147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
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* Copyright (c) 1993-1997, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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 Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* double.c
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* This is a simple double buffered program.
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* Pressing the left mouse button rotates the rectangle.
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* Pressing the middle mouse button stops the rotation.
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*/
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#include <GL/glut.h>
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#include <stdlib.h>
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static GLfloat spin = 0.0;
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static GLdouble t0 = 0.;
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glRotatef(spin, 0.0, 0.0, 1.0);
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glColor3f(1.0, 1.0, 1.0);
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glRectf(-25.0, -25.0, 25.0, 25.0);
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glPopMatrix();
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glutSwapBuffers();
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}
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GLdouble gettime(void)
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{
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return (GLdouble)(glutGet(GLUT_ELAPSED_TIME)) / 1000.;
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}
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void spinDisplay(void)
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{
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GLdouble t, dt;
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t = gettime();
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dt = t - t0;
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t0 = t;
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spin = spin + 120.0*dt;
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if (spin > 360.0)
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spin = spin - 360.0;
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glutPostRedisplay();
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}
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void init(void)
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{
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glClearColor (0.0, 0.0, 0.0, 0.0);
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glShadeModel (GL_FLAT);
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}
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void reshape(int w, int h)
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{
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glViewport (0, 0, (GLsizei) w, (GLsizei) h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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/* ARGSUSED2 */
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void mouse(int button, int state, int x, int y)
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{
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switch (button) {
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case GLUT_LEFT_BUTTON:
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if (state == GLUT_DOWN)
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{
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t0 = gettime();
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glutIdleFunc(spinDisplay);
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}
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break;
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case GLUT_MIDDLE_BUTTON:
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if (state == GLUT_DOWN)
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glutIdleFunc(NULL);
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break;
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default:
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break;
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}
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}
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static void
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key(unsigned char k, int x, int y)
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{
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switch (k) {
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case 27: /* Escape */
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exit(0);
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break;
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default:
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return;
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}
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glutPostRedisplay();
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}
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/*
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* Request double buffer display mode.
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* Register mouse input callback functions
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*/
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int main(int argc, char** argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
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glutInitWindowSize (250, 250);
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glutInitWindowPosition (100, 100);
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glutCreateWindow (argv[0]);
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init ();
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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glutMouseFunc(mouse);
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glutKeyboardFunc(key);
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glutMainLoop();
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return 0; /* ANSI C requires main to return int. */
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}
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