www.pudn.com > openglbk.rar > texture3d.c

/* 
 * Copyright (c) 1993-1999, 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 * Unpublished-- rights reserved under the copyright laws of the 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. 
 */ 
 
/*  texture3d.c 
 *  This program demonstrates using a three-dimensional texture. 
 *  It creates a 3D texture and then renders two rectangles 
 *  with different texture coordinates to obtain different 
 *  "slices" of the 3D texture. 
 */ 
#include  
#include  
#include  
 
#ifdef GL_VERSION_1_2 
#define	iWidth 16 
#define	iHeight 16 
#define iDepth 16 
 
static GLubyte image[iDepth][iHeight][iWidth][3]; 
static GLuint texName; 
 
/*  Create a 16x16x16x3 array with different color values in 
 *  each array element [r, g, b].  Values range from 0 to 255. 
 */ 
 
void makeImage(void) 
{ 
   int s, t, r; 
     
   for (s = 0; s < 16; s++) 
      for (t = 0; t < 16; t++) 
         for (r = 0; r < 16; r++) { 
            image[r][t][s][0] = (GLubyte) (s * 17); 
            image[r][t][s][1] = (GLubyte) (t * 17); 
            image[r][t][s][2] = (GLubyte) (r * 17); 
         } 
} 
 
void init(void) 
{     
   glClearColor (0.0, 0.0, 0.0, 0.0); 
   glShadeModel(GL_FLAT); 
   glEnable(GL_DEPTH_TEST); 
 
   makeImage(); 
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
 
   glGenTextures(1, &texName); 
   glBindTexture(GL_TEXTURE_3D, texName); 
   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP); 
   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP); 
   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP); 
   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER,  
                   GL_NEAREST); 
   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER,  
                   GL_NEAREST); 
   glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, iWidth, iHeight, 
                iDepth, 0, GL_RGB, GL_UNSIGNED_BYTE, image); 
   glEnable(GL_TEXTURE_3D); 
} 
 
void display(void) 
{ 
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
   glBegin(GL_QUADS); 
   glTexCoord3f(0.0, 0.0, 0.0); glVertex3f(-2.25, -1.0, 0.0); 
   glTexCoord3f(0.0, 1.0, 0.0); glVertex3f(-2.25, 1.0, 0.0); 
   glTexCoord3f(1.0, 1.0, 1.0); glVertex3f(-0.25, 1.0, 0.0); 
   glTexCoord3f(1.0, 0.0, 1.0); glVertex3f(-0.25, -1.0, 0.0); 
 
   glTexCoord3f(0.0, 0.0, 1.0); glVertex3f(0.25, -1.0, 0.0); 
   glTexCoord3f(0.0, 1.0, 1.0); glVertex3f(0.25, 1.0, 0.0); 
   glTexCoord3f(1.0, 1.0, 0.0); glVertex3f(2.25, 1.0, 0.0); 
   glTexCoord3f(1.0, 0.0, 0.0); glVertex3f(2.25, -1.0, 0.0); 
   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, -4.0); 
} 
 
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 or 1.1.\n"); 
    fprintf (stderr, "If your implementation of OpenGL has the right extensions,\n"); 
    fprintf (stderr, "you may be able to modify this program to make it run.\n"); 
    return 0; 
} 
#endif