ++currentZ)
+                if (getChunk(currentX, currentZ) == null)
+                    return false;
+
+        return true;
+    }
+
+    /**
+     * Retrieves the chunk that includes the provided world coordinates.
+     *
+     * @param x The X-coordinate in the world
+     * @param z The Z-coordinate in the world
+     * @return The Chunk object that includes these coordinates
+     */
+    public Chunk getChunkFromWorldCoords(final int x, final int z) {
+        return getChunk((x >> 4) - this.x, (z >> 4) - this.z);
+    }
+
+    /**
+     * Retrieves the chunk located at the given coordinates within this chunk slice.
+     *
+     * @param x The X-coordinate within the slice
+     * @param z The Z-coordinate within the slice
+     * @return The Chunk object at these coordinates
+     */
+    private Chunk getChunk(final int x, final int z) {
+        return chunks[(x * DIAMETER) + z];
+    }
+}

src/main/java/net/hoosiertransfer/teavm/ReentrantLock.java

@@ -0,0 +1,44 @@
+package net.hoosiertransfer.teavm;
+
+public class ReentrantLock {
+    private Thread owner = null;
+    private int lockCount = 0;
+
+    public synchronized void lock() {
+        Thread callingThread = Thread.currentThread();
+        while (lockCount > 0 && owner != callingThread) {
+            try {
+                wait();
+            } catch (InterruptedException e) {
+                // Handle exception
+            }
+        }
+        owner = callingThread;
+        lockCount++;
+    }
+
+    public synchronized void unlock() {
+        if (Thread.currentThread() == owner) {
+            lockCount--;
+            if (lockCount == 0) {
+                owner = null;
+                notify();
+            }
+        }
+    }
+
+    public synchronized boolean isHeldByCurrentThread() {
+        return owner == Thread.currentThread();
+    }
+
+    public synchronized boolean tryLock() {
+        Thread callingThread = Thread.currentThread();
+        if (lockCount == 0 || owner == callingThread) {
+            owner = callingThread;
+            lockCount++;
+            return true;
+        } else {
+            return false;
+        }
+    }
+}

src/main/java/net/lax1dude/eaglercraft/v1_8/sp/server/EaglerChunkLoader.java

@@ -4,6 +4,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 
+import net.hoosiertransfer.Alfheim.ILightingEngineProvider;
 import net.lax1dude.eaglercraft.v1_8.internal.vfs2.VFile2;
 import net.lax1dude.eaglercraft.v1_8.log4j.LogManager;
 import net.lax1dude.eaglercraft.v1_8.log4j.Logger;
@@ -89,6 +90,7 @@ public class EaglerChunkLoader extends AnvilChunkLoader {
 
 	@Override
 	public void saveChunk(World var1, Chunk var2) throws IOException, MinecraftException {
+		var1.alfheim$getLightingEngine().processLightUpdates();
 		NBTTagCompound chunkData = new NBTTagCompound();
 		this.writeChunkToNBT(var2, var1, chunkData);
 		NBTTagCompound fileData = new NBTTagCompound();

src/main/java/net/minecraft/block/Block.java

@@ -1,6 +1,11 @@
 package net.minecraft.block;
 
 import java.util.List;
+
+import net.hoosiertransfer.Alfheim.ILightInfoProvider;
+import net.hoosiertransfer.Alfheim.ILightLevelProvider;
+import net.hoosiertransfer.Alfheim.ILitBlock;
+import net.hoosiertransfer.Alfheim.util.ClampUtil;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 
 import net.minecraft.block.material.MapColor;
@@ -30,6 +35,7 @@ import net.minecraft.util.RegistryNamespacedDefaultedByKey;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.StatCollector;
 import net.minecraft.util.Vec3;
+import net.minecraft.world.EnumSkyBlock;
 import net.minecraft.world.Explosion;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
@@ -54,7 +60,7 @@ import net.minecraft.world.World;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public class Block {
+public class Block implements ILitBlock {
 	/**+
 	 * ResourceLocation for the Air block
 	 */
@@ -978,7 +984,13 @@ public class Block {
 	 * opacity
 	 */
 	public float getAmbientOcclusionLightValue() {
-		return this.isBlockNormalCube() ? 0.2F : 1.0F;
+		final byte lightValue = (byte) ClampUtil.clampMinFirst(this.getLightValue() - 1, 0, 15);
+
+		if (lightValue == 0) {
+			return this.isBlockNormalCube() ? 0.2F : 1.0F;
+		} else {
+			return 1.0F;
+		}
 	}
 
 	/**+
@@ -1660,4 +1672,40 @@ public class Block {
 	public boolean eaglerShadersShouldRenderGlassHighlights() {
 		return false;
 	}
+
+	public int alfheim$getLightFor(final IBlockState blockState, final IBlockAccess blockAccess, final EnumSkyBlock lightType, final BlockPos blockPos) {
+		int lightLevel = ((ILightLevelProvider) blockAccess).alfheim$getLight(lightType, blockPos);
+
+		if (lightLevel == 15)
+			return lightLevel;
+		
+		if (!blockState.getBlock().getUseNeighborBrightness())
+			return lightLevel;
+
+		for (EnumFacing facing : EnumFacing._VALUES) {
+			if (((ILightInfoProvider) blockState).alfheim$useNeighborBrightness(facing, blockAccess, blockPos)) {
+                int opacity = ((ILightInfoProvider) blockState).alfheim$getLightOpacity(facing, blockAccess, blockPos);
+                final int neighborLightLevel = ((ILightLevelProvider) blockAccess).alfheim$getLight(lightType, blockPos.offset(facing));
+
+                if (opacity == 0 && (lightType != EnumSkyBlock.SKY || neighborLightLevel != EnumSkyBlock.SKY.defaultLightValue))
+                    opacity = 1;
+
+                lightLevel = Math.max(lightLevel, neighborLightLevel - opacity);
+
+                if (lightLevel == 15)
+                    return lightLevel;
+            }
+		}
+
+		return lightLevel;
+	}
+
+	public boolean alfheim$useNeighborBrightness(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos) {
+        return facing == EnumFacing.UP;
+    }
+
+	@Override
+    public int alfheim$getLightOpacity(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos) {
+        return 0;
+    }
 }

src/main/java/net/minecraft/block/BlockSlab.java

@@ -1,6 +1,8 @@
 package net.minecraft.block;
 
 import java.util.List;
+
+import net.hoosiertransfer.Alfheim.ILitBlock;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 
 import net.minecraft.block.material.Material;
@@ -21,6 +23,9 @@ import net.minecraft.util.IStringSerializable;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 
+import static net.minecraft.block.BlockSlab.EnumBlockHalf.TOP;
+
+
 /**+
  * This portion of EaglercraftX contains deobfuscated Minecraft 1.8 source code.
  * 
@@ -41,7 +46,7 @@ import net.minecraft.world.World;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public abstract class BlockSlab extends Block {
+public abstract class BlockSlab extends Block  {
 	public static PropertyEnum<BlockSlab.EnumBlockHalf> HALF;
 
 	public BlockSlab(Material materialIn) {
@@ -204,4 +209,14 @@ public abstract class BlockSlab extends Block {
 		}
 		return super.onBlockActivated(world, blockpos, var3, entityplayer, var5, var6, var7, var8);
 	}
+
+    public boolean alfheim$useNeighborBrightness(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos) {
+        if (facing.getAxis() != EnumFacing.Axis.Y)
+            return false;
+
+        if (((BlockSlab) (Object) blockState.getBlock()).isFullCube())
+            return false;
+
+        return facing == (blockState.getValue(HALF) == TOP ? EnumFacing.DOWN : EnumFacing.UP);
+    }
 }

src/main/java/net/minecraft/block/BlockStairs.java

@@ -28,6 +28,8 @@ import net.minecraft.world.Explosion;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 
+import static net.minecraft.block.BlockStairs.EnumHalf.TOP;
+
 /**+
  * This portion of EaglercraftX contains deobfuscated Minecraft 1.8 source code.
  * 
@@ -704,4 +706,11 @@ public class BlockStairs extends Block {
 			return this.name;
 		}
 	}
+
+	public boolean alfheim$useNeighborBrightness(final IBlockState blockState, final EnumFacing facing, final IBlockAccess blockAccess, final BlockPos blockPos) {
+        if (facing.getAxis() != EnumFacing.Axis.Y)
+            return false;
+
+        return facing == (blockState.getValue(HALF) == TOP ? EnumFacing.DOWN : EnumFacing.UP);
+    }
 }

src/main/java/net/minecraft/block/state/BlockState.java

@@ -21,10 +21,16 @@ import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 
+import net.hoosiertransfer.Alfheim.ILightInfoProvider;
+import net.hoosiertransfer.Alfheim.ILitBlock;
 import net.minecraft.block.Block;
 import net.minecraft.block.properties.IProperty;
+import net.minecraft.util.BlockPos;
 import net.minecraft.util.Cartesian;
+import net.minecraft.util.EnumFacing;
 import net.minecraft.util.MapPopulator;
+import net.minecraft.world.EnumSkyBlock;
+import net.minecraft.world.IBlockAccess;
 
 /**+
  * This portion of EaglercraftX contains deobfuscated Minecraft 1.8 source code.
@@ -46,7 +52,7 @@ import net.minecraft.util.MapPopulator;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public class BlockState {
+public class BlockState implements ILightInfoProvider {
 	private static final Joiner COMMA_JOINER = Joiner.on(", ");
 	private static final Function<IProperty, String> GET_NAME_FUNC = new Function<IProperty, String>() {
 		public String apply(IProperty iproperty) {
@@ -114,7 +120,20 @@ public class BlockState {
 				.add("properties", Iterables.transform(this.properties, GET_NAME_FUNC)).toString();
 	}
 
