Initial revision

1 files changed, 252 insertions, 0 deletions

diff --git a/src/glu/mesa/nurbs.h b/src/glu/mesa/nurbs.h
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+/* $Id: nurbs.h,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * Copyright (C) 1995-1999  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 1.1  1999/08/19 00:55:42  jtg
+ * Initial revision
+ *
+ * Revision 1.5  1999/02/27 13:55:31  brianp
+ * fixed BeOS-related GLU typedef problems
+ *
+ * Revision 1.4  1999/01/03 03:23:15  brianp
+ * now using GLAPIENTRY and GLCALLBACK keywords (Ted Jump)
+ *
+ * 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;
+
+struct GLUnurbs {
+	GLboolean		culling;
+	GLenum			error;
+	void			(GLCALLBACK *error_callback)( GLenum err );
+	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