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 ? -1.0 : (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) * 65535.0))
  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 ? -1.0 : (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 / 4294967295.0F))
  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/4294967294.0F))
  94
  95 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
  96 /* causes overflow:
  97 #define FLOAT_TO_INT(X)     ( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
  98 */
  99 /* a close approximation: */
 100 #define FLOAT_TO_INT(X)     ( (GLint) (2147483647.0 * (X)) )
 101
 102
 103 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0], texture/fb data */
 104 #define INT_TO_FLOAT_TEX(I)    ((I) == -2147483648 ? -1.0 : (I) * (1.0F/2147483647.0))
 105
 106 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647], texture/fb data */
 107 #define FLOAT_TO_INT_TEX(X)    ( (GLint) (2147483647.0F * (X)) )
 108
 109
 110 #define BYTE_TO_UBYTE(b)   ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b)))
 111 #define SHORT_TO_UBYTE(s)  ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7)))
 112 #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8))
 113 #define INT_TO_UBYTE(i)    ((GLubyte) ((i) < 0 ? 0 : (GLubyte) ((i) >> 23)))
 114 #define UINT_TO_UBYTE(i)   ((GLubyte) ((i) >> 24))
 115
 116
 117 #define BYTE_TO_USHORT(b)  ((b) < 0 ? 0 : ((GLushort) (((b) * 65535) / 255)))
 118 #define UBYTE_TO_USHORT(b) (((GLushort) (b) << 8) | (GLushort) (b))
 119 #define SHORT_TO_USHORT(s) ((s) < 0 ? 0 : ((GLushort) (((s) * 65535 / 32767))))
 120 #define INT_TO_USHORT(i)   ((i) < 0 ? 0 : ((GLushort) ((i) >> 15)))
 121 #define UINT_TO_USHORT(i)  ((i) < 0 ? 0 : ((GLushort) ((i) >> 16)))
 122 #define UNCLAMPED_FLOAT_TO_USHORT(us, f)  \
 123         us = ( (GLushort) IROUND( CLAMP((f), 0.0, 1.0) * 65535.0F) )
 124 #define CLAMPED_FLOAT_TO_USHORT(us, f)  \
 125         us = ( (GLushort) IROUND( (f) * 65535.0F) )
 126
 127 /*@}*/
 128
 129
 130 /** Stepping a GLfloat pointer by a byte stride */
 131 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 132 /** Stepping a GLuint pointer by a byte stride */
 133 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 134 /** Stepping a GLubyte[4] pointer by a byte stride */
 135 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 136 /** Stepping a GLfloat[4] pointer by a byte stride */
 137 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
 138 /** Stepping a GLchan[4] pointer by a byte stride */
 139 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
 140 /** Stepping a GLchan pointer by a byte stride */
 141 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
 142 /** Stepping a \p t pointer by a byte stride */
 143 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 144
 145
 146 /**********************************************************************/
 147 /** \name 4-element vector operations */
 148 /*@{*/
 149
 150 /** Zero */
 151 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 152
 153 /** Test for equality */
 154 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 155               (a)[1] == (b)[1] &&   \
 156               (a)[2] == (b)[2] &&   \
 157               (a)[3] == (b)[3])
 158
 159 /** Test for equality (unsigned bytes) */
 160 #if defined(__i386__)
 161 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 162 #else
 163 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 164 #endif
 165
 166 /** Copy a 4-element vector */
 167 #define COPY_4V( DST, SRC )         \
 168 do {                                \
 169    (DST)[0] = (SRC)[0];             \
 170    (DST)[1] = (SRC)[1];             \
 171    (DST)[2] = (SRC)[2];             \
 172    (DST)[3] = (SRC)[3];             \
 173 } while (0)
 174
 175 /** Copy a 4-element vector with cast */
 176 #define COPY_4V_CAST( DST, SRC, CAST )  \
 177 do {                                    \
 178    (DST)[0] = (CAST)(SRC)[0];           \
 179    (DST)[1] = (CAST)(SRC)[1];           \
 180    (DST)[2] = (CAST)(SRC)[2];           \
 181    (DST)[3] = (CAST)(SRC)[3];           \
 182 } while (0)
 183
 184 /** Copy a 4-element unsigned byte vector */
 185 #if defined(__i386__)
 186 #define COPY_4UBV(DST, SRC)                 \
 187 do {                                        \
 188    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 189 } while (0)
 190 #else
