Delta-sync: emit only nodes whose dirty_flags are non-zero, and clear flags on the nodes we report. Swift calls this once per frame and applies the reported changes — static scenes get O(0) cost, moving scenes scale with the number of actually-changing nodes.
(dst: *mut SceneNodeInfo, max: i64)
| 349 | /// applies the reported changes — static scenes get O(0) cost, moving |
| 350 | /// scenes scale with the number of actually-changing nodes. |
| 351 | pub fn drain_dirty(dst: *mut SceneNodeInfo, max: i64) -> i64 { |
| 352 | if dst.is_null() || max <= 0 { return 0; } |
| 353 | with(|inner| { |
| 354 | let mut written = 0i64; |
| 355 | for (i, slot) in inner.nodes.iter_mut().enumerate() { |
| 356 | if written >= max { break; } |
| 357 | let Some(n) = slot else { continue }; |
| 358 | if n.dirty_flags == 0 { continue; } |
| 359 | let info = SceneNodeInfo { |
| 360 | dirty_flags: n.dirty_flags, |
| 361 | handle: i as u32, |
| 362 | parent: n.parent, |
| 363 | visible: if n.visible { 1 } else { 0 }, |
| 364 | geometry_version: n.geometry_version, |
| 365 | color: n.color, |
| 366 | roughness: n.roughness, |
| 367 | metalness: n.metalness, |
| 368 | texture: n.texture, |
| 369 | has_geometry: if n.indices.is_empty() { 0 } else { 1 }, |
| 370 | transform: n.transform, |
| 371 | tex_base_color: n.tex_base_color, |
| 372 | tex_normal: n.tex_normal, |
| 373 | tex_metallic_roughness: n.tex_metallic_roughness, |
| 374 | tex_emissive: n.tex_emissive, |
| 375 | tex_occlusion: n.tex_occlusion, |
| 376 | skin_version: n.skin_version, |
| 377 | }; |
| 378 | unsafe { *dst.add(written as usize) = info; } |
| 379 | n.dirty_flags = 0; |
| 380 | written += 1; |
| 381 | } |
| 382 | written |
| 383 | }) |
| 384 | } |
| 385 | |
| 386 | /// Drain the list of handles destroyed since the last call. Swift pulls |
| 387 | /// these and removes the matching SCNNodes from its retainedNodes map. |
no test coverage detected