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00001 
00006 /*
00007  * Mesa 3-D graphics library
00008  * Version:  6.5.2
00009  *
00010  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
00011  *
00012  * Permission is hereby granted, free of charge, to any person obtaining a
00013  * copy of this software and associated documentation files (the "Software"),
00014  * to deal in the Software without restriction, including without limitation
00015  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00016  * and/or sell copies of the Software, and to permit persons to whom the
00017  * Software is furnished to do so, subject to the following conditions:
00018  *
00019  * The above copyright notice and this permission notice shall be included
00020  * in all copies or substantial portions of the Software.
00021  *
00022  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00023  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00024  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
00025  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
00026  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
00027  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00028  */
00029 
00030 
00031 #ifndef MACROS_H
00032 #define MACROS_H
00033 
00034 #include "imports.h"
00035 
00036 
00041 
00043 extern GLfloat _mesa_ubyte_to_float_color_tab[256];
00044 #define UBYTE_TO_FLOAT(u) _mesa_ubyte_to_float_color_tab[(unsigned int)(u)]
00045 
00047 #define FLOAT_TO_UBYTE(X)   ((GLubyte) (GLint) ((X) * 255.0F))
00048 
00049 
00051 #define BYTE_TO_FLOAT(B)    ((2.0F * (B) + 1.0F) * (1.0F/255.0F))
00052 
00054 #define FLOAT_TO_BYTE(X)    ( (((GLint) (255.0F * (X))) - 1) / 2 )
00055 
00056 
00058 #define USHORT_TO_FLOAT(S)  ((GLfloat) (S) * (1.0F / 65535.0F))
00059 
00061 #define SHORT_TO_FLOAT(S)   ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
00062 
00064 #define FLOAT_TO_SHORT(X)   ( (((GLint) (65535.0F * (X))) - 1) / 2 )
00065 
00066 
00068 #define UINT_TO_FLOAT(U)    ((GLfloat) (U) * (1.0F / 4294967295.0F))
00069 
00071 #define FLOAT_TO_UINT(X)    ((GLuint) ((X) * 4294967295.0))
00072 
00073 
00075 #define INT_TO_FLOAT(I)     ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0F))
00076 
00078 /* causes overflow:
00079 #define FLOAT_TO_INT(X)     ( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
00080 */
00081 /* a close approximation: */
00082 #define FLOAT_TO_INT(X)     ( (GLint) (2147483647.0 * (X)) )
00083 
00084 
00085 #define BYTE_TO_UBYTE(b)   ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b)))
00086 #define SHORT_TO_UBYTE(s)  ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7)))
00087 #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8))
00088 #define INT_TO_UBYTE(i)    ((GLubyte) ((i) < 0 ? 0 : (GLubyte) ((i) >> 23)))
00089 #define UINT_TO_UBYTE(i)   ((GLubyte) ((i) >> 24))
00090 
00091 
00092 #define BYTE_TO_USHORT(b)  ((b) < 0 ? 0 : ((GLushort) (((b) * 65535) / 255)))
00093 #define UBYTE_TO_USHORT(b) (((GLushort) (b) << 8) | (GLushort) (b))
00094 #define SHORT_TO_USHORT(s) ((s) < 0 ? 0 : ((GLushort) (((s) * 65535 / 32767))))
00095 #define INT_TO_USHORT(i)   ((i) < 0 ? 0 : ((GLushort) ((i) >> 15)))
00096 #define UINT_TO_USHORT(i)  ((i) < 0 ? 0 : ((GLushort) ((i) >> 16)))
00097 #define UNCLAMPED_FLOAT_TO_USHORT(us, f)  \
00098         us = ( (GLushort) IROUND( CLAMP((f), 0.0, 1.0) * 65535.0F) )
00099 #define CLAMPED_FLOAT_TO_USHORT(us, f)  \
00100         us = ( (GLushort) IROUND( (f) * 65535.0F) )
00101 
00106 #define STRIDE_F(p, i)  (p = (GLfloat *)((GLubyte *)p + i))
00107 
