src/mesa/main/texformat_tmp.h

   1 /**
   2  * \file texformat_tmp.h
   3  * Texel fetch functions template.
   4  *
   5  * This template file is used by texformat.c to generate texel fetch functions
   6  * for 1-D, 2-D and 3-D texture images.
   7  *
   8  * It should be expanded by definining \p DIM as the number texture dimensions
   9  * (1, 2 or 3).  According to the value of \p DIM a serie of macros is defined
  10  * for the texel lookup in the gl_texture_image::Data.
  11  *
  12  * \sa texformat.c and FetchTexel.
  13  *
  14  * \author Gareth Hughes
  15  * \author Brian Paul
  16  */
  17
  18 /*
  19  * Mesa 3-D graphics library
  20  * Version:  5.1
  21  *
  22  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
  23  *
  24  * Permission is hereby granted, free of charge, to any person obtaining a
  25  * copy of this software and associated documentation files (the "Software"),
  26  * to deal in the Software without restriction, including without limitation
  27  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  28  * and/or sell copies of the Software, and to permit persons to whom the
  29  * Software is furnished to do so, subject to the following conditions:
  30  *
  31  * The above copyright notice and this permission notice shall be included
  32  * in all copies or substantial portions of the Software.
  33  *
  34  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  35  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  36  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  37  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  38  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  39  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  40  */
  41
  42
  43 #if DIM == 1
  44
  45 #define CHAN_SRC( t, i, j, k, sz )                                      \
  46         ((GLchan *)(t)->Data + (i) * (sz))
  47 #define UBYTE_SRC( t, i, j, k, sz )                                     \
  48         ((GLubyte *)(t)->Data + (i) * (sz))
  49 #define USHORT_SRC( t, i, j, k )                                        \
  50         ((GLushort *)(t)->Data + (i))
  51 #define FLOAT_SRC( t, i, j, k )                                         \
  52         ((GLfloat *)(t)->Data + (i))
  53
  54 #define FETCH(x) fetch_1d_texel_##x
  55
  56 #elif DIM == 2
  57
  58 #define CHAN_SRC( t, i, j, k, sz )                                      \
  59         ((GLchan *)(t)->Data + ((t)->RowStride * (j) + (i)) * (sz))
  60 #define UBYTE_SRC( t, i, j, k, sz )                                     \
  61         ((GLubyte *)(t)->Data + ((t)->RowStride * (j) + (i)) * (sz))
  62 #define USHORT_SRC( t, i, j, k )                                        \
  63         ((GLushort *)(t)->Data + ((t)->RowStride * (j) + (i)))
  64 #define FLOAT_SRC( t, i, j, k )                                         \
  65         ((GLfloat *)(t)->Data + ((t)->RowStride * (j) + (i)))
  66
  67 #define FETCH(x) fetch_2d_texel_##x
  68
  69 #elif DIM == 3
  70
  71 #define CHAN_SRC( t, i, j, k, sz )                                      \
  72         (GLchan *)(t)->Data + (((t)->Height * (k) + (j)) *              \
  73                                 (t)->RowStride + (i)) * (sz)
  74 #define UBYTE_SRC( t, i, j, k, sz )                                     \
  75         ((GLubyte *)(t)->Data + (((t)->Height * (k) + (j)) *            \
  76                                  (t)->RowStride + (i)) * (sz))
  77 #define USHORT_SRC( t, i, j, k )                                        \
