progs/tests/mipmap_limits.c

   1 /* Test GL_TEXTURE_BASE_LEVEL and GL_TEXTURE_MAX_LEVEL
   2  * Brian Paul
   3  * 10 May 2006
   4  */
   5
   6
   7 /* Copyright (c) Mark J. Kilgard, 1994. */
   8
   9 /*
  10  * (c) Copyright 1993, Silicon Graphics, Inc.
  11  * ALL RIGHTS RESERVED
  12  * Permission to use, copy, modify, and distribute this software for
  13  * any purpose and without fee is hereby granted, provided that the above
  14  * copyright notice appear in all copies and that both the copyright notice
  15  * and this permission notice appear in supporting documentation, and that
  16  * the name of Silicon Graphics, Inc. not be used in advertising
  17  * or publicity pertaining to distribution of the software without specific,
  18  * written prior permission.
  19  *
  20  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  21  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  22  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  23  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  24  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  25  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  26  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  27  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  28  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  29  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  30  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  31  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  32  *
  33  * US Government Users Restricted Rights
  34  * Use, duplication, or disclosure by the Government is subject to
  35  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  36  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  37  * clause at DFARS 252.227-7013 and/or in similar or successor
  38  * clauses in the FAR or the DOD or NASA FAR Supplement.
  39  * Unpublished-- rights reserved under the copyright laws of the
  40  * United States.  Contractor/manufacturer is Silicon Graphics,
  41  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  42  *
  43  * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
  44  */
  45 /*  mipmap.c
  46  *  This program demonstrates using mipmaps for texture maps.
  47  *  To overtly show the effect of mipmaps, each mipmap reduction
  48  *  level has a solidly colored, contrasting texture image.
  49  *  Thus, the quadrilateral which is drawn is drawn with several
  50  *  different colors.
  51  */
  52 #include <stdlib.h>
  53 #include <stdio.h>
  54 #include <GL/glew.h>
  55 #include <GL/glut.h>
  56
  57 #include "readtex.h"
  58
  59 #define TEXTURE_FILE "../images/girl.rgb"
  60
  61 static GLint BaseLevel = 0, MaxLevel = 9;
  62 static GLfloat MinLod = -1, MaxLod = 9;
  63 static GLfloat LodBias = 0.0;
  64 static GLboolean NearestFilter = GL_TRUE;
  65 static GLuint texImage, texColor, texCurrent;
  66
  67
  68 static void
  69 InitValues(void)
  70 {
  71    BaseLevel = 0;
  72    MaxLevel = 9;
  73    MinLod = -1;
  74    MaxLod = 9;
  75    LodBias = 0.0;
  76    NearestFilter = GL_TRUE;
  77 }
  78
  79
  80 static void
  81 MakeImage(int level, int width, int height, const GLubyte color[4])
  82 {
  83    const int makeStripes = 0;
  84    GLubyte img[512 * 512 * 3];
  85    int i, j;
  86    for (i = 0; i < height; i++) {
  87       for (j = 0; j < width; j++) {
  88          int k = (i * width + j) * 3;
  89          int p = (i / 8) & makeStripes;
  90          if (p == 0) {
  91             img[k + 0] = color[0];
  92             img[k + 1] = color[1];
  93             img[k + 2] = color[2];
  94          }
  95          else {
  96             img[k + 0] = 0;
  97             img[k + 1] = 0;
  98             img[k + 2] = 0;
  99          }
 100       }
 101    }
 102
 103    glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, width, height, 0,
 104                 GL_RGB, GL_UNSIGNED_BYTE, img);
 105 }
 106
 107
 108 static void
 109 makeImages(int image)
 110 {
 111 #define WIDTH 512
 112 #define HEIGHT 512
 113    if (glutExtensionSupported("GL_SGIS_generate_mipmap") && image) {
 114       /* test auto mipmap generation */
 115       GLint width, height, i;
 116       GLenum format;
 117       GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format);
 118       if (!image) {
 119          printf("Error: could not load texture image %s\n", TEXTURE_FILE);
 120          exit(1);
 121       }
 122       /* resize */
 123       if (width != WIDTH || height != HEIGHT) {
 124          GLubyte *newImage = malloc(WIDTH * HEIGHT * 4);
 125          gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
 126                        WIDTH, HEIGHT, GL_UNSIGNED_BYTE, newImage);
 127          free(image);
 128          image = newImage;
 129       }
 130       printf("Using GL_SGIS_generate_mipmap\n");
 131       glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
 132       glTexImage2D(GL_TEXTURE_2D, 0, format, WIDTH, HEIGHT, 0,
 133                    format, GL_UNSIGNED_BYTE, image);
 134       glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
 135       free(image);
 136
 137       /* make sure mipmap was really generated correctly */
 138       width = WIDTH;
 139       height = HEIGHT;
 140       for (i = 0; i < 10; i++) {
 141          GLint w, h;
 142          glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
 143          glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
 144          printf("Level %d size: %d x %d\n", i, w, h);
 145          width /= 2;
 146          height /= 2;
 147       }
 148    }
 149    else {
 150       static const GLubyte colors[10][3] = {
 151          {128, 128, 128},
