This is the heap representing system memory. The memory type
corresponding to `MTLStorageModeShared` is reported as belonging to this
heap.
I've tried to correct the reported size of the heaps as well while I'm
at it. UMA GPUs and the system heap for NUMA GPUs use the system memory
size as the heap size, and the amount of available memory as the budget.
iOS 13 uses the new `os_proc_available_memory()` API for this purpose.
NUMA GPUs additionally use the memory used by the process as a crude
measure of system heap usage.
Largely minimal for now. Much of it, particularly most of the
interactions with `VK_KHR_swapchain`, was already implemented
previously. The only interesting bits are the `vkCmdDispatchBase()`
command, and the ability to create arbitrary swapchain images and bind
them to swapchain memory, which requires the use of the previously
implemented `VK_KHR_bind_memory2` extension. Most everything else can be
safely ignored for now.
Non-zero dispatch bases use the compute stage-input region to pass the
dispatch base group to the shader, which must manually adjust the
`WorkgroupId` and `GlobalInvocationId` builtins, since Metal does not do
this for us. I have tested that this approach works well--at least, well
enough to pass the CTS.
Because of the ability to bind arbitrary images to swapchain memory,
I've sucked the guts out of `MVKSwapchainImage` and into `MVKSwapchain`
itself. Availability and drawable management is now performed by the
swapchain object. `MVKSwapchainImage` is now just a specialized kind of
image, created when requested with a `VkImageCreateSwapchainInfoKHR`
structure.
Update SPIRV-Cross so we can support the `vkCmdDispatchBase()` command.
One more step towards Vulkan 1.1.
All Apple GPUs support this, as does Mac GPU family 2. With this, we can
avoid expensive copies between buffers and textures allocated from the
same memory, and reduce memory usage to boot.
macOS is, unfortunately, constrained by the fact that `MTLHeap` objects
do not support any storage mode other than `MTLStorageModePrivate`--not
even `MTLStorageModeManaged`. This won't help for managed textures
there. Perhaps Apple will fix this in a later version.
The old `DCI_P3_LINEAR` enum is deprecated. Use
`VK_COLOR_SPACE_DISPLAY_P3_LINEAR_EXT` instead. This is a closer match
for the Core Graphics name anyhow.
Set the `opaque` property of the `CAMetalLayer` based on this. In the
past, we did nothing; this actually corresponds to
`VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR`.
Drop support for premultiplied alpha. In Core Animation, this is managed
by the `contents` of the layer. Most layers use a `CGImage` or an
`NSImage` for their contents; the `AlphaInfo` property of a `CGImage`
determines whether or not it uses premultiplied alpha. However,
`CAMetalLayer` doesn't use a `CGImage`, but a custom opaque Core
Foundation object which ostensibly vends images to be displayed by the
layer. I don't know which kind of alpha it uses, but since most
applications render postmultiplied colors I'm going to assume that
premultiplied alpha isn't supported yet.
Add MVKEvent class. MVKEventNative subclass uses native MTLEvent. MVKEventEmulated
subclass uses emulation using CPU blocking and MTLCommandBuffer completion handling.
MVKConfiguration::synchronousQueueSubmits now disabled by default if MTLEvents are not supported.
Document updated use of MVK_ALLOW_METAL_EVENTS and MVK_CONFIG_SYNCHRONOUS_QUEUE_SUBMITS
environment variables and synchronousQueueSubmits config setting, in vk_mvk_moltenvk.h.
When available, use it instead of doing it manually in the shaders.
Unfortunately, it's only available on Apple GPU family 4 and up, and
desktop GPU family 2. Should still provide a nice boost.
Mac-only for now. Mostly because I don't know which formats beyond DXTn
and ASTC support 3D textures. Also, the extension to support 3D ASTC
compression isn't ready yet.
This extension requires macOS 10.15. For some reason, even though
Apple said that the new Apple TV supports HDR10 and DolbyVision, the
`CAEDRMetadata` type underlying this is not supported on either iOS or
tvOS.
Also set the `wantsExtendedDynamicRangeContent` property on macOS to
enable HDR output. It's not only set if HDR metadata is attached, but
also if an HDR color space is selected.
MVKDevice check highest queue family index before expanding queue family collection.
MVKVector add bounds check to at(), [], front() & back() functions.
MVKDispatchableVulkanAPIObject::getVkHandle() re-establishes the loader magic number
before returning, in case the loader overwrote it before returning the object.
