Code/net/minecraft/data/worldgen/placement/PlacementUtils.java

package net.minecraft.data.worldgen.placement;

import java.util.List;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Holder;
import net.minecraft.core.registries.Registries;
import net.minecraft.data.worldgen.BootstrapContext;
import net.minecraft.resources.ResourceKey;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.util.random.WeightedList;
import net.minecraft.util.valueproviders.ConstantInt;
import net.minecraft.util.valueproviders.IntProvider;
import net.minecraft.util.valueproviders.WeightedListInt;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.levelgen.Heightmap;
import net.minecraft.world.level.levelgen.VerticalAnchor;
import net.minecraft.world.level.levelgen.blockpredicates.BlockPredicate;
import net.minecraft.world.level.levelgen.feature.ConfiguredFeature;
import net.minecraft.world.level.levelgen.feature.Feature;
import net.minecraft.world.level.levelgen.feature.configurations.FeatureConfiguration;
import net.minecraft.world.level.levelgen.placement.BlockPredicateFilter;
import net.minecraft.world.level.levelgen.placement.CountPlacement;
import net.minecraft.world.level.levelgen.placement.HeightRangePlacement;
import net.minecraft.world.level.levelgen.placement.HeightmapPlacement;
import net.minecraft.world.level.levelgen.placement.PlacedFeature;
import net.minecraft.world.level.levelgen.placement.PlacementFilter;
import net.minecraft.world.level.levelgen.placement.PlacementModifier;

public class PlacementUtils {
    public static final PlacementModifier HEIGHTMAP = HeightmapPlacement.onHeightmap(Heightmap.Types.MOTION_BLOCKING);
    public static final PlacementModifier HEIGHTMAP_NO_LEAVES = HeightmapPlacement.onHeightmap(Heightmap.Types.MOTION_BLOCKING_NO_LEAVES);
    public static final PlacementModifier HEIGHTMAP_TOP_SOLID = HeightmapPlacement.onHeightmap(Heightmap.Types.OCEAN_FLOOR_WG);
    public static final PlacementModifier HEIGHTMAP_WORLD_SURFACE = HeightmapPlacement.onHeightmap(Heightmap.Types.WORLD_SURFACE_WG);
    public static final PlacementModifier HEIGHTMAP_OCEAN_FLOOR = HeightmapPlacement.onHeightmap(Heightmap.Types.OCEAN_FLOOR);
    public static final PlacementModifier FULL_RANGE = HeightRangePlacement.uniform(VerticalAnchor.bottom(), VerticalAnchor.top());
    public static final PlacementModifier RANGE_10_10 = HeightRangePlacement.uniform(VerticalAnchor.aboveBottom(10), VerticalAnchor.belowTop(10));
    public static final PlacementModifier RANGE_8_8 = HeightRangePlacement.uniform(VerticalAnchor.aboveBottom(8), VerticalAnchor.belowTop(8));
    public static final PlacementModifier RANGE_4_4 = HeightRangePlacement.uniform(VerticalAnchor.aboveBottom(4), VerticalAnchor.belowTop(4));
    public static final PlacementModifier RANGE_BOTTOM_TO_MAX_TERRAIN_HEIGHT = HeightRangePlacement.uniform(VerticalAnchor.bottom(), VerticalAnchor.absolute(256));

    public static void bootstrap(BootstrapContext<PlacedFeature> p_333757_) {
        AquaticPlacements.bootstrap(p_333757_);
        CavePlacements.bootstrap(p_333757_);
        EndPlacements.bootstrap(p_333757_);
        MiscOverworldPlacements.bootstrap(p_333757_);
        NetherPlacements.bootstrap(p_333757_);
        OrePlacements.bootstrap(p_333757_);
        TreePlacements.bootstrap(p_333757_);
        VegetationPlacements.bootstrap(p_333757_);
        VillagePlacements.bootstrap(p_333757_);
    }

    public static ResourceKey<PlacedFeature> createKey(String p_256293_) {
        return ResourceKey.create(Registries.PLACED_FEATURE, ResourceLocation.withDefaultNamespace(p_256293_));
    }

    public static void register(
        BootstrapContext<PlacedFeature> p_334230_,
        ResourceKey<PlacedFeature> p_255820_,
        Holder<ConfiguredFeature<?, ?>> p_255813_,
        List<PlacementModifier> p_256042_
    ) {
        p_334230_.register(p_255820_, new PlacedFeature(p_255813_, List.copyOf(p_256042_)));
    }

    public static void register(
        BootstrapContext<PlacedFeature> p_334879_,
        ResourceKey<PlacedFeature> p_256614_,
        Holder<ConfiguredFeature<?, ?>> p_255855_,
        PlacementModifier... p_256413_
    ) {
        register(p_334879_, p_256614_, p_255855_, List.of(p_256413_));
    }

    public static PlacementModifier countExtra(int p_195365_, float p_195366_, int p_195367_) {
        float f = 1.0F / p_195366_;
        if (Math.abs(f - (int)f) > 1.0E-5F) {
            throw new IllegalStateException("Chance data cannot be represented as list weight");
        } else {
            WeightedList<IntProvider> weightedlist = WeightedList.<IntProvider>builder()
                .add(ConstantInt.of(p_195365_), (int)f - 1)
                .add(ConstantInt.of(p_195365_ + p_195367_), 1)
                .build();
            return CountPlacement.of(new WeightedListInt(weightedlist));
        }
    }

    public static PlacementFilter isEmpty() {
        return BlockPredicateFilter.forPredicate(BlockPredicate.ONLY_IN_AIR_PREDICATE);
    }

    public static BlockPredicateFilter filteredByBlockSurvival(Block p_206494_) {
        return BlockPredicateFilter.forPredicate(BlockPredicate.wouldSurvive(p_206494_.defaultBlockState(), BlockPos.ZERO));
    }

    public static Holder<PlacedFeature> inlinePlaced(Holder<ConfiguredFeature<?, ?>> p_206507_, PlacementModifier... p_206508_) {
        return Holder.direct(new PlacedFeature(p_206507_, List.of(p_206508_)));
    }

    public static <FC extends FeatureConfiguration, F extends Feature<FC>> Holder<PlacedFeature> inlinePlaced(
        F p_206503_, FC p_206504_, PlacementModifier... p_206505_
    ) {
        return inlinePlaced(Holder.direct(new ConfiguredFeature(p_206503_, p_206504_)), p_206505_);
    }

    public static <FC extends FeatureConfiguration, F extends Feature<FC>> Holder<PlacedFeature> onlyWhenEmpty(F p_206496_, FC p_206497_) {
        return filtered(p_206496_, p_206497_, BlockPredicate.ONLY_IN_AIR_PREDICATE);
    }

    public static <FC extends FeatureConfiguration, F extends Feature<FC>> Holder<PlacedFeature> filtered(F p_206499_, FC p_206500_, BlockPredicate p_206501_) {
        return inlinePlaced(p_206499_, p_206500_, BlockPredicateFilter.forPredicate(p_206501_));
    }
}