reactos/lib/mesa32/src/main/macros.h

   1 /**
   2  * \file macros.h
   3  * A collection of useful macros.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  6.0
   9  *
  10  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included
  20  * in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  26  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  27  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #ifndef MACROS_H
  32 #define MACROS_H
  33
  34 #include "imports.h"
  35
  36
  37 /**
  38  * \name Integer / float conversion for colors, normals, etc.
  39  */
  40 /*@{*/
  41
  42 /** Convert GLubyte in [0,255] to GLfloat in [0.0,1.0] */
  43 extern GLfloat _mesa_ubyte_to_float_color_tab[256];
  44 #define UBYTE_TO_FLOAT(u) _mesa_ubyte_to_float_color_tab[(unsigned int)(u)]
  45
  46 /** Convert GLfloat in [0.0,1.0] to GLubyte in [0,255] */
  47 #define FLOAT_TO_UBYTE(X)   ((GLubyte) (GLint) ((X) * 255.0F))
  48
  49
  50 /** Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0] */
  51 #define BYTE_TO_FLOAT(B)    ((2.0F * (B) + 1.0F) * (1.0F/255.0F))
  52
  53 /** Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127] */
  54 #define FLOAT_TO_BYTE(X)    ( (((GLint) (255.0F * (X))) - 1) / 2 )
  55
  56
  57 /** Convert GLushort in [0,65536] to GLfloat in [0.0,1.0] */
  58 #define USHORT_TO_FLOAT(S)  ((GLfloat) (S) * (1.0F / 65535.0F))
  59
  60 /** Convert GLfloat in [0.0,1.0] to GLushort in [0,65536] */
  61 #define FLOAT_TO_USHORT(X)  ((GLushort) (GLint) ((X) * 65535.0F))
  62
  63 /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
  64 #define SHORT_TO_FLOAT(S)   ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
  65
  66 /** Convert GLfloat in [0.0,1.0] to GLshort in [-32768,32767] */
  67 #define FLOAT_TO_SHORT(X)   ( (((GLint) (65535.0F * (X))) - 1) / 2 )
  68
  69
  70 /** Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
  71 #define UINT_TO_FLOAT(U)    ((GLfloat) (U) * (1.0F / 4294967295.0F))
  72
  73 /** Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
  74 #define FLOAT_TO_UINT(X)    ((GLuint) ((X) * 4294967295.0))
  75
  76
  77 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
  78 #define INT_TO_FLOAT(I)     ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0F))
  79
  80 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
  81 /* causes overflow:
  82 #define FLOAT_TO_INT(X)     ( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
  83 */
  84 /* a close approximation: */
  85 #define FLOAT_TO_INT(X)     ( (GLint) (2147483647.0 * (X)) )
  86
  87
  88 #define BYTE_TO_UBYTE(b)   ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b)))
  89 #define SHORT_TO_UBYTE(s)  ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7)))
  90 #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8))
  91 #define INT_TO_UBYTE(i)    ((GLubyte) ((i) < 0 ? 0 : (GLubyte) ((i) >> 23)))
  92 #define UINT_TO_UBYTE(i)   ((GLubyte) ((i) >> 24))
  93
  94
  95 #define BYTE_TO_USHORT(b)  ((b) < 0 ? 0 : ((GLushort) (((b) * 65535) / 255)))
  96 #define UBYTE_TO_USHORT(b) (((GLushort) (b) << 8) | (GLushort) (b))
  97 #define SHORT_TO_USHORT(s) ((s) < 0 ? 0 : ((GLushort) (((s) * 65535 / 32767))))
  98 #define INT_TO_USHORT(i)   ((i) < 0 ? 0 : ((GLushort) ((i) >> 15)))
  99 #define UINT_TO_USHORT(i)  ((i) < 0 ? 0 : ((GLushort) ((i) >> 16)))
 100 #define UNCLAMPED_FLOAT_TO_USHORT(us, f)  \
 101         us = ( (GLushort) IROUND( CLAMP((f), 0.0, 1.0) * 65535.0F) )
 102 #define CLAMPED_FLOAT_TO_USHORT(us, f)  \
 103         us = ( (GLushort) IROUND( (f) * 65535.0F) )
 104
 105 /*@}*/
 106
 107
 108 /** Stepping a GLfloat pointer by a byte stride */
 109 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 110 /** Stepping a GLuint pointer by a byte stride */
 111 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 112 /** Stepping a GLubyte[4] pointer by a byte stride */
 113 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 114 /** Stepping a GLfloat[4] pointer by a byte stride */
 115 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
 116 /** Stepping a GLchan[4] pointer by a byte stride */
 117 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
 118 /** Stepping a GLchan pointer by a byte stride */
 119 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
 120 /** Stepping a \p t pointer by a byte stride */
 121 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 122
 123
 124 /**********************************************************************/
 125 /** \name 4-element vector operations */
 126 /*@{*/
 127
 128 /** Zero */
 129 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 130
 131 /** Test for equality */
 132 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 133               (a)[1] == (b)[1] &&   \
