#ifndef IGL_CREATE_MESH_VBO_H
#define IGL_CREATE_MESH_VBO_H
#include "igl_inline.h"
// NOTE: It wouldn't be so hard to template this using Eigen's templates

#include <Eigen/Core>

#ifdef __APPLE__
#  include <OpenGL/gl.h>
#elif defined(_WIN32)
#  define NOMINMAX
#  include <Windows.h>
#  undef NOMINMAX
#  include <GL/glew.h>
#  include <GL/gl.h>
#else
#  define GL_GLEXT_PROTOTYPES
#  include <GL/gl.h>
#  include <GL/glext.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
  //
  IGL_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
  IGL_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);

}

#ifdef IGL_HEADER_ONLY
#  include "create_mesh_vbo.cpp"
#endif

#endif