[WebXR] Provide a way to bind and unbind IOSurfaces to ANGLE Pbuffers

[Dean Jackson]

WebXR on Cocoa platforms gets framebuffer texture targets via IOSurfaces. Those must be attached to ANGLE Pbuffers, which are then bound to GL textures. There is already some code in GraphicsContextGL (and in the CoreVideo classes) to do this, but this is an attempt to make a generic function that will handle all use cases.

[Radar WebKit Bug Importer]

<rdar://problem/78652783>

[Dean Jackson]

Created attachment 430106 [details]
Patch

[Sam Weinig]

Comment on attachment 430106 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=430106&action=review

> Source/WebCore/platform/graphics/cocoa/GraphicsContextGLOpenGLCocoa.mm:651
> +    auto usageHintAngle = [&] () -> EGLint {
> +        if (usage == PbufferAttachmentUsage::Read)
> +            return EGL_IOSURFACE_READ_HINT_ANGLE;
> +        return EGL_IOSURFACE_WRITE_HINT_ANGLE;
> +    }();

Never both?

> Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGL.h:574
> +    friend class WebXROpaqueFramebuffer;

This is a layering violation. Platform level concepts should not be aware of things like WebXR. Why is this needed? Why not just make this public?

> Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGL.h:578
> +    enum class PbufferAttachmentUsage {
> +        Read,
> +        Write
> +    };

I would put this all on one line.

[Dean Jackson]

Comment on attachment 430106 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=430106&action=review

>> Source/WebCore/platform/graphics/cocoa/GraphicsContextGLOpenGLCocoa.mm:651
>> +    }();
> 
> Never both?

Good point. I'll check if ANGLE handles that and add it if so.

>> Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGL.h:574
>> +    friend class WebXROpaqueFramebuffer;
> 
> This is a layering violation. Platform level concepts should not be aware of things like WebXR. Why is this needed? Why not just make this public?

Duh, of course. Yeah, I'll make them public.

>> Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGL.h:578
>> +    };
> 
> I would put this all on one line.

ok!

[Dean Jackson]

Created attachment 430146 [details]
Patch

[Dean Jackson]

Committed r278260 (238297@main): <https://commits.webkit.org/238297@main>