ash/src/entry.rs

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Rust
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use prelude::*;
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use std::mem;
use std::ptr;
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use vk;
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use instance::Instance;
use shared_library::dynamic_library::DynamicLibrary;
use std::path::Path;
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#[cfg(windows)]
fn get_path() -> &'static Path {
Path::new("vulkan-1.dll")
}
#[cfg(all(unix, not(target_os = "android")))]
fn get_path() -> &'static Path {
Path::new("libvulkan.so.1")
}
#[cfg(target_os = "android")]
fn get_path() -> &'static Path {
Path::new("libvulkan.so")
}
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lazy_static!{
static ref VK_LIB: Result<DynamicLibrary, String> = DynamicLibrary::open(Some(get_path()));
}
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pub struct Entry {
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pub static_fn: vk::StaticFn,
pub entry_fn: vk::EntryFn,
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}
#[derive(Debug)]
pub enum LoadingError {
LibraryLoadFailure(String),
StaticLoadError(String),
EntryLoadError(String),
}
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#[derive(Debug)]
pub enum InstanceError {
LoadError(String),
VkError(vk::Result),
}
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impl Entry {
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pub fn load_vulkan() -> Result<Entry, LoadingError> {
let static_fn = match *VK_LIB {
Ok(ref lib) => {
let static_fn = vk::StaticFn::load(|name| unsafe {
let name = name.to_str().unwrap();
let f = match lib.symbol(name) {
Ok(s) => s,
Err(_) => ptr::null(),
};
f
}).map_err(|err| LoadingError::StaticLoadError(err))?;
Ok(static_fn)
}
Err(ref err) => Err(LoadingError::LibraryLoadFailure(err.clone())),
}?;
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let entry_fn = vk::EntryFn::load(|name| unsafe {
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mem::transmute(static_fn.get_instance_proc_addr(ptr::null_mut(), name.as_ptr()))
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}).map_err(|err| LoadingError::EntryLoadError(err))?;
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Ok(Entry {
static_fn: static_fn,
entry_fn: entry_fn,
})
}
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pub fn create_instance(&self,
create_info: &vk::InstanceCreateInfo)
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-> Result<Instance, InstanceError> {
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unsafe {
let mut instance: vk::Instance = mem::uninitialized();
let err_code = self.entry_fn.create_instance(create_info, ptr::null(), &mut instance);
if err_code != vk::Result::Success {
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return Err(InstanceError::VkError(err_code));
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}
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let instance_fn = vk::InstanceFn::load(|name| {
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mem::transmute(self.static_fn.get_instance_proc_addr(instance, name.as_ptr()))
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}).map_err(|err| InstanceError::LoadError(err))?;
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Ok(Instance::from_raw(instance, instance_fn))
}
}
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pub fn enumerate_instance_layer_properties(&self) -> VkResult<Vec<vk::LayerProperties>> {
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unsafe {
let mut num = 0;
self.entry_fn.enumerate_instance_layer_properties(&mut num, ptr::null_mut());
let mut v = Vec::with_capacity(num as usize);
let err_code = self.entry_fn
.enumerate_instance_layer_properties(&mut num, v.as_mut_ptr());
v.set_len(num as usize);
match err_code {
vk::Result::Success => Ok(v),
_ => Err(err_code),
}
}
}
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pub fn enumerate_instance_extension_properties(&self)
-> VkResult<Vec<vk::ExtensionProperties>> {
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unsafe {
let mut num = 0;
self.entry_fn
.enumerate_instance_extension_properties(ptr::null(), &mut num, ptr::null_mut());
let mut data = Vec::with_capacity(num as usize);
let err_code = self.entry_fn
.enumerate_instance_extension_properties(ptr::null(), &mut num, data.as_mut_ptr());
data.set_len(num as usize);
match err_code {
vk::Result::Success => Ok(data),
_ => Err(err_code),
}
}
}
pub fn get_instance_proc_addr(&self,
instance: vk::Instance,
p_name: *const vk::c_char)
-> vk::PFN_vkVoidFunction {
unsafe { self.static_fn.get_instance_proc_addr(instance, p_name) }
}
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}