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  39  * Unpublished-- rights reserved under the copyright laws of the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 MakeImage(int level, int width, int height, const GLubyte color[4])
  81 {
  82    const int makeStripes = 0;
  83    GLubyte img[512*512*3];
  84    int i, j;
  85    for (i = 0; i < height; i++) {
  86       for (j = 0; j < width; j++) {
  87          int k = (i * width + j) * 3;
  88          int p = (i/8) & makeStripes;
  89          if (p == 0) {
  90             img[k + 0] = color[0];
  91             img[k + 1] = color[1];
  92             img[k + 2] = color[2];
  93          }
  94          else {
  95             img[k + 0] = 0;
  96             img[k + 1] = 0;
  97             img[k + 2] = 0;
  98          }
  99       }
 100    }
 101
 102    glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, width, height, 0,
 103                 GL_RGB, GL_UNSIGNED_BYTE, img);
 104 }
 105
 106
 107 static void makeImages(int image)
 108 {
 109 #define WIDTH 512
 110 #define HEIGHT 512
 111    if (glutExtensionSupported("GL_SGIS_generate_mipmap") && image) {
 112       /* test auto mipmap generation */
 113       GLint width, height, i;
 114       GLenum format;
 115       GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format);
 116       if (!image) {
 117          printf("Error: could not load texture image %s\n", TEXTURE_FILE);
 118          exit(1);
 119       }
 120       /* resize */
 121       if (width != WIDTH || height != HEIGHT) {
 122          GLubyte *newImage = malloc(WIDTH * HEIGHT * 4);
 123          gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
 124                WIDTH, HEIGHT, GL_UNSIGNED_BYTE, newImage);
 125          free(image);
 126          image = newImage;
 127       }
 128       printf("Using GL_SGIS_generate_mipmap\n");
 129       glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
 130       glTexImage2D(GL_TEXTURE_2D, 0, format, WIDTH, HEIGHT, 0,
 131             format, GL_UNSIGNED_BYTE, image);
 132       glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
 133       free(image);
 134
 135       /* make sure mipmap was really generated correctly */
 136       width = WIDTH; height = HEIGHT;
 137       for (i = 0; i < 10; i++) {
 138          GLint w, h;
 139          glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
 140          glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
 141          printf("Level %d size: %d x %d\n", i, w, h);
 142          width /= 2;
 143          height /= 2;
 144       }
 145    } else {
 146       static const GLubyte colors[10][3] = {
 147          {128, 128, 128 },
 148          { 0, 255, 255 },
 149          { 255, 255, 0 },
 150          { 255, 0, 255 },
 151          { 255, 0, 0 },
 152          { 0, 255, 0 },
 153          { 0, 0, 255 },
 154          { 0, 255, 255 },
 155          { 255, 255, 0 },
 156          { 255, 255, 255 }
 157       };
 158       int i, sz = 512;
 159
 160       for (i = 0; i < 10; i++) {
 161          MakeImage(i, sz, sz, colors[i]);
 162          printf("Level %d size: %d x %d\n", i, sz, sz);
 163          sz /= 2;
 164       }
 165    }
 166 }
 167
 168 static void myinit(void)
 169 {
 170    InitValues();
 171
 172    glEnable(GL_DEPTH_TEST);
 173    glDepthFunc(GL_LESS);
 174    glShadeModel(GL_FLAT);
 175
 176    glTranslatef(0.0, 0.0, -3.6);
 177
 178    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 179    glGenTextures(1, &texImage);
 180    glBindTexture(GL_TEXTURE_2D, texImage);
 181    makeImages(1);
 182    glGenTextures(1, &texColor);
 183    glBindTexture(GL_TEXTURE_2D, texColor);
 184    makeImages(0);
 185
 186    texCurrent = texImage;
 187
 188    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
 189    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 190    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
 191    glEnable(GL_TEXTURE_2D);
 192 }
 193
 194 static void display(void)
 195 {
 196    GLfloat tcm = 1.0;
 197    glBindTexture(GL_TEXTURE_2D, texCurrent);
 198
