reactos/dll/opengl/mesa/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 to GLfloat while preserving zero */
  58 #define BYTE_TO_FLOATZ(B)   ((B) == 0 ? 0.0F : BYTE_TO_FLOAT(B))
  59
  60
  61 /** Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0], texture/fb data */
  62 #define BYTE_TO_FLOAT_TEX(B)    ((B) == -128 ? -1.0F : (B) * (1.0F/127.0F))
  63
  64 /** Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127], texture/fb data */
  65 #define FLOAT_TO_BYTE_TEX(X)    CLAMP( (GLint) (127.0F * (X)), -128, 127 )
  66
  67 /** Convert GLushort in [0,65535] to GLfloat in [0.0,1.0] */
  68 #define USHORT_TO_FLOAT(S)  ((GLfloat) (S) * (1.0F / 65535.0F))
  69
  70 /** Convert GLfloat in [0.0,1.0] to GLushort in [0, 65535] */
  71 #define FLOAT_TO_USHORT(X)   ((GLuint) ((X) * 65535.0F))
  72
  73
  74 /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
  75 #define SHORT_TO_FLOAT(S)   ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
  76
  77 /** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767] */
  78 #define FLOAT_TO_SHORT(X)   ( (((GLint) (65535.0F * (X))) - 1) / 2 )
  79
  80 /** Convert GLshort to GLfloat while preserving zero */
  81 #define SHORT_TO_FLOATZ(S)   ((S) == 0 ? 0.0F : SHORT_TO_FLOAT(S))
  82
  83
  84 /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0], texture/fb data */
  85 #define SHORT_TO_FLOAT_TEX(S)    ((S) == -32768 ? -1.0F : (S) * (1.0F/32767.0F))
  86
  87 /** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767], texture/fb data */
  88 #define FLOAT_TO_SHORT_TEX(X)    ( (GLint) (32767.0F * (X)) )
  89
  90
  91 /** Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
  92 #define UINT_TO_FLOAT(U)    ((GLfloat) ((U) * (1.0F / 4294967295.0)))
  93
  94 /** Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
  95 #define FLOAT_TO_UINT(X)    ((GLuint) ((X) * 4294967295.0))
  96
  97
  98 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
  99 #define INT_TO_FLOAT(I)     ((GLfloat) ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0)))
 100
 101 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
 102 /* causes overflow:
 103 #define FLOAT_TO_INT(X)     ( (((GLint) (4294967294.0 * (X))) - 1) / 2 )
 104 */
 105 /* a close approximation: */
 106 #define FLOAT_TO_INT(X)     ( (GLint) (2147483647.0 * (X)) )
 107
 108 /** Convert GLfloat in [-1.0,1.0] to GLint64 in [-(1<<63),(1 << 63) -1] */
 109 #define FLOAT_TO_INT64(X)     ( (GLint64) (9223372036854775807.0 * (double)(X)) )
 110
 111
 112 /** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0], texture/fb data */
 113 #define INT_TO_FLOAT_TEX(I)    ((I) == -2147483648 ? -1.0F : (I) * (1.0F/2147483647.0))
 114
 115 /** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647], texture/fb data */
 116 #define FLOAT_TO_INT_TEX(X)    ( (GLint) (2147483647.0 * (X)) )
 117
 118
 119 #define BYTE_TO_UBYTE(b)   ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b)))
 120 #define SHORT_TO_UBYTE(s)  ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7)))
 121 #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8))
 122 #define INT_TO_UBYTE(i)    ((GLubyte) ((i) < 0 ? 0 : (GLubyte) ((i) >> 23)))
 123 #define UINT_TO_UBYTE(i)   ((GLubyte) ((i) >> 24))
 124
 125
 126 #define BYTE_TO_USHORT(b)  ((b) < 0 ? 0 : ((GLushort) (((b) * 65535) / 255)))
 127 #define UBYTE_TO_USHORT(b) (((GLushort) (b) << 8) | (GLushort) (b))
 128 #define SHORT_TO_USHORT(s) ((s) < 0 ? 0 : ((GLushort) (((s) * 65535 / 32767))))
 129 #define INT_TO_USHORT(i)   ((i) < 0 ? 0 : ((GLushort) ((i) >> 15)))
 130 #define UINT_TO_USHORT(i)  ((i) < 0 ? 0 : ((GLushort) ((i) >> 16)))
 131 #define UNCLAMPED_FLOAT_TO_USHORT(us, f)  \
 132         us = ( (GLushort) IROUND( CLAMP((f), 0.0F, 1.0F) * 65535.0F) )
 133 #define CLAMPED_FLOAT_TO_USHORT(us, f)  \
 134         us = ( (GLushort) IROUND( (f) * 65535.0F) )
 135
 136 #define UNCLAMPED_FLOAT_TO_SHORT(s, f)  \
 137         s = ( (GLshort) IROUND( CLAMP((f), -1.0F, 1.0F) * 32767.0F) )
 138
 139 /***
 140  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
 141  *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
 142  ***/
 143 #if defined(USE_IEEE) && !defined(DEBUG)
 144 #define IEEE_0996 0x3f7f0000    /* 0.996 or so */
 145 /* This function/macro is sensitive to precision.  Test very carefully
 146  * if you change it!
