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Propose WEBGL_present, allowing for early Present. #2564

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Propose WEBGL_present, allowing for early Present. #2564

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e3b80a9
Propose WEBGL_present, allowing for early Present.
kdashg Dec 19, 2017
43e5748
Clarify behavior.
kdashg Dec 19, 2017
c0d9405
typo
kdashg Dec 21, 2017
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57 changes: 57 additions & 0 deletions extensions/proposals/WEBGL_present/extension.xml
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Original file line number Diff line number Diff line change
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<?xml version="1.0" encoding="UTF-8"?>
<proposal href="proposals/WEBGL_present/">
<name>WEBGL_present</name>

<contact> <a href="https://www.khronos.org/webgl/public-mailing-list/">WebGL
working group</a> (public_webgl 'at' khronos.org) </contact>

<contributors>
<contributor>Jeff Gilbert, Mozilla</contributor>
</contributors>

<number>NN</number>

<depends>
<api version="1.0"/>
</depends>

<overview>
<p>
This extension allows content to initiate a Present action early, instead of waiting for the
standard end-of-frame auto-Present mechanism.
</p>

<features>
<feature>
<code>present()</code> triggers canvas-related Present early, but does not immediately
trigger page composition.
After calling present, the context respects preserveDrawingBuffer like usual, and clears
the backbuffer-dirty bit, but does not clear the canvas-dirty bit.
The canvas-dirty bit means the now-frontbuffer (previously-backbuffer) will be composited
like normal at the end of the frame.
</feature>
<feature>
<code>autoPresent</code> disables (or re-enables) the default backbuffer-dirty auto-Present.
When disabled, the context will not automatically Present its backbuffer to the compositor
even if the backbuffer has been drawn into.
In this case, <code>present()</code> is the only way trigger Presentation of the backbuffer
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way trigger -> way to trigger

to the compositor.
</feature>
</features>
</overview>

<idl xml:space="preserve">
[NoInterfaceObject]
interface WEBGL_present {
attribute boolean autoPresent = true;

void present();
};
</idl>

<history>
<revision date="2017/12/19">
<change>Initial revision.</change>
</revision>
</history>
</proposal>