updated documentation and resources

crates/bevy_openxr/src/openxr/features/passthrough.rs

@@ -0,0 +1,59 @@
+use bevy::prelude::*;
+use openxr::sys::SystemPassthroughProperties2FB;
+use openxr::PassthroughCapabilityFlagsFB;
+
+use crate::resources::*;
+use crate::types::*;
+
+pub struct OxrPassthroughPlugin;
+
+impl Plugin for OxrPassthroughPlugin {
+    fn build(&self, _app: &mut App) {
+        todo!()
+    }
+}
+
+pub fn create_passthrough(
+    session: &OxrSession,
+    flags: openxr::PassthroughFlagsFB,
+    purpose: openxr::PassthroughLayerPurposeFB,
+) -> Result<(OxrPassthrough, OxrPassthroughLayer)> {
+    let passthrough = session.create_passthrough(flags)?;
+
+    let passthrough_layer = session.create_passthrough_layer(&passthrough, purpose)?;
+
+    Ok((passthrough, passthrough_layer))
+}
+
+#[inline]
+pub fn supports_passthrough(instance: &OxrInstance, system: OxrSystemId) -> Result<bool> {
+    unsafe {
+        let mut hand = openxr::sys::SystemPassthroughProperties2FB {
+            ty: SystemPassthroughProperties2FB::TYPE,
+            next: std::ptr::null(),
+            capabilities: PassthroughCapabilityFlagsFB::PASSTHROUGH_CAPABILITY,
+        };
+        let mut p = openxr::sys::SystemProperties::out(&mut hand as *mut _ as _);
+        cvt((instance.fp().get_system_properties)(
+            instance.as_raw(),
+            system.0,
+            p.as_mut_ptr(),
+        ))?;
+        bevy::log::info!(
+            "From supports_passthrough: Passthrough capabilities: {:?}",
+            hand.capabilities
+        );
+        Ok(
+            (hand.capabilities & PassthroughCapabilityFlagsFB::PASSTHROUGH_CAPABILITY)
+                == PassthroughCapabilityFlagsFB::PASSTHROUGH_CAPABILITY,
+        )
+    }
+}
+
+fn cvt(x: openxr::sys::Result) -> openxr::Result<openxr::sys::Result> {
+    if x.into_raw() >= 0 {
+        Ok(x)
+    } else {
+        Err(x)
+    }
+}