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  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.  * \name Work-arounds for platforms that lack C99 math functions
  121.  */
  122. /*@{*/
  123. #if (!defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE < 600)) && !defined(_ISOC99_SOURCE) \
  124.    && (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)) \
  125.    && (!defined(_MSC_VER) || (_MSC_VER < 1400))
  126. #define acosf(f) ((float) acos(f))
  127. #define asinf(f) ((float) asin(f))
  128. #define atan2f(x,y) ((float) atan2(x,y))
  129. #define atanf(f) ((float) atan(f))
  130. #define cielf(f) ((float) ciel(f))
  131. #define cosf(f) ((float) cos(f))
  132. #define coshf(f) ((float) cosh(f))
  133. #define expf(f) ((float) exp(f))
  134. #define exp2f(f) ((float) exp2(f))
  135. #define floorf(f) ((float) floor(f))
  136. #define logf(f) ((float) log(f))
  137. #define log2f(f) ((float) log2(f))
  138. #define powf(x,y) ((float) pow(x,y))
  139. #define sinf(f) ((float) sin(f))
  140. #define sinhf(f) ((float) sinh(f))
  141. #define sqrtf(f) ((float) sqrt(f))
  142. #define tanf(f) ((float) tan(f))
  143. #define tanhf(f) ((float) tanh(f))
  144. #define acoshf(f) ((float) acosh(f))
  145. #define asinhf(f) ((float) asinh(f))
  146. #define atanhf(f) ((float) atanh(f))
  147. #endif
  148.  
  149. #if defined(_MSC_VER)
  150. static INLINE float truncf(float x) { return x < 0.0f ? ceilf(x) : floorf(x); }
  151. static INLINE float exp2f(float x) { return powf(2.0f, x); }
  152. static INLINE float log2f(float x) { return logf(x) * 1.442695041f; }
  153. static INLINE float asinhf(float x) { return logf(x + sqrtf(x * x + 1.0f)); }
  154. static INLINE float acoshf(float x) { return logf(x + sqrtf(x * x - 1.0f)); }
  155. static INLINE float atanhf(float x) { return (logf(1.0f + x) - logf(1.0f - x)) / 2.0f; }
  156. static INLINE int isblank(int ch) { return ch == ' ' || ch == '\t'; }
  157. #define strtoll(p, e, b) _strtoi64(p, e, b)
  158. #endif
  159. /*@}*/
  160.  
  161. /***
  162.  *** LOG2: Log base 2 of float
  163.  ***/
  164. #ifdef USE_IEEE
  165. #if 0
  166. /* This is pretty fast, but not accurate enough (only 2 fractional bits).
  167.  * Based on code from http://www.stereopsis.com/log2.html
  168.  */
  169. static INLINE GLfloat LOG2(GLfloat x)
  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. }
  177. #endif
  178. /* Pretty fast, and accurate.
  179.  * Based on code from http://www.flipcode.com/totd/
  180.  */
  181. static INLINE GLfloat LOG2(GLfloat val)
  182. {
  183.    fi_type num;
  184.    GLint log_2;
  185.    num.f = val;
  186.    log_2 = ((num.i >> 23) & 255) - 128;
  187.    num.i &= ~(255 << 23);
  188.    num.i += 127 << 23;
  189.    num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
  190.    return num.f + log_2;
  191. }
  192. #else
  193. /*
  194.  * NOTE: log_base_2(x) = log(x) / log(2)
  195.  * NOTE: 1.442695 = 1/log(2).
  196.  */
  197. #define LOG2(x)  ((GLfloat) (log(x) * 1.442695F))
  198. #endif
  199.  
  200.  
  201. /***
  202.  *** IS_INF_OR_NAN: test if float is infinite or NaN
  203.  ***/
  204. #ifdef USE_IEEE
  205. static INLINE int IS_INF_OR_NAN( float x )
  206. {
  207.    fi_type tmp;
  208.    tmp.f = x;
  209.    return !(int)((unsigned int)((tmp.i & 0x7fffffff)-0x7f800000) >> 31);
  210. }
  211. #elif defined(isfinite)
  212. #define IS_INF_OR_NAN(x)        (!isfinite(x))
  213. #elif defined(finite)
  214. #define IS_INF_OR_NAN(x)        (!finite(x))
  215. #elif defined(__VMS)
  216. #define IS_INF_OR_NAN(x)        (!finite(x))
  217. #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
  218. #define IS_INF_OR_NAN(x)        (!isfinite(x))
  219. #else
  220. #define IS_INF_OR_NAN(x)        (!finite(x))
  221. #endif
  222.  
