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)     ((GLfloat) ((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 #define UNCLAMPED_FLOAT_TO_SHORT(s, f)  \
 131         s = ( (GLshort) IROUND( CLAMP((f), -1.0F, 1.0F) * 32767.0F) )
 132
 133 /***
 134  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
 135  *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
 136  ***/
 137 #if defined(USE_IEEE) && !defined(DEBUG)
 138 #define IEEE_0996 0x3f7f0000    /* 0.996 or so */
 139 /* This function/macro is sensitive to precision.  Test very carefully
 140  * if you change it!
 141  */
 142 #define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)                                 \
 143         do {                                                            \
 144            fi_type __tmp;                                               \
 145            __tmp.f = (F);                                               \
 146            if (__tmp.i < 0)                                             \
 147               UB = (GLubyte) 0;                                         \
 148            else if (__tmp.i >= IEEE_0996)                               \
 149               UB = (GLubyte) 255;                                       \
 150            else {                                                       \
 151               __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F;           \
 152               UB = (GLubyte) __tmp.i;                                   \
 153            }                                                            \
 154         } while (0)
 155 #define CLAMPED_FLOAT_TO_UBYTE(UB, F)                                   \
 156         do {                                                            \
 157            fi_type __tmp;                                               \
 158            __tmp.f = (F) * (255.0F/256.0F) + 32768.0F;                  \
 159            UB = (GLubyte) __tmp.i;                                      \
 160         } while (0)
 161 #else
 162 #define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \
 163         ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F))
 164 #define CLAMPED_FLOAT_TO_UBYTE(ub, f) \
 165         ub = ((GLubyte) IROUND((f) * 255.0F))
 166 #endif
 167
 168 /*@}*/
 169
 170
 171 /** Stepping a GLfloat pointer by a byte stride */
 172 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 173 /** Stepping a GLuint pointer by a byte stride */
 174 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 175 /** Stepping a GLubyte[4] pointer by a byte stride */
 176 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 177 /** Stepping a GLfloat[4] pointer by a byte stride */
 178 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
 179 /** Stepping a GLchan[4] pointer by a byte stride */
 180 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
 181 /** Stepping a GLchan pointer by a byte stride */
 182 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
 183 /** Stepping a \p t pointer by a byte stride */
 184 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 185
 186
 187 /**********************************************************************/
 188 /** \name 4-element vector operations */
 189 /*@{*/
 190
 191 /** Zero */
 192 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 193
 194 /** Test for equality */
 195 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 196               (a)[1] == (b)[1] &&   \
 197               (a)[2] == (b)[2] &&   \
 198               (a)[3] == (b)[3])
 199
 200 /** Test for equality (unsigned bytes) */
 201 #if defined(__i386__)
 202 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 203 #else
 204 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 205 #endif
 206
 207 /** Copy a 4-element vector */
 208 #define COPY_4V( DST, SRC )         \
 209 do {                                \
 210    (DST)[0] = (SRC)[0];             \
 211    (DST)[1] = (SRC)[1];             \
 212    (DST)[2] = (SRC)[2];             \
 213    (DST)[3] = (SRC)[3];             \
 214 } while (0)
 215
 216 /** Copy a 4-element vector with cast */
 217 #define COPY_4V_CAST( DST, SRC, CAST )  \
 218 do {                                    \
 219    (DST)[0] = (CAST)(SRC)[0];           \
 220    (DST)[1] = (CAST)(SRC)[1];           \
 221    (DST)[2] = (CAST)(SRC)[2];           \
 222    (DST)[3] = (CAST)(SRC)[3];           \
 223 } while (0)
 224
 225 /** Copy a 4-element unsigned byte vector */
 226 #if defined(__i386__)
 227 #define COPY_4UBV(DST, SRC)                 \
 228 do {                                        \
 229    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 230 } while (0)
 231 #else
 232 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 233 #define COPY_4UBV(DST, SRC)         \
 234 do {                                \
 235    (DST)[0] = (SRC)[0];             \
 236    (DST)[1] = (SRC)[1];             \
 237    (DST)[2] = (SRC)[2];             \
 238    (DST)[3] = (SRC)[3];             \
 239 } while (0)
 240 #endif
 241
 242 /**
 243  * Copy a 4-element float vector
 244  * memcpy seems to be most efficient
 245  */
 246 #define COPY_4FV( DST, SRC )                  \
 247 do {                                          \
 248    memcpy(DST, SRC, sizeof(GLfloat) * 4);     \
 249 } while (0)
 250
 251 /** Copy \p SZ elements into a 4-element vector */
 252 #define COPY_SZ_4V(DST, SZ, SRC)  \
 253 do {                              \
 254    switch (SZ) {                  \
 255    case 4: (DST)[3] = (SRC)[3];   \
 256    case 3: (DST)[2] = (SRC)[2];   \
 257    case 2: (DST)[1] = (SRC)[1];   \
 258    case 1: (DST)[0] = (SRC)[0];   \
 259    }                              \
 260 } while(0)
 261
 262 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 263  * default values to the remaining */
