src/mesa/main/imports.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.5
   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 #include "compiler.h"
  40 #include "glheader.h"
  41
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47
  48 /**********************************************************************/
  49 /** Memory macros */
  50 /*@{*/
  51
  52 /** Allocate \p BYTES bytes */
  53 #define MALLOC(BYTES)      malloc(BYTES)
  54 /** Allocate and zero \p BYTES bytes */
  55 #define CALLOC(BYTES)      calloc(1, BYTES)
  56 /** Allocate a structure of type \p T */
  57 #define MALLOC_STRUCT(T)   (struct T *) malloc(sizeof(struct T))
  58 /** Allocate and zero a structure of type \p T */
  59 #define CALLOC_STRUCT(T)   (struct T *) calloc(1, sizeof(struct T))
  60 /** Free memory */
  61 #define FREE(PTR)          free(PTR)
  62
  63 /*@}*/
  64
  65
  66 /*
  67  * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
  68  * as offsets into buffer stores.  Since the vertex array pointer and
  69  * buffer store pointer are both pointers and we need to add them, we use
  70  * this macro.
  71  * Both pointers/offsets are expressed in bytes.
  72  */
  73 #define ADD_POINTERS(A, B)  ( (GLubyte *) (A) + (uintptr_t) (B) )
  74
  75
  76 /**
  77  * Sometimes we treat GLfloats as GLints.  On x86 systems, moving a float
  78  * as a int (thereby using integer registers instead of FP registers) is
  79  * a performance win.  Typically, this can be done with ordinary casts.
  80  * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
  81  * these casts generate warnings.
  82  * The following union typedef is used to solve that.
  83  */
  84 typedef union { GLfloat f; GLint i; } fi_type;
  85
  86
  87
  88 /**********************************************************************
  89  * Math macros
  90  */
  91
  92 #define MAX_GLUSHORT    0xffff
  93 #define MAX_GLUINT      0xffffffff
  94
  95 /* Degrees to radians conversion: */
  96 #define DEG2RAD (M_PI/180.0)
  97
  98
  99 /***
 100  *** SQRTF: single-precision square root
 101  ***/
 102 #if 0 /* _mesa_sqrtf() not accurate enough - temporarily disabled */
 103 #  define SQRTF(X)  _mesa_sqrtf(X)
 104 #else
 105 #  define SQRTF(X)  (float) sqrt((float) (X))
 106 #endif
 107
 108
 109 /***
 110  *** INV_SQRTF: single-precision inverse square root
 111  ***/
 112 #if 0
 113 #define INV_SQRTF(X) _mesa_inv_sqrt(X)
 114 #else
 115 #define INV_SQRTF(X) (1.0F / SQRTF(X))  /* this is faster on a P4 */
 116 #endif
 117
 118
 119 /***
 120  *** LOG2: Log base 2 of float
 121  ***/
 122 #ifdef USE_IEEE
 123 #if 0
 124 /* This is pretty fast, but not accurate enough (only 2 fractional bits).
 125  * Based on code from http://www.stereopsis.com/log2.html
 126  */
 127 static INLINE GLfloat LOG2(GLfloat x)
 128 {
 129    const GLfloat y = x * x * x * x;
 130    const GLuint ix = *((GLuint *) &y);
 131    const GLuint exp = (ix >> 23) & 0xFF;
 132    const GLint log2 = ((GLint) exp) - 127;
 133    return (GLfloat) log2 * (1.0 / 4.0);  /* 4, because of x^4 above */
 134 }
 135 #endif
 136 /* Pretty fast, and accurate.
 137  * Based on code from http://www.flipcode.com/totd/
 138  */
 139 static INLINE GLfloat LOG2(GLfloat val)
 140 {
 141    fi_type num;
 142    GLint log_2;
 143    num.f = val;
 144    log_2 = ((num.i >> 23) & 255) - 128;
 145    num.i &= ~(255 << 23);
 146    num.i += 127 << 23;
 147    num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
 148    return num.f + log_2;
 149 }
 150 #else
 151 /*
 152  * NOTE: log_base_2(x) = log(x) / log(2)
 153  * NOTE: 1.442695 = 1/log(2).
