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:  6.5.2
   9  *
  10  * Copyright (C) 1999-2006  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 GLbyte in [-128,127] to GLfloat in [-1.0,1.0], texture/fb data */
  58 #define BYTE_TO_FLOAT_TEX(B)    ((B) == -128 ? -1.0F : (B) * (1.0F/127.0F))
  59
  60 /** Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127], texture/fb data */
  61 #define FLOAT_TO_BYTE_TEX(X)    ( (GLint) (127.0F * (X)) )
  62
  63
  64 /** Convert GLushort in [0,65535] to GLfloat in [0.0,1.0] */
  65 #define USHORT_TO_FLOAT(S)  ((GLfloat) (S) * (1.0F / 65535.0F))
  66
  67 /** Convert GLfloat in [0.0,1.0] to GLushort in [0, 65535] */
  68 #define FLOAT_TO_USHORT(X)   ((GLuint) ((X) * 65535.0F))
  69
  70
  71 /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
  72 #define SHORT_TO_FLOAT(S)   ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
  73
  74 /** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767] */
  75 #define FLOAT_TO_SHORT(X)   ( (((GLint) (65535.0F * (X))) - 1) / 2 )
  76
  77
  78 /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0], texture/fb data */
  79 #define SHORT_TO_FLOAT_TEX(S)    ((S) == -32768 ? -1.0F : (S) * (1.0F/32767.0F))
  80
  81 /** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767], texture/fb data */
  82 #define FLOAT_TO_SHORT_TEX(X)    ( (GLint) (32767.0F * (X)) )
  83
  84
  85 /** Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
  86 #define UINT_TO_FLOAT(U)    ((GLfloat) (U) * (1.0F / 4294967295.0))
  87
  88 /** Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
  89 #define FLOAT_TO_UINT(X)    ((GLuint) ((X) * 4294967295.0))
  90
  91
  92 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
  93 #define INT_TO_FLOAT(I)     ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0))
  94
  95 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
  96 /* causes overflow:
  97 #define FLOAT_TO_INT(X)     ( (((GLint) (4294967294.0 * (X))) - 1) / 2 )
  98 */
  99 /* a close approximation: */
 100 #define FLOAT_TO_INT(X)     ( (GLint) (2147483647.0 * (X)) )
 101
 102 /** Convert GLfloat in [-1.0,1.0] to GLint64 in [-(1<<63),(1 << 63) -1] */
 103 #define FLOAT_TO_INT64(X)     ( (GLint64) (9223372036854775807.0 * (double)(X)) )
 104
 105
 106 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0], texture/fb data */
 107 #define INT_TO_FLOAT_TEX(I)    ((I) == -2147483648 ? -1.0F : (I) * (1.0F/2147483647.0))
 108
 109 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647], texture/fb data */
 110 #define FLOAT_TO_INT_TEX(X)    ( (GLint) (2147483647.0 * (X)) )
 111
 112
 113 #define BYTE_TO_UBYTE(b)   ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b)))
 114 #define SHORT_TO_UBYTE(s)  ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7)))
 115 #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8))
 116 #define INT_TO_UBYTE(i)    ((GLubyte) ((i) < 0 ? 0 : (GLubyte) ((i) >> 23)))
 117 #define UINT_TO_UBYTE(i)   ((GLubyte) ((i) >> 24))
 118
 119
 120 #define BYTE_TO_USHORT(b)  ((b) < 0 ? 0 : ((GLushort) (((b) * 65535) / 255)))
 121 #define UBYTE_TO_USHORT(b) (((GLushort) (b) << 8) | (GLushort) (b))
 122 #define SHORT_TO_USHORT(s) ((s) < 0 ? 0 : ((GLushort) (((s) * 65535 / 32767))))
 123 #define INT_TO_USHORT(i)   ((i) < 0 ? 0 : ((GLushort) ((i) >> 15)))
 124 #define UINT_TO_USHORT(i)  ((i) < 0 ? 0 : ((GLushort) ((i) >> 16)))
 125 #define UNCLAMPED_FLOAT_TO_USHORT(us, f)  \
 126         us = ( (GLushort) IROUND( CLAMP((f), 0.0F, 1.0F) * 65535.0F) )
 127 #define CLAMPED_FLOAT_TO_USHORT(us, f)  \
 128         us = ( (GLushort) IROUND( (f) * 65535.0F) )
 129
 130 /*@}*/
 131
 132
 133 /** Stepping a GLfloat pointer by a byte stride */
 134 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 135 /** Stepping a GLuint pointer by a byte stride */
 136 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 137 /** Stepping a GLubyte[4] pointer by a byte stride */
 138 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 139 /** Stepping a GLfloat[4] pointer by a byte stride */
 140 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
 141 /** Stepping a GLchan[4] pointer by a byte stride */
 142 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
 143 /** Stepping a GLchan pointer by a byte stride */
 144 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
 145 /** Stepping a \p t pointer by a byte stride */
 146 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 147
 148
 149 /**********************************************************************/
 150 /** \name 4-element vector operations */
 151 /*@{*/
 152
 153 /** Zero */
 154 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 155
