src/glu/sgi/libnurbs/interface/bezierPatch.h

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 **
  34 ** $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
  35 */
  36 /*
  37 ** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/interface/bezierPatch.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
  38 */
  39
  40 #ifndef _BEZIERPATCH_H
  41 #define _BEZIERPATCH_H
  42
  43 typedef struct bezierPatch{
  44   float umin, vmin, umax, vmax;
  45   int uorder; /*order= degree + 1*/
  46   int vorder;
  47
  48   /*
  49    *the control points are stored in a one dimensional  array.
  50    *the surface is defined as:
  51    *      s(u,v) = sum_{i,j} P(i,j) * B_i(u) * B_j(v).
  52    *where P(i,j) are the control points, B_i(.) are Bezier
  53    *basis functions.
  54    *Each control point can have dimension 3 or 4: (x,y,z,w).
  55    *The components of P(i,j) are stored in a one dimensional
  56    *array:
  57    *       ctlpoints[]
  58    *in the order of:
  59    * P[0,0], P[0,1], ..., P[0,vorder-1],
  60    * P[1,0], P[1,1], ..., P[1,vorder-1],
  61    *  ...
  62    * P[uorder-1,0], P[uorder-1,1], ..., P[uorder-1,vorder-1].
  63    */
  64   int dimension;
  65   float* ctlpoints;
  66
  67   /*
  68    *in case we have to manage multiple bezierPatches.
  69    */
  70   struct bezierPatch  *next;
  71
  72 } bezierPatch;
  73
  74 #ifdef __cplusplus
  75 extern "C" {
  76 #endif
  77
  78 bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension);
  79
  80 bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension, int ustride, int vstride, float *ctlpoints);
  81
  82
  83 bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b);
  84
  85 void bezierPatchDelete(bezierPatch *b);
  86
  87 void bezierPatchDeleteList(bezierPatch *b);
  88
  89 void bezierPatchPrint(bezierPatch *b);
  90
  91 void bezierPatchPrintList(bezierPatch *list);
  92
  93 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
  94
  95 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float retNormal[]);
  96
  97 void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
  98
  99 void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[]);
 100
 101
 102 void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso);
 103
 104 void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso);
 105
 106 #ifdef __cplusplus
 107 }
 108 #endif
 109
 110
 111 #endif