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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())
}))
}
}
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