222790 2021-03-05 02:25:17 -0800 WebGL2: Red flickering when using copyTexImage2D() 2021-03-09 00:54:15 -0800 1 1 1 Unclassified WebKit WebGL Safari Technology Preview Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 222964 222812 1 michael.herzog kkinnunen dino ews-watchlist graouts kbr kkinnunen kondapallykalyan kpiddington webkit-bug-importer oldest_to_newest 1736268 0 michael.herzog 2021-03-05 02:25:17 -0800 I've enabled WebGL 2 in Safari Technology Preview Release 121 (Safari 14.2, WebKit 15612.1.4.3) on macOS 10.15.7. Please open https://threejs.org/examples/#webgl_framebuffer_texture The demo renders a scene and then copies a portion of the framebuffer into a texture (via copyTexImage2D()). This texture is then used for a sprite which is rendered at the top-left corner of the screen with an additional render pass. When you now hover with the mouse over the links in the left menu bar, the sprite starts to flicker red. This does not happen when using WebGL1 and not with latest Firefox and Chrome. When using stable Safari (Version 14.0 15610.1.28.1.9, 15610) and WebGL 2, there is only a signle red flicker right when loading the page (but not when hovering links). My system: iMac (Retina 5K, 27'', ultimo 2014) 4 GHz Quad-Core Intel Core i7 16 GB 1600 MHz DDR3 AMD Radeon R9 M295X 4 GB 1736747 1 kbr 2021-03-05 21:09:15 -0800 On my machine (2017 15" MacBook Pro, Intel HD 630 / AMD Radeon 560), the sprite flickers to black while hovering over the links on the left. The texture copying code looks correct - it's doing the copy inside the requestAnimationFrame callback. Otherwise I might have guessed it was relying on undefined behavior, if preserveDrawingBuffer is set to the default false (haven't checked). The behavior is quite strange. I don't know how other rendering work the browser is doing could interfere with the WebGL rendering in this way. Could this have something to do with how the WebGLLayer publishes its textures to the compositor? Kimmo, can you reproduce? 1737037 2 422557 kkinnunen 2021-03-08 05:26:08 -0800 Created attachment 422557 Patch 1737038 3 kkinnunen 2021-03-08 05:28:19 -0800 Red is the uninitialized IOSurface contents visible due to multisample resolve blit erroring out. 1737355 4 422557 kbr 2021-03-08 16:07:17 -0800 Comment on attachment 422557 Patch Looks good. Would you please consider putting up a pull request enhancing the associated tests in the WebGL conformance suite? Please see https://github.com/KhronosGroup/WebGL/issues/3255 . Thanks. r+ 1737498 5 ews-feeder 2021-03-09 00:53:36 -0800 Committed r274141: <https://commits.webkit.org/r274141> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422557. 1737499 6 webkit-bug-importer 2021-03-09 00:54:15 -0800 <rdar://problem/75207365> 422557 2021-03-08 05:26:08 -0800 2021-03-09 00:53:37 -0800 Patch bug-222790-20210308152606.patch text/plain 15947 kkinnunen U3VidmVyc2lvbiBSZXZpc2lvbjogMjc0MDY3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMWIxMzBiMjM3NWY3OWQy Y2E2MDlkNzkxNzYyODBkZjdiMTQzZTZhNy4uY2IzNjZhYzZmNjkwZjYzMDEwNGVjNTZiYTgzMzNl YTg1NTExZjhkZSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI1IEBACisyMDIxLTAzLTA4ICBLaW1t byBLaW5udW5lbiAgPGtraW5udW5lbkBhcHBsZS5jb20+CisKKyAgICAgICAgV2ViR0wyOiBSZWQg ZmxpY2tlcmluZyB3aGVuIHVzaW5nIGNvcHlUZXhJbWFnZTJEKCkKKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIyMjc5MAorCisgICAgICAgIFJldmlld2Vk IGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFJlYWRpbmcgbm9uLWZ1bGwgRkJPIHJlY3Rh 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