 264 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
 265 do {                                 \
 266       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
 267       COPY_SZ_4V( DST, SZ, SRC );    \
 268 } while (0)
 269
 270 /** Subtraction */
 271 #define SUB_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 /** Addition */
 280 #define ADD_4V( DST, SRCA, SRCB )           \
 281 do {                                        \
 282       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 283       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 284       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 285       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 286 } while (0)
 287
 288 /** Element-wise multiplication */
 289 #define SCALE_4V( DST, SRCA, SRCB )         \
 290 do {                                        \
 291       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 292       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 293       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 294       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 295 } while (0)
 296
 297 /** In-place addition */
 298 #define ACC_4V( DST, SRC )          \
 299 do {                                \
 300       (DST)[0] += (SRC)[0];         \
 301       (DST)[1] += (SRC)[1];         \
 302       (DST)[2] += (SRC)[2];         \
 303       (DST)[3] += (SRC)[3];         \
 304 } while (0)
 305
 306 /** Element-wise multiplication and addition */
 307 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 308 do {                                        \
 309       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 310       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 311       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 312       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 313 } while (0)
 314
 315 /** In-place scalar multiplication and addition */
 316 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 317 do {                                        \
 318       (DST)[0] += S * (SRCB)[0];            \
 319       (DST)[1] += S * (SRCB)[1];            \
 320       (DST)[2] += S * (SRCB)[2];            \
 321       (DST)[3] += S * (SRCB)[3];            \
 322 } while (0)
 323
 324 /** Scalar multiplication */
 325 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
 326 do {                                    \
 327       (DST)[0] = S * (SRCB)[0];         \
 328       (DST)[1] = S * (SRCB)[1];         \
 329       (DST)[2] = S * (SRCB)[2];         \
 330       (DST)[3] = S * (SRCB)[3];         \
 331 } while (0)
 332
 333 /** In-place scalar multiplication */
 334 #define SELF_SCALE_SCALAR_4V( DST, S ) \
 335 do {                                   \
 336       (DST)[0] *= S;                   \
 337       (DST)[1] *= S;                   \
 338       (DST)[2] *= S;                   \
 339       (DST)[3] *= S;                   \
 340 } while (0)
 341
 342 /** Assignment */
 343 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
 344 do {                                    \
 345     V[0] = V0;                          \
 346     V[1] = V1;                          \
 347     V[2] = V2;                          \
 348     V[3] = V3;                          \
 349 } while(0)
 350
 351 /*@}*/
 352
 353
 354 /**********************************************************************/
 355 /** \name 3-element vector operations*/
 356 /*@{*/
 357
 358 /** Zero */
 359 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 360
 361 /** Test for equality */
 362 #define TEST_EQ_3V(a,b)  \
 363    ((a)[0] == (b)[0] &&  \
 364     (a)[1] == (b)[1] &&  \
 365     (a)[2] == (b)[2])
 366
 367 /** Copy a 3-element vector */
 368 #define COPY_3V( DST, SRC )         \
 369 do {                                \
 370    (DST)[0] = (SRC)[0];             \
 371    (DST)[1] = (SRC)[1];             \
 372    (DST)[2] = (SRC)[2];             \
 373 } while (0)
 374
 375 /** Copy a 3-element vector with cast */
 376 #define COPY_3V_CAST( DST, SRC, CAST )  \
 377 do {                                    \
 378    (DST)[0] = (CAST)(SRC)[0];           \
 379    (DST)[1] = (CAST)(SRC)[1];           \
 380    (DST)[2] = (CAST)(SRC)[2];           \
 381 } while (0)
 382
 383 /** Copy a 3-element float vector */
 384 #define COPY_3FV( DST, SRC )        \
 385 do {                                \
 386    const GLfloat *_tmp = (SRC);     \
 387    (DST)[0] = _tmp[0];              \
 388    (DST)[1] = _tmp[1];              \
 389    (DST)[2] = _tmp[2];              \
 390 } while (0)
 391
 392 /** Subtraction */
 393 #define SUB_3V( DST, SRCA, SRCB )        \
 394 do {                                     \
 395       (DST)[0] = (SRCA)[0] - (SRCB)[0];  \
 396       (DST)[1] = (SRCA)[1] - (SRCB)[1];  \
 397       (DST)[2] = (SRCA)[2] - (SRCB)[2];  \
 398 } while (0)
 399
 400 /** Addition */
 401 #define ADD_3V( DST, SRCA, SRCB )       \
 402 do {                                    \
 403       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
 404       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
 405       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
 406 } while (0)
 407
 408 /** In-place scalar multiplication */
 409 #define SCALE_3V( DST, SRCA, SRCB )     \
 410 do {                                    \
 411       (DST)[0] = (SRCA)[0] * (SRCB)[0]; \
 412       (DST)[1] = (SRCA)[1] * (SRCB)[1]; \
 413       (DST)[2] = (SRCA)[2] * (SRCB)[2]; \
 414 } while (0)
 415
 416 /** In-place element-wise multiplication */
 417 #define SELF_SCALE_3V( DST, SRC )   \
 418 do {                                \
 419       (DST)[0] *= (SRC)[0];         \
 420       (DST)[1] *= (SRC)[1];         \
 421       (DST)[2] *= (SRC)[2];         \