 156 /** Test for equality */
 157 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 158               (a)[1] == (b)[1] &&   \
 159               (a)[2] == (b)[2] &&   \
 160               (a)[3] == (b)[3])
 161
 162 /** Test for equality (unsigned bytes) */
 163 #if defined(__i386__)
 164 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 165 #else
 166 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 167 #endif
 168
 169 /** Copy a 4-element vector */
 170 #define COPY_4V( 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
 178 /** Copy a 4-element vector with cast */
 179 #define COPY_4V_CAST( DST, SRC, CAST )  \
 180 do {                                    \
 181    (DST)[0] = (CAST)(SRC)[0];           \
 182    (DST)[1] = (CAST)(SRC)[1];           \
 183    (DST)[2] = (CAST)(SRC)[2];           \
 184    (DST)[3] = (CAST)(SRC)[3];           \
 185 } while (0)
 186
 187 /** Copy a 4-element unsigned byte vector */
 188 #if defined(__i386__)
 189 #define COPY_4UBV(DST, SRC)                 \
 190 do {                                        \
 191    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 192 } while (0)
 193 #else
 194 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 195 #define COPY_4UBV(DST, SRC)         \
 196 do {                                \
 197    (DST)[0] = (SRC)[0];             \
 198    (DST)[1] = (SRC)[1];             \
 199    (DST)[2] = (SRC)[2];             \
 200    (DST)[3] = (SRC)[3];             \
 201 } while (0)
 202 #endif
 203
 204 /**
 205  * Copy a 4-element float vector
 206  * memcpy seems to be most efficient
 207  */
 208 #define COPY_4FV( DST, SRC )                  \
 209 do {                                          \
 210    _mesa_memcpy(DST, SRC, sizeof(GLfloat) * 4);       \
 211 } while (0)
 212
 213 /** Copy \p SZ elements into a 4-element vector */
 214 #define COPY_SZ_4V(DST, SZ, SRC)  \
 215 do {                              \
 216    switch (SZ) {                  \
 217    case 4: (DST)[3] = (SRC)[3];   \
 218    case 3: (DST)[2] = (SRC)[2];   \
 219    case 2: (DST)[1] = (SRC)[1];   \
 220    case 1: (DST)[0] = (SRC)[0];   \
 221    }                              \
 222 } while(0)
 223
 224 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 225  * default values to the remaining */
 226 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
 227 do {                                 \
 228       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
 229       COPY_SZ_4V( DST, SZ, SRC );    \
 230 } while (0)
 231
 232 /** Subtraction */
 233 #define SUB_4V( DST, SRCA, SRCB )           \
 234 do {                                        \
 235       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 236       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 237       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 238       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
 239 } while (0)
 240
 241 /** Addition */
 242 #define ADD_4V( DST, SRCA, SRCB )           \
 243 do {                                        \
 244       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 245       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 246       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 247       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 248 } while (0)
 249
 250 /** Element-wise multiplication */
 251 #define SCALE_4V( DST, SRCA, SRCB )         \
 252 do {                                        \
 253       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 254       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 255       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 256       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 257 } while (0)
 258
 259 /** In-place addition */
 260 #define ACC_4V( DST, SRC )          \
 261 do {                                \
 262       (DST)[0] += (SRC)[0];         \
 263       (DST)[1] += (SRC)[1];         \
 264       (DST)[2] += (SRC)[2];         \
 265       (DST)[3] += (SRC)[3];         \
 266 } while (0)
 267
 268 /** Element-wise multiplication and addition */
 269 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 270 do {                                        \
 271       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 272       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 273       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 274       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 275 } while (0)
 276
 277 /** In-place scalar multiplication and addition */
 278 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 279 do {                                        \
