Update TextureStitchEvent.Pre to give access to the list of ResourceLocations that will be loaded as textures. (#5870)

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -31,6 +31,7 @@ import java.nio.ByteBuffer;
 import java.nio.FloatBuffer;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 import java.util.Map;
 import java.util.Optional;
 import java.util.Random;
@@ -178,9 +179,9 @@ public class ForgeHooksClient
         return MinecraftForge.EVENT_BUS.post(new RenderSpecificHandEvent(hand, partialTicks, interpPitch, swingProgress, equipProgress, stack));
     }
 
-    public static void onTextureStitchedPre(AtlasTexture map)
+    public static void onTextureStitchedPre(AtlasTexture map, Set<ResourceLocation> resourceLocations)
     {
-        ModLoader.get().postEvent(new TextureStitchEvent.Pre(map));
+        ModLoader.get().postEvent(new TextureStitchEvent.Pre(map, resourceLocations));
 //        ModelLoader.White.INSTANCE.register(map); // TODO Custom TAS
         ModelDynBucket.LoaderDynBucket.INSTANCE.register(map);
     }

src/main/java/net/minecraftforge/client/event/TextureStitchEvent.java

@@ -19,9 +19,12 @@
 
 package net.minecraftforge.client.event;
 
+import net.minecraft.util.ResourceLocation;
 import net.minecraftforge.eventbus.api.Event;
 import net.minecraft.client.renderer.texture.AtlasTexture;
 
+import java.util.Set;
+
 
 public class TextureStitchEvent extends Event
 {
@@ -38,17 +41,29 @@ public class TextureStitchEvent extends Event
     }
 
     /**
-     * Fired when the TextureMap is told to refresh it's stitched texture. 
-     * Called after the Stitched list is cleared, but before any blocks or items
-     * add themselves to the list.
+     * Fired when the TextureMap is told to refresh it's stitched texture.
+     * Called before the {@link net.minecraft.client.renderer.texture.TextureAtlasSprite} are loaded.
      */
     public static class Pre extends TextureStitchEvent
     {
-        public Pre(AtlasTexture map){ super(map); }
+        private final Set<ResourceLocation> sprites;
+
+        public Pre(AtlasTexture map, Set<ResourceLocation> sprites)
+        {
+            super(map);
+            this.sprites = sprites;
+        }
+
+        /**
+         * Add a sprite to be stitched into the Texture Atlas.
+         */
+        public boolean addSprite(ResourceLocation sprite) {
+            return this.sprites.add(sprite);
+        }
     }
 
     /**
-     * This event is fired once the texture map has loaded all textures and 
+     * This event is fired once the texture map has loaded all textures and
      * stitched them together. All Icons should have there locations defined
      * by the time this is fired.
      */