WebSVN - shark - Rev 55 - /shark/trunk/ports/mesa/src-glu/nurbssrf.c

/* $Id: nurbssrf.c,v 1.1 2003-02-28 11:42:07 pj 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 <string.h>
#include "gluP.h"
#include "nurbs.h"
#endif

static int
get_surface_dim(GLenum type)
{
switch (type) {
case GL_MAP2_VERTEX_3:
return 3;
case GL_MAP2_VERTEX_4:
return 4;
case GL_MAP2_INDEX:
return 1;
case GL_MAP2_COLOR_4:
return 4;
case GL_MAP2_NORMAL:
return 3;
case GL_MAP2_TEXTURE_COORD_1:
return 1;
case GL_MAP2_TEXTURE_COORD_2:
return 2;
case GL_MAP2_TEXTURE_COORD_3:
return 3;
case GL_MAP2_TEXTURE_COORD_4:
return 4;
default:
abort(); /* TODO: is this OK? */
}
return 0; /*never get here */
}

static GLenum
test_nurbs_surface(GLUnurbsObj * nobj, surface_attribs * attrib)
{
GLenum err;
GLint tmp_int;

if (attrib->sorder < 0 || attrib->torder < 0) {
call_user_error(nobj, GLU_INVALID_VALUE);
return GLU_ERROR;
}
glGetIntegerv(GL_MAX_EVAL_ORDER, &tmp_int);
if (attrib->sorder > tmp_int || attrib->sorder < 2) {
call_user_error(nobj, GLU_NURBS_ERROR1);
return GLU_ERROR;
}
if (attrib->torder > tmp_int || attrib->torder < 2) {
call_user_error(nobj, GLU_NURBS_ERROR1);
return GLU_ERROR;
}
if (attrib->sknot_count < attrib->sorder + 2) {
call_user_error(nobj, GLU_NURBS_ERROR2);
return GLU_ERROR;
}
if (attrib->tknot_count < attrib->torder + 2) {
call_user_error(nobj, GLU_NURBS_ERROR2);
return GLU_ERROR;
}
if (attrib->s_stride < 0 || attrib->t_stride < 0) {
call_user_error(nobj, GLU_NURBS_ERROR34);
return GLU_ERROR;
}
if (attrib->sknot == NULL || attrib->tknot == NULL
|| attrib->ctrlarray == NULL) {
call_user_error(nobj, GLU_NURBS_ERROR36);
return GLU_ERROR;
}
if ((err = test_knot(attrib->tknot_count, attrib->tknot, attrib->torder))
!= GLU_NO_ERROR) {
call_user_error(nobj, err);
return GLU_ERROR;
}
if ((err = test_knot(attrib->sknot_count, attrib->sknot, attrib->sorder))
!= GLU_NO_ERROR) {
call_user_error(nobj, err);
return GLU_ERROR;
}
return GLU_NO_ERROR;
}

static GLenum
test_nurbs_surfaces(GLUnurbsObj * nobj)
{
/* test the geometric data */
if (test_nurbs_surface(nobj, &(nobj->surface.geom)) != GLU_NO_ERROR)
return GLU_ERROR;
/* now test the attributive data */
/* color */
if (nobj->surface.color.type != GLU_INVALID_ENUM)
if (test_nurbs_surface(nobj, &(nobj->surface.color)) != GLU_NO_ERROR)
return GLU_ERROR;
/* normal */
if (nobj->surface.normal.type != GLU_INVALID_ENUM)
if (test_nurbs_surface(nobj, &(nobj->surface.normal)) != GLU_NO_ERROR)
return GLU_ERROR;
/* texture */
if (nobj->surface.texture.type != GLU_INVALID_ENUM)
if (test_nurbs_surface(nobj, &(nobj->surface.texture)) != GLU_NO_ERROR)
return GLU_ERROR;
return GLU_NO_ERROR;
}

static GLenum
convert_surf(knot_str_type * s_knot, knot_str_type * t_knot,
surface_attribs * attrib, GLfloat ** new_ctrl,
GLint * s_n_ctrl, GLint * t_n_ctrl)
{
GLfloat **tmp_ctrl;
GLfloat *ctrl_offset;
GLint tmp_n_control;
GLint i, j, t_cnt, s_cnt;
GLint tmp_stride;
GLint dim;
GLenum err;

/* valid range is empty? */
if ((s_knot->unified_knot != NULL && s_knot->unified_nknots == 0) ||
(t_knot->unified_knot != NULL && t_knot->unified_nknots == 0)) {
if (s_knot->unified_knot) {
free(s_knot->unified_knot);
s_knot->unified_knot = NULL;
}
if (t_knot->unified_knot) {
free(t_knot->unified_knot);
t_knot->unified_knot = NULL;
}
*s_n_ctrl = 0;
*t_n_ctrl = 0;
return GLU_NO_ERROR;
}
t_cnt = attrib->tknot_count - attrib->torder;
s_cnt = attrib->sknot_count - attrib->sorder;
if ((tmp_ctrl = (GLfloat **) malloc(sizeof(GLfloat *) * t_cnt)) == NULL)
return GLU_OUT_OF_MEMORY;
if ((err = explode_knot(s_knot)) != GLU_NO_ERROR) {
free(tmp_ctrl);
if (s_knot->unified_knot) {
free(s_knot->unified_knot);
s_knot->unified_knot = NULL;
}
return err;
}
if (s_knot->unified_knot) {
free(s_knot->unified_knot);
s_knot->unified_knot = NULL;
}
if ((err = calc_alphas(s_knot)) != GLU_NO_ERROR) {
free(tmp_ctrl);
free(s_knot->new_knot);
return err;
}
free(s_knot->new_knot);
ctrl_offset = attrib->ctrlarray;
dim = attrib->dim;
for (i = 0; i < t_cnt; i++) {
if ((err = calc_new_ctrl_pts(ctrl_offset, attrib->s_stride, s_knot,
dim, &(tmp_ctrl[i]),
&tmp_n_control)) != GLU_NO_ERROR) {
for (--i; i <= 0; i--)
free(tmp_ctrl[i]);
free(tmp_ctrl);
free(s_knot->alpha);
return err;
}
ctrl_offset += attrib->t_stride;
}
free(s_knot->alpha);
tmp_stride = dim * tmp_n_control;
if ((*new_ctrl = (GLfloat *) malloc(sizeof(GLfloat) * tmp_stride * t_cnt))
== NULL) {
for (i = 0; i < t_cnt; i++)
free(tmp_ctrl[i]);
free(tmp_ctrl);
return GLU_OUT_OF_MEMORY;
}
for (i = 0; i < tmp_n_control; i++)
for (j = 0; j < t_cnt; j++)
MEMCPY(*new_ctrl + j * dim + i * dim * t_cnt, tmp_ctrl[j] + dim * i,
sizeof(GLfloat) * dim);
for (i = 0; i < t_cnt; i++)
free(tmp_ctrl[i]);
free(tmp_ctrl);
*s_n_ctrl = tmp_n_control;

