I change UI_draw_roundbox_gl_mode to use immediate API. The rest of the change is the call to the function. I also make some change in UI_ThemeColor4(int colorid) for eg to make convenience to use. I would really like to know if it's the good way to do, if yes I will make all the change in the node_daw.c after, else say me what's wrong and how to deal with color else. Reviewers: merwin, dfelinto, Severin Reviewed By: merwin Subscribers: fablefox, Severin Tags: #bf_blender_2.8, #opengl_gfx Maniphest Tasks: T49043 Differential Revision: https://developer.blender.org/D2274