00108 #define STRIDE_UI(p, i)  (p = (GLuint *)((GLubyte *)p + i))
00109 
00110 #define STRIDE_4UB(p, i)  (p = (GLubyte (*)[4])((GLubyte *)p + i))
00111 
00112 #define STRIDE_4F(p, i)  (p = (GLfloat (*)[4])((GLubyte *)p + i))
00113 
00114 #define STRIDE_4CHAN(p, i)  (p = (GLchan (*)[4])((GLubyte *)p + i))
00115 
00116 #define STRIDE_CHAN(p, i)  (p = (GLchan *)((GLubyte *)p + i))
00117 
00118 #define STRIDE_T(p, t, i)  (p = (t)((GLubyte *)p + i))
00119 
00120 
00121 /**********************************************************************/
00124 
00126 #define ZERO_4V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = (DST)[3] = 0
00127 
00129 #define TEST_EQ_4V(a,b)  ((a)[0] == (b)[0] &&   \
00130               (a)[1] == (b)[1] &&   \
00131               (a)[2] == (b)[2] &&   \
00132               (a)[3] == (b)[3])
00133 
00135 #if defined(__i386__)
00136 #define TEST_EQ_4UBV(DST, SRC) *((GLuint*)(DST)) == *((GLuint*)(SRC))
00137 #else
00138 #define TEST_EQ_4UBV(DST, SRC) TEST_EQ_4V(DST, SRC)
00139 #endif
00140 
00142 #define COPY_4V( DST, SRC )         \
00143 do {                                \
00144    (DST)[0] = (SRC)[0];             \
00145    (DST)[1] = (SRC)[1];             \
00146    (DST)[2] = (SRC)[2];             \
00147    (DST)[3] = (SRC)[3];             \
00148 } while (0)
00149 
00151 #define COPY_4V_CAST( DST, SRC, CAST )  \
00152 do {                                    \
00153    (DST)[0] = (CAST)(SRC)[0];           \
00154    (DST)[1] = (CAST)(SRC)[1];           \
00155    (DST)[2] = (CAST)(SRC)[2];           \
00156    (DST)[3] = (CAST)(SRC)[3];           \
00157 } while (0)
00158 
00160 #if defined(__i386__)
00161 #define COPY_4UBV(DST, SRC)                 \
00162 do {                                        \
00163    *((GLuint*)(DST)) = *((GLuint*)(SRC));   \
00164 } while (0)
00165 #else
00166 /* The GLuint cast might fail if DST or SRC are not dword-aligned (RISC) */
00167 #define COPY_4UBV(DST, SRC)         \
00168 do {                                \
00169    (DST)[0] = (SRC)[0];             \
00170    (DST)[1] = (SRC)[1];             \
00171    (DST)[2] = (SRC)[2];             \
00172    (DST)[3] = (SRC)[3];             \
00173 } while (0)
00174 #endif
00175 
00180 #define COPY_4FV( DST, SRC )                  \
00181 do {                                          \
00182    const GLuint *_s = (const GLuint *) (SRC); \
00183    GLuint *_d = (GLuint *) (DST);             \
00184    _d[0] = _s[0];                             \
00185    _d[1] = _s[1];                             \
00186    _d[2] = _s[2];                             \
00187    _d[3] = _s[3];                             \
00188 } while (0)
00189 
00191 #define COPY_SZ_4V(DST, SZ, SRC)  \
00192 do {                              \
00193    switch (SZ) {                  \
00194    case 4: (DST)[3] = (SRC)[3];   \
00195    case 3: (DST)[2] = (SRC)[2];   \
00196    case 2: (DST)[1] = (SRC)[1];   \
00197    case 1: (DST)[0] = (SRC)[0];   \
00198    }                              \
00199 } while(0)
00200 
00203 #define COPY_CLEAN_4V(DST, SZ, SRC)  \
00204 do {                                 \
00205       ASSIGN_4V( DST, 0, 0, 0, 1 );  \
00206       COPY_SZ_4V( DST, SZ, SRC );    \
00207 } while (0)
00208 
00210 #define SUB_4V( DST, SRCA, SRCB )           \
00211 do {                                        \
00212       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
00213       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
00214       (DST)[2] = (SRCA)[2] - (SRCB)[2];     \
00215       (DST)[3] = (SRCA)[3] - (SRCB)[3];     \
00216 } while (0)
00217 
00219 #define ADD_4V( DST, SRCA, SRCB )           \
