| /* |
| * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) |
| * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice including the dates of first publication and |
| * either this permission notice or a reference to |
| * http://oss.sgi.com/projects/FreeB/ |
| * shall be included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF |
| * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| * |
| * Except as contained in this notice, the name of Silicon Graphics, Inc. |
| * shall not be used in advertising or otherwise to promote the sale, use or |
| * other dealings in this Software without prior written authorization from |
| * Silicon Graphics, Inc. |
| */ |
| /* |
| ** $Header: /cvs/bao-parsec/pkgs/libs/mesa/src/src/glu/sgi/libnurbs/interface/bezierPatch.h,v 1.1.1.1 2012/03/29 17:22:17 uid42307 Exp $ |
| */ |
| |
| #ifndef _BEZIERPATCH_H |
| #define _BEZIERPATCH_H |
| |
| typedef struct bezierPatch{ |
| float umin, vmin, umax, vmax; |
| int uorder; /*order= degree + 1*/ |
| int vorder; |
| |
| /* |
| *the control points are stored in a one dimensional array. |
| *the surface is defined as: |
| * s(u,v) = sum_{i,j} P(i,j) * B_i(u) * B_j(v). |
| *where P(i,j) are the control points, B_i(.) are Bezier |
| *basis functions. |
| *Each control point can have dimension 3 or 4: (x,y,z,w). |
| *The components of P(i,j) are stored in a one dimensional |
| *array: |
| * ctlpoints[] |
| *in the order of: |
| * P[0,0], P[0,1], ..., P[0,vorder-1], |
| * P[1,0], P[1,1], ..., P[1,vorder-1], |
| * ... |
| * P[uorder-1,0], P[uorder-1,1], ..., P[uorder-1,vorder-1]. |
| */ |
| int dimension; |
| float* ctlpoints; |
| |
| /* |
| *in case we have to manage multiple bezierPatches. |
| */ |
| struct bezierPatch *next; |
| |
| } bezierPatch; |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension); |
| |
| bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension, int ustride, int vstride, float *ctlpoints); |
| |
| |
| bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b); |
| |
| void bezierPatchDelete(bezierPatch *b); |
| |
| void bezierPatchDeleteList(bezierPatch *b); |
| |
| void bezierPatchPrint(bezierPatch *b); |
| |
| void bezierPatchPrintList(bezierPatch *list); |
| |
| void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]); |
| |
| void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float retNormal[]); |
| |
| void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]); |
| |
| void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[]); |
| |
| |
| void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso); |
| |
| void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| |
| #endif |