src/mesa/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:  4.0.3
   9  *
  10  * Copyright (C) 1999-2002  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 /** Stepping a GLfloat pointer by a byte stride */
 107 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 108 /** Stepping a GLuint pointer by a byte stride */
 109 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 110 /** Stepping a GLubyte[4] pointer by a byte stride */
 111 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 112 /** Stepping a GLchan[4] pointer by a byte stride */
 113 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
 114 /** Stepping a GLchan pointer by a byte stride */
 115 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
 116 /** Stepping a \p t pointer by a byte stride */
 117 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 118
 119
 120 /**********************************************************************/
 121 /** \name 4-element vector operations */
 122 /*@{*/
 123
 124 /** Zero */
 125 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 126
 127 /** Test for equality */
 128 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 129               (a)[1] == (b)[1] &&   \
 130               (a)[2] == (b)[2] &&   \
 131               (a)[3] == (b)[3])
 132
 133 /** Test for equality (unsigned bytes) */
 134 #if defined(__i386__)
 135 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 136 #else
 137 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 138 #endif
 139
 140 /** Copy a 4-element vector */
 141 #define COPY_4V( DST, SRC )         \
 142 do {                                \
 143    (DST)[0] = (SRC)[0];             \
 144    (DST)[1] = (SRC)[1];             \
 145    (DST)[2] = (SRC)[2];             \
 146    (DST)[3] = (SRC)[3];             \
 147 } while (0)
 148
 149 /** Copy a 4-element vector with cast */
 150 #define COPY_4V_CAST( DST, SRC, CAST )  \
 151 do {                                    \
 152    (DST)[0] = (CAST)(SRC)[0];           \
 153    (DST)[1] = (CAST)(SRC)[1];           \
 154    (DST)[2] = (CAST)(SRC)[2];           \
 155    (DST)[3] = (CAST)(SRC)[3];           \
 156 } while (0)
 157
 158 /** Copy a 4-element unsigned byte vector */
 159 #if defined(__i386__)
 160 #define COPY_4UBV(DST, SRC)         \
 161 do {                                \
 162    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 163 } while (0)
 164 #else
 165 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 166 #define COPY_4UBV(DST, SRC)         \
 167 do {                                \
 168    (DST)[0] = (SRC)[0];             \
 169    (DST)[1] = (SRC)[1];             \
 170    (DST)[2] = (SRC)[2];             \
 171    (DST)[3] = (SRC)[3];             \
 172 } while (0)
 173 #endif
 174
 175 /** Copy a 4-element float vector (Use COPY_FLOAT to avoid loading FPU) */
 176 #define COPY_4FV( DST, SRC )        \
 177 do {                                \
 178    COPY_FLOAT((DST)[0], (SRC)[0]);  \
 179    COPY_FLOAT((DST)[1], (SRC)[1]);  \
 180    COPY_FLOAT((DST)[2], (SRC)[2]);  \
 181    COPY_FLOAT((DST)[3], (SRC)[3]);  \
 182 } while (0)
 183
 184
 185 /** Copy \p SZ elements into a 4-element vector */
 186 #define COPY_SZ_4V(DST, SZ, SRC)        \
 187 do {                        \
 188    switch (SZ) {                \
 189    case 4: (DST)[3] = (SRC)[3];         \
 190    case 3: (DST)[2] = (SRC)[2];         \
 191    case 2: (DST)[1] = (SRC)[1];         \
 192    case 1: (DST)[0] = (SRC)[0];         \
 193    }                        \
 194 } while(0)
 195
 196 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 197  * default values to the remaining */
 198 #define COPY_CLEAN_4V(DST, SZ, SRC)         \
 199 do {                        \
 200       ASSIGN_4V( DST, 0, 0, 0, 1 );     \
 201       COPY_SZ_4V( DST, SZ, SRC );       \
 202 } while (0)
 203
 204 /** Subtraction */
 205 #define SUB_4V( DST, SRCA, SRCB )       \
 206 do {                        \
 207       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 208       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 209       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 210       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
 211 } while (0)
 212
 213 /** Addition */
 214 #define ADD_4V( DST, SRCA, SRCB )       \
 215 do {                        \
 216       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 217       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 218       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 219       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 220 } while (0)
 221
 222 /** Element-wise multiplication */
 223 #define SCALE_4V( DST, SRCA, SRCB )     \
 224 do {                        \
 225       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 226       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 227       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 228       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 229 } while (0)
