#ifndef CYLINDER_HPP
#define CYLINDER_HPP

#include <GL/glu.h>
#include <math.h>
#include <array>
#include <QOpenGLFunctions>


struct Color
{
	float r;
	float g;
	float b;

	Color(float r, float g, float b) :r(r), g(g), b(b) {};
};


struct VertexBuf
{
	size_t i = 0;
	size_t size;
	GLfloat *vertices;
	GLfloat *colors;

	VertexBuf(size_t i)
		:size(i*3),
		 vertices(new GLfloat[size]),
		 colors(new GLfloat[size]) {}

	void push(GLfloat x, GLfloat y, GLfloat z, Color &c);
};


struct Cylinder
{
	float ep;
	float r;
	unsigned nb_fac;
	Color c;
	float angle;

	size_t face_size;
	size_t side_size;

	VertexBuf vb;

	Cylinder(float ep, float r, unsigned nb_fac, Color c)
		:ep(ep),
		r(r),
		nb_fac(nb_fac),
		c(c),
		angle(2*M_PI/nb_fac),
		face_size(nb_fac*3),
		side_size((nb_fac+1) * 2),
		vb(2 * face_size + side_size)
		{
			build_faces();
			build_side();
		}

	void build_face(float z);
	void build_faces();
	void build_side();
	void draw(QOpenGLFunctions &f, int pos, int col);
};

#endif