  78         ((GLushort *)(t)->Data + (((t)->Height * (k) + (j)) *           \
  79                                   (t)->RowStride + (i)))
  80 #define FLOAT_SRC( t, i, j, k )                                         \
  81         ((GLfloat *)(t)->Data + (((t)->Height * (k) + (j)) *            \
  82                                   (t)->RowStride + (i)))
  83
  84 #define FETCH(x) fetch_3d_texel_##x
  85
  86 #else
  87 #error  illegal number of texture dimensions
  88 #endif
  89
  90
  91 static void FETCH(rgba)( const struct gl_texture_image *texImage,
  92                          GLint i, GLint j, GLint k, GLvoid *texel )
  93 {
  94    const GLchan *src = CHAN_SRC( texImage, i, j, k, 4 );
  95    GLchan *rgba = (GLchan *) texel;
  96    COPY_CHAN4( rgba, src );
  97 }
  98
  99 static void FETCH(rgb)( const struct gl_texture_image *texImage,
 100                         GLint i, GLint j, GLint k, GLvoid *texel )
 101 {
 102    const GLchan *src = CHAN_SRC( texImage, i, j, k, 3 );
 103    GLchan *rgba = (GLchan *) texel;
 104    rgba[RCOMP] = src[0];
 105    rgba[GCOMP] = src[1];
 106    rgba[BCOMP] = src[2];
 107    rgba[ACOMP] = CHAN_MAX;
 108 }
 109
 110 static void FETCH(alpha)( const struct gl_texture_image *texImage,
 111                           GLint i, GLint j, GLint k, GLvoid *texel )
 112 {
 113    const GLchan *src = CHAN_SRC( texImage, i, j, k, 1 );
 114    GLchan *rgba = (GLchan *) texel;
 115    rgba[RCOMP] = 0;
 116    rgba[GCOMP] = 0;
 117    rgba[BCOMP] = 0;
 118    rgba[ACOMP] = src[0];
 119 }
 120
 121 static void FETCH(luminance)( const struct gl_texture_image *texImage,
 122                               GLint i, GLint j, GLint k, GLvoid *texel )
 123 {
 124    const GLchan *src = CHAN_SRC( texImage, i, j, k, 1 );
 125    GLchan *rgba = (GLchan *) texel;
 126    rgba[RCOMP] = src[0];
 127    rgba[GCOMP] = src[0];
 128    rgba[BCOMP] = src[0];
 129    rgba[ACOMP] = CHAN_MAX;
 130 }
 131
 132 static void FETCH(luminance_alpha)( const struct gl_texture_image *texImage,
 133                                     GLint i, GLint j, GLint k, GLvoid *texel )
 134 {
 135    const GLchan *src = CHAN_SRC( texImage, i, j, k, 2 );
 136    GLchan *rgba = (GLchan *) texel;
 137    rgba[RCOMP] = src[0];
 138    rgba[GCOMP] = src[0];
 139    rgba[BCOMP] = src[0];
 140    rgba[ACOMP] = src[1];
 141 }
 142
 143 static void FETCH(intensity)( const struct gl_texture_image *texImage,
 144                               GLint i, GLint j, GLint k, GLvoid *texel )
 145 {
 146    const GLchan *src = CHAN_SRC( texImage, i, j, k, 1 );
 147    GLchan *rgba = (GLchan *) texel;
 148    rgba[RCOMP] = src[0];
 149    rgba[GCOMP] = src[0];
 150    rgba[BCOMP] = src[0];
 151    rgba[ACOMP] = src[0];
 152 }
 153
 154 static void FETCH(color_index)( const struct gl_texture_image *texImage,
 155                                 GLint i, GLint j, GLint k, GLvoid *texel )
 156 {
 157    const GLchan *src = CHAN_SRC( texImage, i, j, k, 1 );
 158    GLchan *index = (GLchan *) texel;
 159    *index = *src;
 160 }
 161
 162 static void FETCH(depth_component)( const struct gl_texture_image *texImage,
 163                                     GLint i, GLint j, GLint k, GLvoid *texel )
 164 {
 165    const GLfloat *src = FLOAT_SRC( texImage, i, j, k );
 166    GLfloat *depth = (GLfloat *) texel;
 167    *depth = *src;
 168 }
 169
 170 static void FETCH(rgba8888)( const struct gl_texture_image *texImage,
 171                              GLint i, GLint j, GLint k, GLvoid *texel )
 172 {
 173    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 4 );