 154  */
 155 #define LOG2(x)  ((GLfloat) (log(x) * 1.442695F))
 156 #endif
 157
 158
 159 /***
 160  *** IS_INF_OR_NAN: test if float is infinite or NaN
 161  ***/
 162 #ifdef USE_IEEE
 163 static INLINE int IS_INF_OR_NAN( float x )
 164 {
 165    fi_type tmp;
 166    tmp.f = x;
 167    return !(int)((unsigned int)((tmp.i & 0x7fffffff)-0x7f800000) >> 31);
 168 }
 169 #elif defined(isfinite)
 170 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 171 #elif defined(finite)
 172 #define IS_INF_OR_NAN(x)        (!finite(x))
 173 #elif defined(__VMS)
 174 #define IS_INF_OR_NAN(x)        (!finite(x))
 175 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 176 #define IS_INF_OR_NAN(x)        (!isfinite(x))
 177 #else
 178 #define IS_INF_OR_NAN(x)        (!finite(x))
 179 #endif
 180
 181
 182 /***
 183  *** IS_NEGATIVE: test if float is negative
 184  ***/
 185 #if defined(USE_IEEE)
 186 static INLINE int GET_FLOAT_BITS( float x )
 187 {
 188    fi_type fi;
 189    fi.f = x;
 190    return fi.i;
 191 }
 192 #define IS_NEGATIVE(x) (GET_FLOAT_BITS(x) < 0)
 193 #else
 194 #define IS_NEGATIVE(x) (x < 0.0F)
 195 #endif
 196
 197
 198 /***
 199  *** DIFFERENT_SIGNS: test if two floats have opposite signs
 200  ***/
 201 #if defined(USE_IEEE)
 202 #define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))
 203 #else
 204 /* Could just use (x*y<0) except for the flatshading requirements.
 205  * Maybe there's a better way?
 206  */
 207 #define DIFFERENT_SIGNS(x,y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)
 208 #endif
 209
 210
 211 /***
 212  *** CEILF: ceiling of float
 213  *** FLOORF: floor of float
 214  *** FABSF: absolute value of float
 215  *** LOGF: the natural logarithm (base e) of the value
 216  *** EXPF: raise e to the value
 217  *** LDEXPF: multiply value by an integral power of two
 218  *** FREXPF: extract mantissa and exponent from value
 219  ***/
 220 #if defined(__gnu_linux__)
 221 /* C99 functions */
 222 #define CEILF(x)   ceilf(x)
 223 #define FLOORF(x)  floorf(x)
 224 #define FABSF(x)   fabsf(x)
 225 #define LOGF(x)    logf(x)
 226 #define EXPF(x)    expf(x)
 227 #define LDEXPF(x,y)  ldexpf(x,y)
 228 #define FREXPF(x,y)  frexpf(x,y)
 229 #else
 230 #define CEILF(x)   ((GLfloat) ceil(x))
 231 #define FLOORF(x)  ((GLfloat) floor(x))
 232 #define FABSF(x)   ((GLfloat) fabs(x))
 233 #define LOGF(x)    ((GLfloat) log(x))
 234 #define EXPF(x)    ((GLfloat) exp(x))
 235 #define LDEXPF(x,y)  ((GLfloat) ldexp(x,y))
 236 #define FREXPF(x,y)  ((GLfloat) frexp(x,y))
 237 #endif
 238
 239
 240 /***
 241  *** IROUND: return (as an integer) float rounded to nearest integer
 242  ***/
 243 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 244 static INLINE int iround(float f)
 245 {
 246    int r;
 247    __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");
 248    return r;
 249 }
 250 #define IROUND(x)  iround(x)
 251 #elif defined(USE_X86_ASM) && defined(_MSC_VER)
 252 static INLINE int iround(float f)
 253 {
 254    int r;
 255    _asm {
 256          fld f
 257          fistp r
 258         }
 259    return r;
 260 }
 261 #define IROUND(x)  iround(x)
 262 #elif defined(__WATCOMC__) && defined(__386__)
 263 long iround(float f);
 264 #pragma aux iround =                    \
 265         "push   eax"                        \
 266         "fistp  dword ptr [esp]"            \
 267         "pop    eax"                        \
 268         parm [8087]                         \
 269         value [eax]                         \
 270         modify exact [eax];
 271 #define IROUND(x)  iround(x)
 272 #else
 273 #define IROUND(f)  ((int) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))
 274 #endif
 275
 276 #define IROUND64(f)  ((GLint64) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))
 277
 278 /***
 279  *** IROUND_POS: return (as an integer) positive float rounded to nearest int
 280  ***/
 281 #ifdef DEBUG
 282 #define IROUND_POS(f) (assert((f) >= 0.0F), IROUND(f))
 283 #else
 284 #define IROUND_POS(f) (IROUND(f))
 285 #endif
 286
 287
 288 /***
 289  *** IFLOOR: return (as an integer) floor of float
 290  ***/
 291 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 292 /*
 293  * IEEE floor for computers that round to nearest or even.
 294  * 'f' must be between -4194304 and 4194303.
 295  * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
 296  * but uses some IEEE specific tricks for better speed.
