bf4d63f6ea
methods and reimplement computeBound so that it passes back a bounding volume rather than modifying the local one.
377 lines
13 KiB
C++
377 lines
13 KiB
C++
#include <osg/Geode>
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#include <osg/TexGen>
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#include <osg/Texture2D>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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// The classic OpenGL teapot... taken form glut-3.7/lib/glut/glut_teapot.c
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/* Copyright (c) Mark J. Kilgard, 1994. */
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/**
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(c) Copyright 1993, Silicon Graphics, Inc.
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ALL RIGHTS RESERVED
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Permission to use, copy, modify, and distribute this software
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for any purpose and without fee is hereby granted, provided
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that the above copyright notice appear in all copies and that
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both the copyright notice and this permission notice appear in
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supporting documentation, and that the name of Silicon
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Graphics, Inc. not be used in advertising or publicity
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pertaining to distribution of the software without specific,
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written prior permission.
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THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU
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"AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR
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OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO
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EVENT SHALL SILICON GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE
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ELSE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR
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CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER,
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INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSS OF USE,
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SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD PARTIES, WHETHER OR
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NOT SILICON GRAPHICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY
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OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE OR
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PERFORMANCE OF THIS SOFTWARE.
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US Government Users Restricted Rights
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Use, duplication, or disclosure by the Government is subject to
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restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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(c)(1)(ii) of the Rights in Technical Data and Computer
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Software clause at DFARS 252.227-7013 and/or in similar or
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successor clauses in the FAR or the DOD or NASA FAR
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Supplement. Unpublished-- rights reserved under the copyright
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laws of the United States. Contractor/manufacturer is Silicon
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Graphics, Inc., 2011 N. Shoreline Blvd., Mountain View, CA
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94039-7311.
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OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/* Rim, body, lid, and bottom data must be reflected in x and
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y; handle and spout data across the y axis only. */
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static int patchdata[][16] =
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{
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/* rim */
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{102, 103, 104, 105, 4, 5, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15},
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/* body */
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{12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27},
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{24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36,
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37, 38, 39, 40},
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/* lid */
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{96, 96, 96, 96, 97, 98, 99, 100, 101, 101, 101,
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101, 0, 1, 2, 3,},
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{0, 1, 2, 3, 106, 107, 108, 109, 110, 111, 112,
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113, 114, 115, 116, 117},
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/* bottom */
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{118, 118, 118, 118, 124, 122, 119, 121, 123, 126,
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125, 120, 40, 39, 38, 37},
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/* handle */
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{41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
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53, 54, 55, 56},
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{53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
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28, 65, 66, 67},
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/* spout */
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{68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
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80, 81, 82, 83},
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{80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
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92, 93, 94, 95}
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};
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/* *INDENT-OFF* */
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static float cpdata[][3] =
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{
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{0.2, 0, 2.7}, {0.2, -0.112, 2.7}, {0.112, -0.2, 2.7}, {0,
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-0.2, 2.7}, {1.3375, 0, 2.53125}, {1.3375, -0.749, 2.53125},
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{0.749, -1.3375, 2.53125}, {0, -1.3375, 2.53125}, {1.4375,
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0, 2.53125}, {1.4375, -0.805, 2.53125}, {0.805, -1.4375,
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2.53125}, {0, -1.4375, 2.53125}, {1.5, 0, 2.4}, {1.5, -0.84,
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2.4}, {0.84, -1.5, 2.4}, {0, -1.5, 2.4}, {1.75, 0, 1.875},
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{1.75, -0.98, 1.875}, {0.98, -1.75, 1.875}, {0, -1.75,
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1.875}, {2, 0, 1.35}, {2, -1.12, 1.35}, {1.12, -2, 1.35},
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{0, -2, 1.35}, {2, 0, 0.9}, {2, -1.12, 0.9}, {1.12, -2,
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0.9}, {0, -2, 0.9}, {-2, 0, 0.9}, {2, 0, 0.45}, {2, -1.12,
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0.45}, {1.12, -2, 0.45}, {0, -2, 0.45}, {1.5, 0, 0.225},