-	static class StateImplementation extends BlockStateBase {
+	public int alfheim$getLightFor(IBlockAccess iBlockAccess, EnumSkyBlock lightType, BlockPos blockPos) {
+        return ((ILitBlock) block).alfheim$getLightFor(((IBlockState) this), iBlockAccess, lightType, blockPos); // i probably need to cast the StateImplementation to IBlockState instead of this
+    }
+
+
+	public boolean alfheim$useNeighborBrightness(EnumFacing facing, IBlockAccess blockAccess, BlockPos blockPos) {
+        return ((ILitBlock) block).alfheim$useNeighborBrightness(((IBlockState) this), facing, blockAccess, blockPos); // i probably need to cast the StateImplementation to IBlockState instead of this
+    }
+
+	public int alfheim$getLightOpacity(EnumFacing facing, IBlockAccess blockAccess, BlockPos blockPos) {
+        return ((ILitBlock) block).alfheim$getLightOpacity(((IBlockState) this), facing, blockAccess, blockPos); // i probably need to cast the StateImplementation to IBlockState instead of this
+    }
+
+	static class StateImplementation extends BlockStateBase implements ILightInfoProvider {
 		private final Block block;
 		private final ImmutableMap<IProperty, Comparable> properties;
 		private ImmutableTable<IProperty, Comparable, IBlockState> propertyValueTable;
@@ -186,10 +205,26 @@ public class BlockState {
 			}
 		}
 
+		public int getLightValue(IBlockAccess blockAccess, BlockPos pos) {
+			return this.block.getLightValue();
+		}
+
 		private Map<IProperty, Comparable> getPropertiesWithValue(IProperty property, Comparable value) {
 			HashMap hashmap = Maps.newHashMap(this.properties);
 			hashmap.put(property, value);
 			return hashmap;
 		}
+
+		public int alfheim$getLightFor(IBlockAccess iBlockAccess, EnumSkyBlock lightType, BlockPos blockPos) {
+            return ((ILitBlock) block).alfheim$getLightFor(((IBlockState) this), iBlockAccess, lightType, blockPos);
+        }
+
+		public boolean alfheim$useNeighborBrightness(EnumFacing facing, IBlockAccess blockAccess, BlockPos blockPos) {
+            return ((ILitBlock) block).alfheim$useNeighborBrightness(((IBlockState) this), facing, blockAccess, blockPos);
+        }
+
+		public int alfheim$getLightOpacity(EnumFacing facing, IBlockAccess blockAccess, BlockPos blockPos) {
+            return ((ILitBlock) block).alfheim$getLightOpacity(((IBlockState) this), facing, blockAccess, blockPos);
+        }
 	}
 }

src/main/java/net/minecraft/block/state/IBlockState.java

@@ -6,6 +6,8 @@ import com.google.common.collect.ImmutableMap;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.properties.IProperty;
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.IBlockAccess;
 
 /**+
  * This portion of EaglercraftX contains deobfuscated Minecraft 1.8 source code.
@@ -42,4 +44,6 @@ public interface IBlockState {
 	ImmutableMap<IProperty, Comparable> getProperties();
 
 	Block getBlock();
+
+	int getLightValue(IBlockAccess blockAccess, BlockPos pos);
 }

src/main/java/net/minecraft/client/Minecraft.java

@@ -20,6 +20,7 @@ import org.apache.commons.lang3.Validate;
 import com.google.common.collect.Lists;
 
 import net.hoosiertransfer.CullingMod;
+import net.hoosiertransfer.Alfheim.ILightUpdatesProcessor;
 import net.lax1dude.eaglercraft.v1_8.Display;
 import net.lax1dude.eaglercraft.v1_8.EagRuntime;
 import net.lax1dude.eaglercraft.v1_8.EaglerXBungeeVersion;
@@ -328,6 +329,10 @@ public class Minecraft implements IThreadListener {
 		Bootstrap.register();
 	}
 
+	public boolean isCallingFromMinecraftThread() {
+		return Thread.currentThread() == this.mcThread;
+	}
+
 	public void run() {
 		CullingMod.intialize();
 		this.running = true;
@@ -1616,6 +1621,9 @@ public class Minecraft implements IThreadListener {
 			if (!this.isGamePaused) {
 				this.renderGlobal.updateClouds();
 			}
+			this.mcProfiler.endStartSection("processRenderGlobalLightUpdates");
+			if (!isGamePaused)
+            ((ILightUpdatesProcessor) renderGlobal).alfheim$processLightUpdates();
 
 			this.mcProfiler.endStartSection("level");
 			if (!this.isGamePaused) {

src/main/java/net/minecraft/client/multiplayer/ChunkProviderClient.java

@@ -102,6 +102,10 @@ public class ChunkProviderClient implements IChunkProvider {
 		return chunk == null ? this.blankChunk : chunk;
 	}
 
+	public Chunk getLoadedChunk(int var1, int var2) {
+		return (Chunk) this.chunkMapping.getValueByKey(ChunkCoordIntPair.chunkXZ2Int(var1, var2));
+	}
+
 	/**+
 	 * Two modes of operation: if passed true, save all Chunks in
 	 * one go. If passed false, save up to two chunks. Return true

src/main/java/net/minecraft/client/renderer/BlockModelRenderer.java

@@ -3,6 +3,7 @@ package net.minecraft.client.renderer;
 import java.util.BitSet;
 import java.util.List;
 
+import net.hoosiertransfer.Alfheim.util.ClampUtil;
 import net.lax1dude.eaglercraft.v1_8.opengl.GlStateManager;
 import net.lax1dude.eaglercraft.v1_8.opengl.WorldRenderer;
 import net.lax1dude.eaglercraft.v1_8.opengl.ext.deferred.DeferredStateManager;
@@ -53,7 +54,7 @@ public class BlockModelRenderer {
 
 	public boolean renderModel(IBlockAccess blockAccessIn, IBakedModel modelIn, IBlockState blockStateIn,
 			BlockPos blockPosIn, WorldRenderer worldRendererIn, boolean checkSides) {
-		boolean flag = Minecraft.isAmbientOcclusionEnabled() && blockStateIn.getBlock().getLightValue() == 0
+		boolean flag = Minecraft.isAmbientOcclusionEnabled() && ClampUtil.clampMinFirst(blockStateIn.getLightValue(blockAccessIn, blockPosIn) -1, 0, 15) == 0
 				&& modelIn.isAmbientOcclusion();
 
 		try {

src/main/java/net/minecraft/client/renderer/RenderGlobal.java

@@ -8,6 +8,8 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+
+import net.hoosiertransfer.Alfheim.ILightUpdatesProcessor;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 import net.lax1dude.eaglercraft.v1_8.HString;
 import net.lax1dude.eaglercraft.v1_8.Keyboard;
@@ -115,7 +117,7 @@ import net.minecraft.world.chunk.Chunk;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListener {
+public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListener, ILightUpdatesProcessor {
 	private static final Logger logger = LogManager.getLogger();
 	private static final ResourceLocation locationMoonPhasesPng = new ResourceLocation(
 			"textures/environment/moon_phases.png");
@@ -182,6 +184,8 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 	private double prevRenderSortZ;
 	private boolean displayListEntitiesDirty = true;
 
+	private final Set<BlockPos> setLightUpdates = Sets.<BlockPos>newHashSet();
+
 	public RenderGlobal(Minecraft mcIn) {
 		this.mc = mcIn;
 		this.renderManager = mcIn.getRenderManager();
@@ -2108,6 +2112,7 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 	}
 
 	public void notifyLightSet(BlockPos blockpos) {
+		this.setLightUpdates.add(blockpos.toImmutable());
 		int i = blockpos.getX();
 		int j = blockpos.getY();
 		int k = blockpos.getZ();
@@ -2514,4 +2519,33 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 		return "" + Minecraft.getDebugFPS() + "fps | C: " + j + "/" + i + ", E: " + this.countEntitiesRendered + "+" + k
 				+ ", " + renderDispatcher.getDebugInfo();
 	}
+
+	public void alfheim$processLightUpdates() {
+        if (setLightUpdates.isEmpty())
+            return;
+
+        final Iterator<BlockPos> iterator = setLightUpdates.iterator();
+        final float lightUpdateLimit = 2048 + ((float) setLightUpdates.size() / 4); // Todo: Rework this once again, this is currently pretty dumb.
+                                                                                    //       It fixed the issue where the FPS on lower end hardware would plummet for a few seconds.
+                                                                                    //       But it also reduced how smooth the frame rate was on higher end hardware.
+                                                                                    //       Updating blocks is costly and will take a long time, this is why lower end hardware plummets for a few seconds.
+                                                                                    //       Higher end hardware instead has somewhat of a FPS "buffer" which can handle it fine over multiple frames thus reducing frame-time spikes.
+                                                                                    //       The technically the best way to do this (that I hadn't though of before) was to add current "FPS" to the equation.
+                                                                                    //       If the FPS is low more updates would be done in one frame if it is high we can afford spreading light updates over multiple frames.
+
+        short lightUpdatesProcessed = 0;
+        while (iterator.hasNext() && lightUpdatesProcessed < lightUpdateLimit) {
+            final BlockPos blockpos = iterator.next();
+
+            iterator.remove();
+
+            final int x = blockpos.getX();
+            final int y = blockpos.getY();
+            final int z = blockpos.getZ();
+
+            markBlocksForUpdate(x, y, z, x, y, z);
+
+            lightUpdatesProcessed++;
+        }
+    }
 }

src/main/java/net/minecraft/client/settings/GameSettings.java

@@ -207,7 +207,7 @@ public class GameSettings {
 
 	public boolean enableSound = true;
 
-	public boolean disableAlpha = true;
+	public boolean disableAlpha = false;
 
 	public boolean skipHandRender = false;
 

src/main/java/net/minecraft/network/play/server/S21PacketChunkData.java

@@ -5,6 +5,7 @@ import java.util.ArrayList;
 
 import com.google.common.collect.Lists;
 
+import net.hoosiertransfer.Alfheim.ILightingEngineProvider;
 import net.minecraft.network.Packet;
 import net.minecraft.network.PacketBuffer;
 import net.minecraft.network.play.INetHandlerPlayClient;
@@ -44,6 +45,7 @@ public class S21PacketChunkData implements Packet<INetHandlerPlayClient> {
 		this.chunkX = chunkIn.xPosition;
 		this.chunkZ = chunkIn.zPosition;
 		this.field_149279_g = parFlag;
+		chunkIn.alfheim$getLightingEngine().processLightUpdates();
 		this.extractedData = func_179756_a(chunkIn, parFlag, !chunkIn.getWorld().provider.getHasNoSky(), parInt1);
 	}
 

src/main/java/net/minecraft/util/BlockPos.java

@@ -1,8 +1,10 @@
 package net.minecraft.util;
 
 import java.util.Iterator;
+import java.util.List;
 
 import com.google.common.collect.AbstractIterator;
+import com.google.common.collect.Lists;
 
 import net.minecraft.entity.Entity;
 
@@ -317,6 +319,11 @@ public class BlockPos extends Vec3i {
 		return new BlockPos(i, j, k);
 	}
 
