texbind.c revision 32001f49 
1/*
2 * Copyright (c) 1993-1997, Silicon Graphics, Inc.
3 * ALL RIGHTS RESERVED
4 * Permission to use, copy, modify, and distribute this software for
5 * any purpose and without fee is hereby granted, provided that the above
6 * copyright notice appear in all copies and that both the copyright notice
7 * and this permission notice appear in supporting documentation, and that
8 * the name of Silicon Graphics, Inc. not be used in advertising
9 * or publicity pertaining to distribution of the software without specific,
10 * written prior permission.
11 *
12 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
13 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
14 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
15 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
16 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
17 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
18 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
19 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
20 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
21 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
23 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
24 *
25 * US Government Users Restricted Rights
26 * Use, duplication, or disclosure by the Government is subject to
27 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
28 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
29 * clause at DFARS 252.227-7013 and/or in similar or successor
30 * clauses in the FAR or the DOD or NASA FAR Supplement.
31 * Unpublished-- rights reserved under the copyright laws of the
32 * United States.  Contractor/manufacturer is Silicon Graphics,
33 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
34 *
35 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
36 */
37
38/*  texbind.c
39 *  This program demonstrates using glBindTexture() by
40 *  creating and managing two textures.
41 */
42#include "glut_wrap.h"
43#include <stdlib.h>
44#include <stdio.h>
45
46#ifdef GL_VERSION_1_1
47/*	Create checkerboard texture	*/
48#define	checkImageWidth 64
49#define	checkImageHeight 64
50static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
51static GLubyte otherImage[checkImageHeight][checkImageWidth][4];
52
53static GLuint texName[2];
54
55static void makeCheckImages(void)
56{
57   int i, j, c;
58
59   for (i = 0; i < checkImageHeight; i++) {
60      for (j = 0; j < checkImageWidth; j++) {
61         c = ((((i&0x8)==0)^((j&0x8)==0)))*255;
62         checkImage[i][j][0] = (GLubyte) c;
63         checkImage[i][j][1] = (GLubyte) c;
64         checkImage[i][j][2] = (GLubyte) c;
65         checkImage[i][j][3] = (GLubyte) 255;
66         c = ((((i&0x10)==0)^((j&0x10)==0)))*255;
67         otherImage[i][j][0] = (GLubyte) c;
68         otherImage[i][j][1] = (GLubyte) 0;
69         otherImage[i][j][2] = (GLubyte) 0;
70         otherImage[i][j][3] = (GLubyte) 255;
71      }
72   }
73}
74
75static void init(void)
76{
77   glClearColor (0.0, 0.0, 0.0, 0.0);
78   glShadeModel(GL_FLAT);
79   glEnable(GL_DEPTH_TEST);
80
81   makeCheckImages();
82   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
83
84   glGenTextures(2, texName);
85   glBindTexture(GL_TEXTURE_2D, texName[0]);
86   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
87   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
88   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
89                   GL_NEAREST);
90   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
91                   GL_NEAREST);
92   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
93                checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
94                checkImage);
95
96   glBindTexture(GL_TEXTURE_2D, texName[1]);
97   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
98   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
99   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
100   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
101   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
102   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
103                checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
104                otherImage);
105   glEnable(GL_TEXTURE_2D);
106}
107
108static void display(void)
109{
110   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
111   glBindTexture(GL_TEXTURE_2D, texName[0]);
112   glBegin(GL_QUADS);
113   glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
114   glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0);
115   glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0);
116   glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0);
117   glEnd();
118   glBindTexture(GL_TEXTURE_2D, texName[1]);
119   glBegin(GL_QUADS);
120   glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0);
121   glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0);
122   glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421);
123   glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421);
124   glEnd();
125   glFlush();
126}
127
128static void reshape(int w, int h)
129{
130   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
131   glMatrixMode(GL_PROJECTION);
132   glLoadIdentity();
133   gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
134   glMatrixMode(GL_MODELVIEW);
135   glLoadIdentity();
136   glTranslatef(0.0, 0.0, -3.6);
137}
138
139/* ARGSUSED1 */
140static void keyboard(unsigned char key, int x, int y)
141{
142   switch (key) {
143      case 27:
144         exit(0);
145         break;
146   }
147}
148
149int main(int argc, char** argv)
150{
151   glutInit(&argc, argv);
152   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
153   glutInitWindowSize(250, 250);
154   glutInitWindowPosition(100, 100);
155   glutCreateWindow(argv[0]);
156   init();
157   glutReshapeFunc(reshape);
158   glutDisplayFunc(display);
159   glutKeyboardFunc (keyboard);
160   glutMainLoop();
161   return 0;
162}
163#else
164int main(int argc, char** argv)
165{
166    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
167    fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
168    fprintf (stderr, "you may be able to modify this program to make it run.\n");
169    return 0;
170}
171#endif
172