Allow model jsons to override the material library used by OBJ models.

Fix model loader test mod resources.
Update licenses.

src/main/java/net/minecraftforge/client/model/obj/MaterialLibrary.java

@@ -26,11 +26,17 @@ import net.minecraft.client.renderer.Vector4f;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Map;
+import java.util.NoSuchElementException;
 
 public class MaterialLibrary
 {
+    public static final MaterialLibrary EMPTY = new MaterialLibrary();
     final Map<String, Material> materials = Maps.newHashMap();
 
+    private MaterialLibrary()
+    {
+    }
+
     public MaterialLibrary(OBJLoader.LineReader reader) throws IOException
     {
         Material currentMaterial = null;
@@ -97,10 +103,12 @@ public class MaterialLibrary
 
     public Material getMaterial(String mat)
     {
+        if (!materials.containsKey(mat))
+            throw new NoSuchElementException("The material was not found in the library: " + mat);
         return materials.get(mat);
     }
 
-    public class Material
+    public static class Material
     {
         public final String name;
         public Vector4f ambientColor = new Vector4f(0,0,0,1);

src/main/java/net/minecraftforge/client/model/obj/OBJLoader.java

@@ -67,17 +67,19 @@ public class OBJLoader implements IModelLoader<OBJModel>
         boolean diffuseLighting = JSONUtils.getBoolean(modelContents, "diffuseLighting", false);
         boolean flipV = JSONUtils.getBoolean(modelContents, "flip-v", false);
         boolean ambientToFullbright = JSONUtils.getBoolean(modelContents, "ambientToFullbright", true);
+        @Nullable
+        String materialLibraryOverrideLocation = modelContents.has("materialLibraryOverride") ? JSONUtils.getString(modelContents, "materialLibraryOverride") : null;
 
-        return loadModel(new ResourceLocation(modelLocation), detectCullableFaces, diffuseLighting, flipV, ambientToFullbright);
+        return loadModel(new ModelSettings(new ResourceLocation(modelLocation), detectCullableFaces, diffuseLighting, flipV, ambientToFullbright, materialLibraryOverrideLocation));
     }
 
-    public OBJModel loadModel(ResourceLocation modelLocation, boolean detectCullableFaces, boolean diffuseLighting, boolean flipV, boolean ambientToFullbright)
+    public OBJModel loadModel(ModelSettings settings)
     {
-        return modelCache.computeIfAbsent(new ModelSettings(modelLocation, detectCullableFaces, diffuseLighting, flipV, ambientToFullbright), (data) -> {
+        return modelCache.computeIfAbsent(settings, (data) -> {
             IResource resource;
             try
             {
-                resource = manager.getResource(modelLocation);
+                resource = manager.getResource(settings.modelLocation);
             }
             catch (IOException e)
             {
@@ -86,7 +88,7 @@ public class OBJLoader implements IModelLoader<OBJModel>
 
             try(LineReader rdr = new LineReader(resource))
             {
-                return new OBJModel(modelLocation, rdr, detectCullableFaces, diffuseLighting, flipV, ambientToFullbright);
+                return new OBJModel(rdr, settings);
             }
             catch (Exception e)
             {
@@ -133,6 +135,7 @@ public class OBJLoader implements IModelLoader<OBJModel>
         @Nullable
         public String[] readAndSplitLine(boolean ignoreEmptyLines) throws IOException
         {
+            //noinspection LoopConditionNotUpdatedInsideLoop
             do
             {
                 String currentLine = lineReader.readLine();
@@ -170,7 +173,7 @@ public class OBJLoader implements IModelLoader<OBJModel>
                 if (lineParts.size() > 0)
                     return lineParts.toArray(new String[0]);
             }
-            while (ignoreEmptyLines); // conditional expression is not updated, yes, I know.
+            while (ignoreEmptyLines);
 
             return new String[0];
         }
@@ -183,22 +186,26 @@ public class OBJLoader implements IModelLoader<OBJModel>
         }
     }
 
-    private class ModelSettings
+    public static class ModelSettings
     {
         @Nonnull
-        private final ResourceLocation modelLocation;
-        private final boolean detectCullableFaces;
-        private final boolean diffuseLighting;
-        private final boolean flipV;
-        private final boolean ambientToFullbright;
+        public final ResourceLocation modelLocation;
+        public final boolean detectCullableFaces;
+        public final boolean diffuseLighting;
+        public final boolean flipV;
+        public final boolean ambientToFullbright;
+        @Nullable
+        public final String materialLibraryOverrideLocation;
 