 191 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 192 #define COPY_4UBV(DST, SRC)         \
 193 do {                                \
 194    (DST)[0] = (SRC)[0];             \
 195    (DST)[1] = (SRC)[1];             \
 196    (DST)[2] = (SRC)[2];             \
 197    (DST)[3] = (SRC)[3];             \
 198 } while (0)
 199 #endif
 200
 201 /**
 202  * Copy a 4-element float vector (avoid using FPU registers)
 203  * XXX Could use two 64-bit moves on 64-bit systems
 204  */
 205 #define COPY_4FV( DST, SRC )                  \
 206 do {                                          \
 207    const GLuint *_s = (const GLuint *) (SRC); \
 208    GLuint *_d = (GLuint *) (DST);             \
 209    _d[0] = _s[0];                             \
 210    _d[1] = _s[1];                             \
 211    _d[2] = _s[2];                             \
 212    _d[3] = _s[3];                             \
 213 } while (0)
 214
 215 /** Copy \p SZ elements into a 4-element vector */
 216 #define COPY_SZ_4V(DST, SZ, SRC)  \
 217 do {                              \
 218    switch (SZ) {                  \
 219    case 4: (DST)[3] = (SRC)[3];   \
 220    case 3: (DST)[2] = (SRC)[2];   \
 221    case 2: (DST)[1] = (SRC)[1];   \
 222    case 1: (DST)[0] = (SRC)[0];   \
 223    }                              \
 224 } while(0)
 225
 226 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 227  * default values to the remaining */
 228 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
 229 do {                                 \
 230       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
 231       COPY_SZ_4V( DST, SZ, SRC );    \
 232 } while (0)
 233
 234 /** Subtraction */
 235 #define SUB_4V( DST, SRCA, SRCB )           \
 236 do {                                        \
 237       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 238       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 239       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 240       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
 241 } while (0)
 242
 243 /** Addition */
 244 #define ADD_4V( DST, SRCA, SRCB )           \
 245 do {                                        \
 246       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 247       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 248       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 249       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 250 } while (0)
 251
 252 /** Element-wise multiplication */
 253 #define SCALE_4V( DST, SRCA, SRCB )         \
 254 do {                                        \
 255       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 256       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 257       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 258       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 259 } while (0)
 260
 261 /** In-place addition */
 262 #define ACC_4V( DST, SRC )          \
 263 do {                                \
 264       (DST)[0] += (SRC)[0];         \
 265       (DST)[1] += (SRC)[1];         \
 266       (DST)[2] += (SRC)[2];         \
 267       (DST)[3] += (SRC)[3];         \
 268 } while (0)
 269
 270 /** Element-wise multiplication and addition */
 271 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 272 do {                                        \
 273       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 274       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 275       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 276       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 277 } while (0)
 278
 279 /** In-place scalar multiplication and addition */
 280 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 281 do {                                        \
 282       (DST)[0] += S * (SRCB)[0];            \
 283       (DST)[1] += S * (SRCB)[1];            \
 284       (DST)[2] += S * (SRCB)[2];            \
 285       (DST)[3] += S * (SRCB)[3];            \
 286 } while (0)
 287
 288 /** Scalar multiplication */
 289 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
 290 do {                                    \
 291       (DST)[0] = S * (SRCB)[0];         \
 292       (DST)[1] = S * (SRCB)[1];         \
 293       (DST)[2] = S * (SRCB)[2];         \
 294       (DST)[3] = S * (SRCB)[3];         \
 295 } while (0)
 296
 297 /** In-place scalar multiplication */
 298 #define SELF_SCALE_SCALAR_4V( DST, S ) \
