Legacy GM Invert Colors With Code

[Lander]

So in my game, I have found one way to invert colors by using the sprites but what I want to do involves lots of objects to do that and makes the game lag. So I was wondering if someone could help me find a way to make code that inverts colors in game maker using code to make the game less laggy

 

[bojack29]

Try looking into shaders, or, you can try layering sprites and using a white sprite for image blending.

 

[zbox]

Shader is the way to go. Very easy to do. Fragment shader, set RGB to 1-R,1-G,1-B.

You can probably even do it with blend modes tbh

 

[Lander]

@zbox and @bojack29 Thank you for the advice I will look into trying out shaders, and see what I can do with that thank you

 

[The Reverend]

The second shader in this video is an inversion shader:

And the playlist is all about learning to work with shaders:
https://www.youtube.com/playlist?list=PL0kTSdIvQNCNE-BDKOlYu628AalMmXy_P