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Diffstat (limited to 'progs/redbook/mipmap.c')
| -rw-r--r-- | progs/redbook/mipmap.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/progs/redbook/mipmap.c b/progs/redbook/mipmap.c new file mode 100644 index 00000000000..96ef394f60e --- /dev/null +++ b/progs/redbook/mipmap.c @@ -0,0 +1,165 @@ + +/* Copyright (c) Mark J. Kilgard, 1994. */ + +/* + * (c) Copyright 1993, 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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(TM) is a trademark of Silicon Graphics, Inc. + */ +/* mipmap.c + * This program demonstrates using mipmaps for texture maps. + * To overtly show the effect of mipmaps, each mipmap reduction + * level has a solidly colored, contrasting texture image. + * Thus, the quadrilateral which is drawn is drawn with several + * different colors. + */ +#include <stdlib.h> +#include <GL/glut.h> + +GLubyte mipmapImage32[32][32][3]; +GLubyte mipmapImage16[16][16][3]; +GLubyte mipmapImage8[8][8][3]; +GLubyte mipmapImage4[4][4][3]; +GLubyte mipmapImage2[2][2][3]; +GLubyte mipmapImage1[1][1][3]; + +void makeImages(void) +{ + int i, j; + + for (i = 0; i < 32; i++) { + for (j = 0; j < 32; j++) { + mipmapImage32[i][j][0] = 255; + mipmapImage32[i][j][1] = 255; + mipmapImage32[i][j][2] = 0; + } + } + for (i = 0; i < 16; i++) { + for (j = 0; j < 16; j++) { + mipmapImage16[i][j][0] = 255; + mipmapImage16[i][j][1] = 0; + mipmapImage16[i][j][2] = 255; + } + } + for (i = 0; i < 8; i++) { + for (j = 0; j < 8; j++) { + mipmapImage8[i][j][0] = 255; + mipmapImage8[i][j][1] = 0; + mipmapImage8[i][j][2] = 0; + } + } + for (i = 0; i < 4; i++) { + for (j = 0; j < 4; j++) { + mipmapImage4[i][j][0] = 0; + mipmapImage4[i][j][1] = 255; + mipmapImage4[i][j][2] = 0; + } + } + for (i = 0; i < 2; i++) { + for (j = 0; j < 2; j++) { + mipmapImage2[i][j][0] = 0; + mipmapImage2[i][j][1] = 0; + mipmapImage2[i][j][2] = 255; + } + } + mipmapImage1[0][0][0] = 255; + mipmapImage1[0][0][1] = 255; + mipmapImage1[0][0][2] = 255; +} + +void myinit(void) +{ + glEnable(GL_DEPTH_TEST); + glDepthFunc(GL_LESS); + glShadeModel(GL_FLAT); + + glTranslatef(0.0, 0.0, -3.6); + makeImages(); + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + glTexImage2D(GL_TEXTURE_2D, 0, 3, 32, 32, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]); + glTexImage2D(GL_TEXTURE_2D, 1, 3, 16, 16, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]); + glTexImage2D(GL_TEXTURE_2D, 2, 3, 8, 8, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]); + glTexImage2D(GL_TEXTURE_2D, 3, 3, 4, 4, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]); + glTexImage2D(GL_TEXTURE_2D, 4, 3, 2, 2, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]); + glTexImage2D(GL_TEXTURE_2D, 5, 3, 1, 1, 0, + GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, + GL_NEAREST_MIPMAP_NEAREST); + glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); + glEnable(GL_TEXTURE_2D); +} + +void display(void) +{ + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glBegin(GL_QUADS); + glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); + glTexCoord2f(0.0, 8.0); glVertex3f(-2.0, 1.0, 0.0); + glTexCoord2f(8.0, 8.0); glVertex3f(2000.0, 1.0, -6000.0); + glTexCoord2f(8.0, 0.0); glVertex3f(2000.0, -1.0, -6000.0); + glEnd(); + glFlush(); +} + +void myReshape(int w, int h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutInitWindowSize (500, 500); + glutCreateWindow (argv[0]); + myinit(); + glutReshapeFunc (myReshape); + glutDisplayFunc(display); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} + |