diff --git a/.gitmodules b/.gitmodules
index e7a2906..3bfc2c5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -8,6 +8,7 @@
 [submodule "modules/sombrero"]
 	path = modules/sombrero
 	url = https://github.com/wheaney/sombrero.git
+	branch = breezy_sbs
 [submodule "ui/modules/PyXRLinuxDriverIPC"]
 	path = ui/modules/PyXRLinuxDriverIPC
 	url = https://github.com/wheaney/PyXRLinuxDriverIPC.git
diff --git a/gnome/bin/dev/use_local_extension.sh b/gnome/bin/dev/use_local_extension.sh
index 54e9577..512e2b7 100755
--- a/gnome/bin/dev/use_local_extension.sh
+++ b/gnome/bin/dev/use_local_extension.sh
@@ -6,6 +6,7 @@ SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
 if [ -z "$XDG_DATA_HOME" ]; then
   XDG_DATA_HOME="$USER_HOME/.local/share"
 fi
+DATA_DIR="$XDG_DATA_HOME/breezy_gnome"
 
 # if $XDG_DATA_HOME/gnome-shell/extensions/breezydesktop@xronlinux.com exists
 extension_path="$XDG_DATA_HOME/gnome-shell/extensions/breezydesktop@xronlinux.com"
@@ -17,4 +18,12 @@ fi
 # recursively copy the $SCRIPT_DIR/../../src to extension_path, don't preserve symlinks
 cp -rL $SCRIPT_DIR/../../src $extension_path
 
-glib-compile-schemas $extension_path/schemas
\ No newline at end of file
+glib-compile-schemas $extension_path/schemas
+
+pushd $extension_path
+GNOME_MANIFEST_LINE=$(find -L . -type f ! -name "*.compiled" -exec sha256sum {} \; | sort | sha256sum | sed 's/ .*//')
+popd
+
+pushd $DATA_DIR
+echo -e "$GNOME_MANIFEST_LINE breezydesktop@xronlinux.com" > manifest
+popd
\ No newline at end of file
diff --git a/gnome/src/xrEffect.js b/gnome/src/xrEffect.js
index 0c0b15b..a9cceec 100644
--- a/gnome/src/xrEffect.js
+++ b/gnome/src/xrEffect.js
@@ -50,20 +50,20 @@ const shaderUniformLocations = {
     'imu_quat_data': null,
     'look_ahead_cfg': null,
     'look_ahead_ms': null,
-    'stage_aspect_ratio': null,
-    'display_aspect_ratio': null,
     'trim_width_percent': null,
     'trim_height_percent': null,
-    'display_zoom': null,
+    'display_size': null,
     'display_north_offset': null,
     'lens_distance_ratio': null,
     'sbs_enabled': null,
     'sbs_content': null,
+    'sbs_mode_stretched': null,
     'custom_banner_enabled': null,
     'half_fov_z_rads': null,
     'half_fov_y_rads': null,
-    'screen_distance': null,
-    'display_res': null
+    'source_resolution': null,
+    'display_resolution': null,
+    'curved': null
 };
 
 function setUniformFloat(effect, locationName, dataViewInfo, value) {
@@ -119,22 +119,19 @@ function setIntermittentUniformVariables() {
         const imuData = dataViewFloatArray(dataView, IMU_QUAT_DATA);
         const imuResetState = validKeepalive && imuData[0] === 0.0 && imuData[1] === 0.0 && imuData[2] === 0.0 && imuData[3] === 1.0;
         const enabled = dataViewUint8(dataView, ENABLED) !== 0 && version === DATA_LAYOUT_VERSION && validKeepalive;
+        const displayRes = dataViewUintArray(dataView, DISPLAY_RES);
 
         if (enabled) {
-            const displayRes = dataViewUintArray(dataView, DISPLAY_RES);
             const displayFov = dataViewFloat(dataView, DISPLAY_FOV);
-            const lensDistanceRatio = dataViewFloat(dataView, LENS_DISTANCE_RATIO);
 
