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Dynamically detect D3D12 feature level

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This commit is contained in:
Charlton Rodda
2023-12-10 02:57:03 +00:00
parent 7502fc16ea
commit 91a4f2a544
1 changed files with 50 additions and 9 deletions
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59
src/graphics/d3d12.rs
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@@ -108,16 +108,8 @@ pub fn initialize_xr_instance(
}
};
// wgpu hardcodes this, so we'll hardcode it here too
let d3d_target_version: u32 = d3dcommon::D3D_FEATURE_LEVEL_11_0;
let reqs = xr_instance.graphics_requirements::<xr::D3D12>(xr_system_id)?;
if (d3d_target_version) < (reqs.min_feature_level as u32) {
panic!(
"OpenXR runtime requires D3D12 feature level >= {}",
reqs.min_feature_level
);
}
let instance_descriptor = &wgpu_hal::InstanceDescriptor {
name: &app_info.name,
dx12_shader_compiler: wgpu::util::dx12_shader_compiler_from_env().unwrap_or_default(),
@@ -162,6 +154,26 @@ pub fn initialize_xr_instance(
.open(wgpu_features, &wgpu_limits)?
};
let device_supported_feature_level: d3d12::FeatureLevel =
get_device_feature_level(wgpu_open_device.device.raw_device());
if (device_supported_feature_level as u32) < (reqs.min_feature_level as u32) {
panic!(
"OpenXR runtime requires D3D12 feature level >= {}",
reqs.min_feature_level
);
}
let (session, frame_wait, frame_stream) = unsafe {
xr_instance.create_session::<xr::D3D12>(
xr_system_id,
&xr::d3d::SessionCreateInfoD3D12 {
device: wgpu_open_device.device.raw_device().as_mut_ptr().cast(),
queue: wgpu_open_device.device.raw_queue().as_mut_ptr().cast(),
},
)
}?;
let wgpu_adapter = unsafe { wgpu_instance.create_adapter_from_hal(wgpu_exposed_adapter) };
let raw_device = wgpu_open_device.device.raw_device().as_mut_ptr();
let raw_queue = wgpu_open_device.device.raw_queue().as_mut_ptr();
@@ -338,6 +350,35 @@ pub fn start_xr_session(
))
}
// Extracted from https://github.com/gfx-rs/wgpu/blob/1161a22f4fbb4fc204eb06f2ac4243f83e0e980d/wgpu-hal/src/dx12/adapter.rs#L73-L94
// license: MIT OR Apache-2.0
fn get_device_feature_level(
device: &d3d12::ComPtr<winapi_d3d12::ID3D12Device>,
) -> d3d12::FeatureLevel {
// Detect the highest supported feature level.
let d3d_feature_level = [
d3d12::FeatureLevel::L12_1,
d3d12::FeatureLevel::L12_0,
d3d12::FeatureLevel::L11_1,
d3d12::FeatureLevel::L11_0,
];
type FeatureLevelsInfo = winapi_d3d12::D3D12_FEATURE_DATA_FEATURE_LEVELS;
let mut device_levels: FeatureLevelsInfo = unsafe { std::mem::zeroed() };
device_levels.NumFeatureLevels = d3d_feature_level.len() as u32;
device_levels.pFeatureLevelsRequested = d3d_feature_level.as_ptr().cast();
unsafe {
device.CheckFeatureSupport(
winapi_d3d12::D3D12_FEATURE_FEATURE_LEVELS,
(&mut device_levels as *mut FeatureLevelsInfo).cast(),
std::mem::size_of::<FeatureLevelsInfo>() as _,
)
};
// This cast should never fail because we only requested feature levels that are already in the enum.
let max_feature_level = d3d12::FeatureLevel::try_from(device_levels.MaxSupportedFeatureLevel)
.expect("Unexpected feature level");
max_feature_level
}
fn wgpu_to_d3d12(format: wgpu::TextureFormat) -> Option<DXGI_FORMAT> {
// Copied wholesale from:
// https://github.com/gfx-rs/wgpu/blob/v0.19/wgpu-hal/src/auxil/dxgi/conv.rs#L12-L94