+	public BlockPos toImmutable()
+    {
+        return this;
+    }
+
 	/**+
 	 * Create an Iterable that returns all positions in the box
 	 * specified by the given corners
@@ -409,7 +416,7 @@ public class BlockPos extends Vec3i {
 		};
 	}
 
-	public static final class MutableBlockPos extends BlockPos {
+	public static class MutableBlockPos extends BlockPos {
 
 		public MutableBlockPos() {
 			this(0, 0, 0);
@@ -431,6 +438,36 @@ public class BlockPos extends Vec3i {
 			return this.z;
 		}
 
+		public BlockPos.MutableBlockPos setPos(Entity entityIn)
+        {
+            return this.setPos(entityIn.posX, entityIn.posY, entityIn.posZ);
+        }
+
+        public BlockPos.MutableBlockPos setPos(double xIn, double yIn, double zIn)
+        {
+            return this.setPos(MathHelper.floor_double(xIn), MathHelper.floor_double(yIn), MathHelper.floor_double(zIn));
+        }
+
+        public BlockPos.MutableBlockPos setPos(Vec3i vec)
+        {
+            return this.setPos(vec.getX(), vec.getY(), vec.getZ());
+        }
+
+		public BlockPos.MutableBlockPos move(EnumFacing facing)
+        {
+            return this.move(facing, 1);
+        }
+
+        public BlockPos.MutableBlockPos move(EnumFacing facing, int p_189534_2_)
+        {
+            return this.setPos(this.x + facing.getFrontOffsetX() * p_189534_2_, this.y + facing.getFrontOffsetY() * p_189534_2_, this.z + facing.getFrontOffsetZ() * p_189534_2_);
+        }
+
+        public void setY(int yIn)
+        {
+            this.y = yIn;
+        }
+
 		public BlockPos.MutableBlockPos setPos(int x_, int y_, int z_) {
 			this.x = x_;
 			this.y = y_;
@@ -444,5 +481,104 @@ public class BlockPos extends Vec3i {
 			this.z = parInt3;
 			return this;
 		}
+
+		public BlockPos toImmutable()
+        {
+            return new BlockPos(this);
+        }
 	}
+
+	public static final class PooledMutableBlockPos extends BlockPos.MutableBlockPos
+    {
+        private boolean released;
+        private static final List<BlockPos.PooledMutableBlockPos> POOL = Lists.<BlockPos.PooledMutableBlockPos>newArrayList();
+
+        private PooledMutableBlockPos(int xIn, int yIn, int zIn)
+        {
+            super(xIn, yIn, zIn);
+        }
+
+        public static BlockPos.PooledMutableBlockPos retain()
+        {
+            return retain(0, 0, 0);
+        }
+
+        public static BlockPos.PooledMutableBlockPos retain(double xIn, double yIn, double zIn)
+        {
+            return retain(MathHelper.floor_double(xIn), MathHelper.floor_double(yIn), MathHelper.floor_double(zIn));
+        }
+
+        public static BlockPos.PooledMutableBlockPos retain(Vec3i vec)
+        {
+            return retain(vec.getX(), vec.getY(), vec.getZ());
+        }
+
+        public static BlockPos.PooledMutableBlockPos retain(int xIn, int yIn, int zIn)
+        {
+            synchronized (POOL)
+            {
+                if (!POOL.isEmpty())
+                {
+                    BlockPos.PooledMutableBlockPos blockpos$pooledmutableblockpos = (BlockPos.PooledMutableBlockPos)POOL.remove(POOL.size() - 1);
+
+                    if (blockpos$pooledmutableblockpos != null && blockpos$pooledmutableblockpos.released)
+                    {
+                        blockpos$pooledmutableblockpos.released = false;
+                        blockpos$pooledmutableblockpos.setPos(xIn, yIn, zIn);
+                        return blockpos$pooledmutableblockpos;
+                    }
+                }
+            }
+
+            return new BlockPos.PooledMutableBlockPos(xIn, yIn, zIn);
+        }
+
+        public void release()
+        {
+            synchronized (POOL)
+            {
+                if (POOL.size() < 100)
+                {
+                    POOL.add(this);
+                }
+
+                this.released = true;
+            }
+        }
+
+        public BlockPos.PooledMutableBlockPos setPos(int xIn, int yIn, int zIn)
+        {
+            if (this.released)
+            {
+                this.released = false;
+            }
+
+            return (BlockPos.PooledMutableBlockPos)super.setPos(xIn, yIn, zIn);
+        }
+
+        public BlockPos.PooledMutableBlockPos setPos(Entity entityIn)
+        {
+            return (BlockPos.PooledMutableBlockPos)super.setPos(entityIn);
+        }
+
+        public BlockPos.PooledMutableBlockPos setPos(double xIn, double yIn, double zIn)
+        {
+            return (BlockPos.PooledMutableBlockPos)super.setPos(xIn, yIn, zIn);
+        }
+
+        public BlockPos.PooledMutableBlockPos setPos(Vec3i vec)
+        {
+            return (BlockPos.PooledMutableBlockPos)super.setPos(vec);
+        }
+
+        public BlockPos.PooledMutableBlockPos move(EnumFacing facing)
+        {
+            return (BlockPos.PooledMutableBlockPos)super.move(facing);
+        }
+
+        public BlockPos.PooledMutableBlockPos move(EnumFacing facing, int p_189534_2_)
+        {
+            return (BlockPos.PooledMutableBlockPos)super.move(facing, p_189534_2_);
+        }
+    }
 }

src/main/java/net/minecraft/util/EnumFacing.java

@@ -52,7 +52,7 @@ public enum EnumFacing implements IStringSerializable {
 	/**+
 	 * All Facings with horizontal axis in order S-W-N-E
 	 */
-	private static final EnumFacing[] HORIZONTALS = new EnumFacing[4];
+	public static final EnumFacing[] HORIZONTALS = new EnumFacing[4];
 	private static final Map<String, EnumFacing> NAME_LOOKUP = Maps.newHashMap();
 
 	private EnumFacing(int indexIn, int oppositeIn, int horizontalIndexIn, String nameIn,
@@ -208,6 +208,18 @@ public enum EnumFacing implements IStringSerializable {
 		}
 	}
 
+	public int getXOffset() {
+		return this.directionVec.getX();
+	}
+
+	public int getYOffset() {
+		return this.directionVec.getY();
+	}
+
+	public int getZOffset() {
+		return this.directionVec.getZ();
+	}
+
 	/**+
 	 * Returns a offset that addresses the block in front of this
 	 * facing.

src/main/java/net/minecraft/world/ChunkCache.java

@@ -1,5 +1,7 @@
 package net.minecraft.world;
 
+import net.hoosiertransfer.Alfheim.ILightInfoProvider;
+import net.hoosiertransfer.Alfheim.ILightLevelProvider;
 import net.minecraft.block.material.Material;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.init.Blocks;
@@ -29,7 +31,7 @@ import net.minecraft.world.chunk.Chunk;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public class ChunkCache implements IBlockAccess {
+public class ChunkCache implements IBlockAccess, ILightLevelProvider {
 	protected int chunkX;
 	protected int chunkZ;
 	protected Chunk[][] chunkArray;
@@ -105,34 +107,35 @@ public class ChunkCache implements IBlockAccess {
 	}
 
 	private int getLightForExt(EnumSkyBlock pos, BlockPos parBlockPos) {
-		if (pos == EnumSkyBlock.SKY && this.worldObj.provider.getHasNoSky()) {
+		return ((ILightInfoProvider) getBlockState(parBlockPos)).alfheim$getLightFor(((ChunkCache) (Object) this), pos, parBlockPos);
-			return Chunk.getNoSkyLightValue();
+		// if (pos == EnumSkyBlock.SKY && this.worldObj.provider.getHasNoSky()) {
-		} else if (parBlockPos.getY() >= 0 && parBlockPos.getY() < 256) {
+		// 	return Chunk.getNoSkyLightValue();
-			if (this.getBlockState(parBlockPos).getBlock().getUseNeighborBrightness()) {
+		// } else if (parBlockPos.getY() >= 0 && parBlockPos.getY() < 256) {
-				int l = 0;
+		// 	if (this.getBlockState(parBlockPos).getBlock().getUseNeighborBrightness()) {
+		// 		int l = 0;
 
-				EnumFacing[] facings = EnumFacing._VALUES;
+		// 		EnumFacing[] facings = EnumFacing._VALUES;
-				BlockPos tmp = new BlockPos(0, 0, 0);
+		// 		BlockPos tmp = new BlockPos(0, 0, 0);
-				for (int i = 0; i < facings.length; ++i) {
+		// 		for (int i = 0; i < facings.length; ++i) {
-					int k = this.getLightFor(pos, parBlockPos.offsetEvenFaster(facings[i], tmp));
+		// 			int k = this.getLightFor(pos, parBlockPos.offsetEvenFaster(facings[i], tmp));
-					if (k > l) {
+		// 			if (k > l) {
-						l = k;
+		// 				l = k;
-					}
+		// 			}
 
-					if (l >= 15) {
+		// 			if (l >= 15) {
-						return l;
+		// 				return l;
-					}
+		// 			}
-				}
+		// 		}
 
-				return l;
+		// 		return l;
-			} else {
+		// 	} else {
-				int i = (parBlockPos.getX() >> 4) - this.chunkX;
+		// 		int i = (parBlockPos.getX() >> 4) - this.chunkX;
-				int j = (parBlockPos.getZ() >> 4) - this.chunkZ;
+		// 		int j = (parBlockPos.getZ() >> 4) - this.chunkZ;
-				return this.chunkArray[i][j].getLightFor(pos, parBlockPos);
+		// 		return this.chunkArray[i][j].getLightFor(pos, parBlockPos);
-			}
+		// 	}
-		} else {
+		// } else {
-			return pos.defaultLightValue;
+		// 	return pos.defaultLightValue;
-		}
+		// }
 	}
 