if ((tmp_ctrl = (GLfloat **) malloc(sizeof(GLfloat *) * (*s_n_ctrl))) ==
NULL) {
return GLU_OUT_OF_MEMORY;
}
if ((err = explode_knot(t_knot)) != GLU_NO_ERROR) {
free(tmp_ctrl);
if (t_knot->unified_knot) {
free(t_knot->unified_knot);
t_knot->unified_knot = NULL;
}
return err;
}
if (t_knot->unified_knot) {
free(t_knot->unified_knot);
t_knot->unified_knot = NULL;
}
if ((err = calc_alphas(t_knot)) != GLU_NO_ERROR) {
free(tmp_ctrl);
free(t_knot->new_knot);
return err;
}
free(t_knot->new_knot);
ctrl_offset = *new_ctrl;
for (i = 0; i < (*s_n_ctrl); i++) {
if ((err = calc_new_ctrl_pts(ctrl_offset, dim, t_knot,
dim, &(tmp_ctrl[i]),
&tmp_n_control)) != GLU_NO_ERROR) {
for (--i; i <= 0; i--)
free(tmp_ctrl[i]);
free(tmp_ctrl);
free(t_knot->alpha);
return err;
}
ctrl_offset += dim * t_cnt;
}
free(t_knot->alpha);
free(*new_ctrl);
tmp_stride = dim * tmp_n_control;
if (
(*new_ctrl =
(GLfloat *) malloc(sizeof(GLfloat) * tmp_stride * (*s_n_ctrl))) ==
NULL) {
for (i = 0; i < (*s_n_ctrl); i++)
free(tmp_ctrl[i]);
free(tmp_ctrl);
return GLU_OUT_OF_MEMORY;
}
for (i = 0; i < (*s_n_ctrl); i++) {
MEMCPY(*new_ctrl + i * tmp_stride, tmp_ctrl[i],
sizeof(GLfloat) * tmp_stride);
free(tmp_ctrl[i]);
}
free(tmp_ctrl);
*t_n_ctrl = tmp_n_control;
return GLU_NO_ERROR;
}

/* prepare the knot information structures */
static GLenum
fill_knot_structures(GLUnurbsObj * nobj,
knot_str_type * geom_s_knot, knot_str_type * geom_t_knot,
knot_str_type * color_s_knot,
knot_str_type * color_t_knot,
knot_str_type * normal_s_knot,
knot_str_type * normal_t_knot,
knot_str_type * texture_s_knot,
knot_str_type * texture_t_knot)
{
GLint order;
GLfloat *knot;
GLint nknots;
GLint t_min, t_max;

geom_s_knot->unified_knot = NULL;
knot = geom_s_knot->knot = nobj->surface.geom.sknot;
nknots = geom_s_knot->nknots = nobj->surface.geom.sknot_count;
order = geom_s_knot->order = nobj->surface.geom.sorder;
geom_s_knot->delta_nknots = 0;
t_min = geom_s_knot->t_min = order - 1;
t_max = geom_s_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
geom_s_knot->open_at_begin = GL_TRUE;
}
else
geom_s_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
geom_s_knot->open_at_end = GL_TRUE;
}
else
geom_s_knot->open_at_end = GL_FALSE;
geom_t_knot->unified_knot = NULL;
knot = geom_t_knot->knot = nobj->surface.geom.tknot;
nknots = geom_t_knot->nknots = nobj->surface.geom.tknot_count;
order = geom_t_knot->order = nobj->surface.geom.torder;
geom_t_knot->delta_nknots = 0;
t_min = geom_t_knot->t_min = order - 1;
t_max = geom_t_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
geom_t_knot->open_at_begin = GL_TRUE;
}
else
geom_t_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
geom_t_knot->open_at_end = GL_TRUE;
}
else
geom_t_knot->open_at_end = GL_FALSE;

if (nobj->surface.color.type != GLU_INVALID_ENUM) {
color_s_knot->unified_knot = (GLfloat *) 1;
knot = color_s_knot->knot = nobj->surface.color.sknot;
nknots = color_s_knot->nknots = nobj->surface.color.sknot_count;
order = color_s_knot->order = nobj->surface.color.sorder;
color_s_knot->delta_nknots = 0;
t_min = color_s_knot->t_min = order - 1;
t_max = color_s_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
color_s_knot->open_at_begin = GL_TRUE;
}
else
color_s_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
color_s_knot->open_at_end = GL_TRUE;
}
else
color_s_knot->open_at_end = GL_FALSE;
color_t_knot->unified_knot = (GLfloat *) 1;
knot = color_t_knot->knot = nobj->surface.color.tknot;
nknots = color_t_knot->nknots = nobj->surface.color.tknot_count;
order = color_t_knot->order = nobj->surface.color.torder;
color_t_knot->delta_nknots = 0;
t_min = color_t_knot->t_min = order - 1;
t_max = color_t_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
color_t_knot->open_at_begin = GL_TRUE;
}
else
color_t_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
color_t_knot->open_at_end = GL_TRUE;
}
else
color_t_knot->open_at_end = GL_FALSE;
}
else {
color_s_knot->unified_knot = NULL;
color_t_knot->unified_knot = NULL;
}

