//! Billboard object class
/*!
 * Quick and easy class for displaying billboards
 */
/* Copyright (C) 2010  Alejandro Valenzuela Roca, <lanjoe9 at mexinetica NOSPAMPLEASE dot com>
 *
 * This file is part of MotorJ, a free framework for videogame creation.
 * <http://wiki.lidsol.net/wiki/index.php?title=MotorJ >
 * <http://motorj.mexinetica.com/ >
 *
 * MotorJ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MotorJ 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with MotorJ.  If not, see <http://www.gnu.org/licenses/>.
 */



#include "billboard-class.h"

mjBillboard::mjBillboard(vector3 * cameraPos)
{
    cPos = cameraPos;
    v3_i(&drawUp);
    v3_1(&scale);
    r.u = 1;
    r.v = 1;
    bList = glGenLists(1);
    glNewList(bList, GL_COMPILE);


    glBegin(GL_QUADS);
    glTexCoord2f(1,1);
    glVertex2f(0.5, 0.5);
    glTexCoord2f(1,0);
    glVertex2f(-0.5, 0.5);
    glTexCoord2f(0,0);
    glVertex2f(-0.5, -0.5);
    glTexCoord2f(0,1);
    glVertex2f(0.5, -0.5);
    glEnd();
    //mjPlane(r.u, r.v);

    glEndList();

}

mjBillboard::~mjBillboard()
{
    glDeleteLists(bList, 1);
}

void mjBillboard::Draw()
{
    // drawUpdate dir to camera
    vec_copy(*cPos,&drawDir);
    vec_sum(-1, p, &drawDir);
    //drawDir.y = 0;
    normalize(&drawDir);
    drawUp.x = -0.5*drawDir.y*drawDir.z;
    drawUp.y = drawDir.x*drawDir.z;
    drawUp.z = -0.5*drawDir.y*drawDir.x;
    normalize(&drawUp);

    push();
    obj_pos_rot(p, drawDir, drawUp);
    glBindTexture(GL_TEXTURE_2D, tex);
    glScalef(scale.x, scale.y, scale.z);
    glCallList(bList);
    glBindTexture(NULL, tex);
    pop();

}