 230
 231 /** In-place addition */
 232 #define ACC_4V( DST, SRC )          \
 233 do {                        \
 234       (DST)[0] += (SRC)[0];         \
 235       (DST)[1] += (SRC)[1];         \
 236       (DST)[2] += (SRC)[2];         \
 237       (DST)[3] += (SRC)[3];         \
 238 } while (0)
 239
 240 /** Element-wise multiplication and addition */
 241 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 242 do {                        \
 243       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 244       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 245       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 246       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 247 } while (0)
 248
 249 /** In-place scalar multiplication and addition */
 250 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 251 do {                        \
 252       (DST)[0] += S * (SRCB)[0];        \
 253       (DST)[1] += S * (SRCB)[1];        \
 254       (DST)[2] += S * (SRCB)[2];        \
 255       (DST)[3] += S * (SRCB)[3];        \
 256 } while (0)
 257
 258 /** Scalar multiplication */
 259 #define SCALE_SCALAR_4V( DST, S, SRCB )     \
 260 do {                        \
 261       (DST)[0] = S * (SRCB)[0];         \
 262       (DST)[1] = S * (SRCB)[1];         \
 263       (DST)[2] = S * (SRCB)[2];         \
 264       (DST)[3] = S * (SRCB)[3];         \
 265 } while (0)
 266
 267 /** In-place scalar multiplication */
 268 #define SELF_SCALE_SCALAR_4V( DST, S )      \
 269 do {                        \
 270       (DST)[0] *= S;                \
 271       (DST)[1] *= S;                \
 272       (DST)[2] *= S;                \
 273       (DST)[3] *= S;                \
 274 } while (0)
 275
 276 /** Assignment */
 277 #define ASSIGN_4V( V, V0, V1, V2, V3 )      \
 278 do {                        \
 279     V[0] = V0;                  \
 280     V[1] = V1;                  \
 281     V[2] = V2;                  \
 282     V[3] = V3;                  \
 283 } while(0)
 284
 285 /*@}*/
 286
 287
 288 /**********************************************************************/
 289 /** \name 3-element vector operations*/
 290 /*@{*/
 291
 292 /** Zero */
 293 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 294
 295 /** Test for equality */
 296 #define TEST_EQ_3V(a,b)  ((a)[0] == (b)[0] &&   \
 297               (a)[1] == (b)[1] &&   \
 298               (a)[2] == (b)[2])
 299
 300 /** Copy a 3-element vector */
 301 #define COPY_3V( DST, SRC )         \
 302 do {                        \
 303    (DST)[0] = (SRC)[0];             \
 304    (DST)[1] = (SRC)[1];             \
 305    (DST)[2] = (SRC)[2];             \
 306 } while (0)
 307
 308 /** Copy a 3-element vector with cast */
 309 #define COPY_3V_CAST( DST, SRC, CAST )      \
 310 do {                        \
 311    (DST)[0] = (CAST)(SRC)[0];           \
 312    (DST)[1] = (CAST)(SRC)[1];           \
 313    (DST)[2] = (CAST)(SRC)[2];           \
 314 } while (0)
 315
 316 /** Copy a 3-element float vector */
 317 #define COPY_3FV( DST, SRC )            \
 318 do {                        \
 319    const GLfloat *_tmp = (SRC);         \
 320    (DST)[0] = _tmp[0];              \
 321    (DST)[1] = _tmp[1];              \
 322    (DST)[2] = _tmp[2];              \
 323 } while (0)
 324
 325 /** Subtraction */
 326 #define SUB_3V( DST, SRCA, SRCB )       \
 327 do {                        \
 328       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 329       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 330       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 331 } while (0)
 332
 333 /** Addition */
 334 #define ADD_3V( DST, SRCA, SRCB )       \
 335 do {                        \
 336       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 337       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 338       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 339 } while (0)
 340
 341 /** In-place scalar multiplication */
 342 #define SCALE_3V( DST, SRCA, SRCB )     \
 343 do {                        \
 344       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 345       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 346       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 347 } while (0)
 348
 349 /** In-place element-wise multiplication */
 350 #define SELF_SCALE_3V( DST, SRC )       \
 351 do {                        \
 352       (DST)[0] *= (SRC)[0];         \
 353       (DST)[1] *= (SRC)[1];         \
 354       (DST)[2] *= (SRC)[2];         \
 355 } while (0)
 356
 357 /** In-place addition */
 358 #define ACC_3V( DST, SRC )          \
 359 do {                        \
 360       (DST)[0] += (SRC)[0];         \
 361       (DST)[1] += (SRC)[1];         \
 362       (DST)[2] += (SRC)[2];         \
 363 } while (0)
 364
 365 /** Element-wise multiplication and addition */
 366 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 367 do {                        \
