Fix chunk loading at one chunk render distance

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

@@ -190,6 +190,8 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 	private double prevRenderSortZ;
 	boolean displayListEntitiesDirty = true;
 	private RenderEnv renderEnv = new RenderEnv(Blocks.air.getDefaultState(), new BlockPos(0, 0, 0));
+	private int renderDistance = 0;
+    private int renderDistanceSq = 0;
 
 	public RenderGlobal(Minecraft mcIn) {
 		this.mc = mcIn;
@@ -411,6 +413,8 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
             }
 			
 			this.renderDistanceChunks = this.mc.gameSettings.renderDistanceChunks;
+			this.renderDistance = this.renderDistanceChunks * 16;
+            this.renderDistanceSq = this.renderDistance * this.renderDistance;
 
 			if (this.viewFrustum != null) {
 				this.viewFrustum.deleteGlResources();
@@ -1056,20 +1060,21 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 	}
 
 	private RenderChunk func_181562_a(BlockPos p_181562_1_, RenderChunk p_181562_2_, EnumFacing p_181562_3_) {
-        BlockPos blockpos = p_181562_2_.func_181701_a(p_181562_3_);
+		if(this.mc.gameSettings.renderDistanceChunks >= 2) { //Breaks at one chunk render distance...
+			BlockPos blockpos = p_181562_2_.getPositionOffset16(p_181562_3_);
 
 			if (blockpos.getY() >= 0 && blockpos.getY() < 256) {
 				int i = MathHelper.abs_int(p_181562_1_.getX() - blockpos.getX());
 				int j = MathHelper.abs_int(p_181562_1_.getZ() - blockpos.getZ());
 
 				if (Config.isFogOff()) {
-                if (i > this.renderDistanceChunks * 16 || j > this.renderDistanceChunks * 16) {
+					if (i > this.renderDistance || j > this.renderDistance) {
 						return null;
 					}
 				} else {
 					int k = i * i + j * j;
 
-                if (k > ((this.renderDistanceChunks * 16) * (this.renderDistanceChunks * 16))) {
+					if (k > this.renderDistanceSq) {
 						return null;
 					}
 				}
@@ -1078,6 +1083,10 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
 			} else {
 				return null;
 			}
+		} else {
+			BlockPos blockpos = p_181562_2_.getPositionOffset16(p_181562_3_);
+			return MathHelper .abs_int(p_181562_1_.getX() - blockpos.getX()) > this.renderDistanceChunks * 16 ? null : (blockpos.getY() >= 0 && blockpos.getY() < 256 ? (MathHelper.abs_int(p_181562_1_.getZ() - blockpos.getZ()) > this.renderDistanceChunks * 16 ? null : this.viewFrustum.getRenderChunk(blockpos)) : null);
+		}
     }
 
 	private void fixTerrainFrustum(double x, double y, double z) {
@@ -2709,7 +2718,7 @@ public class RenderGlobal implements IWorldAccess, IResourceManagerReloadListene
         if (p_getRenderChunk_1_ == null) {
             return null;
         } else {
-            BlockPos blockpos = p_getRenderChunk_1_.func_181701_a(p_getRenderChunk_2_);
+            BlockPos blockpos = p_getRenderChunk_1_.getPositionOffset16(p_getRenderChunk_2_);
             return this.viewFrustum.getRenderChunk(blockpos);
         }
     }

src/main/java/net/minecraft/client/renderer/chunk/RenderChunk.java

@@ -73,7 +73,7 @@ public class RenderChunk {
 	public ShadowFrustumState shadowLOD0InFrustum = ShadowFrustumState.OUTSIDE;
 	public ShadowFrustumState shadowLOD1InFrustum = ShadowFrustumState.OUTSIDE;
 	public ShadowFrustumState shadowLOD2InFrustum = ShadowFrustumState.OUTSIDE;
-	private EnumMap<EnumFacing, BlockPos> field_181702_p = Maps.newEnumMap(EnumFacing.class);
+	private BlockPos[] positionOffsets16 = new BlockPos[EnumFacing.VALUES.length];
 
 	public RenderChunk(World worldIn, RenderGlobal renderGlobalIn, BlockPos blockPosIn, int indexIn) {
 		this.world = worldIn;
@@ -98,13 +98,11 @@ public class RenderChunk {
 		this.stopCompileTask();
 		this.position = pos;
 		this.boundingBox = new AxisAlignedBB(pos, pos.add(16, 16, 16));
-
-		EnumFacing[] facings = EnumFacing._VALUES;
-		for (int i = 0; i < facings.length; ++i) {
-			this.field_181702_p.put(facings[i], pos.offset(facings[i], 16));
-		}
-
 		this.initModelviewMatrix();
+		
+		for (int i = 0; i < this.positionOffsets16.length; ++i) {
+            this.positionOffsets16[i] = null;
+        }
 	}
 
 	public void resortTransparency(float x, float y, float z, ChunkCompileTaskGenerator generator) {
@@ -321,7 +319,15 @@ public class RenderChunk {
 		return this.needsUpdate;
 	}
 
-	public BlockPos func_181701_a(EnumFacing parEnumFacing) {
+	public BlockPos getPositionOffset16(EnumFacing p_getPositionOffset16_1_) {
-		return (BlockPos) this.field_181702_p.get(parEnumFacing);
+        int i = p_getPositionOffset16_1_.getIndex();
+        BlockPos blockpos = this.positionOffsets16[i];
+
+        if (blockpos == null) {
+            blockpos = this.getPosition().offset(p_getPositionOffset16_1_, 16);
+            this.positionOffsets16[i] = blockpos;
+        }
+
+        return blockpos;
     }
 }

src/main/java/net/minecraft/server/MinecraftServer.java

@@ -585,12 +585,6 @@ public abstract class MinecraftServer implements Runnable, ICommandSender, IThre
 	public void startServerThread() {
 		this.serverThread = new Thread(this, "Server thread");
 		this.serverThread.start();
-		
-		//Lmao ¯\_(ツ)_/¯
-		Thread.currentThread().setPriority(10); 
-		
-		//Possible TPS fix!?!?
-		this.serverThread.setPriority(10);
 	}
 
 	/**+