Temporarily disable dynamic depth sort and chunk updates on wasm target.

This is a workaround for hadronized/luminance-rs#483

all-is-cubes/src/lum/space.rs

@@ -449,6 +449,8 @@ impl Chunk {
         let existing_tess_size_ok = if let Some(tess) = tess_option.as_ref() {
             tess.vert_nb() == new_triangulation.vertices().len()
                 && old_indices_len == new_triangulation.indices().len()
+                // TODO: workaround for https://github.com/phaazon/luminance-rs/issues/483
+                && !cfg!(target_arch = "wasm32")
         } else {
             false
         };
@@ -486,14 +488,20 @@ impl Chunk {
     }
 
     fn depth_sort_for_view(&mut self, view_position: Point3<FreeCoordinate>) {
-        let range = self.triangulation.transparent_range(DepthOrdering::Within);
-        if !range.is_empty() {
-            if let Some(tess) = &mut self.tess {
-                self.triangulation
-                    .depth_sort_for_view(view_position.map(|s| s as f32));
-                tess.indices_mut()
-                    .expect("failed to map indices for depth sorting")[range.clone()]
-                .copy_from_slice(&self.triangulation.indices()[range]);
+        // Disable dynamic depth sorting because luminance bug
+        // https://github.com/phaazon/luminance-rs/issues/483
+        // means indices_mut() can fail and corrupt other buffers.
+        // TODO: Reenble this and also in-place chunk updating when bug is fixed
+        if !cfg!(target_arch = "wasm32") {
+            let range = self.triangulation.transparent_range(DepthOrdering::Within);
+            if !range.is_empty() {
+                if let Some(tess) = &mut self.tess {
+                    self.triangulation
+                        .depth_sort_for_view(view_position.map(|s| s as f32));
+                    tess.indices_mut()
+                        .expect("failed to map indices for depth sorting")[range.clone()]
+                    .copy_from_slice(&self.triangulation.indices()[range]);
+                }
             }
         }
     }