Polygon mode support

[phr34k]

I am trying to use wgpu-py in a research setting coming from a jupyter background. I was looking for a way to render triangles as wireframes i.e. polygon mode. This seem to be exposed on wgpu at least, but I couldn't find any information about it from the documentation. Is there a way to set polygon mode?

[Vipitis]

It seems to not be in wgpu-native yet: gfx-rs/wgpu-native#384 (review), so it would need to be supported there first.

Perhaps you could handle it in the fragment shader for now? (pygfx has a wireframe material: https://docs.pygfx.org/stable/_gallery/feature_demo/wireframe_material.html)

[almarklein]

For the record, what is needed to support it:

• webgpu-headers would need to add a PolygonMode enum and add a polygon_mode field to the PrimitiveState struct.
• wgpu-native would need to update it's wgpuDeviceCreateRenderPipeline and wgpuDeviceCreateRenderPipelineAsync.
• We (wgpu-py) would need to update the same functions.