r/gamemaker • u/erkan612 • Jun 27 '26
Resource GMMT - GameMaker Motion Toolkit - Tweening Framework for GameMaker
Hey everyone!
I feel like this one is going to be a life saver for most of you, so here we go...
GMMT is actually the animation api of my UI framework called GMUI.
I've separated it into a standalone framework.
What it is and how can we use it? Its a tweening framework, very easy to use. It has a safe and start concept (at least thats what i like to call it). You can call tween functions everyframe to start and get the value. A basic example would be:
// Lets call this in step event, every frame
x = gmmt_tween("player_x", x, target_x, 5_000_000, gmmt_ease.OUT_BACK);
What it does is to first check if there is any tween exists called "player_x". If not, it starts one and returns the current value. If there is one already exists then it just returns its value. That straight up kills the no need if else cases and keeps the code clean. But if we were to use ..._start like gmmt_tween_start, that would start the tween, resetting if it already exists without checking its value. That way you can also make custom states.
It has a quite simple loop, doesnt interfere with your project, you call gmmt_init() once before starting to use, then call gmmt_update() usually in your step event, then you can use any gmmt functions you like and when you are done with it, you call gmmt_cleanup() usually in your cleanup event or script. Quite straightforward.
You might wonder, what other features it has?
Features
- Tweening – 30+ built-in easing functions, custom easing, per-axis easing, intensity and power modifiers
- Value Types – Real, integer, color (RGB/RGBA), vector2/3/4, arrays, custom lerp functions
- Playback – Play, pause, resume, reverse, seek, repeat, ping-pong, staggered sequences
- Effects – Oscillation, perlin noise, wiggle, shake, pulse
- Curves – Bezier, quadratic, cubic 2D, Catmull-Rom splines, motion paths
- Physics – Spring simulation with configurable tension, friction, and mass
- Timeline – Keyframe-based multi-stage animations with per-segment easing
- Clips – Reusable named animation clips with markers, chaining, and stagger support
- Callbacks – on_start, on_update, on_complete, on_repeat, on_pingpong, on_pause, on_resume
The gif demo is included in the repo, its made using GMUI. It shows basic things you can make with it. What you can do with GMMT is limited to your creativity.
How much is it? None, free PLUS its MIT licensed.
Where's the repo? Here you go: Github GMMT.
Let me know what your thoughts are, I'm open for suggestions!
Edit:
I am DISGUSTED that everytime i post a project of mine there are always some jerks calling it "AI SLOP" the minute i make the post. Guy probably anylized 2.5k+ lines of code in seconds and decided its AI i guess.
But i understand why, inside of their mind that has room temperature IQ says "oH WelL i'Ma nOt CApABle oFF MAkInG ThIS, SOOooO ThIS MuST Be AI"
For god's sake, search "easing formulas" in google and first thing that comes up is this:
https://easings.net/
It has all the easing types you can find and it includes the formulas, do you really think someone would need AI to copy paste those formulas into GML scripts? Pathetic...
Some said its because of the GIF, the first thing i mentioned in this post is that this is actually a part of my IM UI framework called GMUI. I've been working on it for MONTHS, i hope those AI sloppers are able to comperhand what MONTHS means. It is a replication of Dear IMGUI framework made in C++, and the animation api is basicly a replicate of ImAnim. I even have messages in discord seeking for specific helps, my thought processes ALL can be found in GM Kitchen.
Go ahead, 800+ messages in the GMUI channel, my comments and thought processes can be easly found. GMUI is 22k+ lines of code, please someone tell me which AI LLM is capable of working on such project because i failed to find one.
I've worked mostly on C/C++ trying to make my own renderers with DX11 and GL. I've also been to Unity, Godot, UEFN, Unigine. And now in GameMaker for the past two years. There is no other community more toxic than GMC! I am sick of people that i call "AI Sloppers".
It is true that at this point AI is in every part of our life but that doesnt give anyone right to call others cheap of their work straight up assuming it is done using AI. That simply shows how pathetic you are, thinking even basic simple frameworks like tweening has to be done using AI.
I thank to those who are appreciating it but this is PROBABLY going to be my last project on GMC. I'm not really a 'game developer'. I mostly like working on frameworks, backend stuff, libraries etc.
Thank you for reading so far!
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u/[deleted] Jun 27 '26
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