support for GL_EXT_multisampled_render_to_texture

[Rik Cabanier]

All,

I was wondering if this extension was implemented in Angle.

I see comments and code where it's implemented but the extension list marks it as unsupported and it also doesn't seem to be exposed in chromium.

Is it supported?

[Geoff Lang]

It depends on the backend API being used. We support it on Vulkan, GL (depends on what the driver supports) and D3D11 (emulated). Metal also has an implementation that is incomplete.

Geoff

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[Rik Cabanier]

Thanks for the reply!

I'm running Chromium with the Vulkan backend and it doesn't seem to be working. Is there something I need to do to enable it?

[Geoff Lang]

It will depend on the hardware you're using. The condition to enable it is fairly complex in Vulkan, not being on a tile-based GPU is the main reason to disable it.

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[Rik Cabanier]

Very useful to have a reference to the code that enables it.

We're using it on our mobile hardware in GL (Meta Quest) so it should be supported. I'll do some more debugging.