 134               (a)[2] == (b)[2] &&   \
 135               (a)[3] == (b)[3])
 136
 137 /** Test for equality (unsigned bytes) */
 138 #if defined(__i386__)
 139 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 140 #else
 141 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 142 #endif
 143
 144 /** Copy a 4-element vector */
 145 #define COPY_4V( DST, SRC )         \
 146 do {                                \
 147    (DST)[0] = (SRC)[0];             \
 148    (DST)[1] = (SRC)[1];             \
 149    (DST)[2] = (SRC)[2];             \
 150    (DST)[3] = (SRC)[3];             \
 151 } while (0)
 152
 153 /** Copy a 4-element vector with cast */
 154 #define COPY_4V_CAST( DST, SRC, CAST )  \
 155 do {                                    \
 156    (DST)[0] = (CAST)(SRC)[0];           \
 157    (DST)[1] = (CAST)(SRC)[1];           \
 158    (DST)[2] = (CAST)(SRC)[2];           \
 159    (DST)[3] = (CAST)(SRC)[3];           \
 160 } while (0)
 161
 162 /** Copy a 4-element unsigned byte vector */
 163 #if defined(__i386__)
 164 #define COPY_4UBV(DST, SRC)                 \
 165 do {                                        \
 166    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 167 } while (0)
 168 #else
 169 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 170 #define COPY_4UBV(DST, SRC)         \
 171 do {                                \
 172    (DST)[0] = (SRC)[0];             \
 173    (DST)[1] = (SRC)[1];             \
 174    (DST)[2] = (SRC)[2];             \
 175    (DST)[3] = (SRC)[3];             \
 176 } while (0)
 177 #endif
 178
 179 /** Copy a 4-element float vector (Use COPY_FLOAT to avoid loading FPU) */
 180 #define COPY_4FV( DST, SRC )        \
 181 do {                                \
 182    COPY_FLOAT((DST)[0], (SRC)[0]);  \
 183    COPY_FLOAT((DST)[1], (SRC)[1]);  \
 184    COPY_FLOAT((DST)[2], (SRC)[2]);  \
 185    COPY_FLOAT((DST)[3], (SRC)[3]);  \
 186 } while (0)
 187
 188
 189 /** Copy \p SZ elements into a 4-element vector */
 190 #define COPY_SZ_4V(DST, SZ, SRC)  \
 191 do {                              \
 192    switch (SZ) {                  \
 193    case 4: (DST)[3] = (SRC)[3];   \
 194    case 3: (DST)[2] = (SRC)[2];   \
 195    case 2: (DST)[1] = (SRC)[1];   \
 196    case 1: (DST)[0] = (SRC)[0];   \
 197    }                              \
 198 } while(0)
 199
 200 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 201  * default values to the remaining */
 202 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
 203 do {                                 \
 204       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
 205       COPY_SZ_4V( DST, SZ, SRC );    \
 206 } while (0)
 207
 208 /** Subtraction */
 209 #define SUB_4V( DST, SRCA, SRCB )           \
 210 do {                                        \
 211       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 212       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 213       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 214       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
 215 } while (0)
 216
 217 /** Addition */
 218 #define ADD_4V( DST, SRCA, SRCB )           \
 219 do {                                        \
 220       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 221       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 222       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 223       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 224 } while (0)
 225
 226 /** Element-wise multiplication */
 227 #define SCALE_4V( DST, SRCA, SRCB )         \
 228 do {                                        \
 229       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 230       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 231       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 232       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 233 } while (0)
 234
 235 /** In-place addition */
 236 #define ACC_4V( DST, SRC )          \
 237 do {                                \
 238       (DST)[0] += (SRC)[0];         \
 239       (DST)[1] += (SRC)[1];         \
 240       (DST)[2] += (SRC)[2];         \
 241       (DST)[3] += (SRC)[3];         \
 242 } while (0)
 243
 244 /** Element-wise multiplication and addition */
 245 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 246 do {                                        \
 247       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 248       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 249       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 250       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 251 } while (0)