 199    printf("BASE_LEVEL=%d  MAX_LEVEL=%d  MIN_LOD=%.2g  MAX_LOD=%.2g  Bias=%.2g  Filter=%s\n",
 200          BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
 201          NearestFilter ? "NEAREST" : "LINEAR");
 202    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
 203    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
 204
 205    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
 206    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
 207
 208    if (NearestFilter) {
 209       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 210       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 211             GL_NEAREST_MIPMAP_NEAREST);
 212    }
 213    else {
 214       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 215       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
 216             GL_LINEAR_MIPMAP_LINEAR);
 217    }
 218
 219    glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
 220
 221    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 222    glBegin(GL_QUADS);
 223    glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
 224    glTexCoord2f(0.0, tcm); glVertex3f(-2.0, 1.0, 0.0);
 225    glTexCoord2f(tcm * 3000.0, tcm); glVertex3f(3000.0, 1.0, -6000.0);
 226    glTexCoord2f(tcm * 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
 227    glEnd();
 228    glFlush();
 229 }
 230
 231 static void myReshape(int w, int h)
 232 {
 233    glViewport(0, 0, w, h);
 234    glMatrixMode(GL_PROJECTION);
 235    glLoadIdentity();
 236    gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0);
 237    glMatrixMode(GL_MODELVIEW);
 238    glLoadIdentity();
 239 }
 240
 241 static void
 242 key(unsigned char k, int x, int y)
 243 {
 244   (void) x;
 245   (void) y;
 246   switch (k) {
 247   case 'b':
 248      BaseLevel--;
 249      if (BaseLevel < 0)
 250         BaseLevel = 0;
 251      break;
 252   case 'B':
 253      BaseLevel++;
 254      if (BaseLevel > 10)
 255         BaseLevel = 10;
 256      break;
 257   case 'm':
 258      MaxLevel--;
 259      if (MaxLevel < 0)
 260         MaxLevel = 0;
 261      break;
 262   case 'M':
 263      MaxLevel++;
 264      if (MaxLevel > 10)
 265         MaxLevel = 10;
 266      break;
 267   case 'l':
 268      LodBias -= 0.25;
 269      break;
 270   case 'L':
 271      LodBias += 0.25;
 272      break;
 273   case 'n':
 274      MinLod -= 0.25;
 275      break;
 276   case 'N':
 277      MinLod += 0.25;
 278      break;
 279   case 'x':
 280      MaxLod -= 0.25;
 281      break;
 282   case 'X':
 283      MaxLod += 0.25;
 284      break;
 285   case 'f':
 286      NearestFilter = !NearestFilter;
 287      break;
 288   case 't':
 289      if (texCurrent == texColor)
 290         texCurrent = texImage;
 291      else
 292         texCurrent = texColor;
 293      break;
 294   case ' ':
 295      InitValues();
 296      break;
 297   case 27:  /* Escape */
 298     exit(0);
 299     break;
 300   default:
 301     return;
 302   }
 303   glutPostRedisplay();
 304 }
 305
 306
 307 static void usage(void)
 308 {
 309    printf("usage:\n");
 310    printf("  b/B    decrease/increase GL_TEXTURE_BASE_LEVEL\n");
 311    printf("  m/M    decrease/increase GL_TEXTURE_MAX_LEVEL\n");
 312    printf("  n/N    decrease/increase GL_TEXTURE_MIN_LOD\n");
 313    printf("  x/X    decrease/increase GL_TEXTURE_MAX_LOD\n");
 314    printf("  l/L    decrease/increase GL_TEXTURE_LOD_BIAS\n");
 315    printf("  f      toggle nearest/linear filtering\n");
 316    printf("  t      toggle texture color/image\n");
 317    printf("  SPACE  reset values\n");
 318 }
 319
 320
 321 int main(int argc, char** argv)
 322 {
 323     glutInit(&argc, argv);
 324     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 325     glutInitWindowSize (600, 600);
 326     glutCreateWindow (argv[0]);
 327     glewInit();
 328     myinit();
 329     glutReshapeFunc (myReshape);
 330     glutDisplayFunc(display);
 331     glutKeyboardFunc(key);
 332     usage();
 333     glutMainLoop();
 334     return 0;             /* ANSI C requires main to return int. */
 335 }