/*
|
* Mesa 3-D graphics library
|
*
|
* 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
|
* 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.
|
*/
|
|
|
/**
|
* \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 <stdlib.h>
|
#include <stdarg.h>
|
#include <string.h>
|
#include "compiler.h"
|
#include "glheader.h"
|
#include "errors.h"
|
#include "util/bitscan.h"
|
|
#ifdef __cplusplus
|
extern "C" {
|
#endif
|
|
|
/**********************************************************************/
|
/** Memory macros */
|
/*@{*/
|
|
/** 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))
|
|
/*@}*/
|
|
|
/*
|
* 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 an 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; GLuint u; } fi_type;
|
|
|
|
#if defined(_MSC_VER)
|
#define strcasecmp(s1, s2) _stricmp(s1, s2)
|
#endif
|
/*@}*/
|
|
|
/***
|
*** LOG2: Log base 2 of float
|
***/
|
static inline GLfloat LOG2(GLfloat x)
|
{
|
#if 0
|
/* This is pretty fast, but not accurate enough (only 2 fractional bits).
|
* Based on code from http://www.stereopsis.com/log2.html
|
*/
|
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/
|
*/
|
fi_type num;
|
GLint log_2;
|
num.f = x;
|
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;
|
}
|
|
|
|
/**
|
* finite macro.
|
*/
|
#if defined(_MSC_VER)
|
# define finite _finite
|
#endif
|
|
|
/***
|
*** IS_INF_OR_NAN: test if float is infinite or NaN
|
***/
|
#if defined(isfinite)
|
#define IS_INF_OR_NAN(x) (!isfinite(x))
|
#elif defined(finite)
|
#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
|
|
|
/**
|
* Convert float to int by rounding to nearest integer, away from zero.
|
*/
|
static inline int IROUND(float f)
|
{
|
return (int) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
|
}
|
|
/**
|
* Convert double to int by rounding to nearest integer, away from zero.
|
*/
|
static inline int IROUNDD(double d)
|
{
|
return (int) ((d >= 0.0) ? (d + 0.5) : (d - 0.5));
|
}
|
|
/**
|
* Convert float to int64 by rounding to nearest integer.
|
*/
|
static inline GLint64 IROUND64(float f)
|
{
|
return (GLint64) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
|
}
|
|
|
/**
|
* Convert positive float to int by rounding to nearest integer.
|
*/
|
static inline int IROUND_POS(float f)
|
{
|
assert(f >= 0.0F);
|
return (int) (f + 0.5F);
|
}
|
|
/** Return (as an integer) floor of float */
|
static inline int IFLOOR(float f)
|
{
|
#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
|
*/
|
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;
|
#else
|
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;
|
#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)
|
{
|
#ifdef HAVE___BUILTIN_CLZ
|
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)
|
{
|
#ifdef HAVE___BUILTIN_CLZLL
|
uint64_t y = (x != 1);
|
STATIC_ASSERT(sizeof(x) == sizeof(long long));
|
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
|
}
|
|
|
/*
|
* Returns the floor form of binary logarithm for a 32-bit integer.
|
*/
|
static inline GLuint
|
_mesa_logbase2(GLuint n)
|
{
|
#ifdef HAVE___BUILTIN_CLZ
|
return (31 - __builtin_clz(n | 1));
|
#else
|
GLuint pos = 0;
|
if (n >= 1<<16) { n >>= 16; pos += 16; }
|
if (n >= 1<< 8) { n >>= 8; pos += 8; }
|
if (n >= 1<< 4) { n >>= 4; pos += 4; }
|
if (n >= 1<< 2) { n >>= 2; pos += 2; }
|
if (n >= 1<< 1) { pos += 1; }
|
return pos;
|
#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);
|
|
#ifdef HAVE___BUILTIN_POPCOUNT
|
#define _mesa_bitcount(i) __builtin_popcount(i)
|
#else
|
extern unsigned int
|
_mesa_bitcount(unsigned int n);
|
#endif
|
|
#ifdef HAVE___BUILTIN_POPCOUNTLL
|
#define _mesa_bitcount_64(i) __builtin_popcountll(i)
|
#else
|
extern unsigned int
|
_mesa_bitcount_64(uint64_t n);
|
#endif
|
|
|
extern int
|
_mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);
|
|
extern int
|
_mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list arg);
|
|
|
#if defined(_MSC_VER) && !defined(snprintf)
|
#define snprintf _snprintf
|
#endif
|
|
#if defined(_WIN32) && !defined(strtok_r)
|
#define strtok_r strtok_s
|
#endif
|
|
#ifdef __cplusplus
|
}
|
#endif
|
|
|
#endif /* IMPORTS_H */
|
