FreeWRL / FreeX3D 4.3.0
bezierPatch.h
1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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29 */
30/*
31*/
32
33#ifndef _BEZIERPATCH_H
34#define _BEZIERPATCH_H
35
36typedef 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
66
67#ifdef __cplusplus
68extern "C" {
69#endif
70
71bezierPatch* bezierPatchMake(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension);
72
73bezierPatch* bezierPatchMake2(float umin, float vmin, float umax, float vmax, int urder, int vorder, int dimension, int ustride, int vstride, float *ctlpoints);
74
75
76bezierPatch* bezierPatchInsert(bezierPatch *list, bezierPatch *b);
77
78void bezierPatchDelete(bezierPatch *b);
79
80void bezierPatchDeleteList(bezierPatch *b);
81
82void bezierPatchPrint(bezierPatch *b);
83
84void bezierPatchPrintList(bezierPatch *list);
85
86void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
87
88void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float retNormal[]);
89
90void bezierPatchEval(bezierPatch *b, float u, float v, float ret[]);
91
92void bezierPatchEvalNormal(bezierPatch *b, float u, float v, float ret[]);
93
94
95void bezierPatchDraw(bezierPatch *bpatch, int u_reso, int v_reso);
96
97void bezierPatchListDraw(bezierPatch *list, int u_reso, int v_reso);
98
99#ifdef __cplusplus
100}
101#endif
102
103
104#endif