ASSIGNED 214392
[WebGL2] tex-srgb-mipmap test fails on macOS Intel + iOS (but passes on macOS Apple Silicon) 
https://bugs.webkit.org/show_bug.cgi?id=214392
Summary [WebGL2] tex-srgb-mipmap test fails on macOS Intel + iOS (but passes on macOS...
Dean Jackson
Reported 2020-07-15 19:48:00 PDT
The test webgl/2.0.0/conformance2/textures/misc/tex-srgb-mipmap.html is failing on: - macOS Intel (AMD) (didn't check Intel) - iOS (hardware) But passing on: - macOS Apple Silicon It also has different results on iOS Simulator (still failing, just different pixel colour values)
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Radar WebKit Bug Importer
Comment 1 2020-07-15 19:48:15 PDT
<rdar://problem/65641438>
Kenneth Russell
Comment 2 2020-07-16 12:49:24 PDT
Comparing the results of the 2.0.0 snapshot: https://www.khronos.org/registry/webgl/conformance-suites/2.0.0/conformance2/textures/misc/tex-srgb-mipmap.html to top-of-tree: https://www.khronos.org/registry/webgl/sdk/tests/conformance2/textures/misc/tex-srgb-mipmap.html the 2.0.0 version fails in Chrome Canary on macOS but the top-of-tree version passes. If I remember correctly, Intel contributed this test and workarounds for driver bugs where mipmaps for sRGB textures weren't generated correctly. I've just filed: Workarounds for sRGB mipmap generation needed on macOS https://bugs.chromium.org/p/angleproject/issues/detail?id=4848 about this. Khronos' 2.0.0 snapshot of this test also needs to be updated, and rolled forward in WebKit too.
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