Add support for XR_META_recommended_layer_resolution

openxr/src/lib.rs

@@ -43,6 +43,7 @@ mod passthrough;
 pub use passthrough::*;
 mod localization_map_ml;
 pub use localization_map_ml::*;
+mod recommended_layer_resolution_meta;
 
 pub use builder::{
     CompositionLayerBase, CompositionLayerCubeKHR, CompositionLayerCylinderKHR,

openxr/src/recommended_layer_resolution_meta.rs

@@ -0,0 +1,48 @@
+//! Implements the functions from [`XR_META_recommended_layer_resolution`].
+//!
+//! [`XR_META_recommended_layer_resolution`]: https://www.khronos.org/registry/OpenXR/specs/1.1/html/xrspec.html#XR_META_recommended_layer_resolution
+
+use crate::*;
+
+use std::ptr;
+
+impl<G: Graphics> Session<G> {
+    /// Requires [`XR_META_recommended_layer_resolution`]
+    ///
+    /// [`XR_META_recommended_layer_resolution`]: https://www.khronos.org/registry/OpenXR/specs/1.1/html/xrspec.html#XR_META_recommended_layer_resolution
+    pub fn get_recommended_layer_resolution(
+        &self,
+        display_time: Time,
+        layer: &CompositionLayerBase<'_, G>,
+    ) -> Result<Option<Extent2Di>> {
+        let ext = self
+            .inner
+            .instance
+            .exts()
+            .meta_recommended_layer_resolution
+            .as_ref()
+            .expect("XR_META_recommended_layer_resolution not loaded");
+
+        let resolution = unsafe {
+            let mut resolution = sys::RecommendedLayerResolutionMETA::out(ptr::null_mut());
+            let info = sys::RecommendedLayerResolutionGetInfoMETA {
+                ty: sys::RecommendedLayerResolutionGetInfoMETA::TYPE,
+                next: ptr::null(),
+                layer: layer as *const _ as *const _,
+                predicted_display_time: display_time,
+            };
+            cvt((ext.get_recommended_layer_resolution)(
+                self.as_raw(),
+                &info,
+                resolution.as_mut_ptr(),
+            ))?;
+            resolution.assume_init()
+        };
+
+        if resolution.is_valid.into() {
+            Ok(Some(resolution.recommended_image_dimensions))
+        } else {
+            Ok(None)
+        }
+    }
+}