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kvark merged 3 commits into from
Apr 12, 2021
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Explainer: mini-section on bitflags #1615

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Explainer: mini-section on bitflags
kainino0x Apr 9, 2021
67a849f
Mention issue 747
kainino0x Apr 9, 2021
62457dd
more rationale, thanks kvark
kainino0x Apr 9, 2021
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Explainer: mini-section on bitflags
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@kainino0x
kainino0x committed Apr 9, 2021
commit 3f25a8b3ea221a4c711aa307596a18316e8bb89a
22 changes: 22 additions & 0 deletions explainer/index.bs
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Expand Up @@ -730,5 +730,27 @@ When using advanced methods to transfer data to the GPU (with a rolling list of

## Bitflags ## {#bitflags}

WebGPU uses C-style bitflags in several places.
(Search `GPUFlagsConstant` in the spec for instances.)
A typical bitflag definition looks like this:

<xmp highlight=idl>
typedef [EnforceRange] unsigned long GPUColorWriteFlags;
[Exposed=Window]
interface GPUColorWrite {
const GPUFlagsConstant RED = 0x1;
const GPUFlagsConstant GREEN = 0x2;
const GPUFlagsConstant BLUE = 0x4;
const GPUFlagsConstant ALPHA = 0x8;
const GPUFlagsConstant ALL = 0xF;
};
</xmp>

This was chosen because there is no other particularly ergonomic way to describe
"enum sets" in JavaScript today.
The closest option is `sequence<enum type>`, but it doesn't naturally describe
an unordered set of unique items and doesn't easily allow things like
`GPUColorWrite.ALL` above.


# WebGPU Shading Language # {#wgsl}