 152          {0, 255, 255},
 153          {255, 255, 0},
 154          {255, 0, 255},
 155          {255, 0, 0},
 156          {0, 255, 0},
 157          {0, 0, 255},
 158          {0, 255, 255},
 159          {255, 255, 0},
 160          {255, 255, 255}
 161       };
 162       int i, sz = 512;
 163
 164       for (i = 0; i < 10; i++) {
 165          MakeImage(i, sz, sz, colors[i]);
 166          printf("Level %d size: %d x %d\n", i, sz, sz);
 167          sz /= 2;
 168       }
 169    }
 170 }
 171
 172 static void
 173 myinit(void)
 174 {
 175    InitValues();
 176
 177    glEnable(GL_DEPTH_TEST);
 178    glDepthFunc(GL_LESS);
 179    glShadeModel(GL_FLAT);
 180
 181    glTranslatef(0.0, 0.0, -3.6);
 182
 183    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 184    glGenTextures(1, &texImage);
 185    glBindTexture(GL_TEXTURE_2D, texImage);
 186    makeImages(1);
 187    glGenTextures(1, &texColor);
 188    glBindTexture(GL_TEXTURE_2D, texColor);
 189    makeImages(0);
 190
 191    texCurrent = texImage;
 192
 193    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 194    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 195    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
 196    glEnable(GL_TEXTURE_2D);
 197 }
 198
 199 static void
 200 display(void)
 201 {
 202    GLfloat tcm = 1.0;
 203    glBindTexture(GL_TEXTURE_2D, texCurrent);
 204
 205    printf
 206       ("BASE_LEVEL=%d  MAX_LEVEL=%d  MIN_LOD=%.2g  MAX_LOD=%.2g  Bias=%.2g  Filter=%s\n",
 207        BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
 208        NearestFilter ? "NEAREST" : "LINEAR");
 209    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
 210    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
 211
 212    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
 213    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
 214
 215    if (NearestFilter) {
 216       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 217       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 218                       GL_NEAREST_MIPMAP_NEAREST);
 219    }
 220    else {
 221       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 222       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 223                       GL_LINEAR_MIPMAP_LINEAR);
 224    }
 225
 226    glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
 227
 228    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 229    glBegin(GL_QUADS);
 230    glTexCoord2f(0.0, 0.0);
 231    glVertex3f(-2.0, -1.0, 0.0);
 232    glTexCoord2f(0.0, tcm);
 233    glVertex3f(-2.0, 1.0, 0.0);
 234    glTexCoord2f(tcm * 3000.0, tcm);
 235    glVertex3f(3000.0, 1.0, -6000.0);
 236    glTexCoord2f(tcm * 3000.0, 0.0);
 237    glVertex3f(3000.0, -1.0, -6000.0);
 238    glEnd();
 239    glFlush();
 240 }
 241
 242 static void
 243 myReshape(int w, int h)
 244 {
 245    glViewport(0, 0, w, h);
 246    glMatrixMode(GL_PROJECTION);
 247    glLoadIdentity();
 248    gluPerspective(60.0, 1.0 * (GLfloat) w / (GLfloat) h, 1.0, 30000.0);
 249    glMatrixMode(GL_MODELVIEW);
 250    glLoadIdentity();
 251 }
 252
 253
 254 static void
 255 usage(void)
 256 {
 257    printf("usage:\n");
 258    printf("  b/B    decrease/increase GL_TEXTURE_BASE_LEVEL\n");
 259    printf("  m/M    decrease/increase GL_TEXTURE_MAX_LEVEL\n");
 260    printf("  n/N    decrease/increase GL_TEXTURE_MIN_LOD\n");
 261    printf("  x/X    decrease/increase GL_TEXTURE_MAX_LOD\n");
 262    printf("  l/L    decrease/increase GL_TEXTURE_LOD_BIAS\n");
 263    printf("  f      toggle nearest/linear filtering\n");
 264    printf("  t      toggle texture color/image\n");
 265    printf("  SPACE  reset values\n");
 266 }
 267
 268 static void
 269 key(unsigned char k, int x, int y)
 270 {
 271    (void) x;
 272    (void) y;
 273    switch (k) {
 274    case 'b':
 275       BaseLevel--;
 276       if (BaseLevel < 0)
 277          BaseLevel = 0;
 278       break;
 279    case 'B':
 280       BaseLevel++;
 281       if (BaseLevel > 10)
 282          BaseLevel = 10;
 283       break;
 284    case 'm':
 285       MaxLevel--;
 286       if (MaxLevel < 0)
 287          MaxLevel = 0;
 288       break;
 289    case 'M':
 290       MaxLevel++;
 291       if (MaxLevel > 10)
 292          MaxLevel = 10;
 293       break;
 294    case 'l':
 295       LodBias -= 0.25;
 296       break;
 297    case 'L':
 298       LodBias += 0.25;
 299       break;
 300    case 'n':
 301       MinLod -= 0.25;
 302       break;
 303    case 'N':
 304       MinLod += 0.25;
 305       break;
 306    case 'x':
 307       MaxLod -= 0.25;
 308       break;
 309    case 'X':
 310       MaxLod += 0.25;
 311       break;
 312    case 'f':
 313       NearestFilter = !NearestFilter;
 314       break;
 315    case 't':
 316       if (texCurrent == texColor)
 317          texCurrent = texImage;
 318       else
 319          texCurrent = texColor;
 320       break;
 321    case ' ':
 322       InitValues();
 323       /* fall-through */
 324    case 'u':
 325       usage();
 326       break;
 327    case 27:                    /* Escape */
 328       exit(0);
 329       break;
 330    default:
 331       return;
 332    }
 333    glutPostRedisplay();
 334 }
 335
 336
 337 int
 338 main(int argc, char **argv)
 339 {
 340    glutInit(&argc, argv);
 341    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 342    glutInitWindowSize(600, 600);
 343    glutCreateWindow(argv[0]);
 344    glewInit();
 345    myinit();
 346    glutReshapeFunc(myReshape);
 347    glutDisplayFunc(display);
 348    glutKeyboardFunc(key);
 349    usage();
 350    glutMainLoop();
 351    return 0;                    /* ANSI C requires main to return int. */
 352 }