src/mesa/main/imports.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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 #include "compiler.h"
  40 #include "glheader.h"
  41 #include "errors.h"
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47
  48 /**********************************************************************/
  49 /** Memory macros */
  50 /*@{*/
  51
  52 /** Allocate a structure of type \p T */
  53 #define MALLOC_STRUCT(T)   (struct T *) malloc(sizeof(struct T))
  54 /** Allocate and zero a structure of type \p T */
  55 #define CALLOC_STRUCT(T)   (struct T *) calloc(1, sizeof(struct T))
  56
  57 /*@}*/
  58
  59
  60 /*
  61  * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
  62  * as offsets into buffer stores.  Since the vertex array pointer and
  63  * buffer store pointer are both pointers and we need to add them, we use
  64  * this macro.
  65  * Both pointers/offsets are expressed in bytes.
  66  */
  67 #define ADD_POINTERS(A, B)  ( (GLubyte *) (A) + (uintptr_t) (B) )
  68
  69
  70 /**
  71  * Sometimes we treat GLfloats as GLints.  On x86 systems, moving a float
  72  * as a int (thereby using integer registers instead of FP registers) is
  73  * a performance win.  Typically, this can be done with ordinary casts.
  74  * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
  75  * these casts generate warnings.
  76  * The following union typedef is used to solve that.
  77  */
  78 typedef union { GLfloat f; GLint i; GLuint u; } fi_type;
  79
  80
  81
  82 /**********************************************************************
  83  * Math macros
  84  */
  85
  86 #define MAX_GLUSHORT    0xffff
  87 #define MAX_GLUINT      0xffffffff
  88
  89 /* Degrees to radians conversion: */
  90 #define DEG2RAD (M_PI/180.0)
  91
  92
  93 /**
  94  * \name Work-arounds for platforms that lack C99 math functions
  95  */
  96 /*@{*/
  97 #if (!defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE < 600)) && !defined(_ISOC99_SOURCE) \
  98    && (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)) \
  99    && (!defined(_MSC_VER) || (_MSC_VER < 1400))
 100 #define acosf(f) ((float) acos(f))
 101 #define asinf(f) ((float) asin(f))
 102 #define atan2f(x,y) ((float) atan2(x,y))
 103 #define atanf(f) ((float) atan(f))
 104 #define ceilf(f) ((float) ceil(f))
 105 #define cosf(f) ((float) cos(f))
 106 #define coshf(f) ((float) cosh(f))
 107 #define expf(f) ((float) exp(f))
 108 #define exp2f(f) ((float) exp2(f))
 109 #define floorf(f) ((float) floor(f))
 110 #define logf(f) ((float) log(f))
 111
 112 #ifdef ANDROID
 113 #define log2f(f) (logf(f) * (float) (1.0 / M_LN2))
 114 #else
 115 #define log2f(f) ((float) log2(f))
 116 #endif
 117
 118 #define powf(x,y) ((float) pow(x,y))
 119 #define sinf(f) ((float) sin(f))
 120 #define sinhf(f) ((float) sinh(f))
 121 #define sqrtf(f) ((float) sqrt(f))
 122 #define tanf(f) ((float) tan(f))
 123 #define tanhf(f) ((float) tanh(f))
 124 #define acoshf(f) ((float) acosh(f))
 125 #define asinhf(f) ((float) asinh(f))
 126 #define atanhf(f) ((float) atanh(f))
 127 #endif
 128
 129 #if defined(_MSC_VER)
 130 #if _MSC_VER < 1800  /* Not req'd on VS2013 and above */
 131 static inline float truncf(float x) { return x < 0.0f ? ceilf(x) : floorf(x); }
 132 static inline float exp2f(float x) { return powf(2.0f, x); }
 133 static inline float log2f(float x) { return logf(x) * 1.442695041f; }
 134 static inline float asinhf(float x) { return logf(x + sqrtf(x * x + 1.0f)); }
 135 static inline float acoshf(float x) { return logf(x + sqrtf(x * x - 1.0f)); }
 136 static inline float atanhf(float x) { return (logf(1.0f + x) - logf(1.0f - x)) / 2.0f; }
 137 static inline int isblank(int ch) { return ch == ' ' || ch == '\t'; }
 138 #define strtoll(p, e, b) _strtoi64(p, e, b)
 139 #endif /* _MSC_VER < 1800 */
 140 #define strcasecmp(s1, s2) _stricmp(s1, s2)
 141 #endif
 142 /*@}*/
 143
 144
 145 /*
 146  * signbit() is a macro on Linux.  Not available on Windows.
