Create a BlockStateInterface specialized IBlockAccess wrapper

src/main/java/baritone/pathing/movement/MovementHelper.java

@@ -134,7 +134,7 @@ public interface MovementHelper extends ActionCosts, Helper {
             return block == Blocks.WATER || block == Blocks.FLOWING_WATER;
         }
 
-        return block.isPassable(bsi.world, bsi.isPassableBlockPos.setPos(x, y, z));
+        return block.isPassable(bsi.access, bsi.isPassableBlockPos.setPos(x, y, z));
     }
 
     /**
@@ -149,7 +149,7 @@ public interface MovementHelper extends ActionCosts, Helper {
      */
     static boolean fullyPassable(CalculationContext context, int x, int y, int z) {
         return fullyPassable(
-                context.bsi.world,
+                context.bsi.access,
                 context.bsi.isPassableBlockPos.setPos(x, y, z),
                 context.bsi.get0(x, y, z)
         );
@@ -159,7 +159,7 @@ public interface MovementHelper extends ActionCosts, Helper {
         return fullyPassable(ctx.world(), pos, ctx.world().getBlockState(pos));
     }
 
-    static boolean fullyPassable(IBlockAccess world, BlockPos pos, IBlockState state) {
+    static boolean fullyPassable(IBlockAccess access, BlockPos pos, IBlockState state) {
         Block block = state.getBlock();
         if (block == Blocks.AIR) { // early return for most common case
             return true;
@@ -181,7 +181,7 @@ public interface MovementHelper extends ActionCosts, Helper {
             return false;
         }
         // door, fence gate, liquid, trapdoor have been accounted for, nothing else uses the world or pos parameters
-        return block.isPassable(world, pos);
+        return block.isPassable(access, pos);
     }
 
     static boolean isReplaceable(int x, int y, int z, IBlockState state, BlockStateInterface bsi) {

src/main/java/baritone/pathing/movement/movements/MovementParkour.java

@@ -114,7 +114,7 @@ public class MovementParkour extends Movement {
                 return;
             }
             IBlockState destInto = context.bsi.get0(destX, y, destZ);
-            if (!MovementHelper.fullyPassable(context.bsi.world, context.bsi.isPassableBlockPos.setPos(destX, y, destZ), destInto)) {
+            if (!MovementHelper.fullyPassable(context.bsi.access, context.bsi.isPassableBlockPos.setPos(destX, y, destZ), destInto)) {
                 if (i <= 3 && context.allowParkourAscend && context.canSprint && MovementHelper.canWalkOn(context.bsi, destX, y, destZ, destInto) && checkOvershootSafety(context.bsi, destX + xDiff, y + 1, destZ + zDiff)) {
                     res.x = destX;
                     res.y = y + 1;

src/main/java/baritone/utils/BlockStateInterface.java

@@ -43,8 +43,9 @@ public class BlockStateInterface {
 
     private final Long2ObjectMap<Chunk> loadedChunks;
     private final WorldData worldData;
-    public final IBlockAccess world;
+    protected final IBlockAccess world;
     public final BlockPos.MutableBlockPos isPassableBlockPos;
+    public final IBlockAccess access;
 
     private Chunk prev = null;
     private CachedRegion prevCached = null;
@@ -75,6 +76,7 @@ public class BlockStateInterface {
             throw new IllegalStateException();
         }
         this.isPassableBlockPos = new BlockPos.MutableBlockPos();
+        this.access = new BlockStateInterfaceAccessWrapper(this);
     }
 
     public boolean worldContainsLoadedChunk(int blockX, int blockZ) {

src/main/java/baritone/utils/BlockStateInterfaceAccessWrapper.java

@@ -0,0 +1,80 @@
+/*
+ * This file is part of Baritone.
+ *
+ * Baritone is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Baritone is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Baritone.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package baritone.utils;
+
+import net.minecraft.block.material.Material;
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.IBlockAccess;
+import net.minecraft.world.WorldType;
+import net.minecraft.world.biome.Biome;
+
+import javax.annotation.Nullable;
+
+/**
+ * @author Brady
+ * @since 11/5/2019
+ */
+@SuppressWarnings("NullableProblems")
+public final class BlockStateInterfaceAccessWrapper implements IBlockAccess {
+
+    private final BlockStateInterface bsi;
+
+    BlockStateInterfaceAccessWrapper(BlockStateInterface bsi) {
+        this.bsi = bsi;
+    }
+
+    @Nullable
+    @Override
+    public TileEntity getTileEntity(BlockPos pos) {
+        throw new UnsupportedOperationException("getTileEntity not supported by BlockStateInterfaceAccessWrapper");
+    }
+
+    @Override
+    public int getCombinedLight(BlockPos pos, int lightValue) {
+        throw new UnsupportedOperationException("getCombinedLight not supported by BlockStateInterfaceAccessWrapper");
+    }
+
+    @Override
+    public IBlockState getBlockState(BlockPos pos) {
+        // BlockStateInterface#get0(BlockPos) btfo!
+        return this.bsi.get0(pos.getX(), pos.getY(), pos.getZ());
+    }
+
+    @Override
+    public boolean isAirBlock(BlockPos pos) {
+        return this.bsi.get0(pos.getX(), pos.getY(), pos.getZ()).getMaterial() == Material.AIR;
+    }
+
+    @Override
+    public Biome getBiome(BlockPos pos) {
+        throw new UnsupportedOperationException("getBiome not supported by BlockStateInterfaceAccessWrapper");
+    }
+
+    @Override
+    public int getStrongPower(BlockPos pos, EnumFacing direction) {
+        throw new UnsupportedOperationException("getStrongPower not supported by BlockStateInterfaceAccessWrapper");
+    }
+
+    @Override
+    public WorldType getWorldType() {
+        return this.bsi.world.getWorldType();
+    }
+}