persist module render commands

include/utils/Renderer/Renderer.h

@@ -17,7 +17,16 @@ namespace Archimedes {
 
             void render();
 
-            void addRenderCmd(renderCmd* cmd) { rc.push_back(cmd); }
+            std::list<renderCmd*>::iterator addRenderCmd(renderCmd* cmd) {
+                
+                auto it = rc.end();
+                rc.push_back(cmd);
+                return it;
+            }
+
+            void removeRenderCmd(std::list<renderCmd*>::iterator cmd) {
+                rc.erase(cmd);
+            }
 
         private:
             std::list<renderCmd*> rc;

include/utils/Renderer/RendererOpenGL/RendererOpenGL.h

@@ -27,7 +27,6 @@ namespace Archimedes {
 
                 for(auto* f : cmdList)
                     f();
-                cmdList.clear();
             }
     };