 	/**+
@@ -163,4 +166,8 @@ public class ChunkCache implements IBlockAccess {
 	public WorldType getWorldType() {
 		return this.worldObj.getWorldType();
 	}
+
+	public int alfheim$getLight(final EnumSkyBlock lightType, final BlockPos blockPos) {
+        return getLightFor(lightType, blockPos);
+    }
 }

src/main/java/net/minecraft/world/World.java

@@ -10,6 +10,10 @@ import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 
+import net.hoosiertransfer.Alfheim.ILightInfoProvider;
+import net.hoosiertransfer.Alfheim.ILightLevelProvider;
+import net.hoosiertransfer.Alfheim.ILightingEngineProvider;
+import net.hoosiertransfer.Alfheim.lighting.LightingEngine;
 import net.lax1dude.eaglercraft.v1_8.EagRuntime;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 import java.util.Set;
@@ -80,7 +84,7 @@ import net.minecraft.world.storage.WorldInfo;
  * POSSIBILITY OF SUCH DAMAGE.
  * 
  */
-public abstract class World implements IBlockAccess {
+public abstract class World implements IBlockAccess, ILightingEngineProvider, ILightLevelProvider {
 	private int field_181546_a = 63;
 	protected boolean scheduledUpdatesAreImmediate;
 	/**+
@@ -150,6 +154,8 @@ public abstract class World implements IBlockAccess {
 	int[] lightUpdateBlockList;
 	public final boolean isRemote;
 
+	private LightingEngine alfheim$lightingEngine;
+
 	protected World(ISaveHandler saveHandlerIn, WorldInfo info, WorldProvider providerIn, Profiler profilerIn,
 			boolean client) {
 		this.ambientTickCountdown = this.rand.nextInt(12000);
@@ -162,6 +168,8 @@ public abstract class World implements IBlockAccess {
 		this.provider = providerIn;
 		this.worldBorder = providerIn.getWorldBorder();
 		this.isRemote = client;
+
+		alfheim$lightingEngine = new LightingEngine((World) (Object) this);
 	}
 
 	public World init() {
@@ -529,43 +537,12 @@ public abstract class World implements IBlockAccess {
 	}
 
 	public int getLight(BlockPos pos, boolean checkNeighbors) {
-		if (pos.getX() >= -30000000 && pos.getZ() >= -30000000 && pos.getX() < 30000000 && pos.getZ() < 30000000) {
+		if (!checkNeighbors)
-			if (checkNeighbors && this.getBlockState(pos).getBlock().getUseNeighborBrightness()) {
+			return getLight(pos);
-				int i1 = this.getLight(pos.up(), false);
-				int i = this.getLight(pos.east(), false);
-				int j = this.getLight(pos.west(), false);
-				int k = this.getLight(pos.south(), false);
-				int l = this.getLight(pos.north(), false);
-				if (i > i1) {
-					i1 = i;
-				}
 
-				if (j > i1) {
+		final IBlockState blockState = getBlockState(pos);
-					i1 = j;
-				}
 
-				if (k > i1) {
+		return Math.max(((ILightInfoProvider) blockState).alfheim$getLightFor(((World) (Object) this), EnumSkyBlock.BLOCK, pos), ((ILightInfoProvider) blockState).alfheim$getLightFor(((World) (Object) this), EnumSkyBlock.SKY, pos) - skylightSubtracted);
-					i1 = k;
-				}
-
-				if (l > i1) {
-					i1 = l;
-				}
-
-				return i1;
-			} else if (pos.getY() < 0) {
-				return 0;
-			} else {
-				if (pos.getY() >= 256) {
-					pos = new BlockPos(pos.getX(), 255, pos.getZ());
-				}
-
-				Chunk chunk = this.getChunkFromBlockCoords(pos);
-				return chunk.getLightSubtracted(pos, this.skylightSubtracted);
-			}
-		} else {
-			return 15;
-		}
 	}
 
 	/**+
@@ -605,45 +582,7 @@ public abstract class World implements IBlockAccess {
 	}
 
 	public int getLightFromNeighborsFor(EnumSkyBlock type, BlockPos pos) {
-		if (this.provider.getHasNoSky() && type == EnumSkyBlock.SKY) {
+		return ((ILightInfoProvider) getBlockState(pos)).alfheim$getLightFor(((World) (Object) this), type, pos);
-			return Chunk.getNoSkyLightValue();
-		} else {
-			if (pos.getY() < 0) {
-				pos = new BlockPos(pos.getX(), 0, pos.getZ());
-			}
-
-			if (!this.isValid(pos)) {
-				return type.defaultLightValue;
-			} else if (!this.isBlockLoaded(pos)) {
-				return type.defaultLightValue;
-			} else if (this.getBlockState(pos).getBlock().getUseNeighborBrightness()) {
-				int i1 = this.getLightFor(type, pos.up());
-				int i = this.getLightFor(type, pos.east());
-				int j = this.getLightFor(type, pos.west());
-				int k = this.getLightFor(type, pos.south());
-				int l = this.getLightFor(type, pos.north());
-				if (i > i1) {
-					i1 = i;
-				}
-
-				if (j > i1) {
-					i1 = j;
-				}
-
-				if (k > i1) {
-					i1 = k;
-				}
-
-				if (l > i1) {
-					i1 = l;
-				}
-
-				return i1;
-			} else {
-				Chunk chunk = this.getChunkFromBlockCoords(pos);
-				return chunk.getLightFor(type, pos);
-			}
-		}
 	}
 
 	public int getLightFor(EnumSkyBlock type, BlockPos pos) {
@@ -2325,118 +2264,9 @@ public abstract class World implements IBlockAccess {
 	}
 
 	public boolean checkLightFor(EnumSkyBlock lightType, BlockPos pos) {
-		if (!this.isAreaLoaded(pos, 17, false)) {
+		alfheim$lightingEngine.scheduleLightUpdate(lightType, pos);
-			return false;
-		} else {
-			int i = 0;
-			int j = 0;
-			this.theProfiler.startSection("getBrightness");
-			int k = this.getLightFor(lightType, pos);
-			int l = this.getRawLight(pos, lightType);
-			int i1 = pos.getX();
-			int j1 = pos.getY();
-			int k1 = pos.getZ();
-			if (l > k) {
-				this.lightUpdateBlockList[j++] = 133152;
-			} else if (l < k) {
-				this.lightUpdateBlockList[j++] = 133152 | k << 18;
 
-				while (i < j) {
+		return true;
-					int l1 = this.lightUpdateBlockList[i++];
-					int i2 = (l1 & 63) - 32 + i1;
-					int j2 = (l1 >> 6 & 63) - 32 + j1;
-					int k2 = (l1 >> 12 & 63) - 32 + k1;
-					int l2 = l1 >> 18 & 15;
-					BlockPos blockpos = new BlockPos(i2, j2, k2);
-					int i3 = this.getLightFor(lightType, blockpos);
-					if (i3 == l2) {
-						this.setLightFor(lightType, blockpos, 0);
-						if (l2 > 0) {
-							int j3 = MathHelper.abs_int(i2 - i1);
-							int k3 = MathHelper.abs_int(j2 - j1);
-							int l3 = MathHelper.abs_int(k2 - k1);
-							if (j3 + k3 + l3 < 17) {
-								BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos();
-
-								EnumFacing[] facings = EnumFacing._VALUES;
-								for (int m = 0; m < facings.length; ++m) {
-									EnumFacing enumfacing = facings[m];
-									int i4 = i2 + enumfacing.getFrontOffsetX();
-									int j4 = j2 + enumfacing.getFrontOffsetY();
-									int k4 = k2 + enumfacing.getFrontOffsetZ();
-									blockpos$mutableblockpos.func_181079_c(i4, j4, k4);
-									int l4 = Math.max(1,
-											this.getBlockState(blockpos$mutableblockpos).getBlock().getLightOpacity());
-									i3 = this.getLightFor(lightType, blockpos$mutableblockpos);
-									if (i3 == l2 - l4 && j < this.lightUpdateBlockList.length) {
-										this.lightUpdateBlockList[j++] = i4 - i1 + 32 | j4 - j1 + 32 << 6
-												| k4 - k1 + 32 << 12 | l2 - l4 << 18;
-									}
-								}
-							}
-						}
-					}
-				}
-
-				i = 0;
-			}
-
-			this.theProfiler.endSection();
-			this.theProfiler.startSection("checkedPosition < toCheckCount");
-
-			while (i < j) {
-				int i5 = this.lightUpdateBlockList[i++];
-				int j5 = (i5 & 63) - 32 + i1;
-				int k5 = (i5 >> 6 & 63) - 32 + j1;
-				int l5 = (i5 >> 12 & 63) - 32 + k1;
-				BlockPos blockpos1 = new BlockPos(j5, k5, l5);
-				int i6 = this.getLightFor(lightType, blockpos1);
-				int j6 = this.getRawLight(blockpos1, lightType);
-				if (j6 != i6) {
-					this.setLightFor(lightType, blockpos1, j6);
-					if (j6 > i6) {
-						int k6 = Math.abs(j5 - i1);
-						int l6 = Math.abs(k5 - j1);
-						int i7 = Math.abs(l5 - k1);
-						boolean flag = j < this.lightUpdateBlockList.length - 6;
-						if (k6 + l6 + i7 < 17 && flag) {
-							if (this.getLightFor(lightType, blockpos1.west()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 - 1 - i1 + 32 + (k5 - j1 + 32 << 6)
-										+ (l5 - k1 + 32 << 12);
-							}
-
-							if (this.getLightFor(lightType, blockpos1.east()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 + 1 - i1 + 32 + (k5 - j1 + 32 << 6)
-										+ (l5 - k1 + 32 << 12);
-							}
-
-							if (this.getLightFor(lightType, blockpos1.down()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 - i1 + 32 + (k5 - 1 - j1 + 32 << 6)
-										+ (l5 - k1 + 32 << 12);
-							}
-
-							if (this.getLightFor(lightType, blockpos1.up()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 - i1 + 32 + (k5 + 1 - j1 + 32 << 6)
-										+ (l5 - k1 + 32 << 12);
-							}
-
-							if (this.getLightFor(lightType, blockpos1.north()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 - i1 + 32 + (k5 - j1 + 32 << 6)
-										+ (l5 - 1 - k1 + 32 << 12);
-							}
-
-							if (this.getLightFor(lightType, blockpos1.south()) < j6) {
-								this.lightUpdateBlockList[j++] = j5 - i1 + 32 + (k5 - j1 + 32 << 6)
-										+ (l5 + 1 - k1 + 32 << 12);
-							}
-						}
-					}
-				}
-			}
-
-			this.theProfiler.endSection();
-			return true;
-		}
 	}
 