 280       (DST)[0] += S * (SRCB)[0];            \
 281       (DST)[1] += S * (SRCB)[1];            \
 282       (DST)[2] += S * (SRCB)[2];            \
 283       (DST)[3] += S * (SRCB)[3];            \
 284 } while (0)
 285
 286 /** Scalar multiplication */
 287 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
 288 do {                                    \
 289       (DST)[0] = S * (SRCB)[0];         \
 290       (DST)[1] = S * (SRCB)[1];         \
 291       (DST)[2] = S * (SRCB)[2];         \
 292       (DST)[3] = S * (SRCB)[3];         \
 293 } while (0)
 294
 295 /** In-place scalar multiplication */
 296 #define SELF_SCALE_SCALAR_4V( DST, S ) \
 297 do {                                   \
 298       (DST)[0] *= S;                   \
 299       (DST)[1] *= S;                   \
 300       (DST)[2] *= S;                   \
 301       (DST)[3] *= S;                   \
 302 } while (0)
 303
 304 /** Assignment */
 305 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
 306 do {                                    \
 307     V[0] = V0;                          \
 308     V[1] = V1;                          \
 309     V[2] = V2;                          \
 310     V[3] = V3;                          \
 311 } while(0)
 312
 313 /*@}*/
 314
 315
 316 /**********************************************************************/
 317 /** \name 3-element vector operations*/
 318 /*@{*/
 319
 320 /** Zero */
 321 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 322
 323 /** Test for equality */
 324 #define TEST_EQ_3V(a,b)  \
 325    ((a)[0] == (b)[0] &&  \
 326     (a)[1] == (b)[1] &&  \
 327     (a)[2] == (b)[2])
 328
 329 /** Copy a 3-element vector */
 330 #define COPY_3V( DST, SRC )         \
 331 do {                                \
 332    (DST)[0] = (SRC)[0];             \
 333    (DST)[1] = (SRC)[1];             \
 334    (DST)[2] = (SRC)[2];             \
 335 } while (0)
 336
 337 /** Copy a 3-element vector with cast */
 338 #define COPY_3V_CAST( DST, SRC, CAST )  \
 339 do {                                    \
 340    (DST)[0] = (CAST)(SRC)[0];           \
 341    (DST)[1] = (CAST)(SRC)[1];           \
 342    (DST)[2] = (CAST)(SRC)[2];           \
 343 } while (0)
 344
 345 /** Copy a 3-element float vector */
 346 #define COPY_3FV( DST, SRC )        \
 347 do {                                \
 348    const GLfloat *_tmp = (SRC);     \
 349    (DST)[0] = _tmp[0];              \
 350    (DST)[1] = _tmp[1];              \
 351    (DST)[2] = _tmp[2];              \
 352 } while (0)
 353
 354 /** Subtraction */
 355 #define SUB_3V( DST, SRCA, SRCB )        \
 356 do {                                     \
 357       (DST)[0] = (SRCA)[0] - (SRCB)[0];  \
 358       (DST)[1] = (SRCA)[1] - (SRCB)[1];  \
 359       (DST)[2] = (SRCA)[2] - (SRCB)[2];  \
 360 } while (0)
 361
 362 /** Addition */
 363 #define ADD_3V( DST, SRCA, SRCB )       \
 364 do {                                    \
 365       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
 366       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
 367       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
 368 } while (0)
 369
 370 /** In-place scalar multiplication */
 371 #define 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 /** In-place element-wise multiplication */
 379 #define SELF_SCALE_3V( DST, SRC )   \
 380 do {                                \
 381       (DST)[0] *= (SRC)[0];         \
 382       (DST)[1] *= (SRC)[1];         \
 383       (DST)[2] *= (SRC)[2];         \
 384 } while (0)
 385
 386 /** In-place addition */
 387 #define ACC_3V( DST, SRC )          \
 388 do {                                \
 389       (DST)[0] += (SRC)[0];         \
 390       (DST)[1] += (SRC)[1];         \
 391       (DST)[2] += (SRC)[2];         \
 392 } while (0)
 393
 394 /** Element-wise multiplication and addition */
 395 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 396 do {                                        \
 397       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 398       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 399       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 400 } while (0)
 401
 402 /** Scalar multiplication */
 403 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
 404 do {                                    \
 405       (DST)[0] = S * (SRCB)[0];         \
 406       (DST)[1] = S * (SRCB)[1];         \
 407       (DST)[2] = S * (SRCB)[2];         \
 408 } while (0)
 409
 410 /** In-place scalar multiplication and addition */
 411 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 412 do {                                        \
