wgpu

gistfile1.rs

// I set up my mesh and insert my custom attribute with an empty value
pub const ATTRIBUTE_FRAME: MeshVertexAttribute =
    MeshVertexAttribute::new("frame", 988540917, VertexFormat::Float32x2);
let mut mesh = Mesh::from(shape::Quad::new(Vec2::splat(48.0)));
let empty: Vec<[f32; 2]> = vec![[0.0; 2]; 4];
mesh.insert_attribute(ATTRIBUTE_FRAME, empty);


// Add attribute with batched values in batch loop
if let Ok(mesh_handle) = mesh_handles.get(batcher) {
    if let Some(mesh) = meshes.get_mut(&mesh_handle.0) {
            mesh.insert_attribute(Mesh::ATTRIBUTE_POSITION, batch.positions.to_owned());
            mesh.insert_attribute(Mesh::ATTRIBUTE_NORMAL, batch.normals.to_owned());
            mesh.insert_attribute(Mesh::ATTRIBUTE_UV_0, batch.uvs.to_owned());
            mesh.insert_attribute(ATTRIBUTE_FRAME, batch.frames.to_owned());
            mesh.set_indices(Some(Indices::U16(batch.indices.to_owned())));
    }
};

//Update my material description and give attribuate a location
fn specialize(
    descriptor: &mut RenderPipelineDescriptor,
    layout: &MeshVertexBufferLayout,
    _key: Material2dKey<Self>,
) -> Result<(), SpecializedMeshPipelineError> {
    ...
    let vertex_layout = layout.get_layout(&[
        Mesh::ATTRIBUTE_POSITION.at_shader_location(0),
        Mesh::ATTRIBUTE_NORMAL.at_shader_location(1),
        Mesh::ATTRIBUTE_UV_0.at_shader_location(2),
        ATTRIBUTE_FRAME.at_shader_location(3),
    ])?;
    descriptor.vertex.buffers = vec![vertex_layout];
}

// try to access as argument
@fragment
fn fragment(
    @location(0) pos: vec4<f32>,
    @location(1) norm: vec3<f32>,
    @location(2) uv: vec2<f32>,
    @location(3) frame: vec2<f32>
) -> @location(0) vec4<f32> {
    ...
}



//However keep getting

/*
panicked at 'wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `transparent_mesh2d_pipeline`
    error matching FRAGMENT shader requirements against the pipeline
    location[3] Float32x2 interpolated as Some(Perspective) with sampling Some(Center) is not provided by the previous stage outputs
    input is not provided by the earlier stage in the pipeline
*/