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/**

 * \file imports.c

 * Standard C library function wrappers.

 *

 * Imports are services which the device driver or window system or

 * operating system provides to the core renderer.  The core renderer (Mesa)

 * will call these functions in order to do memory allocation, simple I/O,

 * etc.

 *

 * Some drivers will want to override/replace this file with something

 * specialized, but that'll be rare.

 *

 * Eventually, I want to move roll the glheader.h file into this.

 *

 * \todo Functions still needed:

 * - scanf

 * - qsort

 * - rand and RAND_MAX

 */

/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

#include "imports.h"

#include "context.h"

#include "mtypes.h"

#include "version.h"

#ifdef _GNU_SOURCE

#include 

#ifdef __APPLE__

#include 

#endif

#endif

#ifdef _WIN32

#define vsnprintf _vsnprintf

#elif defined(__IBMC__) || defined(__IBMCPP__)

extern int vsnprintf(char *str, size_t count, const char *fmt, va_list arg);

#endif

/**********************************************************************/

/** \name Memory */

/*@{*/

/**

 * Allocate aligned memory.

 *

 * \param bytes number of bytes to allocate.

 * \param alignment alignment (must be greater than zero).

 *

 * Allocates extra memory to accommodate rounding up the address for

 * alignment and to record the real malloc address.

 *

 * \sa _mesa_align_free().

 */

void *

_mesa_align_malloc(size_t bytes, unsigned long alignment)

{

#if defined(HAVE_POSIX_MEMALIGN)

   void *mem;

   int err = posix_memalign(& mem, alignment, bytes);

   if (err)

      return NULL;

   return mem;

#elif defined(_WIN32) && defined(_MSC_VER)

   return _aligned_malloc(bytes, alignment);

#else

   uintptr_t ptr, buf;

   ASSERT( alignment > 0 );

   ptr = (uintptr_t)malloc(bytes + alignment + sizeof(void *));

   if (!ptr)

      return NULL;

   buf = (ptr + alignment + sizeof(void *)) & ~(uintptr_t)(alignment - 1);

   *(uintptr_t *)(buf - sizeof(void *)) = ptr;

#ifdef DEBUG

   /* mark the non-aligned area */

   while ( ptr < buf - sizeof(void *) ) {

      *(unsigned long *)ptr = 0xcdcdcdcd;

      ptr += sizeof(unsigned long);

   }

#endif

   return (void *) buf;

#endif /* defined(HAVE_POSIX_MEMALIGN) */

}

/**

 * Same as _mesa_align_malloc(), but using calloc(1, ) instead of

 * malloc()

 */

void *

_mesa_align_calloc(size_t bytes, unsigned long alignment)

{

#if defined(HAVE_POSIX_MEMALIGN)

   void *mem;

   mem = _mesa_align_malloc(bytes, alignment);

   if (mem != NULL) {

      (void) memset(mem, 0, bytes);

   }

   return mem;

#elif defined(_WIN32) && defined(_MSC_VER)

   void *mem;

   mem = _aligned_malloc(bytes, alignment);

   if (mem != NULL) {

      (void) memset(mem, 0, bytes);

   }

   return mem;

#else

   uintptr_t ptr, buf;

   ASSERT( alignment > 0 );

   ptr = (uintptr_t)calloc(1, bytes + alignment + sizeof(void *));

   if (!ptr)

      return NULL;

   buf = (ptr + alignment + sizeof(void *)) & ~(uintptr_t)(alignment - 1);

   *(uintptr_t *)(buf - sizeof(void *)) = ptr;

#ifdef DEBUG

   /* mark the non-aligned area */

   while ( ptr < buf - sizeof(void *) ) {

      *(unsigned long *)ptr = 0xcdcdcdcd;

      ptr += sizeof(unsigned long);

   }

#endif

   return (void *)buf;

#endif /* defined(HAVE_POSIX_MEMALIGN) */

}

/**

 * Free memory which was allocated with either _mesa_align_malloc()

 * or _mesa_align_calloc().

 * \param ptr pointer to the memory to be freed.

 * The actual address to free is stored in the word immediately before the

 * address the client sees.

 */

void

_mesa_align_free(void *ptr)

{

#if defined(HAVE_POSIX_MEMALIGN)

   free(ptr);

#elif defined(_WIN32) && defined(_MSC_VER)

   _aligned_free(ptr);

#else

   void **cubbyHole = (void **) ((char *) ptr - sizeof(void *));

   void *realAddr = *cubbyHole;

   free(realAddr);

#endif /* defined(HAVE_POSIX_MEMALIGN) */

}

/**

 * Reallocate memory, with alignment.

