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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

 * Version:  7.1

 *

 * 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

 * BRIAN PAUL 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 "version.h"

#ifdef _GNU_SOURCE

#include 

#ifdef __APPLE__

#include 

#endif

#endif

#undef _WIN32

#define MAXSTRING 4000  /* for vsnprintf() */

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

/** \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);

   if (oldBuffer)

      free(oldBuffer);

   return newBuffer;

}

/**

 * Fill memory with a constant 16bit word.

 * \param dst destination pointer.

 * \param val value.

 * \param n number of words.

 */

void

_mesa_memset16( unsigned short *dst, unsigned short val, size_t n )

{

   while (n-- > 0)

      *dst++ = val;

}

/*@}*/

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

/** \name Math */

/*@{*/

/** Wrapper around sqrt() */

double

_mesa_sqrtd(double x)

{

   return sqrt(x);

}

/*

 * A High Speed, Low Precision Square Root

 * by Paul Lalonde and Robert Dawson

 * from "Graphics Gems", Academic Press, 1990

 *

 * SPARC implementation of a fast square root by table

 * lookup.

 * SPARC floating point format is as follows:

 *

 * BIT 31 	30 	23 	22 	0

 *     sign	exponent	mantissa

 */

static short sqrttab[0x100];    /* declare table of square roots */

void

_mesa_init_sqrt_table(void)

{

#if defined(USE_IEEE) && !defined(DEBUG)

   unsigned short i;

   fi_type fi;     /* to access the bits of a float in  C quickly  */

                   /* we use a union defined in glheader.h         */

   for(i=0; i<= 0x7f; i++) {

      fi.i = 0;

      /*

       * Build a float with the bit pattern i as mantissa

       * and an exponent of 0, stored as 127

       */

      fi.i = (i << 16) | (127 << 23);

      fi.f = _mesa_sqrtd(fi.f);

      /*

       * Take the square root then strip the first 7 bits of

       * the mantissa into the table

       */

      sqrttab[i] = (fi.i & 0x7fffff) >> 16;

      /*

       * Repeat the process, this time with an exponent of

       * 1, stored as 128

       */

      fi.i = 0;

      fi.i = (i << 16) | (128 << 23);

      fi.f = sqrt(fi.f);

      sqrttab[i+0x80] = (fi.i & 0x7fffff) >> 16;

   }

#else

   (void) sqrttab;  /* silence compiler warnings */

#endif /*HAVE_FAST_MATH*/

}

/**

 * Single precision square root.

 */

float

_mesa_sqrtf( float x )

{

#if defined(USE_IEEE) && !defined(DEBUG)

   fi_type num;

                                /* to access the bits of a float in C

                                 * we use a union from glheader.h     */

   short e;                     /* the exponent */

   if (x == 0.0F) return 0.0F;  /* check for square root of 0 */

   num.f = x;

   e = (num.i >> 23) - 127;     /* get the exponent - on a SPARC the */

                                /* exponent is stored with 127 added */

   num.i &= 0x7fffff;           /* leave only the mantissa */

   if (e & 0x01) num.i |= 0x800000;

                                /* the exponent is odd so we have to */

                                /* look it up in the second half of  */

                                /* the lookup table, so we set the   */

                                /* high bit                                */

   e >>= 1;                     /* divide the exponent by two */

                                /* note that in C the shift */

                                /* operators are sign preserving */

                                /* for signed operands */

   /* Do the table lookup, based on the quaternary mantissa,

    * then reconstruct the result back into a float

    */

   num.i = ((sqrttab[num.i >> 16]) << 16) | ((e + 127) << 23);

   return num.f;

#else

   return (float) _mesa_sqrtd((double) x);

#endif

}

/**

 inv_sqrt - A single precision 1/sqrt routine for IEEE format floats.

 written by Josh Vanderhoof, based on newsgroup posts by James Van Buskirk

 and Vesa Karvonen.

