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I have a working program that creates an EGL window and then renders into it using OpenGL ES on Raspberry Pi 4. I can control the size of the window but the position on the screen is random every time. I need to be able to control the position on the screen.

I've read that it can be done with subsarfaces and I looked at the clients/subsurfaces.c example but wasn't able to make sense of it.

I attached egl.c file where I'm initializing both Wayland and EGL and it contains all the important bits.

I tried a few experiments with creating a second surface, making it a subsurface and then creating the EGL window from that subsurface but then nothing ever showed up on the screen.

Any help would be much appreciated.

egl.c