tree e5e73d5bf1e598f9457176f3c1cd921c7d57af75
parent 86e74e0dc1c90574b4caf045ba97575d4012784e
author David 'Digit' Turner <digit@google.com> 1568110048 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1568110048 +0000

[fuchsia] Implement external semaphore and memory support.

This CL adds Fuchsia-specific implementations to the following
classes:

  dawn_native::vulkan::external_memory::Service
  dawn_native::vulkan::external_semaphore::Service

The implementation is based on two Fuchsia Vulkan extensions
that are provides by the vulkan_fuchsia_extras.h header (i.e.
are not upstreamed to Khronos yet, but used/provided by the
Fuchsia platform):

  VK_FUCHSIA_external_memory
  VK_FUCHSIA_external_semaphore

Their details are similar to VK_KHR_external_XXXX_fd, but
uses Zircon handles instead of file decriptors.

BUG=dawn:221
Change-Id: I48238bcf3193433970cbe200a84b86a67103a2f2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/10963
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: David Turner <digit@google.com>