*/

float

_mesa_inv_sqrtf(float n)

{

#if defined(USE_IEEE) && !defined(DEBUG)

        float r0, x0, y0;

        float r1, x1, y1;

        float r2, x2, y2;

#if 0 /* not used, see below -BP */

        float r3, x3, y3;

#endif

        fi_type u;

        unsigned int magic;

        /*

         Exponent part of the magic number -

         We want to:

         1. subtract the bias from the exponent,

         2. negate it

         3. divide by two (rounding towards -inf)

         4. add the bias back

         Which is the same as subtracting the exponent from 381 and dividing

         by 2.

         floor(-(x - 127) / 2) + 127 = floor((381 - x) / 2)

        */

        magic = 381 << 23;

        /*

         Significand part of magic number -

         With the current magic number, "(magic - u.i) >> 1" will give you:

         for 1 <= u.f <= 2: 1.25 - u.f / 4

         for 2 <= u.f <= 4: 1.00 - u.f / 8

         This isn't a bad approximation of 1/sqrt.  The maximum difference from

         1/sqrt will be around .06.  After three Newton-Raphson iterations, the

         maximum difference is less than 4.5e-8.  (Which is actually close

         enough to make the following bias academic...)

         To get a better approximation you can add a bias to the magic

         number.  For example, if you subtract 1/2 of the maximum difference in

         the first approximation (.03), you will get the following function:

         for 1 <= u.f <= 2:    1.22 - u.f / 4

         for 2 <= u.f <= 3.76: 0.97 - u.f / 8

         for 3.76 <= u.f <= 4: 0.72 - u.f / 16

         (The 3.76 to 4 range is where the result is < .5.)

         This is the closest possible initial approximation, but with a maximum

         error of 8e-11 after three NR iterations, it is still not perfect.  If

         you subtract 0.0332281 instead of .03, the maximum error will be

         2.5e-11 after three NR iterations, which should be about as close as

         is possible.

         for 1 <= u.f <= 2:    1.2167719 - u.f / 4

         for 2 <= u.f <= 3.73: 0.9667719 - u.f / 8

         for 3.73 <= u.f <= 4: 0.7167719 - u.f / 16

        */

        magic -= (int)(0.0332281 * (1 << 25));

        u.f = n;

        u.i = (magic - u.i) >> 1;

        /*

         Instead of Newton-Raphson, we use Goldschmidt's algorithm, which

         allows more parallelism.  From what I understand, the parallelism

         comes at the cost of less precision, because it lets error

         accumulate across iterations.

        */

        x0 = 1.0f;

        y0 = 0.5f * n;

        r0 = u.f;

        x1 = x0 * r0;

        y1 = y0 * r0 * r0;

        r1 = 1.5f - y1;

        x2 = x1 * r1;

        y2 = y1 * r1 * r1;

        r2 = 1.5f - y2;

#if 1

        return x2 * r2;  /* we can stop here, and be conformant -BP */

#else

        x3 = x2 * r2;

        y3 = y2 * r2 * r2;

        r3 = 1.5f - y3;

        return x3 * r3;

#endif

#else

        return (float) (1.0 / sqrt(n));

#endif

}

/**

 * Find the first bit set in a word.

 */

int

_mesa_ffs(int32_t i)

{

#if (defined(_WIN32) ) || defined(__IBMC__) || defined(__IBMCPP__)

   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;

#else

   return __builtin_ffs(i);

#endif

}

/**

 * 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

_mesa_ffsll(int64_t val)

{

#ifdef ffsll

   return ffsll(val);

#else

   int bit;

   assert(sizeof(val) == 8);

   bit = _mesa_ffs((int32_t)val);

   if (bit != 0)

      return bit;

   bit = _mesa_ffs((int32_t)(val >> 32));

   if (bit != 0)

      return 32 + bit;

   return 0;

#endif

}

/**

 * Return number of bits set in given GLuint.