 147  */
 148 #ifndef signbit
 149 #define signbit(x) ((x) < 0.0f)
 150 #endif
 151
 152
 153 /** single-precision inverse square root */
 154 static inline float
 155 INV_SQRTF(float x)
 156 {
 157    /* XXX we could try Quake's fast inverse square root function here */
 158    return 1.0F / sqrtf(x);
 159 }
 160
 161
 162 /***
 163  *** LOG2: Log base 2 of float
 164  ***/
 165 static inline GLfloat LOG2(GLfloat x)
 166 {
 167 #if 0
 168    /* This is pretty fast, but not accurate enough (only 2 fractional bits).
 169     * Based on code from http://www.stereopsis.com/log2.html
 170     */
 171    const GLfloat y = x * x * x * x;
 172    const GLuint ix = *((GLuint *) &y);
 173    const GLuint exp = (ix >> 23) & 0xFF;
 174    const GLint log2 = ((GLint) exp) - 127;
 175    return (GLfloat) log2 * (1.0 / 4.0);  /* 4, because of x^4 above */
 176 #endif
 177    /* Pretty fast, and accurate.
 178     * Based on code from http://www.flipcode.com/totd/
 179     */
 180    fi_type num;
 181    GLint log_2;
 182    num.f = x;
 183    log_2 = ((num.i >> 23) & 255) - 128;
 184    num.i &= ~(255 << 23);
 185    num.i += 127 << 23;
 186    num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
 187    return num.f + log_2;
 188 }
 189
 190
 191
 192 /***
 193  *** IS_INF_OR_NAN: test if float is infinite or NaN
 194  ***/
 195 #if defined(isfinite)
 196 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 197 #elif defined(finite)
 198 #define IS_INF_OR_NAN(x)        (!finite(x))
 199 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 200 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 201 #else
 202 #define IS_INF_OR_NAN(x)        (!finite(x))
 203 #endif
 204
 205
 206 /**
 207  * Convert float to int by rounding to nearest integer, away from zero.
 208  */
 209 static inline int IROUND(float f)
 210 {
 211    return (int) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
 212 }
 213
 214
 215 /**
 216  * Convert float to int64 by rounding to nearest integer.
 217  */
 218 static inline GLint64 IROUND64(float f)
 219 {
 220    return (GLint64) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
 221 }
 222
 223
 224 /**
 225  * Convert positive float to int by rounding to nearest integer.
 226  */
 227 static inline int IROUND_POS(float f)
 228 {
 229    assert(f >= 0.0F);
 230    return (int) (f + 0.5F);
 231 }
 232
 233 #ifdef __x86_64__
 234 #  include <xmmintrin.h>
 235 #endif
 236
 237 /**
 238  * Convert float to int using a fast method.  The rounding mode may vary.
 239  */
 240 static inline int F_TO_I(float f)
 241 {
 242 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 243    int r;
 244    __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");
 245    return r;
 246 #elif defined(USE_X86_ASM) && defined(_MSC_VER)
 247    int r;
 248    _asm {
 249          fld f
 250          fistp r
 251         }
 252    return r;
 253 #elif defined(__x86_64__)
 254    return _mm_cvt_ss2si(_mm_load_ss(&f));
 255 #else
 256    return IROUND(f);
 257 #endif
 258 }
 259
 260
 261 /** Return (as an integer) floor of float */
 262 static inline int IFLOOR(float f)
 263 {
 264 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 265    /*
 266     * IEEE floor for computers that round to nearest or even.
 267     * 'f' must be between -4194304 and 4194303.
 268     * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
 269     * but uses some IEEE specific tricks for better speed.
