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| 55 | pj | 1 | /* $Id: tess.h,v 1.1 2003-02-28 11:42:08 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 3.3 |
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| 6 | * Copyright (C) 1995-2000 Brian Paul |
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| 7 | * |
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| 8 | * This library is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Library General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * This library is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Library General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Library General Public |
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| 19 | * License along with this library; if not, write to the Free |
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| 20 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 21 | */ |
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| 22 | |||
| 23 | |||
| 24 | /* |
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| 25 | * This file is part of the polygon tesselation code contributed by |
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| 26 | * Bogdan Sikorski |
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| 27 | */ |
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| 28 | |||
| 29 | |||
| 30 | #ifndef TESS_H |
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| 31 | #define TESS_H |
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| 32 | |||
| 33 | |||
| 34 | #include "gluP.h" |
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| 35 | |||
| 36 | #define EPSILON 1e-06 /* epsilon for double precision compares */ |
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| 37 | |||
| 38 | typedef enum |
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| 39 | { |
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| 40 | OXY, |
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| 41 | OYZ, |
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| 42 | OXZ |
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| 43 | } |
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| 44 | projection_type; |
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| 45 | |||
| 46 | typedef struct callbacks_str |
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| 47 | { |
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| 48 | void (GLCALLBACK * begin) (GLenum mode); |
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| 49 | void (GLCALLBACK * edgeFlag) (GLboolean flag); |
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| 50 | void (GLCALLBACK * vertex) (GLvoid * v); |
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| 51 | void (GLCALLBACK * end) (void); |
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| 52 | void (GLCALLBACK * error) (GLenum err); |
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| 53 | } |
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| 54 | tess_callbacks; |
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| 55 | |||
| 56 | typedef struct vertex_str |
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| 57 | { |
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| 58 | void *data; |
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| 59 | GLdouble location[3]; |
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| 60 | GLdouble x, y; |
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| 61 | GLboolean edge_flag; |
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| 62 | struct vertex_str *shadow_vertex; |
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| 63 | struct vertex_str *next, *previous; |
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| 64 | } |
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| 65 | tess_vertex; |
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| 66 | |||
| 67 | typedef struct contour_str |
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| 68 | { |
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| 69 | GLenum type; |
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| 70 | GLuint vertex_cnt; |
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| 71 | GLdouble area; |
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| 72 | GLenum orientation; |
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| 73 | struct vertex_str *vertices, *last_vertex; |
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| 74 | struct contour_str *next, *previous; |
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| 75 | } |
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| 76 | tess_contour; |
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| 77 | |||
| 78 | typedef struct polygon_str |
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| 79 | { |
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| 80 | GLuint vertex_cnt; |
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| 81 | GLdouble A, B, C, D; |
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| 82 | GLdouble area; |
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| 83 | GLenum orientation; |
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| 84 | struct vertex_str *vertices, *last_vertex; |
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| 85 | } |
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| 86 | tess_polygon; |
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| 87 | |||
| 88 | struct GLUtesselator |
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| 89 | { |
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| 90 | tess_contour *contours, *last_contour; |
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| 91 | GLuint contour_cnt; |
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| 92 | tess_callbacks callbacks; |
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| 93 | tess_polygon *current_polygon; |
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| 94 | GLenum error; |
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| 95 | GLdouble A, B, C, D; |
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| 96 | projection_type projection; |
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| 97 | }; |
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| 98 | |||
| 99 | |||
| 100 | extern void tess_call_user_error(GLUtriangulatorObj *, GLenum); |
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| 101 | extern void tess_test_polygon(GLUtriangulatorObj *); |
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| 102 | extern void tess_find_contour_hierarchies(GLUtriangulatorObj *); |
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| 103 | extern void tess_handle_holes(GLUtriangulatorObj *); |
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| 104 | extern void tess_tesselate(GLUtriangulatorObj *); |
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| 105 | extern void tess_tesselate_with_edge_flag(GLUtriangulatorObj *); |
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| 106 | |||
| 107 | |||
| 108 | #endif |