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They have independent 3D drivers ("vc4" vs "v3d"), although they share the DRM/KMS compositing side. OpenGL calls are processed by libmesa and farmed off to the appropriate driver for the platform.Fidelius wrote: ↑Tue Jun 25, 2019 8:00 amIt works on the Pi3, but is visibly slower with Raspbian Buster than it used to be with Raspbian Stretch, when it comes to OpenGL applications like Hatari, MAME, etc. For example on Hatari it's a 20% slow-down, meaning compared to Stretch there's now frame skips and the emulated sound isn't in sync anymore.
Will Buster's OpenGL slow-down on Videocore4-Pis go away with future versions of the (new) graphics driver, or is this a side-effect of the new graphics driver being optimised for Pi4's Videcore6 ?