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Amiga Magazin: Amiga-CD 2000 April & May
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AMIGA_2000_04.iso
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patches
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mesa3.1
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book.aux
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mipmap.c
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C/C++ Source or Header
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1999-06-25
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168 lines
/*
* (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* Unpublished-- rights reserved under the copyright laws of the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 <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
#include <GL/glaux.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)
{
auxInitDisplayMode(AUX_SINGLE | AUX_RGB | AUX_DEPTH);
auxInitPosition(0, 0, 500, 500);
if (!auxInitWindow(argv[0]))
auxQuit();
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
return 0;
}