[naga] Why do some properties have an extra underscore after their names are converted to WGSL?

[Fmansama]

For example, my Material_Texture2D_0 property has become Material_Texture2D_0_
and my Material_Texture2D_1 attribute has become Material_Texture2D_1_.

[Fmansama]

Is there a parameter that allows the tool not to change the property name?

[Fmansama]

There is no underscore in the property name in the spv file, I don't know why there is an extra underscore after converting spv to wgsl.

[kpreid]

naga::proc::Namer renames identifiers in case an identifier in the input is not valid in the output language. This may cause name collisions, so it uses suffixes like _0, _1, _2, etc. Therefore, it has to also adjust input identifiers that end with _<number> so that they are guaranteed not to conflict with its own numbering.

It would be possible to do better than this, but only by adopting a multi-pass architecture with more intermediate representations which can determine the whole set of identifiers needing names before writing any of those names, and Naga is designed to be extremely simple since it has to be shipped with applications, so this has not been done.

[kpreid]

Oh, this was already answered in #7903, too.