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|
use std::ptr;
use winapi::{
shared::{
dxgi,
minwindef::{HMODULE, UINT},
winerror,
},
um::{d3d11, d3d11_1, d3d11_2, d3dcommon},
};
use crate::auxil::dxgi::result::HResult;
type D3D11CreateDeviceFun = unsafe extern "system" fn(
*mut dxgi::IDXGIAdapter,
d3dcommon::D3D_DRIVER_TYPE,
HMODULE,
UINT,
*const d3dcommon::D3D_FEATURE_LEVEL,
UINT,
UINT,
*mut *mut d3d11::ID3D11Device,
*mut d3dcommon::D3D_FEATURE_LEVEL,
*mut *mut d3d11::ID3D11DeviceContext,
) -> d3d12::HRESULT;
pub(super) struct D3D11Lib {
// We use the os specific symbol to drop the lifetime parameter.
//
// SAFETY: we must ensure this outlives the Library.
d3d11_create_device: libloading::os::windows::Symbol<D3D11CreateDeviceFun>,
lib: libloading::Library,
}
impl D3D11Lib {
pub fn new() -> Option<Self> {
unsafe {
let lib = libloading::Library::new("d3d11.dll").ok()?;
let d3d11_create_device = lib
.get::<D3D11CreateDeviceFun>(b"D3D11CreateDevice")
.ok()?
.into_raw();
Some(Self {
lib,
d3d11_create_device,
})
}
}
pub fn create_device(
&self,
adapter: d3d12::DxgiAdapter,
) -> Option<(super::D3D11Device, d3dcommon::D3D_FEATURE_LEVEL)> {
let feature_levels = [
d3dcommon::D3D_FEATURE_LEVEL_11_1,
d3dcommon::D3D_FEATURE_LEVEL_11_0,
d3dcommon::D3D_FEATURE_LEVEL_10_1,
d3dcommon::D3D_FEATURE_LEVEL_10_0,
d3dcommon::D3D_FEATURE_LEVEL_9_3,
d3dcommon::D3D_FEATURE_LEVEL_9_2,
d3dcommon::D3D_FEATURE_LEVEL_9_1,
];
let mut device = d3d12::WeakPtr::<d3d11::ID3D11Device>::null();
let mut feature_level: d3dcommon::D3D_FEATURE_LEVEL = 0;
// We need to try this twice. If the first time fails due to E_INVALIDARG
// we are running on a machine without a D3D11.1 runtime, and need to
// retry without the feature level 11_1 feature level.
//
// Why they thought this was a good API, who knows.
let mut hr = unsafe {
(self.d3d11_create_device)(
adapter.as_mut_ptr() as *mut _,
d3dcommon::D3D_DRIVER_TYPE_UNKNOWN,
ptr::null_mut(), // software implementation DLL???
0, // flags
feature_levels.as_ptr(),
feature_levels.len() as u32,
d3d11::D3D11_SDK_VERSION,
device.mut_self(),
&mut feature_level,
ptr::null_mut(), // device context
)
};
// Try again without FL11_1
if hr == winerror::E_INVALIDARG {
hr = unsafe {
(self.d3d11_create_device)(
adapter.as_mut_ptr() as *mut _,
d3dcommon::D3D_DRIVER_TYPE_UNKNOWN,
ptr::null_mut(), // software implementation DLL???
0, // flags
feature_levels[1..].as_ptr(),
feature_levels[1..].len() as u32,
d3d11::D3D11_SDK_VERSION,
device.mut_self(),
&mut feature_level,
ptr::null_mut(), // device context
)
};
}
// Any errors here are real and we should complain about
if let Err(err) = hr.into_result() {
log::error!("Failed to make a D3D11 device: {}", err);
return None;
}
// We always try to upcast in highest -> lowest order
// Device -> Device2
unsafe {
match device.cast::<d3d11_2::ID3D11Device2>().into_result() {
Ok(device2) => {
device.destroy();
return Some((super::D3D11Device::Device2(device2), feature_level));
}
Err(hr) => {
log::info!("Failed to cast device to ID3D11Device2: {}", hr)
}
}
}
// Device -> Device1
unsafe {
match device.cast::<d3d11_1::ID3D11Device1>().into_result() {
Ok(device1) => {
device.destroy();
return Some((super::D3D11Device::Device1(device1), feature_level));
}
Err(hr) => {
log::info!("Failed to cast device to ID3D11Device1: {}", hr)
}
}
}
Some((super::D3D11Device::Device(device), feature_level))
}
}
|
