Factor out DEM texture creation into separate function

src/app/dem_renderer.rs

@@ -143,44 +143,7 @@ impl DemRenderer {
 
         let index_count = index_data.len();
 
-        let (dem_texture_view, dem_texture_size) = {
+        let (dem_texture_view, dem_texture_size) = load_dem_texture(&source, device, queue);
-            let texture_size = wgpu::Extent3d {
-                width: source.num_cells_x,
-                height: source.num_cells_y,
-                depth_or_array_layers: 1,
-            };
-            let texture = device.create_texture(&wgpu::TextureDescriptor {
-                label: Some("Dem Texture"),
-                size: texture_size,
-                mip_level_count: 1,
-                sample_count: 1,
-                dimension: wgpu::TextureDimension::D2,
-                format: wgpu::TextureFormat::R16Uint,
-                usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
-                view_formats: &[],
-            });
-
-            queue.write_texture(
-                wgpu::ImageCopyTexture {
-                    texture: &texture,
-                    mip_level: 0,
-                    origin: wgpu::Origin3d::ZERO,
-                    aspect: wgpu::TextureAspect::All,
-                },
-                bytemuck::cast_slice(&source.grid[..]),
-                wgpu::ImageDataLayout {
-                    offset: 0,
-                    bytes_per_row: Some(std::mem::size_of::<u16>() as u32 * source.num_cells_x),
-                    rows_per_image: Some(source.num_cells_y),
-                },
-                texture_size,
-            );
-
-            (
-                texture.create_view(&wgpu::TextureViewDescriptor::default()),
-                glam::UVec2::new(source.num_cells_x, source.num_cells_y),
-            )
-        };
 
         let camera = Camera::new(surface_config.width as f32 / surface_config.height as f32);
 
@@ -391,6 +354,49 @@ fn create_vertices(dem: &Rc<Dem>) -> (Vec<Vertex>, Vec<u16>) {
     (vertex_data.to_vec(), index_data.to_vec())
 }
 
+fn load_dem_texture(
+    source: &Dem,
+    device: &wgpu::Device,
+    queue: &wgpu::Queue,
+) -> (wgpu::TextureView, glam::UVec2) {
+    let texture_size = wgpu::Extent3d {
+        width: source.num_cells_x,
+        height: source.num_cells_y,
+        depth_or_array_layers: 1,
+    };
+    let texture = device.create_texture(&wgpu::TextureDescriptor {
+        label: Some("Dem Texture"),
+        size: texture_size,
+        mip_level_count: 1,
+        sample_count: 1,
+        dimension: wgpu::TextureDimension::D2,
+        format: wgpu::TextureFormat::R16Uint,
+        usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+        view_formats: &[],
+    });
+
+    queue.write_texture(
+        wgpu::ImageCopyTexture {
+            texture: &texture,
+            mip_level: 0,
+            origin: wgpu::Origin3d::ZERO,
+            aspect: wgpu::TextureAspect::All,
+        },
+        bytemuck::cast_slice(&source.grid[..]),
+        wgpu::ImageDataLayout {
+            offset: 0,
+            bytes_per_row: Some(std::mem::size_of::<u16>() as u32 * source.num_cells_x),
+            rows_per_image: Some(source.num_cells_y),
+        },
+        texture_size,
+    );
+
+    (
+        texture.create_view(&wgpu::TextureViewDescriptor::default()),
+        glam::UVec2::new(source.num_cells_x, source.num_cells_y),
+    )
+}
+
 fn get_animated_camera_position(animation_time: std::time::Duration, dem_size: f32) -> glam::Vec3 {
     let animation_phase = 2.0 * std::f32::consts::PI * (animation_time.as_secs_f32() % 10.0) / 10.0;
     glam::Vec3::new(