Fix example-runner-ash

[hatoo]

example-runner-ash fails to run because it fails to get sky_shader.

thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', examples\runners\ash\src\main.rs:706:74
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: process didn't exit successfully: `target\debug\example-runner-ash.exe` (exit code: 101)

compile_shaders() had obtained shader name from path.file_stem() but path is

[examples\runners\ash\src\main.rs:212] &spv_paths = [
    "C:\\Users\\hato2\\Desktop\\rust-gpu\\target\\spirv-unknown-vulkan1.1\\release\\deps\\sky_shader.spv.dir\\module",
]

in my environment (Windows11).

I've fixed compile_shaders() to return corrent shader name from path.
Sorry if this fix is incompatioble for other environments.

[khyperia]

... oh wow, yeah, this code is really incorrect and should not be grabbing the name from the filename - and like, it's excessively weirdly complicated. I think I'd prefer to change the whole function to just something like this:

fn compile_shaders() -> Vec<SpvFile> {
    let sky_shader_path =
        SpirvBuilder::new("examples/shaders/sky-shader", "spirv-unknown-vulkan1.1")
            .print_metadata(MetadataPrintout::None)
            .build()
            .unwrap()
            .module
            .unwrap_single()
            .to_path_buf();
    let sky_shader = SpvFile {
        name: "sky_shader".to_string(),
        data: read_spv(&mut File::open(sky_shader_path).unwrap()).unwrap(),
    };
    vec![sky_shader]
}

and to be honest, I don't know why we're even doing this whole Vec<SpvFile> thing instead of just returning a module... the fact that it's been broken for months and nobody noticed until now is a good argument for what we've been considering for a while, and just nuking the whole thing, haha.

[hatoo]

Yeah, I agree that the code is complicated.
I copypasted your code. And confirmed to run.