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Add support to return the number of created mip levels #245

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Merged
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Jan 28, 2021
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Add support to return the number of created mip levels #245

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5a75090
Merge pull request #54 from immersive-web/main
cabanier Jan 28, 2021
d3a3c75
Add support to return the number of created mip levels
cabanier Jan 28, 2021
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9 changes: 9 additions & 0 deletions webxrlayers-1.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -319,6 +319,7 @@ XRCompositionLayer defines a set of common attributes and behaviors across certa
attribute boolean blendTextureSourceAlpha;
attribute boolean? chromaticAberrationCorrection;
attribute float? fixedFoveation;
readonly attribute unsigned long mipLevels;

readonly attribute boolean needsRedraw;

Expand Down Expand Up @@ -346,6 +347,12 @@ rerendered in the next [=XR animation frame=]. It MAY be set when [=the underlyi
when the [=XR Compositor=] can no longer reproject the layer. Failing to redraw the content in the next [=XR animation frame=]
might cause flickering or other side effects.

The <dfn attribute for="XRCompositionLayer">mipLevels</dfn> attribute returns the depth of the mip chain. This MUST be equal
or smaller than the value requested in {{XRLayerInit/mipLevels}}.

NOTE: some platforms don't support mip levels. Authors should query {{XRCompositionLayer/mipLevels}} to determine if they can
target a certain mip level and not rely on the value they passed in {{XRLayerInit/mipLevels}}.

<div class="algorithm" data-algorithm="redrawLayerAlgo">
When <dfn>the underlying resources of a layer are lost</dfn> for an {{XRCompositionLayer}} |layer|,
the user agent MUST run the following steps:
Expand Down Expand Up @@ -950,6 +957,8 @@ For WebGL2 contexts these additional formats are supported:
- {{DEPTH24_STENCIL8}}

The <dfn dict-member for="XRLayerInit">mipLevels</dfn> attribute defines the desired number of mip levels in the color and texture data.
If the user agent can't create the requested number, it can create less. Authors MUST query {{XRCompositionLayer/mipLevels}} to determine
the actual number of mip levels.

The <dfn dict-member for="XRLayerInit">viewPixelWidth</dfn> and <dfn dict-member for="XRLayerInit">viewPixelHeight</dfn> attributes define
the rectangular dimensions of the {{XRCompositionLayer}}.
Expand Down