src/mesa/main/imports.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file imports.h
  28  * Standard C library function wrappers.
  29  *
  30  * This file provides wrappers for all the standard C library functions
  31  * like malloc(), free(), printf(), getenv(), etc.
  32  */
  33
  34
  35 #ifndef IMPORTS_H
  36 #define IMPORTS_H
  37
  38
  39 /* XXX some of the stuff in glheader.h should be moved into this file.
  40  */
  41 #include "glheader.h"
  42 #include <GL/internal/glcore.h>
  43
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49
  50 /**********************************************************************/
  51 /** \name General macros */
  52 /*@{*/
  53
  54 #ifndef NULL
  55 #define NULL 0
  56 #endif
  57
  58
  59 /** gcc -pedantic warns about long string literals, LONGSTRING silences that */
  60 #if !defined(__GNUC__) || (__GNUC__ < 2) || \
  61     ((__GNUC__ == 2) && (__GNUC_MINOR__ <= 7))
  62 # define LONGSTRING
  63 #else
  64 # define LONGSTRING __extension__
  65 #endif
  66
  67 /*@}*/
  68
  69
  70 /**********************************************************************/
  71 /** Memory macros */
  72 /*@{*/
  73
  74 /** Allocate \p BYTES bytes */
  75 #define MALLOC(BYTES)      _mesa_malloc(BYTES)
  76 /** Allocate and zero \p BYTES bytes */
  77 #define CALLOC(BYTES)      _mesa_calloc(BYTES)
  78 /** Allocate a structure of type \p T */
  79 #define MALLOC_STRUCT(T)   (struct T *) _mesa_malloc(sizeof(struct T))
  80 /** Allocate and zero a structure of type \p T */
  81 #define CALLOC_STRUCT(T)   (struct T *) _mesa_calloc(sizeof(struct T))
  82 /** Free memory */
  83 #define FREE(PTR)          _mesa_free(PTR)
  84
  85 /** Allocate \p BYTES aligned at \p N bytes */
  86 #define ALIGN_MALLOC(BYTES, N)     _mesa_align_malloc(BYTES, N)
  87 /** Allocate and zero \p BYTES bytes aligned at \p N bytes */
  88 #define ALIGN_CALLOC(BYTES, N)     _mesa_align_calloc(BYTES, N)
  89 /** Allocate a structure of type \p T aligned at \p N bytes */
  90 #define ALIGN_MALLOC_STRUCT(T, N)  (struct T *) _mesa_align_malloc(sizeof(struct T), N)
  91 /** Allocate and zero a structure of type \p T aligned at \p N bytes */
  92 #define ALIGN_CALLOC_STRUCT(T, N)  (struct T *) _mesa_align_calloc(sizeof(struct T), N)
  93 /** Free aligned memory */
  94 #define ALIGN_FREE(PTR)            _mesa_align_free(PTR)
  95
  96 /** Copy \p BYTES bytes from \p SRC into \p DST */
  97 #define MEMCPY( DST, SRC, BYTES)   _mesa_memcpy(DST, SRC, BYTES)
  98 /** Set \p N bytes in \p DST to \p VAL */
  99 #define MEMSET( DST, VAL, N )      _mesa_memset(DST, VAL, N)
 100
 101 /*@}*/
 102
 103
 104 /*
 105  * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
 106  * as offsets into buffer stores.  Since the vertex array pointer and
 107  * buffer store pointer are both pointers and we need to add them, we use
 108  * this macro.
 109  * Both pointers/offsets are expressed in bytes.
 110  */
 111 #define ADD_POINTERS(A, B)  ( (GLubyte *) (A) + (uintptr_t) (B) )
 112
 113
 114 /**
 115  * Sometimes we treat GLfloats as GLints.  On x86 systems, moving a float
 116  * as a int (thereby using integer registers instead of FP registers) is
 117  * a performance win.  Typically, this can be done with ordinary casts.
 118  * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
 119  * these casts generate warnings.
