imports.h

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

	}
   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


/***
 *** 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


/***
 *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
 *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
 ***/
#if defined(USE_IEEE) && !defined(DEBUG)
#define IEEE_0996 0x3f7f0000	/* 0.996 or so */
/* This function/macro is sensitive to precision.  Test very carefully
 * if you change it!
 */
#define UNCLAMPED_FLOAT_TO_UBYTE(UB, F)					\
        do {								\
           fi_type __tmp;						\
           __tmp.f = (F);						\
           if (__tmp.i < 0)						\
              UB = (GLubyte) 0;						\
           else if (__tmp.i >= IEEE_0996)				\
              UB = (GLubyte) 255;					\
           else {							\
              __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F;		\
              UB = (GLubyte) __tmp.i;					\
           }								\
        } while (0)
#define CLAMPED_FLOAT_TO_UBYTE(UB, F)					\
        do {								\
           fi_type __tmp;						\
           __tmp.f = (F) * (255.0F/256.0F) + 32768.0F;			\
           UB = (GLubyte) __tmp.i;					\
        } while (0)
#else
#define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \
	ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F))
#define CLAMPED_FLOAT_TO_UBYTE(ub, f) \
	ub = ((GLubyte) IROUND((f) * 255.0F))
#endif


/***
 *** COPY_FLOAT: copy a float from src to dest.
 ***/
#define COPY_FLOAT( dst, src )		(dst) = (src)


/***
 *** START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save
 ***                  original mode to a temporary).
 *** END_FAST_MATH: Restore x86 FPU to original mode.
 ***/
#if defined(__GNUC__) && defined(__i386__)
/*
 * Set the x86 FPU control word to guarentee only 32 bits of precision
 * are stored in registers.  Allowing the FPU to store more introduces
 * differences between situations where numbers are pulled out of memory
 * vs. situations where the compiler is able to optimize register usage.
 *
 * In the worst case, we force the compiler to use a memory access to
 * truncate the float, by specifying the 'volatile' keyword.
 */
/* Hardware default: All exceptions masked, extended double precision,
 * round to nearest (IEEE compliant):
 */
#define DEFAULT_X86_FPU		0x037f
/* All exceptions masked, single precision, round to nearest:
 */
#define FAST_X86_FPU		0x003f
/* The fldcw instruction will cause any pending FP exceptions to be
 * raised prior to entering the block, and we clear any pending
 * exceptions before exiting the block.  Hence, asm code has free
 * reign over the FPU while in the fast math block.
 */
#if defined(NO_FAST_MATH)
#define START_FAST_MATH(x)						\
do {									\
   static GLuint mask = DEFAULT_X86_FPU;				\
   __asm__ ( "fnstcw %0" : "=m" (*&(x)) );				\
   __asm__ ( "fldcw %0" : : "m" (mask) );				\
} while (0)
#else
#define START_FAST_MATH(x)						\
do {									\
   static GLuint mask = FAST_X86_FPU;					\
   __asm__ ( "fnstcw %0" : "=m" (*&(x)) );				\
   __asm__ ( "fldcw %0" : : "m" (mask) );				\
} while (0)
#endif
/* Restore original FPU mode, and clear any exceptions that may have
 * occurred in the FAST_MATH block.
 */
#define END_FAST_MATH(x)						\
do {									\
   __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) );			\
} while (0)

#elif defined(__WATCOMC__) && defined(__386__)
#define DEFAULT_X86_FPU		0x037f /* See GCC comments above */
#define FAST_X86_FPU		0x003f /* See GCC comments above */
void _watcom_start_fast_math(unsigned short *x,unsigned short *mask);
#pragma aux _watcom_start_fast_math =                                   \
   "fnstcw  word ptr [eax]"                                             \
   "fldcw   word ptr [ecx]"                                             \
   parm [eax] [ecx]                                                     \
   modify exact [];
void _watcom_end_fast_math(unsigned short *x);
#pragma aux _watcom_end_fast_math =                                     \
   "fnclex"                                                             \
   "fldcw   word ptr [eax]"                                             \
   parm [eax]                                                           \
   modify exact [];
#if defined(NO_FAST_MATH)
#define START_FAST_MATH(x)                                              \
do {                                                                    \
   static GLushort mask = DEFAULT_X86_FPU;	                            \
   _watcom_start_fast_math(&x,&mask);                                   \
} while (0)
#else
#define START_FAST_MATH(x)                                              \
do {                                                                    \
   static GLushort mask = FAST_X86_FPU;                                 \
   _watcom_start_fast_math(&x,&mask);                                   \
} while (0)
#endif
#define END_FAST_MATH(x)  _watcom_end_fast_math(&x)
#else
#define START_FAST_MATH(x)  x = 0
#define END_FAST_MATH(x)  (void)(x)
#endif



/**********************************************************************
 * Functions
 */

extern void *
_mesa_malloc( size_t bytes );

extern void *
_mesa_calloc( size_t bytes );

extern void
_mesa_free( void *ptr );

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_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_memcpy( void *dest, const void *src, size_t n );

extern void
_mesa_memset( void *dst, int val, size_t n );

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

extern void
_mesa_bzero( void *dst, size_t n );


extern double
_mesa_sin(double a);

extern double
_mesa_cos(double a);

extern double
_mesa_sqrtd(double x);

extern float
_mesa_sqrtf(float x);

extern float
_mesa_inv_sqrtf(float x);

extern double
_mesa_pow(double x, double y);

extern float
_mesa_log2(float x);

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 char *
_mesa_getenv( const char *var );

extern char *
_mesa_strstr( const char *haystack, const char *needle );

extern char *
_mesa_strncat( char *dest, const char *src, size_t n );

extern char *
_mesa_strcpy( char *dest, const char *src );

extern char *
_mesa_strncpy( char *dest, const char *src, size_t n );

extern size_t
_mesa_strlen( const char *s );

extern int
_mesa_strcmp( const char *s1, const char *s2 );

extern int
_mesa_strncmp( const char *s1, const char *s2, size_t n );

extern char *
_mesa_strdup( const char *s );

extern int
_mesa_atoi( const char *s );

extern double
_mesa_strtod( const char *s, char **end );

extern int
_mesa_sprintf( char *str, const char *fmt, ... );

extern void
_mesa_printf( const char *fmtString, ... );


extern void
_mesa_warning( __GLcontext *gc, const char *fmtString, ... );

extern void
_mesa_problem( const __GLcontext *ctx, const char *fmtString, ... );

extern void
_mesa_error( __GLcontext *ctx, GLenum error, const char *fmtString, ... );

extern void
_mesa_debug( const __GLcontext *ctx, const char *fmtString, ... );


extern void
_mesa_init_default_imports( __GLimports *imports, void *driverCtx );


#ifdef __cplusplus
}
#endif


#endif /* IMPORTS_H */