1 files changed, 148 insertions, 0 deletions
diff --git a/progs/redbook/movelight.c b/progs/redbook/movelight.c
new file mode 100644
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+++ b/progs/redbook/movelight.c
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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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*
+ *  movelight.c
+ *  This program demonstrates when to issue lighting and
+ *  transformation commands to render a model with a light
+ *  which is moved by a modeling transformation (rotate or
+ *  translate).  The light position is reset after the modeling
+ *  transformation is called.  The eye position does not change.
+ *
+ *  A sphere is drawn using a grey material characteristic.
+ *  A single light source illuminates the object.
+ *
+ *  Interaction:  pressing the left mouse button alters
+ *  the modeling transformation (x rotation) by 30 degrees.
+ *  The scene is then redrawn with the light in a new position.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+
+static int spin = 0;
+
+/*  Initialize material property, light source, lighting model,
+ *  and depth buffer.
+ */
+void init(void) 
+{
+   glClearColor (0.0, 0.0, 0.0, 0.0);
+   glShadeModel (GL_SMOOTH);
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glEnable(GL_DEPTH_TEST);
+}
+
+/*  Here is where the light position is reset after the modeling
+ *  transformation (glRotated) is called.  This places the
+ *  light at a new position in world coordinates.  The cube
+ *  represents the position of the light.
+ */
+void display(void)
+{
+   GLfloat position[] = { 0.0, 0.0, 1.5, 1.0 };
+
+   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+   glPushMatrix ();
+   gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
+
+   glPushMatrix ();
+   glRotated ((GLdouble) spin, 1.0, 0.0, 0.0);
+   glLightfv (GL_LIGHT0, GL_POSITION, position);
+
+   glTranslated (0.0, 0.0, 1.5);
+   glDisable (GL_LIGHTING);
+   glColor3f (0.0, 1.0, 1.0);
+   glutWireCube (0.1);
+   glEnable (GL_LIGHTING);
+   glPopMatrix ();
+
+   glutSolidTorus (0.275, 0.85, 8, 15);
+   glPopMatrix ();
+   glFlush ();
+}
+
+void reshape (int w, int h)
+{
+   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode (GL_PROJECTION);
+   glLoadIdentity();
+   gluPerspective(40.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
+   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) {
+            spin = (spin + 30) % 360;
+            glutPostRedisplay();
+         }
+         break;
+      default:
+         break;
+   }
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 27:
+         exit(0);
+         break;
+   }
+}
+
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
+   glutInitWindowSize (500, 500); 
+   glutInitWindowPosition (100, 100);
+   glutCreateWindow (argv[0]);
+   init ();
+   glutDisplayFunc(display); 
+   glutReshapeFunc(reshape);
+   glutMouseFunc(mouse);
+   glutKeyboardFunc(keyboard);
+   glutMainLoop();
+   return 0;
+}