 120  * The following union typedef is used to solve that.
 121  */
 122 typedef union { GLfloat f; GLint i; } fi_type;
 123
 124
 125
 126 /**********************************************************************
 127  * Math macros
 128  */
 129
 130 #define MAX_GLUSHORT    0xffff
 131 #define MAX_GLUINT      0xffffffff
 132
 133 #ifndef M_PI
 134 #define M_PI (3.1415926536)
 135 #endif
 136
 137 #ifndef M_E
 138 #define M_E (2.7182818284590452354)
 139 #endif
 140
 141 #ifndef ONE_DIV_LN2
 142 #define ONE_DIV_LN2 (1.442695040888963456)
 143 #endif
 144
 145 #ifndef ONE_DIV_SQRT_LN2
 146 #define ONE_DIV_SQRT_LN2 (1.201122408786449815)
 147 #endif
 148
 149 #ifndef FLT_MAX_EXP
 150 #define FLT_MAX_EXP 128
 151 #endif
 152
 153 /* Degrees to radians conversion: */
 154 #define DEG2RAD (M_PI/180.0)
 155
 156
 157 /***
 158  *** USE_IEEE: Determine if we're using IEEE floating point
 159  ***/
 160 #if defined(__i386__) || defined(__386__) || defined(__sparc__) || \
 161     defined(__s390x__) || defined(__powerpc__) || \
 162     defined(__x86_64__) || \
 163     defined(ia64) || defined(__ia64__) || \
 164     defined(__hppa__) || defined(hpux) || \
 165     defined(__mips) || defined(_MIPS_ARCH) || \
 166     defined(__arm__) || \
 167     defined(__sh__) || defined(__m32r__) || \
 168     (defined(__sun) && defined(_IEEE_754)) || \
 169     (defined(__alpha__) && (defined(__IEEE_FLOAT) || !defined(VMS)))
 170 #define USE_IEEE
 171 #define IEEE_ONE 0x3f800000
 172 #endif
 173
 174
 175 /***
 176  *** SQRTF: single-precision square root
 177  ***/
 178 #if 0 /* _mesa_sqrtf() not accurate enough - temporarily disabled */
 179 #  define SQRTF(X)  _mesa_sqrtf(X)
 180 #else
 181 #  define SQRTF(X)  (float) sqrt((float) (X))
 182 #endif
 183
 184
 185 /***
 186  *** INV_SQRTF: single-precision inverse square root
 187  ***/
 188 #if 0
 189 #define INV_SQRTF(X) _mesa_inv_sqrt(X)
 190 #else
 191 #define INV_SQRTF(X) (1.0F / SQRTF(X))  /* this is faster on a P4 */
 192 #endif
 193
 194
 195 /***
 196  *** LOG2: Log base 2 of float
 197  ***/
 198 #ifdef USE_IEEE
 199 #if 0
 200 /* This is pretty fast, but not accurate enough (only 2 fractional bits).
 201  * Based on code from http://www.stereopsis.com/log2.html
 202  */
 203 static INLINE GLfloat LOG2(GLfloat x)
 204 {
 205    const GLfloat y = x * x * x * x;
 206    const GLuint ix = *((GLuint *) &y);
 207    const GLuint exp = (ix >> 23) & 0xFF;
 208    const GLint log2 = ((GLint) exp) - 127;
 209    return (GLfloat) log2 * (1.0 / 4.0);  /* 4, because of x^4 above */
 210 }
 211 #endif
 212 /* Pretty fast, and accurate.
 213  * Based on code from http://www.flipcode.com/totd/
 214  */
 215 static INLINE GLfloat LOG2(GLfloat val)
 216 {
 217    fi_type num;
 218    GLint log_2;
 219    num.f = val;
 220    log_2 = ((num.i >> 23) & 255) - 128;
 221    num.i &= ~(255 << 23);
 222    num.i += 127 << 23;
 223    num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
 224    return num.f + log_2;
 225 }
 226 #else
 227 /*
 228  * NOTE: log_base_2(x) = log(x) / log(2)
 229  * NOTE: 1.442695 = 1/log(2).
