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/*
* 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.
*/
/*
*/
#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
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