Hi,
I have a custom system/gfx driver that is working fine for single-app use.
To date I've not supported multi-app - but that may now be a requirement.
I was looking for pointers on how/what is required for this.
First I will outline my understanding of how multi-app works.
Each user (process) instance of dfb has its own system/gfxdriver backend.
In a multi-app build, the first instance becomes the master instance and
all subsequent become slaves.
If we consider a normal system/gfxdriver set up -
- each instance maps the whole framebuffer into its own process
space.
- each instance has its own set of MMIO registers of accelerated
graphic ops.
- allocations of surfaces are marshalled via the master instance.
- any instance can directly issue *software* operations.
- any instance can directly issue *hardware* operations, but
synchronisation/exclusive access to the hardware is marshalled.
- the layer providing the shared memory, locking, calls back to
master etc is the Fusion library.
Is that a reasonable summary?
For my implementation, I'd like to have each instance issue accelerated
graphic ops via the master instance - i.e. via a call through Fusion. (my
implementation doesn't use MMIO).
Is that viable - can I just have my gfxdriver punt calls through the Fusion
layer - are there any existing gfxdrivers that do this?
Regards,
Jason Barstow.
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