#ifndef IGL_CREATE_MESH_VBO
#define IGL_CREATE_MESH_VBO
// NOTE: It wouldn't be so hard to template this using Eigen's templates

#include <Eigen/Core>

#if __APPLE__
#  include <OpenGL/gl.h>
#else
#  ifdef _WIN32
#    define NOMINMAX
#    include <Windows.h>
#    undef NOMINMAX
#  endif
#  include <GL/gl.h>
#endif

// Create a VBO (Vertex Buffer Object) for a mesh. Actually two VBOs: one 
// GL_ARRAY_BUFFER for the vertex positions (V) and one
// GL_ELEMENT_ARRAY_BUFFER for the triangle indices (F)
namespace igl
{

  // Inputs:
  //   V  #V by 3 eigen Matrix of mesh vertex 3D positions
  //   F  #F by 3 eigne Matrix of face (triangle) indices
  // Outputs:
  //   V_vbo_id  buffer id for vertex positions
  //   F_vbo_id  buffer id for face indices
  //
  // NOTE: when using glDrawElements VBOs for V and F using MatrixXd and
  // MatrixXi will have types GL_DOUBLE and GL_UNSIGNED_INT respectively
  //
  inline void create_mesh_vbo(
    const Eigen::MatrixXd & V,
    const Eigen::MatrixXi & F,
    GLuint & V_vbo_id,
    GLuint & F_vbo_id);

  // Inputs:
  //   V  #V by 3 eigen Matrix of mesh vertex 3D positions
  //   F  #F by 3 eigne Matrix of face (triangle) indices
  //   N  #V by 3 eigen Matrix of mesh vertex 3D normals
  // Outputs:
  //   V_vbo_id  buffer id for vertex positions
  //   F_vbo_id  buffer id for face indices
  //   N_vbo_id  buffer id for vertex positions
  inline void create_mesh_vbo(
    const Eigen::MatrixXd & V,
    const Eigen::MatrixXi & F,
    const Eigen::MatrixXd & N,
    GLuint & V_vbo_id,
    GLuint & F_vbo_id,
    GLuint & N_vbo_id);

}

// Implementation
#include "create_vector_vbo.h"
#include "create_index_vbo.h"

// http://www.songho.ca/opengl/gl_vbo.html#create
inline void igl::create_mesh_vbo(
  const Eigen::MatrixXd & V,
  const Eigen::MatrixXi & F,
  GLuint & V_vbo_id,
  GLuint & F_vbo_id)
{
  // Create VBO for vertex position vectors
  create_vector_vbo(V,V_vbo_id);
  // Create VBO for face index lists
  create_index_vbo(F,F_vbo_id);
}

// http://www.songho.ca/opengl/gl_vbo.html#create
inline void igl::create_mesh_vbo(
  const Eigen::MatrixXd & V,
  const Eigen::MatrixXi & F,
  const Eigen::MatrixXd & N,
  GLuint & V_vbo_id,
  GLuint & F_vbo_id,
  GLuint & N_vbo_id)
{
  // Create VBOs for faces and vertices
  create_mesh_vbo(V,F,V_vbo_id,F_vbo_id);
  // Create VBO for normal vectors
  create_vector_vbo(N,N_vbo_id);
}

#endif