src/main/java/com/irtimaled/bbor/client/interop/SpawnableBlocksHelper.java

   1 package com.irtimaled.bbor.client.interop;
   2
   3 import com.irtimaled.bbor.common.models.Coords;
   4 import net.minecraft.block.Block;
   5 import net.minecraft.block.BlockState;
   6 import net.minecraft.client.MinecraftClient;
   7 import net.minecraft.entity.EntityType;
   8 import net.minecraft.entity.SpawnGroup;
   9 import net.minecraft.tag.BiomeTags;
  10 import net.minecraft.tag.BlockTags;
  11 import net.minecraft.util.math.BlockPos;
  12 import net.minecraft.util.math.Direction;
  13 import net.minecraft.util.registry.RegistryEntry;
  14 import net.minecraft.util.shape.VoxelShape;
  15 import net.minecraft.world.LightType;
  16 import net.minecraft.world.World;
  17 import net.minecraft.world.biome.Biome;
  18 import net.minecraft.world.biome.BiomeKeys;
  19
  20 public class SpawnableBlocksHelper {
  21     private static final EntityType entityType = EntityType.Builder.create(SpawnGroup.MONSTER)
  22             .setDimensions(0f, 0f).disableSaving().build(null);
  23
  24     public static void findSpawnableBlocks(Coords coords, int width, int height, BlockProcessor blockProcessor) {
  25         int blockX = coords.getX();
  26         int minX = blockX - width;
  27         int maxX = blockX + width + 1;
  28
  29         int blockZ = coords.getZ();
  30         int minZ = blockZ - width;
  31         int maxZ = blockZ + width + 1;
  32
  33         int blockY = coords.getY();
  34         int minY = Math.max(1, blockY - height);
  35         int maxY = Math.min(255, blockY + height);
  36
  37         World world = MinecraftClient.getInstance().world;
  38         for (int x = minX; x < maxX; x++) {
  39             for (int z = minZ; z < maxZ; z++) {
  40                 BlockState upperBlockState = world.getBlockState(new BlockPos(x, minY - 1, z));
  41                 for (int y = Math.max(1, minY); y < maxY; y++) {
  42                     BlockState spawnBlockState = upperBlockState;
  43                     BlockPos pos = new BlockPos(x, y, z);
  44                     upperBlockState = world.getBlockState(pos);
  45                     if (isSpawnable(world, pos, spawnBlockState, upperBlockState)) {
  46                         blockProcessor.process(pos);
  47                     }
  48                 }
  49             }
  50         }
  51     }
  52
  53     static boolean isSpawnable(World world, BlockPos pos, BlockState spawnBlockState, BlockState upperBlockState) {
  54         VoxelShape collisionShape = upperBlockState.getCollisionShape(world, pos);
  55         RegistryEntry<Biome> entry = world.getBiome(pos);
  56         Biome biome = entry.value();
  57         boolean isNether = entry.isIn(BiomeTags.IS_NETHER);
  58         return entry == BiomeKeys.MUSHROOM_FIELDS &&
  59                 spawnBlockState.allowsSpawning(world, pos.down(), isNether ? EntityType.ZOMBIFIED_PIGLIN : entityType) &&
  60                 !Block.isFaceFullSquare(collisionShape, Direction.UP) &&
  61                 !upperBlockState.emitsRedstonePower() &&
  62                 !upperBlockState.isIn(BlockTags.RAILS) &&
  63                 collisionShape.getMax(Direction.Axis.Y) <= 0 &&
  64                 upperBlockState.getFluidState().isEmpty() &&
  65                 (isNether || world.getLightLevel(LightType.BLOCK, pos) <= 7);
  66     }
  67 }