Make it so the effect only applies to the glasses' display

kwin/src/qml/BreezyDesktop.qml

@@ -18,6 +18,12 @@ Node {
 
     property real viewportDiagonalFOVDegrees: effect.diagonalFOV
     property var viewportResolution: effect.displayResolution
+    property QtObject targetScreen
+    property bool targetScreenSupported: {
+        return supportedModels.some(function(model) {
+            return targetScreen.model.endsWith(model);
+        });
+    }
     property var screens: KWinComponents.Workspace.screens
     // .filter(function(screen) {
     //     return supportedModels.includes(screen.model);

kwin/src/qml/CameraController.qml

@@ -20,15 +20,21 @@ Item {
     implicitWidth: parent.width
     implicitHeight: parent.height
 
+    Displays {
+        id: displays
+    }
+
     function updateCamera(rotation) {
         camera.eulerRotation = rotation;
     }
 
     // how far to look ahead is how old the IMU data is plus a constant that is either the default for this device or an override
-    function lookAheadMS(imuDateMs, lookAheadConstant, override) {
+    function lookAheadMS(imuDateMs, lookAheadConfig, override) {
         // how stale the imu data is
         const dataAge = Date.now() - imuDateMs;
 
+        const lookAheadConstant = lookAheadConfig[0];
+        const lookAheadMultiplier = lookAheadConfig[1];
         return (override === -1 ? lookAheadConstant : override) + dataAge;
     }
 
@@ -54,7 +60,10 @@ Item {
 
     function updateFOV() {
         const aspectRatio = displayResolution[0] / displayResolution[1];
-        camera.fieldOfView = 2 * Math.atan(Math.tan(diagonalFOV * Math.PI / 360) / Math.sqrt(1 + aspectRatio * aspectRatio)) * 180 / Math.PI;
+        camera.fieldOfView = displays.radianToDegree(displays.diagonalToCrossFOVs(
+            displays.degreeToRadian(root.diagonalFOV),
+            aspectRatio
+        ).vertical);
     }
 
     onDisplayResolutionChanged: updateFOV();
@@ -68,7 +77,7 @@ Item {
                     root.imuRotations[0],
                     root.imuRotations[1],
                     root.imuTimeElapsedMs,
-                    lookAheadMS(root.imuTimestamp, root.lookAheadConfig[0], -1)
+                    lookAheadMS(root.imuTimestamp, root.lookAheadConfig, -1)
                 ));
             }
         }

kwin/src/qml/main.qml

@@ -11,7 +11,15 @@ Item {
     required property QtObject effect
     required property QtObject targetScreen
 
+    DesktopView {
+        id: desktopView
+        screen: root.targetScreen
+        width: root.targetScreen.geometry.width
+        height: root.targetScreen.geometry.height
+    }
+
     View3D {
+        id: view3D
         anchors.fill: parent
         environment: SceneEnvironment {
             antialiasingMode: SceneEnvironment.MSAA
@@ -24,6 +32,7 @@ Item {
 
         BreezyDesktop {
             id: breezyDesktop
+            targetScreen: root.targetScreen
         }
 
         CameraController {
@@ -33,5 +42,10 @@ Item {
         }
     }
     
-    Component.onCompleted: start();
+    // TODO - make it so the View3D isn't loaded unless it's a supported screen
+    Component.onCompleted: {
+        console.log(`Breezy -  initialized with target screen: ${breezyDesktop.targetScreen.model}, supported: ${breezyDesktop.targetScreenSupported}`);
+        view3D.opacity = breezyDesktop.targetScreenSupported ? 1.0 : 0.0;
+        desktopView.opacity = breezyDesktop.targetScreenSupported ? 0.0 : 1.0;
+    }
 }