300 lines
7.8 KiB
C
300 lines
7.8 KiB
C
/* 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* Unpublished-- rights reserved under the copyright laws of the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_comp
|
|
* Test compressed texture mipmaps
|
|
*
|
|
* Based on mipmap_limits
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <GL/glew.h>
|
|
#include <GL/glut.h>
|
|
|
|
#define SIZE 16 /* not larger then 16 */
|
|
|
|
static GLint BaseLevel = 0, MaxLevel = 9;
|
|
static GLfloat MinLod = -1, MaxLod = 9;
|
|
static GLfloat LodBias = 0.0;
|
|
static GLboolean NearestFilter = GL_TRUE;
|
|
static GLuint texImage;
|
|
|
|
|
|
static void
|
|
initValues(void)
|
|
{
|
|
BaseLevel = 0;
|
|
MaxLevel = 9;
|
|
MinLod = -1;
|
|
MaxLod = 2;
|
|
LodBias = 5.0;
|
|
NearestFilter = GL_TRUE;
|
|
}
|
|
|
|
|
|
static void
|
|
makeImage(int level, int width, int height)
|
|
{
|
|
#if 0
|
|
GLubyte img[SIZE*SIZE*3];
|
|
int i, j;
|
|
|
|
(void)size;
|
|
for (i = 0; i < height; i++) {
|
|
for (j = 0; j < width; j++) {
|
|
int k = (i * width + j) * 3;
|
|
img[k + 0] = 255 * ((level + 1) % 2);
|
|
img[k + 1] = 255 * ((level + 1) % 2);
|
|
img[k + 2] = 255 * ((level + 1) % 2);
|
|
}
|
|
}
|
|
|
|
glTexImage2D(GL_TEXTURE_2D, level, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, width, height, 0,
|
|
GL_RGB, GL_UNSIGNED_BYTE, img);
|
|
#else
|
|
GLubyte img[128];
|
|
GLint size[] = {
|
|
128, /* 16x16 */
|
|
32, /* 8x8 */
|
|
8, /* 4x4 */
|
|
8, /* 2x2 */
|
|
8, /* 1x1 */
|
|
};
|
|
int i;
|
|
int value = ((level + 1) % 2) * 0xffffffff;
|
|
memset(img, 0, 128);
|
|
|
|
/* generate black and white mipmap levels */
|
|
if (value)
|
|
for (i = 0; i < size[level] / 4; i += 2)
|
|
((int*)img)[i] = value;
|
|
|
|
glCompressedTexImage2D(GL_TEXTURE_2D, level,
|
|
GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
|
|
width, height, 0,
|
|
size[level], img);
|
|
#endif
|
|
}
|
|
|
|
|
|
static void
|
|
makeImages(void)
|
|
{
|
|
int i, sz;
|
|
|
|
for (i = 0, sz = SIZE; sz >= 1; i++, sz /= 2) {
|
|
makeImage(i, sz, sz);
|
|
printf("Level %d size: %d x %d\n", i, sz, sz);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
myInit(void)
|
|
{
|
|
|
|
initValues();
|
|
|
|
glEnable(GL_DEPTH_TEST);
|
|
glDepthFunc(GL_LESS);
|
|
glShadeModel(GL_FLAT);
|
|
|
|
glTranslatef(0.0, 0.0, -3.6);
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glGenTextures(1, &texImage);
|
|
glBindTexture(GL_TEXTURE_2D, texImage);
|
|
makeImages();
|
|
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
|
|
glEnable(GL_TEXTURE_2D);
|
|
}
|
|
|
|
|
|
static void
|
|
display(void)
|
|
{
|
|
GLfloat tcm = 1.0;
|
|
glBindTexture(GL_TEXTURE_2D, texImage);
|
|
|
|
printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n",
|
|
BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
|
|
NearestFilter ? "NEAREST" : "LINEAR");
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
|
|
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
|
|
|
|
if (NearestFilter) {
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
|
|
GL_NEAREST_MIPMAP_NEAREST);
|
|
}
|
|
else {
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
|
|
GL_LINEAR_MIPMAP_LINEAR);
|
|
}
|
|
|
|
glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
|
|
|
|
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, tcm); glVertex3f(-2.0, 1.0, 0.0);
|
|
glTexCoord2f(tcm * 3000.0, tcm); glVertex3f(3000.0, 1.0, -6000.0);
|
|
glTexCoord2f(tcm * 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
|
|
glEnd();
|
|
glFlush();
|
|
}
|
|
|
|
|
|
static 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();
|
|
}
|
|
|
|
|
|
static void
|
|
key(unsigned char k, int x, int y)
|
|
{
|
|
(void) x;
|
|
(void) y;
|
|
switch (k) {
|
|
case 'b':
|
|
BaseLevel--;
|
|
if (BaseLevel < 0)
|
|
BaseLevel = 0;
|
|
break;
|
|
case 'B':
|
|
BaseLevel++;
|
|
if (BaseLevel > 10)
|
|
BaseLevel = 10;
|
|
break;
|
|
case 'm':
|
|
MaxLevel--;
|
|
if (MaxLevel < 0)
|
|
MaxLevel = 0;
|
|
break;
|
|
case 'M':
|
|
MaxLevel++;
|
|
if (MaxLevel > 10)
|
|
MaxLevel = 10;
|
|
break;
|
|
case 'l':
|
|
LodBias -= 0.25;
|
|
break;
|
|
case 'L':
|
|
LodBias += 0.25;
|
|
break;
|
|
case 'n':
|
|
MinLod -= 0.25;
|
|
break;
|
|
case 'N':
|
|
MinLod += 0.25;
|
|
break;
|
|
case 'x':
|
|
MaxLod -= 0.25;
|
|
break;
|
|
case 'X':
|
|
MaxLod += 0.25;
|
|
break;
|
|
case 'f':
|
|
NearestFilter = !NearestFilter;
|
|
break;
|
|
case ' ':
|
|
initValues();
|
|
break;
|
|
case 27: /* Escape */
|
|
exit(0);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
printf("usage:\n");
|
|
printf(" b/B decrease/increase GL_TEXTURE_BASE_LEVEL\n");
|
|
printf(" m/M decrease/increase GL_TEXTURE_MAX_LEVEL\n");
|
|
printf(" n/N decrease/increase GL_TEXTURE_MIN_LOD\n");
|
|
printf(" x/X decrease/increase GL_TEXTURE_MAX_LOD\n");
|
|
printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
|
|
printf(" f toggle nearest/linear filtering\n");
|
|
printf(" SPACE reset values\n");
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char** argv)
|
|
{
|
|
glutInit(&argc, argv);
|
|
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
|
|
glutInitWindowSize (600, 600);
|
|
glutCreateWindow (argv[0]);
|
|
glewInit();
|
|
|
|
if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
|
|
fprintf(stderr, "This test requires GL_EXT_texture_compression_s3tc.\n");
|
|
exit(1);
|
|
}
|
|
|
|
myInit();
|
|
glutReshapeFunc (myReshape);
|
|
glutDisplayFunc(display);
|
|
glutKeyboardFunc(key);
|
|
usage();
|
|
glutMainLoop();
|
|
return 0; /* ANSI C requires main to return int. */
|
|
}
|