if (nobj->surface.normal.type != GLU_INVALID_ENUM) {
normal_s_knot->unified_knot = (GLfloat *) 1;
knot = normal_s_knot->knot = nobj->surface.normal.sknot;
nknots = normal_s_knot->nknots = nobj->surface.normal.sknot_count;
order = normal_s_knot->order = nobj->surface.normal.sorder;
normal_s_knot->delta_nknots = 0;
t_min = normal_s_knot->t_min = order - 1;
t_max = normal_s_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
normal_s_knot->open_at_begin = GL_TRUE;
}
else
normal_s_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
normal_s_knot->open_at_end = GL_TRUE;
}
else
normal_s_knot->open_at_end = GL_FALSE;
normal_t_knot->unified_knot = (GLfloat *) 1;
knot = normal_t_knot->knot = nobj->surface.normal.tknot;
nknots = normal_t_knot->nknots = nobj->surface.normal.tknot_count;
order = normal_t_knot->order = nobj->surface.normal.torder;
normal_t_knot->delta_nknots = 0;
t_min = normal_t_knot->t_min = order - 1;
t_max = normal_t_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
normal_t_knot->open_at_begin = GL_TRUE;
}
else
normal_t_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
normal_t_knot->open_at_end = GL_TRUE;
}
else
normal_t_knot->open_at_end = GL_FALSE;
}
else {
normal_s_knot->unified_knot = NULL;
normal_t_knot->unified_knot = NULL;
}

if (nobj->surface.texture.type != GLU_INVALID_ENUM) {
texture_s_knot->unified_knot = (GLfloat *) 1;
knot = texture_s_knot->knot = nobj->surface.texture.sknot;
nknots = texture_s_knot->nknots = nobj->surface.texture.sknot_count;
order = texture_s_knot->order = nobj->surface.texture.sorder;
texture_s_knot->delta_nknots = 0;
t_min = texture_s_knot->t_min = order - 1;
t_max = texture_s_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
texture_s_knot->open_at_begin = GL_TRUE;
}
else
texture_s_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
texture_s_knot->open_at_end = GL_TRUE;
}
else
texture_s_knot->open_at_end = GL_FALSE;
texture_t_knot->unified_knot = (GLfloat *) 1;
knot = texture_t_knot->knot = nobj->surface.texture.tknot;
nknots = texture_t_knot->nknots = nobj->surface.texture.tknot_count;
order = texture_t_knot->order = nobj->surface.texture.torder;
texture_t_knot->delta_nknots = 0;
t_min = texture_t_knot->t_min = order - 1;
t_max = texture_t_knot->t_max = nknots - order;
if (fabs(knot[t_min] - knot[t_max]) < EPSILON) {
call_user_error(nobj, GLU_NURBS_ERROR3);
return GLU_ERROR;
}
if (fabs(knot[0] - knot[t_min]) < EPSILON) {
/* knot open at beggining */
texture_t_knot->open_at_begin = GL_TRUE;
}
else
texture_t_knot->open_at_begin = GL_FALSE;
if (fabs(knot[t_max] - knot[nknots - 1]) < EPSILON) {
/* knot open at end */
texture_t_knot->open_at_end = GL_TRUE;
}
else
texture_t_knot->open_at_end = GL_FALSE;
}
else {
texture_s_knot->unified_knot = NULL;
texture_t_knot->unified_knot = NULL;
}
return GLU_NO_ERROR;
}

static void
free_new_ctrl(new_ctrl_type * p)
{
if (p->geom_ctrl)
free(p->geom_ctrl);
if (p->geom_offsets)
free(p->geom_offsets);
if (p->color_ctrl) {
free(p->color_ctrl);
if (p->color_offsets)
free(p->color_offsets);
}
if (p->normal_ctrl) {
free(p->normal_ctrl);
if (p->normal_offsets)
free(p->normal_offsets);
}
if (p->texture_ctrl) {
free(p->texture_ctrl);
if (p->texture_offsets)
free(p->texture_offsets);
}
}

/* convert surfaces - geometry and possible attribute ones into equivalent */
/* sequence of adjacent Bezier patches */
static GLenum
convert_surfs(GLUnurbsObj * nobj, new_ctrl_type * new_ctrl)
{
knot_str_type geom_s_knot, color_s_knot, normal_s_knot, texture_s_knot;
knot_str_type geom_t_knot, color_t_knot, normal_t_knot, texture_t_knot;
GLenum err;

if ((err = fill_knot_structures(nobj, &geom_s_knot, &geom_t_knot,
&color_s_knot, &color_t_knot,
&normal_s_knot, &normal_t_knot,
&texture_s_knot,
&texture_t_knot)) != GLU_NO_ERROR) {
return err;
}
/* unify knots - all knots should have the same working range */
if ((err = select_knot_working_range(nobj, &geom_s_knot, &color_s_knot,
&normal_s_knot,
&texture_s_knot)) != GLU_NO_ERROR) {
call_user_error(nobj, err);
return err;
}
if ((err = select_knot_working_range(nobj, &geom_t_knot, &color_t_knot,
&normal_t_knot,
&texture_t_knot)) != GLU_NO_ERROR) {
free_unified_knots(&geom_s_knot, &color_s_knot, &normal_s_knot,
&texture_s_knot);
call_user_error(nobj, err);
return err;
}

