Add vector types

src/engine.c

@@ -21,6 +21,11 @@ struct ENGINE_COLOR { unsigned char r; unsigned char g; unsigned char b; unsigne
 // WINDOWS
 struct ENGINE_WINDOW { struct ENGINE_TEXTURE * texture; struct ENGINE_FRONTEND_WINDOW * fe_window; };
 
+// VECTORS
+struct ENGINE_VECTOR_2D { float x; float y; };
+struct ENGINE_VECTOR_3D { float x; float y; float z; };
+struct ENGINE_VECTOR_TEX { int x; int y; };
+
 // EVENTS
 struct ENGINE_EVENT { char type; void * data; };
 static char ENGINE_EVENT_TYPE_UNKNOWN = 0;