 	/**+
@@ -3210,4 +3040,12 @@ public abstract class World implements IBlockAccess {
 		short short1 = 128;
 		return i >= -short1 && i <= short1 && j >= -short1 && j <= short1;
 	}
+
+	public LightingEngine alfheim$getLightingEngine() {
+        return alfheim$lightingEngine;
+    }
+
+	public int alfheim$getLight(final EnumSkyBlock lightType, final BlockPos blockPos) {
+        return getLightFor(lightType, blockPos);
+    }
 }

src/main/java/net/minecraft/world/chunk/Chunk.java

@@ -6,6 +6,13 @@ import java.util.Arrays;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+
+import net.hoosiertransfer.Alfheim.IChunkLightingData;
+import net.hoosiertransfer.Alfheim.ILightingEngineProvider;
+import net.hoosiertransfer.Alfheim.lighting.LightUtil;
+import net.hoosiertransfer.Alfheim.lighting.LightingEngine;
+import net.hoosiertransfer.Alfheim.util.EnumBoundaryFacing;
+import net.hoosiertransfer.Alfheim.util.WorldChunkSlice;
 import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
 
 import java.util.concurrent.Callable;
@@ -81,6 +88,15 @@ public class Chunk {
 	private int queuedLightChecks;
 	private List<BlockPos> tileEntityPosQueue;
 
+	public static final ExtendedBlockStorage NULL_BLOCK_STORAGE = null;
+
+	private LightingEngine alfheim$lightingEngine;
+	private boolean alfheim$isLightInitialized;
+	private short[] alfheim$neighborLightChecks;
+	private static final EnumSkyBlock[] ENUM_SKY_BLOCK_VALUES = EnumSkyBlock.values();
+	private static final EnumFacing[] ENUM_FACING_HORIZONTAL = EnumFacing.Plane.HORIZONTAL.facings();
+	private static final EnumFacing.AxisDirection[] ENUM_AXIS_DIRECTION_VALUES = EnumFacing.AxisDirection.values();
+
 	public Chunk(World worldIn, int x, int z) {
 		this.storageArrays = new ExtendedBlockStorage[16];
 		this.blockBiomeArray = new byte[256];
@@ -101,6 +117,8 @@ public class Chunk {
 
 		Arrays.fill(this.precipitationHeightMap, -999);
 		Arrays.fill(this.blockBiomeArray, (byte) -1);
+
+		alfheim$lightingEngine = worldIn.alfheim$getLightingEngine();
 	}
 
 	public Chunk(World worldIn, ChunkPrimer primer, int x, int z) {
@@ -231,8 +249,10 @@ public class Chunk {
 							ExtendedBlockStorage extendedblockstorage = this.storageArrays[i1 >> 4];
 							if (extendedblockstorage != null) {
 								extendedblockstorage.setExtSkylightValue(j, i1 & 15, k, k1);
-								this.worldObj.notifyLightSet(
+								alfheim$initSkylightForSection(storageArrays[i1 >> 4]);
-										new BlockPos((this.xPosition << 4) + j, i1, (this.zPosition << 4) + k));
+								// do i comment this out?
+								// this.worldObj.notifyLightSet(
+								// 		new BlockPos((this.xPosition << 4) + j, i1, (this.zPosition << 4) + k));
 							}
 						}
 
@@ -261,44 +281,22 @@ public class Chunk {
 	}
 
 	private void recheckGaps(boolean parFlag) {
-		this.worldObj.theProfiler.startSection("recheckGaps");
+		if (!worldObj.isAreaLoaded(new BlockPos((xPosition << 4) + 8, 0, (zPosition << 4) + 8), 16))
-		if (this.worldObj.isAreaLoaded(new BlockPos(this.xPosition * 16 + 8, 0, this.zPosition * 16 + 8), 16)) {
+            return;
-			for (int i = 0; i < 16; ++i) {
-				for (int j = 0; j < 16; ++j) {
-					if (this.updateSkylightColumns[i + j * 16]) {
-						this.updateSkylightColumns[i + j * 16] = false;
-						int k = this.getHeightValue(i, j);
-						int l = this.xPosition * 16 + i;
-						int i1 = this.zPosition * 16 + j;
-						int j1 = Integer.MAX_VALUE;
 
-						EnumFacing[] facings = EnumFacing.Plane.HORIZONTAL.facingsArray;
+		final WorldChunkSlice slice = new WorldChunkSlice(worldObj.getChunkProvider(), xPosition, zPosition);
-						for (int m = 0; m < facings.length; ++m) {
-							EnumFacing enumfacing = facings[m];
-							j1 = Math.min(j1, this.worldObj.getChunksLowestHorizon(l + enumfacing.getFrontOffsetX(),
-									i1 + enumfacing.getFrontOffsetZ()));
-						}
 
-						this.checkSkylightNeighborHeight(l, i1, j1);
+		for (int x = 0; x < 16; ++x) {
+            for (int z = 0; z < 16; ++z) {
+                if (!alfheim$recheckGapsForColumn(slice, x, z))
+                    continue;
 
-						for (int m = 0; m < facings.length; ++m) {
+                if (parFlag)
-							EnumFacing enumfacing1 = facings[m];
+                    return;
-							this.checkSkylightNeighborHeight(l + enumfacing1.getFrontOffsetX(),
+            }
-									i1 + enumfacing1.getFrontOffsetZ(), k);
+        }
-						}
 
-						if (parFlag) {
+		isGapLightingUpdated = false;
-							this.worldObj.theProfiler.endSection();
-							return;
-						}
-					}
-				}
-			}
-
-			this.isGapLightingUpdated = false;
-		}
-
-		this.worldObj.theProfiler.endSection();
 	}
 
 	/**+
@@ -331,91 +329,24 @@ public class Chunk {
 	 * sky-light for a given block inside a chunk.
 	 */
 	private void relightBlock(int x, int y, int z) {
-		int i = this.heightMap[z << 4 | x] & 255;
+		int heightMapY = heightMap[z << 4 | x] & 255;
-		int j = i;
+        int newHeightMapY = Math.max(y, heightMapY);
-		if (y > i) {
-			j = y;
-		}
 
-		while (j > 0 && this.getBlockLightOpacity(x, j - 1, z) == 0) {
+        while (newHeightMapY > 0 && getBlockLightOpacity(x, newHeightMapY - 1, z) == 0)
-			--j;
+            --newHeightMapY;
-		}
 
-		if (j != i) {
+        if (newHeightMapY == heightMapY)
-			this.worldObj.markBlocksDirtyVertical(x + this.xPosition * 16, z + this.zPosition * 16, j, i);
+            return;
-			this.heightMap[z << 4 | x] = j;
-			int k = this.xPosition * 16 + x;
-			int l = this.zPosition * 16 + z;
-			if (!this.worldObj.provider.getHasNoSky()) {
-				if (j < i) {
-					for (int j1 = j; j1 < i; ++j1) {
-						ExtendedBlockStorage extendedblockstorage2 = this.storageArrays[j1 >> 4];
-						if (extendedblockstorage2 != null) {
-							extendedblockstorage2.setExtSkylightValue(x, j1 & 15, z, 15);
-							this.worldObj.notifyLightSet(
-									new BlockPos((this.xPosition << 4) + x, j1, (this.zPosition << 4) + z));
-						}
-					}
-				} else {
-					for (int i1 = i; i1 < j; ++i1) {
-						ExtendedBlockStorage extendedblockstorage = this.storageArrays[i1 >> 4];
-						if (extendedblockstorage != null) {
-							extendedblockstorage.setExtSkylightValue(x, i1 & 15, z, 0);
-							this.worldObj.notifyLightSet(
-									new BlockPos((this.xPosition << 4) + x, i1, (this.zPosition << 4) + z));
-						}
-					}
-				}
 
-				int k1 = 15;
+        heightMap[z << 4 | x] = newHeightMapY;
 
-				while (j > 0 && k1 > 0) {
+        if (!worldObj.provider.getHasNoSky())
-					--j;
+            alfheim$relightSkylightColumn(x, z, heightMapY, newHeightMapY);
-					int i2 = this.getBlockLightOpacity(x, j, z);
-					if (i2 == 0) {
-						i2 = 1;
-					}
 
-					k1 -= i2;
+        final int heightMapY1 = heightMap[z << 4 | x];
-					if (k1 < 0) {
-						k1 = 0;
-					}
 
-					ExtendedBlockStorage extendedblockstorage1 = this.storageArrays[j >> 4];
+        if (heightMapY1 < heightMapMinimum)
-					if (extendedblockstorage1 != null) {
+            heightMapMinimum = heightMapY1;
-						extendedblockstorage1.setExtSkylightValue(x, j & 15, z, k1);
-					}
-				}
-			}
-
-			int l1 = this.heightMap[z << 4 | x];
-			int j2 = i;
-			int k2 = l1;
-			if (l1 < i) {
-				j2 = l1;
-				k2 = i;
-			}
-
-			if (l1 < this.heightMapMinimum) {
-				this.heightMapMinimum = l1;
-			}
-
-			if (!this.worldObj.provider.getHasNoSky()) {
-				EnumFacing[] facings = EnumFacing.Plane.HORIZONTAL.facingsArray;
-				for (int m = 0; m < facings.length; ++m) {
-					EnumFacing enumfacing = facings[m];
-					this.updateSkylightNeighborHeight(k + enumfacing.getFrontOffsetX(),
-							l + enumfacing.getFrontOffsetZ(), j2, k2);
-				}
-
-				this.updateSkylightNeighborHeight(k, l, j2, k2);
-			}
-
-			if (!this.worldObj.isRemote) {
-				++EaglerMinecraftServer.counterLightUpdate;
-			}
-			this.isModified = true;
-		}
 	}
 
 	public int getBlockLightOpacity(BlockPos blockpos) {
@@ -577,7 +508,9 @@ public class Chunk {
 
 				extendedblockstorage = this.storageArrays[j >> 4] = new ExtendedBlockStorage(j >> 4 << 4,
 						!this.worldObj.provider.getHasNoSky());
-				flag = j >= i1;
+
+				alfheim$initSkylightForSection(extendedblockstorage);
+				// flag = j >= i1;
 			}
 
 			extendedblockstorage.set(i, j & 15, k, state);
@@ -605,10 +538,10 @@ public class Chunk {
 						this.relightBlock(i, j, k);
 					}
 
