wip: wait until data is ready and has been consumed (couples physics and rendering thread again)

include/renderer.hpp

@@ -61,10 +61,9 @@ public:
   }
 
 private:
-  auto AllocateGraphInstancing(const std::vector<Mass> &masses) -> void;
+  auto AllocateGraphInstancing(std::size_t size) -> void;
 
-  auto ReallocateGraphInstancingIfNecessary(const std::vector<Mass> &masses)
-      -> void;
+  auto ReallocateGraphInstancingIfNecessary(std::size_t size) -> void;
 
 public:
   auto UpdateTextureSizes() -> void;