00220 do {                                        \
00221       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
00222       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
00223       (DST)[2] = (SRCA)[2] + (SRCB)[2];     \
00224       (DST)[3] = (SRCA)[3] + (SRCB)[3];     \
00225 } while (0)
00226 
00228 #define SCALE_4V( DST, SRCA, SRCB )         \
00229 do {                                        \
00230       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
00231       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
00232       (DST)[2] = (SRCA)[2] * (SRCB)[2];     \
00233       (DST)[3] = (SRCA)[3] * (SRCB)[3];     \
00234 } while (0)
00235 
00237 #define ACC_4V( DST, SRC )          \
00238 do {                                \
00239       (DST)[0] += (SRC)[0];         \
00240       (DST)[1] += (SRC)[1];         \
00241       (DST)[2] += (SRC)[2];         \
00242       (DST)[3] += (SRC)[3];         \
00243 } while (0)
00244 
00246 #define ACC_SCALE_4V( DST, SRCA, SRCB )     \
00247 do {                                        \
00248       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
00249       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
00250       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
00251       (DST)[3] += (SRCA)[3] * (SRCB)[3];    \
00252 } while (0)
00253 
00255 #define ACC_SCALE_SCALAR_4V( DST, S, SRCB ) \
00256 do {                                        \
00257       (DST)[0] += S * (SRCB)[0];            \
00258       (DST)[1] += S * (SRCB)[1];            \
00259       (DST)[2] += S * (SRCB)[2];            \
00260       (DST)[3] += S * (SRCB)[3];            \
00261 } while (0)
00262 
00264 #define SCALE_SCALAR_4V( DST, S, SRCB ) \
00265 do {                                    \
00266       (DST)[0] = S * (SRCB)[0];         \
00267       (DST)[1] = S * (SRCB)[1];         \
00268       (DST)[2] = S * (SRCB)[2];         \
00269       (DST)[3] = S * (SRCB)[3];         \
00270 } while (0)
00271 
00273 #define SELF_SCALE_SCALAR_4V( DST, S ) \
00274 do {                                   \
00275       (DST)[0] *= S;                   \
00276       (DST)[1] *= S;                   \
00277       (DST)[2] *= S;                   \
00278       (DST)[3] *= S;                   \
00279 } while (0)
00280 
00282 #define ASSIGN_4V( V, V0, V1, V2, V3 )  \
00283 do {                                    \
00284     V[0] = V0;                          \
00285     V[1] = V1;                          \
00286     V[2] = V2;                          \
00287     V[3] = V3;                          \
00288 } while(0)
00289 
00293 /**********************************************************************/
00296 
00298 #define ZERO_3V( DST )  (DST)[0] = (DST)[1] = (DST)[2] = 0
00299 
00301 #define TEST_EQ_3V(a,b)  \
00302    ((a)[0] == (b)[0] &&  \
00303     (a)[1] == (b)[1] &&  \
00304     (a)[2] == (b)[2])
00305 
00307 #define COPY_3V( DST, SRC )         \
00308 do {                                \
00309    (DST)[0] = (SRC)[0];             \
00310    (DST)[1] = (SRC)[1];             \
00311    (DST)[2] = (SRC)[2];             \
00312 } while (0)
00313 
00315 #define COPY_3V_CAST( DST, SRC, CAST )  \
00316 do {                                    \
00317    (DST)[0] = (CAST)(SRC)[0];           \
00318    (DST)[1] = (CAST)(SRC)[1];           \
00319    (DST)[2] = (CAST)(SRC)[2];           \
00320 } while (0)
00321 
00323 #define COPY_3FV( DST, SRC )        \
00324 do {                                \
00325    const GLfloat *_tmp = (SRC);     \
00326    (DST)[0] = _tmp[0];              \
