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/*

 * Mesa 3-D graphics library

 * Version:  7.5

 *

 * Copyright (C) 1999-2008  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.

 */

/**

 * \file imports.h

 * Standard C library function wrappers.

 *

 * This file provides wrappers for all the standard C library functions

 * like malloc(), free(), printf(), getenv(), etc.

 */

#ifndef IMPORTS_H

#define IMPORTS_H

#include "compiler.h"

#include "glheader.h"

#ifdef __cplusplus

extern "C" {

#endif

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

/** Memory macros */

/*@{*/

/** Allocate \p BYTES bytes */

#define MALLOC(BYTES)      malloc(BYTES)

/** Allocate and zero \p BYTES bytes */

#define CALLOC(BYTES)      calloc(1, BYTES)

/** Allocate a structure of type \p T */

#define MALLOC_STRUCT(T)   (struct T *) malloc(sizeof(struct T))

/** Allocate and zero a structure of type \p T */

#define CALLOC_STRUCT(T)   (struct T *) calloc(1, sizeof(struct T))

/** Free memory */

#define FREE(PTR)          free(PTR)

/*@}*/

/*

 * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers

 * as offsets into buffer stores.  Since the vertex array pointer and

 * buffer store pointer are both pointers and we need to add them, we use

 * this macro.

 * Both pointers/offsets are expressed in bytes.

 */

#define ADD_POINTERS(A, B)  ( (GLubyte *) (A) + (uintptr_t) (B) )

/**

 * Sometimes we treat GLfloats as GLints.  On x86 systems, moving a float

 * as a int (thereby using integer registers instead of FP registers) is

 * a performance win.  Typically, this can be done with ordinary casts.

 * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)

 * these casts generate warnings.

 * The following union typedef is used to solve that.

 */

typedef union { GLfloat f; GLint i; } fi_type;

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

 * Math macros

 */

#define MAX_GLUSHORT	0xffff

#define MAX_GLUINT	0xffffffff

/* Degrees to radians conversion: */

#define DEG2RAD (M_PI/180.0)

/***

 *** SQRTF: single-precision square root

 ***/

#if 0 /* _mesa_sqrtf() not accurate enough - temporarily disabled */

#  define SQRTF(X)  _mesa_sqrtf(X)

#else

#  define SQRTF(X)  (float) sqrt((float) (X))

#endif

/***

 *** INV_SQRTF: single-precision inverse square root

 ***/

#if 0

#define INV_SQRTF(X) _mesa_inv_sqrt(X)

#else

#define INV_SQRTF(X) (1.0F / SQRTF(X))  /* this is faster on a P4 */

#endif

/**

 * \name Work-arounds for platforms that lack C99 math functions

 */

/*@{*/

#if (!defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE < 600)) && !defined(_ISOC99_SOURCE) \

   && (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L)) \

   && (!defined(_MSC_VER) || (_MSC_VER < 1400))

#define acosf(f) ((float) acos(f))

#define asinf(f) ((float) asin(f))

#define atan2f(x,y) ((float) atan2(x,y))

#define atanf(f) ((float) atan(f))

#define cielf(f) ((float) ciel(f))

#define cosf(f) ((float) cos(f))

#define coshf(f) ((float) cosh(f))

#define expf(f) ((float) exp(f))

#define exp2f(f) ((float) exp2(f))

#define floorf(f) ((float) floor(f))

#define logf(f) ((float) log(f))

#define log2f(f) ((float) log2(f))

#define powf(x,y) ((float) pow(x,y))

#define sinf(f) ((float) sin(f))

#define sinhf(f) ((float) sinh(f))

#define sqrtf(f) ((float) sqrt(f))

#define tanf(f) ((float) tan(f))

#define tanhf(f) ((float) tanh(f))

#define acoshf(f) ((float) acosh(f))

#define asinhf(f) ((float) asinh(f))

#define atanhf(f) ((float) atanh(f))

