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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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/* image.c
+ * This program demonstrates drawing pixels and shows the effect
+ * of glDrawPixels(), glCopyPixels(), and glPixelZoom().
+ * Interaction: moving the mouse while pressing the mouse button
+ * will copy the image in the lower-left corner of the window
+ * to the mouse position, using the current pixel zoom factors.
+ * There is no attempt to prevent you from drawing over the original
+ * image. If you press the 'r' key, the original image and zoom
+ * factors are reset. If you press the 'z' or 'Z' keys, you change
+ * the zoom factors.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+/* Create checkerboard image */
+#define checkImageWidth 64
+#define checkImageHeight 64
+GLubyte checkImage[checkImageHeight][checkImageWidth][3];
+
+static GLdouble zoomFactor = 1.0;
+static GLint height;
+
+void makeCheckImage(void)
+{
+ int i, j, c;
+
+ for (i = 0; i < checkImageHeight; i++) {
+ for (j = 0; j < checkImageWidth; j++) {
+ c = (((i&0x8)==0)^((j&0x8)==0))*255;
+ checkImage[i][j][0] = (GLubyte) c;
+ checkImage[i][j][1] = (GLubyte) c;
+ checkImage[i][j][2] = (GLubyte) c;
+ }
+ }
+}
+
+void init(void)
+{
+ glClearColor (0.0, 0.0, 0.0, 0.0);
+ glShadeModel(GL_FLAT);
+ makeCheckImage();
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+}
+
+void display(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT);
+ glRasterPos2i(0, 0);
+ glDrawPixels(checkImageWidth, checkImageHeight, GL_RGB,
+ GL_UNSIGNED_BYTE, checkImage);
+ glFlush();
+}
+
+void reshape(int w, int h)
+{
+ glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+ height = (GLint) h;
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluOrtho2D(0.0, (GLdouble) w, 0.0, (GLdouble) h);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+void motion(int x, int y)
+{
+ static GLint screeny;
+
+ screeny = height - (GLint) y;
+ glRasterPos2i (x, screeny);
+ glPixelZoom (zoomFactor, zoomFactor);
+ glCopyPixels (0, 0, checkImageWidth, checkImageHeight, GL_COLOR);
+ glPixelZoom (1.0, 1.0);
+ glFlush ();
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+ switch (key) {
+ case 'r':
+ case 'R':
+ zoomFactor = 1.0;
+ glutPostRedisplay();
+ printf ("zoomFactor reset to 1.0\n");
+ break;
+ case 'z':
+ zoomFactor += 0.5;
+ if (zoomFactor >= 3.0)
+ zoomFactor = 3.0;
+ printf ("zoomFactor is now %4.1f\n", zoomFactor);
+ break;
+ case 'Z':
+ zoomFactor -= 0.5;
+ if (zoomFactor <= 0.5)
+ zoomFactor = 0.5;
+ printf ("zoomFactor is now %4.1f\n", zoomFactor);
+ break;
+ case 27:
+ exit(0);
+ break;
+ default:
+ break;
+ }
+}
+
+int main(int argc, char** argv)
+{
+ glutInit(&argc, argv);
+ glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+ glutInitWindowSize(250, 250);
+ glutInitWindowPosition(100, 100);
+ glutCreateWindow(argv[0]);
+ init();
+ glutDisplayFunc(display);
+ glutReshapeFunc(reshape);
+ glutKeyboardFunc(keyboard);
+ glutMotionFunc(motion);
+ glutMainLoop();
+ return 0;
+}