progs/tests/packedpixels.c

   1 /*
   2  * Test packed pixel formats for textures.
   3  * Brian Paul
   4  * 12 May 2004
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <math.h>
  10 #include <string.h>
  11 #include <GL/glut.h>
  12
  13
  14 struct pixel_format {
  15    const char *name;
  16    GLenum format;
  17    GLenum type;
  18    GLint bytes;
  19    GLuint redTexel, greenTexel;
  20 };
  21
  22 static const struct pixel_format Formats[] = {
  23
  24    { "GL_RGBA/GL_UNSIGNED_INT_8_8_8_8",
  25      GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, 4, 0xff000000, 0x00ff0000 },
  26    { "GL_RGBA/GL_UNSIGNED_INT_8_8_8_8_REV",
  27      GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, 4, 0x000000ff, 0x0000ff00 },
  28    { "GL_RGBA/GL_UNSIGNED_INT_10_10_10_2",
  29      GL_RGBA, GL_UNSIGNED_INT_10_10_10_2, 4, 0xffc00000, 0x3ff000 },
  30    { "GL_RGBA/GL_UNSIGNED_INT_2_10_10_10_REV",
  31      GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, 4, 0x3ff, 0xffc00 },
  32    { "GL_RGBA/GL_UNSIGNED_SHORT_4_4_4_4",
  33      GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 2, 0xf000, 0x0f00 },
  34    { "GL_RGBA/GL_UNSIGNED_SHORT_4_4_4_4_REV",
  35      GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4_REV, 2, 0x000f, 0x00f0 },
  36    { "GL_RGBA/GL_UNSIGNED_SHORT_5_5_5_1",
  37      GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 2, 0xf800, 0x7c0 },
  38    { "GL_RGBA/GL_UNSIGNED_SHORT_1_5_5_5_REV",
  39      GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, 2, 0x1f, 0x3e0 },
  40
  41    { "GL_BGRA/GL_UNSIGNED_INT_8_8_8_8",
  42      GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, 4, 0x0000ff00, 0x00ff0000 },
  43    { "GL_BGRA/GL_UNSIGNED_INT_8_8_8_8_REV",
  44      GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, 4, 0x00ff0000, 0x0000ff00 },
  45    { "GL_BGRA/GL_UNSIGNED_SHORT_4_4_4_4",
  46      GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4, 2, 0x00f0, 0x0f00 },
  47    { "GL_BGRA/GL_UNSIGNED_SHORT_4_4_4_4_REV",
  48      GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4_REV, 2, 0x0f00, 0x00f0 },
  49    { "GL_BGRA/GL_UNSIGNED_SHORT_5_5_5_1",
  50      GL_BGRA, GL_UNSIGNED_SHORT_5_5_5_1, 2, 0x3e, 0x7c0 },
  51    { "GL_BGRA/GL_UNSIGNED_SHORT_1_5_5_5_REV",
  52      GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV, 2, 0x7c00, 0x3e0 },
  53
  54    { "GL_ABGR_EXT/GL_UNSIGNED_INT_8_8_8_8",
  55      GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8, 4, 0x000000ff, 0x0000ff00 },
  56    { "GL_ABGR_EXT/GL_UNSIGNED_INT_8_8_8_8_REV",
  57      GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, 4, 0xff000000, 0x00ff0000 },
  58    { "GL_ABGR_EXT/GL_UNSIGNED_SHORT_4_4_4_4",
  59      GL_ABGR_EXT, GL_UNSIGNED_SHORT_4_4_4_4, 2, 0x000f, 0x00f0 },
  60    { "GL_ABGR_EXT/GL_UNSIGNED_SHORT_4_4_4_4_REV",
  61      GL_ABGR_EXT, GL_UNSIGNED_SHORT_4_4_4_4_REV, 2, 0xf000, 0x0f00 },
  62    { "GL_ABGR_EXT/GL_UNSIGNED_SHORT_5_5_5_1",
  63      GL_ABGR_EXT, GL_UNSIGNED_SHORT_5_5_5_1, 2, 0x1, 0x3e },
  64    { "GL_ABGR_EXT/GL_UNSIGNED_SHORT_1_5_5_5_REV",
  65      GL_ABGR_EXT, GL_UNSIGNED_SHORT_1_5_5_5_REV, 2, 0x8000, 0x7c00 },
  66
  67    { "GL_RGB/GL_UNSIGNED_SHORT_5_6_5",
  68      GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 2, 0xf800, 0x7e0 },
  69    { "GL_RGB/GL_UNSIGNED_SHORT_5_6_5_REV",
  70      GL_RGB, GL_UNSIGNED_SHORT_5_6_5_REV, 2, 0x1f, 0x7e0 },
  71    { "GL_RGB/GL_UNSIGNED_BYTE_3_3_2",
  72      GL_RGB, GL_UNSIGNED_BYTE_3_3_2, 1, 0xe0, 0x1c },
  73    { "GL_RGB/GL_UNSIGNED_BYTE_2_3_3_REV",
  74      GL_RGB, GL_UNSIGNED_BYTE_2_3_3_REV, 1, 0x7, 0x38 },
  75
  76    { NULL, 0, 0, 0, 0, 0 }
  77 };
  78
  79
  80 struct name_format {
