So it is usable at 4-6fps. According to the logs
posted, the new driver supports dxt1 compression so it should be possible to use the compressed cache. I have no way to download a pi image at the moment and play around but it sounds promising.
I can only say maybe my work to make the bcmhost driver working is wasted but it's no big deal. In any case, I was getting 25-30fps for zooming and panning at 1280x800. This is much more fluid than 4-6fps For vector charts cm93, is panning 15fps but zooming much slower.
There are also reports that the pi consumes lots of power using this new driver when it's working so much that they had to increase their voltage.
How much power does it use exactly when you are really panning or zooming? What about compared to without opengl? I can measure how much power my pi is using to compare it.
The new driver must do a lot of work on the cpu that was before offloaded to the video core
. The driver makes use of the 3d cores, but not the video core
which is wasted, and therefore this opensource driver will always be inferior in speed, resources and power consumption
to the closed driver unless the video core can be used unfortunately.
As far as I know, only myself and dave have successfully run opencpn
using the closed driver with success. There is an issue also for now with stability which will get solved
automatically by other future changes.