  223.  
  224. /***
  225.  *** IS_NEGATIVE: test if float is negative
  226.  ***/
  227. #if defined(USE_IEEE)
  228. static INLINE int GET_FLOAT_BITS( float x )
  229. {
  230.    fi_type fi;
  231.    fi.f = x;
  232.    return fi.i;
  233. }
  234. #define IS_NEGATIVE(x) (GET_FLOAT_BITS(x) < 0)
  235. #else
  236. #define IS_NEGATIVE(x) (x < 0.0F)
  237. #endif
  238.  
  239.  
  240. /***
  241.  *** DIFFERENT_SIGNS: test if two floats have opposite signs
  242.  ***/
  243. #if defined(USE_IEEE)
  244. #define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))
  245. #else
  246. /* Could just use (x*y<0) except for the flatshading requirements.
  247.  * Maybe there's a better way?
  248.  */
  249. #define DIFFERENT_SIGNS(x,y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)
  250. #endif
  251.  
  252.  
  253. /***
  254.  *** CEILF: ceiling of float
  255.  *** FLOORF: floor of float
  256.  *** FABSF: absolute value of float
  257.  *** LOGF: the natural logarithm (base e) of the value
  258.  *** EXPF: raise e to the value
  259.  *** LDEXPF: multiply value by an integral power of two
  260.  *** FREXPF: extract mantissa and exponent from value
  261.  ***/
  262. #if defined(__gnu_linux__)
  263. /* C99 functions */
  264. #define CEILF(x)   ceilf(x)
  265. #define FLOORF(x)  floorf(x)
  266. #define FABSF(x)   fabsf(x)
  267. #define LOGF(x)    logf(x)
  268. #define EXPF(x)    expf(x)
  269. #define LDEXPF(x,y)  ldexpf(x,y)
  270. #define FREXPF(x,y)  frexpf(x,y)
  271. #else
  272. #define CEILF(x)   ((GLfloat) ceil(x))
  273. #define FLOORF(x)  ((GLfloat) floor(x))
  274. #define FABSF(x)   ((GLfloat) fabs(x))
  275. #define LOGF(x)    ((GLfloat) log(x))
  276. #define EXPF(x)    ((GLfloat) exp(x))
  277. #define LDEXPF(x,y)  ((GLfloat) ldexp(x,y))
  278. #define FREXPF(x,y)  ((GLfloat) frexp(x,y))
  279. #endif
  280.  
  281.  
  282. /***
  283.  *** IROUND: return (as an integer) float rounded to nearest integer
  284.  ***/
  285. #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
  286. static INLINE int iround(float f)
  287. {
  288.    int r;
  289.    __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");
  290.    return r;
  291. }
  292. #define IROUND(x)  iround(x)
  293. #elif defined(USE_X86_ASM) && defined(_MSC_VER)
  294. static INLINE int iround(float f)
  295. {
  296.    int r;
  297.    _asm {
  298.          fld f
  299.          fistp r
  300.         }
  301.    return r;
  302. }
  303. #define IROUND(x)  iround(x)
  304. #elif defined(__WATCOMC__) && defined(__386__)
  305. long iround(float f);
  306. #pragma aux iround =                    \
  307.         "push   eax"                        \
  308.         "fistp  dword ptr [esp]"            \
  309.         "pop    eax"                        \
  310.         parm [8087]                         \
  311.         value [eax]                         \
  312.         modify exact [eax];
  313. #define IROUND(x)  iround(x)
  314. #else
  315. #define IROUND(f)  ((int) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))
  316. #endif
  317.  
  318. #define IROUND64(f)  ((GLint64) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))
  319.  
  320. /***
  321.  *** IROUND_POS: return (as an integer) positive float rounded to nearest int
  322.  ***/
  323. #ifdef DEBUG
  324. #define IROUND_POS(f) (assert((f) >= 0.0F), IROUND(f))
  325. #else
  326. #define IROUND_POS(f) (IROUND(f))
  327. #endif
  328.  
  329.  
  330. /***
  331.  *** IFLOOR: return (as an integer) floor of float
  332.  ***/
  333. #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
  334. /*
  335.  * IEEE floor for computers that round to nearest or even.