 299 do {                                   \
 300       (DST)[0] *= S;                   \
 301       (DST)[1] *= S;                   \
 302       (DST)[2] *= S;                   \
 303       (DST)[3] *= S;                   \
 304 } while (0)
 305
 306 /** Assignment */
 307 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
 308 do {                                    \
 309     V[0] = V0;                          \
 310     V[1] = V1;                          \
 311     V[2] = V2;                          \
 312     V[3] = V3;                          \
 313 } while(0)
 314
 315 /*@}*/
 316
 317
 318 /**********************************************************************/
 319 /** \name 3-element vector operations*/
 320 /*@{*/
 321
 322 /** Zero */
 323 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 324
 325 /** Test for equality */
 326 #define TEST_EQ_3V(a,b)  \
 327    ((a)[0] == (b)[0] &&  \
 328     (a)[1] == (b)[1] &&  \
 329     (a)[2] == (b)[2])
 330
 331 /** Copy a 3-element vector */
 332 #define COPY_3V( DST, SRC )         \
 333 do {                                \
 334    (DST)[0] = (SRC)[0];             \
 335    (DST)[1] = (SRC)[1];             \
 336    (DST)[2] = (SRC)[2];             \
 337 } while (0)
 338
 339 /** Copy a 3-element vector with cast */
 340 #define COPY_3V_CAST( DST, SRC, CAST )  \
 341 do {                                    \
 342    (DST)[0] = (CAST)(SRC)[0];           \
 343    (DST)[1] = (CAST)(SRC)[1];           \
 344    (DST)[2] = (CAST)(SRC)[2];           \
 345 } while (0)
 346
 347 /** Copy a 3-element float vector */
 348 #define COPY_3FV( DST, SRC )        \
 349 do {                                \
 350    const GLfloat *_tmp = (SRC);     \
 351    (DST)[0] = _tmp[0];              \
 352    (DST)[1] = _tmp[1];              \
 353    (DST)[2] = _tmp[2];              \
 354 } while (0)
 355
 356 /** Subtraction */
 357 #define SUB_3V( DST, SRCA, SRCB )        \
 358 do {                                     \
 359       (DST)[0] = (SRCA)[0] - (SRCB)[0];  \
 360       (DST)[1] = (SRCA)[1] - (SRCB)[1];  \
 361       (DST)[2] = (SRCA)[2] - (SRCB)[2];  \
 362 } while (0)
 363
 364 /** Addition */
 365 #define ADD_3V( DST, SRCA, SRCB )       \
 366 do {                                    \
 367       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
 368       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
 369       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
 370 } while (0)
 371
 372 /** In-place scalar multiplication */
 373 #define SCALE_3V( DST, SRCA, SRCB )     \
 374 do {                                    \
 375       (DST)[0] = (SRCA)[0] * (SRCB)[0]; \
 376       (DST)[1] = (SRCA)[1] * (SRCB)[1]; \
 377       (DST)[2] = (SRCA)[2] * (SRCB)[2]; \
 378 } while (0)
 379
 380 /** In-place element-wise multiplication */
 381 #define SELF_SCALE_3V( DST, SRC )   \
 382 do {                                \
 383       (DST)[0] *= (SRC)[0];         \
 384       (DST)[1] *= (SRC)[1];         \
 385       (DST)[2] *= (SRC)[2];         \
 386 } while (0)
 387
 388 /** In-place addition */
 389 #define ACC_3V( DST, SRC )          \
 390 do {                                \
 391       (DST)[0] += (SRC)[0];         \
 392       (DST)[1] += (SRC)[1];         \
 393       (DST)[2] += (SRC)[2];         \
 394 } while (0)
 395
 396 /** Element-wise multiplication and addition */
 397 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 398 do {                                        \
 399       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 400       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 401       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 402 } while (0)
 403
 404 /** Scalar multiplication */
 405 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
 406 do {                                    \
 407       (DST)[0] = S * (SRCB)[0];         \
 408       (DST)[1] = S * (SRCB)[1];         \
 409       (DST)[2] = S * (SRCB)[2];         \
 410 } while (0)
 411
 412 /** In-place scalar multiplication and addition */
 413 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 414 do {                                        \
 415       (DST)[0] += S * (SRCB)[0];            \
 416       (DST)[1] += S * (SRCB)[1];            \
 417       (DST)[2] += S * (SRCB)[2];            \
 418 } while (0)
 419
 420 /** In-place scalar multiplication */
