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reactos/dll/opengl/mesa/main/imports.c

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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 <precomp.h>
#ifdef _GNU_SOURCE
#include <locale.h>
#ifdef __APPLE__
#include <xlocale.h>
#endif
#endif
#define MAXSTRING 4000 /* for vsnprintf() */
#ifdef WIN32
#define vsnprintf _vsnprintf
#elif defined(__IBMC__) || defined(__IBMCPP__) || ( defined(__VMS) && __CRTL_VER < 70312000 )
extern int vsnprintf(char *str, size_t count, const char *fmt, va_list arg);
#ifdef __VMS
#include "vsnprintf.c"
#endif
#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);
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
}
#ifndef __GNUC__
/**
* 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 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)
{
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
#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
/*@}*/
/**********************************************************************/
/** \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__) && \
!defined(ANDROID) && !defined(__HAIKU__)
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];
static int numCalls = 0;
(void) ctx;
if (numCalls < 50) {
numCalls++;
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;
}
/*@}*/
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