 174    GLchan *rgba = (GLchan *) texel;
 175    rgba[RCOMP] = UBYTE_TO_CHAN( src[3] );
 176    rgba[GCOMP] = UBYTE_TO_CHAN( src[2] );
 177    rgba[BCOMP] = UBYTE_TO_CHAN( src[1] );
 178    rgba[ACOMP] = UBYTE_TO_CHAN( src[0] );
 179 }
 180
 181 static void FETCH(argb8888)( const struct gl_texture_image *texImage,
 182                              GLint i, GLint j, GLint k, GLvoid *texel )
 183 {
 184    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 4 );
 185    GLchan *rgba = (GLchan *) texel;
 186    rgba[RCOMP] = UBYTE_TO_CHAN( src[2] );
 187    rgba[GCOMP] = UBYTE_TO_CHAN( src[1] );
 188    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 189    rgba[ACOMP] = UBYTE_TO_CHAN( src[3] );
 190 }
 191
 192 static void FETCH(rgb888)( const struct gl_texture_image *texImage,
 193                            GLint i, GLint j, GLint k, GLvoid *texel )
 194 {
 195    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 3 );
 196    GLchan *rgba = (GLchan *) texel;
 197    rgba[RCOMP] = UBYTE_TO_CHAN( src[2] );
 198    rgba[GCOMP] = UBYTE_TO_CHAN( src[1] );
 199    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 200    rgba[ACOMP] = CHAN_MAX;
 201 }
 202
 203 static void FETCH(rgb565)( const struct gl_texture_image *texImage,
 204                            GLint i, GLint j, GLint k, GLvoid *texel )
 205 {
 206    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 207    const GLushort s = *src;
 208    GLchan *rgba = (GLchan *) texel;
 209    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >> 8) & 0xf8) * 255 / 0xf8 );
 210    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >> 3) & 0xfc) * 255 / 0xfc );
 211    rgba[BCOMP] = UBYTE_TO_CHAN( ((s << 3) & 0xf8) * 255 / 0xf8 );
 212    rgba[ACOMP] = CHAN_MAX;
 213 }
 214
 215 static void FETCH(argb4444)( const struct gl_texture_image *texImage,
 216                              GLint i, GLint j, GLint k, GLvoid *texel )
 217 {
 218    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 219    const GLushort s = *src;
 220    GLchan *rgba = (GLchan *) texel;
 221    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >>  8) & 0xf) * 255 / 0xf );
 222    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >>  4) & 0xf) * 255 / 0xf );
 223    rgba[BCOMP] = UBYTE_TO_CHAN( ((s      ) & 0xf) * 255 / 0xf );
 224    rgba[ACOMP] = UBYTE_TO_CHAN( ((s >> 12) & 0xf) * 255 / 0xf );
 225 }
 226
 227 static void FETCH(argb1555)( const struct gl_texture_image *texImage,
 228                              GLint i, GLint j, GLint k, GLvoid *texel )
 229 {
 230    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 231    const GLushort s = *src;
 232    GLchan *rgba = (GLchan *) texel;
 233    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >> 10) & 0x1f) * 255 / 0x1f );
 234    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >>  5) & 0x1f) * 255 / 0x1f );
 235    rgba[BCOMP] = UBYTE_TO_CHAN( ((s      ) & 0x1f) * 255 / 0x1f );
 236    rgba[ACOMP] = UBYTE_TO_CHAN( ((s >> 15) & 0x01) * 255 );
 237 }
 238
 239 static void FETCH(al88)( const struct gl_texture_image *texImage,
 240                          GLint i, GLint j, GLint k, GLvoid *texel )
 241 {
 242    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 2 );
 243    GLchan *rgba = (GLchan *) texel;
 244    rgba[RCOMP] = UBYTE_TO_CHAN( src[0] );
 245    rgba[GCOMP] = UBYTE_TO_CHAN( src[0] );
 246    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 247    rgba[ACOMP] = UBYTE_TO_CHAN( src[1] );
 248 }
 249
 250 static void FETCH(rgb332)( const struct gl_texture_image *texImage,
