Furnace minecarts loading chunks around them

src/main/java/xyz/pixelatedw/finalbeta/ModConfig.java

@@ -46,6 +46,8 @@ public class ModConfig {
 			"Extra speed modifier when minecarts go over powered rails\nVanilla default is 1.0");
 	public static final Option<Boolean> FURNACE_MINECART_PUSH = make("Enable furnace minecarts push", true,
 			"Enables furance minecarts to push forward the first minecart it comes in contact with");
+	public static final Option<Boolean> FURNACE_MINECART_CHUNK_LOADING = make("Enable furnace minecarts to load chunks", true,
+			"Name says it all, furnace minecarts will load chunks as they go on tracks.");
 	
 	public static final Option<Boolean> FIX_BOW_MODEL = make("Fix bow model", true,
 			"Makes the box model held by players and skeletons bigger and facing forward");

src/main/java/xyz/pixelatedw/finalbeta/WyHelper.java

@@ -8,6 +8,8 @@ import java.util.HashMap;
 
 import net.minecraft.client.Minecraft;
 import net.minecraft.entity.player.Player;
+import net.minecraft.item.ItemInstance;
+import net.minecraft.item.ItemType;
 
 public class WyHelper {
 	
@@ -92,11 +94,26 @@ public class WyHelper {
 	}
 
 	public static void cheatCommand(Player player) {
-//		player.dropItem(new ItemInstance(Tile.LADDER, 64));
-//		player.dropItem(new ItemInstance(ItemType.minecartChest, 1));
-//		player.dropItem(new ItemInstance(ItemType.coal, 64));
-//		player.dropItem(new ItemInstance(Tile.GOLDEN_RAIL, 64));
+		player.level.entities.stream().filter(e -> !(e instanceof Player)).forEach((e) -> ((net.minecraft.entity.Entity)e).remove());
 
+//		player.dropItem(new ItemInstance(Tile.LADDER, 64));
+		player.dropItem(new ItemInstance(ItemType.minecart, 1));
+		player.dropItem(new ItemInstance(ItemType.minecartFurnace, 1));
+		player.dropItem(new ItemInstance(ItemType.coal, 64));
+//		player.dropItem(new ItemInstance(Tile.GOLDEN_RAIL, 64));
+//		player.dropItem(new ItemInstance(Tile.COBBLESTONE, 64));
+
+//		player.level.setTile((int)player.x, (int)player.y, (int)player.z, Tile.COBBLESTONE.id);
+		
+//		int x = 248;
+//		int y = 79;
+//		int z = -65;
+//		
+//		for (int i = 0; i < 500; i++) {
+//			player.level.setTile(x + i, y, z, Tile.REDSTONE_TORCH_LIT.id);
+//		}
+		
+		
 		player.level.setLevelTime(0);
 		player.level.getProperties().setRaining(false);
 		player.level.getProperties().setRainTime(0);

src/main/java/xyz/pixelatedw/finalbeta/mixin/LevelMixin.java

@@ -5,7 +5,11 @@ import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.Minecart;
 import net.minecraft.level.Level;
+import net.minecraft.util.maths.MathsHelper;
+import xyz.pixelatedw.finalbeta.ModConfig;
 import xyz.pixelatedw.finalbeta.WyHelper;
 
 @Mixin(Level.class)
@@ -16,4 +20,38 @@ public class LevelMixin {
 		WyHelper.playTime++;
 	}
 	
+	@Inject(method="updatePosition", at = @At("TAIL"))
+	public void updatePosition(Entity entity, boolean forceUpdate, CallbackInfo ci) {
+		if (ModConfig.FURNACE_MINECART_CHUNK_LOADING.get() && entity instanceof Minecart) {
+			Minecart minecart = ((Minecart) entity);
+			int x = MathsHelper.floor(entity.x);
+			int z = MathsHelper.floor(entity.z);
+			/*
+			 * TODO This is very likely not optimal, we could probably do better
+			 * and only load "forward" chunks relative to the cart's direction,
+			 * but its barely noticeable in my tests and at least at the moment
+			 * I don't care enough for this optimization.
+			 */
+			int area = 64;
+			boolean isRegionLoaded = entity.level.isRegionLoaded(x - area, 0, z - area, x + area, 128, z + area);
+			if (!isRegionLoaded && minecart.type == 2) {
+				loadRegion(entity.level, x - area, z - area, x + area, z + area);
+			}
+		}
+	}
+	
+	private void loadRegion(Level level, int minX, int minZ, int maxX, int maxZ) {
+		minX >>= 4;
+		minZ >>= 4;
+		maxX >>= 4;
+		maxZ >>= 4;
+
+		for (int x = minX; x <= maxX; ++x) {
+			for (int z = minZ; z <= maxZ; ++z) {
+				if (!level.getLevelSource().isChunkLoaded(x, z)) {
+					level.getLevelSource().loadChunk(x, z);
+				}
+			}
+		}
+	}
 }

src/main/java/xyz/pixelatedw/finalbeta/mixin/MinecartMixin.java

@@ -66,7 +66,7 @@ public class MinecartMixin {
 	private double getSpeedLimit(final double speedLimit) {
 		return ModConfig.MINECART_MAX_SPEED.get();
 	}
-	
+
 	@Inject(method = "tick", at = @At("TAIL"))
 	public void tick(CallbackInfo ci) {
 		Minecart minecart = (Minecart) (Object) this;