fix stereo mouse on apps

wayvr/src/overlays/screen/capture.rs

@@ -56,6 +56,7 @@ pub struct ScreenPipeline {
     offsetf: [f32; 2],
     transform: wlx_frame::Transform,
     stereo: StereoMode,
+    stereo_adjust_mouse: bool,
 }
 
 impl ScreenPipeline {
@@ -84,6 +85,7 @@ impl ScreenPipeline {
             offsetf,
             transform,
             stereo,
+            stereo_adjust_mouse: false,
         };
         me.ensure_stereo(stereo);
         Ok(me)
@@ -98,6 +100,10 @@ impl ScreenPipeline {
         self.pass.clear(); // ensure_depth will repopulate
     }
 
+    pub fn set_stereo_adjust_mouse(&mut self, adjust: bool) {
+        self.stereo_adjust_mouse = adjust;
+    }
+
     pub const fn transform(&self) -> wlx_frame::Transform {
         self.transform
     }
@@ -253,12 +259,22 @@ impl ScreenPipeline {
             let size = CURSOR_SIZE * self.extentf[1];
             let half_size = size * 0.5;
 
+            let (x_scale, y_scale) = if self.stereo_adjust_mouse {
+                match self.stereo {
+                    StereoMode::LeftRight | StereoMode::RightLeft => (2.0, 1.0),
+                    StereoMode::TopBottom | StereoMode::BottomTop => (1.0, 2.0),
+                    _ => (1.0, 1.0),
+                }
+            } else {
+                (1.0, 1.0)
+            };
+
             upload_quad_vertices(
                 &mut self.mouse.buf_vert,
                 self.extentf[0],
                 self.extentf[1],
-                mouse.x.mul_add(self.extentf[0], -half_size),
-                mouse.y.mul_add(self.extentf[1], -half_size),
+                mouse.x.mul_add(self.extentf[0] * x_scale, -half_size),
+                mouse.y.mul_add(self.extentf[1] * y_scale, -half_size),
                 size,
                 size,
             )?;

wayvr/src/overlays/wayvr.rs

@@ -343,25 +343,31 @@ impl WvrWindowBackend {
         self.interaction_transform = Some(ui_transform(meta.extent));
 
         let mut scale = vec2(
-            ((meta.extent[0] + BORDER_SIZE * 2) as f32) / (meta.extent[0] as f32),
-            ((meta.extent[1] + BORDER_SIZE * 2 + BAR_SIZE) as f32) / (meta.extent[1] as f32),
+            ((meta.extent[0] + BORDER_SIZE * 2) as f32) / meta.extent[0] as f32,
+            ((meta.extent[1] + BORDER_SIZE * 2 + BAR_SIZE) as f32) / meta.extent[1] as f32,
+        );
+
+        let mut translation = vec2(
+            -(BORDER_SIZE as f32) / meta.extent[0] as f32,
+            -((BORDER_SIZE + BAR_SIZE) as f32) / meta.extent[1] as f32,
         );
 
         if self.stereo_adjust_mouse
             && let Some(stereo) = self.stereo
         {
             match stereo {
-                StereoMode::LeftRight | StereoMode::RightLeft => scale.x *= 0.5,
-                StereoMode::TopBottom | StereoMode::BottomTop => scale.y *= 0.5,
+                StereoMode::LeftRight | StereoMode::RightLeft => {
+                    scale.x *= 0.5;
+                    translation.x *= 0.5;
+                }
+                StereoMode::TopBottom | StereoMode::BottomTop => {
+                    scale.y *= 0.5;
+                    translation.y *= 0.5;
+                }
                 _ => {}
             }
         }
 
-        let translation = vec2(
-            -(BORDER_SIZE as f32) / (meta.extent[0] as f32),
-            -((BORDER_SIZE + BAR_SIZE) as f32) / (meta.extent[1] as f32),
-        );
-
         self.mouse_transform = Affine2::from_scale_angle_translation(scale, 0.0, translation);
         self.uv_range = translation[0]..=(1.0 - translation[0]);
 
@@ -1022,6 +1028,9 @@ impl OverlayBackend for WvrWindowBackend {
                 if let Some(stereo) = self.stereo.as_mut() {
                     log::debug!("{}: stereo: {stereo:?} → {new:?}", self.name);
                     *stereo = new;
+                    if let Some(meta) = self.meta.clone() {
+                        let _ = self.apply_extent(app, &meta);
+                    }
                     if let Some(pipeline) = self.pipeline.as_mut() {
                         pipeline.ensure_stereo(new);
                     }
@@ -1040,6 +1049,9 @@ impl OverlayBackend for WvrWindowBackend {
                     let _ = self.apply_extent(app, &meta);
                     self.meta = Some(meta);
                 }
+                if let Some(pipeline) = self.pipeline.as_mut() {
+                    pipeline.set_stereo_adjust_mouse(new);
+                }
                 true
             }
             _ => false,