  336.  * 'f' must be between -4194304 and 4194303.
  337.  * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
  338.  * but uses some IEEE specific tricks for better speed.
  339.  * Contributed by Josh Vanderhoof
  340.  */
  341. static INLINE int ifloor(float f)
  342. {
  343.    int ai, bi;
  344.    double af, bf;
  345.    af = (3 << 22) + 0.5 + (double)f;
  346.    bf = (3 << 22) + 0.5 - (double)f;
  347.    /* GCC generates an extra fstp/fld without this. */
  348.    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
  349.    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
  350.    return (ai - bi) >> 1;
  351. }
  352. #define IFLOOR(x)  ifloor(x)
  353. #elif defined(USE_IEEE)
  354. static INLINE int ifloor(float f)
  355. {
  356.    int ai, bi;
  357.    double af, bf;
  358.    fi_type u;
  359.  
  360.    af = (3 << 22) + 0.5 + (double)f;
  361.    bf = (3 << 22) + 0.5 - (double)f;
  362.    u.f = (float) af;  ai = u.i;
  363.    u.f = (float) bf;  bi = u.i;
  364.    return (ai - bi) >> 1;
  365. }
  366. #define IFLOOR(x)  ifloor(x)
  367. #else
  368. static INLINE int ifloor(float f)
  369. {
  370.    int i = IROUND(f);
  371.    return (i > f) ? i - 1 : i;
  372. }
  373. #define IFLOOR(x)  ifloor(x)
  374. #endif
  375.  
  376.  
  377. /***
  378.  *** ICEIL: return (as an integer) ceiling of float
  379.  ***/
  380. #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
  381. /*
  382.  * IEEE ceil for computers that round to nearest or even.
  383.  * 'f' must be between -4194304 and 4194303.
  384.  * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",
  385.  * but uses some IEEE specific tricks for better speed.
  386.  * Contributed by Josh Vanderhoof
  387.  */
  388. static INLINE int iceil(float f)
  389. {
  390.    int ai, bi;
  391.    double af, bf;
  392.    af = (3 << 22) + 0.5 + (double)f;
  393.    bf = (3 << 22) + 0.5 - (double)f;
  394.    /* GCC generates an extra fstp/fld without this. */
  395.    __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");
  396.    __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");
  397.    return (ai - bi + 1) >> 1;
  398. }
  399. #define ICEIL(x)  iceil(x)
  400. #elif defined(USE_IEEE)
  401. static INLINE int iceil(float f)
  402. {
  403.    int ai, bi;
  404.    double af, bf;
  405.    fi_type u;
  406.    af = (3 << 22) + 0.5 + (double)f;
  407.    bf = (3 << 22) + 0.5 - (double)f;
  408.    u.f = (float) af; ai = u.i;
  409.    u.f = (float) bf; bi = u.i;
  410.    return (ai - bi + 1) >> 1;
  411. }
  412. #define ICEIL(x)  iceil(x)
  413. #else
  414. static INLINE int iceil(float f)
  415. {
  416.    int i = IROUND(f);
  417.    return (i < f) ? i + 1 : i;
  418. }
  419. #define ICEIL(x)  iceil(x)
  420. #endif
  421.  
  422.  
  423. /**
  424.  * Is x a power of two?
  425.  */
  426. static INLINE int
  427. _mesa_is_pow_two(int x)
  428. {
  429.    return !(x & (x - 1));
  430. }
  431.  
  432. /**
  433.  * Round given integer to next higer power of two
  434.  * If X is zero result is undefined.
  435.  *
  436.  * Source for the fallback implementation is
  437.  * Sean Eron Anderson's webpage "Bit Twiddling Hacks"
  438.  * http://graphics.stanford.edu/~seander/bithacks.html
  439.  *
  440.  * When using builtin function have to do some work
  441.  * for case when passed values 1 to prevent hiting
  442.  * undefined result from __builtin_clz. Undefined
  443.  * results would be different depending on optimization
  444.  * level used for build.
  445.  */
  446. static INLINE int32_t
  447. _mesa_next_pow_two_32(uint32_t x)
  448. {
  449. #if defined(__GNUC__) && \
  450.         ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
  451.         uint32_t y = (x != 1);
  452.         return (1 + y) << ((__builtin_clz(x - y) ^ 31) );
  453. #else
  454.         x--;
  455.         x |= x >> 1;
  456.         x |= x >> 2;
  457.         x |= x >> 4;
  458.         x |= x >> 8;
  459.         x |= x >> 16;
  460.         x++;
  461.         return x;
  462. #endif
  463. }
  464.  
