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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//! Completed faceted-BREP signatures shared across one model's routers.
use super::*;
/// Model-scoped memo of completed fast BREP signatures, keyed by express id.
/// Create a fresh cache for every source/model; identical ids in different
/// models must never share this cache. Quality, scale and RTC are folded later.
#[derive(Clone, Default)]
pub struct SharedBrepSignatureCache(Arc<Mutex<FxHashMap<u32, u128>>>);
impl GeometryRouter {
/// Create a fresh signature cache for ONE immutable loaded model.
pub fn new_brep_signature_cache() -> SharedBrepSignatureCache {
SharedBrepSignatureCache::default()
}
/// Reuse completed BREP signatures across routers of the SAME source model.
/// Attach a fresh cache when replacing the source, just like the item cache.
pub fn enable_shared_brep_signature_cache(&mut self, cache: SharedBrepSignatureCache) {
self.shared_brep_signatures = Some(cache);
}
fn brep_key_with_params(&self, structural: u128) -> u128 {
super::content_hash::key_with_params(structural, self.tessellation_quality.to_index(), self.unit_scale, self.rtc_offset)
}
/// Cache key for an item: its structural hash combined with the router params
/// that change the meshed output (tessellation quality / unit scale / RTC), or
/// `None` when dedup is disabled (skips the hash walk so disabled = zero
/// overhead). The quality fold is what keeps `setTessellationQuality` correct —
/// the shared cache persists across quality changes on a worker, so the key
/// must distinguish them (#976).
pub(super) fn item_dedup_key(&self, item: &DecodedEntity, decoder: &mut EntityDecoder) -> Option<u128> {
self.item_dedup_cache.as_ref()?;
// Keep the proven default types; mapped items have their own cache.
let base = matches!(
item.ifc_type,
IfcType::IfcFacetedBrep
| IfcType::IfcBooleanResult
| IfcType::IfcBooleanClippingResult
| IfcType::IfcExtrudedAreaSolid
);
// Additive, flagged OFF by default: faceset / surface-model families. Their
// generic byte signature (`sig_walk_bytes`) is already complete; gated so a
// low-reuse model never pays the hash for no payback (the #1177 trap).
let extra = Self::build_dedup_extra_enabled()
&& matches!(
item.ifc_type,
IfcType::IfcPolygonalFaceSet
| IfcType::IfcTriangulatedFaceSet
| IfcType::IfcShellBasedSurfaceModel
| IfcType::IfcFaceBasedSurfaceModel
);
if !(base || extra) {
return None;
}
// #1909: retain the large-BREP bypass. A completed shared hit already
// passed this threshold and can skip even the face-count traversal.
if item.ifc_type == IfcType::IfcFacetedBrep {
if let Some(cache) = &self.shared_brep_signatures {
let hit = cache.0.lock().unwrap_or_else(|e| e.into_inner()).get(&item.id).copied();
if let Some(signature) = hit {
return Some(self.brep_key_with_params(signature));
}
}
if let Some(face_count) = super::content_hash::faceted_brep_face_count(decoder, item.id) {
if face_count > super::content_hash::FACETED_BREP_DEDUP_FACE_LIMIT {
return None;
}
}
}
// Only a completed fast BREP walk is context-independent. Never publish
// generic recursive hashes, depth cutoffs, cycle sentinels or refusals.
if item.ifc_type == IfcType::IfcFacetedBrep {
if let Some(cache) = &self.shared_brep_signatures {
if super::content_hash::is_faceted_brep(decoder, item.id) {
if let Some(signature) = super::content_hash::try_faceted_brep_signature(decoder, item.id) {
self.content_sig_memo.borrow_mut().insert(item.id, signature);
cache.0.lock().unwrap_or_else(|e| e.into_inner()).insert(item.id, signature);
return Some(self.brep_key_with_params(signature));
}
}
let mut memo = self.content_sig_memo.borrow_mut();
let mut refused = self.content_hash_oversized_ref_drops.borrow_mut();
let signature = super::content_hash::item_signature_after_failed_brep(decoder, item.id, &mut memo, &mut refused);
return Some(self.brep_key_with_params(signature));
}
}
let structural = {
let mut memo = self.content_sig_memo.borrow_mut();
let mut refused = self.content_hash_oversized_ref_drops.borrow_mut();
super::content_hash::item_signature(decoder, item.id, &mut memo, &mut refused)
};
Some(super::content_hash::key_with_params(
structural,
self.tessellation_quality.to_index(),
self.unit_scale,
self.rtc_offset,
))
}
}
#[cfg(test)]
#[path = "brep_signatures_tests.rs"]
mod tests;