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Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The fixedFoveation property of the XRProjectionLayer interface is a number indicating the amount of foveation used by the XR compositor for the layer. Fixed Foveated Rendering (FFR) renders the edges of the eye textures at a lower resolution than the center and reduces the GPU load.
It is most useful for low-contrast textures such as background images, but less for high-contrast ones such as text or detailed images. Authors can adjust the level on a per-frame basis to achieve the best tradeoff between performance and visual quality.
ValueA number between 0 and 1.
It's up to the user agent how to interpret the numbers in this range. When changing the foveation level, the effect will visible in the next XRFrame.
Note that some user agents might implement certain levels of foveation, so you might need to adjust the foveation level in large increments to see an effect. Example levels:
0: no foveation1/3: low foveation2/3: medium foveation1.0: maximum foveationSome devices don't support foveated rendering. In that case fixedFoveation is null and setting it will not do anything.
The fixedFoveation property allows you to set the level of foveation at runtime and for each frame. To set the maximum foveation for a given XRProjectionLayer, use a value of 1.
let glProjectionLayer = glBinding.createProjectionLayer(/* ⦠*/);
glProjectionLayer.fixedFoveation = 1; // maximum foveation
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