 421 #define SELF_SCALE_SCALAR_3V( DST, S ) \
 422 do {                                   \
 423       (DST)[0] *= S;                   \
 424       (DST)[1] *= S;                   \
 425       (DST)[2] *= S;                   \
 426 } while (0)
 427
 428 /** In-place scalar addition */
 429 #define ACC_SCALAR_3V( DST, S )     \
 430 do {                                \
 431       (DST)[0] += S;                \
 432       (DST)[1] += S;                \
 433       (DST)[2] += S;                \
 434 } while (0)
 435
 436 /** Assignment */
 437 #define ASSIGN_3V( V, V0, V1, V2 )  \
 438 do {                                \
 439     V[0] = V0;                      \
 440     V[1] = V1;                      \
 441     V[2] = V2;                      \
 442 } while(0)
 443
 444 /*@}*/
 445
 446
 447 /**********************************************************************/
 448 /** \name 2-element vector operations*/
 449 /*@{*/
 450
 451 /** Zero */
 452 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 453
 454 /** Copy a 2-element vector */
 455 #define COPY_2V( DST, SRC )         \
 456 do {                        \
 457    (DST)[0] = (SRC)[0];             \
 458    (DST)[1] = (SRC)[1];             \
 459 } while (0)
 460
 461 /** Copy a 2-element vector with cast */
 462 #define COPY_2V_CAST( DST, SRC, CAST )      \
 463 do {                        \
 464    (DST)[0] = (CAST)(SRC)[0];           \
 465    (DST)[1] = (CAST)(SRC)[1];           \
 466 } while (0)
 467
 468 /** Copy a 2-element float vector */
 469 #define COPY_2FV( DST, SRC )            \
 470 do {                        \
 471    const GLfloat *_tmp = (SRC);         \
 472    (DST)[0] = _tmp[0];              \
 473    (DST)[1] = _tmp[1];              \
 474 } while (0)
 475
 476 /** Subtraction */
 477 #define SUB_2V( DST, SRCA, SRCB )       \
 478 do {                        \
 479       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 480       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 481 } while (0)
 482
 483 /** Addition */
 484 #define ADD_2V( DST, SRCA, SRCB )       \
 485 do {                        \
 486       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 487       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 488 } while (0)
 489
 490 /** In-place scalar multiplication */
 491 #define SCALE_2V( DST, SRCA, SRCB )     \
 492 do {                        \
 493       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 494       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 495 } while (0)
 496
 497 /** In-place addition */
 498 #define ACC_2V( DST, SRC )          \
 499 do {                        \
 500       (DST)[0] += (SRC)[0];         \
 501       (DST)[1] += (SRC)[1];         \
 502 } while (0)
 503
 504 /** Element-wise multiplication and addition */
 505 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 506 do {                        \
 507       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 508       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 509 } while (0)
 510
 511 /** Scalar multiplication */
 512 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 513 do {                        \
 514       (DST)[0] = S * (SRCB)[0];         \
 515       (DST)[1] = S * (SRCB)[1];         \
 516 } while (0)
 517
 518 /** In-place scalar multiplication and addition */
 519 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 520 do {                        \
 521       (DST)[0] += S * (SRCB)[0];        \
 522       (DST)[1] += S * (SRCB)[1];        \
 523 } while (0)
 524
 525 /** In-place scalar multiplication */
 526 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 527 do {                        \
 528       (DST)[0] *= S;                \
 529       (DST)[1] *= S;                \
 530 } while (0)
 531
 532 /** In-place scalar addition */
 533 #define ACC_SCALAR_2V( DST, S )         \
 534 do {                        \
 535       (DST)[0] += S;                \
 536       (DST)[1] += S;                \
 537 } while (0)
 538
 539 /** Assign scalers to short vectors */
 540 #define ASSIGN_2V( V, V0, V1 )  \
 541 do {                            \
 542     V[0] = V0;                  \
 543     V[1] = V1;                  \
 544 } while(0)
 545
 546 /*@}*/
 547
 548
 549 /** \name Linear interpolation macros */
 550 /*@{*/
 551
 552 /**
 553  * Linear interpolation
 554  *
 555  * \note \p OUT argument is evaluated twice!
