This is required in order to make meta copies work between images
that do not have the necessary D3D11 bind flags set, and it may
speed things up because it allows rendering to the destination
image directly rather than requiring a temporary image.
Since the bind flags of the texture may not always match the
image usage flags of the underlying Vulkan image, we should
use the latter to check whether a view can be created.
This may prevent driver crashes and give more useful debugging info
in case a given combination of image parameters is not supported by
a device. May also improve compatibility with direct image mapping.
Not having to wait for an image->buffer copy to finish on the
GPU allows for more efficient synchronization. Significantly
improves performance in The Witcher 3.
Image mapping now returns the map pointer of a separate
buffer, rather than the the image itself. This fixes
issues with applications that ignore the RowPitch
and/or DepthPitch fields of the MappedSubresource struct.
This is required because in D3D11, typeless formats can be used
to create both depth and stencil images, and color formats can
be used to view depth images. In Vulkan, images and views that
are used as depth-stencil attachments will have to be created
with a depth-stencil format, so we have to take the image's
bind flags into account when picking a format.