00327    (DST)[1] = _tmp[1];              \
00328    (DST)[2] = _tmp[2];              \
00329 } while (0)
00330 
00332 #define SUB_3V( DST, SRCA, SRCB )        \
00333 do {                                     \
00334       (DST)[0] = (SRCA)[0] - (SRCB)[0];  \
00335       (DST)[1] = (SRCA)[1] - (SRCB)[1];  \
00336       (DST)[2] = (SRCA)[2] - (SRCB)[2];  \
00337 } while (0)
00338 
00340 #define ADD_3V( DST, SRCA, SRCB )       \
00341 do {                                    \
00342       (DST)[0] = (SRCA)[0] + (SRCB)[0]; \
00343       (DST)[1] = (SRCA)[1] + (SRCB)[1]; \
00344       (DST)[2] = (SRCA)[2] + (SRCB)[2]; \
00345 } while (0)
00346 
00348 #define SCALE_3V( DST, SRCA, SRCB )     \
00349 do {                                    \
00350       (DST)[0] = (SRCA)[0] * (SRCB)[0]; \
00351       (DST)[1] = (SRCA)[1] * (SRCB)[1]; \
00352       (DST)[2] = (SRCA)[2] * (SRCB)[2]; \
00353 } while (0)
00354 
00356 #define SELF_SCALE_3V( DST, SRC )   \
00357 do {                                \
00358       (DST)[0] *= (SRC)[0];         \
00359       (DST)[1] *= (SRC)[1];         \
00360       (DST)[2] *= (SRC)[2];         \
00361 } while (0)
00362 
00364 #define ACC_3V( DST, SRC )          \
00365 do {                                \
00366       (DST)[0] += (SRC)[0];         \
00367       (DST)[1] += (SRC)[1];         \
00368       (DST)[2] += (SRC)[2];         \
00369 } while (0)
00370 
00372 #define ACC_SCALE_3V( DST, SRCA, SRCB )     \
00373 do {                                        \
00374       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
00375       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
00376       (DST)[2] += (SRCA)[2] * (SRCB)[2];    \
00377 } while (0)
00378 
00380 #define SCALE_SCALAR_3V( DST, S, SRCB ) \
00381 do {                                    \
00382       (DST)[0] = S * (SRCB)[0];         \
00383       (DST)[1] = S * (SRCB)[1];         \
00384       (DST)[2] = S * (SRCB)[2];         \
00385 } while (0)
00386 
00388 #define ACC_SCALE_SCALAR_3V( DST, S, SRCB ) \
00389 do {                                        \
00390       (DST)[0] += S * (SRCB)[0];            \
00391       (DST)[1] += S * (SRCB)[1];            \
00392       (DST)[2] += S * (SRCB)[2];            \
00393 } while (0)
00394 
00396 #define SELF_SCALE_SCALAR_3V( DST, S ) \
00397 do {                                   \
00398       (DST)[0] *= S;                   \
00399       (DST)[1] *= S;                   \
00400       (DST)[2] *= S;                   \
00401 } while (0)
00402 
00404 #define ACC_SCALAR_3V( DST, S )     \
00405 do {                                \
00406       (DST)[0] += S;                \
00407       (DST)[1] += S;                \
00408       (DST)[2] += S;                \
00409 } while (0)
00410 
00412 #define ASSIGN_3V( V, V0, V1, V2 )  \
00413 do {                                \
00414     V[0] = V0;                      \
00415     V[1] = V1;                      \
00416     V[2] = V2;                      \
00417 } while(0)
00418 
00422 /**********************************************************************/
00425 
00427 #define ZERO_2V( DST )  (DST)[0] = (DST)[1] = 0
00428 
00430 #define COPY_2V( DST, SRC )         \
00431 do {                        \
00432    (DST)[0] = (SRC)[0];             \
00433    (DST)[1] = (SRC)[1];             \
00434 } while (0)
00435 
00437 #define COPY_2V_CAST( DST, SRC, CAST )      \
00438 do {                        \
00439    (DST)[0] = (CAST)(SRC)[0];           \
00440    (DST)[1] = (CAST)(SRC)[1];           \
00441 } while (0)
00442 
00444 #define COPY_2FV( DST, SRC )            \
