From 1a6b7d184ae33b78e376ca6ca464f8054c30f3d0 Mon Sep 17 00:00:00 2001
From: Leijurv <leijurv@gmail.com>
Date: Sun, 23 Sep 2018 10:20:19 -0700
Subject: [PATCH] cache chunk load check through block state interface

---
 .../pathing/calc/AStarPathFinder.java         | 16 +++----------
 .../baritone/utils/BlockStateInterface.java   | 23 +++++++++++++++++++
 2 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/src/main/java/baritone/pathing/calc/AStarPathFinder.java b/src/main/java/baritone/pathing/calc/AStarPathFinder.java
index 37378397c..d733931f3 100644
--- a/src/main/java/baritone/pathing/calc/AStarPathFinder.java
+++ b/src/main/java/baritone/pathing/calc/AStarPathFinder.java
@@ -18,8 +18,6 @@
 package baritone.pathing.calc;
 
 import baritone.Baritone;
-import baritone.cache.CachedWorld;
-import baritone.cache.WorldProvider;
 import baritone.pathing.calc.openset.BinaryHeapOpenSet;
 import baritone.pathing.goals.Goal;
 import baritone.pathing.movement.ActionCosts;
@@ -27,8 +25,6 @@ import baritone.pathing.movement.CalculationContext;
 import baritone.pathing.path.IPath;
 import baritone.utils.BlockStateInterface;
 import baritone.utils.Helper;
-import net.minecraft.client.Minecraft;
-import net.minecraft.client.multiplayer.ChunkProviderClient;
 import net.minecraft.util.math.BlockPos;
 
 import java.util.HashSet;
@@ -64,8 +60,6 @@ public final class AStarPathFinder extends AbstractNodeCostSearch implements Hel
         }
         CalculationContext calcContext = new CalculationContext();
         HashSet<Long> favored = favoredPositions.orElse(null);
-        CachedWorld cachedWorld = Optional.ofNullable(WorldProvider.INSTANCE.getCurrentWorld()).map(w -> w.cache).orElse(null);
-        ChunkProviderClient chunkProvider = Minecraft.getMinecraft().world.getChunkProvider();
         BlockStateInterface.clearCachedChunk();
         long startTime = System.nanoTime() / 1000000L;
         boolean slowPath = Baritone.settings().slowPath.get();
@@ -102,12 +96,9 @@ public final class AStarPathFinder extends AbstractNodeCostSearch implements Hel
                 int newZ = currentNode.z + moves.zOffset;
                 if (newX >> 4 != currentNode.x >> 4 || newZ >> 4 != currentNode.z >> 4) {
                     // only need to check if the destination is a loaded chunk if it's in a different chunk than the start of the movement
-                    if (chunkProvider.isChunkGeneratedAt(newX >> 4, newZ >> 4)) { // TODO could also call BlockStateInterface here
-                        // see issue #106
-                        if (cachedWorld == null || !cachedWorld.isCached(newX, newZ)) { // TODO isCached could call BlockStateInterface to skip a hashmap lookup
-                            numEmptyChunk++;
-                            continue;
-                        }
+                    if (!BlockStateInterface.isLoaded(newX, newZ)) {
+                        numEmptyChunk++;
+                        continue;
                     }
                 }
                 MoveResult res = moves.apply(calcContext, currentNode.x, currentNode.y, currentNode.z);
@@ -119,7 +110,6 @@ public final class AStarPathFinder extends AbstractNodeCostSearch implements Hel
                 if (actionCost >= ActionCosts.COST_INF) {
                     continue;
                 }
-
                 if (actionCost <= 0) {
                     throw new IllegalStateException(moves + " calculated implausible cost " + actionCost);
                 }
diff --git a/src/main/java/baritone/utils/BlockStateInterface.java b/src/main/java/baritone/utils/BlockStateInterface.java
index c5d076ea2..fda465f45 100644
--- a/src/main/java/baritone/utils/BlockStateInterface.java
+++ b/src/main/java/baritone/utils/BlockStateInterface.java
@@ -90,6 +90,29 @@ public class BlockStateInterface implements Helper {
         return type;
     }
 
+    public static boolean isLoaded(int x, int z) {
+        Chunk prevChunk = prev;
+        if (prevChunk != null && prevChunk.x == x >> 4 && prevChunk.z == z >> 4) {
+            return true;
+        }
+        if (mc.world.getChunk(x >> 4, z >> 4).isLoaded()) {
+            return true;
+        }
+        CachedRegion prevRegion = prevCached;
+        if (prevRegion != null && prevRegion.getX() == x >> 9 && prevRegion.getZ() == z >> 9) {
+            return prevRegion.isCached(x & 511, z & 511);
+        }
+        WorldData world = WorldProvider.INSTANCE.getCurrentWorld();
+        if (world == null) {
+            return false;
+        }
+        CachedRegion region = world.cache.getRegion(x >> 9, z >> 9);
+        if (region == null) {
+            return false;
+        }
+        return region.isCached(x & 511, z & 511);
+    }
+
     public static void clearCachedChunk() {
         prev = null;
         prevCached = null;