/* convert the geometry surface */
nobj->surface.geom.dim = get_surface_dim(nobj->surface.geom.type);
if ((err = convert_surf(&geom_s_knot, &geom_t_knot, &(nobj->surface.geom),
&(new_ctrl->geom_ctrl), &(new_ctrl->geom_s_pt_cnt),
&(new_ctrl->geom_t_pt_cnt))) != GLU_NO_ERROR) {
free_unified_knots(&geom_s_knot, &color_s_knot, &normal_s_knot,
&texture_s_knot);
free_unified_knots(&geom_t_knot, &color_t_knot, &normal_t_knot,
&texture_t_knot);
call_user_error(nobj, err);
return err;
}
/* if additional attributive surfaces are given convert them as well */
if (color_s_knot.unified_knot) {
nobj->surface.color.dim = get_surface_dim(nobj->surface.color.type);
if (
(err =
convert_surf(&color_s_knot, &color_t_knot, &(nobj->surface.color),
&(new_ctrl->color_ctrl), &(new_ctrl->color_s_pt_cnt),
&(new_ctrl->color_t_pt_cnt))) != GLU_NO_ERROR) {
free_unified_knots(&color_s_knot, &color_s_knot, &normal_s_knot,
&texture_s_knot);
free_unified_knots(&color_t_knot, &color_t_knot, &normal_t_knot,
&texture_t_knot);
free_new_ctrl(new_ctrl);
call_user_error(nobj, err);
return err;
}
}
if (normal_s_knot.unified_knot) {
nobj->surface.normal.dim = get_surface_dim(nobj->surface.normal.type);
if ((err = convert_surf(&normal_s_knot, &normal_t_knot,
&(nobj->surface.normal),
&(new_ctrl->normal_ctrl),
&(new_ctrl->normal_s_pt_cnt),
&(new_ctrl->normal_t_pt_cnt))) !=
GLU_NO_ERROR) {
free_unified_knots(&normal_s_knot, &normal_s_knot, &normal_s_knot,
&texture_s_knot);
free_unified_knots(&normal_t_knot, &normal_t_knot, &normal_t_knot,
&texture_t_knot);
free_new_ctrl(new_ctrl);
call_user_error(nobj, err);
return err;
}
}
if (texture_s_knot.unified_knot) {
nobj->surface.texture.dim = get_surface_dim(nobj->surface.texture.type);
if ((err = convert_surf(&texture_s_knot, &texture_t_knot,
&(nobj->surface.texture),
&(new_ctrl->texture_ctrl),
&(new_ctrl->texture_s_pt_cnt),
&(new_ctrl->texture_t_pt_cnt))) !=
GLU_NO_ERROR) {
free_unified_knots(&texture_s_knot, &texture_s_knot, &texture_s_knot,
&texture_s_knot);
free_unified_knots(&texture_t_knot, &texture_t_knot, &texture_t_knot,
&texture_t_knot);
free_new_ctrl(new_ctrl);
call_user_error(nobj, err);
return err;
}
}
return GLU_NO_ERROR;
}

/* tesselate the "boundary" Bezier edge strips */
static void
tesselate_strip_t_line(GLint top_start, GLint top_end, GLint top_z,
GLint bottom_start, GLint bottom_end, GLint bottom_z,
GLint bottom_domain)
{
GLint top_cnt, bottom_cnt, tri_cnt, k;
GLint direction;

top_cnt = top_end - top_start;
direction = (top_cnt >= 0 ? 1 : -1);
bottom_cnt = bottom_end - bottom_start;
glBegin(GL_LINES);
while (top_cnt) {
if (bottom_cnt)
tri_cnt = top_cnt / bottom_cnt;
else
tri_cnt = abs(top_cnt);
for (k = 0; k <= tri_cnt; k++, top_start += direction) {
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
glEvalPoint2(top_z, top_start);
}
if (bottom_cnt) {
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
bottom_start += direction;
top_start -= direction;
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
glEvalPoint2(top_z, top_start);
}
top_cnt -= direction * tri_cnt;
bottom_cnt -= direction;
}
glEnd();
}

static void
tesselate_strip_t_fill(GLint top_start, GLint top_end, GLint top_z,
GLint bottom_start, GLint bottom_end, GLint bottom_z,
GLint bottom_domain)
{
GLint top_cnt, bottom_cnt, tri_cnt, k;
GLint direction;

top_cnt = top_end - top_start;
direction = (top_cnt >= 0 ? 1 : -1);
bottom_cnt = bottom_end - bottom_start;
while (top_cnt) {
if (bottom_cnt)
tri_cnt = top_cnt / bottom_cnt;
else
tri_cnt = abs(top_cnt);
glBegin(GL_TRIANGLE_FAN);
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
for (k = 0; k <= tri_cnt; k++, top_start += direction)
glEvalPoint2(top_z, top_start);
if (bottom_cnt) {
bottom_start += direction;
top_start -= direction;
glEvalCoord2f((GLfloat) bottom_z / bottom_domain,
(GLfloat) bottom_start / bottom_domain);
}
glEnd();
top_cnt -= direction * tri_cnt;
bottom_cnt -= direction;
}
}

static void
tesselate_strip_t(GLenum display_mode, GLint top_start, GLint top_end,
GLint top_z, GLint bottom_start, GLint bottom_end,
GLint bottom_z, GLint bottom_domain)
{
if (display_mode == GL_FILL)
tesselate_strip_t_fill(top_start, top_end, top_z, bottom_start,
bottom_end, bottom_z, bottom_domain);
else
tesselate_strip_t_line(top_start, top_end, top_z, bottom_start,
bottom_end, bottom_z, bottom_domain);
}

static void
tesselate_strip_s_fill(GLint top_start, GLint top_end, GLint top_z,
GLint bottom_start, GLint bottom_end, GLint bottom_z,
GLfloat bottom_domain)
{
GLint top_cnt, bottom_cnt, tri_cnt, k;
GLint direction;

