pandemonium_engine/platform/frt/doc/VC4.md

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VC4
===
Used on Pis 0-3 and very well documented.
There are two drivers for it: an open-source one (vc4) and a closed-source,
legacy one (bcm).
## New Driver (vc4)
As of today, users have to enable it manually on Raspbian,
Usually, too slow to be used on Pis 0-1.
Very good integration with the Linux standard ecosystem, both X11 and KMS/DRM.
## Legacy Driver (bcm)
As of today, the default driver on Raspbian.
The only realistic option for Pis 0-1: it uses a coprocessor (other than the
main CPU and the main 3D core), and so it can offload some of the work from
the CPU.
No interaction with the X11 desktop.
## Known Limitations
- 3D on Godot 3.x only works with the vc4 driver.
- 2D particles on Godot 3.x don't work.