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
Indexes created Tue Jul 28 00:24:17 UTC 2026