/* $Id: nurbs.h,v 1.3 1997/05/27 03:18:23 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 2.3 * 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: nurbs.h,v $ * Revision 1.3 1997/05/27 03:18:23 brianp * minor clean-up * * Revision 1.2 1997/05/27 03:00:16 brianp * incorporated Bogdan's new NURBS code * * Revision 1.1 1996/09/27 01:19:39 brianp * Initial revision * */ /* * NURBS implementation written by Bogdan Sikorski (bogdan@cira.it) * See README2 for more info. */ #ifndef NURBS_H #define NURBS_H #define EPSILON 1e-06 /* epsilon for double precision compares */ typedef enum { GLU_NURBS_CURVE, GLU_NURBS_SURFACE, GLU_NURBS_TRIM, GLU_NURBS_NO_TRIM, GLU_NURBS_TRIM_DONE, GLU_NURBS_NONE } GLU_nurbs_enum; typedef enum { GLU_TRIM_NURBS, GLU_TRIM_PWL } GLU_trim_enum; typedef struct { GLint sknot_count; GLfloat *sknot; GLint tknot_count; GLfloat *tknot; GLint s_stride; GLint t_stride; GLfloat *ctrlarray; GLint sorder; GLint torder; GLint dim; GLenum type; } surface_attribs; typedef struct { surface_attribs geom; surface_attribs color; surface_attribs texture; surface_attribs normal; } nurbs_surface; typedef struct { GLint knot_count; GLfloat *knot; GLint stride; GLfloat *ctrlarray; GLint order; GLint dim; GLenum type; } curve_attribs; typedef struct { GLint pt_count; GLfloat *ctrlarray; GLint stride; GLint dim; GLenum type; } pwl_curve_attribs; typedef struct { curve_attribs geom; curve_attribs color; curve_attribs texture; curve_attribs normal; } nurbs_curve; typedef struct trim_list_str { GLU_trim_enum trim_type; union { pwl_curve_attribs pwl_curve; curve_attribs nurbs_curve; } curve; struct trim_list_str *next; } trim_list; typedef struct seg_trim_str { GLfloat *points; GLint pt_cnt,seg_array_len; struct seg_trim_str *next; } trim_segments; typedef struct nurbs_trim_str { trim_list *trim_loop; trim_segments *segments; struct nurbs_trim_str *next; } nurbs_trim; typedef struct { GLfloat model[16],proj[16],viewport[4]; } culling_and_sampling_str; #if defined(AMIGA) && defined(__PPC__) void error_callbackPPC( GLenum err ); #endif struct GLUnurbsObj { GLboolean culling; GLenum error; void (CALLBACK *error_callback)( GLenum err ); #if defined(AMIGA) && defined(__PPC__) void (CALLBACK *error_callbackPPC)( GLenum err ); #endif GLenum display_mode; GLU_nurbs_enum nurbs_type; GLboolean auto_load_matrix; culling_and_sampling_str sampling_matrices; GLenum sampling_method; GLfloat sampling_tolerance; GLfloat parametric_tolerance; GLint u_step, v_step; nurbs_surface surface; nurbs_curve curve; nurbs_trim *trim; }; typedef struct { GLfloat *knot; GLint nknots; GLfloat *unified_knot; GLint unified_nknots; GLint order; GLint t_min,t_max; GLint delta_nknots; GLboolean open_at_begin,open_at_end; GLfloat *new_knot; GLfloat *alpha; } knot_str_type; typedef struct { GLfloat *geom_ctrl; GLint geom_s_stride,geom_t_stride; GLfloat **geom_offsets; GLint geom_s_pt_cnt,geom_t_pt_cnt; GLfloat *color_ctrl; GLint color_s_stride,color_t_stride; GLfloat **color_offsets; GLint color_s_pt_cnt,color_t_pt_cnt; GLfloat *normal_ctrl; GLint normal_s_stride,normal_t_stride; GLfloat **normal_offsets; GLint normal_s_pt_cnt,normal_t_pt_cnt; GLfloat *texture_ctrl; GLint texture_s_stride,texture_t_stride; GLfloat **texture_offsets; GLint texture_s_pt_cnt,texture_t_pt_cnt; GLint s_bezier_cnt,t_bezier_cnt; } new_ctrl_type; extern void call_user_error( GLUnurbsObj *nobj, GLenum error ); extern GLenum test_knot(GLint nknots, GLfloat *knot, GLint order); extern GLenum explode_knot(knot_str_type *the_knot); extern GLenum calc_alphas(knot_str_type *the_knot); extern GLenum calc_new_ctrl_pts(GLfloat *ctrl,GLint stride,knot_str_type *the_knot, GLint dim,GLfloat **new_ctrl,GLint *ncontrol); extern GLenum glu_do_sampling_crv(GLUnurbsObj *nobj, GLfloat *new_ctrl,GLint n_ctrl, GLint order,GLint dim,GLint **factors); extern GLenum glu_do_sampling_3D(GLUnurbsObj *nobj, new_ctrl_type *new_ctrl, int **sfactors, GLint **tfactors); extern GLenum glu_do_sampling_uv(GLUnurbsObj *nobj, new_ctrl_type *new_ctrl, int **sfactors, GLint **tfactors); extern GLenum glu_do_sampling_param_3D(GLUnurbsObj *nobj, new_ctrl_type *new_ctrl, int **sfactors, GLint **tfactors); extern GLboolean fine_culling_test_2D(GLUnurbsObj *nobj, GLfloat *ctrl, GLint n_ctrl, GLint stride, GLint dim); extern GLboolean fine_culling_test_3D(GLUnurbsObj *nobj, GLfloat *ctrl, GLint s_n_ctrl, GLint t_n_ctrl, GLint s_stride, GLint t_stride, GLint dim); extern void do_nurbs_curve( GLUnurbsObj *nobj); extern void do_nurbs_surface( GLUnurbsObj *nobj); extern GLenum patch_trimming(GLUnurbsObj *nobj,new_ctrl_type *new_ctrl, GLint *sfactors, GLint *tfactors); extern void collect_unified_knot(knot_str_type *dest, knot_str_type *src, GLfloat maximal_min_knot, GLfloat minimal_max_knot); extern GLenum select_knot_working_range(GLUnurbsObj *nobj,knot_str_type *geom_knot, knot_str_type *color_knot, knot_str_type *normal_knot, knot_str_type *texture_knot); extern void free_unified_knots(knot_str_type *geom_knot, knot_str_type *color_knot, knot_str_type *normal_knot, knot_str_type *texture_knot); #endif