 147  */
 148 #define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)                                 \
 149         do {                                                            \
 150            fi_type __tmp;                                               \
 151            __tmp.f = (F);                                               \
 152            if (__tmp.i < 0)                                             \
 153               UB = (GLubyte) 0;                                         \
 154            else if (__tmp.i >= IEEE_0996)                               \
 155               UB = (GLubyte) 255;                                       \
 156            else {                                                       \
 157               __tmp.f = __tmp.f * (255.0f/256.0f) + 32768.0f;           \
 158               UB = (GLubyte) __tmp.i;                                   \
 159            }                                                            \
 160         } while (0)
 161 #define CLAMPED_FLOAT_TO_UBYTE(UB, F)                                   \
 162         do {                                                            \
 163            fi_type __tmp;                                               \
 164            __tmp.f = (F) * (255.0f/256.0f) + 32768.0f;                  \
 165            UB = (GLubyte) __tmp.i;                                      \
 166         } while (0)
 167 #else
 168 #define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \
 169         ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F))
 170 #define CLAMPED_FLOAT_TO_UBYTE(ub, f) \
 171         ub = ((GLubyte) IROUND((f) * 255.0F))
 172 #endif
 173
 174 /*@}*/
 175
 176
 177 /** Stepping a GLfloat pointer by a byte stride */
 178 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
 179 /** Stepping a GLuint pointer by a byte stride */
 180 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
 181 /** Stepping a GLubyte[4] pointer by a byte stride */
 182 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
 183 /** Stepping a GLfloat[4] pointer by a byte stride */
 184 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
 185 /** Stepping a \p t pointer by a byte stride */
 186 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
 187
 188
 189 /**********************************************************************/
 190 /** \name 4-element vector operations */
 191 /*@{*/
 192
 193 /** Zero */
 194 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
 195
 196 /** Test for equality */
 197 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
 198               (a)[1] == (b)[1] &&   \
 199               (a)[2] == (b)[2] &&   \
 200               (a)[3] == (b)[3])
 201
 202 /** Test for equality (unsigned bytes) */
 203 #if defined(__i386__)
 204 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
 205 #else
 206 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
 207 #endif
 208
 209 /** Copy a 4-element vector */
 210 #define COPY_4V( DST, SRC )         \
 211 do {                                \
 212    (DST)[0] = (SRC)[0];             \
 213    (DST)[1] = (SRC)[1];             \
 214    (DST)[2] = (SRC)[2];             \
 215    (DST)[3] = (SRC)[3];             \
 216 } while (0)
 217
 218 /** Copy a 4-element vector with cast */
 219 #define COPY_4V_CAST( DST, SRC, CAST )  \
 220 do {                                    \
 221    (DST)[0] = (CAST)(SRC)[0];           \
 222    (DST)[1] = (CAST)(SRC)[1];           \
 223    (DST)[2] = (CAST)(SRC)[2];           \
 224    (DST)[3] = (CAST)(SRC)[3];           \
 225 } while (0)
 226
 227 /** Copy a 4-element unsigned byte vector */
 228 #if defined(__i386__)
 229 #define COPY_4UBV(DST, SRC)                 \
 230 do {                                        \
 231    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
 232 } while (0)
 233 #else
 234 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
 235 #define COPY_4UBV(DST, SRC)         \
 236 do {                                \
 237    (DST)[0] = (SRC)[0];             \
 238    (DST)[1] = (SRC)[1];             \
 239    (DST)[2] = (SRC)[2];             \
 240    (DST)[3] = (SRC)[3];             \
 241 } while (0)
 242 #endif
 243
 244 /**
 245  * Copy a 4-element float vector
 246  * memcpy seems to be most efficient
 247  */
 248 #define COPY_4FV( DST, SRC )                  \
 249 do {                                          \
 250    memcpy(DST, SRC, sizeof(GLfloat) * 4);     \
 251 } while (0)
 252
 253 /** Copy \p SZ elements into a 4-element vector */
 254 #define COPY_SZ_4V(DST, SZ, SRC)  \
 255 do {                              \
 256    switch (SZ) {                  \
 257    case 4: (DST)[3] = (SRC)[3];   \
 258    case 3: (DST)[2] = (SRC)[2];   \
 259    case 2: (DST)[1] = (SRC)[1];   \
 260    case 1: (DST)[0] = (SRC)[0];   \
 261    }                              \
 262 } while(0)
 263
 264 /** Copy \p SZ elements into a homegeneous (4-element) vector, giving
 265  * default values to the remaining */
