Inject code into shader code dynamically

[TomjWolcott]

Hi, I'm crossposting my post here from the discord. I was wondering how to edit the shader.wgsl as a string after it has loaded so I could dynamically add/switch out implementations of this wgsl function:

// The real project fn will be injected here
fn project_onto_manifold(pos: vec4<f32>) -> vec4<f32> {
}

I was able to do this easily when using winit and wgpu by just editing shader.wgsl as a string:

let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
    label: Some("Shader"),
    source: wgpu::ShaderSource::Wgsl(manifold.insert_into_wgsl(
        include_str!("shader.wgsl").into()
    ).unwrap().as_str().into()),
});

but since bevy loads the shader through the asset server as Handle<Shader> and since the Shader struct doesn't seem to contain the contents of the wgsl file as a string, I'm not sure inject the various implementations. Btw, the bevy code I'm using right now is just the post processing example: https://bevyengine.org/examples/Shaders/post-processing/. Also I'm using bevy 0.11.3