Allow blocks to render in multiple layers

patches/minecraft/net/minecraft/block/Block.java.patch

@@ -161,7 +161,7 @@
      }
  
      protected ItemStack func_180643_i(IBlockState p_180643_1_)
-@@ -971,6 +989,1019 @@
+@@ -971,6 +989,1028 @@
          return Block.EnumOffsetType.NONE;
      }
  
@@ -1153,6 +1153,15 @@
 +        return func_176221_a(state, world, pos);
 +    }
 +
++    /**
++     * Queries if this block should render in a given layer.
++     * ISmartBlockModel can use MinecraftForgeClient.getRenderLayer to alter their model based on layer
++     */
++    public boolean canRenderInLayer(EnumWorldBlockLayer layer)
++    {
++        return func_180664_k() == layer;
++    }
++
 +    // For Internal use only to capture droped items inside getDrops
 +    protected static ThreadLocal<Boolean> captureDrops = new ThreadLocal<Boolean>()
 +    {

patches/minecraft/net/minecraft/client/renderer/chunk/RenderChunk.java.patch

@@ -9,3 +9,22 @@
                  {
                      TileEntity tileentity = regionrendercache.func_175625_s(new BlockPos(mutableblockpos));
  
+@@ -160,7 +160,9 @@
+                     }
+                 }
+ 
+-                EnumWorldBlockLayer enumworldblocklayer1 = block.func_180664_k();
++                for(EnumWorldBlockLayer enumworldblocklayer1 : EnumWorldBlockLayer.values()) {
++                    if(!block.canRenderInLayer(enumworldblocklayer1)) continue;
++                    net.minecraftforge.client.ForgeHooksClient.setRenderLayer(enumworldblocklayer1);
+                 int i = enumworldblocklayer1.ordinal();
+ 
+                 if (block.func_149645_b() != -1)
+@@ -178,6 +180,7 @@
+                         compiledchunk.func_178486_a(enumworldblocklayer1);
+                     }
+                 }
++                }
+             }
+ 
+             EnumWorldBlockLayer[] aenumworldblocklayer = EnumWorldBlockLayer.values();

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

@@ -26,6 +26,7 @@ import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.BlockPos;
 import net.minecraft.util.EnumChatFormatting;
+import net.minecraft.util.EnumWorldBlockLayer;
 import net.minecraft.util.IRegistry;
 import net.minecraft.util.MovingObjectPosition;
 import net.minecraft.world.IBlockAccess;
@@ -272,6 +273,12 @@ public class ForgeHooksClient
         renderPass = pass;
     }
 
+    static EnumWorldBlockLayer renderLayer = EnumWorldBlockLayer.SOLID;
+    public static void setRenderLayer(EnumWorldBlockLayer layer)
+    {
+        renderLayer = layer;
+    }
+
     public static ModelBase getArmorModel(EntityLivingBase entityLiving, ItemStack itemStack, int slotID, ModelBase _default)
     {
         ModelBase modelbase = itemStack.getItem().getArmorModel(entityLiving, itemStack, slotID);

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

@@ -12,6 +12,7 @@ import com.google.common.collect.Maps;
 
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.EnumWorldBlockLayer;
 import net.minecraftforge.client.IItemRenderer.ItemRenderType;
 
 public class MinecraftForgeClient
@@ -46,6 +47,11 @@ public class MinecraftForgeClient
         return ForgeHooksClient.renderPass;
     }
 
+    public static EnumWorldBlockLayer getRenderLayer()
+    {
+        return ForgeHooksClient.renderLayer;
+    }
+
     private static BitSet stencilBits = new BitSet(8);
     static
     {