From ff141325520b2a64ed66c1e224df6b5e07096025 Mon Sep 17 00:00:00 2001
From: Iceee <andrew@opticgaming.tv>
Date: Wed, 23 Jul 2014 09:42:45 -0500
Subject: [PATCH] Better water lighting updates


diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 406aead..d284614 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -42,6 +42,12 @@ public class Chunk {
     private int x;
     protected net.minecraft.util.gnu.trove.map.hash.TObjectIntHashMap<Class> entityCount = new net.minecraft.util.gnu.trove.map.hash.TObjectIntHashMap<Class>(); // Spigot
 
+    // PaperSpigot start
+    private boolean waterLightingChanged;
+    private boolean[] waterChanges;
+    private int ticks;
+    // PaperSpigot end
+
     // CraftBukkit start - Neighbor loaded cache for chunk lighting and entity ticking
     private int neighbors = 0x1 << 12;
 
@@ -75,6 +81,9 @@ public class Chunk {
         this.v = new byte[256];
         this.b = new int[256];
         this.c = new boolean[256];
+        // PaperSpigot start
+        this.waterChanges = new boolean[256];
+        // PaperSpigot end
         this.tileEntities = new HashMap();
         this.x = 4096;
         this.entitySlices = new List[16];
@@ -231,6 +240,14 @@ public class Chunk {
         this.n = true;
     }
 
+    // PaperSpigot start
+    private void scheduleWaterLightingUpdate(int i, int j) {
+        this.waterChanges[i + j * 16] = true;
+        this.waterLightingChanged = true;
+    }
+
+    // PaperSpigot end
+
     private void e(int i, int j) {
         this.c[i + j * 16] = true;
         this.w = true;
@@ -241,8 +258,11 @@ public class Chunk {
         if (this.world.areChunksLoaded(this.locX * 16 + 8, 0, this.locZ * 16 + 8, 16)) {
             for (int i = 0; i < 16; ++i) {
                 for (int j = 0; j < 16; ++j) {
-                    if (this.c[i + j * 16]) {
+                    // PaperSpigot start
+                    if (this.c[i + j * 16] || this.waterChanges[i + j * 16]) {
                         this.c[i + j * 16] = false;
+                        this.waterChanges[i + j * 16] = false;
+                        // PaperSpigot end
                         int k = this.b(i, j);
                         int l = this.locX * 16 + i;
                         int i1 = this.locZ * 16 + j;
@@ -277,6 +297,9 @@ public class Chunk {
             }
 
             this.w = false;
+            // PaperSpigot start
+            this.waterLightingChanged = false;
+            // PaperSpigot end
         }
 
         this.world.methodProfiler.b();
@@ -507,7 +530,13 @@ public class Chunk {
                     }
 
                     if (j2 != k2 && (j2 < k2 || this.getBrightness(EnumSkyBlock.SKY, i, j, k) > 0 || this.getBrightness(EnumSkyBlock.BLOCK, i, j, k) > 0)) {
-                        this.e(i, k);
+                        // PaperSpigot start
+                        if(block.material == Material.WATER) {
+                            this.scheduleWaterLightingUpdate(i, k);
+                        } else {
+                            this.e(i, k);
+                        }
+                        // PaperSpigot end
                     }
                 }
 
@@ -961,9 +990,14 @@ public class Chunk {
     }
 
     public void b(boolean flag) {
-        if (this.w && !this.world.worldProvider.g && !flag) {
+        // PaperSpigot start
+        ++ticks;
+        if(ticks % 20 == 0 && this.waterLightingChanged) {
+            this.c(this.world.isStatic);
+        } else if (this.w && !this.world.worldProvider.g && !flag) {
             this.c(this.world.isStatic);
         }
+        // PaperSpigot end
 
         this.m = true;
         if (!this.lit && this.done && this.world.spigotConfig.randomLightUpdates) { // Spigot - also use random light updates setting to determine if we should relight
-- 
1.9.4.msysgit.0