bezierPatch.h

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
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 */
/*
*/

#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