top_cnt = top_end - top_start;
direction = (top_cnt >= 0 ? 1 : -1);
bottom_cnt = bottom_end - bottom_start;
while (top_cnt) {
if (bottom_cnt)
tri_cnt = top_cnt / bottom_cnt;
else
tri_cnt = abs(top_cnt);
glBegin(GL_TRIANGLE_FAN);
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
for (k = 0; k <= tri_cnt; k++, top_start += direction)
glEvalPoint2(top_start, top_z);
if (bottom_cnt) {
bottom_start += direction;
top_start -= direction;
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
}
glEnd();
top_cnt -= direction * tri_cnt;
bottom_cnt -= direction;
}
}

static void
tesselate_strip_s_line(GLint top_start, GLint top_end, GLint top_z,
GLint bottom_start, GLint bottom_end, GLint bottom_z,
GLfloat bottom_domain)
{
GLint top_cnt, bottom_cnt, tri_cnt, k;
GLint direction;

top_cnt = top_end - top_start;
direction = (top_cnt >= 0 ? 1 : -1);
bottom_cnt = bottom_end - bottom_start;
glBegin(GL_LINES);
while (top_cnt) {
if (bottom_cnt)
tri_cnt = top_cnt / bottom_cnt;
else
tri_cnt = abs(top_cnt);
for (k = 0; k <= tri_cnt; k++, top_start += direction) {
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
glEvalPoint2(top_start, top_z);
}
if (bottom_cnt) {
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
bottom_start += direction;
top_start -= direction;
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
glEvalPoint2(top_start, top_z);
glEvalCoord2f((GLfloat) bottom_start / bottom_domain,
(GLfloat) bottom_z / bottom_domain);
}
top_cnt -= direction * tri_cnt;
bottom_cnt -= direction;
}
glEnd();
}

static void
tesselate_strip_s(GLenum display_mode, GLint top_start, GLint top_end,
GLint top_z, GLint bottom_start, GLint bottom_end,
GLint bottom_z, GLfloat bottom_domain)
{
if (display_mode == GL_FILL)
tesselate_strip_s_fill(top_start, top_end, top_z, bottom_start,
bottom_end, bottom_z, bottom_domain);
else
tesselate_strip_s_line(top_start, top_end, top_z, bottom_start,
bottom_end, bottom_z, bottom_domain);
}

static void
tesselate_bottom_left_corner(GLenum display_mode, GLfloat s_1, GLfloat t_1)
{
if (display_mode == GL_FILL) {
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(1, 1);
glEvalCoord2f(s_1, 0.0);
glEvalCoord2f(0.0, 0.0);
glEvalCoord2f(0.0, t_1);
}
else {
glBegin(GL_LINES);
glEvalCoord2f(0.0, 0.0);
glEvalCoord2f(0.0, t_1);
glEvalCoord2f(0.0, 0.0);
glEvalPoint2(1, 1);
glEvalCoord2f(0.0, 0.0);
glEvalCoord2f(s_1, 0.0);
}
glEnd();
}

static void
tesselate_bottom_right_corner(GLenum display_mode, GLint v_top,
GLint v_bottom, GLfloat s_1, GLfloat t_1)
{
if (display_mode == GL_FILL) {
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(1, v_top);
glEvalCoord2f(0.0, v_bottom * t_1);
glEvalCoord2f(0.0, (v_bottom + 1) * t_1);
glEvalCoord2f(s_1, (v_bottom + 1) * t_1);
}
else {
glBegin(GL_LINES);
glEvalCoord2f(0.0, (v_bottom + 1) * t_1);
glEvalPoint2(1, v_top);
glEvalCoord2f(0.0, (v_bottom + 1) * t_1);
glEvalCoord2f(0.0, v_bottom * t_1);
glEvalCoord2f(0.0, (v_bottom + 1) * t_1);
glEvalCoord2f(s_1, (v_bottom + 1) * t_1);
}
glEnd();
}

static void
tesselate_top_left_corner(GLenum display_mode, GLint u_right, GLint u_left,
GLfloat s_1, GLfloat t_1)
{
if (display_mode == GL_FILL) {
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(u_right, 1);
glEvalCoord2f((u_left + 1) * s_1, t_1);
glEvalCoord2f((u_left + 1) * s_1, 0.0);
glEvalCoord2f(u_left * s_1, 0.0);
}
else {
glBegin(GL_LINES);
glEvalCoord2f((u_left + 1) * s_1, 0.0);
glEvalPoint2(u_right, 1);
glEvalCoord2f((u_left + 1) * s_1, 0.0);
glEvalCoord2f(u_left * s_1, 0.0);
glEvalCoord2f((u_left + 1) * s_1, 0.0);
glEvalCoord2f((u_left + 1) * s_1, t_1);
}
glEnd();
}

static void
tesselate_top_right_corner(GLenum display_mode, GLint u_left, GLint v_bottom,
GLint u_right, GLint v_top, GLfloat s_1,
GLfloat t_1)
{
if (display_mode == GL_FILL) {
glBegin(GL_TRIANGLE_FAN);
glEvalPoint2(u_left, v_bottom);
glEvalCoord2f((u_right - 1) * s_1, v_top * t_1);
glEvalCoord2f(u_right * s_1, v_top * t_1);
glEvalCoord2f(u_right * s_1, (v_top - 1) * t_1);
}
else {
glBegin(GL_LINES);
glEvalCoord2f(u_right * s_1, v_top * t_1);
glEvalPoint2(u_left, v_bottom);
glEvalCoord2f(u_right * s_1, v_top * t_1);
glEvalCoord2f(u_right * s_1, (v_top - 1) * t_1);
glEvalCoord2f(u_right * s_1, v_top * t_1);
glEvalCoord2f((u_right - 1) * s_1, v_top * t_1);
}
glEnd();
}

