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General purpose game editor made in Game Maker Studio 2
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.github/ISSUE_TEMPLATE Update issue templates Jul 25, 2019
datafiles_yy/data set up the vertex index thing, although it doesn't work yet Nov 17, 2019
notes smf meshes can be imported through the mesh importer, but they have s… Oct 15, 2019
rooms/editor fixed the part where messing with the view code made the UI weird, i … Aug 30, 2019
shaders bounding box shader for single selections Nov 17, 2019
views restructured the save / load code, so that data and asset files are r… Nov 18, 2019
.gitattributes meshes ui works again; also initialized git lfs because i didnt reali… Sep 1, 2019
.gitignore github was bothering me about doing this Jun 13, 2019 added a new rule to Oct 5, 2019
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LICENSE Initial commit May 7, 2019


I have it in my head that making a general-purpose game editor will save me time in the long run, as opposed to falling into the trap of this, which it almost certainly already has. But on the other hand, I've had fun working on this, so maybe that's okay.

The design of this editor borrows a lot from RPG Maker, although there are a number of places where it obviously deviates (all events are functionally Common Events) and some stuff that's totally new (3D meshes vs tiles only).


The main game editor: you can slap down entities of different types (characters, tiles, models, some other things). You can modify their properties, give them behaviors and some other things. (Click to expand the images.)

There's also a 2D mode if you're into that kind of thing, although the underling code is almost exactly the same.

Game data types can be created. Some generic stuff like "sound effects and music" is built-in, but anything that's specific to your particular game has to be defined first.

Once the custom data types are defined, you can assign values to them.

And then there's the event editor. It's essentially just a nodal version of the RPG Maker event editor. It took a lot of work to make but it works pretty well, and I'm happy with how it came out.

There are some miscellaneous property editor form UI things.

A long time ago I made a 3D terrain editor for Game Maker (two of them, in fact). It's not directly related to the rest of DDD but it uses a lot of the same code, the renderer, etc so when someone asked me to re-make it recently I decided to include it.

Upcoming stuff

  • Autotiles (for both 2D tiles and 3D meshes)
  • More map stuff, verticality, camera controls
  • Certain data structures inside the editor are garbage so i'm going to spend a bit of time refactoring
  • Off-grid map editing (both in 2D and in 3D) - although the main grid-based functionality will obviously take priority

Stuff I'm considering adding

Obviously I want to fully implement and / or expand a lot of the things that are already included, but there are also a few completely new things that I want to get to eventually that aren't part of the program yet.

  • UI blueprints: they won't be fully scriptable or anything, but they should make laying out menus and whatnot in-game easier than they otherwise would be
  • Proper documentation (beyond the tooltips)

How development for this works

For the time being, I'm compiling updates once a week or so, or perhaps more often if I find a bug that breaks things entirely. If I don't have much to add at the end of a given week I might skip one, or if I finish off something major I might release it as soon as it's done. The versioning system I'll be using goes, so 2019.4.3.22 would be the third release in the fourth quarter of 2019, and the twenty-second time overall I created an executable.

Unless something seriously bad happens and I'm not able to make the Yoyo Compiler work, there will be two versions: one with the regular Game Maker interpreter ("default"), and one made from the Yoyo Compiler ("yyc"). The interpreted version will be somewhat slower but should be more stable, and the YYC version will be faster but potentially buggier.

I've learned the hard way that having large amounts of bad code inevitably makes it really hard to develop a project, which means I refactor things fairly frequently. As a result, things that used to work break from time to time. If you're using this, that means you want to save your work and save backups frequently - there's an Automatic Backups setting in Preferences, as well as a button that lets you view the folder they're stored in.

In addition, the data format evolves over time. For the most part the editor is backwards compatible and will be quite happy to read old version of the data files, but to fend off the aforementioned code rot I kill off old versions periodically (now that I'm publishing releases, I'll probably be doing that once a quarter or so). I'll say when I put out an update that kills compatibility, and if you try to load an old data file the editor will tell you and ask you to save it through a more recent version that it will accept.


The game I'm making in tandem with this editor (and using this editor) is currently in a private repository so you can't look at that to see how you use the data files, although the serialize_load_* scripts should give you a good idea of how the data's stored. Except for game maps and a few places where a number of related bools are smashed together into an int32 it's mostly just a bunch of data types stored in sequence.


Original project

The original GMS1 repository can be found here, but I won't be updating it in the future because GMS2 is really good and I don't plan on going back.

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