 251                            GLint i, GLint j, GLint k, GLvoid *texel )
 252 {
 253    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 254    const GLubyte s = *src;
 255    GLchan *rgba = (GLchan *) texel;
 256    rgba[RCOMP] = UBYTE_TO_CHAN( ((s     ) & 0xe0) * 255 / 0xe0 );
 257    rgba[GCOMP] = UBYTE_TO_CHAN( ((s << 3) & 0xe0) * 255 / 0xe0 );
 258    rgba[BCOMP] = UBYTE_TO_CHAN( ((s << 5) & 0xc0) * 255 / 0xc0 );
 259    rgba[ACOMP] = CHAN_MAX;
 260 }
 261
 262 static void FETCH(a8)( const struct gl_texture_image *texImage,
 263                        GLint i, GLint j, GLint k, GLvoid *texel )
 264 {
 265    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 266    GLchan *rgba = (GLchan *) texel;
 267    rgba[RCOMP] = 0;
 268    rgba[GCOMP] = 0;
 269    rgba[BCOMP] = 0;
 270    rgba[ACOMP] = UBYTE_TO_CHAN( src[0] );
 271 }
 272
 273 static void FETCH(l8)( const struct gl_texture_image *texImage,
 274                        GLint i, GLint j, GLint k, GLvoid *texel )
 275 {
 276    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 277    GLchan *rgba = (GLchan *) texel;
 278    rgba[RCOMP] = UBYTE_TO_CHAN( src[0] );
 279    rgba[GCOMP] = UBYTE_TO_CHAN( src[0] );
 280    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 281    rgba[ACOMP] = CHAN_MAX;
 282 }
 283
 284 static void FETCH(i8)( const struct gl_texture_image *texImage,
 285                        GLint i, GLint j, GLint k, GLvoid *texel )
 286 {
 287    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 288    GLchan *rgba = (GLchan *) texel;
 289    rgba[RCOMP] = UBYTE_TO_CHAN( src[0] );
 290    rgba[GCOMP] = UBYTE_TO_CHAN( src[0] );
 291    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 292    rgba[ACOMP] = UBYTE_TO_CHAN( src[0] );
 293 }
 294
 295 static void FETCH(ci8)( const struct gl_texture_image *texImage,
 296                         GLint i, GLint j, GLint k, GLvoid *texel )
 297 {
 298    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 299    GLchan *index = (GLchan *) texel;
 300    *index = UBYTE_TO_CHAN( *src );
 301 }
 302
 303 /* XXX this may break if GLchan != GLubyte */
 304 static void FETCH(ycbcr)( const struct gl_texture_image *texImage,
 305                           GLint i, GLint j, GLint k, GLvoid *texel )
 306 {
 307    const GLushort *src0 = USHORT_SRC( texImage, (i & ~1), j, k ); /* even */
 308    const GLushort *src1 = src0 + 1;                               /* odd */
 309    const GLubyte y0 = (*src0 >> 8) & 0xff;  /* luminance */
 310    const GLubyte cb = *src0 & 0xff;         /* chroma U */
 311    const GLubyte y1 = (*src1 >> 8) & 0xff;  /* luminance */
 312    const GLubyte cr = *src1 & 0xff;         /* chroma V */
 313    GLchan *rgba = (GLchan *) texel;
 314    GLint r, g, b;
 315    if (i & 1) {
 316       /* odd pixel: use y1,cr,cb */
 317       r = (GLint) (1.164 * (y1-16) + 1.596 * (cr-128));
 318       g = (GLint) (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
 319       b = (GLint) (1.164 * (y1-16) + 2.018 * (cb-128));
 320    }
 321    else {
 322       /* even pixel: use y0,cr,cb */
 323       r = (GLint) (1.164 * (y0-16) + 1.596 * (cr-128));
 324       g = (GLint) (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
 325       b = (GLint) (1.164 * (y0-16) + 2.018 * (cb-128));
 326    }
 327    rgba[RCOMP] = CLAMP(r, 0, CHAN_MAX);
 328    rgba[GCOMP] = CLAMP(g, 0, CHAN_MAX);
 329    rgba[BCOMP] = CLAMP(b, 0, CHAN_MAX);
 330    rgba[ACOMP] = CHAN_MAX;
 331 }
 332
 333 /* XXX this may break if GLchan != GLubyte */
