202835 2019-10-10 17:47:08 -0700 Support eGPUs correctly in ANGLE backend 2022-06-30 16:39:24 -0700 1 1 1 Unclassified WebKit WebGL WebKit Nightly Build Unspecified Unspecified RESOLVED CONFIGURATION CHANGED P2 Normal --- 198948 1 kbr webkit-unassigned bfulgham dino hypertree jdarpinian justin_fan oldest_to_newest 1578929 0 kbr 2019-10-10 17:47:08 -0700 WebKit's current WebGL implementation supports external GPUs (eGPUs) correctly, specifically when the browser window is moved from one screen to another driven by an eGPU. ANGLE doesn't currently contain the code required to let this work correctly (the associated CGLSetVirtualScreen calls, and others). Investigation will be needed to understand how exactly to make this work. For example, should WebKit's code continue to register a CGDisplayRegisterReconfigurationCallback, and call into ANGLE via some new extension so ANGLE can set the CGL renderer ID of its internal CGLContextObj? This is a blocker to switching to the ANGLE backend - it would be unfortunate to regress support for eGPUs. 1653261 1 hypertree 2020-05-15 18:52:00 -0700 This seems like biggest blocker in switching to ANGLE. Any update ? 1653718 2 jdarpinian 2020-05-18 12:59:41 -0700 We should test this, but I believe it is fixed already. CGLSetVirtualScreen is called outside of ANGLE, in the same place as in the non-ANGLE path (GraphicsContextGLOpenGLCocoa.mm). 1879581 3 bfulgham 2022-06-30 16:39:24 -0700 We believe this is fixed in modern Apple platforms.