tree 857567ed8a271051444e89a673e1a64a86c8b04d
parent 645a8dea641aae363ee9e47fa7fcb9c930312365
author Nicolas Capens <capn@google.com> 1569357988 -0500
committer Nicolas Capens <nicolascapens@google.com> 1569358442 +0000

Fix WSI present on MacOS

As documented at https://developer.apple.com/documentation/quartzcore/cametallayer/1478168-framebufferonly:
"If the value is true (the default), the CAMetalLayer class allocates
its MTLTexture objects in ways that are optimized for display purposes.
However, you may not sample, read from, or write to those textures. To
support sampling and pixel read/write operations on the layer’s textures
(at a cost to performance), set this value to false."

Since we call replaceRegion in MacOSSurfaceMVK::present() to write pixels
from system memory, we need to set this flag to false explicitly.

Bug: b/137673628
Change-Id: I83e28a2940261d9eedf30d7c96427c23d85ac639
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/36608
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>