Drastically limits the amount of descriptor memory we allocate in situations
where an application renders without presenting anything to a swap chain.
The new limit is a bit tight for some real-world use cases (e.g. Ashes of the Singularity),
but at worst we will start calling vkAllocateDescriptorSets once per set and draw.
Avoids pointer dereferencing on a really hot code path. This is also
safe since there's a 1:1 mapping between the VkPipelineLayout and the
given ovbject type.
With this new approach, descriptor pools are decoupled from the
command list they are used with. Instead, the DXVK context takes
ownership of a single descriptor pool until it runs out of memory.
This reduces the amount of memory wasted for under-utilized pools
and should this reduce an application's memory footprint.
Fixes a few bottlenecks that were encountered in the Cascading Shadow
Maps demo from the Microsoft SDK. Performance is now slightly better
than wined3d with CSMT, MESA_NO_ERROR and mesa_glthread enabled.
Philip Rebohle
Jacek Caban