On Mon, 11 Aug 2014 17:35:31 +0200 Daniel Vetter daniel@ffwll.ch wrote:
Well for other drivers/stacks we'd fall back to GL compositing. pixman would obviously be terribly. Curious question: Can you provoke the hw/firmware to render into abitrary buffers or does it only work together with real display outputs?
Since we have been talking about on-line (direct to output) and off-line (buffer target) use of the HVS (2D compositing engine), it should be able to do both I think.
So I guess the real question is: What kind of interface does videocore provide? Note that kms framebuffers are super-flexible and you're freee to add your own ioctl for special framebuffers which are rendered live by the vc. So that might be a possible way to expose this if you can't tell the vc which buffers to render into explicitly.
Right. I don't know the HVS details yet, but I'm hoping we can tell it to render into a custom buffer, like the 3D core can.
This discussion is very helpful btw, I'm starting to see some possible plans.
Thanks, pq