 230  */
 231 #define LOG2(x)  ((GLfloat) (log(x) * 1.442695F))
 232 #endif
 233
 234
 235 /***
 236  *** IS_INF_OR_NAN: test if float is infinite or NaN
 237  ***/
 238 #ifdef USE_IEEE
 239 static INLINE int IS_INF_OR_NAN( float x )
 240 {
 241    fi_type tmp;
 242    tmp.f = x;
 243    return !(int)((unsigned int)((tmp.i & 0x7fffffff)-0x7f800000) >> 31);
 244 }
 245 #elif defined(isfinite)
 246 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 247 #elif defined(finite)
 248 #define IS_INF_OR_NAN(x)        (!finite(x))
 249 #elif defined(__VMS)
 250 #define IS_INF_OR_NAN(x)        (!finite(x))
 251 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 252 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 253 #else
 254 #define IS_INF_OR_NAN(x)        (!finite(x))
 255 #endif
 256
 257
 258 /***
 259  *** IS_NEGATIVE: test if float is negative
 260  ***/
 261 #if defined(USE_IEEE)
 262 static INLINE int GET_FLOAT_BITS( float x )
 263 {
 264    fi_type fi;
 265    fi.f = x;
 266    return fi.i;
 267 }
 268 #define IS_NEGATIVE(x) (GET_FLOAT_BITS(x) < 0)
 269 #else
 270 #define IS_NEGATIVE(x) (x < 0.0F)
 271 #endif
 272
 273
 274 /***
 275  *** DIFFERENT_SIGNS: test if two floats have opposite signs
 276  ***/
 277 #if defined(USE_IEEE)
 278 #define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))
 279 #else
 280 /* Could just use (x*y<0) except for the flatshading requirements.
 281  * Maybe there's a better way?
 282  */
 283 #define DIFFERENT_SIGNS(x,y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)
 284 #endif
 285
 286
 287 /***
 288  *** CEILF: ceiling of float
 289  *** FLOORF: floor of float
 290  *** FABSF: absolute value of float
 291  *** LOGF: the natural logarithm (base e) of the value
 292  *** EXPF: raise e to the value
 293  *** LDEXPF: multiply value by an integral power of two
 294  *** FREXPF: extract mantissa and exponent from value
 295  ***/
 296 #if defined(__gnu_linux__)
 297 /* C99 functions */
 298 #define CEILF(x)   ceilf(x)
 299 #define FLOORF(x)  floorf(x)
 300 #define FABSF(x)   fabsf(x)
 301 #define LOGF(x)    logf(x)
 302 #define EXPF(x)    expf(x)
 303 #define LDEXPF(x,y)  ldexpf(x,y)
 304 #define FREXPF(x,y)  frexpf(x,y)
 305 #else
 306 #define CEILF(x)   ((GLfloat) ceil(x))
 307 #define FLOORF(x)  ((GLfloat) floor(x))
 308 #define FABSF(x)   ((GLfloat) fabs(x))
 309 #define LOGF(x)    ((GLfloat) log(x))
 310 #define EXPF(x)    ((GLfloat) exp(x))
 311 #define LDEXPF(x,y)  ((GLfloat) ldexp(x,y))
 312 #define FREXPF(x,y)  ((GLfloat) frexp(x,y))
 313 #endif
 314
 315
 316 /***
 317  *** IROUND: return (as an integer) float rounded to nearest integer
 318  ***/
 319 #if defined(USE_SPARC_ASM) && defined(__GNUC__) && defined(__sparc__)
 320 static INLINE int iround(float f)
 321 {
 322    int r;
 323    __asm__ ("fstoi %1, %0" : "=f" (r) : "f" (f));
 324    return r;
 325 }
 326 #define IROUND(x)  iround(x)
 327 #elif defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__) && \
 328                         (!defined(__BEOS__) || (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)))
 329 static INLINE int iround(float f)
 330 {
 331    int r;
 332    __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");
 333    return r;
 334 }
 335 #define IROUND(x)  iround(x)
 336 #elif defined(USE_X86_ASM) && defined(_MSC_VER)
 337 static INLINE int iround(float f)
 338 {
 339    int r;
 340    _asm {
 341          fld f
 342          fistp r
 343         }
 344    return r;
 345 }
 346 #define IROUND(x)  iround(x)
 347 #elif defined(__WATCOMC__) && defined(__386__)
 348 long iround(float f);
