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Merged
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Jun 26, 2020
Merged

Allow caching various objects (take 2) #1088

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24b3303
Allow caching XRViewport objects
Manishearth Jun 18, 2020
deb6236
Allow caching XRFrames
Manishearth Jun 18, 2020
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Allow caching XRFrames
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@Manishearth
Manishearth committed Jun 26, 2020
commit deb62365e284d5192efb577565ed5eae26bfa15e
8 changes: 7 additions & 1 deletion index.bs
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Expand Up @@ -940,7 +940,13 @@ NOTE: The <a href="https://immersive-web.github.io/layers">WebXR layers module</
When an {{XRSession}} |session| receives updated [=viewer=] state for timestamp |frameTime| from the [=XRSession/XR device=], it runs an <dfn>XR animation frame</dfn>, which MUST run the following steps regardless of if the [=list of animation frame callbacks=] is empty or not:

1. Let |now| be the [=current high resolution time=].
1. Let |frame| be a [=new=] {{XRFrame}} with [=XRFrame/time=] |frameTime| and {{XRFrame/session}} |session| in the [=relevant realm=] of |session|.
1. Initialize |frame| as follows:
<dl class="switch">
<dt>If |session| has previously run an [=XR animation frame=], the user agent MUST:</dt>
<dd>Let |frame| be the same {{XRFrame}} object created by the earlier [=XR animation frame=]</dd>
<dt>Otherwise:</dt>
<dd>Let |frame| be a [=new=] {{XRFrame}} with [=XRFrame/time=] |frameTime| and {{XRFrame/session}} |session| in the [=relevant realm=] of |session|.</dd>
</dl>
1. If |session|'s [=pending render state=] is not <code>null</code>, [=apply the pending render state=].
1. If [=check the layers state=] with |session|'s {{XRSession/renderState}} is <code>false</code>, abort these steps.
1. If |session|'s [=XRSession/mode=] is {{XRSessionMode/"inline"}} and |session|'s {{XRSession/renderState}}'s [=XRRenderState/output canvas=] is <code>null</code>, abort these steps.
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