 */

void *

_mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,

                    unsigned long alignment)

{

#if defined(_WIN32) && defined(_MSC_VER)

   (void) oldSize;

   return _aligned_realloc(oldBuffer, newSize, alignment);

#else

   const size_t copySize = (oldSize < newSize) ? oldSize : newSize;

   void *newBuf = _mesa_align_malloc(newSize, alignment);

   if (newBuf && oldBuffer && copySize > 0) {

      memcpy(newBuf, oldBuffer, copySize);

   }

   if (oldBuffer)

      _mesa_align_free(oldBuffer);

   return newBuf;

#endif

}

/** Reallocate memory */

void *

_mesa_realloc(void *oldBuffer, size_t oldSize, size_t newSize)

{

   const size_t copySize = (oldSize < newSize) ? oldSize : newSize;

   void *newBuffer = malloc(newSize);

   if (newBuffer && oldBuffer && copySize > 0)

      memcpy(newBuffer, oldBuffer, copySize);

   free(oldBuffer);

   return newBuffer;

}

/*@}*/

/**********************************************************************/

/** \name Math */

/*@{*/

#ifndef __GNUC__

/**

 * Find the first bit set in a word.

 */

int

ffs(int i)

{

   register int bit = 0;

   if (i != 0) {

      if ((i & 0xffff) == 0) {

         bit += 16;

         i >>= 16;

      }

      if ((i & 0xff) == 0) {

         bit += 8;

         i >>= 8;

      }

      if ((i & 0xf) == 0) {

         bit += 4;

         i >>= 4;

      }

      while ((i & 1) == 0) {

         bit++;

         i >>= 1;

      }

      bit++;

   }

   return bit;

}

/**

 * Find position of first bit set in given value.

 * XXX Warning: this function can only be used on 64-bit systems!

 * \return  position of least-significant bit set, starting at 1, return zero

 *          if no bits set.

 */

int

ffsll(long long int val)

{

   int bit;

   assert(sizeof(val) == 8);

   bit = ffs((int) val);

   if (bit != 0)

      return bit;

   bit = ffs((int) (val >> 32));

   if (bit != 0)

      return 32 + bit;

   return 0;

}

#endif /* __GNUC__ */

#if !defined(__GNUC__) ||\

   ((__GNUC__ * 100 + __GNUC_MINOR__) < 304) /* Not gcc 3.4 or later */

/**

 * Return number of bits set in given GLuint.

 */

unsigned int

_mesa_bitcount(unsigned int n)

{

   unsigned int bits;

   for (bits = 0; n > 0; n = n >> 1) {

      bits += (n & 1);

   }

   return bits;

}

/**

 * Return number of bits set in given 64-bit uint.

 */

unsigned int

_mesa_bitcount_64(uint64_t n)

{

   unsigned int bits;

   for (bits = 0; n > 0; n = n >> 1) {

      bits += (n & 1);

   }

   return bits;

}

#endif

/* Using C99 rounding functions for roundToEven() implementation is

 * difficult, because round(), rint, and nearbyint() are affected by

 * fesetenv(), which the application may have done for its own

 * purposes.  Mesa's IROUND macro is close to what we want, but it

 * rounds away from 0 on n + 0.5.

 */

int

_mesa_round_to_even(float val)

{

   int rounded = IROUND(val);

   if (val - floor(val) == 0.5) {

      if (rounded % 2 != 0)

         rounded += val > 0 ? -1 : 1;

   }

   return rounded;

}

/**

 * Convert a 4-byte float to a 2-byte half float.

 *

 * Not all float32 values can be represented exactly as a float16 value. We

 * round such intermediate float32 values to the nearest float16. When the

 * float32 lies exactly between to float16 values, we round to the one with

 * an even mantissa.

 *

 * This rounding behavior has several benefits:

 *   - It has no sign bias.

 *

 *   - It reproduces the behavior of real hardware: opcode F32TO16 in Intel's

 *     GPU ISA.

 *

 *   - By reproducing the behavior of the GPU (at least on Intel hardware),

 *     compile-time evaluation of constant packHalf2x16 GLSL expressions will

 *     result in the same value as if the expression were executed on the GPU.

 */

GLhalfARB

_mesa_float_to_half(float val)

{

   const fi_type fi = {val};

   const int flt_m = fi.i & 0x7fffff;

   const int flt_e = (fi.i >> 23) & 0xff;

   const int flt_s = (fi.i >> 31) & 0x1;

   int s, e, m = 0;

   GLhalfARB result;

   /* sign bit */

   s = flt_s;

   /* handle special cases */

   if ((flt_e == 0) && (flt_m == 0)) {

      /* zero */

      /* m = 0; - already set */

      e = 0;

   }

   else if ((flt_e == 0) && (flt_m != 0)) {

      /* denorm -- denorm float maps to 0 half */

      /* m = 0; - already set */

      e = 0;

   }

   else if ((flt_e == 0xff) && (flt_m == 0)) {

      /* infinity */

      /* m = 0; - already set */

      e = 31;

   }

   else if ((flt_e == 0xff) && (flt_m != 0)) {

      /* NaN */

      m = 1;

      e = 31;

   }

   else {

      /* regular number */

      const int new_exp = flt_e - 127;

      if (new_exp < -14) {

         /* The float32 lies in the range (0.0, min_normal16) and is rounded

          * to a nearby float16 value. The result will be either zero, subnormal,

          * or normal.