 422 } while (0)
 423
 424 /** In-place addition */
 425 #define ACC_3V( DST, SRC )          \
 426 do {                                \
 427       (DST)[0] += (SRC)[0];         \
 428       (DST)[1] += (SRC)[1];         \
 429       (DST)[2] += (SRC)[2];         \
 430 } while (0)
 431
 432 /** Element-wise multiplication and addition */
 433 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 434 do {                                        \
 435       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 436       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 437       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 438 } while (0)
 439
 440 /** Scalar multiplication */
 441 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
 442 do {                                    \
 443       (DST)[0] = S * (SRCB)[0];         \
 444       (DST)[1] = S * (SRCB)[1];         \
 445       (DST)[2] = S * (SRCB)[2];         \
 446 } while (0)
 447
 448 /** In-place scalar multiplication and addition */
 449 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 450 do {                                        \
 451       (DST)[0] += S * (SRCB)[0];            \
 452       (DST)[1] += S * (SRCB)[1];            \
 453       (DST)[2] += S * (SRCB)[2];            \
 454 } while (0)
 455
 456 /** In-place scalar multiplication */
 457 #define SELF_SCALE_SCALAR_3V( DST, S ) \
 458 do {                                   \
 459       (DST)[0] *= S;                   \
 460       (DST)[1] *= S;                   \
 461       (DST)[2] *= S;                   \
 462 } while (0)
 463
 464 /** In-place scalar addition */
 465 #define ACC_SCALAR_3V( DST, S )     \
 466 do {                                \
 467       (DST)[0] += S;                \
 468       (DST)[1] += S;                \
 469       (DST)[2] += S;                \
 470 } while (0)
 471
 472 /** Assignment */
 473 #define ASSIGN_3V( V, V0, V1, V2 )  \
 474 do {                                \
 475     V[0] = V0;                      \
 476     V[1] = V1;                      \
 477     V[2] = V2;                      \
 478 } while(0)
 479
 480 /*@}*/
 481
 482
 483 /**********************************************************************/
 484 /** \name 2-element vector operations*/
 485 /*@{*/
 486
 487 /** Zero */
 488 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 489
 490 /** Copy a 2-element vector */
 491 #define COPY_2V( DST, SRC )         \
 492 do {                        \
 493    (DST)[0] = (SRC)[0];             \
 494    (DST)[1] = (SRC)[1];             \
 495 } while (0)
 496
 497 /** Copy a 2-element vector with cast */
 498 #define COPY_2V_CAST( DST, SRC, CAST )      \
 499 do {                        \
 500    (DST)[0] = (CAST)(SRC)[0];           \
 501    (DST)[1] = (CAST)(SRC)[1];           \
 502 } while (0)
 503
 504 /** Copy a 2-element float vector */
 505 #define COPY_2FV( DST, SRC )            \
 506 do {                        \
 507    const GLfloat *_tmp = (SRC);         \
 508    (DST)[0] = _tmp[0];              \
 509    (DST)[1] = _tmp[1];              \
 510 } while (0)
 511
 512 /** Subtraction */
 513 #define SUB_2V( DST, SRCA, SRCB )       \
 514 do {                        \
 515       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 516       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 517 } while (0)
 518
 519 /** Addition */
 520 #define ADD_2V( DST, SRCA, SRCB )       \
 521 do {                        \
 522       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 523       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 524 } while (0)
 525
 526 /** In-place scalar multiplication */
 527 #define SCALE_2V( DST, SRCA, SRCB )     \
 528 do {                        \
 529       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 530       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 531 } while (0)
 532
 533 /** In-place addition */
 534 #define ACC_2V( DST, SRC )          \
 535 do {                        \
 536       (DST)[0] += (SRC)[0];         \
 537       (DST)[1] += (SRC)[1];         \
 538 } while (0)
 539
 540 /** Element-wise multiplication and addition */
 541 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 542 do {                        \
 543       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 544       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 545 } while (0)
 546
 547 /** Scalar multiplication */
 548 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 549 do {                        \
 550       (DST)[0] = S * (SRCB)[0];         \
 551       (DST)[1] = S * (SRCB)[1];         \
 552 } while (0)
 553
 554 /** In-place scalar multiplication and addition */
 555 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 556 do {                        \
 557       (DST)[0] += S * (SRCB)[0];        \
 558       (DST)[1] += S * (SRCB)[1];        \
 559 } while (0)
 560
 561 /** In-place scalar multiplication */
 562 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 563 do {                        \
 564       (DST)[0] *= S;                \
 565       (DST)[1] *= S;                \
 566 } while (0)
 567
 568 /** In-place scalar addition */
 569 #define ACC_SCALAR_2V( DST, S )         \
 570 do {                        \
 571       (DST)[0] += S;                \
 572       (DST)[1] += S;                \
 573 } while (0)
 574
 575 /** Assign scalers to short vectors */
 576 #define ASSIGN_2V( V, V0, V1 )  \
 577 do {                            \
 578     V[0] = V0;                  \
 579     V[1] = V1;                  \
 580 } while(0)
 581
 582 /*@}*/
 583
 584
 585 /** \name Linear interpolation macros */
 586 /*@{*/
 587
 588 /**
 589  * Linear interpolation
 590  *
 591  * \note \p OUT argument is evaluated twice!
