scene.c
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上传日期:2007-05-28
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- /* Copyright (c) Mark J. Kilgard, 1994. */
- /**
- * (c) Copyright 1993, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
- * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
- * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
- * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States. Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
- /*
- * scene.c
- * This program demonstrates the use of the GL lighting model.
- * Objects are drawn using a grey material characteristic.
- * A single light source illuminates the objects.
- */
- #include <stdlib.h>
- #include <GL/glut.h>
- /* Initialize material property and light source.
- */
- void
- myinit(void)
- {
- GLfloat light_ambient[] =
- {0.0, 0.0, 0.0, 1.0};
- GLfloat light_diffuse[] =
- {1.0, 0.0, 0.0, 1.0};
- GLfloat light_specular[] =
- {1.0, 1.0, 1.0, 1.0};
- /* light_position is NOT default value */
- GLfloat light_position[] =
- {1.0, 1.0, 1.0, 0.0};
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
- glEnable(GL_LIGHT0);
- glDepthFunc(GL_LESS);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHTING);
- }
- void
- display(void)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glPushMatrix();
- glScalef(1.3, 1.3, 1.3);
- glRotatef(20.0, 1.0, 0.0, 0.0);
- glPushMatrix();
- glTranslatef(-0.75, 0.5, 0.0);
- glRotatef(90.0, 1.0, 0.0, 0.0);
- glutSolidTorus(0.275, 0.85, 10, 15);
- glPopMatrix();
- glPushMatrix();
- glTranslatef(-0.75, -0.5, 0.0);
- glRotatef(270.0, 1.0, 0.0, 0.0);
- glutSolidTetrahedron();
- glPopMatrix();
- glPushMatrix();
- glTranslatef(0.75, 0.0, -1.0);
- glutSolidIcosahedron();
- glPopMatrix();
- glPopMatrix();
- glFlush();
- }
- void
- myReshape(int w, int h)
- {
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= h)
- glOrtho(-2.5, 2.5, -2.5 * (GLfloat) h / (GLfloat) w,
- 2.5 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
- else
- glOrtho(-2.5 * (GLfloat) w / (GLfloat) h,
- 2.5 * (GLfloat) w / (GLfloat) h, -2.5, 2.5, -10.0, 10.0);
- glMatrixMode(GL_MODELVIEW);
- }
- void
- polygon_mode(int value)
- {
- switch (value) {
- case 1:
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_LIGHTING);
- glDisable(GL_BLEND);
- glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
- break;
- case 2:
- glDisable(GL_DEPTH_TEST);
- glDisable(GL_LIGHTING);
- glColor3f(1.0, 1.0, 1.0);
- glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
- glEnable(GL_LINE_SMOOTH);
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- break;
- }
- glutPostRedisplay();
- }
- void
- main_menu(int value)
- {
- if (value == 666)
- exit(0);
- }
- /* Main Loop
- * Open window with initial window size, title bar,
- * RGBA display mode, and handle input events.
- */
- int
- main(int argc, char **argv)
- {
- int submenu;
- glutInit(&argc, argv);
- glutInitWindowPosition(500, 500);
- glutInitWindowSize(500, 500);
- glutCreateWindow(argv[0]);
- myinit();
- glutReshapeFunc(myReshape);
- glutDisplayFunc(display);
- submenu = glutCreateMenu(polygon_mode);
- glutAddMenuEntry("Filled", 1);
- glutAddMenuEntry("Outline", 2);
- glutCreateMenu(main_menu);
- glutAddMenuEntry("Quit", 666);
- glutAddSubMenu("Polygon mode", submenu);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
- }