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/* Test GL_TEXTURE_BASE_LEVEL and GL_TEXTURE_MAX_LEVEL
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/* Copyright (c) Mark J. Kilgard, 1994. */
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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static GLfloat LodBias = 6.0; /* make smallest miplevel visible */
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static GLuint texImage;
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LodBias = 6.0; /* make smallest miplevel visible */
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static void MakeImage(void)
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const GLubyte color0[4] = { 0xff, 0x80, 0x20, 0xff };
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const GLubyte color1[4] = { 0x10, 0x20, 0x40, 0xff };
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GLubyte img[WIDTH*HEIGHT*3];
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for (i = 0; i < HEIGHT; i++) {
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for (j = 0; j < WIDTH; j++) {
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int k = (i * WIDTH + j) * 3;
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img[k + 0] = color0[0];
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img[k + 1] = color0[1];
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img[k + 2] = color0[2];
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img[k + 0] = color1[0];
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img[k + 1] = color1[1];
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img[k + 2] = color1[2];
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glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WIDTH, HEIGHT, 0,
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GL_RGB, GL_UNSIGNED_BYTE, img);
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glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
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static void myinit(void)
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glShadeModel(GL_FLAT);
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glTranslatef(0.0, 0.0, -3.6);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glGenTextures(1, &texImage);
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glBindTexture(GL_TEXTURE_2D, texImage);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glEnable(GL_TEXTURE_2D);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, -1);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, 1);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_NEAREST_MIPMAP_NEAREST);
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static void display(void)
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glBindTexture(GL_TEXTURE_2D, texImage);
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printf("Bias=%.2g\n", LodBias);
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glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
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glClear(GL_COLOR_BUFFER_BIT);
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glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
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glTexCoord2f(0.0, tcm); glVertex3f(-2.0, 1.0, 0.0);
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glTexCoord2f(tcm * 3000.0, tcm); glVertex3f(3000.0, 1.0, -6000.0);
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glTexCoord2f(tcm * 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
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static void myReshape(int w, int h)
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0);
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glMatrixMode(GL_MODELVIEW);
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key(unsigned char k, int x, int y)
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case 27: /* Escape */
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static void usage(void)
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printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
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printf(" SPACE reset values\n");
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int main(int argc, char** argv)
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glutInit(&argc, argv);
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glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB );
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glutInitWindowSize (600, 600);
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glutCreateWindow (argv[0]);
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glutReshapeFunc (myReshape);
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glutDisplayFunc(display);
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glutKeyboardFunc(key);
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return 0; /* ANSI C requires main to return int. */
added
removed
src/tests/mipgen.c
