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build.rs
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build.rs
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// SPDX-FileCopyrightText: 2024 Julia DeMille <me@jdemille.com>
//
// SPDX-License-Identifier: MPL-2.0
use std::{
env, fs,
path::{Path, PathBuf},
str::FromStr,
};
use bindgen::{Builder as BindingBuilder, CodegenConfig};
use snafu::{prelude::*, FromString, ResultExt, Whatever};
use target_lexicon::{
Aarch64Architecture, Architecture, ArmArchitecture, BinaryFormat, Environment, OperatingSystem,
Triple,
};
fn get_clang_args(fmod_dir: &Path) -> Result<Vec<String>, Whatever> {
let include_dirs = vec![
"api/core/inc",
#[cfg(feature = "fsbank")]
"api/fsbank/inc",
#[cfg(feature = "studio")]
"api/studio/inc",
];
let include_dirs = include_dirs.into_iter().map(|dir| {
fmod_dir
.join(dir)
.to_str()
.ok_or_else(|| {
Whatever::without_source("A path could not be converted to UTF-8!".into())
})
.map(ToOwned::to_owned)
});
let defines: Vec<&str> = vec![
#[cfg(feature = "fsbank")]
"_BINDGEN_FSBANK_",
#[cfg(feature = "studio")]
"_BINDGEN_STUDIO_",
];
let args: Vec<String> = include_dirs
.map(|dir| dir.map(|dir| format!("-I{dir}")))
.chain(defines.into_iter().map(|def| Ok(format!("-D{def}"))))
.collect::<Result<_, _>>()?;
Ok(args)
}
#[allow(clippy::too_many_lines)]
fn handle_platform(fmod_dir: &Path) -> Result<(), Whatever> {
let triple = Triple::from_str(
&env::var("TARGET")
.whatever_context("The environment variable TARGET was not set. This shouldn't be possible in a build script.")?,
).whatever_context("Could not parse target triple!")?;
let core_libs = fmod_dir.join("api/core/lib");
let fsbank_libs = fmod_dir.join("api/fsbank/lib");
let studio_libs = fmod_dir.join("api/studio/lib");
let dbg = if cfg!(debug_assertions) { "L" } else { "" };
if matches!(triple.binary_format, BinaryFormat::Wasm) {
if cfg!(feature = "fsbank") {
whatever!("fsbank feature not supported on wasm!");
}
if cfg!(feature = "studio") {
let studio_libs = studio_libs.join("upstream/w32");
println!("cargo:rustc-link-search={}", studio_libs.display());
println!(
"cargo:rustc-link-lib=static:+verbatim=fmodstudio{dbg}:fmodstudio{dbg}_wasm.a"
);
} else {
let core_libs = core_libs.join("upstream/w32");
println!("cargo:rustc-link-search={}", core_libs.display());
println!("cargo:rustc-link-lib=static=fmod{dbg}:fmod{dbg}_wasm.a");
}
return Ok(());
}
match triple.operating_system {
OperatingSystem::Windows => {
let lib_suffix = Path::new(match triple.architecture {
Architecture::Arm(_) => "arm",
Architecture::X86_32(_) => "x86",
Architecture::X86_64 => "x64",
_ => whatever!("Unsupported architecture: {}", triple.architecture),
});
let lib_infix = if matches!(triple.vendor, target_lexicon::Vendor::Uwp) {
""
} else {
"_vc"
};
println!(
"cargo:rustc-link-search={}",
core_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmod{dbg}:fmod{dbg}{lib_infix}.lib");
if cfg!(feature = "fsbank") {
println!(
"cargo:rustc-link-search={}",
fsbank_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fsbank:fsbank_vc.lib"); // The _vc infix applies to UWP, too. Weird.
