1 files changed, 48 insertions, 3 deletions
diff --git a/src/engine/RaceManager.cpp b/src/engine/RaceManager.cpp
index ae1ef828f..75b871cde 100644
--- a/src/engine/RaceManager.cpp
+++ b/src/engine/RaceManager.cpp
@@ -13,9 +13,54 @@ extern "C" {
 RaceManager::RaceManager(World& world) : WorldContext(world) {
 }
 
+std::unordered_map<uintptr_t, std::shared_ptr<Vtx>> mirroredVtxCache;
+
+// Populates a collision mesh for mirror mode
+extern "C" void add_triangle_to_collision_mesh(Vtx* vtx1, Vtx* vtx2, Vtx* vtx3, Vtx** outVtx1, Vtx** outVtx2, Vtx** outVtx3) {
+    if (gIsMirrorMode != 0) {
+        auto getOrCreateMirrored = [](Vtx* original) -> Vtx* {
+            uintptr_t key = reinterpret_cast<uintptr_t>(original);
+            
+            auto it = mirroredVtxCache.find(key);
+            if (it != mirroredVtxCache.end()) {
+                return it->second.get();
+            }
+
+            auto newVtx = std::make_shared<Vtx>(*original);
+            newVtx->v.ob[0] = -newVtx->v.ob[0];
+
+            mirroredVtxCache[key] = newVtx;
+
+            return newVtx.get();
+        };
+
+        Vtx* m1 = getOrCreateMirrored(vtx1);
+        Vtx* m2 = getOrCreateMirrored(vtx2);
+        Vtx* m3 = getOrCreateMirrored(vtx3);
+
+        // don't invert winding here, already done in the gfx
+        *outVtx1 = m1;
+        *outVtx2 = m2;
+        *outVtx3 = m3;
+
+    } else {
+        // Pas de miroir, on passe les originaux
+        *outVtx1 = vtx1;
+        *outVtx2 = vtx2;
+        *outVtx3 = vtx3;
+    }
+}
+
 void RaceManager::Load() {
-    if (WorldContext.CurrentCourse) {
-        WorldContext.CurrentCourse->Load();
+    if (WorldContext.GetCurrentCourse()) {
+        mirroredVtxCache.clear();
+        WorldContext.GetCurrentCourse()->Load();
+    }
+}
+
+void RaceManager::UnLoad() {
+    if (WorldContext.GetCurrentCourse()) {
+        WorldContext.GetCurrentCourse()->UnLoad();
     }
 }
 
@@ -29,7 +74,7 @@ void RaceManager::PreInit() {
 }
 
 void RaceManager::BeginPlay() {
-    auto course = WorldContext.CurrentCourse;
+    auto course = WorldContext.GetCurrentCourse();
 
     if (course) {
         // Do not spawn finishline in credits or battle mode. And if bSpawnFinishline.