diff --git a/examples/headless/src/main.rs b/examples/headless/src/main.rs
index c145d06..0397e5e 100644
--- a/examples/headless/src/main.rs
+++ b/examples/headless/src/main.rs
@@ -99,7 +99,6 @@ async fn render(mut scenes: SceneSet, index: usize, args: &Args) -> Result<()> {
         base_color: None,
     };
     (example_scene.function)(&mut builder, &mut scene_params);
-    builder.finish();
     let mut transform = Affine::IDENTITY;
     let (width, height) = if let Some(resolution) = scene_params.resolution {
         let ratio = resolution.x / resolution.y;
@@ -139,7 +138,6 @@ async fn render(mut scenes: SceneSet, index: usize, args: &Args) -> Result<()> {
     let mut scene = Scene::new();
     let mut builder = SceneBuilder::for_scene(&mut scene);
     builder.append(&fragment, Some(transform));
-    builder.finish();
     let size = Extent3d {
         width,
         height,
diff --git a/examples/with_bevy/src/main.rs b/examples/with_bevy/src/main.rs
index f98ce73..cbd24fd 100644
--- a/examples/with_bevy/src/main.rs
+++ b/examples/with_bevy/src/main.rs
@@ -103,7 +103,6 @@ impl ExtractComponent for VelloScene {
         let mut scene = Scene::default();
         let mut builder = SceneBuilder::for_scene(&mut scene);
         builder.append(&fragment.0, None);
-        builder.finish();
         Some(Self(scene, target.0.clone()))
     }
 }
diff --git a/examples/with_winit/src/main.rs b/examples/with_winit/src/main.rs
index a1ca03f..d1faa04 100644
--- a/examples/with_winit/src/main.rs
+++ b/examples/with_winit/src/main.rs
@@ -172,7 +172,6 @@ async fn run(event_loop: EventLoop<UserEvent>, window: Window, args: Args, mut s
                 base_color: None,
             };
             (example_scene.function)(&mut builder, &mut scene_params);
-            builder.finish();
 
             // If the user specifies a base color in the CLI we use that. Otherwise we use any
             // color specified by the scene. The default is black.
diff --git a/shader/shared/config.wgsl b/shader/shared/config.wgsl
index 7ab9ec6..1063134 100644
--- a/shader/shared/config.wgsl
+++ b/shader/shared/config.wgsl
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
 
+// This must be kept in sync with the struct in src/encoding/resolve.rs
 struct Config {
     width_in_tiles: u32,
     height_in_tiles: u32,
diff --git a/src/encoding/resolve.rs b/src/encoding/resolve.rs
index d1f8771..5c77c49 100644
--- a/src/encoding/resolve.rs
+++ b/src/encoding/resolve.rs
@@ -109,6 +109,9 @@ impl Layout {
 }
 
 /// Scene configuration.
+///
+/// This data structure must be kept in sync with the definition in
+/// shaders/shared/config.wgsl.
 #[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
 #[repr(C)]
 pub struct Config {
@@ -120,6 +123,8 @@ pub struct Config {
     pub target_width: u32,
     /// Height of the target in pixels.
     pub target_height: u32,
+    /// The base background color applied to the target before any blends.
+    pub base_color: u32,
     /// Layout of packed scene data.
     pub layout: Layout,
     /// Size of binning buffer allocation (in u32s).
diff --git a/src/render.rs b/src/render.rs
index 9cf93c3..4ad5083 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -3,9 +3,8 @@
 use bytemuck::{Pod, Zeroable};
 
 use crate::{
-    encoding::Encoding,
+    encoding::{Config, Encoding, Layout},
     engine::{BufProxy, ImageFormat, ImageProxy, Recording, ResourceProxy},
-    peniko::Color,
     shaders::{self, FullShaders, Shaders},
     RenderParams, Scene,
 };
@@ -43,7 +42,6 @@ const TAG_MONOID_FULL_SIZE: u64 = 20;
 const PATH_BBOX_SIZE: u64 = 24;
 const CUBIC_SIZE: u64 = 48;
 const DRAWMONOID_SIZE: u64 = 16;
-const MAX_DRAWINFO_SIZE: u64 = 44;
 const CLIP_BIC_SIZE: u64 = 8;
 const CLIP_EL_SIZE: u64 = 32;
 const CLIP_INP_SIZE: u64 = 8;
@@ -55,28 +53,6 @@ const BIN_HEADER_SIZE: u64 = 8;
 const TILE_SIZE: u64 = 8;
 const SEGMENT_SIZE: u64 = 24;
 
-// This data structure must be kept in sync with encoding::Config and the definition in
-// shaders/shared/config.wgsl.
-#[repr(C)]
-#[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
-struct Config {
-    width_in_tiles: u32,
-    height_in_tiles: u32,
-    target_width: u32,
-    target_height: u32,
-    base_color: u32,
-    n_drawobj: u32,
-    n_path: u32,
-    n_clip: u32,
-    bin_data_start: u32,
-    pathtag_base: u32,
-    pathdata_base: u32,
-    drawtag_base: u32,
-    drawdata_base: u32,
-    transform_base: u32,
-    linewidth_base: u32,
-}
-
 fn size_to_words(byte_size: usize) -> u32 {
     (byte_size / std::mem::size_of::<u32>()) as u32
 }
@@ -121,8 +97,11 @@ fn render(scene: &Scene, shaders: &Shaders) -> (Recording, BufProxy) {
         height_in_tiles: 64,
         target_width: 64 * 16,
         target_height: 64 * 16,
-        pathtag_base,
-        pathdata_base,
+        layout: Layout {
+            path_tag_base: pathtag_base,
+            path_data_base: pathdata_base,
+            ..Default::default()
+        },
         ..Default::default()
     };
     let scene_buf = recording.upload("scene", scene);