diff --git a/tests/SilkFX/res/layout/activity_glass.xml b/tests/SilkFX/res/layout/activity_glass.xml
index 85dab9315197a..a7b76bdeba092 100644
--- a/tests/SilkFX/res/layout/activity_glass.xml
+++ b/tests/SilkFX/res/layout/activity_glass.xml
@@ -67,6 +67,21 @@
         app:layout_constraintHorizontal_bias="1.0"
         app:layout_constraintStart_toStartOf="parent" />
 
+    <SeekBar
+        android:id="@+id/zoom"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:layout_marginEnd="12dp"
+        android:layout_marginStart="12dp"
+        android:min="-100"
+        android:max="100"
+        android:progress="-15"
+        app:layout_constraintBottom_toTopOf="@+id/blurRadiusTitle"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="1.0"
+        app:layout_constraintStart_toStartOf="parent" />
+
     <SeekBar
         android:id="@+id/blurRadius"
         android:layout_width="0dp"
@@ -75,7 +90,7 @@
         android:layout_marginEnd="12dp"
         android:layout_marginStart="12dp"
         android:max="150"
-        android:progress="50"
+        android:progress="20"
         app:layout_constraintBottom_toTopOf="@+id/materialOpacityTitle"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintHorizontal_bias="1.0"
@@ -131,6 +146,17 @@
         app:layout_constraintBottom_toTopOf="@+id/materialOpacity"
         app:layout_constraintStart_toStartOf="parent" />
 
+    <TextView
+        android:id="@+id/zoomTitle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginBottom="8dp"
+        android:text="Zoom"
+        android:textColor="@android:color/white"
+        app:layout_constraintBottom_toTopOf="@+id/zoom"
+        app:layout_constraintStart_toStartOf="parent" />
+
     <TextView
         android:id="@+id/blurRadiusTitle"
         android:layout_width="wrap_content"
@@ -200,7 +226,7 @@
         android:layout_marginStart="24dp"
         android:layout_marginBottom="8dp"
         android:text="Light Material"
-        app:layout_constraintBottom_toTopOf="@+id/blurRadiusTitle"
+        app:layout_constraintBottom_toTopOf="@+id/zoomTitle"
         app:layout_constraintStart_toStartOf="parent" />
 
     <TextView
@@ -212,6 +238,15 @@
         app:layout_constraintBottom_toBottomOf="@+id/blurRadiusTitle"
         app:layout_constraintStart_toEndOf="@+id/blurRadiusTitle" />
 
+    <TextView
+        android:id="@+id/zoomValue"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="TextView"
+        android:layout_marginLeft="8dp"
+        app:layout_constraintBottom_toBottomOf="@+id/zoomTitle"
+        app:layout_constraintStart_toEndOf="@+id/zoomTitle" />
+
     <TextView
         android:id="@+id/materialOpacityValue"
         android:layout_width="wrap_content"
diff --git a/tests/SilkFX/src/com/android/test/silkfx/materials/GlassActivity.kt b/tests/SilkFX/src/com/android/test/silkfx/materials/GlassActivity.kt
index 6f5ddacb27331..72b342c54d19e 100644
--- a/tests/SilkFX/src/com/android/test/silkfx/materials/GlassActivity.kt
+++ b/tests/SilkFX/src/com/android/test/silkfx/materials/GlassActivity.kt
@@ -39,11 +39,13 @@ class GlassActivity : Activity(), SeekBar.OnSeekBarChangeListener {
     lateinit var noiseOpacitySeekBar: SeekBar
     lateinit var materialOpacitySeekBar: SeekBar
     lateinit var scrimOpacitySeekBar: SeekBar
+    lateinit var zoomSeekBar: SeekBar
     lateinit var blurRadiusSeekBar: SeekBar
     lateinit var noiseOpacityValue: TextView
     lateinit var materialOpacityValue: TextView
     lateinit var scrimOpacityValue: TextView
     lateinit var blurRadiusValue: TextView
+    lateinit var zoomValue: TextView
 
     lateinit var background: Bitmap
 
@@ -58,12 +60,14 @@ class GlassActivity : Activity(), SeekBar.OnSeekBarChangeListener {
         materialView = requireViewById(R.id.materialView)
         materialOpacitySeekBar = requireViewById(R.id.materialOpacity)
         blurRadiusSeekBar = requireViewById(R.id.blurRadius)
+        zoomSeekBar = requireViewById(R.id.zoom)
         noiseOpacitySeekBar = requireViewById(R.id.noiseOpacity)
         scrimOpacitySeekBar = requireViewById(R.id.scrimOpacity)
         noiseOpacityValue = requireViewById(R.id.noiseOpacityValue)
         materialOpacityValue = requireViewById(R.id.materialOpacityValue)
         scrimOpacityValue = requireViewById(R.id.scrimOpacityValue)
         blurRadiusValue = requireViewById(R.id.blurRadiusValue)
+        zoomValue = requireViewById(R.id.zoomValue)
 
         background = BitmapFactory.decodeResource(resources, R.drawable.background1)
         backgroundView.setImageBitmap(background)
@@ -75,7 +79,7 @@ class GlassActivity : Activity(), SeekBar.OnSeekBarChangeListener {
         scrimOpacitySeekBar.setOnSeekBarChangeListener(this)
 
         arrayOf(blurRadiusSeekBar, materialOpacitySeekBar, noiseOpacitySeekBar,
-                scrimOpacitySeekBar).forEach {
+                scrimOpacitySeekBar, zoomSeekBar).forEach {
             it.setOnSeekBarChangeListener(this)
             onProgressChanged(it, it.progress, fromUser = false)
         }
@@ -104,6 +108,10 @@ class GlassActivity : Activity(), SeekBar.OnSeekBarChangeListener {
                 materialView.scrimOpacity = progress / seekBar.max.toFloat()
                 scrimOpacityValue.text = progress.toString()
             }
+            zoomSeekBar -> {
+                materialView.zoom = progress / seekBar.max.toFloat()
+                zoomValue.text = progress.toString()
+            }
             else -> throw IllegalArgumentException("Unknown seek bar")
         }
     }
diff --git a/tests/SilkFX/src/com/android/test/silkfx/materials/GlassView.kt b/tests/SilkFX/src/com/android/test/silkfx/materials/GlassView.kt
index e100959908c30..60797680b79ef 100644
--- a/tests/SilkFX/src/com/android/test/silkfx/materials/GlassView.kt
+++ b/tests/SilkFX/src/com/android/test/silkfx/materials/GlassView.kt
@@ -70,6 +70,12 @@ class GlassView(context: Context, attributeSet: AttributeSet) : View(context, at
             invalidate()
         }
 
+    var zoom = 0.0f
+        set(value) {
+            field = value
+            invalidate()
+        }
+
     var color = Color.BLACK
     set(value) {
         field = value
@@ -107,7 +113,12 @@ class GlassView(context: Context, attributeSet: AttributeSet) : View(context, at
     }
 
     override fun onDraw(canvas: Canvas?) {
-        src.set(left, top, right, bottom)
+        src.set(-width/2, -height/2, width/2, height/2)
+        src.scale(1.0f + zoom)
+        val centerX = left + width / 2
+        val centerY = top + height / 2
+        src.set(src.left + centerX, src.top + centerY, src.right + centerX, src.bottom + centerY)
+
         dst.set(0, 0, width, height)
         canvas?.drawBitmap(backgroundBitmap, src, dst, blurPaint)
         canvas?.drawRect(dst, materialPaint)