 266 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
 267 do {                                 \
 268       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
 269       COPY_SZ_4V( DST, SZ, SRC );    \
 270 } while (0)
 271
 272 /** Subtraction */
 273 #define SUB_4V( DST, SRCA, SRCB )           \
 274 do {                                        \
 275       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 276       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 277       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
 278       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
 279 } while (0)
 280
 281 /** Addition */
 282 #define ADD_4V( DST, SRCA, SRCB )           \
 283 do {                                        \
 284       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 285       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 286       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
 287       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
 288 } while (0)
 289
 290 /** Element-wise multiplication */
 291 #define SCALE_4V( DST, SRCA, SRCB )         \
 292 do {                                        \
 293       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 294       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 295       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
 296       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
 297 } while (0)
 298
 299 /** In-place addition */
 300 #define ACC_4V( DST, SRC )          \
 301 do {                                \
 302       (DST)[0] += (SRC)[0];         \
 303       (DST)[1] += (SRC)[1];         \
 304       (DST)[2] += (SRC)[2];         \
 305       (DST)[3] += (SRC)[3];         \
 306 } while (0)
 307
 308 /** Element-wise multiplication and addition */
 309 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
 310 do {                                        \
 311       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 312       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 313       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 314       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
 315 } while (0)
 316
 317 /** In-place scalar multiplication and addition */
 318 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
 319 do {                                        \
 320       (DST)[0] += S * (SRCB)[0];            \
 321       (DST)[1] += S * (SRCB)[1];            \
 322       (DST)[2] += S * (SRCB)[2];            \
 323       (DST)[3] += S * (SRCB)[3];            \
 324 } while (0)
 325
 326 /** Scalar multiplication */
 327 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
 328 do {                                    \
 329       (DST)[0] = S * (SRCB)[0];         \
 330       (DST)[1] = S * (SRCB)[1];         \
 331       (DST)[2] = S * (SRCB)[2];         \
 332       (DST)[3] = S * (SRCB)[3];         \
 333 } while (0)
 334
 335 /** In-place scalar multiplication */
 336 #define SELF_SCALE_SCALAR_4V( DST, S ) \
 337 do {                                   \
 338       (DST)[0] *= S;                   \
 339       (DST)[1] *= S;                   \
 340       (DST)[2] *= S;                   \
 341       (DST)[3] *= S;                   \
 342 } while (0)
 343
 344 /** Assignment */
 345 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
 346 do {                                    \
 347     V[0] = V0;                          \
 348     V[1] = V1;                          \
 349     V[2] = V2;                          \
 350     V[3] = V3;                          \
 351 } while(0)
 352
 353 /*@}*/
 354
 355
 356 /**********************************************************************/
 357 /** \name 3-element vector operations*/
 358 /*@{*/
 359
 360 /** Zero */
 361 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
 362
 363 /** Test for equality */
 364 #define TEST_EQ_3V(a,b)  \
 365    ((a)[0] == (b)[0] &&  \
 366     (a)[1] == (b)[1] &&  \
 367     (a)[2] == (b)[2])
 368
 369 /** Copy a 3-element vector */
 370 #define COPY_3V( DST, SRC )         \
 371 do {                                \
 372    (DST)[0] = (SRC)[0];             \
 373    (DST)[1] = (SRC)[1];             \
 374    (DST)[2] = (SRC)[2];             \
 375 } while (0)
 376
 377 /** Copy a 3-element vector with cast */
 378 #define COPY_3V_CAST( DST, SRC, CAST )  \
 379 do {                                    \
 380    (DST)[0] = (CAST)(SRC)[0];           \
 381    (DST)[1] = (CAST)(SRC)[1];           \
 382    (DST)[2] = (CAST)(SRC)[2];           \
 383 } while (0)
 384
 385 /** Copy a 3-element float vector */
 386 #define COPY_3FV( DST, SRC )        \
 387 do {                                \
 388    const GLfloat *_tmp = (SRC);     \
 389    (DST)[0] = _tmp[0];              \
 390    (DST)[1] = _tmp[1];              \
 391    (DST)[2] = _tmp[2];              \
 392 } while (0)
 393
 394 /** Subtraction */
 395 #define SUB_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 /** Addition */
