[1.14-1.15] Screen and openGL

[matt1999rd]

Hello everyone,

I am a total beginner in display code and I want in my new mode to fill a square of a screen with a color that is saved in my screen field. I try to use AbstractGui#fill but it seems not to work. I have seen many time the instance Tesselator that was used but I don't see what this do and how I should use it. In the same idea openGL is used backward and I would like to know where I can find tutorial to understand basic functionnalities of this software.

Here is the Screen I want to implement it looks alike the one in ichttt mod because I want to implement something of this kind with more options : https://github.com/matt1999rd/SignMod/blob/master/src/main/java/fr/mattmouss/signs/gui/DrawingScreen.java

[matt1999rd]

I solve this issues myself and I forget the alpha layer. However I really wander what Tesselator use and how I can use it in TER or gui ?