/* do mesh mapping of Bezier */
static void
nurbs_map_bezier(GLenum display_mode, GLint * sfactors, GLint * tfactors,
GLint s_bezier_cnt, GLint t_bezier_cnt, GLint s, GLint t)
{
GLint top, bottom, right, left;

if (s == 0) {
top = *(tfactors + t * 3);
bottom = *(tfactors + t * 3 + 1);
}
else if (s == s_bezier_cnt - 1) {
top = *(tfactors + t * 3 + 2);
bottom = *(tfactors + t * 3);
}
else {
top = bottom = *(tfactors + t * 3);
}
if (t == 0) {
left = *(sfactors + s * 3 + 1);
right = *(sfactors + s * 3);
}
else if (t == t_bezier_cnt - 1) {
left = *(sfactors + s * 3);
right = *(sfactors + s * 3 + 2);
}
else {
left = right = *(sfactors + s * 3);
}

if (top > bottom) {
if (left < right) {
glMapGrid2f(right, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 1, right, 1, top);
tesselate_strip_s(display_mode, 1, right, 1, 1, left, 0,
(GLfloat) left);
tesselate_bottom_left_corner(display_mode, (GLfloat) (1.0 / left),
(GLfloat) (1.0 / bottom));
/* tesselate_strip_t(display_mode,1,top,1,1,bottom,0,(GLfloat)bottom);*/
tesselate_strip_t(display_mode, top, 1, 1, bottom, 1, 0,
(GLfloat) bottom);
}
else if (left == right) {
glMapGrid2f(right, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 1, right, 0, top);
/* tesselate_strip_t(display_mode,0,top,1,0,bottom,0,(GLfloat)bottom);*/
tesselate_strip_t(display_mode, top, 0, 1, bottom, 0, 0,
(GLfloat) bottom);
}
else {
glMapGrid2f(left, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 1, left, 0, top - 1);
/* tesselate_strip_t(display_mode,0,top-1,1,0,bottom-1,0,
(GLfloat)bottom);*/
tesselate_strip_t(display_mode, top - 1, 0, 1, bottom - 1, 0, 0,
(GLfloat) bottom);
tesselate_bottom_right_corner(display_mode, top - 1, bottom - 1,
(GLfloat) (1.0 / right),
(GLfloat) (1.0 / bottom));
/* tesselate_strip_s(display_mode,1,left,top-1,1,right,right,
(GLfloat)right);*/
tesselate_strip_s(display_mode, left, 1, top - 1, right, 1, right,
(GLfloat) right);
}
}
else if (top == bottom) {
if (left < right) {
glMapGrid2f(right, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 0, right, 1, top);
tesselate_strip_s(display_mode, 0, right, 1, 0, left, 0,
(GLfloat) left);
}
else if (left == right) {
glMapGrid2f(right, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 0, right, 0, top);
}
else {
glMapGrid2f(left, 0.0, 1.0, top, 0.0, 1.0);
glEvalMesh2(display_mode, 0, left, 0, top - 1);
/* tesselate_strip_s(display_mode,0,left,top-1,0,right,right,
(GLfloat)right);*/
tesselate_strip_s(display_mode, left, 0, top - 1, right, 0, right,
(GLfloat) right);
}
}
else {
if (left < right) {
glMapGrid2f(right, 0.0, 1.0, bottom, 0.0, 1.0);
glEvalMesh2(display_mode, 0, right - 1, 1, bottom);
tesselate_strip_s(display_mode, 0, right - 1, 1, 0, left - 1, 0,
(GLfloat) left);
tesselate_top_left_corner(display_mode, right - 1, left - 1,
(GLfloat) (1.0 / left),
(GLfloat) (1.0 / top));
tesselate_strip_t(display_mode, 1, bottom, right - 1, 1, top, top,
(GLfloat) top);
}
else if (left == right) {
glMapGrid2f(right, 0.0, 1.0, bottom, 0.0, 1.0);
glEvalMesh2(display_mode, 0, right - 1, 0, bottom);
tesselate_strip_t(display_mode, 0, bottom, right - 1, 0, top, top,
(GLfloat) top);
}
else {
glMapGrid2f(left, 0.0, 1.0, bottom, 0.0, 1.0);
glEvalMesh2(display_mode, 0, left - 1, 0, bottom - 1);
tesselate_strip_t(display_mode, 0, bottom - 1, left - 1, 0, top - 1,
top, (GLfloat) top);
tesselate_top_right_corner(display_mode, left - 1, bottom - 1, right,
top, (GLfloat) (1.0 / right),
(GLfloat) (1.0 / top));
/* tesselate_strip_s(display_mode,0,left-1,bottom-1,0,right-1,right,
(GLfloat)right);*/
tesselate_strip_s(display_mode, left - 1, 0, bottom - 1, right - 1,
0, right, (GLfloat) right);
}
}
}

/* draw NURBS surface in OUTLINE POLYGON mode */
static void
draw_polygon_mode(GLenum display_mode, GLUnurbsObj * nobj,
new_ctrl_type * new_ctrl, GLint * sfactors,
GLint * tfactors)
{
GLsizei offset;
GLint t_bezier_cnt, s_bezier_cnt;
GLboolean do_color, do_normal, do_texture;
GLint i, j;

