add wavefront loader

start adding various scenes to test gpu rigid body pipeline
reserve more memory for shapes (concave triangle mesh can be huge) in GLInstancingRenderer
fix a few crashes when 0 objects

demo/ObjLoader/objLoader.h

@@ -0,0 +1,50 @@
+#ifndef OBJ_LOADER_H
+#define OBJ_LOADER_H
+
+#include "obj_parser.h"
+
+class objLoader
+{
+public:
+	objLoader() {}
+	~objLoader()
+	{
+		delete_obj_data(&data);
+	}
+
+	int load(char *filename);
+
+	obj_vector **vertexList;
+	obj_vector **normalList;
+	obj_vector **textureList;
+	
+	obj_face **faceList;
+	obj_sphere **sphereList;
+	obj_plane **planeList;
+	
+	obj_light_point **lightPointList;
+	obj_light_quad **lightQuadList;
+	obj_light_disc **lightDiscList;
+	
+	obj_material **materialList;
+	
+	int vertexCount;
+	int normalCount;
+	int textureCount;
+
+	int faceCount;
+	int sphereCount;
+	int planeCount;
+
+	int lightPointCount;
+	int lightQuadCount;
+	int lightDiscCount;
+
+	int materialCount;
+
+	obj_camera *camera;
+private:
+	obj_scene_data data;
+};
+
+#endif