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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Mar 16 16:03:09 UTC 2018


--- Comment #8 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to atomnuker from comment #7)
> (In reply to Lionel Landwerlin from comment #6)
> > (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
> > > 
> > > 
> > 
> > As far as I can tell, compatible formats apply to images, not image views.
> They do:
> https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.
> html#VkImageViewCreateInfo
> >If image was created with the VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT and the image has
> >a multi-planar format, and if subresourceRange.aspectMask is VK_IMAGE_ASPECT_PLANE_0_BIT,
> >VK_IMAGE_ASPECT_PLANE_1_BIT, or VK_IMAGE_ASPECT_PLANE_2_BIT, format must be compatible
> >with the corresponding plane of the image, and the sampler to be used with the image view
> >must not enable sampler Y’CBCR conversion. The width and height of the single-plane image
> >view must be derived from the multi-planar image’s dimensions in the manner listed for
> >plane compatibility for the plane.
> >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.
> Hmm, seems like you're right. Once I flag the bit it works. However, that
> bit isn't flagged as supported
> in either linearly or optimally tiled images (of multiplane format).

We don't support storage on multiplanar formats indeed.

But R8_UNORM should be reported as supporting storage.

> Should this be flagged as supported? It seems like it works.

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