Destroyed Triple layer metatiles (markdown)

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-**--UPDATE THIS WIKI PAGE TO USE TRUE TRIPLE LAYER METATILES IN PORYMAP, AND MENTION PORYMAP--**
-
-Overworld maps are built out of blocks of tiles. Those blocks get placed in three overlapping layers, but only two layers can be used at a time. [A popular binary hack](https://www.pokecommunity.com/showthread.php?t=352725) allows triple-layer blocks, using all three layers at once by combining two blocks: one for the bottom and middle layers, and a subsequent "burner" block for the top layer.
-
-To allow this in pokeemerald, just edit [src/field_camera.c](../blob/master/src/field_camera.c):
-
-```diff
- static void DrawMetatile(s32 metatileLayerType, u16 *metatiles, u16 offset)
- {
-     switch (metatileLayerType)
-     {
-+    case 3: // LAYER_TYPE_TRIPLE
-+        // Draw metatile's bottom layer to the bottom background layer.
-+        gBGTilemapBuffers3[offset] = metatiles[0];
-+        gBGTilemapBuffers3[offset + 1] = metatiles[1];
-+        gBGTilemapBuffers3[offset + 0x20] = metatiles[2];
-+        gBGTilemapBuffers3[offset + 0x21] = metatiles[3];
-+
-+        // Draw metatile's top layer to the middle background layer.
-+        gBGTilemapBuffers1[offset] = metatiles[4];
-+        gBGTilemapBuffers1[offset + 1] = metatiles[5];
-+        gBGTilemapBuffers1[offset + 0x20] = metatiles[6];
-+        gBGTilemapBuffers1[offset + 0x21] = metatiles[7];
-+        
-+        // Draw next metatile's top layer to the top background layer
-+        gBGTilemapBuffers2[offset] = metatiles[12];
-+        gBGTilemapBuffers2[offset + 1] = metatiles[13];
-+        gBGTilemapBuffers2[offset + 0x20] = metatiles[14];
-+        gBGTilemapBuffers2[offset + 0x21] = metatiles[15];
-+        break;
-     case 2: // LAYER_TYPE_
-         // Draw metatile's bottom layer to the bottom background layer.
-         gBGTilemapBuffers3[offset] = metatiles[0];
-         gBGTilemapBuffers3[offset + 1] = metatiles[1];
-         gBGTilemapBuffers3[offset + 0x20] = metatiles[2];
-         gBGTilemapBuffers3[offset + 0x21] = metatiles[3];
- 
-         // Draw transparent tiles to the middle background layer.
-         gBGTilemapBuffers1[offset] = 0;
-         gBGTilemapBuffers1[offset + 1] = 0;
-         gBGTilemapBuffers1[offset + 0x20] = 0;
-         gBGTilemapBuffers1[offset + 0x21] = 0;
- 
-         // Draw metatile's top layer to the top background layer.
-         gBGTilemapBuffers2[offset] = metatiles[4];
-         gBGTilemapBuffers2[offset + 1] = metatiles[5];
-         gBGTilemapBuffers2[offset + 0x20] = metatiles[6];
-         gBGTilemapBuffers2[offset + 0x21] = metatiles[7];
-         break;
-     case 1:  // LAYER_TYPE_COVERED_BY_OBJECTS
-         // Draw metatile's bottom layer to the bottom background layer.
-         gBGTilemapBuffers3[offset] = metatiles[0];
-         gBGTilemapBuffers3[offset + 1] = metatiles[1];
-         gBGTilemapBuffers3[offset + 0x20] = metatiles[2];
-         gBGTilemapBuffers3[offset + 0x21] = metatiles[3];
- 
-         // Draw metatile's top layer to the middle background layer.
-         gBGTilemapBuffers1[offset] = metatiles[4];
-         gBGTilemapBuffers1[offset + 1] = metatiles[5];
-         gBGTilemapBuffers1[offset + 0x20] = metatiles[6];
-         gBGTilemapBuffers1[offset + 0x21] = metatiles[7];
- 
-         // Draw transparent tiles to the top background layer.
-         gBGTilemapBuffers2[offset] = 0;
-         gBGTilemapBuffers2[offset + 1] = 0;
-         gBGTilemapBuffers2[offset + 0x20] = 0;
-         gBGTilemapBuffers2[offset + 0x21] = 0;
-         break;
-     case 0: // LAYER_TYPE_NORMAL
-         // Draw garbage to the bottom background layer.
-         gBGTilemapBuffers3[offset] = 0x3014;
-         gBGTilemapBuffers3[offset + 1] = 0x3014;
-         gBGTilemapBuffers3[offset + 0x20] = 0x3014;
-         gBGTilemapBuffers3[offset + 0x21] = 0x3014;
- 
-         // Draw metatile's bottom layer to the middle background layer.
-         gBGTilemapBuffers1[offset] = metatiles[0];
-         gBGTilemapBuffers1[offset + 1] = metatiles[1];
-         gBGTilemapBuffers1[offset + 0x20] = metatiles[2];
-         gBGTilemapBuffers1[offset + 0x21] = metatiles[3];
- 
-         // Draw metatile's top layer to the top background layer, which covers event object sprites.
-         gBGTilemapBuffers2[offset] = metatiles[4];
-         gBGTilemapBuffers2[offset + 1] = metatiles[5];
-         gBGTilemapBuffers2[offset + 0x20] = metatiles[6];
-         gBGTilemapBuffers2[offset + 0x21] = metatiles[7];
-         break;
-     }
-     schedule_bg_copy_tilemap_to_vram(1);
-     schedule_bg_copy_tilemap_to_vram(2);
-     schedule_bg_copy_tilemap_to_vram(3);
- }
-```
-
-This is slightly different from the binary technique. The topmost third layer comes from the "burner" block's *top* layer, not its *bottom* layer. That means the burner block's bottom layer can still be used. So it's not really "wasted" because it can still be useful on its own.
-
-For example, if the first block has a bottom layer of water and a top layer of shoreline, and the burner block has a bottom layer of grass and a top layer of tree, then the first block will show the tree above the water and shoreline, while the burner block will show the tree above the grass.
-
-The problem is, [porymap](https://github.com/huderlem/porymap/) doesn't support any layer types besides the default ones: "Normal - Middle/Top", "Covered - Bottom/Middle", and "Split - Bottom/Top". (Their correspondence to the cases in the `DrawMetatile` code should be apparent.) Possible workarounds:
-
-- Keep an eye on [this issue](https://github.com/huderlem/porymap/issues/147) to see if porymap adds support for custom layer types.
-- [Build your own](https://github.com/huderlem/porymap/blob/master/INSTALL.md) copy of porymap, but edit [src/ui/tileseteditor.cpp](https://github.com/huderlem/porymap/blob/master/src/ui/tileseteditor.cpp) to support triple-layer blocks. After the line:
-
-      this->ui->comboBox_layerType->addItem("Split - Bottom/Top", 2);
-
-  just add another line:
-
-      this->ui->comboBox_layerType->addItem("Triple - Bottom/Middle/Top", 3);
-
-- Hex-edit the metatile_attributes.bin files to use layer type 3. This is cumbersome compared to using porymap, but it's not a complex format. Every two bytes correspond to a block: the first byte is its behavior value, the second byte is its layer type but shifted to the first nybble. So Normal is $00, Covered is $10, and Split is $20. Just find the pair of bytes for your triple-layer block (the first one, not the burner one) and change its layer type byte to $30.