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{1.5, -0.84, 0.225}, {0.84, -1.5, 0.225}, {0, -1.5, 0.225},
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{1.5, 0, 0.15}, {1.5, -0.84, 0.15}, {0.84, -1.5, 0.15}, {0,
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-1.5, 0.15}, {-1.6, 0, 2.025}, {-1.6, -0.3, 2.025}, {-1.5,
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-0.3, 2.25}, {-1.5, 0, 2.25}, {-2.3, 0, 2.025}, {-2.3, -0.3,
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2.025}, {-2.5, -0.3, 2.25}, {-2.5, 0, 2.25}, {-2.7, 0,
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2.025}, {-2.7, -0.3, 2.025}, {-3, -0.3, 2.25}, {-3, 0,
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2.25}, {-2.7, 0, 1.8}, {-2.7, -0.3, 1.8}, {-3, -0.3, 1.8},
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{-3, 0, 1.8}, {-2.7, 0, 1.575}, {-2.7, -0.3, 1.575}, {-3,
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-0.3, 1.35}, {-3, 0, 1.35}, {-2.5, 0, 1.125}, {-2.5, -0.3,
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1.125}, {-2.65, -0.3, 0.9375}, {-2.65, 0, 0.9375}, {-2,
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-0.3, 0.9}, {-1.9, -0.3, 0.6}, {-1.9, 0, 0.6}, {1.7, 0,
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1.425}, {1.7, -0.66, 1.425}, {1.7, -0.66, 0.6}, {1.7, 0,
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0.6}, {2.6, 0, 1.425}, {2.6, -0.66, 1.425}, {3.1, -0.66,
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0.825}, {3.1, 0, 0.825}, {2.3, 0, 2.1}, {2.3, -0.25, 2.1},
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{2.4, -0.25, 2.025}, {2.4, 0, 2.025}, {2.7, 0, 2.4}, {2.7,
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-0.25, 2.4}, {3.3, -0.25, 2.4}, {3.3, 0, 2.4}, {2.8, 0,
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2.475}, {2.8, -0.25, 2.475}, {3.525, -0.25, 2.49375},
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{3.525, 0, 2.49375}, {2.9, 0, 2.475}, {2.9, -0.15, 2.475},
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{3.45, -0.15, 2.5125}, {3.45, 0, 2.5125}, {2.8, 0, 2.4},
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{2.8, -0.15, 2.4}, {3.2, -0.15, 2.4}, {3.2, 0, 2.4}, {0, 0,
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3.15}, {0.8, 0, 3.15}, {0.8, -0.45, 3.15}, {0.45, -0.8,
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3.15}, {0, -0.8, 3.15}, {0, 0, 2.85}, {1.4, 0, 2.4}, {1.4,
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-0.784, 2.4}, {0.784, -1.4, 2.4}, {0, -1.4, 2.4}, {0.4, 0,
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2.55}, {0.4, -0.224, 2.55}, {0.224, -0.4, 2.55}, {0, -0.4,
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2.55}, {1.3, 0, 2.55}, {1.3, -0.728, 2.55}, {0.728, -1.3,
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2.55}, {0, -1.3, 2.55}, {1.3, 0, 2.4}, {1.3, -0.728, 2.4},
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{0.728, -1.3, 2.4}, {0, -1.3, 2.4}, {0, 0, 0}, {1.425,
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-0.798, 0}, {1.5, 0, 0.075}, {1.425, 0, 0}, {0.798, -1.425,
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0}, {0, -1.5, 0.075}, {0, -1.425, 0}, {1.5, -0.84, 0.075},
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{0.84, -1.5, 0.075}
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};
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static float tex[2][2][2] =
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{
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{ {0, 0},
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{1, 0}},
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{ {0, 1},
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{1, 1}}
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};
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/* *INDENT-ON* */
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static void
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teapot(GLint grid, GLenum type)
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{
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float p[4][4][3], q[4][4][3], r[4][4][3], s[4][4][3];
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long i, j, k, l;
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glPushAttrib(GL_ENABLE_BIT | GL_EVAL_BIT);
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glEnable(GL_AUTO_NORMAL);
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glEnable(GL_NORMALIZE);
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glEnable(GL_MAP2_VERTEX_3);
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glEnable(GL_MAP2_TEXTURE_COORD_2);
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for (i = 0; i < 10; i++) {
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for (j = 0; j < 4; j++) {
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for (k = 0; k < 4; k++) {
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for (l = 0; l < 3; l++) {
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p[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l];
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q[j][k][l] = cpdata[patchdata[i][j * 4 + (3 - k)]][l];
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if (l == 1)
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q[j][k][l] *= -1.0;
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if (i < 6) {
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r[j][k][l] =
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cpdata[patchdata[i][j * 4 + (3 - k)]][l];
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if (l == 0)
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r[j][k][l] *= -1.0;
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s[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l];
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if (l == 0)
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s[j][k][l] *= -1.0;
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if (l == 1)
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s[j][k][l] *= -1.0;
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}
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}
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}
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}
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glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 0, 1, 4, 2,
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&tex[0][0][0]);
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
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&p[0][0][0]);
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glMapGrid2f(grid, 0.0, 1.0, grid, 0.0, 1.0);
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glEvalMesh2(type, 0, grid, 0, grid);
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
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&q[0][0][0]);
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glEvalMesh2(type, 0, grid, 0, grid);
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if (i < 6) {
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
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&r[0][0][0]);
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glEvalMesh2(type, 0, grid, 0, grid);
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glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4,
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&s[0][0][0]);
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glEvalMesh2(type, 0, grid, 0, grid);
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}
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}
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glPopAttrib();
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}
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// Now the OSG wrapper for the above OpenGL code, the most complicated bit is computing
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// the bounding box for the above example, normally you'll find this the easy bit.
