- To force any incomplete CAMetalDrawable presentations to complete,
don't force the creation of another transient drawable, as this can
stall the creation of future drawables. Instead, when a swapchain
is destroyed, or replaced by a new swapchain, set the CAMetalLayer
drawableSize, which will force presentation completion.
- Add presentation completion handler in command buffer scheduling
callback, move marking available to presentation completion handler,
and minimize mutex locking.
- MVKQueue::waitIdle() remove wait for swapchain presentations,
and remove callbacks to MVKQueue from drawable completions.
- MVKQueue::submit() don't bypass submitting a misconfigured submission,
so that semaphores and fences will be signalled, and ensure misconfigured
submissions are well behaved.
- Add MVKSwapchain::getCAMetalLayer() to streamline layer access (unrelated).
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