 413       (DST)[0] += S * (SRCB)[0];            \
 414       (DST)[1] += S * (SRCB)[1];            \
 415       (DST)[2] += S * (SRCB)[2];            \
 416 } while (0)
 417
 418 /** In-place scalar multiplication */
 419 #define SELF_SCALE_SCALAR_3V( DST, S ) \
 420 do {                                   \
 421       (DST)[0] *= S;                   \
 422       (DST)[1] *= S;                   \
 423       (DST)[2] *= S;                   \
 424 } while (0)
 425
 426 /** In-place scalar addition */
 427 #define ACC_SCALAR_3V( DST, S )     \
 428 do {                                \
 429       (DST)[0] += S;                \
 430       (DST)[1] += S;                \
 431       (DST)[2] += S;                \
 432 } while (0)
 433
 434 /** Assignment */
 435 #define ASSIGN_3V( V, V0, V1, V2 )  \
 436 do {                                \
 437     V[0] = V0;                      \
 438     V[1] = V1;                      \
 439     V[2] = V2;                      \
 440 } while(0)
 441
 442 /*@}*/
 443
 444
 445 /**********************************************************************/
 446 /** \name 2-element vector operations*/
 447 /*@{*/
 448
 449 /** Zero */
 450 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 451
 452 /** Copy a 2-element vector */
 453 #define COPY_2V( DST, SRC )         \
 454 do {                        \
 455    (DST)[0] = (SRC)[0];             \
 456    (DST)[1] = (SRC)[1];             \
 457 } while (0)
 458
 459 /** Copy a 2-element vector with cast */
 460 #define COPY_2V_CAST( DST, SRC, CAST )      \
 461 do {                        \
 462    (DST)[0] = (CAST)(SRC)[0];           \
 463    (DST)[1] = (CAST)(SRC)[1];           \
 464 } while (0)
 465
 466 /** Copy a 2-element float vector */
 467 #define COPY_2FV( DST, SRC )            \
 468 do {                        \
 469    const GLfloat *_tmp = (SRC);         \
 470    (DST)[0] = _tmp[0];              \
 471    (DST)[1] = _tmp[1];              \
 472 } while (0)
 473
 474 /** Subtraction */
 475 #define SUB_2V( DST, SRCA, SRCB )       \
 476 do {                        \
 477       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 478       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 479 } while (0)
 480
 481 /** Addition */
 482 #define ADD_2V( DST, SRCA, SRCB )       \
 483 do {                        \
 484       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 485       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 486 } while (0)
 487
 488 /** In-place scalar multiplication */
 489 #define SCALE_2V( DST, SRCA, SRCB )     \
 490 do {                        \
 491       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 492       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 493 } while (0)
 494
 495 /** In-place addition */
 496 #define ACC_2V( DST, SRC )          \
 497 do {                        \
 498       (DST)[0] += (SRC)[0];         \
 499       (DST)[1] += (SRC)[1];         \
 500 } while (0)
 501
 502 /** Element-wise multiplication and addition */
 503 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 504 do {                        \
 505       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 506       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 507 } while (0)
 508
 509 /** Scalar multiplication */
 510 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 511 do {                        \
 512       (DST)[0] = S * (SRCB)[0];         \
 513       (DST)[1] = S * (SRCB)[1];         \
 514 } while (0)
 515
 516 /** In-place scalar multiplication and addition */
 517 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 518 do {                        \
 519       (DST)[0] += S * (SRCB)[0];        \
 520       (DST)[1] += S * (SRCB)[1];        \
 521 } while (0)
 522
 523 /** In-place scalar multiplication */
 524 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 525 do {                        \
 526       (DST)[0] *= S;                \
 527       (DST)[1] *= S;                \
 528 } while (0)
 529
 530 /** In-place scalar addition */
 531 #define ACC_SCALAR_2V( DST, S )         \
 532 do {                        \
 533       (DST)[0] += S;                \
 534       (DST)[1] += S;                \
 535 } while (0)
 536
 537 /** Assign scalers to short vectors */
 538 #define ASSIGN_2V( V, V0, V1 )  \
 539 do {                            \
 540     V[0] = V0;                  \
 541     V[1] = V1;                  \
 542 } while(0)
 543
 544 /*@}*/
 545
 546
 547 /** \name Linear interpolation macros */
 548 /*@{*/
 549
 550 /**
 551  * Linear interpolation
 552  *
 553  * \note \p OUT argument is evaluated twice!
