cube-game-plus-plus/engine/Mesh.h

#ifndef MESH_H
#define MESH_H

#include <GL/glew.h>
#include <GLFW/glfw3.h>

class Mesh
{
public:
    Mesh(int mode);
    virtual ~Mesh();
    
    void addPosition(float x, float y, float z);
    void addColor(float r, float g, float b, float a);
    void addTexture(float tx, float ty);
    void addNormal(float nx, float ny, float nz);
    
    void build(bool print = false);
    void draw();
    void draw(int start, int count);
    
    static const int COLOR = 1;
    static const int TEXTURE = 2;
    static const int NORMAL = 4;
private:
    void ensureCapacity(unsigned int index);
    
    GLuint vba = 0;
    GLuint vbo = 0;
    
    unsigned int positionStartIndex = 0;
    unsigned int colorStartIndex = 0;
    unsigned int textureStartIndex = 0;
    unsigned int normalStartIndex = 0;
    
    unsigned int positionIndex = 0;
    unsigned int colorIndex = 0;
    unsigned int textureIndex = 0;
    unsigned int normalIndex = 0;
    
    unsigned int vertexSize = 0;
    unsigned int vertices = 0;
    unsigned int dataSize = 3;
    
    float* data = nullptr;
};

class NormalTextureMesh : public Mesh
{
public:
    NormalTextureMesh() : Mesh(Mesh::TEXTURE | Mesh::NORMAL) {};
};

#endif