#endif

#if defined(_MSC_VER)

static INLINE float truncf(float x) { return x < 0.0f ? ceilf(x) : floorf(x); }

static INLINE float exp2f(float x) { return powf(2.0f, x); }

static INLINE float log2f(float x) { return logf(x) * 1.442695041f; }

static INLINE float asinhf(float x) { return logf(x + sqrtf(x * x + 1.0f)); }

static INLINE float acoshf(float x) { return logf(x + sqrtf(x * x - 1.0f)); }

static INLINE float atanhf(float x) { return (logf(1.0f + x) - logf(1.0f - x)) / 2.0f; }

static INLINE int isblank(int ch) { return ch == ' ' || ch == '\t'; }

#define strtoll(p, e, b) _strtoi64(p, e, b)

#endif

/*@}*/

/***

 *** LOG2: Log base 2 of float

 ***/

#ifdef USE_IEEE

#if 0

/* This is pretty fast, but not accurate enough (only 2 fractional bits).

 * Based on code from http://www.stereopsis.com/log2.html

 */

static INLINE GLfloat LOG2(GLfloat x)

{

   const GLfloat y = x * x * x * x;

   const GLuint ix = *((GLuint *) &y);

   const GLuint exp = (ix >> 23) & 0xFF;

   const GLint log2 = ((GLint) exp) - 127;

   return (GLfloat) log2 * (1.0 / 4.0);  /* 4, because of x^4 above */

}

#endif

/* Pretty fast, and accurate.

 * Based on code from http://www.flipcode.com/totd/

 */

static INLINE GLfloat LOG2(GLfloat val)

{

   fi_type num;

   GLint log_2;

   num.f = val;

   log_2 = ((num.i >> 23) & 255) - 128;

   num.i &= ~(255 << 23);

   num.i += 127 << 23;

   num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;

   return num.f + log_2;

}

#else

/*

 * NOTE: log_base_2(x) = log(x) / log(2)

 * NOTE: 1.442695 = 1/log(2).

 */

#define LOG2(x)  ((GLfloat) (log(x) * 1.442695F))

#endif

/***

 *** IS_INF_OR_NAN: test if float is infinite or NaN

 ***/

#ifdef USE_IEEE

static INLINE int IS_INF_OR_NAN( float x )

{

   fi_type tmp;

   tmp.f = x;

   return !(int)((unsigned int)((tmp.i & 0x7fffffff)-0x7f800000) >> 31);

}

#elif defined(isfinite)

#define IS_INF_OR_NAN(x)        (!isfinite(x))

#elif defined(finite)

#define IS_INF_OR_NAN(x)        (!finite(x))

#elif defined(__VMS)

#define IS_INF_OR_NAN(x)        (!finite(x))

#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L

#define IS_INF_OR_NAN(x)        (!isfinite(x))

#else

#define IS_INF_OR_NAN(x)        (!finite(x))

#endif

/***

 *** IS_NEGATIVE: test if float is negative

 ***/

#if defined(USE_IEEE)

static INLINE int GET_FLOAT_BITS( float x )

{

   fi_type fi;

   fi.f = x;

   return fi.i;

}

#define IS_NEGATIVE(x) (GET_FLOAT_BITS(x) < 0)

#else

#define IS_NEGATIVE(x) (x < 0.0F)

#endif

/***

 *** DIFFERENT_SIGNS: test if two floats have opposite signs

 ***/

#if defined(USE_IEEE)

#define DIFFERENT_SIGNS(x,y) ((GET_FLOAT_BITS(x) ^ GET_FLOAT_BITS(y)) & (1<<31))

#else

/* Could just use (x*y<0) except for the flatshading requirements.

 * Maybe there's a better way?

 */

#define DIFFERENT_SIGNS(x,y) ((x) * (y) <= 0.0F && (x) - (y) != 0.0F)

#endif

/***

 *** CEILF: ceiling of float

 *** FLOORF: floor of float

 *** FABSF: absolute value of float

 *** LOGF: the natural logarithm (base e) of the value

 *** EXPF: raise e to the value

 *** LDEXPF: multiply value by an integral power of two

 *** FREXPF: extract mantissa and exponent from value

 ***/

#if defined(__gnu_linux__)

/* C99 functions */

#define CEILF(x)   ceilf(x)

#define FLOORF(x)  floorf(x)

#define FABSF(x)   fabsf(x)

#define LOGF(x)    logf(x)

#define EXPF(x)    expf(x)

#define LDEXPF(x,y)  ldexpf(x,y)