 592  * \note Be wary of using *coord++ as an argument to any of these macros!
 593  */
 594 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 595
 596 /* Can do better with integer math
 597  */
 598 #define INTERP_UB( t, dstub, outub, inub )  \
 599 do {                        \
 600    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
 601    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
 602    GLfloat dstf = LINTERP( t, outf, inf );  \
 603    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
 604 } while (0)
 605
 606 #define INTERP_CHAN( t, dstc, outc, inc )   \
 607 do {                        \
 608    GLfloat inf = CHAN_TO_FLOAT( inc );      \
 609    GLfloat outf = CHAN_TO_FLOAT( outc );    \
 610    GLfloat dstf = LINTERP( t, outf, inf );  \
 611    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
 612 } while (0)
 613
 614 #define INTERP_UI( t, dstui, outui, inui )  \
 615    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
 616
 617 #define INTERP_F( t, dstf, outf, inf )      \
 618    dstf = LINTERP( t, outf, inf )
 619
 620 #define INTERP_4F( t, dst, out, in )        \
 621 do {                        \
 622    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 623    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 624    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 625    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 626 } while (0)
 627
 628 #define INTERP_3F( t, dst, out, in )        \
 629 do {                        \
 630    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 631    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 632    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 633 } while (0)
 634
 635 #define INTERP_4CHAN( t, dst, out, in )         \
 636 do {                            \
 637    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 638    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 639    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 640    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
 641 } while (0)
 642
 643 #define INTERP_3CHAN( t, dst, out, in )         \
 644 do {                            \
 645    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
 646    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
 647    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
 648 } while (0)
 649
 650 #define INTERP_SZ( t, vec, to, out, in, sz )                \
 651 do {                                    \
 652    switch (sz) {                            \
 653    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
 654    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
 655    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
 656    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
 657    }                                    \
 658 } while(0)
 659
 660 /*@}*/
 661
 662
 663
 664 /** Clamp X to [MIN,MAX] */
 665 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 666
 667 /** Minimum of two values: */
 668 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 669
 670 /** Maximum of two values: */
 671 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 672
 673 /** Dot product of two 2-element vectors */
 674 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 675
 676 /** Dot product of two 3-element vectors */
 677 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 678
 679 /** Dot product of two 4-element vectors */
 680 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 681             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 682
 683 /** Dot product of two 4-element vectors */
 684 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
 685
 686
 687 /** Cross product of two 3-element vectors */
 688 #define CROSS3(n, u, v)             \
 689 do {                        \
 690    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 691    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 692    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 693 } while (0)
 694
 695
 696 /* Normalize a 3-element vector to unit length. */
 697 #define NORMALIZE_3FV( V )          \
 698 do {                        \
 699    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 700    if (len) {                   \
 701       len = INV_SQRTF(len);         \
 702       (V)[0] = (GLfloat) ((V)[0] * len);    \
 703       (V)[1] = (GLfloat) ((V)[1] * len);    \
 704       (V)[2] = (GLfloat) ((V)[2] * len);    \
 705    }                        \
 706 } while(0)
 707
 708 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 709 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 710
 711 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 712 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 713
 714
 715 /** casts to silence warnings with some compilers */
 716 #define ENUM_TO_INT(E)     ((GLint)(E))
 717 #define ENUM_TO_FLOAT(E)   ((GLfloat)(GLint)(E))
 718 #define ENUM_TO_DOUBLE(E)  ((GLdouble)(GLint)(E))
 719 #define ENUM_TO_BOOLEAN(E) ((E) ? GL_TRUE : GL_FALSE)
 720
 721
 722 #endif