feat(day 2): load programmer art in memory

src/main/java/gay/sylv/legacy_landscape/client/ClientLegacyLandscape.java

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+package gay.sylv.legacy_landscape.client;
+
+import com.mojang.logging.LogUtils;
+import gay.sylv.legacy_landscape.LegacyLandscape;
+import net.minecraft.Util;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.color.block.BlockColors;
+import net.minecraft.client.model.geom.EntityModelSet;
+import net.minecraft.client.renderer.texture.TextureManager;
+import net.minecraft.client.resources.FoliageColorReloadListener;
+import net.minecraft.client.resources.GrassColorReloadListener;
+import net.minecraft.client.resources.SplashManager;
+import net.minecraft.client.resources.model.ModelManager;
+import net.minecraft.server.packs.PackResources;
+import net.minecraft.server.packs.PackType;
+import net.minecraft.server.packs.resources.ReloadableResourceManager;
+import net.minecraft.server.packs.resources.ResourceManagerReloadListener;
+import net.minecraft.util.Unit;
+import net.neoforged.api.distmarker.Dist;
+import net.neoforged.api.distmarker.OnlyIn;
+import net.neoforged.bus.api.SubscribeEvent;
+import net.neoforged.fml.common.EventBusSubscriber;
+import net.neoforged.neoforge.client.event.RegisterClientReloadListenersEvent;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+@OnlyIn(Dist.CLIENT)
+@EventBusSubscriber(
+	modid = LegacyLandscape.MOD_ID,
+	bus = EventBusSubscriber.Bus.MOD
+)
+public final class ClientLegacyLandscape {
+	private static final Logger LOGGER = LogUtils.getLogger();
+
+	private static PackResources programmerArt;
+	private static ReloadableResourceManager resourceManager;
+	private static TextureManager textureManager;
+	private static SplashManager splashManager;
+	private static BlockColors blockColors;
+	private static ModelManager modelManager;
+	private static EntityModelSet entityModels;
+
+	@SubscribeEvent
+	private static void registerReloadListeners(RegisterClientReloadListenersEvent event) {
+		event.registerReloadListener((ResourceManagerReloadListener) resourceManager1 -> {
+			Minecraft client = Minecraft.getInstance();
+			try (PackResources programmerArtResources = Objects.requireNonNull(client.getResourcePackRepository().getPack("programmer_art")).open()) {
+				programmerArt = programmerArtResources;
+				resourceManager = new ReloadableResourceManager(PackType.CLIENT_RESOURCES);
+				textureManager = new TextureManager(resourceManager);
+				resourceManager.registerReloadListener(textureManager);
+				splashManager = new SplashManager(Minecraft.getInstance().getUser());
+				resourceManager.registerReloadListener(splashManager);
+				resourceManager.registerReloadListener(new GrassColorReloadListener());
+				resourceManager.registerReloadListener(new FoliageColorReloadListener());
+				blockColors = BlockColors.createDefault();
+				modelManager = new ModelManager(textureManager, blockColors, 0);
+				resourceManager.registerReloadListener(modelManager);
+				entityModels = new EntityModelSet();
+				resourceManager.registerReloadListener(entityModels);
+			}
+
+			List<PackResources> fullResourcesList = client.getResourceManager().listPacks().collect(Collectors.toCollection(ArrayList::new));
+			fullResourcesList.add(programmerArt);
+			resourceManager.createReload(Util.backgroundExecutor(), client, CompletableFuture.completedFuture(Unit.INSTANCE), fullResourcesList).done().thenRun(() -> LOGGER.info("Loaded programmer art resources"));
+		});
+	}
+}