-        public ModelSettings(@Nonnull ResourceLocation modelLocation, boolean detectCullableFaces, boolean diffuseLighting, boolean flipV, boolean ambientToFullbright)
+        public ModelSettings(@Nonnull ResourceLocation modelLocation, boolean detectCullableFaces, boolean diffuseLighting, boolean flipV, boolean ambientToFullbright,
+                             @Nullable String materialLibraryOverrideLocation)
         {
             this.modelLocation = modelLocation;
             this.detectCullableFaces = detectCullableFaces;
             this.diffuseLighting = diffuseLighting;
             this.flipV = flipV;
             this.ambientToFullbright = ambientToFullbright;
+            this.materialLibraryOverrideLocation = materialLibraryOverrideLocation;
         }
 
         @Override
@@ -216,13 +223,14 @@ public class OBJLoader implements IModelLoader<OBJModel>
                     diffuseLighting == that.diffuseLighting &&
                     flipV == that.flipV &&
                     ambientToFullbright == that.ambientToFullbright &&
-                    modelLocation.equals(that.modelLocation);
+                    modelLocation.equals(that.modelLocation) &&
+                    Objects.equals(materialLibraryOverrideLocation, that.materialLibraryOverrideLocation);
         }
 
         @Override
         public int hashCode()
         {
-            return Objects.hash(modelLocation, detectCullableFaces, diffuseLighting, flipV, ambientToFullbright);
+            return Objects.hash(modelLocation, detectCullableFaces, diffuseLighting, flipV, ambientToFullbright, materialLibraryOverrideLocation);
         }
     }
 }

src/main/java/net/minecraftforge/client/model/obj/OBJModel.java

@@ -73,13 +73,18 @@ public class OBJModel implements IMultipartModelGeometry<OBJModel>
 
     public final ResourceLocation modelLocation;
 
-    OBJModel(ResourceLocation modelLocation, OBJLoader.LineReader reader, boolean detectCullableFaces, boolean diffuseLighting, boolean flipV, boolean ambientToFullbright) throws IOException
+    @Nullable
+    public final String materialLibraryOverrideLocation;
+
+
+    OBJModel(OBJLoader.LineReader reader, OBJLoader.ModelSettings settings) throws IOException
     {
-        this.modelLocation = modelLocation;
-        this.detectCullableFaces = detectCullableFaces;
-        this.diffuseLighting = diffuseLighting;
-        this.flipV = flipV;
-        this.ambientToFullbright = ambientToFullbright;
+        this.modelLocation = settings.modelLocation;
+        this.detectCullableFaces = settings.detectCullableFaces;
+        this.diffuseLighting = settings.diffuseLighting;
+        this.flipV = settings.flipV;
+        this.ambientToFullbright = settings.ambientToFullbright;
+        this.materialLibraryOverrideLocation = settings.materialLibraryOverrideLocation;
 
         // for relative references to material libraries
         String modelDomain = modelLocation.getNamespace();
@@ -90,7 +95,7 @@ public class OBJModel implements IMultipartModelGeometry<OBJModel>
         else
             modelPath = "";
 
-        MaterialLibrary mtllib = null;
+        MaterialLibrary mtllib = MaterialLibrary.EMPTY;
         MaterialLibrary.Material currentMat = null;
         String currentSmoothingGroup = null;
         ModelGroup currentGroup = null;
@@ -99,6 +104,15 @@ public class OBJModel implements IMultipartModelGeometry<OBJModel>
 
         boolean objAboveGroup = false;
 
+        if (materialLibraryOverrideLocation != null)
+        {
+            String lib = materialLibraryOverrideLocation;
+            if (lib.contains(":"))
+                mtllib = OBJLoader.INSTANCE.loadMaterialLibrary(new ResourceLocation(lib));
+            else
+                mtllib = OBJLoader.INSTANCE.loadMaterialLibrary(new ResourceLocation(modelDomain, modelPath + lib));
+        }
+
         String[] line;
         while((line = reader.readAndSplitLine(true)) != null)
         {
@@ -106,6 +120,9 @@ public class OBJModel implements IMultipartModelGeometry<OBJModel>
             {
                 case "mtllib": // Loads material library
                 {
+                    if (materialLibraryOverrideLocation != null)
+                        break;
+
                     String lib = line[1];
                     if (lib.contains(":"))
                         mtllib = OBJLoader.INSTANCE.loadMaterialLibrary(new ResourceLocation(lib));

src/test/java/net/minecraftforge/debug/client/model/TRSRTransformerTest.java

@@ -1,3 +1,22 @@
+/*
+ * Minecraft Forge
+ * Copyright (c) 2016-2019.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
 package net.minecraftforge.debug.client.model;
 
 import com.google.common.collect.ImmutableList;