#define FREXPF(x,y)  frexpf(x,y)

#else

#define CEILF(x)   ((GLfloat) ceil(x))

#define FLOORF(x)  ((GLfloat) floor(x))

#define FABSF(x)   ((GLfloat) fabs(x))

#define LOGF(x)    ((GLfloat) log(x))

#define EXPF(x)    ((GLfloat) exp(x))

#define LDEXPF(x,y)  ((GLfloat) ldexp(x,y))

#define FREXPF(x,y)  ((GLfloat) frexp(x,y))

#endif

/***

 *** IROUND: return (as an integer) float rounded to nearest integer

 ***/

#if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)

static INLINE int iround(float f)

{

   int r;

   __asm__ ("fistpl %0" : "=m" (r) : "t" (f) : "st");

   return r;

}

#define IROUND(x)  iround(x)

#elif defined(USE_X86_ASM) && defined(_MSC_VER)

static INLINE int iround(float f)

{

   int r;

   _asm {

	 fld f

	 fistp r

	}

   return r;

}

#define IROUND(x)  iround(x)

#elif defined(__WATCOMC__) && defined(__386__)

long iround(float f);

#pragma aux iround =                    \

	"push   eax"                        \

	"fistp  dword ptr [esp]"            \

	"pop    eax"                        \

	parm [8087]                         \

	value [eax]                         \

	modify exact [eax];

#define IROUND(x)  iround(x)

#else

#define IROUND(f)  ((int) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))

#endif

#define IROUND64(f)  ((GLint64) (((f) >= 0.0F) ? ((f) + 0.5F) : ((f) - 0.5F)))

/***

 *** IROUND_POS: return (as an integer) positive float rounded to nearest int

 ***/

#ifdef DEBUG

#define IROUND_POS(f) (assert((f) >= 0.0F), IROUND(f))

#else

#define IROUND_POS(f) (IROUND(f))

#endif

/***

 *** IFLOOR: return (as an integer) floor of float

 ***/

#if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)

/*

 * IEEE floor for computers that round to nearest or even.

 * 'f' must be between -4194304 and 4194303.

 * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",

 * but uses some IEEE specific tricks for better speed.

 * Contributed by Josh Vanderhoof

 */

static INLINE int ifloor(float f)

{

   int ai, bi;

   double af, bf;

   af = (3 << 22) + 0.5 + (double)f;

   bf = (3 << 22) + 0.5 - (double)f;

   /* GCC generates an extra fstp/fld without this. */

   __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");

   __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");

   return (ai - bi) >> 1;

}

#define IFLOOR(x)  ifloor(x)

#elif defined(USE_IEEE)

static INLINE int ifloor(float f)

{

   int ai, bi;

   double af, bf;

   fi_type u;

   af = (3 << 22) + 0.5 + (double)f;

   bf = (3 << 22) + 0.5 - (double)f;

   u.f = (float) af;  ai = u.i;

   u.f = (float) bf;  bi = u.i;

   return (ai - bi) >> 1;

}

#define IFLOOR(x)  ifloor(x)

#else

static INLINE int ifloor(float f)

{

   int i = IROUND(f);

   return (i > f) ? i - 1 : i;

}

#define IFLOOR(x)  ifloor(x)

#endif

/***

 *** ICEIL: return (as an integer) ceiling of float

 ***/

#if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)

/*

 * IEEE ceil for computers that round to nearest or even.

 * 'f' must be between -4194304 and 4194303.

 * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",

 * but uses some IEEE specific tricks for better speed.

 * Contributed by Josh Vanderhoof

 */

static INLINE int iceil(float f)

{

   int ai, bi;

   double af, bf;

   af = (3 << 22) + 0.5 + (double)f;

   bf = (3 << 22) + 0.5 - (double)f;

   /* GCC generates an extra fstp/fld without this. */

   __asm__ ("fstps %0" : "=m" (ai) : "t" (af) : "st");

   __asm__ ("fstps %0" : "=m" (bi) : "t" (bf) : "st");

   return (ai - bi + 1) >> 1;

}

#define ICEIL(x)  iceil(x)

#elif defined(USE_IEEE)

static INLINE int iceil(float f)

{

   int ai, bi;

   double af, bf;

   fi_type u;

   af = (3 << 22) + 0.5 + (double)f;

   bf = (3 << 22) + 0.5 - (double)f;

   u.f = (float) af; ai = u.i;

   u.f = (float) bf; bi = u.i;

   return (ai - bi + 1) >> 1;

}

#define ICEIL(x)  iceil(x)

#else

static INLINE int iceil(float f)

{

   int i = IROUND(f);

   return (i < f) ? i + 1 : i;

}

#define ICEIL(x)  iceil(x)

#endif

/**

 * Is x a power of two?

