jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 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| 31 | * Unpublished-- rights reserved under the copyright laws of the |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 | /* wrap.c |
| 39 | * This program texture maps a checkerboard image onto |
| 40 | * two rectangles. This program demonstrates the wrapping |
| 41 | * modes, if the texture coordinates fall outside 0.0 and 1.0. |
| 42 | * Interaction: Pressing the 's' and 'S' keys switch the |
| 43 | * wrapping between clamping and repeating for the s parameter. |
| 44 | * The 't' and 'T' keys control the wrapping for the t parameter. |
| 45 | * |
| 46 | * If running this program on OpenGL 1.0, texture objects are |
| 47 | * not used. |
| 48 | */ |
| 49 | #include <GL/glut.h> |
| 50 | #include <stdlib.h> |
| 51 | #include <stdio.h> |
| 52 | |
| 53 | /* Create checkerboard texture */ |
| 54 | #define checkImageWidth 64 |
| 55 | #define checkImageHeight 64 |
| 56 | static GLubyte checkImage[checkImageHeight][checkImageWidth][4]; |
| 57 | |
| 58 | #ifdef GL_VERSION_1_1 |
| 59 | static GLuint texName; |
| 60 | #endif |
| 61 | |
| 62 | void makeCheckImage(void) |
| 63 | { |
| 64 | int i, j, c; |
| 65 | |
| 66 | for (i = 0; i < checkImageHeight; i++) { |
| 67 | for (j = 0; j < checkImageWidth; j++) { |
Brian Paul | db6aa58 | 2000-11-10 17:23:02 +0000 | [diff] [blame] | 68 | c = (((i&0x8)==0)^((j&0x8)==0))*255; |
jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 69 | checkImage[i][j][0] = (GLubyte) c; |
| 70 | checkImage[i][j][1] = (GLubyte) c; |
| 71 | checkImage[i][j][2] = (GLubyte) c; |
| 72 | checkImage[i][j][3] = (GLubyte) 255; |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | void init(void) |
| 78 | { |
| 79 | glClearColor (0.0, 0.0, 0.0, 0.0); |
| 80 | glShadeModel(GL_FLAT); |
| 81 | glEnable(GL_DEPTH_TEST); |
| 82 | |
| 83 | makeCheckImage(); |
| 84 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| 85 | |
| 86 | #ifdef GL_VERSION_1_1 |
| 87 | glGenTextures(1, &texName); |
| 88 | glBindTexture(GL_TEXTURE_2D, texName); |
| 89 | #endif |
| 90 | |
| 91 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); |
| 92 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); |
| 93 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| 94 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| 95 | #ifdef GL_VERSION_1_1 |
| 96 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, |
| 97 | 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage); |
| 98 | #else |
| 99 | glTexImage2D(GL_TEXTURE_2D, 0, 4, checkImageWidth, checkImageHeight, |
| 100 | 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage); |
| 101 | #endif |
| 102 | } |
| 103 | |
| 104 | void display(void) |
| 105 | { |
| 106 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 107 | glEnable(GL_TEXTURE_2D); |
| 108 | glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); |
| 109 | #ifdef GL_VERSION_1_1 |
| 110 | glBindTexture(GL_TEXTURE_2D, texName); |
| 111 | #endif |
| 112 | |
| 113 | glBegin(GL_QUADS); |
| 114 | glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); |
| 115 | glTexCoord2f(0.0, 3.0); glVertex3f(-2.0, 1.0, 0.0); |
| 116 | glTexCoord2f(3.0, 3.0); glVertex3f(0.0, 1.0, 0.0); |
| 117 | glTexCoord2f(3.0, 0.0); glVertex3f(0.0, -1.0, 0.0); |
| 118 | |
| 119 | glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0); |
| 120 | glTexCoord2f(0.0, 3.0); glVertex3f(1.0, 1.0, 0.0); |
| 121 | glTexCoord2f(3.0, 3.0); glVertex3f(2.41421, 1.0, -1.41421); |
| 122 | glTexCoord2f(3.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421); |
| 123 | glEnd(); |
| 124 | glFlush(); |
| 125 | glDisable(GL_TEXTURE_2D); |
| 126 | } |
| 127 | |
| 128 | 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 */ |
| 140 | void keyboard (unsigned char key, int x, int y) |
| 141 | { |
| 142 | switch (key) { |
| 143 | case 's': |
| 144 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); |
| 145 | glutPostRedisplay(); |
| 146 | break; |
| 147 | case 'S': |
| 148 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); |
| 149 | glutPostRedisplay(); |
| 150 | break; |
| 151 | case 't': |
| 152 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); |
| 153 | glutPostRedisplay(); |
| 154 | break; |
| 155 | case 'T': |
| 156 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); |
| 157 | glutPostRedisplay(); |
| 158 | break; |
| 159 | case 27: |
| 160 | exit(0); |
| 161 | break; |
| 162 | default: |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | int main(int argc, char** argv) |
| 168 | { |
| 169 | glutInit(&argc, argv); |
| 170 | glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); |
| 171 | glutInitWindowSize(250, 250); |
| 172 | glutInitWindowPosition(100, 100); |
| 173 | glutCreateWindow(argv[0]); |
| 174 | init(); |
| 175 | glutDisplayFunc(display); |
| 176 | glutReshapeFunc(reshape); |
| 177 | glutKeyboardFunc(keyboard); |
| 178 | glutMainLoop(); |
| 179 | return 0; |
| 180 | } |