t_bezier_cnt = new_ctrl->t_bezier_cnt;
s_bezier_cnt = new_ctrl->s_bezier_cnt;
glEnable(nobj->surface.geom.type);
if (new_ctrl->color_ctrl) {
glEnable(nobj->surface.color.type);
do_color = GL_TRUE;
}
else
do_color = GL_FALSE;
if (new_ctrl->normal_ctrl) {
glEnable(nobj->surface.normal.type);
do_normal = GL_TRUE;
}
else
do_normal = GL_FALSE;
if (new_ctrl->texture_ctrl) {
glEnable(nobj->surface.texture.type);
do_texture = GL_TRUE;
}
else
do_texture = GL_FALSE;
for (j = 0; j < s_bezier_cnt; j++) {
for (i = 0; i < t_bezier_cnt; i++) {
offset = j * t_bezier_cnt + i;
if (fine_culling_test_3D(nobj, *(new_ctrl->geom_offsets + offset),
nobj->surface.geom.sorder,
nobj->surface.geom.torder,
new_ctrl->geom_s_stride,
new_ctrl->geom_t_stride,
nobj->surface.geom.dim)) continue;
glMap2f(nobj->surface.geom.type, 0.0, 1.0, new_ctrl->geom_s_stride,
nobj->surface.geom.sorder, 0.0, 1.0, new_ctrl->geom_t_stride,
nobj->surface.geom.torder,
*(new_ctrl->geom_offsets + offset));
if (do_color) {
glMap2f(nobj->surface.color.type, 0.0, 1.0,
new_ctrl->color_s_stride, nobj->surface.color.sorder,
0.0, 1.0, new_ctrl->color_t_stride,
nobj->surface.color.torder,
*(new_ctrl->color_offsets + offset));
}
if (do_normal) {
glMap2f(nobj->surface.normal.type, 0.0, 1.0,
new_ctrl->normal_s_stride, nobj->surface.normal.sorder,
0.0, 1.0, new_ctrl->normal_t_stride,
nobj->surface.normal.torder,
*(new_ctrl->normal_offsets + offset));
}
if (do_texture) {
glMap2f(nobj->surface.texture.type, 0.0, 1.0,
new_ctrl->texture_s_stride, nobj->surface.texture.sorder,
0.0, 1.0, new_ctrl->texture_t_stride,
nobj->surface.texture.torder,
*(new_ctrl->texture_offsets + offset));
}
/* glMapGrid2f(sfactors[j*3+0],0.0,1.0,tfactors[i*3+0],0.0,1.0);
glEvalMesh2(display_mode,0,sfactors[j*3+0],0,tfactors[i*3+0]);*/
nurbs_map_bezier(display_mode, sfactors, tfactors, s_bezier_cnt,
t_bezier_cnt, j, i);
}
}
}

/* draw NURBS surface in OUTLINE POLYGON mode */
#if 0
static void
draw_patch_mode(GLenum display_mode, GLUnurbsObj * nobj,
new_ctrl_type * new_ctrl, GLint * sfactors, GLint * tfactors)
{
GLsizei offset;
GLint t_bezier_cnt, s_bezier_cnt;
GLboolean do_color, do_normal, do_texture;
GLint i, j;

t_bezier_cnt = new_ctrl->t_bezier_cnt;
s_bezier_cnt = new_ctrl->s_bezier_cnt;
glEnable(nobj->surface.geom.type);
if (new_ctrl->color_ctrl) {
glEnable(nobj->surface.color.type);
do_color = GL_TRUE;
}
else
do_color = GL_FALSE;
if (new_ctrl->normal_ctrl) {
glEnable(nobj->surface.normal.type);
do_normal = GL_TRUE;
}
else
do_normal = GL_FALSE;
if (new_ctrl->texture_ctrl) {
glEnable(nobj->surface.texture.type);
do_texture = GL_TRUE;
}
else
do_texture = GL_FALSE;
for (j = 0; j < s_bezier_cnt; j++) {
for (i = 0; i < t_bezier_cnt; i++) {
offset = j * t_bezier_cnt + i;
if (fine_culling_test_3D(nobj, *(new_ctrl->geom_offsets + offset),
nobj->surface.geom.sorder,
nobj->surface.geom.torder,
new_ctrl->geom_s_stride,
new_ctrl->geom_t_stride,
nobj->surface.geom.dim)) continue;
glMap2f(nobj->surface.geom.type, 0.0, 1.0, new_ctrl->geom_s_stride,
nobj->surface.geom.sorder, 0.0, 1.0, new_ctrl->geom_t_stride,
nobj->surface.geom.torder,
*(new_ctrl->geom_offsets + offset));
if (do_color) {
glMap2f(nobj->surface.color.type, 0.0, 1.0,
new_ctrl->color_s_stride, nobj->surface.color.sorder,
0.0, 1.0, new_ctrl->color_t_stride,
nobj->surface.color.torder,
*(new_ctrl->color_offsets + offset));
}
if (do_normal) {
glMap2f(nobj->surface.normal.type, 0.0, 1.0,
new_ctrl->normal_s_stride, nobj->surface.normal.sorder,
0.0, 1.0, new_ctrl->normal_t_stride,
nobj->surface.normal.torder,
*(new_ctrl->normal_offsets + offset));
}
if (do_texture) {
glMap2f(nobj->surface.texture.type, 0.0, 1.0,
new_ctrl->texture_s_stride, nobj->surface.texture.sorder,
0.0, 1.0, new_ctrl->texture_t_stride,
nobj->surface.texture.torder,
*(new_ctrl->texture_offsets + offset));
}
nurbs_map_bezier(display_mode, sfactors, tfactors, s_bezier_cnt,
t_bezier_cnt, i, j);
/* glMapGrid2f(sfactors[j],0.0,1.0,tfactors[i],0.0,1.0);
glEvalMesh2(display_mode,0,sfactors[j],0,tfactors[i]);*/
}
}
}
#endif

static void
init_new_ctrl(new_ctrl_type * p)
{
p->geom_ctrl = p->color_ctrl = p->normal_ctrl = p->texture_ctrl = NULL;
p->geom_offsets = p->color_offsets = p->normal_offsets =
p->texture_offsets = NULL;
p->s_bezier_cnt = p->t_bezier_cnt = 0;
}

static GLenum
augment_new_ctrl(GLUnurbsObj * nobj, new_ctrl_type * p)
{
GLsizei offset_size;
GLint i, j;