00445 do {                        \
00446    const GLfloat *_tmp = (SRC);         \
00447    (DST)[0] = _tmp[0];              \
00448    (DST)[1] = _tmp[1];              \
00449 } while (0)
00450 
00452 #define SUB_2V( DST, SRCA, SRCB )       \
00453 do {                        \
00454       (DST)[0] = (SRCA)[0] - (SRCB)[0];     \
00455       (DST)[1] = (SRCA)[1] - (SRCB)[1];     \
00456 } while (0)
00457 
00459 #define ADD_2V( DST, SRCA, SRCB )       \
00460 do {                        \
00461       (DST)[0] = (SRCA)[0] + (SRCB)[0];     \
00462       (DST)[1] = (SRCA)[1] + (SRCB)[1];     \
00463 } while (0)
00464 
00466 #define SCALE_2V( DST, SRCA, SRCB )     \
00467 do {                        \
00468       (DST)[0] = (SRCA)[0] * (SRCB)[0];     \
00469       (DST)[1] = (SRCA)[1] * (SRCB)[1];     \
00470 } while (0)
00471 
00473 #define ACC_2V( DST, SRC )          \
00474 do {                        \
00475       (DST)[0] += (SRC)[0];         \
00476       (DST)[1] += (SRC)[1];         \
00477 } while (0)
00478 
00480 #define ACC_SCALE_2V( DST, SRCA, SRCB )     \
00481 do {                        \
00482       (DST)[0] += (SRCA)[0] * (SRCB)[0];    \
00483       (DST)[1] += (SRCA)[1] * (SRCB)[1];    \
00484 } while (0)
00485 
00487 #define SCALE_SCALAR_2V( DST, S, SRCB )     \
00488 do {                        \
00489       (DST)[0] = S * (SRCB)[0];         \
00490       (DST)[1] = S * (SRCB)[1];         \
00491 } while (0)
00492 
00494 #define ACC_SCALE_SCALAR_2V( DST, S, SRCB ) \
00495 do {                        \
00496       (DST)[0] += S * (SRCB)[0];        \
00497       (DST)[1] += S * (SRCB)[1];        \
00498 } while (0)
00499 
00501 #define SELF_SCALE_SCALAR_2V( DST, S )      \
00502 do {                        \
00503       (DST)[0] *= S;                \
00504       (DST)[1] *= S;                \
00505 } while (0)
00506 
00508 #define ACC_SCALAR_2V( DST, S )         \
00509 do {                        \
00510       (DST)[0] += S;                \
00511       (DST)[1] += S;                \
00512 } while (0)
00513 
00515 #define ASSIGN_2V( V, V0, V1 )  \
00516 do {                \
00517     V[0] = V0;          \
00518     V[1] = V1;          \
00519 } while(0)
00520 
00526 
00533 #define LINTERP(T, OUT, IN) ((OUT) + (T) * ((IN) - (OUT)))
00534 
00535 /* Can do better with integer math
00536  */
00537 #define INTERP_UB( t, dstub, outub, inub )  \
00538 do {                        \
00539    GLfloat inf = UBYTE_TO_FLOAT( inub );    \
00540    GLfloat outf = UBYTE_TO_FLOAT( outub );  \
00541    GLfloat dstf = LINTERP( t, outf, inf );  \
00542    UNCLAMPED_FLOAT_TO_UBYTE( dstub, dstf ); \
00543 } while (0)
00544 
00545 #define INTERP_CHAN( t, dstc, outc, inc )   \
00546 do {                        \
00547    GLfloat inf = CHAN_TO_FLOAT( inc );      \
00548    GLfloat outf = CHAN_TO_FLOAT( outc );    \
00549    GLfloat dstf = LINTERP( t, outf, inf );  \
00550    UNCLAMPED_FLOAT_TO_CHAN( dstc, dstf );   \
00551 } while (0)
00552 
00553 #define INTERP_UI( t, dstui, outui, inui )  \
00554    dstui = (GLuint) (GLint) LINTERP( (t), (GLfloat) (outui), (GLfloat) (inui) )
00555 
00556 #define INTERP_F( t, dstf, outf, inf )      \
00557    dstf = LINTERP( t, outf, inf )
00558 
00559 #define INTERP_4F( t, dst, out, in )        \
00560 do {                        \
00561    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
00562    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
00563    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
00564    dst[3] = LINTERP( (t), (out)[3], (in)[3] );  \
00565 } while (0)
00566 
00567 #define INTERP_3F( t, dst, out, in )        \
