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/* $Id: nurbscrv.c,v 1.2 2003/08/22 20:11:43 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
* Copyright (C) 1995-2000 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* NURBS implementation written by Bogdan Sikorski (bogdan@cira.it)
* See README2 for more info.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include <math.h>
#include <stdlib.h>
#include "gluP.h"
#include "nurbs.h"
#endif
/* main NURBS curve procedure */
void
do_nurbs_curve(GLUnurbsObj * nobj)
{
GLint geom_order, color_order = 0, normal_order = 0, texture_order = 0;
GLenum geom_type;
GLint n_ctrl;
GLfloat *new_geom_ctrl, *new_color_ctrl, *new_normal_ctrl,
*new_texture_ctrl;
GLfloat *geom_ctrl = 0, *color_ctrl = 0, *normal_ctrl = 0, *texture_ctrl = 0;
GLint *factors;
GLint i, j;
GLint geom_dim, color_dim = 0, normal_dim = 0, texture_dim = 0;
/* test the user supplied data */
if (test_nurbs_curves(nobj) != GLU_NO_ERROR)
return;
if (convert_curves(nobj, &new_geom_ctrl, &n_ctrl, &new_color_ctrl,
&new_normal_ctrl, &new_texture_ctrl) != GLU_NO_ERROR)
return;
geom_order = nobj->curve.geom.order;
geom_type = nobj->curve.geom.type;
geom_dim = nobj->curve.geom.dim;
if (glu_do_sampling_crv(nobj, new_geom_ctrl, n_ctrl, geom_order, geom_dim,
&factors) != GLU_NO_ERROR) {
free(new_geom_ctrl);
if (new_color_ctrl)
free(new_color_ctrl);
if (new_normal_ctrl)
free(new_normal_ctrl);
if (new_texture_ctrl)
free(new_texture_ctrl);
return;
}
glEnable(geom_type);
if (new_color_ctrl) {
glEnable(nobj->curve.color.type);
color_dim = nobj->curve.color.dim;
color_ctrl = new_color_ctrl;
color_order = nobj->curve.color.order;
}
if (new_normal_ctrl) {
glEnable(nobj->curve.normal.type);
normal_dim = nobj->curve.normal.dim;
normal_ctrl = new_normal_ctrl;
normal_order = nobj->curve.normal.order;
}
if (new_texture_ctrl) {
glEnable(nobj->curve.texture.type);
texture_dim = nobj->curve.texture.dim;
texture_ctrl = new_texture_ctrl;
texture_order = nobj->curve.texture.order;
}
for (i = 0, j = 0, geom_ctrl = new_geom_ctrl;
i < n_ctrl; i += geom_order, j++, geom_ctrl += geom_order * geom_dim) {
if (fine_culling_test_2D
(nobj, geom_ctrl, geom_order, geom_dim, geom_dim)) {
color_ctrl += color_order * color_dim;
normal_ctrl += normal_order * normal_dim;
texture_ctrl += texture_order * texture_dim;
continue;
}
glMap1f(geom_type, 0.0, 1.0, geom_dim, geom_order, geom_ctrl);
if (new_color_ctrl) {
glMap1f(nobj->curve.color.type, 0.0, 1.0, color_dim,
color_order, color_ctrl);
color_ctrl += color_order * color_dim;
}
if (new_normal_ctrl) {
glMap1f(nobj->curve.normal.type, 0.0, 1.0, normal_dim,
normal_order, normal_ctrl);
normal_ctrl += normal_order * normal_dim;
}
if (new_texture_ctrl) {
glMap1f(nobj->curve.texture.type, 0.0, 1.0, texture_dim,
texture_order, texture_ctrl);
texture_ctrl += texture_order * texture_dim;
}
glMapGrid1f(factors[j], 0.0, 1.0);
glEvalMesh1(GL_LINE, 0, factors[j]);
}
free(new_geom_ctrl);
free(factors);
if (new_color_ctrl)
free(new_color_ctrl);
if (new_normal_ctrl)
free(new_normal_ctrl);
if (new_texture_ctrl)
free(new_texture_ctrl);
}
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