1 /*
2 ** License Applicability. Except to the extent portions of this file are
3 ** made subject to an alternative license as permitted in the SGI Free
4 ** Software License B, Version 1.1 (the "License"), the contents of this
5 ** file are subject only to the provisions of the License. You may not use
6 ** this file except in compliance with the License. You may obtain a copy
7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9 **
10 ** http://oss.sgi.com/projects/FreeB
11 **
12 ** Note that, as provided in the License, the Software is distributed on an
13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17 **
18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21 ** Copyright in any portions created by third parties is as indicated
22 ** elsewhere herein. All Rights Reserved.
23 **
24 ** Additional Notice Provisions: The application programming interfaces
25 ** established by SGI in conjunction with the Original Code are The
26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31 ** published by SGI, but has not been independently verified as being
32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
33 **
34 */
35 /*
36 */
37 
38 #include "gluos.h"
39 //#include <stdlib.h>
40 //#include <stdio.h>
41 #include <assert.h>
42 #include <GL/glu.h> /*for drawing bzier patch*/
43 #include "bezierPatch.h"
44 #include "bezierEval.h"
45 
46 /*
47  *allocate an instance of bezierPatch. The control points are unknown. But
48  *the space of this array is allocated with size of
49  *   uorder*vorder*dimension
50  *
51  */
52 bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int uorder, int vorder, int dimension)
53 {
54   bezierPatch* ret = (bezierPatch*) malloc(sizeof(bezierPatch));
55   assert(ret);
56   ret->umin = umin;
57   ret->vmin = vmin;
58   ret->umax = umax;
59   ret->vmax = vmax;
60   ret->uorder = uorder;
61   ret->vorder = vorder;
62   ret->dimension = dimension;
63   ret->ctlpoints = (float*) malloc(sizeof(float) * dimension * uorder * vorder);
64   assert(ret->ctlpoints);
65 
66   ret->next = NULL;
67 
68   return ret;
69 }
70 
71 bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int uorder, int vorder, int dimension, int ustride, int vstride,  float* ctlpoints)
72 {
73   bezierPatch* ret = (bezierPatch*) malloc(sizeof(bezierPatch));
74   assert(ret);
75   ret->umin = umin;
76   ret->vmin = vmin;
77   ret->umax = umax;
78   ret->vmax = vmax;
79   ret->uorder = uorder;
80   ret->vorder = vorder;
81   ret->dimension = dimension;
82   ret->ctlpoints = (float*) malloc(sizeof(float) * dimension * uorder * vorder);
83   assert(ret->ctlpoints);
84 
85   /*copy the control points there*/
86   int the_ustride = vorder * dimension;
87   int the_vstride = dimension;
88   for(int i=0; i<uorder; i++)
89     for(int j=0; j<vorder; j++)
90       for(int k=0; k<dimension; k++)
91 	ret->ctlpoints[i * the_ustride + j*the_vstride+k] = ctlpoints[i*ustride+j*vstride+k];
92 
93   ret->next = NULL;
94 
95   return ret;
96 }
97 
98 /*
99  *deallocate the space as allocated by Make
100  */
101 void bezierPatchDelete(bezierPatch *b)
102 {
103   free(b->ctlpoints);
104   free(b);
105 }
106 
107 /*delete the whole linked list
108  */
109 void bezierPatchDeleteList(bezierPatch *b)
110 {
111   bezierPatch *temp;
112   while (b != NULL) {
113     temp = b;
114     b = b->next;
115     bezierPatchDelete(temp);
116   }
117 }
118 
119 bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b)
120 {
121   b->next = list;
122   return b;
123 }
124 
125 /*print the data stored in this patch*/
126 void bezierPatchPrint(bezierPatch *b)
127 {
128   printf("bezierPatch:\n");
129   printf("umin,umax=(%f,%f), (vmin, vmax)=(%f,%f)\n", b->umin, b->umax, b->vmin, b->vmax);
130   printf("uorder=%i, vorder=%i\n", b->uorder, b->vorder);
131   printf("idmension = %i\n", b->dimension);
132 }
133 
134 /*print the whole list*/
135 void bezierPatchPrintList(bezierPatch *list)
136 {
137   bezierPatch* temp;
138   for(temp=list; temp != NULL; temp = temp->next)
139     bezierPatchPrint(temp);
140 }
141 
142 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[])
143 {
144   if(   u >= b->umin && u<= b->umax
145      && v >= b->vmin && v<= b->vmax)
146     {
147 
148       bezierSurfEval(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
149 
150      }
151   else if(b->next != NULL)
152     bezierPatchEval(b->next, u,v, ret);
153   else
154     bezierSurfEval(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
155 }
156 
157 /*the returned normal is normlized
158  */
159 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[])
160 {
161   bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
162 
163   if(   u >= b->umin && u<= b->umax
164      && v >= b->vmin && v<= b->vmax)
165     {
166       bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
167      }
168   else if(b->next != NULL)
169     bezierPatchEvalNormal(b->next, u,v, ret);
170   else
171     bezierSurfEvalNormal(b->umin, b->umax, b->uorder, b->vmin, b->vmax, b->vorder, b->dimension, b->ctlpoints, b->dimension * b->vorder, b->dimension, u, v, ret);
172 
173 }
174 
175 void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso)
176 {
177   if(bpatch->dimension == 3)
178     glMap2f(GL_MAP2_VERTEX_3, bpatch->umin, bpatch->umax, 3*bpatch->vorder, bpatch->uorder, bpatch->vmin, bpatch->vmax,3, bpatch->vorder, (GLfloat*) bpatch->ctlpoints);
179   else
180     glMap2f(GL_MAP2_VERTEX_4, bpatch->umin, bpatch->umax, 4*bpatch->vorder, bpatch->uorder, bpatch->vmin, bpatch->vmax,3, bpatch->vorder, (GLfloat*) bpatch->ctlpoints);
181 
182   glMapGrid2f(u_reso, bpatch->umin, bpatch->umax,
183 	      v_reso, bpatch->vmin, bpatch->vmax);
184   glEvalMesh2(GL_LINE, 0, u_reso, 0, v_reso);
185 }
186 
187 void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso)
188 {
189   bezierPatch *temp;
190 glEnable(GL_LIGHTING);
191 glEnable(GL_LIGHT0);
192 glEnable(GL_MAP2_VERTEX_3);
193 glEnable(GL_AUTO_NORMAL);
194 glEnable(GL_NORMALIZE);
195 glColor3f(1,0,0);
196 #ifdef DEBUG
197 printf("mapmap\n");
198 #endif
199 
200 
201   for(temp = list; temp != NULL; temp = temp->next)
202     bezierPatchDraw(temp, u_reso, v_reso);
203 }
204 
205 
206 
207