 349 #pragma aux iround =                    \
 350         "push   eax"                        \
 351         "fistp  dword ptr [esp]"            \
 352         "pop    eax"                        \
 353         parm [8087]                         \
 354         value [eax]                         \
 355         modify exact [eax];
 356 #define IROUND(x)  iround(x)
 357 #else
 358 #define IROUND(f)  ((int) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))
 359 #endif
 360
 361
 362 /***
 363  *** IROUND_POS: return (as an integer) positive float rounded to nearest int
 364  ***/
 365 #ifdef DEBUG
 366 #define IROUND_POS(f) (assert((f) >= 0.0F), IROUND(f))
 367 #else
 368 #define IROUND_POS(f) (IROUND(f))
 369 #endif
 370
 371
 372 /***
 373  *** IFLOOR: return (as an integer) floor of float
 374  ***/
 375 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 376 /*
 377  * IEEE floor for computers that round to nearest or even.
 378  * 'f' must be between -4194304 and 4194303.
 379  * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
 380  * but uses some IEEE specific tricks for better speed.
 381  * Contributed by Josh Vanderhoof
 382  */
 383 static INLINE int ifloor(float f)
 384 {
 385    int ai, bi;
 386    double af, bf;
 387    af = (3 << 22) + 0.5 + (double)f;
 388    bf = (3 << 22) + 0.5 - (double)f;
 389    /* GCC generates an extra fstp/fld without this. */
 390    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 391    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 392    return (ai - bi) >> 1;
 393 }
 394 #define IFLOOR(x)  ifloor(x)
 395 #elif defined(USE_IEEE)
 396 static INLINE int ifloor(float f)
 397 {
 398    int ai, bi;
 399    double af, bf;
 400    fi_type u;
 401
 402    af = (3 << 22) + 0.5 + (double)f;
 403    bf = (3 << 22) + 0.5 - (double)f;
 404    u.f = (float) af;  ai = u.i;
 405    u.f = (float) bf;  bi = u.i;
 406    return (ai - bi) >> 1;
 407 }
 408 #define IFLOOR(x)  ifloor(x)
 409 #else
 410 static INLINE int ifloor(float f)
 411 {
 412    int i = IROUND(f);
 413    return (i > f) ? i - 1 : i;
 414 }
 415 #define IFLOOR(x)  ifloor(x)
 416 #endif
 417
 418
 419 /***
 420  *** ICEIL: return (as an integer) ceiling of float
 421  ***/
 422 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 423 /*
 424  * IEEE ceil for computers that round to nearest or even.
 425  * 'f' must be between -4194304 and 4194303.
 426  * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",
 427  * but uses some IEEE specific tricks for better speed.
 428  * Contributed by Josh Vanderhoof
 429  */
 430 static INLINE int iceil(float f)
 431 {
 432    int ai, bi;
 433    double af, bf;
 434    af = (3 << 22) + 0.5 + (double)f;
 435    bf = (3 << 22) + 0.5 - (double)f;
 436    /* GCC generates an extra fstp/fld without this. */
 437    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 438    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 439    return (ai - bi + 1) >> 1;
 440 }
 441 #define ICEIL(x)  iceil(x)
 442 #elif defined(USE_IEEE)
 443 static INLINE int iceil(float f)
 444 {
 445    int ai, bi;
 446    double af, bf;
 447    fi_type u;
 448    af = (3 << 22) + 0.5 + (double)f;
 449    bf = (3 << 22) + 0.5 - (double)f;
 450    u.f = (float) af; ai = u.i;
 451    u.f = (float) bf; bi = u.i;
 452    return (ai - bi + 1) >> 1;
 453 }
 454 #define ICEIL(x)  iceil(x)
 455 #else
 456 static INLINE int iceil(float f)
 457 {
 458    int i = IROUND(f);
 459    return (i < f) ? i + 1 : i;
 460 }
 461 #define ICEIL(x)  iceil(x)
 462 #endif
 463
 464
 465 /**
 466  * Is x a power of two?
