src/game/java/net/minecraft/client/renderer/item/ItemModels.java

package net.minecraft.client.renderer.item;

import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.util.ExtraCodecs;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class ItemModels {
    private static final ExtraCodecs.LateBoundIdMapper<ResourceLocation, MapCodec<? extends ItemModel.Unbaked>> ID_MAPPER = new ExtraCodecs.LateBoundIdMapper<>();
    public static final Codec<ItemModel.Unbaked> CODEC = ID_MAPPER.codec(ResourceLocation.CODEC)
        .dispatch(ItemModel.Unbaked::type, p_375869_ -> p_375869_);

    public static void bootstrap() {
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("empty"), EmptyModel.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("model"), BlockModelWrapper.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("range_dispatch"), RangeSelectItemModel.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("special"), SpecialModelWrapper.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("composite"), CompositeModel.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("bundle/selected_item"), BundleSelectedItemSpecialRenderer.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("select"), SelectItemModel.Unbaked.MAP_CODEC);
        ID_MAPPER.put(ResourceLocation.withDefaultNamespace("condition"), ConditionalItemModel.Unbaked.MAP_CODEC);
    }
}