Initial revision

1 files changed, 125 insertions, 0 deletions

diff --git a/progs/redbook/checker.c b/progs/redbook/checker.c
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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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+/*  checker.c
+ *  This program texture maps a checkerboard image onto
+ *  two rectangles.  This program clamps the texture, if
+ *  the texture coordinates fall outside 0.0 and 1.0.
+ */
+#include <GL/glut.h>
+
+/*	Create checkerboard texture	*/
+#define	checkImageWidth 64
+#define	checkImageHeight 64
+GLubyte checkImage[checkImageWidth][checkImageHeight][3];
+
+void makeCheckImage(void)
+{
+    int i, j, c;
+    
+    for (i = 0; i < checkImageWidth; i++) {
+	for (j = 0; j < checkImageHeight; 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 myinit(void)
+{    
+    glClearColor (0.0, 0.0, 0.0, 0.0);
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LESS);
+
+    makeCheckImage();
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glTexImage2D(GL_TEXTURE_2D, 0, 3, checkImageWidth, 
+	checkImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, 
+	&checkImage[0][0][0]);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+    glEnable(GL_TEXTURE_2D);
+    glShadeModel(GL_FLAT);
+}
+
+void display(void)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glBegin(GL_QUADS);
+    glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
+    glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0);
+    glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0);
+    glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0);
+
+    glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0);
+    glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0);
+    glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421);
+    glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421);
+    glEnd();
+    glutSwapBuffers();
+}
+
+void myReshape(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0.0, 0.0, -3.6);
+}
+
+int
+main(int argc, char** argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
+    glutCreateWindow("checker");
+    myinit();
+    glutReshapeFunc (myReshape);
+    glutDisplayFunc(display);
+    glutMainLoop();
+    return 0;             /* ANSI C requires main to return int. */
+}