 467  */
 468 static INLINE int
 469 _mesa_is_pow_two(int x)
 470 {
 471    return !(x & (x - 1));
 472 }
 473
 474
 475 /***
 476  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
 477  *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
 478  ***/
 479 #if defined(USE_IEEE) && !defined(DEBUG)
 480 #define IEEE_0996 0x3f7f0000    /* 0.996 or so */
 481 /* This function/macro is sensitive to precision.  Test very carefully
 482  * if you change it!
 483  */
 484 #define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)                                 \
 485         do {                                                            \
 486            fi_type __tmp;                                               \
 487            __tmp.f = (F);                                               \
 488            if (__tmp.i < 0)                                             \
 489               UB = (GLubyte) 0;                                         \
 490            else if (__tmp.i >= IEEE_0996)                               \
 491               UB = (GLubyte) 255;                                       \
 492            else {                                                       \
 493               __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F;           \
 494               UB = (GLubyte) __tmp.i;                                   \
 495            }                                                            \
 496         } while (0)
 497 #define CLAMPED_FLOAT_TO_UBYTE(UB, F)                                   \
 498         do {                                                            \
 499            fi_type __tmp;                                               \
 500            __tmp.f = (F) * (255.0F/256.0F) + 32768.0F;                  \
 501            UB = (GLubyte) __tmp.i;                                      \
 502         } while (0)
 503 #else
 504 #define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \
 505         ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F))
 506 #define CLAMPED_FLOAT_TO_UBYTE(ub, f) \
 507         ub = ((GLubyte) IROUND((f) * 255.0F))
 508 #endif
 509
 510
 511 /***
 512  *** START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
 513  ***                  original mode to a temporary).
 514  *** END_FAST_MATH: Restore x86 FPU to original mode.
 515  ***/
 516 #if defined(__GNUC__) && defined(__i386__)
 517 /*
 518  * Set the x86 FPU control word to guarentee only 32 bits of precision
 519  * are stored in registers.  Allowing the FPU to store more introduces
 520  * differences between situations where numbers are pulled out of memory
 521  * vs. situations where the compiler is able to optimize register usage.
 522  *
 523  * In the worst case, we force the compiler to use a memory access to
 524  * truncate the float, by specifying the 'volatile' keyword.
 525  */
 526 /* Hardware default: All exceptions masked, extended double precision,
 527  * round to nearest (IEEE compliant):
 528  */
 529 #define DEFAULT_X86_FPU         0x037f
 530 /* All exceptions masked, single precision, round to nearest:
 531  */
 532 #define FAST_X86_FPU            0x003f
 533 /* The fldcw instruction will cause any pending FP exceptions to be
 534  * raised prior to entering the block, and we clear any pending
 535  * exceptions before exiting the block.  Hence, asm code has free
 536  * reign over the FPU while in the fast math block.
 537  */
 538 #if defined(NO_FAST_MATH)
 539 #define START_FAST_MATH(x)                                              \
 540 do {                                                                    \
 541    static GLuint mask = DEFAULT_X86_FPU;                                \
 542    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 543    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 544 } while (0)
 545 #else
 546 #define START_FAST_MATH(x)                                              \
 547 do {                                                                    \
 548    static GLuint mask = FAST_X86_FPU;                                   \
 549    __asm__ ( "fnstcw %0" : "=m" (*&(x)) );                              \
 550    __asm__ ( "fldcw %0" : : "m" (mask) );                               \
 551 } while (0)
 552 #endif
 553 /* Restore original FPU mode, and clear any exceptions that may have
 554  * occurred in the FAST_MATH block.