-					if (j1 != k1 && (j1 < k1 || this.getLightFor(EnumSkyBlock.SKY, pos) > 0
+					// if (j1 != k1 && (j1 < k1 || this.getLightFor(EnumSkyBlock.SKY, pos) > 0
-							|| this.getLightFor(EnumSkyBlock.BLOCK, pos) > 0)) {
+					// 		|| this.getLightFor(EnumSkyBlock.BLOCK, pos) > 0)) {
-						this.propagateSkylightOcclusion(i, k);
+					// 	this.propagateSkylightOcclusion(i, k);
-					}
+					// }
 				}
 
 				if (block1 instanceof ITileEntityProvider) {
@@ -642,17 +575,9 @@ public class Chunk {
 	}
 
 	public int getLightFor(EnumSkyBlock enumskyblock, BlockPos blockpos) {
-		int i = blockpos.getX() & 15;
+		alfheim$lightingEngine.processLightUpdatesForType(enumskyblock);
-		int j = blockpos.getY();
+
-		int k = blockpos.getZ() & 15;
+        return alfheim$getCachedLightFor(enumskyblock, blockpos);
-		ExtendedBlockStorage extendedblockstorage = this.storageArrays[j >> 4];
-		return extendedblockstorage == null
-				? (this.canSeeSky(blockpos) ? enumskyblock.defaultLightValue : getNoSkyLightValue())
-				: (enumskyblock == EnumSkyBlock.SKY
-						? (this.worldObj.provider.getHasNoSky() ? getNoSkyLightValue()
-								: extendedblockstorage.getExtSkylightValue(i, j & 15, k))
-						: (enumskyblock == EnumSkyBlock.BLOCK ? extendedblockstorage.getExtBlocklightValue(i, j & 15, k)
-								: enumskyblock.defaultLightValue));
 	}
 
 	public void setLightFor(EnumSkyBlock enumskyblock, BlockPos blockpos, int i) {
@@ -678,6 +603,7 @@ public class Chunk {
 	}
 
 	public int getLightSubtracted(BlockPos blockpos, int i) {
+		alfheim$lightingEngine.processLightUpdates();	
 		int j = blockpos.getX() & 15;
 		int k = blockpos.getY();
 		int l = blockpos.getZ() & 15;
@@ -830,6 +756,33 @@ public class Chunk {
 			this.worldObj.loadEntities(this.entityLists[i]);
 		}
 
+		final Chunk chunk = (Chunk) (Object) this;
+
+		for (final EnumFacing facing : EnumFacing.HORIZONTALS) {
+            final int xOffset = facing.getXOffset();
+            final int zOffset = facing.getZOffset();
+
+            final Chunk nChunk = worldObj.getChunkProvider().getLoadedChunk(chunk.xPosition + xOffset, chunk.zPosition + zOffset);
+
+            if (nChunk == null)
+                continue;
+
+            for (final EnumSkyBlock lightType : ENUM_SKY_BLOCK_VALUES) {
+                for (final EnumFacing.AxisDirection axisDir : ENUM_AXIS_DIRECTION_VALUES) {
+                    // Merge flags upon loading of a chunk. This ensures that all flags are always already on the IN boundary below
+                    alfheim$mergeFlags(lightType, chunk, nChunk, facing, axisDir);
+                    alfheim$mergeFlags(lightType, nChunk, chunk, facing.getOpposite(), axisDir);
+
+                    // Check everything that might have been canceled due to this chunk not being loaded.
+                    // Also, pass in chunks if already known
+                    // The boundary to the neighbor chunk (both ways)
+                    alfheim$scheduleRelightChecksForBoundary(chunk, nChunk, null, lightType, xOffset, zOffset, axisDir);
+                    alfheim$scheduleRelightChecksForBoundary(nChunk, chunk, null, lightType, -xOffset, -zOffset, axisDir);
+                    // The boundary to the diagonal neighbor (since the checks in that chunk were aborted if this chunk wasn't loaded, see alfheim$scheduleRelightChecksForBoundary)
+                    alfheim$scheduleRelightChecksForBoundary(nChunk, null, chunk, lightType, (zOffset != 0 ? axisDir.getOffset() : 0), (xOffset != 0 ? axisDir.getOffset() : 0), facing.getAxisDirection() == EnumFacing.AxisDirection.POSITIVE ? EnumFacing.AxisDirection.NEGATIVE : EnumFacing.AxisDirection.POSITIVE);
+                }
+            }
+        }
 	}
 
 	/**+
@@ -1014,7 +967,7 @@ public class Chunk {
 
 		this.field_150815_m = true;
 		if (!this.isLightPopulated && this.isTerrainPopulated) {
-			this.func_150809_p();
+			this.checkLight();
 		}
 
 		while (!this.tileEntityPosQueue.isEmpty()) {
@@ -1225,38 +1178,27 @@ public class Chunk {
 
 	}
 
-	public void func_150809_p() {
+	public void checkLight() {
 		this.isTerrainPopulated = true;
-		this.isLightPopulated = true;
-		BlockPos blockpos = new BlockPos(this.xPosition << 4, 0, this.zPosition << 4);
-		if (!this.worldObj.provider.getHasNoSky()) {
-			if (this.worldObj.isAreaLoaded(blockpos.add(-1, 0, -1),
-					blockpos.add(16, this.worldObj.func_181545_F(), 16))) {
-				label92: for (int i = 0; i < 16; ++i) {
-					for (int j = 0; j < 16; ++j) {
-						if (!this.func_150811_f(i, j)) {
-							this.isLightPopulated = false;
-							break label92;
-						}
-					}
-				}
 
-				if (this.isLightPopulated) {
+		final Chunk chunk = (Chunk) (Object) this;
-					EnumFacing[] facings = EnumFacing.Plane.HORIZONTAL.facingsArray;
-					for (int i = 0; i < facings.length; ++i) {
-						EnumFacing enumfacing = facings[i];
-						int k = enumfacing.getAxisDirection() == EnumFacing.AxisDirection.POSITIVE ? 16 : 1;
-						this.worldObj.getChunkFromBlockCoords(blockpos.offset(enumfacing, k))
-								.func_180700_a(enumfacing.getOpposite());
-					}
 		
-					this.func_177441_y();
+		if (!chunk.alfheim$isLightInitialized())
-				}
+            alfheim$initChunkLighting(chunk, worldObj);
-			} else {
+
-				this.isLightPopulated = false;
+		for (int x = -1; x <= 1; x++) {
+			for (int z = -1; z <= 1; z++) {
+				if (x == 0 && z == 0)
+					continue;
+
+				final Chunk nChunk = worldObj.getChunkProvider().getLoadedChunk(chunk.xPosition + x, chunk.zPosition + z);
+
+				if (nChunk == null || !nChunk.alfheim$isLightInitialized())
+					return;
 			}
 		}
 