             // compute these values once, they only change when the XR device changes
             const displayAspectRatio = displayRes[0] / displayRes[1];
-            const stageAspectRatio = this.target_monitor.width / this.target_monitor.height;
-            const diagToVertRatio = Math.sqrt(Math.pow(stageAspectRatio, 2) + 1);
+            const diagToVertRatio = Math.sqrt(Math.pow(displayAspectRatio, 2) + 1);
             const halfFovZRads = degreeToRadian(displayFov / diagToVertRatio) / 2;
-            const halfFovYRads = halfFovZRads * stageAspectRatio;
-            const screenDistance = 1.0 - lensDistanceRatio;
+            const halfFovYRads = halfFovZRads * displayAspectRatio;
 
             // our overlay doesn't quite cover the full screen texture, which allows us to see some of the real desktop
-            // underneath, so we trim two pixels around the entire edge of the texture
+            // underneath, so we trim three pixels around the entire edge of the texture
             const trimWidthPercent = 3.0 / this.target_monitor.width;
             const trimHeightPercent = 3.0 / this.target_monitor.height;
             
@@ -143,26 +140,26 @@ function setIntermittentUniformVariables() {
             transferUniformFloat(this, 'lens_distance_ratio', dataView, LENS_DISTANCE_RATIO);
 
             // computed values with no dataViewInfo, so we set these manually
-            setSingleFloat(this, 'stage_aspect_ratio', stageAspectRatio);
-            setSingleFloat(this, 'display_aspect_ratio', displayAspectRatio);
             setSingleFloat(this, 'trim_width_percent', trimWidthPercent);
             setSingleFloat(this, 'trim_height_percent', trimHeightPercent);
             setSingleFloat(this, 'half_fov_z_rads', halfFovZRads);
             setSingleFloat(this, 'half_fov_y_rads', halfFovYRads);
-            setSingleFloat(this, 'screen_distance', screenDistance);
 
-            // TOOD - drive from settings
-            setSingleFloat(this, 'display_zoom', 1.0);
+            // TODO - drive from settings
+            setSingleFloat(this, 'display_size', 1.0);
         }
 
         // these variables are always in play, even if enabled is false
         setSingleFloat(this, 'enabled', enabled ? 1.0 : 0.0);
         setSingleFloat(this, 'show_banner', imuResetState ? 1.0 : 0.0);
-        setSingleFloat(this, 'sbs_content', 0.0); // TOOD - drive from settings
+        setSingleFloat(this, 'sbs_content', 0.0); // TODO - drive from settings
+        setSingleFloat(this, 'sbs_mode_stretched', 1.0); // content always fills the whole display
         setSingleFloat(this, 'sbs_enabled', dataViewUint8(dataView, SBS_ENABLED) !== 0 ? 1.0 : 0.0);
         setSingleFloat(this, 'custom_banner_enabled', dataViewUint8(dataView, CUSTOM_BANNER_ENABLED) !== 0 ? 1.0 : 0.0);
+        setSingleFloat(this, 'curved', 1.0); // TODO - drive from settings
 
-        this.set_uniform_float(shaderUniformLocations['display_res'], 2, [this.target_monitor.width, this.target_monitor.height]);
+        this.set_uniform_float(shaderUniformLocations['display_resolution'], 2, displayRes);
+        this.set_uniform_float(shaderUniformLocations['source_resolution'], 2, [this.target_monitor.width, this.target_monitor.height]);
     } else if (dataView.byteLength !== 0) {
         Globals.logger.log(`ERROR: Invalid dataView.byteLength: ${dataView.byteLength} !== ${DATA_VIEW_LENGTH}`)
     }
diff --git a/modules/sombrero b/modules/sombrero
index 17ebe10..b45a3d9 160000
--- a/modules/sombrero
+++ b/modules/sombrero
@@ -1 +1 @@
-Subproject commit 17ebe10ad9a006cd6a51d5705d6ceddca4464369
+Subproject commit b45a3d9c925681aa8b70bbc38ad6919750b16e6d