remove once_cell dependency

Cargo.toml

@@ -10,7 +10,6 @@ keywords = ["libva", "video", "decode", "codec", "acceleration"]
 [dependencies]
 libloading = "0.8.0"
 bitflags = "2.3.2"
-once_cell = "1.13.1"
 raw-window-handle = { version = "0.5.0", features = ["alloc"] }
 log = "0.4.17"
 bytemuck = { version = "1.12.1", features = ["derive", "min_const_generics"] }

src/dlopen.rs

@@ -7,6 +7,7 @@
 use std::{
     ffi::c_void,
     os::raw::{c_char, c_float, c_int, c_uchar, c_uint},
+    sync::OnceLock,
 };
 
 use crate::{
@@ -23,8 +24,6 @@ use crate::{
     Entrypoint, Profile,
 };
 
-use once_cell::sync::OnceCell;
-
 /// `dylib! {}`
 macro_rules! dylib {
     (
@@ -64,9 +63,12 @@ macro_rules! dylib {
                 }
             }
 
-            pub fn get() -> Result<&'static Self, libloading::Error> {
-                static CELL: OnceCell<$strukt> = OnceCell::new();
-                CELL.get_or_try_init(Self::load)
+            pub fn get() -> Result<&'static Self, &'static libloading::Error> {
+                static CELL: OnceLock<Result<$strukt, libloading::Error>> = OnceLock::new();
+                match CELL.get_or_init(Self::load) {
+                    Ok(this) => Ok(this),
+                    Err(e) => Err(e),
+                }
             }
 
             $(

src/error.rs

@@ -87,7 +87,7 @@ impl VAError {
 
 pub(crate) enum Repr {
     Libva(&'static str, VAError),
-    Libloading(libloading::Error),
+    Libloading(&'static libloading::Error),
     Utf8Error(Utf8Error),
     TryFromIntError(TryFromIntError),
     Other(String),
@@ -117,8 +117,8 @@ impl From<Utf8Error> for Repr {
     }
 }
 
-impl From<libloading::Error> for Repr {
-    fn from(v: libloading::Error) -> Self {
+impl From<&'static libloading::Error> for Repr {
+    fn from(v: &'static libloading::Error) -> Self {
         Self::Libloading(v)
     }
 }