2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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:
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.
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
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.
33 #ifndef _BEZIERPATCH_H
34 #define _BEZIERPATCH_H
36 typedef struct bezierPatch{
37 float umin, vmin, umax, vmax;
38 int uorder; /*order= degree + 1*/
42 *the control points are stored in a one dimensional array.
43 *the surface is defined as:
44 * s(u,v) = sum_{i,j} P(i,j) * B_i(u) * B_j(v).
45 *where P(i,j) are the control points, B_i(.) are Bezier
47 *Each control point can have dimension 3 or 4: (x,y,z,w).
48 *The components of P(i,j) are stored in a one dimensional
52 * P[0,0], P[0,1], ..., P[0,vorder-1],
53 * P[1,0], P[1,1], ..., P[1,vorder-1],
55 * P[uorder-1,0], P[uorder-1,1], ..., P[uorder-1,vorder-1].
61 *in case we have to manage multiple bezierPatches.
63 struct bezierPatch *next;
71 bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension);
73 bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension, int ustride, int vstride, float *ctlpoints);
76 bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b);
78 void bezierPatchDelete(bezierPatch *b);
80 void bezierPatchDeleteList(bezierPatch *b);
82 void bezierPatchPrint(bezierPatch *b);
84 void bezierPatchPrintList(bezierPatch *list);
86 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
88 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float retNormal[]);
90 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
92 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[]);
95 void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso);
97 void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso);