adds naive update for light and volumes

src/scene/empty_volume.rs

@@ -17,6 +17,7 @@ use super::AppData;
 use super::LightsIter;
 use super::Scene;
 
+#[derive(Clone, Debug)]
 pub struct EmptyVolume {
     pub memory_start: usize,
 
@@ -49,6 +50,9 @@ pub struct EmptyVolume {
     pub neighbor_front: Vec<Option<Rc<RefCell<Self>>>>,
 
     pub scale: f32,
+
+    old_memory_size: u32,
+    dirty: bool,
 }
 
 impl EmptyVolume {
@@ -304,6 +308,8 @@ impl EmptyVolume {
                             neighbor_back: vec![],
                             neighbor_front: vec![],
                             scale: tree.borrow().scale,
+                            old_memory_size: 0,
+                            dirty: true,
                         };
                         println!("adding neighbor references");
                         // MARK: fill in info in the neighbor octtree
@@ -1274,7 +1280,7 @@ impl Memorizable for EmptyVolume {
         mem_size
     }
     // MARK: insert into Memory
-    fn insert_into_memory(&self, mut v: Vec<u32>, data: &AppData, scene: &Scene) -> Vec<u32> {
+    fn insert_into_memory(&mut self, mut v: Vec<u32>, data: &AppData, scene: &Scene) -> Vec<u32> {
         let mut mem_index = self.memory_start;
         //pos
         v[mem_index] = u32::from_ne_bytes(self.real_position.x.to_ne_bytes());
@@ -1591,6 +1597,9 @@ impl Memorizable for EmptyVolume {
             v[mem_index] = 0;
             mem_index += 1;
         }
+
+        self.dirty = false;
+        self.old_memory_size = self.get_buffer_mem_size(data);
         //println!("last memory index of volume was {}, equivalent to {}kB", mem_index, mem_index * 32 / 8 / 1024);
         v
     }
@@ -1602,6 +1611,13 @@ impl Memorizable for EmptyVolume {
     fn set_memory_start(&mut self, memory_start: usize) {
         self.memory_start = memory_start;
     }
+
+    fn get_prev_buffer_mem_size(&self) -> u32 {
+        self.old_memory_size
+    }
+    fn is_dirty(&self) -> bool {
+        self.dirty
+    }
 }
 
 impl PartialEq for EmptyVolume {