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println!("cargo:rerun-if-env-changed=SLANG_DIR"); + Some(env::var("SLANG_DIR").ok()?.into()) +} + +fn do_link_cmake() -> Option { + let cmake_output = cmake::Config::new("./slang") + // https://github.com/shader-slang/slang/issues/5832#issuecomment-2533324982 + .define("CMAKE_SKIP_INSTALL_RULES", "ON") + .build_target("slang") + .build(); + + for build_type in ["Debug", "Release"] { + let slang_dir = cmake_output.join("build").join(build_type); + if slang_dir.exists() { + return Some(slang_dir); + } + } + + None +} fn main() { - println!("cargo:rerun-if-env-changed=SLANG_DIR"); - let slang_dir = env::var("SLANG_DIR").map(PathBuf::from).expect( - "Environment variable `SLANG_DIR` should be set to the directory of a Slang installation.", - ); + println!("cargo:rerun-if-changed=build.rs"); - let out_dir = env::var("OUT_DIR") - .map(PathBuf::from) - .expect("Couldn't determine output directory."); - - link_libraries(&slang_dir); + let slang_dir = do_link_env() + .or_else(do_link_cmake) + .expect("Unable to locate slang"); + println!("cargo:rustc-link-lib=dylib=slang"); + println!("cargo:rustc-link-search=native={}", slang_dir.join("lib").display()); bindgen::builder() .header(slang_dir.join("include/slang.h").to_str().unwrap()) @@ -40,21 +59,10 @@ fn main() { .derive_copy(true) .generate() .expect("Couldn't generate bindings.") - .write_to_file(out_dir.join("bindings.rs")) + .write_to_file(format!("{}/bindings.rs", env::var("OUT_DIR").unwrap())) .expect("Couldn't write bindings."); } -fn link_libraries(slang_dir: &Path) { - let lib_dir = slang_dir.join("lib"); - - if !lib_dir.is_dir() { - panic!("Couldn't find the `lib` subdirectory in the Slang installation directory.") - } - - println!("cargo:rustc-link-search=native={}", lib_dir.display()); - println!("cargo:rustc-link-lib=dylib=slang"); -} - #[derive(Debug)] struct ParseCallback {} diff --git a/slang-sys/slang b/slang-sys/slang new file mode 160000 index 0000000..4003d33 --- /dev/null +++ b/slang-sys/slang @@ -0,0 +1 @@ +Subproject commit 4003d337a7e9b84a8c0609bb8069460f82f5d673