1 /* Copyright (c) Mark J. Kilgard, 1994. */
3 * (c) Copyright 1993, Silicon Graphics, Inc.
5 * Permission to use, copy, modify, and distribute this software for
6 * any purpose and without fee is hereby granted, provided that the above
7 * copyright notice appear in all copies and that both the copyright notice
8 * and this permission notice appear in supporting documentation, and that
9 * the name of Silicon Graphics, Inc. not be used in advertising
10 * or publicity pertaining to distribution of the software without specific,
11 * written prior permission.
13 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
14 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
16 * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
17 * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
18 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
19 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
20 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
21 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
22 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
23 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
24 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
26 * US Government Users Restricted Rights
27 * Use, duplication, or disclosure by the Government is subject to
28 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
29 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
30 * clause at DFARS 252.227-7013 and/or in similar or successor
31 * clauses in the FAR or the DOD or NASA FAR Supplement.
32 * Unpublished-- rights reserved under the copyright laws of the
33 * United States. Contractor/manufacturer is Silicon Graphics,
34 * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
36 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
40 * Test compressed texture mipmaps
42 * Based on mipmap_limits
53 #define SIZE 16 /* not larger then 16 */
55 static GLint BaseLevel
= 0, MaxLevel
= 9;
56 static GLfloat MinLod
= -1, MaxLod
= 9;
57 static GLfloat LodBias
= 0.0;
58 static GLboolean NearestFilter
= GL_TRUE
;
59 static GLuint texImage
;
70 NearestFilter
= GL_TRUE
;
75 makeImage(int level
, int width
, int height
)
78 GLubyte img
[SIZE
*SIZE
*3];
82 for (i
= 0; i
< height
; i
++) {
83 for (j
= 0; j
< width
; j
++) {
84 int k
= (i
* width
+ j
) * 3;
85 img
[k
+ 0] = 255 * ((level
+ 1) % 2);
86 img
[k
+ 1] = 255 * ((level
+ 1) % 2);
87 img
[k
+ 2] = 255 * ((level
+ 1) % 2);
91 glTexImage2D(GL_TEXTURE_2D
, level
, GL_COMPRESSED_RGB_S3TC_DXT1_EXT
, width
, height
, 0,
92 GL_RGB
, GL_UNSIGNED_BYTE
, img
);
103 int value
= ((level
+ 1) % 2) * 0xffffffff;
106 /* generate black and white mipmap levels */
108 for (i
= 0; i
< size
[level
] / 4; i
+= 2)
109 ((int*)img
)[i
] = value
;
111 glCompressedTexImage2D(GL_TEXTURE_2D
, level
,
112 GL_COMPRESSED_RGB_S3TC_DXT1_EXT
,
124 for (i
= 0, sz
= SIZE
; sz
>= 1; i
++, sz
/= 2) {
125 makeImage(i
, sz
, sz
);
126 printf("Level %d size: %d x %d\n", i
, sz
, sz
);
137 glEnable(GL_DEPTH_TEST
);
138 glDepthFunc(GL_LESS
);
139 glShadeModel(GL_FLAT
);
141 glTranslatef(0.0, 0.0, -3.6);
143 glPixelStorei(GL_UNPACK_ALIGNMENT
, 1);
144 glGenTextures(1, &texImage
);
145 glBindTexture(GL_TEXTURE_2D
, texImage
);
148 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_WRAP_S
, GL_REPEAT
);
149 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_WRAP_T
, GL_REPEAT
);
150 glTexEnvf(GL_TEXTURE_ENV
, GL_TEXTURE_ENV_MODE
, GL_DECAL
);
151 glEnable(GL_TEXTURE_2D
);
159 glBindTexture(GL_TEXTURE_2D
, texImage
);
161 printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n",
162 BaseLevel
, MaxLevel
, MinLod
, MaxLod
, LodBias
,
163 NearestFilter
? "NEAREST" : "LINEAR");
164 glTexParameteri(GL_TEXTURE_2D
, GL_TEXTURE_BASE_LEVEL
, BaseLevel
);
165 glTexParameteri(GL_TEXTURE_2D
, GL_TEXTURE_MAX_LEVEL
, MaxLevel
);
167 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MIN_LOD
, MinLod
);
168 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MAX_LOD
, MaxLod
);
171 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MAG_FILTER
, GL_NEAREST
);
172 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MIN_FILTER
,
173 GL_NEAREST_MIPMAP_NEAREST
);
176 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MAG_FILTER
, GL_LINEAR
);
177 glTexParameterf(GL_TEXTURE_2D
, GL_TEXTURE_MIN_FILTER
,
178 GL_LINEAR_MIPMAP_LINEAR
);
181 glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT
, GL_TEXTURE_LOD_BIAS_EXT
, LodBias
);
183 glClear(GL_COLOR_BUFFER_BIT
| GL_DEPTH_BUFFER_BIT
);
185 glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
186 glTexCoord2f(0.0, tcm
); glVertex3f(-2.0, 1.0, 0.0);
187 glTexCoord2f(tcm
* 3000.0, tcm
); glVertex3f(3000.0, 1.0, -6000.0);
188 glTexCoord2f(tcm
* 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
195 myReshape(int w
, int h
)
197 glViewport(0, 0, w
, h
);
198 glMatrixMode(GL_PROJECTION
);
200 gluPerspective(60.0, 1.0*(GLfloat
)w
/(GLfloat
)h
, 1.0, 30000.0);
201 glMatrixMode(GL_MODELVIEW
);
207 key(unsigned char k
, int x
, int y
)
251 NearestFilter
= !NearestFilter
;
256 case 27: /* Escape */
270 printf(" b/B decrease/increase GL_TEXTURE_BASE_LEVEL\n");
271 printf(" m/M decrease/increase GL_TEXTURE_MAX_LEVEL\n");
272 printf(" n/N decrease/increase GL_TEXTURE_MIN_LOD\n");
273 printf(" x/X decrease/increase GL_TEXTURE_MAX_LOD\n");
274 printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
275 printf(" f toggle nearest/linear filtering\n");
276 printf(" SPACE reset values\n");
281 main(int argc
, char** argv
)
283 glutInit(&argc
, argv
);
284 glutInitDisplayMode (GLUT_SINGLE
| GLUT_RGB
| GLUT_DEPTH
);
285 glutInitWindowSize (600, 600);
286 glutCreateWindow (argv
[0]);
289 glutReshapeFunc (myReshape
);
290 glutDisplayFunc(display
);
291 glutKeyboardFunc(key
);
294 return 0; /* ANSI C requires main to return int. */