alex/beta-minecraft-rust

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//! Compiles every `shaders/*.slang` file to SPIR-V with `slangc`.

use std::path::Path;
use std::process::Command;

fn main() {
    let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR is set by cargo");
    let slangc = std::env::var("SLANGC").unwrap_or_else(|_| "slangc".into());
    println!("cargo:rerun-if-env-changed=SLANGC");
    println!("cargo:rerun-if-changed=shaders");

    for entry in std::fs::read_dir("shaders").expect("shaders directory exists") {
        let path = entry.expect("readable shaders directory").path();
        if path.extension().is_none_or(|ext| ext != "slang") {
            continue;
        }
        let output =
            Path::new(&out_dir).join(path.with_extension("spv").file_name().expect("file name"));
        let status = Command::new(&slangc)
            .arg(&path)
            .args(["-target", "spirv", "-profile", "spirv_1_6"])
            .args([
                "-matrix-layout-column-major",
                "-fvk-use-entrypoint-name",
                "-O2",
                "-o",
            ])
            .arg(&output)
            .status()
            .unwrap_or_else(|error| {
                panic!("failed to run {slangc} (install shader-slang or set SLANGC): {error}")
            });
        assert!(status.success(), "slangc failed for {}", path.display());
    }
}