vulkano vertex attributes

gistfile1.txt

So my vertex shader inputs look like this, pretty basic:

    layout(location = 0) in vec2 v_pos;
    layout(location = 1) in vec2 v_tex;
    layout(location = 2) in vec4 v_col;
    layout(location = 3) in vec4 v_opt;

And after following the examples, I can implement the `Vertex` trait on my struct using this macro:

    #[derive(Default, Debug, Clone)]
    struct Vertex {
        v_pos: [f32; 2],
        v_tex: [f32; 2],
        v_col: [f32; 4],
        v_opt: [f32; 4],
    }
    vulkano::impl_vertex!(Vertex, v_pos, v_tex, v_col, v_opt);

All is good. But in OpenGL, I never use 4 32-bit floats for colors, I just use 4-byte colors and tell `glVertexAttribPointer` to normalize them. So I want my vertices to look like this...

    #[derive(Default, Debug, Clone)]
    struct Vertex {
        v_pos: [f32; 2],
        v_tex: [f32; 2],
        v_col: [u8; 4],
        v_opt: [u8; 4],
    }

But when I actually create my pipeline later on...

    GraphicsPipeline::start()
        .vertex_input_single_buffer::<Vertex>()
        ...

I get this type mismatch error.

    IncompatibleVertexDefinition(FormatMismatch { attribute: "v_col", shader: (R32G32B32A32Sfloat, 1), definition: (U8, 4) })

The error is very clear. But how do I tell Vulkano that `v_col` and `v_opt` should be R8G8B8A8Unorm formatted? I didn't see anywhere in the example code where I could specify the attribute format, only its offset and name.

thanks!

Hey :) Did you figure this out? I'm having the same problem.

No i did not, sorry. i’ve moved away from vulkano unfortunately.

Thanks for the reply :) Out of curiosity, what did you move to?

i'm using Glutin and OpenGL right now. i've set up my system so that i can swap out graphics systems, so i hope to get proper DX/Vulkan renderers at some point, but it's just too complicated for me at the moment. hopefully at some point we'll get a very usable library that wraps these things (if i was talented i would write it myself).