OpenGLUT 0.6.3 development - OpenGLUT: texbind.c File Reference
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# texbind.c File Reference

## Detailed Description

This program demonstrates using glBindTexture() by creating and managing two textures.

    /*
     * 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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

    #include <GL/openglut.h>
    #include <stdlib.h>
    #include <stdio.h>

    #ifdef GL_VERSION_1_1
    /*  Create checkerboard texture */
    #define checkImageWidth 64
    #define checkImageHeight 64
    static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
    static GLubyte otherImage[checkImageHeight][checkImageWidth][4];

    static GLuint texName[2];

    void makeCheckImages(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;
             checkImage[i][j][3] = (GLubyte) 255;
             c = ((((i&0x10)==0)^((j&0x10)==0)))*255;
             otherImage[i][j][0] = (GLubyte) c;
             otherImage[i][j][1] = (GLubyte) 0;
             otherImage[i][j][2] = (GLubyte) 0;
             otherImage[i][j][3] = (GLubyte) 255;
          }
       }
    }

    void init(void)
    {
       glClearColor (0.0, 0.0, 0.0, 0.0);
       glShadeModel(GL_FLAT);
       glEnable(GL_DEPTH_TEST);

       makeCheckImages();
       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

       glGenTextures(2, texName);
       glBindTexture(GL_TEXTURE_2D, texName[0]);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
                       GL_NEAREST);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                       GL_NEAREST);
       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
                    checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                    checkImage);

       glBindTexture(GL_TEXTURE_2D, texName[1]);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
                    checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                    otherImage);
       glEnable(GL_TEXTURE_2D);
    }

    void display(void)
    {
       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
       glBindTexture(GL_TEXTURE_2D, texName[0]);
       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);
       glEnd();
       glBindTexture(GL_TEXTURE_2D, texName[1]);
       glBegin(GL_QUADS);
       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();
       glFlush();
    }

    void reshape(int w, int h)
    {
       glViewport(0, 0, (GLsizei) w, (GLsizei) h);
       glMatrixMode(GL_PROJECTION);
       glLoadIdentity();
       gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
       glMatrixMode(GL_MODELVIEW);
       glLoadIdentity();
       glTranslatef(0.0, 0.0, -3.6);
    }

    /* 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(250, 250);
       glutInitWindowPosition(100, 100);
       glutCreateWindow(argv[0]);
       init();
       glutReshapeFunc(reshape);
       glutDisplayFunc(display);
       glutKeyboardFunc (keyboard);
       glutMainLoop();
       return 0;
    }
    #else
    int main(int argc, char** argv)
    {
        fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
        fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
        fprintf (stderr, "you may be able to modify this program to make it run.\n");
        return 0;
    }
    #endif

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