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class Teapot : public osg::Drawable
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{
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public:
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Teapot() {}
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Teapot(const Teapot& teapot,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Drawable(teapot,copyop) {}
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META_Object(myTeapotApp,Teapot)
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// the draw immediate mode method is where the OSG wraps up the drawing of
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// of OpenGL primitives.
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virtual void drawImplementation(osg::State&) const
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{
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// teapot(..) doens't use vertex arrays at all so we don't need to toggle their state
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// if we did we'd need to something like following call
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// state.disableAllVertexArrays(), see src/osg/Geometry.cpp for the low down.
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// just call the OpenGL code.
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teapot(14,GL_FILL);
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}
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// we need to set up the bounding box of the data too, so that the scene graph knows where this
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// objects is, for both positioning the camera at start up, and most importantly for culling.
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virtual osg::BoundingBox computeBound() const
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{
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osg::BoundingBox bbox;
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// follow is some truely horrible code required to calculate the
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// bounding box of the teapot. Have used the original code above to do
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// help compute it.
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float p[4][4][3], q[4][4][3], r[4][4][3], s[4][4][3];
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long i, j, k, l;
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for (i = 0; i < 10; i++) {
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for (j = 0; j < 4; j++) {
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for (k = 0; k < 4; k++) {
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for (l = 0; l < 3; l++) {
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p[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l];
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q[j][k][l] = cpdata[patchdata[i][j * 4 + (3 - k)]][l];
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if (l == 1)
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q[j][k][l] *= -1.0;
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if (i < 6) {
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r[j][k][l] =
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cpdata[patchdata[i][j * 4 + (3 - k)]][l];
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if (l == 0)
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r[j][k][l] *= -1.0;
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s[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l];
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if (l == 0)
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s[j][k][l] *= -1.0;
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if (l == 1)
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s[j][k][l] *= -1.0;
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}
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}
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bbox.expandBy(osg::Vec3(p[j][k][0],p[j][k][1],p[j][k][2]));
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bbox.expandBy(osg::Vec3(q[j][k][0],q[j][k][1],q[j][k][2]));
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if (i < 6)
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{
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bbox.expandBy(osg::Vec3(r[j][k][0],r[j][k][1],r[j][k][2]));
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bbox.expandBy(osg::Vec3(s[j][k][0],s[j][k][1],s[j][k][2]));
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}
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}
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}
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}
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return bbox;
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}
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protected:
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virtual ~Teapot() {}
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};
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osg::Geode* createTeapot()
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{
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osg::Geode* geode = new osg::Geode();
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// add the teapot to the geode.
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geode->addDrawable( new Teapot );
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// add a reflection map to the teapot.
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osg::Image* image = osgDB::readImageFile("Images/reflect.rgb");
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if (image)
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{
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setImage(image);
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osg::TexGen* texgen = new osg::TexGen;
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texgen->setMode(osg::TexGen::SPHERE_MAP);
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osg::StateSet* stateset = new osg::StateSet;
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stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
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stateset->setTextureAttributeAndModes(0,texgen,osg::StateAttribute::ON);
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geode->setStateSet(stateset);
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}
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return geode;
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}
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates how to encpsulate OpenGL rendering code via sublcassing of osg::Drawable..");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occured when parsing the program aguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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// add model to viewer.
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viewer.setSceneData( createTeapot() );
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// create the windows and run the threads.
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viewer.realize();
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete before exit.
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viewer.sync();
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return 0;
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}
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