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Page: Expanding The Metatile Count
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Ability Switcher via special Add A PokeVial Item Add Ability to Avoid Battle Damage in Debug Menu Add Ability to Swap Bikes Whenever Add Choice Specs Scarf hold item effects Add Description Submenu Add Difficulty Mode Add In‐Cart Rumble Add Nuzlocke Challenge Add PC Access in PokeNav Add Physical Special Split Add Sleep Mode Add Thief Ball Add a EV IV Stat Editor UI Add a debug menu Adding Multi region Support Adding Support for Connectivity with Other Hacks Whilst Maintaining Connectivity with Vanilla Adding Time Based Encounters Adding Walking Animations to All NPCs Adding a New Trainer Class Adding a New Trainer Front Picture Adding a Pokémon Type & Disabling the Mystery Type Adding new event object or overworld sprites All Trees Permanently Get Cut Allow All Pokemon to Evolve Without Trading Allow Both Latios and Latias Appear. Allow Feebas to be caught on any Valid Fishing Spot in Route 119 rather than only Three Allow Jumping Over Ledges with Acro Bike Allow Move Relearner to Teach Moves that Pre Evolutions Know Allow Running From Trainer Battles Allow running indoors Amulet Coin Effects If Anyone In Party is Holding It Automatically make the keyboard switch to lowercase after the first character Better White Out Money Calculation Button Press to Skip Copyright Screen Chain Fishing Change Enemy Trainer Parties Depending on Difficulty Change Someone's PC to Lanette's PC from the Start of the Game Change Starter Pokémon Change Time Based Evolution Times Change initial PC items Changing the Battle Music Depending on the Opponent Colored stats by nature in summary screen Converting to FR Tilesets Custom Battle Mugshots Custom Border Dimensions Debugging using gdb (Windows, WSL2, Visual Studio Code mGBA) Debugging using printf Disable Bag Use In Battle Disable Catching Pokemon Disable Pokémon animation on Birch's intro Pokémon Disabling Union Room check when entering Pokémon Centers Dynamic Trade Names Dynamic overworld palette system Enable the Reset RTC Feature Enable trade with FRLG without beating the game Expanding The Metatile Count Extra save space with three lines of code Faster HP Drain Feature Branches Fish Will Now Always Get on Hook Fix AI's Switch In Battle Fix Snow Weather Fixing the aspect ratio of the Pokémon logo on the title screen Forcing Battle Animations for Major Battles Full Screen Start Menu by Archie and Mudskip Gen 6 Exp Share Gen 6 style Exp. Share Alternative Option Get Match Calls Only If Caller Wants a Rematch Get Rid of Battery Run Dry Error Message Get Rid of Pokemon Disobeying You Holding Select Allows For A Second Register Item Home How the Game Works How to Support Savefile Backwards Compatibility How to add a new Pokémon species How to add a new ability How to add a new region map How to create a new regular trainer battle How to delete a map Implement Missing Text Function RESET_FONT Implementing Catch EXP Implementing ipatix's High Quality Audio Mixer Implementing the “textcolor” script command from FRLG and give object events their own text colour Improve Partner Battle Code Improve the Loading of Battle Terrain Improving the WaitForVBlank function Increase money limit Infinite TM usage Instead of Asking to Stop learning a New Move, You'll be Asked to Continue Learning Item Automatically Goes to PC if Bag is Full Keep the Camera from Making Waves LGPE Style Bonus Premier Balls Learn moves upon evolution List Menu Text Coloring Make Cleanse Tag Avoid All Wild Encounters and Usable If Held By Anyone in Your Party; Make PokeDoll Do the Same for Trainers Seeing You Make Daycare Faster at Leveling Pokémon Make Key Items That Cannot Be Used In The Field Not Show A Use or Register Option Make L Button Be Turbo A When L=A Option Is Set Make Ledge Jumps Check Collision Make Move Relearner Teach Egg Moves With A Flag Make Multiple Secret Bases Make Norman's Slaking Have Ability Intimidate Make Pokemon Not Heal When Going into PC Make Pokemon that Require a Fateful Encounter to be Legal to Always Be Set to Legal Make space for EWRAM Data for Summary screen Make the Bag Able to Hold 120 Items Instead of 30 Make the Person in the Intro Match the the Save File Map Based Trainer Battle Music Move Item Multipage Options Menu Name Rater Allows Traded Pokemon to be Renamed New Birch's Briefcase With Fully Custom Starters by Archie and Mudskip New Custom Menu Border Themes (Basic) New Main Menu UI With Mugshot by Archie and Mudskip New Options Plus ‐ Multipage Options Menu with Faster Text, HP‐EXP Bar Speeds and Metric Nickname your Pokémon from the party menu Not showing dex entries until getting the Pokédex Omnidirectional Jump Optimization ‐ Remove Expensive and Redundant `BuildColorMaps()` Function Option to Skip Copyright and Intro Overview: Items and their Effects Overview: The Party Menu Overview∶ The Game Loop Overview∶ The Task System Per Shop\Mart Item Prices Plural Giveitem Pokecenters Disregard Eggs Prompt for reusing Repels Push B in wild battle moves to Run Push B to Toggle Running Shoes Pushing B When Asked To Stop Learning Move Will Cancel Teaching The Move Quickly Run from a Battle by Holding Right While the Wild Pokémon's Name Appears Raise Odds of Catching a Pokemon by Pressing B When the Ball Shakes Random Info, Tips, and Tricks Reflections Remove 'Select' Sound From Specific Map Events Remove Warp Fadescreen Remove badge boosts Remove the backup save file Remove the extra save confirmation Remove the functionally redundant move grammar tables Repeated Field Medicine Use Reuse filler save space for Variables and Flags Revert Brendan May Sprites to Ruby Sapphire Set Metatile IDs From Another Map Set Up Item Balls on a Map Without Needing New Scripts Shifting to Pokémon Already in Battle Exits the Shift Menu Shiny Creation With a Flag Shop Items By Badge Count Show IVs EVs in Summary Screen Show Species That You're Switching For in the Party Menu Show Type Effectiveness In Battle Using Pre Existing Function and Disable in Option Menu Show a throbber animation while the game is saving Shuckle makes Berry Juice Something doesn't work I need help etc. Spawn Invisible Player Speedy Nurse Joy Spinda Second Frame Spot Addition Stair Warps Supplementary Scripting Macros Surfing Dismount Ground Effects Temporarily Replace Player or Enemy Party Pokemon The Basics of Scripting Toggle Trainer Sight Trainer Backsprite Editing Trainer Class Based Poké Balls Trainer Scripts Trainers No Longer Spin to Face You Right As You Pass Them Trigger Map Scripts By Flag Triple layer metatiles Tutorials Tweaking the count of health beeps Uniquely Shuffle Array Update Sitrus Berry's effect to Gen 4 standard Use HMs Without Any Pokemon in your Party Knowing Them Useful Modding Tools Useful Scripting Specials Why You Should (Almost) Always Be Using 32‐Bit Variables in Your Code Why should I use this over binary hacking
43 Expanding The Metatile Count
Team Aqua's Hideout edited this page 2024-11-10 17:45:33 -05:00
Table of Contents