 */

unsigned int

_mesa_bitcount(unsigned int n)

{

#if defined(__GNUC__) && \

	((_GNUC__ == 3 && __GNUC_MINOR__ >= 4) || __GNUC__ >= 4)

   return __builtin_popcount(n);

#else

   unsigned int bits;

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

      bits += (n & 1);

   }

   return bits;

#endif

}

/**

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

 * Based on code from:

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

 */

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 < -24) {

         /* this maps to 0 */

         /* m = 0; - already set */

         e = 0;

      }

      else if (new_exp < -14) {

         /* this maps to a denorm */

         unsigned int exp_val = (unsigned int) (-14 - new_exp); /* 2^-exp_val*/

         e = 0;

         switch (exp_val) {

            case 0:

               _mesa_warning(NULL,

                   "float_to_half: logical error in denorm creation!\n");

               /* m = 0; - already set */

               break;

            case 1: m = 512 + (flt_m >> 14); break;

            case 2: m = 256 + (flt_m >> 15); break;

            case 3: m = 128 + (flt_m >> 16); break;

            case 4: m = 64 + (flt_m >> 17); break;

            case 5: m = 32 + (flt_m >> 18); break;

            case 6: m = 16 + (flt_m >> 19); break;

            case 7: m = 8 + (flt_m >> 20); break;

            case 8: m = 4 + (flt_m >> 21); break;

            case 9: m = 2 + (flt_m >> 22); break;

            case 10: m = 1; break;

         }

      }

      else if (new_exp > 15) {

         /* map this value to infinity */

         /* m = 0; - already set */

         e = 31;

      }

      else {

         /* regular */

         e = new_exp + 15;

         m = flt_m >> 13;

      }

   }

   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 = (char *) 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__)

   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;

}

/*@}*/

/** 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;

}

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

/** \name Diagnostics */

/*@{*/

static void

output_if_debug(const char *prefixString, const char *outputString,

                GLboolean newline)

{

   static int debug = -1;

   /* Check the MESA_DEBUG environment variable if it hasn't

    * been checked yet.  We only have to check it once...

    */

   if (debug == -1) {

      char *env = _mesa_getenv("MESA_DEBUG");

      /* In a debug build, we print warning messages *unless*

       * MESA_DEBUG is 0.  In a non-debug build, we don't

       * print warning messages *unless* MESA_DEBUG is

       * set *to any value*.

       */

#ifdef DEBUG

      debug = (env != NULL && atoi(env) == 0) ? 0 : 1;

#else

      debug = (env != NULL) ? 1 : 0;

#endif

   }

   /* Now only print the string if we're required to do so. */

   if (debug) {

      fprintf(stderr, "%s: %s", prefixString, outputString);

      if (newline)

         fprintf(stderr, "\n");

#if defined(_WIN32) && !defined(_WIN32_WCE)

      /* stderr from windows applications without console is not usually

       * visible, so communicate with the debugger instead */

      {

         char buf[4096];

         _mesa_snprintf(buf, sizeof(buf), "%s: %s%s", prefixString, outputString, newline ? "\n" : "");

         OutputDebugStringA(buf);

      }

#endif

   }

}

/**

 * Return string version of GL error code.

 */

static const char *

error_string( GLenum error )

{

   switch (error) {

   case GL_NO_ERROR:

      return "GL_NO_ERROR";

   case GL_INVALID_VALUE:

      return "GL_INVALID_VALUE";

   case GL_INVALID_ENUM:

      return "GL_INVALID_ENUM";

   case GL_INVALID_OPERATION:

      return "GL_INVALID_OPERATION";

   case GL_STACK_OVERFLOW:

      return "GL_STACK_OVERFLOW";

   case GL_STACK_UNDERFLOW:

      return "GL_STACK_UNDERFLOW";

   case GL_OUT_OF_MEMORY:

      return "GL_OUT_OF_MEMORY";

   case GL_TABLE_TOO_LARGE:

      return "GL_TABLE_TOO_LARGE";

   case GL_INVALID_FRAMEBUFFER_OPERATION_EXT:

      return "GL_INVALID_FRAMEBUFFER_OPERATION";

   default:

      return "unknown";

   }

}

/**

 * When a new type of error is recorded, print a message describing

 * previous errors which were accumulated.

