1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31/*
32 * glcurveval.h
33 *
34 */
35
36#ifndef __gluglcurveval_h_
37#define __gluglcurveval_h_
38
39#include "gluos.h"
40#include <GL/gl.h>
41#include <GL/glu.h>
42#include "basiccrveval.h"
43
44class CurveMap;
45
46/*for internal evaluator callback stuff*/
47#ifndef IN_MAX_BEZIER_ORDER
48#define IN_MAX_BEZIER_ORDER 40 /*XXX should be bigger than machine order*/
49#endif
50
51#ifndef IN_MAX_DIMENSION
52#define IN_MAX_DIMENSION 4
53#endif
54
55typedef struct curveEvalMachine{
56  REAL uprime; //cached previously evaluated uprime
57  int k; //the dimension
58  REAL u1;
59  REAL u2;
60  int ustride;
61  int uorder;
62  REAL ctlpoints[IN_MAX_BEZIER_ORDER*IN_MAX_DIMENSION];
63  REAL ucoeff[IN_MAX_BEZIER_ORDER];//cache the polynomial values
64} curveEvalMachine;
65
66class OpenGLCurveEvaluator : public BasicCurveEvaluator  {
67public:
68			OpenGLCurveEvaluator(void);
69			virtual ~OpenGLCurveEvaluator(void);
70    void		range1f(long, REAL *, REAL *);
71    void		domain1f(REAL, REAL);
72    void		addMap(CurveMap *);
73
74    void		enable(long);
75    void		disable(long);
76    void		bgnmap1f(long);
77    void		map1f(long, REAL, REAL, long, long, REAL *);
78    void		mapgrid1f(long, REAL, REAL);
79    void		mapmesh1f(long, long, long);
80    void		evalpoint1i(long);
81    void		evalcoord1f(long, REAL);
82    void		endmap1f(void);
83
84    void		bgnline(void);
85    void		endline(void);
86
87    void                put_vertices_call_back(int flag)
88      {
89	output_triangles = flag;
90      }
91#ifdef _WIN32
92    void               putCallBack(GLenum which, void (GLAPIENTRY *fn)() );
93#else
94    void               putCallBack(GLenum which, _GLUfuncptr fn );
95#endif
96    void               set_callback_userData(void *data)
97      {
98	userData = data;
99      }
100
101/*------------------begin for curveEvalMachine------------*/
102curveEvalMachine em_vertex;
103curveEvalMachine em_normal;
104curveEvalMachine em_color;
105curveEvalMachine em_texcoord;
106int vertex_flag; //whether there is a vertex map or not
107int normal_flag; //whether there is a normal map or not
108int color_flag; //whether there is a color map or not
109int texcoord_flag; //whether there is a texture map or not
110
111REAL global_grid_u0;
112REAL global_grid_u1;
113int global_grid_nu;
114
115void inMap1f(int which, //0: vert, 1: norm, 2: color, 3: tex
116	     int dimension,
117	     REAL ulower,
118	     REAL uupper,
119	     int ustride,
120	     int uorder,
121	     REAL *ctlpoints);
122
123void inPreEvaluate(int order, REAL vprime, REAL *coeff);
124void inDoDomain1(curveEvalMachine *em, REAL u, REAL *retPoint);
125void inDoEvalCoord1(REAL u);
126void inMapMesh1f(int umin, int umax);
127
128void     (GLAPIENTRY *beginCallBackN) (GLenum type);
129void     (GLAPIENTRY *endCallBackN)   (void);
130void     (GLAPIENTRY *vertexCallBackN) (const GLfloat *vert);
131void     (GLAPIENTRY *normalCallBackN) (const GLfloat *normal);
132void     (GLAPIENTRY *colorCallBackN) (const GLfloat *color);
133void     (GLAPIENTRY *texcoordCallBackN) (const GLfloat *texcoord);
134
135void     (GLAPIENTRY *beginCallBackData) (GLenum type, void* data);
136void     (GLAPIENTRY *endCallBackData)   (void* data);
137void     (GLAPIENTRY *vertexCallBackData) (const GLfloat *vert, void* data);
138void     (GLAPIENTRY *normalCallBackData) (const GLfloat *normal, void* data);
139void     (GLAPIENTRY *colorCallBackData) (const GLfloat *color, void* data);
140void     (GLAPIENTRY *texcoordCallBackData) (const GLfloat *texcoord, void* data);
141
142void* userData; //the opaque pointer for Data callback functions
143void  beginCallBack(GLenum type, void* data);
144void endCallBack(void* data);
145void vertexCallBack(const GLfloat *vert, void *data);
146void normalCallBack(const GLfloat *normal, void* data);
147void colorCallBack(const  GLfloat *color, void* data);
148void texcoordCallBack(const GLfloat *texcoord, void* data);
149
150
151/*------------------end   for curveEvalMachine------------*/
152
153private:
154    int output_triangles; //true 1; false 0
155};
156
157#endif /* __gluglcurveval_h_ */
158