 403 #define ADD_3V( DST, SRCA, SRCB )       \
 404 do {                                    \
 405       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
 406       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
 407       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
 408 } while (0)
 409
 410 /** In-place scalar multiplication */
 411 #define SCALE_3V( DST, SRCA, SRCB )     \
 412 do {                                    \
 413       (DST)[0] = (SRCA)[0] * (SRCB)[0]; \
 414       (DST)[1] = (SRCA)[1] * (SRCB)[1]; \
 415       (DST)[2] = (SRCA)[2] * (SRCB)[2]; \
 416 } while (0)
 417
 418 /** In-place element-wise multiplication */
 419 #define SELF_SCALE_3V( DST, SRC )   \
 420 do {                                \
 421       (DST)[0] *= (SRC)[0];         \
 422       (DST)[1] *= (SRC)[1];         \
 423       (DST)[2] *= (SRC)[2];         \
 424 } while (0)
 425
 426 /** In-place addition */
 427 #define ACC_3V( DST, SRC )          \
 428 do {                                \
 429       (DST)[0] += (SRC)[0];         \
 430       (DST)[1] += (SRC)[1];         \
 431       (DST)[2] += (SRC)[2];         \
 432 } while (0)
 433
 434 /** Element-wise multiplication and addition */
 435 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
 436 do {                                        \
 437       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 438       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 439       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
 440 } while (0)
 441
 442 /** Scalar multiplication */
 443 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
 444 do {                                    \
 445       (DST)[0] = S * (SRCB)[0];         \
 446       (DST)[1] = S * (SRCB)[1];         \
 447       (DST)[2] = S * (SRCB)[2];         \
 448 } while (0)
 449
 450 /** In-place scalar multiplication and addition */
 451 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
 452 do {                                        \
 453       (DST)[0] += S * (SRCB)[0];            \
 454       (DST)[1] += S * (SRCB)[1];            \
 455       (DST)[2] += S * (SRCB)[2];            \
 456 } while (0)
 457
 458 /** In-place scalar multiplication */
 459 #define SELF_SCALE_SCALAR_3V( DST, S ) \
 460 do {                                   \
 461       (DST)[0] *= S;                   \
 462       (DST)[1] *= S;                   \
 463       (DST)[2] *= S;                   \
 464 } while (0)
 465
 466 /** In-place scalar addition */
 467 #define ACC_SCALAR_3V( DST, S )     \
 468 do {                                \
 469       (DST)[0] += S;                \
 470       (DST)[1] += S;                \
 471       (DST)[2] += S;                \
 472 } while (0)
 473
 474 /** Assignment */
 475 #define ASSIGN_3V( V, V0, V1, V2 )  \
 476 do {                                \
 477     V[0] = V0;                      \
 478     V[1] = V1;                      \
 479     V[2] = V2;                      \
 480 } while(0)
 481
 482 /*@}*/
 483
 484
 485 /**********************************************************************/
 486 /** \name 2-element vector operations*/
 487 /*@{*/
 488
 489 /** Zero */
 490 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
 491
 492 /** Copy a 2-element vector */
 493 #define COPY_2V( DST, SRC )         \
 494 do {                        \
 495    (DST)[0] = (SRC)[0];             \
 496    (DST)[1] = (SRC)[1];             \
 497 } while (0)
 498
 499 /** Copy a 2-element vector with cast */
 500 #define COPY_2V_CAST( DST, SRC, CAST )      \
 501 do {                        \
 502    (DST)[0] = (CAST)(SRC)[0];           \
 503    (DST)[1] = (CAST)(SRC)[1];           \
 504 } while (0)
 505
 506 /** Copy a 2-element float vector */
 507 #define COPY_2FV( DST, SRC )            \
 508 do {                        \
 509    const GLfloat *_tmp = (SRC);         \
 510    (DST)[0] = _tmp[0];              \
 511    (DST)[1] = _tmp[1];              \
 512 } while (0)
 513
 514 /** Subtraction */
 515 #define SUB_2V( DST, SRCA, SRCB )       \
 516 do {                        \
 517       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
 518       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
 519 } while (0)
 520
 521 /** Addition */
 522 #define ADD_2V( DST, SRCA, SRCB )       \
 523 do {                        \
 524       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
 525       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
 526 } while (0)
 527
 528 /** In-place scalar multiplication */
 529 #define SCALE_2V( DST, SRCA, SRCB )     \
 530 do {                        \
 531       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
 532       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
 533 } while (0)
 534
 535 /** In-place addition */
 536 #define ACC_2V( DST, SRC )          \
 537 do {                        \
 538       (DST)[0] += (SRC)[0];         \
 539       (DST)[1] += (SRC)[1];         \
 540 } while (0)