p->s_bezier_cnt = (p->geom_s_pt_cnt) / (nobj->surface.geom.sorder);
p->t_bezier_cnt = (p->geom_t_pt_cnt) / (nobj->surface.geom.torder);
offset_size = (p->s_bezier_cnt) * (p->t_bezier_cnt);
p->geom_t_stride = nobj->surface.geom.dim;
p->geom_s_stride = (p->geom_t_pt_cnt) * (nobj->surface.geom.dim);
p->color_t_stride = nobj->surface.color.dim;
p->color_s_stride = (p->color_t_pt_cnt) * (nobj->surface.color.dim);
p->normal_t_stride = nobj->surface.normal.dim;
p->normal_s_stride = (p->normal_t_pt_cnt) * (nobj->surface.normal.dim);
p->texture_t_stride = nobj->surface.texture.dim;
p->texture_s_stride = (p->texture_t_pt_cnt) * (nobj->surface.texture.dim);
if (
(p->geom_offsets =
(GLfloat **) malloc(sizeof(GLfloat *) * offset_size)) == NULL) {
call_user_error(nobj, GLU_OUT_OF_MEMORY);
return GLU_ERROR;
}
if (p->color_ctrl)
if (
(p->color_offsets =
(GLfloat **) malloc(sizeof(GLfloat *) * offset_size)) == NULL) {
free_new_ctrl(p);
call_user_error(nobj, GLU_OUT_OF_MEMORY);
return GLU_ERROR;
}
if (p->normal_ctrl)
if (
(p->normal_offsets =
(GLfloat **) malloc(sizeof(GLfloat *) * offset_size)) == NULL) {
free_new_ctrl(p);
call_user_error(nobj, GLU_OUT_OF_MEMORY);
return GLU_ERROR;
}
if (p->texture_ctrl)
if (
(p->texture_offsets =
(GLfloat **) malloc(sizeof(GLfloat *) * offset_size)) == NULL) {
free_new_ctrl(p);
call_user_error(nobj, GLU_OUT_OF_MEMORY);
return GLU_ERROR;
}
for (i = 0; i < p->s_bezier_cnt; i++)
for (j = 0; j < p->t_bezier_cnt; j++)
*(p->geom_offsets + i * (p->t_bezier_cnt) + j) =
p->geom_ctrl + i * (nobj->surface.geom.sorder) *
(nobj->surface.geom.dim) * (p->geom_t_pt_cnt) +
j * (nobj->surface.geom.dim) * (nobj->surface.geom.torder);
if (p->color_ctrl)
for (i = 0; i < p->s_bezier_cnt; i++)
for (j = 0; j < p->t_bezier_cnt; j++)
*(p->color_offsets + i * (p->t_bezier_cnt) + j) =
p->color_ctrl + i * (nobj->surface.color.sorder) *
(nobj->surface.color.dim) * (p->color_t_pt_cnt) +
j * (nobj->surface.color.dim) * (nobj->surface.color.torder);
if (p->normal_ctrl)
for (i = 0; i < p->s_bezier_cnt; i++)
for (j = 0; j < p->t_bezier_cnt; j++)
*(p->normal_offsets + i * (p->t_bezier_cnt) + j) =
p->normal_ctrl + i * (nobj->surface.normal.sorder) *
(nobj->surface.normal.dim) * (p->normal_t_pt_cnt) +
j * (nobj->surface.normal.dim) * (nobj->surface.normal.torder);
if (p->texture_ctrl)
for (i = 0; i < p->s_bezier_cnt; i++)
for (j = 0; j < p->t_bezier_cnt; j++)
*(p->texture_offsets + i * (p->t_bezier_cnt) + j) =
p->texture_ctrl + i * (nobj->surface.texture.sorder) *
(nobj->surface.texture.dim) * (p->texture_t_pt_cnt) +
j * (nobj->surface.texture.dim) *
(nobj->surface.texture.torder);
return GLU_NO_ERROR;
}

/* main NURBS surface procedure */
void
do_nurbs_surface(GLUnurbsObj * nobj)
{
GLint *sfactors, *tfactors;
new_ctrl_type new_ctrl;

/* test user supplied data */
if (test_nurbs_surfaces(nobj) != GLU_NO_ERROR)
return;

init_new_ctrl(&new_ctrl);

if (convert_surfs(nobj, &new_ctrl) != GLU_NO_ERROR)
return;
if (augment_new_ctrl(nobj, &new_ctrl) != GLU_NO_ERROR)
return;
switch (nobj->sampling_method) {
case GLU_PATH_LENGTH:
if (glu_do_sampling_3D(nobj, &new_ctrl, &sfactors, &tfactors) !=
GLU_NO_ERROR) {
free_new_ctrl(&new_ctrl);
return;
}
break;
case GLU_DOMAIN_DISTANCE:
if (glu_do_sampling_uv(nobj, &new_ctrl, &sfactors, &tfactors) !=
GLU_NO_ERROR) {
free_new_ctrl(&new_ctrl);
return;
}
break;
case GLU_PARAMETRIC_ERROR:
if (glu_do_sampling_param_3D(nobj, &new_ctrl, &sfactors, &tfactors) !=
GLU_NO_ERROR) {
free_new_ctrl(&new_ctrl);
return;
}
break;
default:
abort();
}
glFrontFace(GL_CW);
switch (nobj->display_mode) {
case GLU_FILL:
/* if(polygon_trimming(nobj,&new_ctrl,sfactors,tfactors)==GLU_NO_ERROR)*/
draw_polygon_mode(GL_FILL, nobj, &new_ctrl, sfactors, tfactors);
break;
case GLU_OUTLINE_POLYGON:
/* TODO - missing trimming handeling */
/* just for now - no OUTLINE_PATCH mode
draw_patch_mode(GL_LINE,nobj,&new_ctrl,sfactors,tfactors);
break; */
case GLU_OUTLINE_PATCH:
/* if(polygon_trimming(nobj,&new_ctrl,sfactors,tfactors)==GLU_NO_ERROR)*/
draw_polygon_mode(GL_LINE, nobj, &new_ctrl, sfactors, tfactors);
break;
default:
abort(); /* TODO: is this OK? */
}
free(sfactors);
free(tfactors);
free_new_ctrl(&new_ctrl);
}

Subversion Repositories shark

(root)/shark/trunk/ports/mesa/src-glu/nurbssrf.c @ 1689 - Rev 55