LVGL V8 has gpu_fill_cb function?

How-to
1

I can’t find the gpu_fill_cb function in LVGL V8, is it not supported anymore?
Is there any way to replace it?

2

In v8 we have more sophisticated system for GPU support.
See Add custom GPU — LVGL documentation

3

I see a project, render lvgl to OpenGL ES, with the help of SDL.
rainlab-inc/lvgl-opengl: OpenGL ES 2.0 Implementation of LVGL (github.com)

If get rid of SDL, that’s better.