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use std::{mem::size_of_val, sync::Arc};
use parking_lot::RwLock;
use windows::{
core::Interface as _,
Win32::{
Foundation,
Graphics::{Direct3D12, Dxgi},
},
};
use super::SurfaceTarget;
use crate::{auxil, dx12::D3D12Lib};
impl Drop for super::Instance {
fn drop(&mut self) {
if self.flags.contains(wgt::InstanceFlags::VALIDATION) {
auxil::dxgi::exception::unregister_exception_handler();
}
}
}
impl crate::Instance for super::Instance {
type A = super::Api;
unsafe fn init(desc: &crate::InstanceDescriptor) -> Result<Self, crate::InstanceError> {
profiling::scope!("Init DX12 Backend");
let lib_main = D3D12Lib::new().map_err(|e| {
crate::InstanceError::with_source(String::from("failed to load d3d12.dll"), e)
})?;
if desc
.flags
.intersects(wgt::InstanceFlags::VALIDATION | wgt::InstanceFlags::GPU_BASED_VALIDATION)
{
// Enable debug layer
if let Ok(Some(debug_controller)) = lib_main.debug_interface() {
if desc.flags.intersects(wgt::InstanceFlags::VALIDATION) {
unsafe { debug_controller.EnableDebugLayer() }
}
if desc
.flags
.intersects(wgt::InstanceFlags::GPU_BASED_VALIDATION)
{
#[allow(clippy::collapsible_if)]
if let Ok(debug1) = debug_controller.cast::<Direct3D12::ID3D12Debug1>() {
unsafe { debug1.SetEnableGPUBasedValidation(true) }
} else {
log::warn!("Failed to enable GPU-based validation");
}
}
}
}
let (lib_dxgi, factory) = auxil::dxgi::factory::create_factory(desc.flags)?;
// Create IDXGIFactoryMedia
let factory_media = lib_dxgi.create_factory_media().ok();
let mut supports_allow_tearing = false;
if let Some(factory5) = factory.as_factory5() {
let mut allow_tearing = Foundation::FALSE;
let hr = unsafe {
factory5.CheckFeatureSupport(
Dxgi::DXGI_FEATURE_PRESENT_ALLOW_TEARING,
<*mut _>::cast(&mut allow_tearing),
size_of_val(&allow_tearing) as u32,
)
};
match hr {
Err(err) => log::warn!("Unable to check for tearing support: {err}"),
Ok(()) => supports_allow_tearing = true,
}
}
// Initialize DXC shader compiler
let dxc_container = match desc.dx12_shader_compiler.clone() {
wgt::Dx12Compiler::Dxc {
dxil_path,
dxc_path,
} => {
let container = super::shader_compilation::get_dxc_container(dxc_path, dxil_path)
.map_err(|e| {
crate::InstanceError::with_source(String::from("Failed to load DXC"), e)
})?;
container.map(Arc::new)
}
wgt::Dx12Compiler::Fxc => None,
};
match dxc_container {
Some(_) => log::debug!("Using DXC for shader compilation"),
None => log::debug!("Using FXC for shader compilation"),
}
Ok(Self {
// The call to create_factory will only succeed if we get a factory4, so this is safe.
factory,
factory_media,
library: Arc::new(lib_main),
_lib_dxgi: lib_dxgi,
supports_allow_tearing,
flags: desc.flags,
dxc_container,
})
}
unsafe fn create_surface(
&self,
_display_handle: raw_window_handle::RawDisplayHandle,
window_handle: raw_window_handle::RawWindowHandle,
) -> Result<super::Surface, crate::InstanceError> {
match window_handle {
raw_window_handle::RawWindowHandle::Win32(handle) => Ok(super::Surface {
factory: self.factory.clone(),
factory_media: self.factory_media.clone(),
target: SurfaceTarget::WndHandle(Foundation::HWND(handle.hwnd.get() as *mut _)),
supports_allow_tearing: self.supports_allow_tearing,
swap_chain: RwLock::new(None),
}),
_ => Err(crate::InstanceError::new(format!(
"window handle {window_handle:?} is not a Win32 handle"
))),
}
}
unsafe fn enumerate_adapters(
&self,
_surface_hint: Option<&super::Surface>,
) -> Vec<crate::ExposedAdapter<super::Api>> {
let adapters = auxil::dxgi::factory::enumerate_adapters(self.factory.clone());
adapters
.into_iter()
.filter_map(|raw| {
super::Adapter::expose(raw, &self.library, self.flags, self.dxc_container.clone())
})
.collect()
}
}