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I'm using vc_dispmanx as a display engine and noticed the presence of vc_vchi_dispmanx library who looks quite close to vc_dispmanx.
Dispmanx seems to be a broadcom proprietary alternative to openGL, SDL, OpenMax, and so on ... It's a C library used in program such as raspivid/raspistill or pngview.
What is the difference / When should we use vc_vchi_dispmanx ?
I found more information at balena.
VCHIQ means Video Core Host Interface Queue and allows to communicate with the GPU through a kernel module/driver.
vc_dispmanxandvc_vchi_dispmanx? On my default Raspbian installation I cannot find any `*dispmanx* on the system and in the default repository. – Ingo May 18 at 8:51/opt/vc/includeyou'll find reference to this stuff. @T.t You might have a look at some of this: elinux.org/Raspberry_Pi_VideoCore_APIs At a glance dispmanx is a (being depreciated) windowing system, vhci is I think a broader umbrella interface to the GPU. I.e., one is not equivalent to the other; OGL, SDL, and openMax do not serve equivalent purposes either, although there may be some overlapping ones between them. – goldilocks♦ May 18 at 18:50