 555  */
 556 #define END_FAST_MATH(x)                                                \
 557 do {                                                                    \
 558    __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) );                     \
 559 } while (0)
 560
 561 #elif defined(__WATCOMC__) && defined(__386__)
 562 #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
 563 #define FAST_X86_FPU            0x003f /* See GCC comments above */
 564 void _watcom_start_fast_math(unsigned short *x,unsigned short *mask);
 565 #pragma aux _watcom_start_fast_math =                                   \
 566    "fnstcw  word ptr [eax]"                                             \
 567    "fldcw   word ptr [ecx]"                                             \
 568    parm [eax] [ecx]                                                     \
 569    modify exact [];
 570 void _watcom_end_fast_math(unsigned short *x);
 571 #pragma aux _watcom_end_fast_math =                                     \
 572    "fnclex"                                                             \
 573    "fldcw   word ptr [eax]"                                             \
 574    parm [eax]                                                           \
 575    modify exact [];
 576 #if defined(NO_FAST_MATH)
 577 #define START_FAST_MATH(x)                                              \
 578 do {                                                                    \
 579    static GLushort mask = DEFAULT_X86_FPU;                                  \
 580    _watcom_start_fast_math(&x,&mask);                                   \
 581 } while (0)
 582 #else
 583 #define START_FAST_MATH(x)                                              \
 584 do {                                                                    \
 585    static GLushort mask = FAST_X86_FPU;                                 \
 586    _watcom_start_fast_math(&x,&mask);                                   \
 587 } while (0)
 588 #endif
 589 #define END_FAST_MATH(x)  _watcom_end_fast_math(&x)
 590
 591 #elif defined(_MSC_VER) && defined(_M_IX86)
 592 #define DEFAULT_X86_FPU         0x037f /* See GCC comments above */
 593 #define FAST_X86_FPU            0x003f /* See GCC comments above */
 594 #if defined(NO_FAST_MATH)
 595 #define START_FAST_MATH(x) do {\
 596         static GLuint mask = DEFAULT_X86_FPU;\
 597         __asm fnstcw word ptr [x]\
 598         __asm fldcw word ptr [mask]\
 599 } while(0)
 600 #else
 601 #define START_FAST_MATH(x) do {\
 602         static GLuint mask = FAST_X86_FPU;\
 603         __asm fnstcw word ptr [x]\
 604         __asm fldcw word ptr [mask]\
 605 } while(0)
 606 #endif
 607 #define END_FAST_MATH(x) do {\
 608         __asm fnclex\
 609         __asm fldcw word ptr [x]\
 610 } while(0)
 611
 612 #else
 613 #define START_FAST_MATH(x)  x = 0
 614 #define END_FAST_MATH(x)  (void)(x)
 615 #endif
 616
 617
 618 /**
 619  * Return 1 if this is a little endian machine, 0 if big endian.
