diff options
Diffstat (limited to 'src/glu/mesa/nurbssrf.c')
| -rw-r--r-- | src/glu/mesa/nurbssrf.c | 1422 |
1 files changed, 1422 insertions, 0 deletions
diff --git a/src/glu/mesa/nurbssrf.c b/src/glu/mesa/nurbssrf.c new file mode 100644 index 00000000000..57eb9569862 --- /dev/null +++ b/src/glu/mesa/nurbssrf.c @@ -0,0 +1,1422 @@ +/* $Id: nurbssrf.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 2.4 + * Copyright (C) 1995-1997 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. + */ + + +/* + * $Log: nurbssrf.c,v $ + * Revision 1.1 1999/08/19 00:55:42 jtg + * Initial revision + * + * Revision 1.7 1997/07/24 01:28:44 brianp + * changed precompiled header symbol from PCH to PC_HEADER + * + * Revision 1.6 1997/06/23 00:22:07 brianp + * include <string.h> + * + * Revision 1.5 1997/05/28 02:29:38 brianp + * added support for precompiled headers (PCH), inserted APIENTRY keyword + * + * Revision 1.4 1997/05/27 03:20:35 brianp + * minor clean-up + * + * Revision 1.3 1997/05/27 03:00:16 brianp + * incorporated Bogdan's new NURBS code + * + * Revision 1.2 1996/09/27 23:13:02 brianp + * added return 0 to get_surface_dim() to silence warning + * + * Revision 1.1 1996/09/27 01:19:39 brianp + * Initial revision + * + */ + + +/* + * NURBS implementation written by Bogdan Sikorski ([email protected]) + * 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; +} + +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 */ +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(); +} + +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; + } +} + +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); +} + + +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; + } +} + +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(); +} + +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); +} + +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(); +} + +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(); +} + +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(); +} + +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 + + + +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; +} + +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); +} + |