 252
 253 /** In-place scalar multiplication and addition */
 254 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 255 do {                                        \
 256       (DST)[0] += S * (SRCB)[0];            \
 257       (DST)[1] += S * (SRCB)[1];            \
 258       (DST)[2] += S * (SRCB)[2];            \
 259       (DST)[3] += S * (SRCB)[3];            \
 260 } while (0)
 261
 262 /** Scalar multiplication */
 263 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
 264 do {                                    \
 265       (DST)[0] = S * (SRCB)[0];         \
 266       (DST)[1] = S * (SRCB)[1];         \
 267       (DST)[2] = S * (SRCB)[2];         \
 268       (DST)[3] = S * (SRCB)[3];         \
 269 } while (0)
 270
 271 /** In-place scalar multiplication */
 272 #define SELF_SCALE_SCALAR_4V( DST, S ) \
 273 do {                                   \
 274       (DST)[0] *= S;                   \
 275       (DST)[1] *= S;                   \
 276       (DST)[2] *= S;                   \
 277       (DST)[3] *= S;                   \
 278 } while (0)
 279
 280 /** Assignment */
 281 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
 282 do {                                    \
 283     V[0] = V0;                          \
 284     V[1] = V1;                          \
 285     V[2] = V2;                          \
 286     V[3] = V3;                          \
 287 } while(0)
 288
 289 /*@}*/
 290
 291
 292 /**********************************************************************/
 293 /** \name 3-element vector operations*/
 294 /*@{*/
 295
 296 /** Zero */
 297 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 298
 299 /** Test for equality */
 300 #define TEST_EQ_3V(a,b)  \
 301    ((a)[0] == (b)[0] &&  \
 302     (a)[1] == (b)[1] &&  \
 303     (a)[2] == (b)[2])
 304
 305 /** Copy a 3-element vector */
 306 #define COPY_3V( DST, SRC )         \
 307 do {                                \
 308    (DST)[0] = (SRC)[0];             \
 309    (DST)[1] = (SRC)[1];             \
 310    (DST)[2] = (SRC)[2];             \
 311 } while (0)
 312
 313 /** Copy a 3-element vector with cast */
 314 #define COPY_3V_CAST( DST, SRC, CAST )  \
 315 do {                                    \
 316    (DST)[0] = (CAST)(SRC)[0];           \
 317    (DST)[1] = (CAST)(SRC)[1];           \
 318    (DST)[2] = (CAST)(SRC)[2];           \
 319 } while (0)
 320
 321 /** Copy a 3-element float vector */
 322 #define COPY_3FV( DST, SRC )        \
 323 do {                                \
 324    const GLfloat *_tmp = (SRC);     \
 325    (DST)[0] = _tmp[0];              \
 326    (DST)[1] = _tmp[1];              \
 327    (DST)[2] = _tmp[2];              \
 328 } while (0)
 329
 330 /** Subtraction */
 331 #define SUB_3V( DST, SRCA, SRCB )        \
 332 do {                                     \
 333       (DST)[0] = (SRCA)[0] - (SRCB)[0];  \
 334       (DST)[1] = (SRCA)[1] - (SRCB)[1];  \
 335       (DST)[2] = (SRCA)[2] - (SRCB)[2];  \
 336 } while (0)
 337
 338 /** Addition */
 339 #define ADD_3V( DST, SRCA, SRCB )       \
 340 do {                                    \
 341       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
 342       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
 343       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
 344 } while (0)
 345
 346 /** In-place scalar multiplication */
 347 #define SCALE_3V( DST, SRCA, SRCB )     \
 348 do {                                    \
 349       (DST)[0] = (SRCA)[0] * (SRCB)[0]; \
 350       (DST)[1] = (SRCA)[1] * (SRCB)[1]; \
 351       (DST)[2] = (SRCA)[2] * (SRCB)[2]; \
 352 } while (0)
 353
 354 /** In-place element-wise multiplication */
 355 #define SELF_SCALE_3V( DST, SRC )   \
 356 do {                                \
 357       (DST)[0] *= (SRC)[0];         \
 358       (DST)[1] *= (SRC)[1];         \
 359       (DST)[2] *= (SRC)[2];         \
 360 } while (0)
 361
 362 /** In-place addition */
 363 #define ACC_3V( DST, SRC )          \
 364 do {                                \
 365       (DST)[0] += (SRC)[0];         \
 366       (DST)[1] += (SRC)[1];         \
 367       (DST)[2] += (SRC)[2];         \
 368 } while (0)
 369
 370 /** Element-wise multiplication and addition */
 371 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 372 do {                                        \
 373       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 374       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 375       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 376 } while (0)
 377
 378 /** Scalar multiplication */
 379 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
 380 do {                                    \