  81    const char *name;
  82    GLenum format;
  83 };
  84
  85 static const struct name_format IntFormats[] = {
  86    { "GL_RGBA", GL_RGBA },
  87    { "GL_RGBA2", GL_RGBA2 },
  88    { "GL_RGBA4", GL_RGBA4 },
  89    { "GL_RGB5_A1", GL_RGB5_A1 },
  90    { "GL_RGBA8", GL_RGBA8 },
  91    { "GL_RGBA12", GL_RGBA12 },
  92    { "GL_RGBA16", GL_RGBA16 },
  93    { "GL_RGB10_A2", GL_RGB10_A2 },
  94
  95    { "GL_RGB", GL_RGB },
  96    { "GL_R3_G3_B2", GL_R3_G3_B2 },
  97    { "GL_RGB4", GL_RGB4 },
  98    { "GL_RGB5", GL_RGB5 },
  99    { "GL_RGB8", GL_RGB8 },
 100    { "GL_RGB10", GL_RGB10 },
 101    { "GL_RGB12", GL_RGB12 },
 102    { "GL_RGB16", GL_RGB16 },
 103
 104 };
 105
 106 #define NUM_INT_FORMATS (sizeof(IntFormats) / sizeof(IntFormats[0]))
 107 static GLuint CurFormat = 0;
 108
 109 static GLboolean Test3D = GL_FALSE;
 110
 111
 112
 113 static void
 114 PrintString(const char *s)
 115 {
 116    while (*s) {
 117       glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
 118       s++;
 119    }
 120 }
 121
 122
 123 static void
 124 MakeTexture(const struct pixel_format *format, GLenum intFormat, GLboolean swap)
 125 {
 126    GLubyte texBuffer[1000];
 127    int i;
 128
 129    glPixelStorei(GL_UNPACK_SWAP_BYTES, swap);
 130
 131    if (format->bytes == 1) {
 132       for (i = 0; i < 8; i++) {
 133          texBuffer[i] = format->redTexel;
 134       }
 135       for (i = 8; i < 16; i++) {
 136          texBuffer[i] = format->greenTexel;
 137       }
 138    }
 139    else if (format->bytes == 2) {
 140       GLushort *us = (GLushort *) texBuffer;
 141       for (i = 0; i < 8; i++) {
 142          us[i] = format->redTexel;
 143       }
 144       for (i = 8; i < 16; i++) {
 145          us[i] = format->greenTexel;
 146       }
 147       if (swap) {
 148          for (i = 0; i < 16; i++)
 149             us[i] = (us[i] << 8) | (us[i] >> 8);
 150       }
 151    }
 152    else if (format->bytes == 4) {
 153       GLuint *ui = (GLuint *) texBuffer;
 154       for (i = 0; i < 8; i++) {
 155          ui[i] = format->redTexel;
 156       }
 157       for (i = 8; i < 16; i++) {
 158          ui[i] = format->greenTexel;
 159       }
 160       if (swap) {
 161          for (i = 0; i < 16; i++) {
 162             GLuint b = ui[i];
 163             ui[i] =  (b >> 24)
 164                   | ((b >> 8) & 0xff00)
 165                   | ((b << 8) & 0xff0000)
 166                   | ((b << 24) & 0xff000000);
 167          }
 168       }
 169    }
 170    else {
 171       abort();
 172    }
 173
 174    if (Test3D) {
 175       /* 4 x 4 x 4 texture, undefined data */
 176       glTexImage3D(GL_TEXTURE_3D, 0, intFormat, 4, 4, 4, 0,
 177                    format->format, format->type, NULL);
 178       /* fill in Z=1 and Z=2 slices with the real texture data */
 179       glTexSubImage3D(GL_TEXTURE_3D, 0,
 180                       0, 0, 1,  /* offset */
 181                       4, 4, 1,  /* size */
 182                       format->format, format->type, texBuffer);
 183       glTexSubImage3D(GL_TEXTURE_3D, 0,
 184                       0, 0, 2,  /* offset */
 185                       4, 4, 1,  /* size */
 186                       format->format, format->type, texBuffer);
 187    }
 188    else {
 189       glTexImage2D(GL_TEXTURE_2D, 0, intFormat, 4, 4, 0,
 190                    format->format, format->type, texBuffer);
 191    }
 192
 193    if (glGetError()) {
 194       printf("GL Error for %s\n", format->name);
 195       memset(texBuffer, 255, 1000);
 196       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 4, 4, 0,
 197                    GL_RGB, GL_UNSIGNED_BYTE, texBuffer);
 198    }
 199 }
 200
 201
 202
 203 static void
