tree 0a5ee9ee8008956a7e08a590ed538a144477d3db
parent cadc011c671409376088e97e7ad2c81a86ab1e73
author Chip Davis <cdavis@codeweavers.com> 1600387481 -0500
committer Chip Davis <cdavis@codeweavers.com> 1600722096 -0500

MVKImage: Handle VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT.

Only set `MTLTextureUsagePixelFormatView` if this bit is set. This
should reduce the usage of this bit, which disables lossless compression
on Apple GPUs, in many cases.

We continue to set it anyway for `VK_IMAGE_USAGE_TRANSFER_SRC_BIT`; this
is because we create those texture views on the application's behalf, to
implement `vkCopyImage()` where the source and destination formats do
not agree. We also continue to set it for depth/stencil formats; Metal
requires it in order to use only the stencil aspect in a view.