+		chunk.setLightPopulated(true);
 	}
 
 	private void func_177441_y() {
@@ -1400,4 +1342,309 @@ public class Chunk {
 	public static enum EnumCreateEntityType {
 		IMMEDIATE, QUEUED, CHECK;
 	}
+
+	private boolean alfheim$recheckGapsForColumn(final WorldChunkSlice slice, final int x, final int z) {
+        final int i = x + z * 16;
+
+        if (updateSkylightColumns[i]) {
+            updateSkylightColumns[i] = false;
+
+            final int x1 = this.xPosition * 16 + x;
+            final int z1 = this.zPosition * 16 + z;
+
+            alfheim$recheckGapsSkylightNeighborHeight(slice, x1, z1, getHeightValue(x, z), alfheim$recheckGapsGetLowestHeight(slice, x1, z1));
+
+            return true;
+        }
+
+        return false;
+    }
+
+	private int alfheim$recheckGapsGetLowestHeight(final WorldChunkSlice slice, final int x, final int z) {
+        int max = Integer.MAX_VALUE;
+
+        for (final EnumFacing facing : ENUM_FACING_HORIZONTAL) {
+            final Chunk chunk = slice.getChunkFromWorldCoords(x + facing.getXOffset(), z + facing.getZOffset());
+
+            if (chunk != null)
+                max = Math.min(max, chunk.getLowestHeight());
+        }
+
+        return max;
+    }
+
+	private void alfheim$recheckGapsSkylightNeighborHeight(final WorldChunkSlice slice, final int x, final int z, final int height, final int max) {
+        alfheim$checkSkylightNeighborHeight(slice, x, z, max);
+
+        for (final EnumFacing facing : ENUM_FACING_HORIZONTAL)
+            alfheim$checkSkylightNeighborHeight(slice, x + facing.getXOffset(), z + facing.getFrontOffsetZ(), height);
+    }
+
+	private void alfheim$checkSkylightNeighborHeight(final WorldChunkSlice slice, final int x, final int z, final int maxValue) {
+        if (slice.getChunkFromWorldCoords(x, z) == null)
+            return;
+
+        final int y = slice.getChunkFromWorldCoords(x, z).getHeightValue(x & 15, z & 15);
+
+        if (y > maxValue)
+            alfheim$updateSkylightNeighborHeight(slice, x, z, maxValue, y + 1);
+        else if (y < maxValue)
+            alfheim$updateSkylightNeighborHeight(slice, x, z, y, maxValue + 1);
+    }
+
+	private void alfheim$updateSkylightNeighborHeight(final WorldChunkSlice slice, final int x, final int z, final int startY, final int endY) {
+        if (endY < startY)
+            return;
+
+        if (!slice.isLoaded(x, z, 16))
+            return;
+
+        for (int y = startY; y < endY; ++y)
+            worldObj.checkLightFor(EnumSkyBlock.SKY, new BlockPos(x, y, z));
+
+		isModified = true;
+    }
+
+	private static void alfheim$mergeFlags(final EnumSkyBlock lightType, final Chunk inChunk, final Chunk outChunk, final EnumFacing dir, final EnumFacing.AxisDirection axisDirection) {
+        // final IChunkLightingData outChunkLightingData = (IChunkLightingData) outChunk; // I REALLY NEED TO SUBMIT A BUG REPORT FOR THIS WEIRD PROBLEM WHERE FUNCTIONS GET DELETED IF YOU DO THIS IN TEAVM
+
+        if (outChunk.alfheim$getNeighborLightChecks() == null)
+            return;
+
+        inChunk.alfheim$initNeighborLightChecks();
+
+        final int inIndex = alfheim$getFlagIndex(lightType, dir, axisDirection, EnumBoundaryFacing.IN);
+        final int outIndex = alfheim$getFlagIndex(lightType, dir.getOpposite(), axisDirection, EnumBoundaryFacing.OUT);
+
+        inChunk.alfheim$getNeighborLightChecks()[inIndex] |= outChunk.alfheim$getNeighborLightChecks()[outIndex];
+        // No need to call Chunk.setModified() since checks are not deleted from outChunk
+    }
+
+	private void alfheim$scheduleRelightChecksForBoundary(final Chunk chunk, Chunk nChunk, Chunk sChunk, final EnumSkyBlock lightType, final int xOffset, final int zOffset, final EnumFacing.AxisDirection axisDirection) {
+        if (chunk.alfheim$getNeighborLightChecks() == null)
+            return;
+
+        final int flagIndex = alfheim$getFlagIndex(lightType, xOffset, zOffset, axisDirection, EnumBoundaryFacing.IN); // OUT checks from neighbor are already merged
+
+        final int flags = chunk.alfheim$getNeighborLightChecks()[flagIndex];
+
+        if (flags == 0)
+            return;
+
+        if (nChunk == null) {
+            nChunk = worldObj.getChunkProvider().getLoadedChunk(chunk.xPosition + xOffset, chunk.zPosition + zOffset);
+
+            if (nChunk == null)
+                return;
+        }
+
+        if (sChunk == null) {
+            sChunk = worldObj.getChunkProvider()
+                    .getLoadedChunk(chunk.xPosition + (zOffset != 0 ? axisDirection.getOffset() : 0), chunk.zPosition + (xOffset != 0 ? axisDirection.getOffset() : 0));
+
+            if (sChunk == null)
+                return; // Cancel, since the checks in the corner columns require the corner column of sChunk
+        }
+
+        final int reverseIndex = alfheim$getFlagIndex(lightType, -xOffset, -zOffset, axisDirection, EnumBoundaryFacing.OUT);
+
+        chunk.alfheim$getNeighborLightChecks()[flagIndex] = 0;
+
+        if (nChunk.alfheim$getNeighborLightChecks() != null)
+		nChunk.alfheim$getNeighborLightChecks()[reverseIndex] = 0; // Clear only now that it's clear that the checks are processed
+
+        chunk.setChunkModified();
+        nChunk.setChunkModified();
+
+        // Get the area to check
+        // Start in the corner...
+        int xMin = chunk.xPosition << 4;
+        int zMin = chunk.zPosition << 4;
+
+        // Move to other side of chunk if the direction is positive
+        if ((xOffset | zOffset) > 0) {
+            xMin += 15 * xOffset;
+            zMin += 15 * zOffset;
+        }
+
+        // Shift to other half if necessary (shift perpendicular to dir)
+        if (axisDirection == EnumFacing.AxisDirection.POSITIVE) {
+            xMin += 8 * (zOffset & 1); //x & 1 is same as abs(x) for x=-1,0,1
+            zMin += 8 * (xOffset & 1);
+        }
+
+        // Get maximal values (shift perpendicular to dir)
+        final int xMax = xMin + 7 * (zOffset & 1);
+        final int zMax = zMin + 7 * (xOffset & 1);
+
+        for (int y = 0; y < 16; ++y)
+            if ((flags & (1 << y)) != 0)
+                for (int x = xMin; x <= xMax; ++x)
+                    for (int z = zMin; z <= zMax; ++z)
+                        alfheim$scheduleRelightChecksForColumn(lightType, x, z, y << 4, (y << 4) + 15);
+    }
+
+	private void alfheim$initSkylightForSection(final ExtendedBlockStorage extendedBlockStorage) {
+        if (worldObj.provider.getHasNoSky())
+            return;
+
+        for (int x = 0; x < 16; ++x) {
+            for (int z = 0; z < 16; ++z) {
+                if (((Chunk) (Object) this).getHeightValue(x, z) > extendedBlockStorage.getYLocation())
+                    continue;
+
+                for (int y = 0; y < 16; ++y)
+                    extendedBlockStorage.setExtSkylightValue(x, y, z, EnumSkyBlock.SKY.defaultLightValue);
+            }
+        }
+    }
+
+	private void alfheim$scheduleRelightChecksForColumn(final EnumSkyBlock lightType, final int x, final int z, final int yMin, final int yMax) {
+        final BlockPos.MutableBlockPos mutableBlockPos = new BlockPos.MutableBlockPos();
+
+        for (int y = yMin; y <= yMax; ++y)
+            worldObj.checkLightFor(lightType, mutableBlockPos.setPos(x, y, z));
+    }
+
+	private static int alfheim$getFlagIndex(final EnumSkyBlock lightType, final int xOffset, final int zOffset, final EnumFacing.AxisDirection axisDirection, final EnumBoundaryFacing boundaryFacing) {
+        return (lightType == EnumSkyBlock.BLOCK ? 0 : 16) | ((xOffset + 1) << 2) | ((zOffset + 1) << 1) | (axisDirection.getOffset() + 1) | boundaryFacing.ordinal();
+    }
+
+	private static int alfheim$getFlagIndex(final EnumSkyBlock lightType, final EnumFacing facing, final EnumFacing.AxisDirection axisDirection, final EnumBoundaryFacing boundaryFacing) {
+        return alfheim$getFlagIndex(lightType, facing.getXOffset(), facing.getZOffset(), axisDirection, boundaryFacing);
+    }
+
+	private static void alfheim$initChunkLighting(final Chunk chunk, final World world) {
+        final int xBase = chunk.xPosition << 4;
+        final int zBase = chunk.zPosition << 4;
+
+        final BlockPos.PooledMutableBlockPos mutableBlockPos = BlockPos.PooledMutableBlockPos.retain(xBase, 0, zBase);
+
+        if (world.isAreaLoaded(mutableBlockPos.add(-16, 0, -16), mutableBlockPos.add(31, 255, 31), false)) {
+            final ExtendedBlockStorage[] extendedBlockStorage = chunk.getBlockStorageArray();
+
+            for (int i = 0; i < extendedBlockStorage.length; ++i) {
+                final ExtendedBlockStorage storage = extendedBlockStorage[i];
+
+                if (storage == Chunk.NULL_BLOCK_STORAGE)
+                    continue;
+
+                int yBase = i * 16;
+
+                for (int y = 0; y < 16; y++) {
+                    for (int z = 0; z < 16; z++) {
+                        for (int x = 0; x < 16; x++) {
+                            mutableBlockPos.setPos(xBase + x, yBase + y, zBase + z);
+
+                            if (LightUtil.getLightValueForState(storage.get(x, y, z), world, mutableBlockPos) > 0)
+                                world.checkLightFor(EnumSkyBlock.BLOCK, mutableBlockPos);
+                        }
+                    }
+                }
+            }
+
+            if (!world.provider.getHasNoSky())
+                chunk.alfheim$setSkylightUpdatedPublic();
+
+            chunk.alfheim$setLightInitialized(true);
+        }
+
+        mutableBlockPos.release();
+    }
+	
+	private void alfheim$relightSkylightColumn(final int x, final int z, final int height1, final int height2) {
+        final int yMin = Math.min(height1, height2);
+        final int yMax = Math.max(height1, height2) - 1;
+
+        final Chunk chunk = ((Chunk) (Object) this);
+
+        final ExtendedBlockStorage[] sections = chunk.getBlockStorageArray();
+
+        final int xBase = (chunk.xPosition << 4) + x;
+        final int zBase = (chunk.zPosition << 4) + z;
+
+        alfheim$scheduleRelightChecksForColumn(EnumSkyBlock.SKY, xBase, zBase, yMin, yMax);
+
+        if (sections[yMin >> 4] == Chunk.NULL_BLOCK_STORAGE && yMin > 0) {
+            worldObj.checkLightFor(EnumSkyBlock.SKY, new BlockPos(xBase, yMin - 1, zBase));
+        }
+
+        short emptySections = 0;
+
+        for (int sec = yMax >> 4; sec >= yMin >> 4; --sec) {
+            if (sections[sec] == Chunk.NULL_BLOCK_STORAGE) {
+                emptySections |= (short) (1 << sec);
+            }
+        }
+
+        if (emptySections != 0) {
+            for (final EnumFacing facing : EnumFacing.HORIZONTALS) {
+                final int xOffset = facing.getXOffset();
+                final int zOffset = facing.getZOffset();
+
+                final boolean neighborColumnExists =
+                        (((x + xOffset) | (z + zOffset)) & 16) == 0
+                                //Checks whether the position is at the specified border (the 16 bit is set for both 15+1 and 0-1)
+                                || worldObj.getChunkProvider().getLoadedChunk(chunk.xPosition + xOffset, chunk.zPosition + zOffset) != null;
+
+                if (neighborColumnExists) {
+                    for (int sec = yMax >> 4; sec >= yMin >> 4; --sec) {
+                        if ((emptySections & (1 << sec)) != 0)
+                            alfheim$scheduleRelightChecksForColumn(EnumSkyBlock.SKY, xBase + xOffset, zBase + zOffset, sec << 4, (sec << 4) + 15);
+                    }
+                } else {
+                    chunk.alfheim$initNeighborLightChecks();
+
+                    final EnumFacing.AxisDirection axisDirection = ((facing.getAxis() == EnumFacing.Axis.X ? z : x) & 15) < 8 ? EnumFacing.AxisDirection.NEGATIVE : EnumFacing.AxisDirection.POSITIVE;
+                    chunk.alfheim$getNeighborLightChecks()[alfheim$getFlagIndex(EnumSkyBlock.SKY, facing, axisDirection, EnumBoundaryFacing.OUT)] |= emptySections;
+
+                    chunk.setChunkModified();
+                }
+            }
+        }
+    }
+
+	public short[] alfheim$getNeighborLightChecks() {
+        return alfheim$neighborLightChecks;
+    }
+
+	public void alfheim$setNeighborLightChecks(final short[] data) {
+        alfheim$neighborLightChecks = data;
+    }
+	
+	public LightingEngine alfheim$getLightingEngine() {
+        return alfheim$lightingEngine;
+    }
+
+	public boolean alfheim$isLightInitialized() {
+        return alfheim$isLightInitialized;
+    }
+
+	public void alfheim$setLightInitialized(final boolean lightInitialized) {
+        alfheim$isLightInitialized = lightInitialized;
+    }
+
+	public void alfheim$setSkylightUpdatedPublic() {
+        func_177441_y();
+    }
+
+	public void alfheim$initNeighborLightChecks() {
+        if (alfheim$getNeighborLightChecks() == null)
+            alfheim$setNeighborLightChecks(new short[32]);
+    }
+
+	public byte alfheim$getCachedLightFor(final EnumSkyBlock lightType, final BlockPos blockPos) {
+        final int x = blockPos.getX() & 15;
+        final int y = blockPos.getY();
+        final int z = blockPos.getZ() & 15;
+
+        final ExtendedBlockStorage extendedblockstorage = storageArrays[y >> 4];
+
+        if (extendedblockstorage == Chunk.NULL_BLOCK_STORAGE)
+            return canSeeSky(blockPos) ? (byte) lightType.defaultLightValue : 0;
+        else if (lightType == EnumSkyBlock.SKY)
+            return !worldObj.provider.getHasNoSky() ? (byte) extendedblockstorage.getExtSkylightValue(x, y & 15, z) : 0;
+        else
+            return lightType == EnumSkyBlock.BLOCK ? (byte) extendedblockstorage.getExtBlocklightValue(x, y & 15, z) : (byte) lightType.defaultLightValue;
+    }
 }

src/main/java/net/minecraft/world/chunk/IChunkProvider.java

@@ -41,6 +41,8 @@ public interface IChunkProvider {
 	 */
 	Chunk provideChunk(int var1, int var2);
 
