1 files changed, 10 insertions, 4 deletions
diff --git a/src/sandbox.hpp b/src/sandbox.hpp
index bc6f928..03a6a85 100644
--- a/src/sandbox.hpp
+++ b/src/sandbox.hpp
@@ -1,9 +1,9 @@
 #pragma once
 
+#include "common.hpp"
 #include "rand.hpp"
 
 #include <cstdint>
-#include <vector>
 
 const int MBIT_DISPLACABLE = 1;
 
@@ -28,15 +28,21 @@ struct Tile {
 };
 
 struct Sandbox {
-    std::vector<uint32_t> _bitmap;
-    std::vector<Tile> _a;
+    uint32_t* bitmap;
+    Tile* tiles;
+    /// Dirty rects used by the current simulation step. Only used during it.
+    // TODO use multiple dirty rects?
+    Rect dirty_curr;
+    /// Dirty rects to be used, when the next simulation step happens. May write to this during simulation, or outside of simulation.
+    Rect dirty_writeto;
     RandomState _rand;
     Tile _wall_tile;
     int width, height;
     int _x, _y;
     int ncycle = 0;
 
-    Sandbox(int w, int h);
+    Sandbox(int w, int h, RandomState rand = {});
+    ~Sandbox();
 
     void simulate_step();