Enum ParamValue 

pub enum ParamValue {
    Texture(RawAssetHandle),
    Cubemap(RawAssetHandle),
    Sampler(SamplerKind),
    Float(f32),
    Vec4([f32; 4]),
    Bytes(Vec<u8>),
}

The small, closed vocabulary of value kinds a material instance parameter can be. Arrays instead of a math-library type so this module has no dependency beyond wgpu itself — convert to/from your own vector type at the call site.

Variants

Texture(RawAssetHandle)

Cubemap(RawAssetHandle)

Sampler(SamplerKind)

Float(f32)

Vec4([f32; 4])

Bytes(Vec<u8>)

Escape hatch: raw bytes for anything not covered above (e.g. a custom struct of several packed values).