How to achieve the wireframe rendering feature

[Eagleton]

Well, at first I wanted to use geometry shader to achieve wireframe rendering, like https://github.com/Chaser324/unity-wireframe do. But I find that wgpu only has compute, vertex, and fragment shaders and I believe this is by design. And then, I find PolygonMode in wgpu::PrimitiveState have Line, but it requires Features::NON_FILL_POLYGON_MODE to be enabled.
And the question is how to enable the Features::NON_FILL_POLYGON_MODE?
If I can't do that, is there any way to do wireframe rendering?

[kvark]

You pass the features to request_device, which you want to enable. Passing any features is non-porable, and you need to check the adapter features first, technically. This is a feature in the first place because the native APIs do not guarantee it being available.

[Eagleton]

Well, I want to know if there is any example to learn

[kvark]

Take a look at the feature matrix of the examples - https://github.com/gfx-rs/wgpu/tree/master/wgpu/examples#feature-matrix
The thing relevant here is "polygon mode", which is indicated for the cube example.
It returns the feature here -

wgpu/wgpu/examples/cube/main.rs

Line 111 in c493b63

wgt::Features::NON_FILL_POLYGON_MODE

The example framework then uses it here -

wgpu/wgpu/examples/framework.rs

Line 148 in c493b63

features: (optional_features & adapter_features) | required_features,

[Eagleton]

Thank you!

[Eagleton]

I also want to ask another question, is there a way to achieve transparent wireframe with shaders? It means the faces are transparent

[kvark]

Blending is something to look for. Again, see the feature matrix.