          */

         e = 0;

         m = _mesa_round_to_even((1 << 24) * fabsf(fi.f));

      }

      else if (new_exp > 15) {

         /* map this value to infinity */

         /* m = 0; - already set */

         e = 31;

      }

      else {

         /* The float32 lies in the range

          *   [min_normal16, max_normal16 + max_step16)

          * and is rounded to a nearby float16 value. The result will be

          * either normal or infinite.

          */

         e = new_exp + 15;

         m = _mesa_round_to_even(flt_m / (float) (1 << 13));

      }

   }

   assert(0 <= m && m <= 1024);

   if (m == 1024) {

      /* The float32 was rounded upwards into the range of the next exponent,

       * so bump the exponent. This correctly handles the case where f32

       * should be rounded up to float16 infinity.

       */

      ++e;

      m = 0;

   }

   result = (s << 15) | (e << 10) | m;

   return result;

}

/**

 * Convert a 2-byte half float to a 4-byte float.

 * Based on code from:

 * http://www.opengl.org/discussion_boards/ubb/Forum3/HTML/008786.html

 */

float

_mesa_half_to_float(GLhalfARB val)

{

   /* XXX could also use a 64K-entry lookup table */

   const int m = val & 0x3ff;

   const int e = (val >> 10) & 0x1f;

   const int s = (val >> 15) & 0x1;

   int flt_m, flt_e, flt_s;

   fi_type fi;

   float result;

   /* sign bit */

   flt_s = s;

   /* handle special cases */

   if ((e == 0) && (m == 0)) {

      /* zero */

      flt_m = 0;

      flt_e = 0;

   }

   else if ((e == 0) && (m != 0)) {

      /* denorm -- denorm half will fit in non-denorm single */

      const float half_denorm = 1.0f / 16384.0f; /* 2^-14 */

      float mantissa = ((float) (m)) / 1024.0f;

      float sign = s ? -1.0f : 1.0f;

      return sign * mantissa * half_denorm;

   }

   else if ((e == 31) && (m == 0)) {

      /* infinity */

      flt_e = 0xff;

      flt_m = 0;

   }

   else if ((e == 31) && (m != 0)) {

      /* NaN */

      flt_e = 0xff;

      flt_m = 1;

   }

   else {

      /* regular */

      flt_e = e + 112;

      flt_m = m << 13;

   }

   fi.i = (flt_s << 31) | (flt_e << 23) | flt_m;

   result = fi.f;

   return result;

}

/*@}*/

/**********************************************************************/

/** \name Sort & Search */

/*@{*/

/**

 * Wrapper for bsearch().

 */

void *

_mesa_bsearch( const void *key, const void *base, size_t nmemb, size_t size,

               int (*compar)(const void *, const void *) )

{

#if defined(_WIN32_WCE)

   void *mid;

   int cmp;

   while (nmemb) {

      nmemb >>= 1;

      mid = (char *)base + nmemb * size;

      cmp = (*compar)(key, mid);

      if (cmp == 0)

	 return mid;

      if (cmp > 0) {

	 base = (char *)mid + size;

	 --nmemb;

      }

   }

   return NULL;

#else

   return bsearch(key, base, nmemb, size, compar);

#endif

}

/*@}*/

/**********************************************************************/

/** \name Environment vars */

/*@{*/

/**

 * Wrapper for getenv().

 */

char *

_mesa_getenv( const char *var )

{

#if defined(_XBOX) || defined(_WIN32_WCE)

   return NULL;

#else

   return getenv(var);

#endif

}

/*@}*/

/**********************************************************************/

/** \name String */

/*@{*/

/**

 * Implemented using malloc() and strcpy.

 * Note that NULL is handled accordingly.

 */

char *

_mesa_strdup( const char *s )

{

   if (s) {

      size_t l = strlen(s);

      char *s2 = malloc(l + 1);

      if (s2)

         strcpy(s2, s);

      return s2;

   }

   else {

      return NULL;

   }

}

/** Wrapper around strtof() */

float

_mesa_strtof( const char *s, char **end )

{

#if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__) && \

   !defined(ANDROID) && !defined(__HAIKU__) && !defined(__UCLIBC__)

   static locale_t loc = NULL;

   if (!loc) {

      loc = newlocale(LC_CTYPE_MASK, "C", NULL);

   }

   return strtof_l(s, end, loc);

#elif defined(_ISOC99_SOURCE) || (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)

   return strtof(s, end);

#else

   return (float)strtod(s, end);

#endif

}

/** Compute simple checksum/hash for a string */

unsigned int

_mesa_str_checksum(const char *str)

{

   /* This could probably be much better */

   unsigned int sum, i;

   const char *c;

   sum = i = 1;

   for (c = str; *c; c++, i++)

      sum += *c * (i % 100);

   return sum + i;

}

/*@}*/

/** Needed due to #ifdef's, above. */

int

_mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list args)

{

   return vsnprintf( str, size, fmt, args);

}

/** Wrapper around vsnprintf() */

int

_mesa_snprintf( char *str, size_t size, const char *fmt, ... )

{

   int r;

   va_list args;

   va_start( args, fmt );

   r = vsnprintf( str, size, fmt, args );

   va_end( args );

   return r;

}