 204 Draw(void)
 205 {
 206    char s[1000];
 207    int w = 350, h = 20;
 208    int i, swap;
 209
 210    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 211
 212    for (swap = 0; swap < 2; swap++) {
 213      for (i = 0; Formats[i].name; i++) {
 214         glPushMatrix();
 215         glTranslatef(swap * (w + 2), i * (h + 2), 0);
 216
 217         MakeTexture(Formats + i, IntFormats[CurFormat].format, swap);
 218
 219         if (Test3D)
 220            glEnable(GL_TEXTURE_3D);
 221         else
 222            glEnable(GL_TEXTURE_2D);
 223         glBegin(GL_POLYGON);
 224         glTexCoord3f(0, 0, 0.5);  glVertex2f(0, 0);
 225         glTexCoord3f(1, 0, 0.5);  glVertex2f(w, 0);
 226         glTexCoord3f(1, 1, 0.5);  glVertex2f(w, h);
 227         glTexCoord3f(0, 1, 0.5);  glVertex2f(0, h);
 228         glEnd();
 229
 230         if (Test3D)
 231            glDisable(GL_TEXTURE_3D);
 232         else
 233            glDisable(GL_TEXTURE_2D);
 234         glColor3f(0, 0, 0);
 235         glRasterPos2i(8, 6);
 236         PrintString(Formats[i].name);
 237
 238         glPopMatrix();
 239      }
 240    }
 241
 242    glPushMatrix();
 243    glTranslatef(2, i * (h + 2), 0);
 244    glColor3f(1, 1, 1);
 245    glRasterPos2i(8, 6);
 246    PrintString("Normal");
 247    glRasterPos2i(w + 2, 6);
 248    PrintString("Byte Swapped");
 249    glPopMatrix();
 250
 251    glPushMatrix();
 252    glTranslatef(2, (i + 1) * (h + 2), 0);
 253    glRasterPos2i(8, 6);
 254    sprintf(s, "Internal Texture Format [f/F]: %s (%d of %d)",
 255            IntFormats[CurFormat].name, CurFormat + 1, NUM_INT_FORMATS);
 256    PrintString(s);
 257    glPopMatrix();
 258
 259    glutSwapBuffers();
 260 }
 261
 262
 263 static void
 264 Reshape(int width, int height)
 265 {
 266    glViewport(0, 0, width, height);
 267    glMatrixMode(GL_PROJECTION);
 268    glLoadIdentity();
 269    glOrtho(0, width, 0, height, -1, 1);
 270    glMatrixMode(GL_MODELVIEW);
 271    glLoadIdentity();
 272 }
 273
 274
 275 static void
 276 Key(unsigned char key, int x, int y)
 277 {
 278    (void) x;
 279    (void) y;
 280    switch (key) {
 281       case 'F':
 282          if (CurFormat == 0)
 283             CurFormat = NUM_INT_FORMATS - 1;
 284          else
 285             CurFormat--;
 286          break;
 287       case 'f':
 288          CurFormat++;
 289          if (CurFormat == NUM_INT_FORMATS)
 290             CurFormat = 0;
 291          break;
 292       case '2':
 293          Test3D = GL_FALSE;
 294          printf("Using 2D textures\n");
 295          break;
 296       case '3':
 297          Test3D = GL_TRUE;
 298          printf("Using 3D textures\n");
 299          break;
 300       case 27:
 301          exit(0);
 302          break;
 303    }
 304    glutPostRedisplay();
 305 }
 306
 307
 308 static void
 309 Init(void)
 310 {
 311    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 312    printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
 313    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 314    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 315    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 316    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 317    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 318 }
 319
 320
 321 int
 322 main(int argc, char *argv[])
 323 {
 324    glutInit(&argc, argv);
 325    glutInitWindowPosition(0, 0);
 326    glutInitWindowSize(700, 800);
 327    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 328    glutCreateWindow(argv[0]);
 329    glutReshapeFunc(Reshape);
 330    glutKeyboardFunc(Key);
 331    glutDisplayFunc(Draw);
 332    Init();
 333    glutMainLoop();
 334    return 0;
 335 }