Move some existing enums into block 0x0001

[kainino0x]

For #214, we need to move some things into block 0x0001. Filing separately because I forgot about it when it was part of that issue.

• WGPUSType
  • SurfaceSource*
  • ShaderSourceSPIRV probably
  • ShaderSourceWGSL?? [1]
  • SurfaceColorManagement? [1]
• WGPUPredefinedColorSpace? [1]
• WGPUToneMappingMode? [1]

Not sure how the codegen will work for this, but see #417 for a first attempt.

[kainino0x]

[1] I'm not really sure whether [SurfaceColorManagement, WGPUPredefinedColorSpace, WGPUToneMappingMode] should be in block 0x0000 or 0x0001. They are not "C-specific" which is the currently-written definition of block 0x0001, but they are optional if we don't require all implementations to implement them. Maybe we should change the definition of block 0x0001.

[Kangz]

Aren't they native-specific though? As in they wouldn't be exposed in the Web ever?

[kainino0x]

My note [1] is specifically about SurfaceColorManagement, WGPUPredefinedColorSpace, and WGPUToneMappingMode (edited above) which are always exposed on web and (I'm proposing) may not be implemented in non-web. I think it makes sense to somehow separate required-but-post-1.0 extensions from optional extensions, though it's not really necessary.

[kainino0x]

Dec 12 meeting:

• KN: What should be the exact definition of block 0x0001? First we said "multi-implementation native" and then we said "multi-implementation C-specific" but I would like to propose that it should be generally all "multi-implementation" extensions (i.e. any enum value not required to be understood by an implementation).
• CF: Think that's fine. Don't think we should get too deep into how to define block 1. Just "Not base spec".
• Agreed

[kainino0x]

Writing out all of the current extension structs to make sure I know what block they belong in:

• WGPURenderPassMaxDrawCount: 0x0000
• WGPUShaderSourceWGSL: 0x0000
• WGPUShaderSourceSPIRV: 0x0001 ?? because it's presumably optional but let's discuss briefly
• WGPUSurfaceColorManagement: 0x0001
• WGPUSurfaceSource{AndroidNativeWindow,MetalLayer,WaylandSurface,WindowsHWND,XCBWindow,XlibWindow}: 0x0001

[kainino0x]

Dec 19 meeting:

• KN: If block 0x0000 is "core" i.e. "required to implement" then I think WGPUShaderSourceSPIRV should be in block 0x0001, "non-core extension", i.e. "optional to implement". Presumably WGPUShaderSourceWGSL is block 0x0000 though.
• CF/LK: Sounds good.