 620  */
 621 static INLINE GLboolean
 622 _mesa_little_endian(void)
 623 {
 624    const GLuint ui = 1; /* intentionally not static */
 625    return *((const GLubyte *) &ui);
 626 }
 627
 628
 629
 630 /**********************************************************************
 631  * Functions
 632  */
 633
 634 extern void *
 635 _mesa_malloc( size_t bytes );
 636
 637 extern void *
 638 _mesa_calloc( size_t bytes );
 639
 640 extern void
 641 _mesa_free( void *ptr );
 642
 643 extern void *
 644 _mesa_align_malloc( size_t bytes, unsigned long alignment );
 645
 646 extern void *
 647 _mesa_align_calloc( size_t bytes, unsigned long alignment );
 648
 649 extern void
 650 _mesa_align_free( void *ptr );
 651
 652 extern void *
 653 _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
 654                     unsigned long alignment);
 655
 656 extern void *
 657 _mesa_exec_malloc( GLuint size );
 658
 659 extern void
 660 _mesa_exec_free( void *addr );
 661
 662 extern void *
 663 _mesa_realloc( void *oldBuffer, size_t oldSize, size_t newSize );
 664
 665 extern void *
 666 _mesa_memcpy( void *dest, const void *src, size_t n );
 667
 668 extern void
 669 _mesa_memset( void *dst, int val, size_t n );
 670
 671 extern void
 672 _mesa_memset16( unsigned short *dst, unsigned short val, size_t n );
 673
 674 extern void
 675 _mesa_bzero( void *dst, size_t n );
 676
 677 extern int
 678 _mesa_memcmp( const void *s1, const void *s2, size_t n );
 679
 680 extern double
 681 _mesa_sin(double a);
 682
 683 extern float
 684 _mesa_sinf(float a);
 685
 686 extern double
 687 _mesa_cos(double a);
 688
 689 extern float
 690 _mesa_asinf(float x);
 691
 692 extern float
 693 _mesa_atanf(float x);
 694
 695 extern double
 696 _mesa_sqrtd(double x);
 697
 698 extern float
 699 _mesa_sqrtf(float x);
 700
 701 extern float
 702 _mesa_inv_sqrtf(float x);
 703
 704 extern void
 705 _mesa_init_sqrt_table(void);
 706
 707 extern double
 708 _mesa_pow(double x, double y);
 709
 710 extern int
 711 _mesa_ffs(int32_t i);
 712
 713 extern int
 714 _mesa_ffsll(int64_t i);
 715
 716 extern unsigned int
 717 _mesa_bitcount(unsigned int n);
 718
 719 extern GLhalfARB
 720 _mesa_float_to_half(float f);
 721
 722 extern float
 723 _mesa_half_to_float(GLhalfARB h);
 724
 725
 726 extern void *
 727 _mesa_bsearch( const void *key, const void *base, size_t nmemb, size_t size,
 728                int (*compar)(const void *, const void *) );
 729
 730 extern char *
 731 _mesa_getenv( const char *var );
 732
 733 extern char *
 734 _mesa_strstr( const char *haystack, const char *needle );
 735
 736 extern char *
 737 _mesa_strncat( char *dest, const char *src, size_t n );
 738
 739 extern char *
 740 _mesa_strcpy( char *dest, const char *src );
 741
 742 extern char *
 743 _mesa_strncpy( char *dest, const char *src, size_t n );
 744
 745 extern size_t
 746 _mesa_strlen( const char *s );
 747
 748 extern int
 749 _mesa_strcmp( const char *s1, const char *s2 );
 750
 751 extern int
 752 _mesa_strncmp( const char *s1, const char *s2, size_t n );
 753
 754 extern char *
 755 _mesa_strdup( const char *s );
 756
 757 extern int
 758 _mesa_atoi( const char *s );
 759
 760 extern double
 761 _mesa_strtod( const char *s, char **end );
 762
 763 extern int
 764 _mesa_sprintf( char *str, const char *fmt, ... );
 765
 766 extern void
 767 _mesa_printf( const char *fmtString, ... );
 768
 769 extern int
 770 _mesa_vsprintf( char *str, const char *fmt, va_list args );
 771
 772
 773 extern void
 774 _mesa_warning( __GLcontext *gc, const char *fmtString, ... );
 775
 776 extern void
 777 _mesa_problem( const __GLcontext *ctx, const char *fmtString, ... );
 778
 779 extern void
 780 _mesa_error( __GLcontext *ctx, GLenum error, const char *fmtString, ... );
 781
 782 extern void
 783 _mesa_debug( const __GLcontext *ctx, const char *fmtString, ... );
 784
 785 extern void
 786 _mesa_exit( int status );
 787
 788
 789 #ifdef __cplusplus
 790 }
 791 #endif
 792
 793
 794 #endif /* IMPORTS_H */