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+/*
+ * Copyright (c) 1993-1997, 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+ * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ * double.c
+ * This is a simple double buffered program.
+ * Pressing the left mouse button rotates the rectangle.
+ * Pressing the middle mouse button stops the rotation.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+
+static GLfloat spin = 0.0;
+static GLdouble t0 = 0.;
+
+void display(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT);
+ glPushMatrix();
+ glRotatef(spin, 0.0, 0.0, 1.0);
+ glColor3f(1.0, 1.0, 1.0);
+ glRectf(-25.0, -25.0, 25.0, 25.0);
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+GLdouble gettime(void)
+{
+ return (GLdouble)(glutGet(GLUT_ELAPSED_TIME)) / 1000.;
+}
+
+void spinDisplay(void)
+{
+ GLdouble t, dt;
+ t = gettime();
+ dt = t - t0;
+ t0 = t;
+ spin = spin + 120.0*dt;
+ if (spin > 360.0)
+ spin = spin - 360.0;
+ glutPostRedisplay();
+}
+
+void init(void)
+{
+ glClearColor (0.0, 0.0, 0.0, 0.0);
+ glShadeModel (GL_FLAT);
+}
+
+void reshape(int w, int h)
+{
+ glViewport (0, 0, (GLsizei) w, (GLsizei) h);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+/* ARGSUSED2 */
+void mouse(int button, int state, int x, int y)
+{
+ switch (button) {
+ case GLUT_LEFT_BUTTON:
+ if (state == GLUT_DOWN)
+ {
+ t0 = gettime();
+ glutIdleFunc(spinDisplay);
+ }
+ break;
+ case GLUT_MIDDLE_BUTTON:
+ if (state == GLUT_DOWN)
+ glutIdleFunc(NULL);
+ break;
+ default:
+ break;
+ }
+}
+
+static void
+key(unsigned char k, int x, int y)
+{
+ switch (k) {
+ case 27: /* Escape */
+ exit(0);
+ break;
+ default:
+ return;
+ }
+ glutPostRedisplay();
+}
+
+/*
+ * Request double buffer display mode.
+ * Register mouse input callback functions
+ */
+int main(int argc, char** argv)
+{
+ glutInit(&argc, argv);
+ glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
+ glutInitWindowSize (250, 250);
+ glutInitWindowPosition (100, 100);
+ glutCreateWindow (argv[0]);
+ init ();
+ glutDisplayFunc(display);
+ glutReshapeFunc(reshape);
+ glutMouseFunc(mouse);
+ glutKeyboardFunc(key);
+ glutMainLoop();
+ return 0; /* ANSI C requires main to return int. */
+}