 541
 542 /** Element-wise multiplication and addition */
 543 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
 544 do {                        \
 545       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
 546       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
 547 } while (0)
 548
 549 /** Scalar multiplication */
 550 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
 551 do {                        \
 552       (DST)[0] = S * (SRCB)[0];         \
 553       (DST)[1] = S * (SRCB)[1];         \
 554 } while (0)
 555
 556 /** In-place scalar multiplication and addition */
 557 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
 558 do {                        \
 559       (DST)[0] += S * (SRCB)[0];        \
 560       (DST)[1] += S * (SRCB)[1];        \
 561 } while (0)
 562
 563 /** In-place scalar multiplication */
 564 #define SELF_SCALE_SCALAR_2V( DST, S )      \
 565 do {                        \
 566       (DST)[0] *= S;                \
 567       (DST)[1] *= S;                \
 568 } while (0)
 569
 570 /** In-place scalar addition */
 571 #define ACC_SCALAR_2V( DST, S )         \
 572 do {                        \
 573       (DST)[0] += S;                \
 574       (DST)[1] += S;                \
 575 } while (0)
 576
 577 /** Assign scalers to short vectors */
 578 #define ASSIGN_2V( V, V0, V1 )  \
 579 do {                            \
 580     V[0] = V0;                  \
 581     V[1] = V1;                  \
 582 } while(0)
 583
 584 /*@}*/
 585
 586
 587 /** \name Linear interpolation macros */
 588 /*@{*/
 589
 590 /**
 591  * Linear interpolation
 592  *
 593  * \note \p OUT argument is evaluated twice!
 594  * \note Be wary of using *coord++ as an argument to any of these macros!
 595  */
 596 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
 597
 598 #define INTERP_F( t, dstf, outf, inf )      \
 599    dstf = LINTERP( t, outf, inf )
 600
 601 #define INTERP_4F( t, dst, out, in )        \
 602 do {                        \
 603    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 604    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 605    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 606    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
 607 } while (0)
 608
 609 #define INTERP_3F( t, dst, out, in )        \
 610 do {                        \
 611    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
 612    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
 613    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
 614 } while (0)
 615
 616 /*@}*/
 617
 618
 619
 620 /** Clamp X to [MIN,MAX] */
 621 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 622
 623 /** Minimum of two values: */
 624 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
 625
 626 /** Maximum of two values: */
 627 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
 628
 629 /** Minimum and maximum of three values: */
 630 #define MIN3( A, B, C ) ((A) < (B) ? MIN2(A, C) : MIN2(B, C))
 631 #define MAX3( A, B, C ) ((A) > (B) ? MAX2(A, C) : MAX2(B, C))
 632
 633 /** Dot product of two 2-element vectors */
 634 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
 635
 636 /** Dot product of two 3-element vectors */
 637 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
 638
 639 /** Dot product of two 4-element vectors */
 640 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
 641             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
 642
 643
 644 /** Cross product of two 3-element vectors */
 645 #define CROSS3(n, u, v)             \
 646 do {                        \
 647    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
 648    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
 649    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
 650 } while (0)
 651
 652
 653 /* Normalize a 3-element vector to unit length. */
 654 #define NORMALIZE_3FV( V )          \
 655 do {                        \
 656    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
 657    if (len) {                   \
 658       len = INV_SQRTF(len);         \
 659       (V)[0] = (GLfloat) ((V)[0] * len);    \
 660       (V)[1] = (GLfloat) ((V)[1] * len);    \
 661       (V)[2] = (GLfloat) ((V)[2] * len);    \
 662    }                        \
 663 } while(0)
 664
 665 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
 666 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
 667
 668 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
 669 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
 670
 671
 672 /** Compute ceiling of integer quotient of A divided by B. */
 673 #define CEILING( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
 674
 675
 676 /** casts to silence warnings with some compilers */
 677 #define ENUM_TO_INT(E)     ((GLint)(E))
 678 #define ENUM_TO_FLOAT(E)   ((GLfloat)(GLint)(E))
 679 #define ENUM_TO_DOUBLE(E)  ((GLdouble)(GLint)(E))
 680 #define ENUM_TO_BOOLEAN(E) ((E) ? GL_TRUE : GL_FALSE)
 681
 682
 683 #endif