 368       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 369       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 370       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 371 } while (0)
 372
 373 /** Scalar multiplication */
 374 #define SCALE_SCALAR_3V( DST, S, SRCB )     \
 375 do {                        \
 376       (DST)[0] = S * (SRCB)[0];         \
 377       (DST)[1] = S * (SRCB)[1];         \
 378       (DST)[2] = S * (SRCB)[2];         \
 379 } while (0)
 380
 381 /** In-place scalar multiplication and addition */
 382 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 383 do {                        \
 384       (DST)[0] += S * (SRCB)[0];        \
 385       (DST)[1] += S * (SRCB)[1];        \
 386       (DST)[2] += S * (SRCB)[2];        \
 387 } while (0)
 388
 389 /** In-place scalar multiplication */
 390 #define SELF_SCALE_SCALAR_3V( DST, S )      \
 391 do {                        \
 392       (DST)[0] *= S;                \
 393       (DST)[1] *= S;                \
 394       (DST)[2] *= S;                \
 395 } while (0)
 396
 397 /** In-place scalar addition */
 398 #define ACC_SCALAR_3V( DST, S )         \
 399 do {                        \
 400       (DST)[0] += S;                \
 401       (DST)[1] += S;                \
 402       (DST)[2] += S;                \
 403 } while (0)
 404
 405 /** Assignment */
 406 #define ASSIGN_3V( V, V0, V1, V2 )  \
 407 do {                    \
 408     V[0] = V0;              \
 409     V[1] = V1;              \
 410     V[2] = V2;              \
 411 } while(0)
 412
 413 /*@}*/
 414
 415
 416 /**********************************************************************/
 417 /** \name 2-element vector operations*/
 418 /*@{*/
 419
 420 /** Zero */
 421 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 422
 423 /** Copy a 2-element vector */
 424 #define COPY_2V( DST, SRC )         \
 425 do {                        \
 426    (DST)[0] = (SRC)[0];             \
 427    (DST)[1] = (SRC)[1];             \
 428 } while (0)
 429
 430 /** Copy a 2-element vector with cast */
 431 #define COPY_2V_CAST( DST, SRC, CAST )      \
 432 do {                        \
 433    (DST)[0] = (CAST)(SRC)[0];           \
 434    (DST)[1] = (CAST)(SRC)[1];           \
 435 } while (0)
 436
 437 /** Copy a 2-element float vector */
 438 #define COPY_2FV( DST, SRC )            \
 439 do {                        \
 440    const GLfloat *_tmp = (SRC);         \
 441    (DST)[0] = _tmp[0];              \
 442    (DST)[1] = _tmp[1];              \
 443 } while (0)
 444
 445 /** Subtraction */
 446 #define SUB_2V( DST, SRCA, SRCB )       \
 447 do {                        \
 448       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 449       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 450 } while (0)
 451
 452 /** Addition */
 453 #define ADD_2V( DST, SRCA, SRCB )       \
 454 do {                        \
 455       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 456       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 457 } while (0)
 458
 459 /** In-place scalar multiplication */
 460 #define SCALE_2V( DST, SRCA, SRCB )     \
 461 do {                        \
 462       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 463       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 464 } while (0)
 465
 466 /** In-place addition */
 467 #define ACC_2V( DST, SRC )          \
 468 do {                        \
 469       (DST)[0] += (SRC)[0];         \
 470       (DST)[1] += (SRC)[1];         \
 471 } while (0)
 472
 473 /** Element-wise multiplication and addition */
 474 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 475 do {                        \
 476       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 477       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 478 } while (0)
 479
 480 /** Scalar multiplication */
 481 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 482 do {                        \
 483       (DST)[0] = S * (SRCB)[0];         \
 484       (DST)[1] = S * (SRCB)[1];         \
 485 } while (0)
 486
 487 /** In-place scalar multiplication and addition */
 488 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 489 do {                        \
 490       (DST)[0] += S * (SRCB)[0];        \
 491       (DST)[1] += S * (SRCB)[1];        \
 492 } while (0)
 493
 494 /** In-place scalar multiplication */
 495 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 496 do {                        \
 497       (DST)[0] *= S;                \
 498       (DST)[1] *= S;                \
 499 } while (0)
 500
 501 /** In-place scalar addition */
 502 #define ACC_SCALAR_2V( DST, S )         \
 503 do {                        \
 504       (DST)[0] += S;                \
 505       (DST)[1] += S;                \
 506 } while (0)
 507
 508
 509
 510 /**
 511  * Linear interpolation
 512  *
 513  * \note \p OUT argument is evaluated twice!
