Reftest regression with gfx-backend-metal 0.3.3

[zakorgy]

reftests/split/nested-preserve3d-crash.yaml reftest fails with when running all the reftests (otherwise it passes): REFTEST TEST-UNEXPECTED-FAIL | reftests/split/nested-preserve3d-crash.yaml == reftests/split/nested-preserve3d-crash.yaml | image comparison, max difference: 255, number of differing pixels: 19194. The issue was introduced in f488584114728b5bc7745460442e7fc5df9a7f81, which is a gfx-rs update. The previous version of gfx-backend-metal was 0.2.0. The images from the base64 output: Result:

Reference:

[kvark]

Interesting, thanks for the investigation! Would you be able to provide a Metal GPU capture?

[zakorgy]

11e3f61060c6c83d455e456f2bac4fc1abe4b873 introduced new fails with metal backend:

• [x] reftests/blend/multiply-2.yaml == reftests/blend/multiply-2-ref.yaml
• [x] reftests/blend/difference.yaml == reftests/blend/difference-ref.yaml
• [x] reftests/blend/difference-transparent.yaml == reftests/blend/difference-transparent-ref.yaml
• [x] reftests/blend/darken.yaml == reftests/blend/darken-ref.yaml
• [x] reftests/blend/lighten.yaml == reftests/blend/lighten-ref.yaml
• [x] reftests/blend/repeated-difference.yaml == reftests/blend/repeated-difference-ref.yaml
• [x] reftests/blend/isolated-2.yaml == reftests/blend/isolated-2-ref.yaml
• [x] reftests/filters/filter-mix-blend-mode.yaml == reftests/filters/filter-mix-blend-mode-ref.yaml

these are blending related

[zakorgy]

The fails in https://github.com/szeged/webrender/issues/309#issuecomment-542669184 were fixed in #323 and the fails in https://github.com/szeged/webrender/issues/309#issue-491595364 seems to be absent with our latest version (c9a99e4f3b2397cbd3fe59159d572bf5a91ba895).