From 52d1a04b30b5ce8da9b9dcce02e829a35f664dcb Mon Sep 17 00:00:00 2001
From: nathan <nathansmith@disroot.org>
Date: Tue, 11 Nov 2025 02:38:51 -0700
Subject: Render distance thingy

---
 src/world.c | 50 +++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 45 insertions(+), 5 deletions(-)

(limited to 'src/world.c')

diff --git a/src/world.c b/src/world.c
index 5ffec66..6f2e093 100644
--- a/src/world.c
+++ b/src/world.c
@@ -509,13 +509,13 @@ void generateWorldSamanthasPlace(World* world, const Assets* assets,
   Vector3 center = Vector3Scale(world->size, 0.5);
   Entity spot = createEntity(SAMANTHAS_SPOT, center);
   world->entities[*placeId] = spot;
+  world->places[*placeId] = *placeId;
   *placeId = *placeId + 1;
 
   // Samantha.
   Entity samantha = createEntity(SAMANTHA, Vector3Add(center,
                                                       SAMANTHA_OFFSET));
   world->entities[*placeId] = samantha;
-  *placeId = *placeId + 1;
 
   // Trashcans yippee!
   Vector3 trashPosition = (Vector3){-SAMANTHAS_SPOT,
@@ -824,15 +824,57 @@ void drawBVHDebug(BVHNode bvh, int level, int selected)
   }
 }
 
+float getBVHNodeDistance(BVHNode node, Vector3 position)
+{
+  return Vector3Distance(node.position, position)
+    - (Vector3Distance(node.box.min, node.box.max) / 2.0);
+}
+
+void updateNearByEntites(World* world, BVHNode node, Game* game)
+{
+  if (getBVHNodeDistance(node, game->player.position)
+      > game->settings.maxUpdateDistance)
+  {
+    return;
+  }
+
+  // Leaf node.
+  if (node.branchCount == 0)
+  {
+    for (int index = 0; index < BVH_MAX; ++index)
+    {
+      if (node.entities[index] != -1)
+      {
+        Entity* entity = &world->entities[node.entities[index]];
+        
+        if (!entityIsPlace(entity->id))
+        {
+          updateEntity(entity, game);
+        }
+      }
+    }
+  }
+  else // Subtree.
+  {
+    for (int index = 0; index < node.branchCount; ++index)
+    {
+      updateNearByEntites(world, *node.branches[index], game);
+    }
+  }
+}
+
 void updateWorld(World* world, Game* game)
 {
   DrawModel(world->heightmap, Vector3Zero(), 1.0, WHITE);
 
-  for (int index = 0; index < WORLD_ENTITY_MAX; ++index)
+  // Update places.
+  for (int index = 0; index < WORLD_PLACE_COUNT; ++index)
   {
-    updateEntity(&world->entities[index], game);
+    updateEntity(&world->entities[world->places[index]], game);
   }
 
+  updateNearByEntites(world, world->bvh, game);
+
   DrawMeshInstanced(game->assets.models[UTILITY_POLE_MODEL].meshes[0],
                     game->assets.models[UTILITY_POLE_MODEL].materials[0],
                     world->utilityPoleTransforms,
@@ -993,8 +1035,6 @@ void castRayBVH(const World* world, BVHNode node, Ray ray, bool allowAll,
                  closest, closestDistance);
     }
   }
-
-  return;
 }
 
 WorldUID castRayAtWorld(const World* world, Ray ray, bool allowAll,
-- 
cgit v1.2.3