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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.