1/*
2 * Copyright (c) 1993-2003, Silicon Graphics, Inc.
3 * All Rights Reserved
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose and without fee is hereby granted, provided that the above
7 * copyright notice appear in all copies and that both the copyright
8 * notice and this permission notice appear in supporting documentation,
9 * and that the name of Silicon Graphics, Inc. not be used in
10 * advertising or publicity pertaining to distribution of the software
11 * without specific, written prior permission.
12 *
13 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND
14 * WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
16 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
17 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
18 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF
20 * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD
21 * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN ADVISED OF
22 * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE
24 * OR PERFORMANCE OF THIS SOFTWARE.
25 *
26 * US Government Users Restricted Rights
27 * Use, duplication, or disclosure by the Government is subject to
28 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
29 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
30 * clause at DFARS 252.227-7013 and/or in similar or successor clauses
31 * in the FAR or the DOD or NASA FAR Supplement.  Unpublished - rights
32 * reserved under the copyright laws of the United States.
33 *
34 * Contractor/manufacturer is:
35 *	Silicon Graphics, Inc.
36 *	1500 Crittenden Lane
37 *	Mountain View, CA  94043
38 *	United State of America
39 *
40 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
41 */
42
43/*  texture3d.c
44 *  This program demonstrates using a three-dimensional texture.
45 *  It creates a 3D texture and then renders two rectangles
46 *  with different texture coordinates to obtain different
47 *  "slices" of the 3D texture.
48 */
49#include <GL/glew.h>
50#include "glut_wrap.h"
51#include <stdlib.h>
52#include <stdio.h>
53
54#ifdef GL_VERSION_1_2
55#define	iWidth 16
56#define	iHeight 16
57#define iDepth 16
58
59static GLubyte image[iDepth][iHeight][iWidth][3];
60static GLuint texName;
61
62/*  Create a 16x16x16x3 array with different color values in
63 *  each array element [r, g, b].  Values range from 0 to 255.
64 */
65
66static void makeImage(void)
67{
68   int s, t, r;
69
70   for (s = 0; s < 16; s++)
71      for (t = 0; t < 16; t++)
72         for (r = 0; r < 16; r++) {
73            image[r][t][s][0] = (GLubyte) (s * 17);
74            image[r][t][s][1] = (GLubyte) (t * 17);
75            image[r][t][s][2] = (GLubyte) (r * 17);
76         }
77}
78
79static void init(void)
80{
81   glClearColor (0.0, 0.0, 0.0, 0.0);
82   glShadeModel(GL_FLAT);
83   glEnable(GL_DEPTH_TEST);
84
85   makeImage();
86   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
87
88   glGenTextures(1, &texName);
89   glBindTexture(GL_TEXTURE_3D, texName);
90   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP);
91   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP);
92   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP);
93   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER,
94                   GL_NEAREST);
95   glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER,
96                   GL_NEAREST);
97   glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, iWidth, iHeight,
98                iDepth, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
99   glEnable(GL_TEXTURE_3D);
100}
101
102static void display(void)
103{
104   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
105   glBegin(GL_QUADS);
106   glTexCoord3f(0.0, 0.0, 0.0); glVertex3f(-2.25, -1.0, 0.0);
107   glTexCoord3f(0.0, 1.0, 0.0); glVertex3f(-2.25, 1.0, 0.0);
108   glTexCoord3f(1.0, 1.0, 1.0); glVertex3f(-0.25, 1.0, 0.0);
109   glTexCoord3f(1.0, 0.0, 1.0); glVertex3f(-0.25, -1.0, 0.0);
110
111   glTexCoord3f(0.0, 0.0, 1.0); glVertex3f(0.25, -1.0, 0.0);
112   glTexCoord3f(0.0, 1.0, 1.0); glVertex3f(0.25, 1.0, 0.0);
113   glTexCoord3f(1.0, 1.0, 0.0); glVertex3f(2.25, 1.0, 0.0);
114   glTexCoord3f(1.0, 0.0, 0.0); glVertex3f(2.25, -1.0, 0.0);
115   glEnd();
116   glFlush();
117}
118
119static void reshape(int w, int h)
120{
121   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
122   glMatrixMode(GL_PROJECTION);
123   glLoadIdentity();
124   gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
125   glMatrixMode(GL_MODELVIEW);
126   glLoadIdentity();
127   glTranslatef(0.0, 0.0, -4.0);
128}
129
130static void keyboard(unsigned char key, int x, int y)
131{
132   switch (key) {
133      case 27:
134         exit(0);
135         break;
136   }
137}
138
139int main(int argc, char** argv)
140{
141   glutInit(&argc, argv);
142   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
143   glutInitWindowSize(250, 250);
144   glutInitWindowPosition(100, 100);
145   glutCreateWindow(argv[0]);
146   glewInit();
147   init();
148   glutReshapeFunc(reshape);
149   glutDisplayFunc(display);
150   glutKeyboardFunc (keyboard);
151   glutMainLoop();
152   return 0;
153}
154#else
155int main(int argc, char** argv)
156{
157    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0 or 1.1.\n");
158    fprintf (stderr, "If your implementation of OpenGL has the right extensions,\n");
159    fprintf (stderr, "you may be able to modify this program to make it run.\n");
160    return 0;
161}
162#endif
163
164