 334 static void FETCH(ycbcr_rev)( const struct gl_texture_image *texImage,
 335                               GLint i, GLint j, GLint k, GLvoid *texel )
 336 {
 337    const GLushort *src0 = USHORT_SRC( texImage, (i & ~1), j, k ); /* even */
 338    const GLushort *src1 = src0 + 1;                               /* odd */
 339    const GLubyte y0 = *src0 & 0xff;         /* luminance */
 340    const GLubyte cr = (*src0 >> 8) & 0xff;  /* chroma U */
 341    const GLubyte y1 = *src1 & 0xff;         /* luminance */
 342    const GLubyte cb = (*src1 >> 8) & 0xff;  /* chroma V */
 343    GLchan *rgba = (GLchan *) texel;
 344    GLint r, g, b;
 345    if (i & 1) {
 346       /* odd pixel: use y1,cr,cb */
 347       r = (GLint) (1.164 * (y1-16) + 1.596 * (cr-128));
 348       g = (GLint) (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
 349       b = (GLint) (1.164 * (y1-16) + 2.018 * (cb-128));
 350    }
 351    else {
 352       /* even pixel: use y0,cr,cb */
 353       r = (GLint) (1.164 * (y0-16) + 1.596 * (cr-128));
 354       g = (GLint) (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
 355       b = (GLint) (1.164 * (y0-16) + 2.018 * (cb-128));
 356    }
 357    rgba[RCOMP] = CLAMP(r, 0, CHAN_MAX);
 358    rgba[GCOMP] = CLAMP(g, 0, CHAN_MAX);
 359    rgba[BCOMP] = CLAMP(b, 0, CHAN_MAX);
 360    rgba[ACOMP] = CHAN_MAX;
 361 }
 362
 363
 364 #if DIM == 2
 365 static void FETCH(rgb_dxt1)( const struct gl_texture_image *texImage,
 366                              GLint i, GLint j, GLint k, GLvoid *texel )
 367 {
 368    /* Extract the (i,j) pixel from texImage->Data and return it
 369     * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
 370     */
 371 }
 372 #endif
 373
 374 #if DIM == 2
 375 static void FETCH(rgba_dxt1)( const struct gl_texture_image *texImage,
 376                               GLint i, GLint j, GLint k, GLvoid *texel )
 377 {
 378    /* Extract the (i,j) pixel from texImage->Data and return it
 379     * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
 380     */
 381 }
 382 #endif
 383
 384 #if DIM == 2
 385 static void FETCH(rgba_dxt3)( const struct gl_texture_image *texImage,
 386                               GLint i, GLint j, GLint k, GLvoid *texel )
 387 {
 388    /* Extract the (i,j) pixel from texImage->Data and return it
 389     * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
 390     */
 391 }
 392 #endif
 393
 394 #if DIM == 2
 395 static void FETCH(rgba_dxt5)( const struct gl_texture_image *texImage,
 396                               GLint i, GLint j, GLint k, GLvoid *texel )
 397 {
 398    /* Extract the (i,j) pixel from texImage->Data and return it
 399     * in texel[RCOMP], texel[GCOMP], texel[BCOMP], texel[ACOMP].
 400     */
 401 }
 402 #endif
 403
 404
 405
 406 /* big-endian */
 407
 408 #if 0
 409 static void FETCH(abgr8888)( const struct gl_texture_image *texImage,
 410                              GLint i, GLint j, GLint k, GLvoid *texel )
 411 {
 412    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 4 );
 413    GLchan *rgba = (GLchan *) texel;
 414    rgba[RCOMP] = UBYTE_TO_CHAN( src[3] );
 415    rgba[GCOMP] = UBYTE_TO_CHAN( src[2] );
 416    rgba[BCOMP] = UBYTE_TO_CHAN( src[1] );
 417    rgba[ACOMP] = UBYTE_TO_CHAN( src[0] );
 418 }
 419
 420 static void FETCH(bgra8888)( const struct gl_texture_image *texImage,
 421                              GLint i, GLint j, GLint k, GLvoid *texel )
 422 {
 423    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 4 );
 424    GLchan *rgba = (GLchan *) texel;
 425    rgba[RCOMP] = UBYTE_TO_CHAN( src[2] );
