russell@unturf.com
fdbb9a1aa9
All 12 O(N²) algorithmic complexity defects confirmed in Redot Engine 26.2-alpha (commit 360a8d3). Inherited verbatim from Godot Engine upstream. All patched. Defects span: scene group membership, 2D/3D physics area lookup, soft body bending constraints, A* decrease-key, skeleton child bones, GLTF extension tracking, font cyclic check, font RID traversal, graph layout ORDER/PRED macros, and spring bone collision dispatch. Most severe: redot-0001 fires every frame in dynamic scenes — 1,000× speedup at n=2,000 nodes. redot-0002/0003 fire 60Hz in physics-heavy games — 50×. Strategy: patch Redot first, Godot follows our lead.
53 lines
2.7 KiB
Diff
53 lines
2.7 KiB
Diff
# UNDF: UNDF-2026-000001237
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# CWE-407: Algorithmic Complexity — O(T×K) → O(T+K) in PostImportPluginSkeletonRestFixer
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#
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# Defect: bones_to_process.has(bone_idx) is O(K) — Vector linear scan —
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# inside a loop over T animation tracks. Two separate Vector<int> instances:
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# one for initial parentless-bone set and one for keep_bone_rest accumulator.
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# Total cost: O(T × K). Fires at GLTF/FBX import time for animated skeletal meshes.
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#
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# Fix: convert both to HashSet<int>.
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# has() is O(1). keep_bone_rest.push_back() becomes insert().
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# Total cost after: O(T + K). T× speedup for large animation sets.
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#
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# Complexity gate (unit/test-redot-0007-rest-fixer.cpp):
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# T=500 tracks, K=200 bones: time ratio on 5× scale must be <17.5×
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--- a/editor/import/3d/post_import_plugin_skeleton_rest_fixer.cpp
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+++ b/editor/import/3d/post_import_plugin_skeleton_rest_fixer.cpp
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@@ -162,7 +162,8 @@ void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory
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// Fix animation by changing node transform.
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- bones_to_process = src_skeleton->get_parentless_bones();
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+ // FIX redot-0007: convert to HashSet<int> for O(1) .has() — was O(B) Vector scan per track
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+ Vector<int> bones_to_process_vec = src_skeleton->get_parentless_bones();
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+ HashSet<int> bones_to_process(bones_to_process_vec.begin(), bones_to_process_vec.end());
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{
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TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
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while (nodes.size()) {
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@@ -197,7 +197,7 @@ void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory
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int bone_idx = src_skeleton->find_bone(bn);
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int key_len = anim->track_get_key_count(i);
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if (anim->track_get_type(i) == Animation::TYPE_POSITION_3D) {
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- if (bones_to_process.has(bone_idx)) {
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+ if (bones_to_process.has(bone_idx)) { // now O(1) via HashSet
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for (int j = 0; j < key_len; j++) {
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@@ -613,7 +613,8 @@ void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory
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- Vector<int> keep_bone_rest;
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+ // FIX redot-0007: was Vector<int> — .has() O(K) inside O(T) track loop = O(T×K)
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+ HashSet<int> keep_bone_rest;
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if (is_using_modifier || keep_global_rest_leftovers) {
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...
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if (!found_mapped) {
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- keep_bone_rest.push_back(src_idx);
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+ keep_bone_rest.insert(src_idx);
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}
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}
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@@ -678,7 +678,7 @@ void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory
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- } else if (keep_global_rest_leftovers && keep_bone_rest.has(src_idx)) {
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+ } else if (keep_global_rest_leftovers && keep_bone_rest.has(src_idx)) { // O(1)
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@@ -739,7 +739,7 @@ void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory
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- if (keep_bone_rest.has(bone_idx)) {
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+ if (keep_bone_rest.has(bone_idx)); // O(1) via HashSet
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