 270     * Contributed by Josh Vanderhoof
 271     */
 272    int ai, bi;
 273    double af, bf;
 274    af = (3 << 22) + 0.5 + (double)f;
 275    bf = (3 << 22) + 0.5 - (double)f;
 276    /* GCC generates an extra fstp/fld without this. */
 277    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 278    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 279    return (ai - bi) >> 1;
 280 #else
 281    int ai, bi;
 282    double af, bf;
 283    fi_type u;
 284    af = (3 << 22) + 0.5 + (double)f;
 285    bf = (3 << 22) + 0.5 - (double)f;
 286    u.f = (float) af;  ai = u.i;
 287    u.f = (float) bf;  bi = u.i;
 288    return (ai - bi) >> 1;
 289 #endif
 290 }
 291
 292
 293 /** Return (as an integer) ceiling of float */
 294 static inline int ICEIL(float f)
 295 {
 296 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 297    /*
 298     * IEEE ceil for computers that round to nearest or even.
 299     * 'f' must be between -4194304 and 4194303.
 300     * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",
 301     * but uses some IEEE specific tricks for better speed.
 302     * Contributed by Josh Vanderhoof
 303     */
 304    int ai, bi;
 305    double af, bf;
 306    af = (3 << 22) + 0.5 + (double)f;
 307    bf = (3 << 22) + 0.5 - (double)f;
 308    /* GCC generates an extra fstp/fld without this. */
 309    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 310    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 311    return (ai - bi + 1) >> 1;
 312 #else
 313    int ai, bi;
 314    double af, bf;
 315    fi_type u;
 316    af = (3 << 22) + 0.5 + (double)f;
 317    bf = (3 << 22) + 0.5 - (double)f;
 318    u.f = (float) af; ai = u.i;
 319    u.f = (float) bf; bi = u.i;
 320    return (ai - bi + 1) >> 1;
 321 #endif
 322 }
 323
 324
 325 /**
 326  * Is x a power of two?
 327  */
 328 static inline int
 329 _mesa_is_pow_two(int x)
 330 {
 331    return !(x & (x - 1));
 332 }
 333
 334 /**
 335  * Round given integer to next higer power of two
 336  * If X is zero result is undefined.
 337  *
 338  * Source for the fallback implementation is
 339  * Sean Eron Anderson's webpage "Bit Twiddling Hacks"
 340  * http://graphics.stanford.edu/~seander/bithacks.html
 341  *
 342  * When using builtin function have to do some work
 343  * for case when passed values 1 to prevent hiting
 344  * undefined result from __builtin_clz. Undefined
 345  * results would be different depending on optimization
 346  * level used for build.
 347  */
 348 static inline int32_t
 349 _mesa_next_pow_two_32(uint32_t x)
 350 {
 351 #ifdef HAVE___BUILTIN_CLZ
 352         uint32_t y = (x != 1);
 353         return (1 + y) << ((__builtin_clz(x - y) ^ 31) );
 354 #else
 355         x--;
 356         x |= x >> 1;
 357         x |= x >> 2;
 358         x |= x >> 4;
 359         x |= x >> 8;
 360         x |= x >> 16;
 361         x++;
 362         return x;
 363 #endif
 364 }
 365
 366 static inline int64_t
 367 _mesa_next_pow_two_64(uint64_t x)
 368 {
 369 #ifdef HAVE___BUILTIN_CLZLL
 370         uint64_t y = (x != 1);
 371         STATIC_ASSERT(sizeof(x) == sizeof(long long));
 372         return (1 + y) << ((__builtin_clzll(x - y) ^ 63));
 373 #else
 374         x--;
 375         x |= x >> 1;
 376         x |= x >> 2;
 377         x |= x >> 4;
 378         x |= x >> 8;
 379         x |= x >> 16;
 380         x |= x >> 32;
 381         x++;
 382         return x;
 383 #endif
 384 }
 385
 386
 387 /*
 388  * Returns the floor form of binary logarithm for a 32-bit integer.
