Creating a TextureDimension::D1 texture with more than one miplevel does not fail

[Wumpf]

... but isn't supported in Metal which gives a very clear error about this

-[MTLTextureDescriptorInternal validateWithDevice:]:1248: failed assertion `Texture Descriptor Validation
MTLTextureDescriptor requests a mipmapLevelCount of 3 but the texture type MTLTextureType1D requires that mipmapLevelCount is 1
'

Similar to #2045

[Wumpf]

haven't checked what the webgpu spec actually says about this :)

[CatCode79]

The webgpu specs are "pretty vague" about mipmap level concepts: here
But on texture creation are more informative: here

What I found of interest is:

• descriptor.mipLevelCount must be greater than zero.

• If descriptor.sampleCount > 1:
  descriptor.mipLevelCount must be 1.
  descriptor.size.depthOrArrayLayers must be 1.
  descriptor.usage must not include the STORAGE_BINDING bit.
  descriptor.format must be a renderable format.

• descriptor.mipLevelCount must be less than or equal to maximum mipLevel count(descriptor.dimension, descriptor.size).

About mipmapLevelCount on apple developer docs:
https://developer.apple.com/documentation/metal/mtltexturedescriptor/1516300-mipmaplevelcount

Perhaps the part of the code with the necessary validation is the same one touched by this fix:
#2001

And in particular this line attracts me a lot:

wgpu/wgpu-core/src/device/mod.rs

Line 670 in 4af1c31

if mips == 0 || mips > hal::MAX_MIP_LEVELS || mips > desc.size.max_mips() {

Hope this helps.

[jinleili]

Verified on master branch of wgpu, this issue has been fixed