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      1 /*
      2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
      3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
      4  *
      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:
     11  *
     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.
     16  *
     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
     23  * SOFTWARE.
     24  *
     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.
     29  */
     30 /*
     31 */
     32 
     33 #ifndef _BEZIERPATCH_H
     34 #define _BEZIERPATCH_H
     35 
     36 typedef struct bezierPatch{
     37   float umin, vmin, umax, vmax;
     38   int uorder; /*order= degree + 1*/
     39   int vorder;
     40 
     41   /*
     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
     46    *basis functions.
     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
     49    *array:
     50    *       ctlpoints[]
     51    *in the order of:
     52    * P[0,0], P[0,1], ..., P[0,vorder-1],
     53    * P[1,0], P[1,1], ..., P[1,vorder-1],
     54    *  ...
     55    * P[uorder-1,0], P[uorder-1,1], ..., P[uorder-1,vorder-1].
     56    */
     57   int dimension;
     58   float* ctlpoints;
     59 
     60   /*
     61    *in case we have to manage multiple bezierPatches.
     62    */
     63   struct bezierPatch  *next;
     64 
     65 } bezierPatch;
     66 
     67 #ifdef __cplusplus
     68 extern "C" {
     69 #endif
     70 
     71 bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension);
     72 
     73 bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension, int ustride, int vstride, float *ctlpoints);
     74 
     75 
     76 bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b);
     77 
     78 void bezierPatchDelete(bezierPatch *b);
     79 
     80 void bezierPatchDeleteList(bezierPatch *b);
     81 
     82 void bezierPatchPrint(bezierPatch *b);
     83 
     84 void bezierPatchPrintList(bezierPatch *list);
     85 
     86 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
     87 
     88 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float retNormal[]);
     89 
     90 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
     91 
     92 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[]);
     93 
     94 
     95 void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso);
     96 
     97 void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso);
     98 
     99 #ifdef __cplusplus
    100 }
    101 #endif
    102 
    103 
    104 #endif
    105