faster rect command creation

include/pd/lithium/drawlist.hpp

@@ -45,6 +45,8 @@ class PD_API Drawlist {
 
   /** Command Allocation */
   Command& NewCommand();
+  bool HasCommands() { return pCommands.size() > 0; }
+  Command& GetLastCommand() { return pCommands[pCommands.size() - 1]; }
 
   /** Path API */
   void PathAdd(const fvec2& point) { pPath.Push(point); }

include/pd/lithium/vertex.hpp

@@ -9,6 +9,8 @@ class Vertex {
   Vertex() {}
   Vertex(const fvec2& pos, const fvec2& uv, u32 color)
       : pos(pos), uv(uv), color(color) {}
+  Vertex(float x, float y, float u, float v, u32 color)
+      : pos(x, y), uv(u, v), color(color) {}
   ~Vertex() {}
 
   void Reset() {