How can we expose foveation?

[cabanier]

OpenXR exports a swapchain that has a "density map". This is consumed by Vulkan to enable dynamic foveation

/face2face

[AdaRoseCannon]

/facetoface

(also do we need another joint with WebGPU)

[cabanier]

Eventually yes but this would be mostly how we expose this in WebXR.