 */

static INLINE int

_mesa_is_pow_two(int x)

{

   return !(x & (x - 1));

}

/**

 * Round given integer to next higer power of two

 * If X is zero result is undefined.

 *

 * Source for the fallback implementation is

 * Sean Eron Anderson's webpage "Bit Twiddling Hacks"

 * http://graphics.stanford.edu/~seander/bithacks.html

 *

 * When using builtin function have to do some work

 * for case when passed values 1 to prevent hiting

 * undefined result from __builtin_clz. Undefined

 * results would be different depending on optimization

 * level used for build.

 */

static INLINE int32_t

_mesa_next_pow_two_32(uint32_t x)

{

#if defined(__GNUC__) && \

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

	uint32_t y = (x != 1);

	return (1 + y) << ((__builtin_clz(x - y) ^ 31) );

#else

	x--;

	x |= x >> 1;

	x |= x >> 2;

	x |= x >> 4;

	x |= x >> 8;

	x |= x >> 16;

	x++;

	return x;

#endif

}

static INLINE int64_t

_mesa_next_pow_two_64(uint64_t x)

{

#if defined(__GNUC__) && \

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

	uint64_t y = (x != 1);

	if (sizeof(x) == sizeof(long))

		return (1 + y) << ((__builtin_clzl(x - y) ^ 63));

	else

		return (1 + y) << ((__builtin_clzll(x - y) ^ 63));

#else

	x--;

	x |= x >> 1;

	x |= x >> 2;

	x |= x >> 4;

	x |= x >> 8;

	x |= x >> 16;

	x |= x >> 32;

	x++;

	return x;

#endif

}

/**

 * Return 1 if this is a little endian machine, 0 if big endian.

 */

static INLINE GLboolean

_mesa_little_endian(void)

{

   const GLuint ui = 1; /* intentionally not static */

   return *((const GLubyte *) &ui);

}

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

 * Functions

 */

extern void *

_mesa_align_malloc( size_t bytes, unsigned long alignment );

extern void *

_mesa_align_calloc( size_t bytes, unsigned long alignment );

extern void

_mesa_align_free( void *ptr );

extern void *

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

                    unsigned long alignment);

extern void *

_mesa_exec_malloc( GLuint size );

extern void

_mesa_exec_free( void *addr );

extern void *

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

extern void

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

extern double

_mesa_sqrtd(double x);

extern float

_mesa_sqrtf(float x);

extern float

_mesa_inv_sqrtf(float x);

extern void

_mesa_init_sqrt_table(void);

extern int

_mesa_ffs(int32_t i);

extern int

_mesa_ffsll(int64_t i);

extern unsigned int

_mesa_bitcount(unsigned int n);

extern GLhalfARB

_mesa_float_to_half(float f);

extern float

_mesa_half_to_float(GLhalfARB h);

extern void *

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

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

extern char *

_mesa_getenv( const char *var );

extern char *

_mesa_strdup( const char *s );

extern float

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

extern unsigned int

_mesa_str_checksum(const char *str);

extern int

_mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);

struct gl_context;

extern void

_mesa_warning( struct gl_context *gc, const char *fmtString, ... ) PRINTFLIKE(2, 3);

extern void

_mesa_problem( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLIKE(2, 3);

extern void

_mesa_error( struct gl_context *ctx, GLenum error, const char *fmtString, ... ) PRINTFLIKE(3, 4);

extern void

_mesa_debug( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLIKE(2, 3);

#if defined(_MSC_VER) && !defined(snprintf)

#define snprintf _snprintf

#endif

#ifdef __cplusplus

}

#endif

#endif /* IMPORTS_H */