 297  * Contributed by Josh Vanderhoof
 298  */
 299 static INLINE int ifloor(float f)
 300 {
 301    int ai, bi;
 302    double af, bf;
 303    af = (3 << 22) + 0.5 + (double)f;
 304    bf = (3 << 22) + 0.5 - (double)f;
 305    /* GCC generates an extra fstp/fld without this. */
 306    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 307    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 308    return (ai - bi) >> 1;
 309 }
 310 #define IFLOOR(x)  ifloor(x)
 311 #elif defined(USE_IEEE)
 312 static INLINE int ifloor(float f)
 313 {
 314    int ai, bi;
 315    double af, bf;
 316    fi_type u;
 317
 318    af = (3 << 22) + 0.5 + (double)f;
 319    bf = (3 << 22) + 0.5 - (double)f;
 320    u.f = (float) af;  ai = u.i;
 321    u.f = (float) bf;  bi = u.i;
 322    return (ai - bi) >> 1;
 323 }
 324 #define IFLOOR(x)  ifloor(x)
 325 #else
 326 static INLINE int ifloor(float f)
 327 {
 328    int i = IROUND(f);
 329    return (i > f) ? i - 1 : i;
 330 }
 331 #define IFLOOR(x)  ifloor(x)
 332 #endif
 333
 334
 335 /***
 336  *** ICEIL: return (as an integer) ceiling of float
 337  ***/
 338 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
 339 /*
 340  * IEEE ceil for computers that round to nearest or even.
 341  * 'f' must be between -4194304 and 4194303.
 342  * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",
 343  * but uses some IEEE specific tricks for better speed.
 344  * Contributed by Josh Vanderhoof
 345  */
 346 static INLINE int iceil(float f)
 347 {
 348    int ai, bi;
 349    double af, bf;
 350    af = (3 << 22) + 0.5 + (double)f;
 351    bf = (3 << 22) + 0.5 - (double)f;
 352    /* GCC generates an extra fstp/fld without this. */
 353    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
 354    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
 355    return (ai - bi + 1) >> 1;
 356 }
 357 #define ICEIL(x)  iceil(x)
 358 #elif defined(USE_IEEE)
 359 static INLINE int iceil(float f)
 360 {
 361    int ai, bi;
 362    double af, bf;
 363    fi_type u;
 364    af = (3 << 22) + 0.5 + (double)f;
 365    bf = (3 << 22) + 0.5 - (double)f;
 366    u.f = (float) af; ai = u.i;
 367    u.f = (float) bf; bi = u.i;
 368    return (ai - bi + 1) >> 1;
 369 }
 370 #define ICEIL(x)  iceil(x)
 371 #else
 372 static INLINE int iceil(float f)
 373 {
 374    int i = IROUND(f);
 375    return (i < f) ? i + 1 : i;
 376 }
 377 #define ICEIL(x)  iceil(x)
 378 #endif
 379
 380
 381 /**
 382  * Is x a power of two?
 383  */
 384 static INLINE int
 385 _mesa_is_pow_two(int x)
 386 {
 387    return !(x & (x - 1));
 388 }
 389
 390 /**
 391  * Round given integer to next higer power of two
 392  * If X is zero result is undefined.
 393  *
 394  * Source for the fallback implementation is
 395  * Sean Eron Anderson's webpage "Bit Twiddling Hacks"
 396  * http://graphics.stanford.edu/~seander/bithacks.html
 397  *
 398  * When using builtin function have to do some work
 399  * for case when passed values 1 to prevent hiting
 400  * undefined result from __builtin_clz. Undefined
 401  * results would be different depending on optimization
 402  * level used for build.
 403  */
 404 static INLINE int32_t
 405 _mesa_next_pow_two_32(uint32_t x)
 406 {
 407 #if defined(__GNUC__) && \
 408         ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
 409         uint32_t y = (x != 1);
 410         return (1 + y) << ((__builtin_clz(x - y) ^ 31) );
 411 #else
 412         x--;
 413         x |= x >> 1;
 414         x |= x >> 2;
 415         x |= x >> 4;
 416         x |= x >> 8;
 417         x |= x >> 16;
 418         x++;
 419         return x;
 420 #endif
 421 }
 422
 423 static INLINE int64_t
 424 _mesa_next_pow_two_64(uint64_t x)
 425 {
 426 #if defined(__GNUC__) && \
 427         ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
 428         uint64_t y = (x != 1);
 429         if (sizeof(x) == sizeof(long))
 430                 return (1 + y) << ((__builtin_clzl(x - y) ^ 63));
 431         else
 432                 return (1 + y) << ((__builtin_clzll(x - y) ^ 63));
 433 #else
 434         x--;
 435         x |= x >> 1;
 436         x |= x >> 2;
 437         x |= x >> 4;
 438         x |= x >> 8;
 439         x |= x >> 16;
 440         x |= x >> 32;
 441         x++;
 442         return x;
 443 #endif
 444 }
 445
 446
 447 /***
 448  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
 449  *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
 450  ***/
 451 #if defined(USE_IEEE) && !defined(DEBUG)
 452 #define IEEE_0996 0x3f7f0000    /* 0.996 or so */
 453 /* This function/macro is sensitive to precision.  Test very carefully
 454  * if you change it!
