/*
 *      Gem-graph OpenGL experiments
 *
 *      Desc: OpenGL utils header
 *
 *  Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
 *  Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
 *
 *  This file is part of Gem-graph.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once
#include <unistd.h>
#include <stdbool.h>
#include <GL/glu.h>

/*
 * Structure describing an arrow
 */
typedef struct arrow_t {
    GLuint load;
    GLuint site;
    GLuint x;
    GLuint y;
    GLuint z;
};

/*
 *  Writes basis and tip for all arrows into vertex and color buffers
 *
 *  @param dimensions (x,y,z)
 *
 *  @return void
 */
void arrows_write_terminations (long x, long y, long z);

/*
 *  Writes lines for arrow oriented to the east or west into lines buffer
 *
 *  @param s,
 *         weight,
 *         site
 *
 *  @return void
 */
void write_arrow_lines_east_west (long s, int weight, int site);

/*
 *  Writes lines for arrow oriented to the zenith or nadir into lines buffer
 *
 *  @param s,
 *         weight,
 *         site
 *
 *  @return void
 */
void write_arrow_lines_zenith_nadir (long s, int weight, int site);

/*
 *  Writes lines for arrow oriented to the south or north into lines buffer
 *
 *  @param s,
 *         weight,
 *         site
 *
 *  @return void
 */
void write_arrow_lines_south_north (long s, int weight, int site);

/*
 *  Writes three lines that draw arrow basis (central star) into lines buffer
 *
 *  @param n
 *
 *  @return void
 */
void arrows_write_basis (long n);

void write_one_arrow(int offset_vertex, int offset_colors, int offset_lines,
                     int space_X, int space_Y, int space_Z,
                     int weight, int site, int x, int y, int z);