tree b16d0a9e655da10ef8d6e70e346703e17f371651
parent d9152cb949c9b3e6a7e9261a231fbad4f0165912
author Iago Toral Quiroga <itoral@igalia.com> 1584095706 +0100
committer Marge Bot <eric+marge@anholt.net> 1602624088 +0000

v3dv: support submits without a command buffer

It is valid to submit with an empty list ofcommand buffers, however,
we still need to wait on the pWaitSemaphores provided and only signal
the pSignalSemaphores and fence once we have finished waiting on them
to honor the semantics of the submission.

Because waiting and signaling happens in the kernel, the easiest way
to do this is to submit a trivial no-op job to the GPU. To do this,
we need to refactor some of our code so that code that might have been
operating on a command buffer starts operating on a job instead, so we
can resuse most of our infrastructure to create the no-op job.

Additionally, because no-op jobs are created internally by the driver,
we are responsible for destroying them too. For this, we bind a fence
to each no-op job we submit and we test for completion of in-flight
no-op jobs (and destory them if completed) every time vkQueueSubmit
is called.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>