 554  * \note Be wary of using *coord++ as an argument to any of these macros!
 555  */
 556 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 557
 558 /* Can do better with integer math
 559  */
 560 #define INTERP_UB( t, dstub, outub, inub )  \
 561 do {                        \
 562    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
 563    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
 564    GLfloat dstf = LINTERP( t, outf, inf );  \
 565    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
 566 } while (0)
 567
 568 #define INTERP_CHAN( t, dstc, outc, inc )   \
 569 do {                        \
 570    GLfloat inf = CHAN_TO_FLOAT( inc );      \
 571    GLfloat outf = CHAN_TO_FLOAT( outc );    \
 572    GLfloat dstf = LINTERP( t, outf, inf );  \
 573    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
 574 } while (0)
 575
 576 #define INTERP_UI( t, dstui, outui, inui )  \
 577    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
 578
 579 #define INTERP_F( t, dstf, outf, inf )      \
 580    dstf = LINTERP( t, outf, inf )
 581
 582 #define INTERP_4F( t, dst, out, in )        \
 583 do {                        \
 584    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 585    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 586    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 587    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 588 } while (0)
 589
 590 #define INTERP_3F( t, dst, out, in )        \
 591 do {                        \
 592    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 593    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 594    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 595 } while (0)
 596
 597 #define INTERP_4CHAN( t, dst, out, in )         \
 598 do {                            \
 599    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 600    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 601    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 602    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
 603 } while (0)
 604
 605 #define INTERP_3CHAN( t, dst, out, in )         \
 606 do {                            \
 607    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 608    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 609    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 610 } while (0)
 611
 612 #define INTERP_SZ( t, vec, to, out, in, sz )                \
 613 do {                                    \
 614    switch (sz) {                            \
 615    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
 616    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
 617    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
 618    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
 619    }                                    \
 620 } while(0)
 621
 622 /*@}*/
 623
 624
 625
 626 /** Clamp X to [MIN,MAX] */
 627 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 628
 629 /** Minimum of two values: */
 630 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 631
 632 /** Maximum of two values: */
 633 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 634
 635 /** Dot product of two 2-element vectors */
 636 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 637
 638 /** Dot product of two 3-element vectors */
 639 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 640
 641 /** Dot product of two 4-element vectors */
 642 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 643             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 644
 645 /** Dot product of two 4-element vectors */
 646 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
 647
 648
 649 /** Cross product of two 3-element vectors */
 650 #define CROSS3(n, u, v)             \
 651 do {                        \
 652    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 653    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 654    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 655 } while (0)
 656
 657
 658 /* Normalize a 3-element vector to unit length. */
 659 #define NORMALIZE_3FV( V )          \
 660 do {                        \
 661    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 662    if (len) {                   \
 663       len = INV_SQRTF(len);         \
 664       (V)[0] = (GLfloat) ((V)[0] * len);    \
 665       (V)[1] = (GLfloat) ((V)[1] * len);    \
 666       (V)[2] = (GLfloat) ((V)[2] * len);    \
 667    }                        \
 668 } while(0)
 669
 670 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 671 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 672
 673 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 674 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 675
 676
 677 /** casts to silence warnings with some compilers */
 678 #define ENUM_TO_INT(E)     ((GLint)(E))
 679 #define ENUM_TO_FLOAT(E)   ((GLfloat)(GLint)(E))
 680 #define ENUM_TO_DOUBLE(E)  ((GLdouble)(GLint)(E))
 681 #define ENUM_TO_BOOLEAN(E) ((E) ? GL_TRUE : GL_FALSE)
 682
 683
 684 #endif