Here in this tutorial we will increase the cap for metatiles from 1024 to 4096 by removing the redundant collision bit and decreasing the possible elevations from 16 to 8. You can also get 2048 metatiles with just the unused collision bit, without affecting elevation, the process would be largely the same as described here with some small changes:

Why Would I Want This:

Increasing the metatile cap is pretty self explanatory for some but many people have asked exactly what that means for them so I will be clear here for anyone confused, skip if you understand already. Normally when you're creating a map you have access to 512 metatiles from each tileset (in pokeemerald at least) adding up to 1024 total metatiles you can use. Metatiles are the 16x16 tiles that you actually place down in porymap, made up of 3 layers of 4 8x8 tiles from the actual tileset image. This does not increase the size of the tileset, but it does quadruple the number of metatiles that you can create using your tileset which is probably more than you will ever need. Before you could use 512 metatiles per tileset, after these changes you can use 2048.

Code Changes:

Link to Code Changes (branch of TAH pokeemerald fork)

Code Change Screenshots
Screenshot 3 Screenshot 3 Screenshot 3

There are a handful of constants that need to be changed in the fieldmap header files. The bit masks have to be changed so that the metatile id goes from 10 to 12 bits. This is what allows the game to register ids up to 4096. The collision section is reduced to 1 bit because thats all that is ever used. The elevation mask is reduced by 1 bit as well to gain more space. This one isn't required if you're okay with 2048 metatiles, but other parts of this tutorial will differ if you don't. The other changes found in the link are to change the metatile count constants to 2048 for primary and 4096 for total count, and then to change a couple of values in event_object_movement.c from 15 to 7 which is the new elevation max. This needs to be done so that the crossed arrows elevation used for bridges is now updated to the new max, which is now 7.

Porymap Changes:

After changing this stuff some updates will need to be made in Porymap, to only use 8 elevations you will want to change the elevation image to collisions.png this new one, and change the max elevation number to 7 which you can do in Porymaps settings here:

image collisions

Python Script to Update Existing Maps

With the constants updated and the settings changed in porymap, after reloading you will be able to use 4096 metatiles in your maps. However, you may notice that every single map you have made is broken. This is normal, the binary map data needs to be converted into the new format so porymap can properly recognize it. For that there is a python script in the repo Found Here. This script when in the main pokeemerald folder of your project is ran using:

python3 expand_metatiles.py

If you do not have python installed you will need to install it. After running this script all your maps should be converted into the new format. If you used any elevations greater than 6 in your maps those areas will be the wrong elevation and will need to be fixed but 99% of maps don't use any above 5 so that shouldn't be a common issue, Mossdeep is affected in vanilla but idk about anywhere else. Anyway, reload porymap and your maps should be back to normal again. If you did not get rid of the elevation bit, you will have to make changes to the Python program so that the new elevation bitmask is four bits instead of three like it is currently.

Metatile Labels

All the metatile labels for secondary tileset metatiles that you have created will have to be updated. There is a very easy way to do this though. Just open include/constants/metatile_labels.h and do a Find and Replace for 0x2 with 0x8 and then another for 0x3 with 0x9. This should convert all the vanilla metatile labels into the new ranges.

Porytiles Compatibility:

As is tradition for Porytiles, documentation will be left as an exercise for the reader... Here is what Lucas had to say about it:

image

Credits

  • Tutorial by Archie (with help from GriffinR and inspired by Dragonfly)
  • Python Script by Archie and ChatGPT for lazy boilerplate
  • Porymap Compatibility Already Existed From The Awesome Dev Team

Contact

If you have questions or problems with the branch join the TAH Discord and ping me in the #romhacking-help channel for help: https://discord.gg/hX3a63RYzZ

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