 381       (DST)[0] = S * (SRCB)[0];         \
 382       (DST)[1] = S * (SRCB)[1];         \
 383       (DST)[2] = S * (SRCB)[2];         \
 384 } while (0)
 385
 386 /** In-place scalar multiplication and addition */
 387 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 388 do {                                        \
 389       (DST)[0] += S * (SRCB)[0];            \
 390       (DST)[1] += S * (SRCB)[1];            \
 391       (DST)[2] += S * (SRCB)[2];            \
 392 } while (0)
 393
 394 /** In-place scalar multiplication */
 395 #define SELF_SCALE_SCALAR_3V( DST, S ) \
 396 do {                                   \
 397       (DST)[0] *= S;                   \
 398       (DST)[1] *= S;                   \
 399       (DST)[2] *= S;                   \
 400 } while (0)
 401
 402 /** In-place scalar addition */
 403 #define ACC_SCALAR_3V( DST, S )     \
 404 do {                                \
 405       (DST)[0] += S;                \
 406       (DST)[1] += S;                \
 407       (DST)[2] += S;                \
 408 } while (0)
 409
 410 /** Assignment */
 411 #define ASSIGN_3V( V, V0, V1, V2 )  \
 412 do {                                \
 413     V[0] = V0;                      \
 414     V[1] = V1;                      \
 415     V[2] = V2;                      \
 416 } while(0)
 417
 418 /*@}*/
 419
 420
 421 /**********************************************************************/
 422 /** \name 2-element vector operations*/
 423 /*@{*/
 424
 425 /** Zero */
 426 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 427
 428 /** Copy a 2-element vector */
 429 #define COPY_2V( DST, SRC )         \
 430 do {                        \
 431    (DST)[0] = (SRC)[0];             \
 432    (DST)[1] = (SRC)[1];             \
 433 } while (0)
 434
 435 /** Copy a 2-element vector with cast */
 436 #define COPY_2V_CAST( DST, SRC, CAST )      \
 437 do {                        \
 438    (DST)[0] = (CAST)(SRC)[0];           \
 439    (DST)[1] = (CAST)(SRC)[1];           \
 440 } while (0)
 441
 442 /** Copy a 2-element float vector */
 443 #define COPY_2FV( DST, SRC )            \
 444 do {                        \
 445    const GLfloat *_tmp = (SRC);         \
 446    (DST)[0] = _tmp[0];              \
 447    (DST)[1] = _tmp[1];              \
 448 } while (0)
 449
 450 /** Subtraction */
 451 #define SUB_2V( DST, SRCA, SRCB )       \
 452 do {                        \
 453       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 454       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 455 } while (0)
 456
 457 /** Addition */
 458 #define ADD_2V( DST, SRCA, SRCB )       \
 459 do {                        \
 460       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 461       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 462 } while (0)
 463
 464 /** In-place scalar multiplication */
 465 #define SCALE_2V( DST, SRCA, SRCB )     \
 466 do {                        \
 467       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 468       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 469 } while (0)
 470
 471 /** In-place addition */
 472 #define ACC_2V( DST, SRC )          \
 473 do {                        \
 474       (DST)[0] += (SRC)[0];         \
 475       (DST)[1] += (SRC)[1];         \
 476 } while (0)
 477
 478 /** Element-wise multiplication and addition */
 479 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 480 do {                        \
 481       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 482       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 483 } while (0)
 484
 485 /** Scalar multiplication */
 486 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 487 do {                        \
 488       (DST)[0] = S * (SRCB)[0];         \
 489       (DST)[1] = S * (SRCB)[1];         \
 490 } while (0)
 491
 492 /** In-place scalar multiplication and addition */
 493 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 494 do {                        \
 495       (DST)[0] += S * (SRCB)[0];        \
 496       (DST)[1] += S * (SRCB)[1];        \
 497 } while (0)
 498
 499 /** In-place scalar multiplication */
 500 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 501 do {                        \
 502       (DST)[0] *= S;                \
 503       (DST)[1] *= S;                \
 504 } while (0)
 505
 506 /** In-place scalar addition */
 507 #define ACC_SCALAR_2V( DST, S )         \
 508 do {                        \
 509       (DST)[0] += S;                \
 510       (DST)[1] += S;                \
 511 } while (0)
 512
 513
 514
 515 /**
 516  * Linear interpolation
 517  *
 518  * \note \p OUT argument is evaluated twice!
