From 75e31f3f16dee54ded749a8536a06baed20ef212 Mon Sep 17 00:00:00 2001
From: wheaney <42350981+wheaney@users.noreply.github.com>
Date: Thu, 29 May 2025 14:04:38 -0700
Subject: [PATCH] WIP - initial XR effect stuff

---
 kwin/src/cubeeffect.cpp               | 28 ++++++++++++++++++++++++++-
 kwin/src/cubeeffect.h                 |  9 ++++++++-
 kwin/src/qml/CubeCameraController.qml | 14 +++++++++++---
 3 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/kwin/src/cubeeffect.cpp b/kwin/src/cubeeffect.cpp
index 5c436b7..dbce20b 100644
--- a/kwin/src/cubeeffect.cpp
+++ b/kwin/src/cubeeffect.cpp
@@ -8,6 +8,7 @@
 #include "cubeconfig.h"
 
 #include <QAction>
+#include <QFile>
 #include <QQuickItem>
 #include <QTimer>
 
@@ -46,6 +47,11 @@ CubeEffect::CubeEffect()
 
 
     reconfigure(ReconfigureAll);
+
+    m_xrRotationTimer = new QTimer(this);
+    m_xrRotationTimer->setInterval(16); // ~60Hz
+    connect(m_xrRotationTimer, &QTimer::timeout, this, &CubeEffect::updateXrRotation);
+    m_xrRotationTimer->start();
 }
 
 void CubeEffect::reconfigure(ReconfigureFlags)
@@ -272,4 +278,24 @@ void CubeEffect::setBackgroundColor(const QColor &color)
     }
 }
 
-} // namespace KWin
\ No newline at end of file
+QQuaternion CubeEffect::xrRotation() const {
+    return m_xrRotation;
+}
+
+void CubeEffect::updateXrRotation() {
+    // Example: Read quaternion from /dev/shm/breezy_xr_quat (float32[4], binary)
+    QFile shmFile("/dev/shm/breezy_xr_quat");
+    if (shmFile.open(QIODevice::ReadOnly)) {
+        float data[4];
+        if (shmFile.read(reinterpret_cast<char*>(data), sizeof(data)) == sizeof(data)) {
+            QQuaternion quat(data[3], data[0], data[1], data[2]); // w, x, y, z
+            if (quat != m_xrRotation) {
+                m_xrRotation = quat;
+                Q_EMIT xrRotationChanged();
+            }
+        }
+        shmFile.close();
+    }
+}
+
+} // namespace KWin
diff --git a/kwin/src/cubeeffect.h b/kwin/src/cubeeffect.h
index 9c09567..13b5802 100644
--- a/kwin/src/cubeeffect.h
+++ b/kwin/src/cubeeffect.h
@@ -25,6 +25,7 @@ class CubeEffect : public QuickSceneEffect
     Q_PROPERTY(QUrl skybox READ skybox NOTIFY skyboxChanged)
     Q_PROPERTY(BackgroundMode backgroundMode READ backgroundMode NOTIFY backgroundModeChanged)
     Q_PROPERTY(QColor backgroundColor READ backgroundColor NOTIFY backgroundColorChanged)
+    Q_PROPERTY(QQuaternion xrRotation READ xrRotation NOTIFY xrRotationChanged)
 
 public:
     enum class BackgroundMode {
@@ -64,10 +65,13 @@ public:
     QColor backgroundColor() const;
     void setBackgroundColor(const QColor &color);
 
+    QQuaternion xrRotation() const;
+
 public Q_SLOTS:
     void activate();
     void deactivate();
     void toggle();
+    void updateXrRotation();
 
 Q_SIGNALS:
     void cubeFaceDisplacementChanged();
@@ -78,6 +82,7 @@ Q_SIGNALS:
     void skyboxChanged();
     void backgroundModeChanged();
     void backgroundColorChanged();
+    void xrRotationChanged();
 
 protected:
     QVariantMap initialProperties(EffectScreen *screen) override;
@@ -98,6 +103,8 @@ private:
     int m_animationDuration = 200;
     bool m_mouseInvertedX = true;
     bool m_mouseInvertedY = true;
+    QQuaternion m_xrRotation;
+    QTimer *m_xrRotationTimer = nullptr;
 };
 
-} // namespace KWin
\ No newline at end of file
+} // namespace KWin
diff --git a/kwin/src/qml/CubeCameraController.qml b/kwin/src/qml/CubeCameraController.qml
index 473ca01..5bef1d7 100644
--- a/kwin/src/qml/CubeCameraController.qml
+++ b/kwin/src/qml/CubeCameraController.qml
@@ -93,12 +93,20 @@ Item {
         camera.rotation = root.rotation;
     }
 
+    // Add property to receive XR rotation from effect
+    property quaternion xrRotation: effect.xrRotation
+    property bool useXrRotation: true // Set to true to use XR rotation when available
+
     Timer {
         interval: 16
         repeat: true
-        running: root.busy
+        running: true
         onTriggered: {
-            processInputs();
+            if (useXrRotation && xrRotation.length() > 0) {
+                root.rotation = xrRotation;
+            } else if (root.busy) {
+                processInputs();
+            }
         }
     }
 
@@ -143,4 +151,4 @@ Item {
             }
         }
     }
-}
\ No newline at end of file
+}