cpal/asio-sys/build.rs

186 lines
6.6 KiB
Rust

extern crate bindgen;
extern crate cc;
extern crate walkdir;
use std::env;
use std::path::PathBuf;
use walkdir::WalkDir;
const CPAL_ASIO_DIR: &'static str = "CPAL_ASIO_DIR";
const ASIO_HEADER: &'static str = "asio.h";
const ASIO_SYS_HEADER: &'static str = "asiosys.h";
const ASIO_DRIVERS_HEADER: &'static str = "asiodrivers.h";
fn main() {
// If ASIO directory isn't set silently return early
let cpal_asio_dir_var = match env::var(CPAL_ASIO_DIR) {
Err(_) => return,
Ok(var) => var,
};
// Asio directory
let cpal_asio_dir = PathBuf::from(cpal_asio_dir_var);
// Directory where bindings and library are created
let out_dir = PathBuf::from(env::var("OUT_DIR").expect("bad path"));
// Check if library exists
// if it doesn't create it
let mut lib_path = out_dir.clone();
lib_path.push("libasio.a");
if !lib_path.exists() {
create_lib(&cpal_asio_dir);
}
// Print out links to needed libraries
println!("cargo:rustc-link-lib=dylib=ole32");
println!("cargo:rustc-link-lib=dylib=User32");
println!("cargo:rustc-link-search={}", out_dir.display());
println!("cargo:rustc-link-lib=static=asio");
// Check if bindings exist
// if they dont create them
let mut binding_path = out_dir.clone();
binding_path.push("asio_bindings.rs");
if !binding_path.exists() {
create_bindings(&cpal_asio_dir);
}
}
fn create_lib(cpal_asio_dir: &PathBuf) {
let mut cpp_paths: Vec<PathBuf> = Vec::new();
let mut host_dir = cpal_asio_dir.clone();
let mut pc_dir = cpal_asio_dir.clone();
let mut common_dir = cpal_asio_dir.clone();
host_dir.push("host");
common_dir.push("common");
pc_dir.push("host/pc");
// Gathers cpp files from directories
let walk_a_dir = |dir_to_walk, paths: &mut Vec<PathBuf>| {
for entry in WalkDir::new(&dir_to_walk).max_depth(1) {
let entry = match entry {
Err(_) => continue,
Ok(entry) => entry,
};
match entry.path().extension().and_then(|s| s.to_str()) {
None => continue,
Some("cpp") => {
// Skip macos bindings
if entry.path().file_name().unwrap().to_str() == Some("asiodrvr.cpp") {
continue;
}
paths.push(entry.path().to_path_buf())
}
Some(_) => continue,
};
}
};
// Get all cpp files for building SDK library
walk_a_dir(host_dir, &mut cpp_paths);
walk_a_dir(pc_dir, &mut cpp_paths);
walk_a_dir(common_dir, &mut cpp_paths);
// build the asio lib
cc::Build::new()
.include(format!("{}/{}", cpal_asio_dir.display(), "host"))
.include(format!("{}/{}", cpal_asio_dir.display(), "common"))
.include(format!("{}/{}", cpal_asio_dir.display(), "host/pc"))
.include("asio-link/helpers.hpp")
.file("asio-link/helpers.cpp")
.files(cpp_paths)
.cpp(true)
.compile("libasio.a");
}
fn create_bindings(cpal_asio_dir: &PathBuf) {
let mut asio_header = None;
let mut asio_sys_header = None;
let mut asio_drivers_header = None;
// Recursively walk given cpal dir to find required headers
for entry in WalkDir::new(&cpal_asio_dir) {
let entry = match entry {
Err(_) => continue,
Ok(entry) => entry,
};
let file_name = match entry.path().file_name().and_then(|s| s.to_str()) {
None => continue,
Some(file_name) => file_name,
};
match file_name {
ASIO_HEADER => asio_header = Some(entry.path().to_path_buf()),
ASIO_SYS_HEADER => asio_sys_header = Some(entry.path().to_path_buf()),
ASIO_DRIVERS_HEADER => asio_drivers_header = Some(entry.path().to_path_buf()),
_ => (),
}
}
macro_rules! header_or_panic {
($opt_header:expr, $FILE_NAME:expr) => {
match $opt_header.as_ref() {
None => {
panic!("Could not find {} in {}: {}", $FILE_NAME, CPAL_ASIO_DIR, cpal_asio_dir.display());
},
Some(path) => path.to_str().expect("Could not convert path to str"),
}
};
}
// Only continue if found all headers that we need
let asio_header = header_or_panic!(asio_header, ASIO_HEADER);
let asio_sys_header = header_or_panic!(asio_sys_header, ASIO_SYS_HEADER);
let asio_drivers_header = header_or_panic!(asio_drivers_header, ASIO_DRIVERS_HEADER);
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let bindings = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header(asio_header)
.header(asio_sys_header)
.header(asio_drivers_header)
.header("asio-link/helpers.hpp")
.clang_arg("-x")
.clang_arg("c++")
.clang_arg("-std=c++14")
.clang_arg( format!("-I{}/{}", cpal_asio_dir.display(), "host/pc") )
.clang_arg( format!("-I{}/{}", cpal_asio_dir.display(), "host") )
.clang_arg( format!("-I{}/{}", cpal_asio_dir.display(), "common") )
// Need to whitelist to avoid binding tp c++ std::*
.whitelist_type("AsioDrivers")
.whitelist_type("AsioDriver")
.whitelist_type("ASIOTime")
.whitelist_type("ASIODriverInfo")
.whitelist_type("ASIOBufferInfo")
.whitelist_type("ASIOCallbacks")
.whitelist_type("ASIOSampleType")
.whitelist_type("ASIOChannelInfo")
.whitelist_function("destruct_AsioDrivers")
.whitelist_function("ASIOGetChannels")
.whitelist_function("ASIOGetChannelInfo")
.whitelist_function("ASIOGetBufferSize")
.whitelist_function("get_sample_rate")
.whitelist_function("ASIOInit")
.whitelist_function("ASIOCreateBuffers")
.whitelist_function("ASIOStart")
.whitelist_function("ASIOStop")
.whitelist_function("ASIODisposeBuffers")
.whitelist_function("ASIOExit")
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").expect("bad path"));
//panic!("path: {}", out_path.display());
bindings
.write_to_file(out_path.join("asio_bindings.rs"))
.expect("Couldn't write bindings!");
}