 519  * \note Be wary of using *coord++ as an argument to any of these macros!
 520  */
 521 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 522
 523 /* Can do better with integer math
 524  */
 525 #define INTERP_UB( t, dstub, outub, inub )  \
 526 do {                        \
 527    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
 528    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
 529    GLfloat dstf = LINTERP( t, outf, inf );  \
 530    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
 531 } while (0)
 532
 533 #define INTERP_CHAN( t, dstc, outc, inc )   \
 534 do {                        \
 535    GLfloat inf = CHAN_TO_FLOAT( inc );      \
 536    GLfloat outf = CHAN_TO_FLOAT( outc );    \
 537    GLfloat dstf = LINTERP( t, outf, inf );  \
 538    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
 539 } while (0)
 540
 541 #define INTERP_UI( t, dstui, outui, inui )  \
 542    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
 543
 544 #define INTERP_F( t, dstf, outf, inf )      \
 545    dstf = LINTERP( t, outf, inf )
 546
 547 #define INTERP_4F( t, dst, out, in )        \
 548 do {                        \
 549    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 550    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 551    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 552    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 553 } while (0)
 554
 555 #define INTERP_3F( t, dst, out, in )        \
 556 do {                        \
 557    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 558    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 559    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 560 } while (0)
 561
 562 #define INTERP_4CHAN( t, dst, out, in )         \
 563 do {                            \
 564    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 565    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 566    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 567    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
 568 } while (0)
 569
 570 #define INTERP_3CHAN( t, dst, out, in )         \
 571 do {                            \
 572    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 573    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 574    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 575 } while (0)
 576
 577 #define INTERP_SZ( t, vec, to, out, in, sz )                \
 578 do {                                    \
 579    switch (sz) {                            \
 580    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
 581    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
 582    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
 583    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
 584    }                                    \
 585 } while(0)
 586
 587
 588
 589 /** Assign scalers to short vectors */
 590 #define ASSIGN_2V( V, V0, V1 )  \
 591 do {                \
 592     V[0] = V0;          \
 593     V[1] = V1;          \
 594 } while(0)
 595
 596 /*@}*/
 597
 598
 599
 600 /** Clamp X to [MIN,MAX] */
 601 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 602
 603 /** Assign X to CLAMP(X, MIN, MAX) */
 604 #define CLAMP_SELF(x, mn, mx)  \
 605    ( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
 606
 607
 608
 609 /** Minimum of two values: */
 610 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 611
 612 /** Maximum of two values: */
 613 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 614
 615 /** Dot product of two 2-element vectors */
 616 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 617
 618 /** Dot product of two 3-element vectors */
 619 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 620
 621 /** Dot product of two 4-element vectors */
 622 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 623             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 624
 625 /** Dot product of two 4-element vectors */
 626 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
 627
 628
 629 /** Cross product of two 3-element vectors */
 630 #define CROSS3(n, u, v)             \
 631 do {                        \
 632    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 633    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 634    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 635 } while (0)
 636
 637
 638 /* Normalize a 3-element vector to unit length. */
 639 #define NORMALIZE_3FV( V )          \
 640 do {                        \
 641    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 642    if (len) {                   \
 643       len = INV_SQRTF(len);         \
 644       (V)[0] = (GLfloat) ((V)[0] * len);    \
 645       (V)[1] = (GLfloat) ((V)[1] * len);    \
 646       (V)[2] = (GLfloat) ((V)[2] * len);    \
 647    }                        \
 648 } while(0)
 649
 650 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 651 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 652
 653 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 654 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 655
 656
 657 #endif