Auto merge of #26352 - asajeffrey:webxr-glwindow-red-cyan, r=Manishearth

Add a pref for webxr glwindow anaglyphic red-cyan stereo

<!-- Please describe your changes on the following line: -->

Allows us to test out 3D content using old-skule glasses.

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because it's back end work

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5 files changed, 19 insertions, 6 deletions

diff --git a/Cargo.lock b/Cargo.lock
index bf1e2cf2331..8b68a7176a4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6428,7 +6428,7 @@ dependencies = [
 [[package]]
 name = "webxr"
 version = "0.0.1"
-source = "git+https://github.com/servo/webxr#eae68436697131122504b035746daa3a157b36b4"
+source = "git+https://github.com/servo/webxr#e1e935abacbef378efd3c5a676dfe63d4e5a6692"
 dependencies = [
  "android_injected_glue",
  "bindgen",
@@ -6451,7 +6451,7 @@ dependencies = [
 [[package]]
 name = "webxr-api"
 version = "0.0.1"
-source = "git+https://github.com/servo/webxr#eae68436697131122504b035746daa3a157b36b4"
+source = "git+https://github.com/servo/webxr#e1e935abacbef378efd3c5a676dfe63d4e5a6692"
 dependencies = [
  "euclid",
  "ipc-channel",
diff --git a/components/config/prefs.rs b/components/config/prefs.rs
index 25c59352693..b6f2030ad9c 100644
--- a/components/config/prefs.rs
+++ b/components/config/prefs.rs
@@ -297,8 +297,12 @@ mod gen {
                     enabled: bool,
                     #[serde(default)]
                     test: bool,
-                    #[serde(default)]
-                    glwindow: bool,
+                    glwindow: {
+                        #[serde(default)]
+                        enabled: bool,
+                        #[serde(rename = "dom.webxr.glwindow.red-cyan")]
+                        red_cyan: bool,
+                    },
                     hands: {
                         #[serde(default)]
                         enabled: bool,
diff --git a/ports/glutin/app.rs b/ports/glutin/app.rs
index 7b4adca6e28..e200015c8c9 100644
--- a/ports/glutin/app.rs
+++ b/ports/glutin/app.rs
@@ -54,7 +54,7 @@ impl App {
             ))
         };
 
-        let xr_discovery = if pref!(dom.webxr.glwindow) {
+        let xr_discovery = if pref!(dom.webxr.glwindow.enabled) {
             let window = window.clone();
             let surfman = window.webrender_surfman();
             let events_loop = events_loop.clone();
diff --git a/ports/glutin/headed_window.rs b/ports/glutin/headed_window.rs
index abfe328431a..d15520b2125 100644
--- a/ports/glutin/headed_window.rs
+++ b/ports/glutin/headed_window.rs
@@ -651,6 +651,14 @@ impl webxr::glwindow::GlWindow for XRWindow {
     fn get_translation(&self) -> Vector3D<f32, UnknownUnit> {
         self.pose.xr_translation.get().clone()
     }
+
+    fn get_mode(&self) -> webxr::glwindow::GlWindowMode {
+        if pref!(dom.webxr.glwindow.red_cyan) {
+            webxr::glwindow::GlWindowMode::StereoRedCyan
+        } else {
+            webxr::glwindow::GlWindowMode::StereoLeftRight
+        }
+    }
 }
 
 impl XRWindowPose {
diff --git a/resources/prefs.json b/resources/prefs.json
index 1d578ee74d6..61d24c83f65 100644
--- a/resources/prefs.json
+++ b/resources/prefs.json
@@ -33,7 +33,8 @@
   "dom.webvr.test": false,
   "dom.webvtt.enabled": false,
   "dom.webxr.enabled": true,
-  "dom.webxr.glwindow": true,
+  "dom.webxr.glwindow.enabled": true,
+  "dom.webxr.glwindow.red-cyan": false,
   "dom.webxr.hands.enabled": false,
   "dom.webxr.layers.enabled": false,
   "dom.webxr.test": false,