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Diffstat (limited to 'progs/redbook/multitex.c')
| -rw-r--r-- | progs/redbook/multitex.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/progs/redbook/multitex.c b/progs/redbook/multitex.c new file mode 100644 index 0000000000..060db3b176 --- /dev/null +++ b/progs/redbook/multitex.c @@ -0,0 +1,175 @@ +/* + * Copyright (c) 1993-2003, 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 Unpublished - rights + * reserved under the copyright laws of the United States.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. + * 1500 Crittenden Lane + * Mountain View, CA 94043 + * United State of America + * + * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. + */ + +/* multitex.c + */ +#include <GL/glut.h> +#include <stdlib.h> +#include <stdio.h> + + +static GLubyte texels0[32][32][4]; +static GLubyte texels1[16][16][4]; + +static void makeCheckImages(void) +{ + int i, j; + + for (i = 0; i < 32; i++) { + for (j = 0; j < 32; j++) { + texels0[i][j][0] = (GLubyte) (255 * i / 31); + texels0[i][j][1] = (GLubyte) (255 * j / 31); + texels0[i][j][2] = (GLubyte) (i*j)/255; + texels0[i][j][3] = (GLubyte) 255; + } + } + + for (i = 0; i < 16; i++) { + for (j = 0; j < 16; j++) { + texels1[i][j][0] = (GLubyte) 255; + texels1[i][j][1] = (GLubyte) (255 * i / 15); + texels1[i][j][2] = (GLubyte) (255 * j / 15); + texels1[i][j][3] = (GLubyte) 255; + } + } +} + +static void init(void) +{ + GLuint texNames[2]; + + glClearColor (0.0, 0.0, 0.0, 0.0); + glShadeModel(GL_FLAT); + glEnable(GL_DEPTH_TEST); + + makeCheckImages(); + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + + glGenTextures(2, texNames); + glBindTexture(GL_TEXTURE_2D, texNames[0]); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 32, 32, 0, GL_RGBA, + GL_UNSIGNED_BYTE, texels0); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, + GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, + GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + + glBindTexture(GL_TEXTURE_2D, texNames[1]); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, + GL_UNSIGNED_BYTE, texels1); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + /* Use the two texture objects to define two texture units + * for use in multitexturing */ + glActiveTextureARB (GL_TEXTURE0_ARB); + glEnable(GL_TEXTURE_2D); + glBindTexture(GL_TEXTURE_2D, texNames[0]); + glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + glMatrixMode (GL_TEXTURE); + glLoadIdentity(); + glTranslatef(0.5f, 0.5f, 0.0f); + glRotatef(45.0f, 0.0f, 0.0f, 1.0f); + glTranslatef(-0.5f, -0.5f, 0.0f); + glMatrixMode (GL_MODELVIEW); + glActiveTextureARB (GL_TEXTURE1_ARB); + glEnable(GL_TEXTURE_2D); + glBindTexture(GL_TEXTURE_2D, texNames[1]); + glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); +} + +static void display(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glBegin(GL_TRIANGLES); + glMultiTexCoord2fARB (GL_TEXTURE0_ARB, 0.0, 0.0); + glMultiTexCoord2fARB (GL_TEXTURE1_ARB, 1.0, 0.0); + glVertex2f(0.0, 0.0); + glMultiTexCoord2fARB (GL_TEXTURE0_ARB, 0.5, 1.0); + glMultiTexCoord2fARB (GL_TEXTURE1_ARB, 0.5, 0.0); + glVertex2f(50.0, 100.0); + glMultiTexCoord2fARB (GL_TEXTURE0_ARB, 1.0, 0.0); + glMultiTexCoord2fARB (GL_TEXTURE1_ARB, 1.0, 1.0); + glVertex2f(100.0, 0.0); + glEnd(); + glFlush(); +} + +static void reshape(int w, int h) +{ + glViewport(0, 0, (GLsizei) w, (GLsizei) h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + if (w <= h) + gluOrtho2D(0.0, 100.0, 0.0, 100.0 * (GLdouble)h/(GLdouble)w); + else + gluOrtho2D(0.0, 100.0 * (GLdouble)w/(GLdouble)h, 0.0, 100.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +static 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; +} |