  465. static INLINE int64_t
  466. _mesa_next_pow_two_64(uint64_t x)
  467. {
  468. #if defined(__GNUC__) && \
  469.         ((__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)
  470.         uint64_t y = (x != 1);
  471.         if (sizeof(x) == sizeof(long))
  472.                 return (1 + y) << ((__builtin_clzl(x - y) ^ 63));
  473.         else
  474.                 return (1 + y) << ((__builtin_clzll(x - y) ^ 63));
  475. #else
  476.         x--;
  477.         x |= x >> 1;
  478.         x |= x >> 2;
  479.         x |= x >> 4;
  480.         x |= x >> 8;
  481.         x |= x >> 16;
  482.         x |= x >> 32;
  483.         x++;
  484.         return x;
  485. #endif
  486. }
  487.  
  488.  
  489. /**
  490.  * Return 1 if this is a little endian machine, 0 if big endian.
  491.  */
  492. static INLINE GLboolean
  493. _mesa_little_endian(void)
  494. {
  495.    const GLuint ui = 1; /* intentionally not static */
  496.    return *((const GLubyte *) &ui);
  497. }
  498.  
  499.  
  500.  
  501. /**********************************************************************
  502.  * Functions
  503.  */
  504.  
  505. extern void *
  506. _mesa_align_malloc( size_t bytes, unsigned long alignment );
  507.  
  508. extern void *
  509. _mesa_align_calloc( size_t bytes, unsigned long alignment );
  510.  
  511. extern void
  512. _mesa_align_free( void *ptr );
  513.  
  514. extern void *
  515. _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
  516.                     unsigned long alignment);
  517.  
  518. extern void *
  519. _mesa_exec_malloc( GLuint size );
  520.  
  521. extern void
  522. _mesa_exec_free( void *addr );
  523.  
  524. extern void *
  525. _mesa_realloc( void *oldBuffer, size_t oldSize, size_t newSize );
  526.  
  527. extern void
  528. _mesa_memset16( unsigned short *dst, unsigned short val, size_t n );
  529.  
  530. extern double
  531. _mesa_sqrtd(double x);
  532.  
  533. extern float
  534. _mesa_sqrtf(float x);
  535.  
  536. extern float
  537. _mesa_inv_sqrtf(float x);
  538.  
  539. extern void
  540. _mesa_init_sqrt_table(void);
  541.  
  542. extern int
  543. _mesa_ffs(int32_t i);
  544.  
  545. extern int
  546. _mesa_ffsll(int64_t i);
  547.  
  548. extern unsigned int
  549. _mesa_bitcount(unsigned int n);
  550.  
  551. extern GLhalfARB
  552. _mesa_float_to_half(float f);
  553.  
  554. extern float
  555. _mesa_half_to_float(GLhalfARB h);
  556.  
  557.  
  558. extern void *
  559. _mesa_bsearch( const void *key, const void *base, size_t nmemb, size_t size,
  560.                int (*compar)(const void *, const void *) );
  561.  
  562. extern char *
  563. _mesa_getenv( const char *var );
  564.  
  565. extern char *
  566. _mesa_strdup( const char *s );
  567.  
  568. extern float
  569. _mesa_strtof( const char *s, char **end );
  570.  
  571. extern unsigned int
  572. _mesa_str_checksum(const char *str);
  573.  
  574. extern int
  575. _mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);
  576.  
  577. struct gl_context;
  578.  
  579. extern void
  580. _mesa_warning( struct gl_context *gc, const char *fmtString, ... ) PRINTFLIKE(2, 3);
  581.  
  582. extern void
  583. _mesa_problem( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLIKE(2, 3);
  584.  
  585. extern void
  586. _mesa_error( struct gl_context *ctx, GLenum error, const char *fmtString, ... ) PRINTFLIKE(3, 4);
  587.  
  588. extern void
  589. _mesa_debug( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLIKE(2, 3);
  590.  
  591.  
  592. #if defined(_MSC_VER) && !defined(snprintf)
  593. #define snprintf _snprintf
  594. #endif
  595.  
  596.  
  597. #ifdef __cplusplus
  598. }
  599. #endif
  600.  
  601.  
  602. #endif /* IMPORTS_H */
  603.