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Introduce MLContext.createContextAsync #285

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Introduce MLContext.createContextAsync #285

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38 changes: 37 additions & 1 deletion index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -563,8 +563,13 @@ dictionary MLContextOptions {

[SecureContext, Exposed=(Window, DedicatedWorker)]
interface ML {
[Exposed=(DedicatedWorker)]
MLContext createContext(optional MLContextOptions options = {});
[Exposed=(DedicatedWorker)]
MLContext createContext(GPUDevice gpuDevice);

Promise<MLContext> createContextAsync(optional MLContextOptions options = {});
Promise<MLContext> createContextAsync(GPUDevice gpuDevice);
};
</script>

Expand All @@ -583,8 +588,36 @@ The {{ML/createContext()}} method steps are:
<dd>Set |context|.{{[[deviceType]]}} to "[=device-type-gpu|gpu=]".
<dd>Set |context|.{{[[powerPreference]]}} to "[=power-preference-default|default=]".
</dl>
1. If the User Agent can support the |context|.{{[[contextType]]}}, |context|.{{[[deviceType]]}} and |context|.{{[[powerPreference]]}}, then:
1. Set |context|.{{MLContext/[[implementation]]}} to an implementation supporting |context|.{{[[contextType]]}}, |context|.{{[[deviceType]]}} and |context|.{{[[powerPreference]]}}.
1. Else:
1. Throw an {{NotSupportedError}} {{DOMException}} and stop.
1. Return |context|.

The {{ML/createContextAsync()}} method steps are:
1. If [=this=]'s [=relevant global object=]'s [=associated Document=] is not [=allowed to use=] the [=webnn-feature|webnn=] feature, then throw a "{{SecurityError!!exception}}" {{DOMException}} and abort these steps.
1. Let |promise| be [=a new promise=].
1. Let |context| be a new {{MLContext}} object.
1. Switch on the method's first argument:
<dl class=switch>
<dt>{{MLContextOptions}}
<dd>Set |context|.{{[[contextType]]}} to [=default-context|default=].
<dd>Set |context|.{{[[deviceType]]}} to the value of {{MLContextOptions}}'s {{deviceType}}.
<dd>Set |context|.{{[[powerPreference]]}} to the value of {{MLContextOptions}}'s {{powerPreference}}.

<dt>{{GPUDevice}}
<dd>Set |context|.{{[[contextType]]}} to [=webgpu-context|webgpu=].
<dd>Set |context|.{{[[deviceType]]}} to "[=device-type-gpu|gpu=]".
<dd>Set |context|.{{[[powerPreference]]}} to "[=power-preference-default|default=]".
</dl>
1. Issue the following steps to a separate timeline:
1. If the User Agent can support the |context|.{{[[contextType]]}}, |context|.{{[[deviceType]]}} and |context|.{{[[powerPreference]]}}, then:
1. Set |context|.{{MLContext/[[implementation]]}} to an implementation supporting |context|.{{[[contextType]]}}, |context|.{{[[deviceType]]}} and |context|.{{[[powerPreference]]}}.
1. [=Resolve=] |promise| with |context|.
1. Else:
1. [=Resolve=] |promise| with a new {{NotSupportedError}}.
1. Return |promise|.

### Permissions Policy Integration ### {#permissions-policy-integration}

This specification defines a <a>policy-controlled feature</a> identified by the
Expand Down Expand Up @@ -645,6 +678,9 @@ interface MLContext {};
: <dfn>\[[powerPreference]]</dfn> of type [=power preference=]
::
The {{MLContext}}'s [=power preference=].
: <dfn>\[[implementation]]</dfn>
::
The underlying implementation provided by the User Agent.
</dl>

<div class="note">
Expand Down Expand Up @@ -2313,7 +2349,7 @@ partial interface MLGraphBuilder {
efficient implementation for it, therefore its usage is encouraged from the
performance standpoint.
<pre highlight="js">
return builder.div(x, builder.add(builder.constant(1), build.abs(x)));
return builder.div(x, builder.add(builder.constant(1), builder.abs(x)));
</pre>
</div>
</div>
Expand Down