Graphics: Mesa, DRM and WebXR
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More NIR Optimizations En Route, "Soft FP64" Still Being Worked On
When it comes to letdowns for Mesa in 2018, sadly OpenGL 4.6 support didn't reach mainline. Another unfortunate feature not making it into the Mesa 18.x release series is the "soft FP64" support to allow some older GPUs to work with OpenGL 4.x. While we haven't seen any new soft FP64 patches in a while, not all hope is lost.
It's been a while since any exciting soft FP64 work was presented, but this work is notable in it will let AMD Evergreen GPUs expose OpenGL 4.3 with the open-source driver stack. This FP64 emulation support will also help out older Intel and NVIDIA (via Nouveau) GPUs as well that lack native hardware double precision floating point capabilities.
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More DRM Changes Queued Ahead Of Linux 4.21
Another batch of drm-misc-next changes has been staged ahead of the Linux 4.21 kernel merge window that will open at the end of December or early January.
This latest round of drm-misc-next code includes more core changes as well as changes to the smaller Direct Rendering Manager drivers that don't otherwise send in their own pull requests direct to DRM-Next.
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Mozilla VR Blog: Updating the WebXR Viewer for iOS 12 / ARKit 2.0
Last year, we created an experimental version of an API for WebXR and built the WebXR Viewer iOS app to allow ourselves and others to experiment with WebXR on iOS using ARKit. In the near future, the WebXR Device API will be finalized and implementations will be begin to appear; we're already working on a new Javascript library that allows the WebXR Viewer to expose the new API, and expect to ship an update with the official API shortly after the webxr polyfill is updated to match the final API.
We recently released an update to the WebXR Viewer that that fixes some small bugs and updates the app to iOS 12 and ARKit 2.0 (we haven't exposed all of ARKit 2.0 yet, but expect to over the next coming months). Beyond just bug fixes, two features of the new app highlight interesting questions for WebXR related to privacy, friction and platform independence.
First, Web browsers can decrease friction for users moving from one AR experience to another by managing the underlying platform efficiently and not shutting it down completely between sessions, but care needs to be taken to not to expose data to applications that might surprise users.
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