librashader/librashader-capi/src/ffi.rs
chyyran 2b250db353 capi: make _opt* structs more forwards compatible
yay another abi break 🙃
hopefully for the last time
2023-02-09 23:44:39 -05:00

133 lines
4.9 KiB
Rust

macro_rules! ffi_body {
($body:block) => {
{
let result: Result<(), $crate::error::LibrashaderError> = try {
$body
};
let Err(e) = result else {
return $crate::error::LibrashaderError::ok()
};
e.export()
}
};
(|$($ref_capture:ident),*|; mut |$($mut_capture:ident),*| $body:block) => {
{
$($crate::error::assert_non_null!($ref_capture);)*
$(let $ref_capture = unsafe { &*$ref_capture };)*
$($crate::error::assert_non_null!($mut_capture);)*
$(let $mut_capture = unsafe { &mut *$mut_capture };)*
let result: Result<(), $crate::error::LibrashaderError> = try {
$body
};
let Err(e) = result else {
return $crate::error::LibrashaderError::ok()
};
e.export()
}
};
(mut |$($mut_capture:ident),*| $body:block) => {
{
$($crate::error::assert_non_null!($mut_capture);)*
$(let $mut_capture = unsafe { &mut *$mut_capture };)*
let result: Result<(), $crate::error::LibrashaderError> = try {
$body
};
let Err(e) = result else {
return $crate::error::LibrashaderError::ok()
};
e.export()
}
};
(|$($ref_capture:ident),*| $body:block) => {
{
$($crate::error::assert_non_null!($ref_capture);)*
$(let $ref_capture = unsafe { &*$ref_capture };)*
let result: Result<(), $crate::error::LibrashaderError> = try {
$body
};
let Err(e) = result else {
return $crate::error::LibrashaderError::ok()
};
e.export()
}
}
}
macro_rules! extern_fn {
($(#[$($attrss:tt)*])* fn $func_name:ident ($($arg_name:ident : $arg_ty:ty),* $(,)?) $body:block) => {
::paste::paste! {
/// Function pointer definition for
#[doc = ::std::stringify!($func_name)]
pub type [<PFN_ $func_name>] = unsafe extern "C" fn($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t;
}
#[no_mangle]
$(#[$($attrss)*])*
pub unsafe extern "C" fn $func_name($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t {
$crate::ffi::ffi_body!($body)
}
};
($(#[$($attrss:tt)*])* raw fn $func_name:ident ($($arg_name:ident : $arg_ty:ty),* $(,)?) $body:block) => {
::paste::paste! {
/// Function pointer definition for
#[doc = ::std::stringify!($func_name)]
pub type [<PFN_ $func_name>] = unsafe extern "C" fn($($arg_name: $arg_ty,)* ) -> $crate::ctypes::libra_error_t;
}
#[no_mangle]
$(#[$($attrss)*])*
pub unsafe extern "C" fn $func_name($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t {
$body
}
};
($(#[$($attrss:tt)*])* fn $func_name:ident ($($arg_name:ident : $arg_ty:ty),* $(,)?) |$($ref_capture:ident),*|; mut |$($mut_capture:ident),*| $body:block) => {
::paste::paste! {
/// Function pointer definition for
#[doc = ::std::stringify!($func_name)]
pub type [<PFN_ $func_name>] = unsafe extern "C" fn($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t;
}
#[no_mangle]
$(#[$($attrss)*])*
pub unsafe extern "C" fn $func_name($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t {
$crate::ffi::ffi_body!(|$($ref_capture),*|; mut |$($mut_capture),*| $body)
}
};
($(#[$($attrss:tt)*])* fn $func_name:ident ($($arg_name:ident : $arg_ty:ty),* $(,)?) mut |$($mut_capture:ident),*| $body:block) => {
::paste::paste! {
/// Function pointer definition for
#[doc = ::std::stringify!($func_name)]
pub type [<PFN_ $func_name>] = unsafe extern "C" fn($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t;
}
#[no_mangle]
$(#[$($attrss)*])*
pub unsafe extern "C" fn $func_name($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t {
$crate::ffi::ffi_body!(mut |$($mut_capture),*| $body)
}
};
($(#[$($attrss:tt)*])* fn $func_name:ident ($($arg_name:ident : $arg_ty:ty),* $(,)?) |$($ref_capture:ident),*| $body:block) => {
::paste::paste! {
/// Function pointer definition for
#[doc = ::std::stringify!($func_name)]
pub type [<PFN_ $func_name>] = unsafe extern "C" fn($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t;
}
#[no_mangle]
$(#[$($attrss)*])*
pub unsafe extern "C" fn $func_name($($arg_name: $arg_ty,)*) -> $crate::ctypes::libra_error_t {
$crate::ffi::ffi_body!(|$($ref_capture),*| $body)
}
};
}
pub(crate) use extern_fn;
pub(crate) use ffi_body;