1 files changed, 69 insertions, 0 deletions
diff --git a/third_party/rust/ash/src/entry_libloading.rs b/third_party/rust/ash/src/entry_libloading.rs
new file mode 100644
index 0000000000..edf2e4eb3f
--- /dev/null
+++ b/third_party/rust/ash/src/entry_libloading.rs
@@ -0,0 +1,69 @@
+use crate::entry::EntryCustom;
+use libloading::Library;
+use std::error::Error;
+use std::fmt;
+use std::ptr;
+use std::sync::Arc;
+
+#[cfg(windows)]
+const LIB_PATH: &str = "vulkan-1.dll";
+
+#[cfg(all(
+    unix,
+    not(any(target_os = "macos", target_os = "ios", target_os = "android"))
+))]
+const LIB_PATH: &str = "libvulkan.so.1";
+
+#[cfg(target_os = "android")]
+const LIB_PATH: &str = "libvulkan.so";
+
+#[cfg(any(target_os = "macos", target_os = "ios"))]
+const LIB_PATH: &str = "libvulkan.dylib";
+
+/// Function loader
+pub type Entry = EntryCustom<Arc<Library>>;
+
+#[derive(Debug)]
+pub struct LoadingError(libloading::Error);
+
+impl fmt::Display for LoadingError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.0, f)
+    }
+}
+
+impl Error for LoadingError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        Error::source(&self.0)
+    }
+}
+
+impl EntryCustom<Arc<Library>> {
+    /// ```rust,no_run
+    /// use ash::{vk, Entry, version::EntryV1_0};
+    /// # fn main() -> Result<(), Box<std::error::Error>> {
+    /// let entry = Entry::new()?;
+    /// let app_info = vk::ApplicationInfo {
+    ///     api_version: vk::make_version(1, 0, 0),
+    ///     ..Default::default()
+    /// };
+    /// let create_info = vk::InstanceCreateInfo {
+    ///     p_application_info: &app_info,
+    ///     ..Default::default()
+    /// };
+    /// let instance = unsafe { entry.create_instance(&create_info, None)? };
+    /// # Ok(()) }
+    /// ```
+    pub fn new() -> Result<Entry, LoadingError> {
+        let lib = Library::new(&LIB_PATH)
+            .map_err(LoadingError)
+            .map(Arc::new)?;
+
+        Ok(Self::new_custom(lib, |vk_lib, name| unsafe {
+            vk_lib
+                .get(name.to_bytes_with_nul())
+                .map(|symbol| *symbol)
+                .unwrap_or(ptr::null_mut())
+        }))
+    }
+}