 556  * \note Be wary of using *coord++ as an argument to any of these macros!
 557  */
 558 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 559
 560 /* Can do better with integer math
 561  */
 562 #define INTERP_UB( t, dstub, outub, inub )  \
 563 do {                        \
 564    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
 565    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
 566    GLfloat dstf = LINTERP( t, outf, inf );  \
 567    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
 568 } while (0)
 569
 570 #define INTERP_CHAN( t, dstc, outc, inc )   \
 571 do {                        \
 572    GLfloat inf = CHAN_TO_FLOAT( inc );      \
 573    GLfloat outf = CHAN_TO_FLOAT( outc );    \
 574    GLfloat dstf = LINTERP( t, outf, inf );  \
 575    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
 576 } while (0)
 577
 578 #define INTERP_UI( t, dstui, outui, inui )  \
 579    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
 580
 581 #define INTERP_F( t, dstf, outf, inf )      \
 582    dstf = LINTERP( t, outf, inf )
 583
 584 #define INTERP_4F( t, dst, out, in )        \
 585 do {                        \
 586    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 587    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 588    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 589    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 590 } while (0)
 591
 592 #define INTERP_3F( t, dst, out, in )        \
 593 do {                        \
 594    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 595    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 596    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 597 } while (0)
 598
 599 #define INTERP_4CHAN( t, dst, out, in )         \
 600 do {                            \
 601    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 602    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 603    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 604    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
 605 } while (0)
 606
 607 #define INTERP_3CHAN( t, dst, out, in )         \
 608 do {                            \
 609    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 610    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 611    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 612 } while (0)
 613
 614 #define INTERP_SZ( t, vec, to, out, in, sz )                \
 615 do {                                    \
 616    switch (sz) {                            \
 617    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
 618    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
 619    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
 620    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
 621    }                                    \
 622 } while(0)
 623
 624 /*@}*/
 625
 626
 627
 628 /** Clamp X to [MIN,MAX] */
 629 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 630
 631 /** Assign X to CLAMP(X, MIN, MAX) */
 632 #define CLAMP_SELF(x, mn, mx)  \
 633    ( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
 634
 635
 636
 637 /** Minimum of two values: */
 638 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 639
 640 /** Maximum of two values: */
 641 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 642
 643 /** Dot product of two 2-element vectors */
 644 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 645
 646 /** Dot product of two 3-element vectors */
 647 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 648
 649 /** Dot product of two 4-element vectors */
 650 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 651             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 652
 653 /** Dot product of two 4-element vectors */
 654 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
 655
 656
 657 /** Cross product of two 3-element vectors */
 658 #define CROSS3(n, u, v)             \
 659 do {                        \
 660    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 661    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 662    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 663 } while (0)
 664
 665
 666 /* Normalize a 3-element vector to unit length. */
 667 #define NORMALIZE_3FV( V )          \
 668 do {                        \
 669    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 670    if (len) {                   \
 671       len = INV_SQRTF(len);         \
 672       (V)[0] = (GLfloat) ((V)[0] * len);    \
 673       (V)[1] = (GLfloat) ((V)[1] * len);    \
 674       (V)[2] = (GLfloat) ((V)[2] * len);    \
 675    }                        \
 676 } while(0)
 677
 678 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 679 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 680
 681 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 682 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 683
 684
 685 /** casts to silence warnings with some compilers */
 686 #define ENUM_TO_INT(E)     ((GLint)(E))
 687 #define ENUM_TO_FLOAT(E)   ((GLfloat)(GLint)(E))
 688 #define ENUM_TO_DOUBLE(E)  ((GLdouble)(GLint)(E))
 689 #define ENUM_TO_BOOLEAN(E) ((E) ? GL_TRUE : GL_FALSE)
 690
 691
 692 #endif