#ifndef MESH_H
#define MESH_H

#include <glew/glew.h>
#include <vector>
#include <glm/vec3.hpp>
#include <glm/vec2.hpp>

class Mesh
{
protected:
	enum {
		// required buffers
		INDICES_BUFFER, POSITION_BUFFER,
		// optionnal buffers :
		NORMAL_BUFFER, TEXCOORD_BUFFER, TANGENT_BUFFER,

		NB_BUFFERS
	};

    typedef struct
    {
        glm::vec3 tangent;
		glm::vec3 binormal;
    } Tangents;

    std::vector<glm::vec3> positions;
    std::vector<glm::vec3> normals;
    std::vector<glm::vec2> texCoords;
    std::vector<Tangents> tangents;
    std::vector<unsigned int> indices;

    GLuint vao;
    GLuint vbo[NB_BUFFERS];
    bool locked;

public:
    ~Mesh();

	bool hasNormals();
	bool hasTexCoords();
	bool hasTangents();

    /*
     * When the mesh is locked, addFace and addVertex do nothing, but the mesh can be drawn
     * initGL locks the mesh
     * destroyGL unlocks the mesh
     */
    void initGL(bool isDynamic = false);
    void destroyGL();
    void draw();
    bool isLocked(){return locked;}
};

#endif // MESH_H