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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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* Test compressed texture mipmaps
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* Based on mipmap_limits
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#define SIZE 16 /* not larger then 16 */
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static GLint BaseLevel = 0, MaxLevel = 9;
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static GLfloat MinLod = -1, MaxLod = 9;
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static GLfloat LodBias = 0.0;
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static GLboolean NearestFilter = GL_TRUE;
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static GLuint texImage;
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NearestFilter = GL_TRUE;
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makeImage(int level, int width, int height)
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GLubyte img[SIZE*SIZE*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] = 255 * ((level + 1) % 2);
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img[k + 1] = 255 * ((level + 1) % 2);
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img[k + 2] = 255 * ((level + 1) % 2);
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glTexImage2D(GL_TEXTURE_2D, level, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, width, height, 0,
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GL_RGB, GL_UNSIGNED_BYTE, img);
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int value = ((level + 1) % 2) * 0xffffffff;
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/* generate black and white mipmap levels */
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for (i = 0; i < size[level] / 4; i += 2)
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((int*)img)[i] = value;
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glCompressedTexImage2D(GL_TEXTURE_2D, level,
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GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
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for (i = 0, sz = SIZE; sz >= 1; i++, sz /= 2) {
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makeImage(i, sz, sz);
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printf("Level %d size: %d x %d\n", i, sz, sz);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LESS);
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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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glBindTexture(GL_TEXTURE_2D, texImage);
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printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n",
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BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
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NearestFilter ? "NEAREST" : "LINEAR");
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
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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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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_LINEAR_MIPMAP_LINEAR);
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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 | GL_DEPTH_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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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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NearestFilter = !NearestFilter;
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case 27: /* Escape */
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printf(" b/B decrease/increase GL_TEXTURE_BASE_LEVEL\n");
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printf(" m/M decrease/increase GL_TEXTURE_MAX_LEVEL\n");
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printf(" n/N decrease/increase GL_TEXTURE_MIN_LOD\n");
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printf(" x/X decrease/increase GL_TEXTURE_MAX_LOD\n");
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printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
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printf(" f toggle nearest/linear filtering\n");
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printf(" SPACE reset values\n");
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main(int argc, char** argv)
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glutInit(&argc, argv);
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glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
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glutInitWindowSize (600, 600);
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glutCreateWindow (argv[0]);
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if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
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fprintf(stderr, "This test requires GL_EXT_texture_compression_s3tc.\n");
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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/mipmap_comp.c
