tree eaa7b264186b54bd65b8c41689f38fdcf98c746b
parent 790b7aa594be171117da4be9ce73e4d2021b88f9
author Bill Hollings <bill.hollings@brenwill.com> 1651780526 -0400
committer Bill Hollings <bill.hollings@brenwill.com> 1651780526 -0400

Add support for VK_KHR_separate_depth_stencil_layouts extension.

Add VK_KHR_separate_depth_stencil_layouts and enable its features.
Metal generally ignores image layouts, so nothing further needed.
Update Whats_New.md and MoltenVK_Runtime_UserGuide.md documents
with recently-added extensions.

Passes almost all supported separate_layouts CTS tests, with the
few remaining tests failing due to issues with unrelated capabilities.

Unrelated cleanup:
- MVKDevice enable extensions before features.
- MVKDevice reorder ivar declarations to reduce
  memory layout gaps, and define default values.
- Rename VkSemaphoreStyle to MVKSemaphoreStyle to
  remove potential conflicts with Vulkan Vk name space.