[Bug 105496] Using a single-plane imageview from a multi-plane image is broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105496

--- Comment #5 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to atomnuker from comment #3)
> (In reply to Lionel Landwerlin from comment #1)
> > I think the mistake here is that you're using a single image with 2
> > different view. This requires a compatible format between the 2 views. R8 &
> > G8_B8_R8_3PLANE_420 are not compatible.
> 
> Yes they are. Read this. It's right at the top.
> https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.
> html#features-formats-compatible-planes
> 
> 
> > 
> > The feature you want to use is VK_IMAGE_CREATE_ALIAS_BIT. You'll need to
> > create 2 image & 2 views and have the 2 images share the same memory.
> 
> It's a solution, though not the one I want, is recommended by the spec or
> something I'd like to waste time just to find out it doesn't work.
> 

One thing that was also missing on the traces is that no image seem to be
created with VK_IMAGE_USAGE_STORAGE_BIT, which what is needed for descriptors
of type VK_DESCRIPTOR_TYPE_STORAGE_IMAGE.
That seems to hit an assert in my debug build.

> 
> > 
> > This is a bit confusing to be fair :) I had to reread the spec, even I
> > implemented this...
> 
> That would explain why it doesn't work.
> 
> 
> > 
> > Consider running your application with the validation layers, it'll help
> > spotting potential mistakes like this.
> 
> I am running it through validation layers every time and I've reported all
> of the issues on multiplane images, including the one where they don't list
> R8 and G8_B8_R8 as compatible. It'll get fixed.
> Though considering how many assertions have been made in the validation
> layers that no one will ever bother with multiplane images I'm getting
> tired. Though the fact that they're slowly getting fixed one at a time gives
> me hope.

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