}
if cfg!(feature = "studio") {
println!(
"cargo:rustc-link-search={}",
studio_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmodstudio{dbg}:fmodstudio{dbg}{lib_infix}.lib");
}
}
OperatingSystem::MacOSX { .. } => {
println!("cargo:rustc-link-search={}", core_libs.display());
println!("cargo:rustc-link-lib=fmod{dbg}");
if cfg!(feature = "fsbank") {
println!("cargo:rustc-link-search={}", fsbank_libs.display());
println!("cargo:rustc-link-lib=fsbank{dbg}");
}
if cfg!(feature = "studio") {
println!("cargo:rustc-link-search={}", studio_libs.display());
println!("cargo:rustc-link-lib=fmodstudio{dbg}");
}
}
OperatingSystem::Linux => {
if matches!(
triple.environment,
Environment::Android | Environment::Androideabi
) {
let lib_suffix = Path::new(match triple.architecture {
Architecture::Arm(ArmArchitecture::Armv7a) => "armeabi-v7a",
Architecture::Aarch64(Aarch64Architecture::Aarch64) => "arm64-v8a",
Architecture::X86_32(_) => "x86",
Architecture::X86_64 => "x86_64",
_ => whatever!("Unsupported architecture: {}", triple.architecture),
});
println!(
"cargo:rustc-link-search={}",
core_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmod{dbg}");
if cfg!(feature = "fsbank") {
whatever!("fsbank feature is unsupported on Android!");
}
if cfg!(feature = "studio") {
println!(
"cargo:rustc-link-search={}",
studio_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmodstudio{dbg}");
}
} else {
let lib_suffix = Path::new(match triple.architecture {
Architecture::Arm(_) => "arm",
Architecture::Aarch64(_) => "arm64",
Architecture::X86_32(_) => "x86",
Architecture::X86_64 => "x86_64",
_ => whatever!("Unsupported architecture: {}", triple.architecture),
});
println!(
"cargo:rustc-link-search={}",
core_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmod{dbg}");
if cfg!(feature = "fsbank") {
println!(
"cargo:rustc-link-search={}",
fsbank_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fsbank{dbg}");
}
if cfg!(feature = "studio") {
println!(
"cargo:rustc-link-search={}",
studio_libs.join(lib_suffix).display()
);
println!("cargo:rustc-link-lib=fmodstudio{dbg}");
}
}
}
OperatingSystem::Ios => {
ios_like(
matches!(triple.environment, Environment::Sim),
"iphone",
&core_libs,
&studio_libs,
dbg,
)?;
}
OperatingSystem::Tvos => {
ios_like(
matches!(triple.environment, Environment::Sim),
"appletv",
&core_libs,
&studio_libs,
dbg,
)?;
}
_ => whatever!("Unexpected operating system: {}", triple.operating_system),
}
Ok(())
}
fn ios_like(
is_sim: bool,
infix: &str,
core_libs: &Path,
studio_libs: &Path,
dbg: &str,
) -> Result<(), Whatever> {
let sim = if is_sim { "simulator" } else { "" };
println!("cargo:rustc-link-search={}", core_libs.display());
println!("cargo:rustc-link-lib=static=fmod{dbg}:libfmod{dbg}_{infix}{sim}.a");
if cfg!(feature = "studio") {
println!("cargo:rustc-link-search={}", studio_libs.display());
println!("cargo:rustc-link-lib=static=fmodstudio{dbg}:libfmodstudio{dbg}_{infix}{sim}.a");
}
if cfg!(feature = "fsbank") {
whatever!("fsbank feature not supported on iOS and derivatives!");
}
Ok(())
}
#[snafu::report]
fn main() -> Result<(), Whatever> {
let fmod_dir = env::var("FMOD_DIR").whatever_context(
"Please set the environment variable FMOD_DIR to the root of the Fmod Engine SDK!",
)?;
let fmod_dir = Path::new(&fmod_dir);
println!("cargo:root={}", fmod_dir.display());
ensure_whatever!(fmod_dir.exists(), "The Fmod directory does not exist!");
ensure_whatever!(fmod_dir.is_dir(), "FMOD_DIR is not a directory!");
if !cfg!(feature = "mockall") {
handle_platform(fmod_dir)?;
}
let bindings_bld = BindingBuilder::default()
.header("src/bindgen.h")
.use_core()
.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
.prepend_enum_name(false)
.default_enum_style(bindgen::EnumVariation::NewType {
is_bitfield: false,
is_global: false,
})
.default_macro_constant_type(bindgen::MacroTypeVariation::Signed)
.blocklist_function("__va_start") // This symbol breaks builds on Windows, and is unneeded.
.blocklist_function("__report_gsfailure") // Likewise.
.clang_args(get_clang_args(fmod_dir)?);
let bindings_fns_only = bindings_bld
.clone()
.with_codegen_config(CodegenConfig::FUNCTIONS)
.generate()
.whatever_context("Could not generate function-only bindings!")?
.to_string();
let bindings_except_fns = bindings_bld
.ignore_functions()
.generate()
.whatever_context("Could not generate bindings without functions!")?
.to_string();
let bindings = &[
r#"#[cfg(feature = "mockall")]
use mockall::automock;
#[cfg_attr(feature = "mockall", automock)]
/// An artifact of mocking support.
/// All functions live in this module.
pub mod functions {
use super::*;
"#,
&bindings_fns_only,
"}\n",
&bindings_except_fns,
]
.join("");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("bindings.rs");
fs::write(out_path, bindings.as_bytes()).expect("Could not write bindings!");
Ok(())
}