 455  */
 456 #define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)                                 \
 457         do {                                                            \
 458            fi_type __tmp;                                               \
 459            __tmp.f = (F);                                               \
 460            if (__tmp.i < 0)                                             \
 461               UB = (GLubyte) 0;                                         \
 462            else if (__tmp.i >= IEEE_0996)                               \
 463               UB = (GLubyte) 255;                                       \
 464            else {                                                       \
 465               __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F;           \
 466               UB = (GLubyte) __tmp.i;                                   \
 467            }                                                            \
 468         } while (0)
 469 #define CLAMPED_FLOAT_TO_UBYTE(UB, F)                                   \
 470         do {                                                            \
 471            fi_type __tmp;                                               \
 472            __tmp.f = (F) * (255.0F/256.0F) + 32768.0F;                  \
 473            UB = (GLubyte) __tmp.i;                                      \
 474         } while (0)
 475 #else
 476 #define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \
 477         ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F))
 478 #define CLAMPED_FLOAT_TO_UBYTE(ub, f) \
 479         ub = ((GLubyte) IROUND((f) * 255.0F))
 480 #endif
 481
 482
 483 /**
 484  * Return 1 if this is a little endian machine, 0 if big endian.
 485  */
 486 static INLINE GLboolean
 487 _mesa_little_endian(void)
 488 {
 489    const GLuint ui = 1; /* intentionally not static */
 490    return *((const GLubyte *) &ui);
 491 }
 492
 493
 494
 495 /**********************************************************************
 496  * Functions
 497  */
 498
 499 extern void *
 500 _mesa_align_malloc( size_t bytes, unsigned long alignment );
 501
 502 extern void *
 503 _mesa_align_calloc( size_t bytes, unsigned long alignment );
 504
 505 extern void
 506 _mesa_align_free( void *ptr );
 507
 508 extern void *
 509 _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
 510                     unsigned long alignment);
 511
 512 extern void *
 513 _mesa_exec_malloc( GLuint size );
 514
 515 extern void
 516 _mesa_exec_free( void *addr );
 517
 518 extern void *
 519 _mesa_realloc( void *oldBuffer, size_t oldSize, size_t newSize );
 520
 521 extern void
 522 _mesa_memset16( unsigned short *dst, unsigned short val, size_t n );
 523
 524 extern double
 525 _mesa_sin(double a);
 526
 527 extern float
 528 _mesa_sinf(float a);
 529
 530 extern double
 531 _mesa_cos(double a);
 532
 533 extern float
 534 _mesa_asinf(float x);
 535
 536 extern float
 537 _mesa_atanf(float x);
 538
 539 extern double
 540 _mesa_sqrtd(double x);
 541
 542 extern float
 543 _mesa_sqrtf(float x);
 544
 545 extern float
 546 _mesa_inv_sqrtf(float x);
 547
 548 extern void
 549 _mesa_init_sqrt_table(void);
 550
 551 extern double
 552 _mesa_pow(double x, double y);
 553
 554 extern int
 555 _mesa_ffs(int32_t i);
 556
 557 extern int
 558 _mesa_ffsll(int64_t i);
 559
 560 extern unsigned int
 561 _mesa_bitcount(unsigned int n);
 562
 563 extern GLhalfARB
 564 _mesa_float_to_half(float f);
 565
 566 extern float
 567 _mesa_half_to_float(GLhalfARB h);
 568
 569
 570 extern void *
 571 _mesa_bsearch( const void *key, const void *base, size_t nmemb, size_t size,
 572                int (*compar)(const void *, const void *) );
 573
 574 extern char *
 575 _mesa_getenv( const char *var );
 576
 577 extern char *
 578 _mesa_strdup( const char *s );
 579
 580 extern float
 581 _mesa_strtof( const char *s, char **end );
 582
 583 extern unsigned int
 584 _mesa_str_checksum(const char *str);
 585
 586 extern int
 587 _mesa_snprintf( char *str, size_t size, const char *fmt, ... );
 588
 589 extern void
 590 _mesa_warning( __GLcontext *gc, const char *fmtString, ... );
 591
 592 extern void
 593 _mesa_problem( const __GLcontext *ctx, const char *fmtString, ... );
 594
 595 extern void
 596 _mesa_error( __GLcontext *ctx, GLenum error, const char *fmtString, ... );
 597
 598 extern void
 599 _mesa_debug( const __GLcontext *ctx, const char *fmtString, ... );
 600
 601 #ifdef __cplusplus
 602 }
 603 #endif
 604
 605
 606 #endif /* IMPORTS_H */