 514  * \note Be wary of using *coord++ as an argument to any of these macros!
 515  */
 516 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 517
 518 /* Can do better with integer math
 519  */
 520 #define INTERP_UB( t, dstub, outub, inub )  \
 521 do {                        \
 522    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
 523    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
 524    GLfloat dstf = LINTERP( t, outf, inf );  \
 525    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
 526 } while (0)
 527
 528 #define INTERP_CHAN( t, dstc, outc, inc )   \
 529 do {                        \
 530    GLfloat inf = CHAN_TO_FLOAT( inc );      \
 531    GLfloat outf = CHAN_TO_FLOAT( outc );    \
 532    GLfloat dstf = LINTERP( t, outf, inf );  \
 533    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
 534 } while (0)
 535
 536 #define INTERP_UI( t, dstui, outui, inui )  \
 537    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
 538
 539 #define INTERP_F( t, dstf, outf, inf )      \
 540    dstf = LINTERP( t, outf, inf )
 541
 542 #define INTERP_4F( t, dst, out, in )        \
 543 do {                        \
 544    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 545    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 546    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 547    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 548 } while (0)
 549
 550 #define INTERP_3F( t, dst, out, in )        \
 551 do {                        \
 552    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 553    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 554    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 555 } while (0)
 556
 557 #define INTERP_4CHAN( t, dst, out, in )         \
 558 do {                            \
 559    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 560    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 561    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 562    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
 563 } while (0)
 564
 565 #define INTERP_3CHAN( t, dst, out, in )         \
 566 do {                            \
 567    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 568    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 569    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 570 } while (0)
 571
 572 #define INTERP_SZ( t, vec, to, out, in, sz )                \
 573 do {                                    \
 574    switch (sz) {                            \
 575    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
 576    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
 577    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
 578    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
 579    }                                    \
 580 } while(0)
 581
 582
 583
 584 /** Assign scalers to short vectors */
 585 #define ASSIGN_2V( V, V0, V1 )  \
 586 do {                \
 587     V[0] = V0;          \
 588     V[1] = V1;          \
 589 } while(0)
 590
 591 /*@}*/
 592
 593
 594
 595 /** Clamp X to [MIN,MAX] */
 596 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 597
 598 /** Assign X to CLAMP(X, MIN, MAX) */
 599 #define CLAMP_SELF(x, mn, mx)  \
 600    ( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
 601
 602
 603
 604 /** Minimum of two values: */
 605 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 606
 607 /** Maximum of two values: */
 608 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 609
 610 /** Dot product of two 2-element vectors */
 611 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 612
 613 /** Dot product of two 3-element vectors */
 614 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 615
 616 /** Dot product of two 4-element vectors */
 617 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 618             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 619
 620 /** Dot product of two 4-element vectors */
 621 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
 622
 623
 624 /** Cross product of two 3-element vectors */
 625 #define CROSS3(n, u, v)             \
 626 do {                        \
 627    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 628    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 629    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 630 } while (0)
 631
 632
 633 /* Normalize a 3-element vector to unit length. */
 634 #define NORMALIZE_3FV( V )          \
 635 do {                        \
 636    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 637    if (len) {                   \
 638       len = INV_SQRTF(len);         \
 639       (V)[0] = (GLfloat) ((V)[0] * len);    \
 640       (V)[1] = (GLfloat) ((V)[1] * len);    \
 641       (V)[2] = (GLfloat) ((V)[2] * len);    \
 642    }                        \
 643 } while(0)
 644
 645 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 646 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 647
 648 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 649 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 650
 651
 652 /*@}*/
 653
 654
 655 #endif