 426    rgba[GCOMP] = UBYTE_TO_CHAN( src[1] );
 427    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 428    rgba[ACOMP] = UBYTE_TO_CHAN( src[3] );
 429 }
 430
 431 static void FETCH(bgr888)( const struct gl_texture_image *texImage,
 432                            GLint i, GLint j, GLint k, GLvoid *texel )
 433 {
 434    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 3 );
 435    GLchan *rgba = (GLchan *) texel;
 436    rgba[RCOMP] = UBYTE_TO_CHAN( src[2] );
 437    rgba[GCOMP] = UBYTE_TO_CHAN( src[1] );
 438    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 439    rgba[ACOMP] = CHAN_MAX;
 440 }
 441
 442 static void FETCH(bgr565)( const struct gl_texture_image *texImage,
 443                            GLint i, GLint j, GLint k, GLvoid *texel )
 444 {
 445    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 446    const GLushort s = *src;
 447    GLchan *rgba = (GLchan *) texel;
 448    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >> 8) & 0xf8) * 255 / 0xf8 );
 449    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >> 3) & 0xfc) * 255 / 0xfc );
 450    rgba[BCOMP] = UBYTE_TO_CHAN( ((s << 3) & 0xf8) * 255 / 0xf8 );
 451    rgba[ACOMP] = CHAN_MAX;
 452 }
 453
 454 static void FETCH(bgra4444)( const struct gl_texture_image *texImage,
 455                              GLint i, GLint j, GLint k, GLvoid *texel )
 456 {
 457    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 458    const GLushort s = *src;
 459    GLchan *rgba = (GLchan *) texel;
 460    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >>  8) & 0xf) * 255 / 0xf );
 461    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >>  4) & 0xf) * 255 / 0xf );
 462    rgba[BCOMP] = UBYTE_TO_CHAN( ((s      ) & 0xf) * 255 / 0xf );
 463    rgba[ACOMP] = UBYTE_TO_CHAN( ((s >> 12) & 0xf) * 255 / 0xf );
 464 }
 465
 466 static void FETCH(bgra5551)( const struct gl_texture_image *texImage,
 467                              GLint i, GLint j, GLint k, GLvoid *texel )
 468 {
 469    const GLushort *src = USHORT_SRC( texImage, i, j, k );
 470    const GLushort s = *src;
 471    GLchan *rgba = (GLchan *) texel;
 472    rgba[RCOMP] = UBYTE_TO_CHAN( ((s >> 10) & 0x1f) * 255 / 0x1f );
 473    rgba[GCOMP] = UBYTE_TO_CHAN( ((s >>  5) & 0x1f) * 255 / 0x1f );
 474    rgba[BCOMP] = UBYTE_TO_CHAN( ((s      ) & 0x1f) * 255 / 0x1f );
 475    rgba[ACOMP] = UBYTE_TO_CHAN( ((s >> 15) & 0x01) * 255 );
 476 }
 477
 478 static void FETCH(la88)( const struct gl_texture_image *texImage,
 479                          GLint i, GLint j, GLint k, GLvoid *texel )
 480 {
 481    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 2 );
 482    GLchan *rgba = (GLchan *) texel;
 483    rgba[RCOMP] = UBYTE_TO_CHAN( src[0] );
 484    rgba[GCOMP] = UBYTE_TO_CHAN( src[0] );
 485    rgba[BCOMP] = UBYTE_TO_CHAN( src[0] );
 486    rgba[ACOMP] = UBYTE_TO_CHAN( src[1] );
 487 }
 488
 489 static void FETCH(bgr233)( const struct gl_texture_image *texImage,
 490                            GLint i, GLint j, GLint k, GLvoid *texel )
 491 {
 492    const GLubyte *src = UBYTE_SRC( texImage, i, j, k, 1 );
 493    const GLubyte s = *src;
 494    GLchan *rgba = (GLchan *) texel;
 495    rgba[RCOMP] = UBYTE_TO_CHAN( ((s     ) & 0xe0) * 255 / 0xe0 );
 496    rgba[GCOMP] = UBYTE_TO_CHAN( ((s << 3) & 0xe0) * 255 / 0xe0 );
 497    rgba[BCOMP] = UBYTE_TO_CHAN( ((s << 5) & 0xc0) * 255 / 0xc0 );
 498    rgba[ACOMP] = CHAN_MAX;
 499 }
 500 #endif
 501
 502
 503 #undef CHAN_SRC
 504 #undef UBYTE_SRC
 505 #undef USHORT_SRC
 506 #undef FLOAT_SRC
 507 #undef FETCH
 508 #undef DIM