diff --git a/src/core/mask.rs b/src/core/mask.rs
index 3cdad7d..6a7c170 100644
--- a/src/core/mask.rs
+++ b/src/core/mask.rs
@@ -6,6 +6,7 @@ pub struct Masked {
 
 impl Widget for Masked {
     fn draw(&mut self, painter: &mut Painter) {
+        println!("yahoo! {}", painter.region());
         painter.set_mask(painter.region());
         painter.widget(&self.inner);
     }
diff --git a/src/render/shader.wgsl b/src/render/shader.wgsl
index 238b601..197d101 100644
--- a/src/render/shader.wgsl
+++ b/src/render/shader.wgsl
@@ -21,8 +21,18 @@ struct TextureInfo {
 }
 
 struct Mask {
-    top_left: UiVec2,
-    bot_right: UiVec2,
+    x: UiSpan,
+    y: UiSpan,
+}
+
+struct UiSpan {
+    start: UiScalar,
+    end: UiScalar,
+}
+
+struct UiScalar {
+    rel: f32,
+    abs: f32,
 }
 
 struct UiVec2 {
@@ -121,8 +131,11 @@ fn fs_main(
     }
     if in.mask_idx != 4294967295u {
         let mask = masks[in.mask_idx];
-        let top_left = floor(mask.top_left.rel * window.dim) + floor(mask.top_left.abs);
-        let bot_right = floor(mask.bot_right.rel * window.dim) + floor(mask.bot_right.abs);
+        let tl = UiVec2(vec2(mask.x.start.rel, mask.y.start.rel), vec2(mask.x.start.abs, mask.y.start.abs));
+        let br = UiVec2(vec2(mask.x.end.rel, mask.y.end.rel), vec2(mask.x.end.abs, mask.y.end.abs));
+
+        let top_left = floor(tl.rel * window.dim) + floor(tl.abs);
+        let bot_right = floor(br.rel * window.dim) + floor(br.abs);
         if pos.x < top_left.x || pos.x > bot_right.x || pos.y < top_left.y || pos.y > bot_right.y {
             color *= 0.0;
         }