+	Chunk getLoadedChunk(int var1, int var2);
+
 	/**+
 	 * Will return back a chunk, if it doesn't exist and its not a
 	 * MP client it will generates all the blocks for the specified

src/main/java/net/minecraft/world/chunk/storage/AnvilChunkLoader.java

@@ -6,6 +6,7 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityList;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
+import net.minecraft.nbt.NBTTagShort;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.BlockPos;
 import net.minecraft.util.ResourceLocation;
@@ -13,6 +14,7 @@ import net.minecraft.world.NextTickListEntry;
 import net.minecraft.world.World;
 import net.minecraft.world.chunk.Chunk;
 import net.minecraft.world.chunk.NibbleArray;
+import net.hoosiertransfer.Alfheim.IChunkLightingData;
 import net.lax1dude.eaglercraft.v1_8.log4j.LogManager;
 import net.lax1dude.eaglercraft.v1_8.log4j.Logger;
 
@@ -38,6 +40,7 @@ import net.lax1dude.eaglercraft.v1_8.log4j.Logger;
  */
 public abstract class AnvilChunkLoader implements IChunkLoader {
 	private static final Logger logger = LogManager.getLogger("AnvilChunkLoader");
+	private static final String NEIGHBOR_LIGHT_CHECKS_KEY = "NeighborLightChecks";
 
 	/**+
 	 * Wraps readChunkFromNBT. Checks the coordinates and several
@@ -73,6 +76,9 @@ public abstract class AnvilChunkLoader implements IChunkLoader {
 	 * last update time.
 	 */
 	protected void writeChunkToNBT(Chunk chunkIn, World worldIn, NBTTagCompound parNBTTagCompound) {
+		alfheim$writeNeighborLightChecksToNBT(chunkIn, parNBTTagCompound);
+		parNBTTagCompound.setBoolean("LightPopulated", chunkIn.alfheim$isLightInitialized());
+
 		parNBTTagCompound.setByte("V", (byte) 1);
 		parNBTTagCompound.setInteger("xPos", chunkIn.xPosition);
 		parNBTTagCompound.setInteger("zPos", chunkIn.zPosition);
@@ -285,6 +291,48 @@ public abstract class AnvilChunkLoader implements IChunkLoader {
 			}
 		}
 
+		alfheim$readNeighborLightChecksFromNBT(chunk, parNBTTagCompound);
+
+		chunk.alfheim$setLightInitialized(parNBTTagCompound.getBoolean("LightPopulated"));
 		return chunk;
 	}
+
+	private static void alfheim$readNeighborLightChecksFromNBT(final Chunk chunk, final NBTTagCompound compound) {
+        if (!compound.hasKey(NEIGHBOR_LIGHT_CHECKS_KEY, 9))
+            return;
+
+        final NBTTagList tagList = compound.getTagList(NEIGHBOR_LIGHT_CHECKS_KEY, 2);
+
+        if (tagList.tagCount() != 32) {
+            return;
+        }
+
+        chunk.alfheim$initNeighborLightChecks();
+
+        final short[] neighborLightChecks = chunk.alfheim$getNeighborLightChecks();
+
+        for (int i = 0; i < 32; ++i)
+            neighborLightChecks[i] = ((NBTTagShort) tagList.get(i)).getShort();
+    }
+
+	private static void alfheim$writeNeighborLightChecksToNBT(final Chunk chunk, final NBTTagCompound compound) {
+        final short[] neighborLightChecks = chunk.alfheim$getNeighborLightChecks();
+
+        if (neighborLightChecks == null)
+            return;
+
+        boolean empty = true;
+
+        final NBTTagList list = new NBTTagList();
+
+        for (final short flags : neighborLightChecks) {
+            list.appendTag(new NBTTagShort(flags));
+
+            if (flags != 0)
+                empty = false;
+        }
+
+        if (!empty)
+            compound.setTag(NEIGHBOR_LIGHT_CHECKS_KEY, list);
+    }
 }

src/main/java/net/minecraft/world/gen/ChunkProviderDebug.java

@@ -45,6 +45,8 @@ public class ChunkProviderDebug implements IChunkProvider {
 		this.world = worldIn;
 	}
 
+	
+
 	/**+
 	 * Will return back a chunk, if it doesn't exist and its not a
 	 * MP client it will generates all the blocks for the specified
@@ -79,6 +81,10 @@ public class ChunkProviderDebug implements IChunkProvider {
 		return chunk;
 	}
 
+	public Chunk getLoadedChunk(int parInt1, int parInt2) {
+		return this.provideChunk(parInt1, parInt2);
+	}
+
 	public static IBlockState func_177461_b(int parInt1, int parInt2) {
 		IBlockState iblockstate = null;
 		if (parInt1 > 0 && parInt2 > 0 && parInt1 % 2 != 0 && parInt2 % 2 != 0) {

src/main/java/net/minecraft/world/gen/ChunkProviderEnd.java

@@ -181,6 +181,10 @@ public class ChunkProviderEnd implements IChunkProvider {
 		return chunk;
 	}
 
+	public Chunk getLoadedChunk(int parInt1, int parInt2) {
+		return this.provideChunk(parInt1, parInt2);
+	}
+
 	/**+
 	 * generates a subset of the level's terrain data. Takes 7
 	 * arguments: the [empty] noise array, the position, and the

src/main/java/net/minecraft/world/gen/ChunkProviderFlat.java

@@ -157,6 +157,10 @@ public class ChunkProviderFlat implements IChunkProvider {
 		return chunk;
 	}
 
+	public Chunk getLoadedChunk(int var1, int var2) {
+		return this.provideChunk(var1, var2);
+	}
+
 	/**+
 	 * Checks to see if a chunk exists at x, z
 	 */

src/main/java/net/minecraft/world/gen/ChunkProviderGenerate.java

@@ -247,6 +247,10 @@ public class ChunkProviderGenerate implements IChunkProvider {
 		return chunk;
 	}
 
+	public Chunk getLoadedChunk(int var1, int var2) {
+		return this.provideChunk(var1, var2);
+	}
+
 	private void func_147423_a(int parInt1, int parInt2, int parInt3) {
 		this.field_147426_g = this.noiseGen6.generateNoiseOctaves(this.field_147426_g, parInt1, parInt3, 5, 5,
 				(double) this.settings.depthNoiseScaleX, (double) this.settings.depthNoiseScaleZ,

src/main/java/net/minecraft/world/gen/ChunkProviderHell.java

@@ -264,6 +264,10 @@ public class ChunkProviderHell implements IChunkProvider {
 		return chunk;
 	}
 
+	public Chunk getLoadedChunk(int i, int j) {
+		return this.provideChunk(i, j);
+	}
+
 	/**+
 	 * generates a subset of the level's terrain data. Takes 7
 	 * arguments: the [empty] noise array, the position, and the

src/main/java/net/minecraft/world/gen/ChunkProviderServer.java

@@ -24,6 +24,7 @@ import net.minecraft.world.chunk.Chunk;
 import net.minecraft.world.chunk.EmptyChunk;
 import net.minecraft.world.chunk.IChunkProvider;
 import net.minecraft.world.chunk.storage.IChunkLoader;
+import net.hoosiertransfer.Alfheim.ILightingEngineProvider;
 import net.lax1dude.eaglercraft.v1_8.HString;
 import net.lax1dude.eaglercraft.v1_8.log4j.LogManager;
 import net.lax1dude.eaglercraft.v1_8.log4j.Logger;
@@ -157,6 +158,10 @@ public class ChunkProviderServer implements IChunkProvider {
 				: this.loadChunk(i, j)) : chunk;
 	}
 
+	public Chunk getLoadedChunk(int i, int j) {
+		return (Chunk) this.id2ChunkMap.getValueByKey(ChunkCoordIntPair.chunkXZ2Int(i, j));
+	}
+
 	private Chunk loadChunkFromFile(int x, int z) {
 		if (this.chunkLoader == null) {
 			return null;
@@ -211,7 +216,7 @@ public class ChunkProviderServer implements IChunkProvider {
 	public void populate(IChunkProvider ichunkprovider, int i, int j) {
 		Chunk chunk = this.provideChunk(i, j);
 		if (!chunk.isTerrainPopulated()) {
-			chunk.func_150809_p();
+			chunk.checkLight();
 			if (this.serverChunkGenerator != null) {
 				this.serverChunkGenerator.populate(ichunkprovider, i, j);
 				chunk.setChunkModified();
@@ -236,6 +241,7 @@ public class ChunkProviderServer implements IChunkProvider {
 	 * if all chunks have been saved.
 	 */
 	public boolean saveChunks(boolean flag, IProgressUpdate var2) {
+		worldObj.alfheim$getLightingEngine().processLightUpdates();
 		int i = 0;
 		ArrayList arraylist = Lists.newArrayList(this.loadedChunks);
 
@@ -278,6 +284,7 @@ public class ChunkProviderServer implements IChunkProvider {
 		if (!this.worldObj.disableLevelSaving) {
 			for (int i = 0; i < 100; ++i) {
 				if (!this.droppedChunksSet.isEmpty()) {
+					//!!! i probably should do a ((ILightingEngineProvider) world).alfheim$getLightingEngine().processLightUpdates(); here
 					Long olong = (Long) this.droppedChunksSet.iterator().next();
 					Chunk chunk = (Chunk) this.id2ChunkMap.getValueByKey(olong.longValue());
 					if (chunk != null) {