00568 do {                        \
00569    dst[0] = LINTERP( (t), (out)[0], (in)[0] );  \
00570    dst[1] = LINTERP( (t), (out)[1], (in)[1] );  \
00571    dst[2] = LINTERP( (t), (out)[2], (in)[2] );  \
00572 } while (0)
00573 
00574 #define INTERP_4CHAN( t, dst, out, in )         \
00575 do {                            \
00576    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
00577    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
00578    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
00579    INTERP_CHAN( (t), (dst)[3], (out)[3], (in)[3] ); \
00580 } while (0)
00581 
00582 #define INTERP_3CHAN( t, dst, out, in )         \
00583 do {                            \
00584    INTERP_CHAN( (t), (dst)[0], (out)[0], (in)[0] ); \
00585    INTERP_CHAN( (t), (dst)[1], (out)[1], (in)[1] ); \
00586    INTERP_CHAN( (t), (dst)[2], (out)[2], (in)[2] ); \
00587 } while (0)
00588 
00589 #define INTERP_SZ( t, vec, to, out, in, sz )                \
00590 do {                                    \
00591    switch (sz) {                            \
00592    case 4: vec[to][3] = LINTERP( (t), (vec)[out][3], (vec)[in][3] );    \
00593    case 3: vec[to][2] = LINTERP( (t), (vec)[out][2], (vec)[in][2] );    \
00594    case 2: vec[to][1] = LINTERP( (t), (vec)[out][1], (vec)[in][1] );    \
00595    case 1: vec[to][0] = LINTERP( (t), (vec)[out][0], (vec)[in][0] );    \
00596    }                                    \
00597 } while(0)
00598 
00604 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
00605 
00607 #define CLAMP_SELF(x, mn, mx)  \
00608    ( (x)<(mn) ? ((x) = (mn)) : ((x)>(mx) ? ((x)=(mx)) : (x)) )
00609 
00610 
00611 
00613 #define MIN2( A, B )   ( (A)<(B) ? (A) : (B) )
00614 
00616 #define MAX2( A, B )   ( (A)>(B) ? (A) : (B) )
00617 
00619 #define DOT2( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] )
00620 
00622 #define DOT3( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + (a)[2]*(b)[2] )
00623 
00625 #define DOT4( a, b )  ( (a)[0]*(b)[0] + (a)[1]*(b)[1] + \
00626             (a)[2]*(b)[2] + (a)[3]*(b)[3] )
00627 
00629 #define DOT4V(v,a,b,c,d) (v[0]*(a) + v[1]*(b) + v[2]*(c) + v[3]*(d))
00630 
00631 
00633 #define CROSS3(n, u, v)             \
00634 do {                        \
00635    (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1];  \
00636    (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2];  \
00637    (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0];  \
00638 } while (0)
00639 
00640 
00641 /* Normalize a 3-element vector to unit length. */
00642 #define NORMALIZE_3FV( V )          \
00643 do {                        \
00644    GLfloat len = (GLfloat) LEN_SQUARED_3FV(V);  \
00645    if (len) {                   \
00646       len = INV_SQRTF(len);         \
00647       (V)[0] = (GLfloat) ((V)[0] * len);    \
00648       (V)[1] = (GLfloat) ((V)[1] * len);    \
00649       (V)[2] = (GLfloat) ((V)[2] * len);    \
00650    }                        \
00651 } while(0)
00652 
00653 #define LEN_3FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2]))
00654 #define LEN_2FV( V ) (SQRTF((V)[0]*(V)[0]+(V)[1]*(V)[1]))
00655 
00656 #define LEN_SQUARED_3FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1]+(V)[2]*(V)[2])
00657 #define LEN_SQUARED_2FV( V ) ((V)[0]*(V)[0]+(V)[1]*(V)[1])
00658 
00659 
00661 #define ENUM_TO_INT(E)     ((GLint)(E))
00662 #define ENUM_TO_FLOAT(E)   ((GLfloat)(GLint)(E))
00663 #define ENUM_TO_DOUBLE(E)  ((GLdouble)(GLint)(E))
00664 #define ENUM_TO_BOOLEAN(E) ((E) ? GL_TRUE : GL_FALSE)
00665 
00666 
00667 #endif
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