Fix model parents not always being resolved

This would cause models to sometimes not appear at all (CC turtles were one reproduction case)

Author: embeddedt

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

@@ -0,0 +1,39 @@
+package org.embeddedt.modernfix.common.mixin.perf.dynamic_resources;
+
+import com.llamalad7.mixinextras.injector.ModifyReturnValue;
+import net.minecraft.client.resources.model.ModelBakery;
+import net.minecraft.client.resources.model.UnbakedModel;
+import net.minecraft.resources.ResourceLocation;
+import org.embeddedt.modernfix.ModernFix;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(ModelBakery.ModelBakerImpl.class)
+@ClientOnlyMixin
+public abstract class ModelBakerImplMixin {
+    @Shadow public abstract UnbakedModel getModel(ResourceLocation location);
+
+    @Unique
+    private int mfix$getDepth = 0;
+
+    /**
+     * @author embeddedt
+     * @reason force parent resolution to happen before model gets baked
+     */
+    @ModifyReturnValue(method = "getModel", at = @At("RETURN"))
+    private UnbakedModel resolveParents(UnbakedModel model) {
+        mfix$getDepth++;
+        if(mfix$getDepth == 1) {
+            try {
+                model.resolveParents(this::getModel);
+            } catch(Exception e) {
+                ModernFix.LOGGER.warn("Exception encountered resolving parents", e);
+            }
+        }
+        mfix$getDepth--;
+        return model;
+    }
+}