Dynamic vertex buffer layouts?

[DiThi]

In all the examples we have something like this

struct Vertex { position: [f32; 2] }
impl_vertex!(Vertex, position);

but I want to load a bunch of different meshes, some with normals, some with one or more UV layers, colors, skeletal weights, etc...

Is it possible to specify the layout at run time?

I'm sorry if there's a simple solution with a Rust feature I've missed.

[tomaka]

It is doable, but not easy yet. Basically you have to implement the VertexDefinition and VertexSource traits on a struct of yours.

There is an example here: https://github.com/tomaka/vulkano-examples/blob/81f5a4eb3c5f3fcc6a194d3c41e53b2bc66f7add/gltf/gltf_system.rs#L687-L795

[Rua]

Would a partial solution be to make the Vertex trait take &self? Then it would be easy to make a custom type that returns runtime values in the member method. The various VertexDefinition types would need to take this as an argument instead of as a type.

[Rua]

There is now the VertexInputState type that gives you the same freedom as plain Vulkan.