 */

static void

flush_delayed_errors( struct gl_context *ctx )

{

   char s[MAXSTRING];

   if (ctx->ErrorDebugCount) {

      _mesa_snprintf(s, MAXSTRING, "%d similar %s errors",

                     ctx->ErrorDebugCount,

                     error_string(ctx->ErrorValue));

      output_if_debug("Mesa", s, GL_TRUE);

      ctx->ErrorDebugCount = 0;

   }

}

/**

 * Report a warning (a recoverable error condition) to stderr if

 * either DEBUG is defined or the MESA_DEBUG env var is set.

 *

 * \param ctx GL context.

 * \param fmtString printf()-like format string.

 */

void

_mesa_warning( struct gl_context *ctx, const char *fmtString, ... )

{

   char str[MAXSTRING];

   va_list args;

   va_start( args, fmtString );

   (void) vsnprintf( str, MAXSTRING, fmtString, args );

   va_end( args );

   if (ctx)

      flush_delayed_errors( ctx );

   output_if_debug("Mesa warning", str, GL_TRUE);

}

/**

 * Report an internal implementation problem.

 * Prints the message to stderr via fprintf().

 *

 * \param ctx GL context.

 * \param fmtString problem description string.

 */

void

_mesa_problem( const struct gl_context *ctx, const char *fmtString, ... )

{

   va_list args;

   char str[MAXSTRING];

   (void) ctx;

   va_start( args, fmtString );

   vsnprintf( str, MAXSTRING, fmtString, args );

   va_end( args );

   fprintf(stderr, "Mesa %s implementation error: %s\n", MESA_VERSION_STRING, str);

   fprintf(stderr, "Please report at bugs.freedesktop.org\n");

}

/**

 * Record an OpenGL state error.  These usually occur when the user

 * passes invalid parameters to a GL function.

 *

 * If debugging is enabled (either at compile-time via the DEBUG macro, or

 * run-time via the MESA_DEBUG environment variable), report the error with

 * _mesa_debug().

 *

 * \param ctx the GL context.

 * \param error the error value.

 * \param fmtString printf() style format string, followed by optional args

 */

void

_mesa_error( struct gl_context *ctx, GLenum error, const char *fmtString, ... )

{

   static GLint debug = -1;

   /* Check debug environment variable only once:

    */

   if (debug == -1) {

      const char *debugEnv = _mesa_getenv("MESA_DEBUG");

#ifdef DEBUG

      if (debugEnv && strstr(debugEnv, "silent"))

         debug = GL_FALSE;

      else

         debug = GL_TRUE;

#else

      if (debugEnv)

         debug = GL_TRUE;

      else

         debug = GL_FALSE;

#endif

   }

   if (debug) {

      if (ctx->ErrorValue == error &&

          ctx->ErrorDebugFmtString == fmtString) {

         ctx->ErrorDebugCount++;

      }

      else {

         char s[MAXSTRING], s2[MAXSTRING];

         va_list args;

         flush_delayed_errors( ctx );

         va_start(args, fmtString);

         vsnprintf(s, MAXSTRING, fmtString, args);

         va_end(args);

         _mesa_snprintf(s2, MAXSTRING, "%s in %s", error_string(error), s);

         output_if_debug("Mesa: User error", s2, GL_TRUE);

         ctx->ErrorDebugFmtString = fmtString;

         ctx->ErrorDebugCount = 0;

      }

   }

   _mesa_record_error(ctx, error);

}

/**

 * Report debug information.  Print error message to stderr via fprintf().

 * No-op if DEBUG mode not enabled.

 *

 * \param ctx GL context.

 * \param fmtString printf()-style format string, followed by optional args.

 */

void

_mesa_debug( const struct gl_context *ctx, const char *fmtString, ... )

{

#ifdef DEBUG

   char s[MAXSTRING];

   va_list args;

   va_start(args, fmtString);

   vsnprintf(s, MAXSTRING, fmtString, args);

   va_end(args);

   output_if_debug("Mesa", s, GL_FALSE);

#endif /* DEBUG */

   (void) ctx;

   (void) fmtString;

}

/*@}*/