Work around NPEs from early queries to ModelManager

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/common/mixin/perf/dynamic_resources/ModelManagerMixin.java

@@ -0,0 +1,26 @@
+package org.embeddedt.modernfix.common.mixin.perf.dynamic_resources;
+
+import net.minecraft.client.resources.model.BakedModel;
+import net.minecraft.client.resources.model.ModelManager;
+import net.minecraft.resources.ResourceLocation;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Mixin(ModelManager.class)
+public class ModelManagerMixin {
+    @Shadow private Map<ResourceLocation, BakedModel> bakedRegistry;
+
+    @Inject(method = "<init>", at = @At("RETURN"))
+    private void injectDummyBakedRegistry(CallbackInfo ci) {
+        if(this.bakedRegistry == null) {
+            // Create a dummy baked registry. This prevents NPEs when mods query block models too early
+            this.bakedRegistry = new HashMap<>();
+        }
+    }
+}