 389  */
 390 static inline GLuint
 391 _mesa_logbase2(GLuint n)
 392 {
 393 #ifdef HAVE___BUILTIN_CLZ
 394    return (31 - __builtin_clz(n | 1));
 395 #else
 396    GLuint pos = 0;
 397    if (n >= 1<<16) { n >>= 16; pos += 16; }
 398    if (n >= 1<< 8) { n >>=  8; pos +=  8; }
 399    if (n >= 1<< 4) { n >>=  4; pos +=  4; }
 400    if (n >= 1<< 2) { n >>=  2; pos +=  2; }
 401    if (n >= 1<< 1) {           pos +=  1; }
 402    return pos;
 403 #endif
 404 }
 405
 406
 407 /**
 408  * Return 1 if this is a little endian machine, 0 if big endian.
 409  */
 410 static inline GLboolean
 411 _mesa_little_endian(void)
 412 {
 413    const GLuint ui = 1; /* intentionally not static */
 414    return *((const GLubyte *) &ui);
 415 }
 416
 417
 418
 419 /**********************************************************************
 420  * Functions
 421  */
 422
 423 extern void *
 424 _mesa_align_malloc( size_t bytes, unsigned long alignment );
 425
 426 extern void *
 427 _mesa_align_calloc( size_t bytes, unsigned long alignment );
 428
 429 extern void
 430 _mesa_align_free( void *ptr );
 431
 432 extern void *
 433 _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
 434                     unsigned long alignment);
 435
 436 extern void *
 437 _mesa_exec_malloc( GLuint size );
 438
 439 extern void
 440 _mesa_exec_free( void *addr );
 441
 442
 443 #ifndef FFS_DEFINED
 444 #define FFS_DEFINED 1
 445 #ifdef HAVE___BUILTIN_FFS
 446 #define ffs __builtin_ffs
 447 #else
 448 extern int ffs(int i);
 449 #endif
 450
 451 #ifdef HAVE___BUILTIN_FFSLL
 452 #define ffsll __builtin_ffsll
 453 #else
 454 extern int ffsll(long long int i);
 455 #endif
 456 #endif /* FFS_DEFINED */
 457
 458
 459 #ifdef HAVE___BUILTIN_POPCOUNT
 460 #define _mesa_bitcount(i) __builtin_popcount(i)
 461 #else
 462 extern unsigned int
 463 _mesa_bitcount(unsigned int n);
 464 #endif
 465
 466 #ifdef HAVE___BUILTIN_POPCOUNTLL
 467 #define _mesa_bitcount_64(i) __builtin_popcountll(i)
 468 #else
 469 extern unsigned int
 470 _mesa_bitcount_64(uint64_t n);
 471 #endif
 472
 473 /**
 474  * Find the last (most significant) bit set in a word.
 475  *
 476  * Essentially ffs() in the reverse direction.
 477  */
 478 static inline unsigned int
 479 _mesa_fls(unsigned int n)
 480 {
 481 #ifdef HAVE___BUILTIN_CLZ
 482    return n == 0 ? 0 : 32 - __builtin_clz(n);
 483 #else
 484    unsigned int v = 1;
 485
 486    if (n == 0)
 487       return 0;
 488
 489    while (n >>= 1)
 490        v++;
 491
 492    return v;
 493 #endif
 494 }
 495
 496 extern int
 497 _mesa_round_to_even(float val);
 498
 499 extern GLhalfARB
 500 _mesa_float_to_half(float f);
 501
 502 extern float
 503 _mesa_half_to_float(GLhalfARB h);
 504
 505 static inline bool
 506 _mesa_half_is_negative(GLhalfARB h)
 507 {
 508    return h & 0x8000;
 509 }
 510
 511 extern char *
 512 _mesa_strdup( const char *s );
 513
 514 extern unsigned int
 515 _mesa_str_checksum(const char *str);
 516
 517 extern int
 518 _mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);
 519
 520 extern int
 521 _mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list arg);
 522
 523
 524 #if defined(_MSC_VER) && !defined(snprintf)
 525 #define snprintf _snprintf
 526 #endif
 527
 528
 529 #ifdef __cplusplus
 530 }
 531 #endif
 532
 533
 534 #endif /* IMPORTS_H */