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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.
+ *
+ * The OpenGL SI's __GLimports structure allows per-context specification of
+ * replacements for the standard C lib functions. In practice that's probably
+ * never needed; compile-time replacements are far more likely.
+ *
+ * The _mesa_*() functions defined here don't in general take a context
+ * parameter. I guess we can change that someday, if need be.
+ * So for now, the __GLimports stuff really isn't used.
+ *
+ * \todo Functions still needed:
+ * - scanf
+ * - qsort
+ * - rand and RAND_MAX
+ *
+ * \note When compiled into a XFree86 module these functions wrap around
+ * XFree86 own wrappers.
+ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5
+ *
+ * Copyright (C) 1999-2006 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"
+
+
+#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
+
+/* If we don't actually want to use the libcwrapper junk (even though we're
+ * building an Xorg server module), then just undef IN_MODULE to signal that to
+ * the following code. It's left around for now to allow compiling of newish
+ * Mesa with older servers, but this whole mess should go away at some point.
+ */
+#ifdef NO_LIBCWRAPPER
+#undef IN_MODULE
+#endif
+
+/**********************************************************************/
+/** \name Memory */
+/*@{*/
+
+/** Wrapper around either malloc() or xf86malloc() */
+void *
+_mesa_malloc(size_t bytes)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86malloc(bytes);
+#else
+ return malloc(bytes);
+#endif
+}
+
+/** Wrapper around either calloc() or xf86calloc() */
+void *
+_mesa_calloc(size_t bytes)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86calloc(1, bytes);
+#else
+ return calloc(1, bytes);
+#endif
+}
+
+/** Wrapper around either free() or xf86free() */
+void
+_mesa_free(void *ptr)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86free(ptr);
+#else
+ free(ptr);
+#endif
+}
+
+/**
+ * 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) && !(defined(XFree86LOADER) && defined(IN_MODULE))
+ void *mem;
+
+ (void) posix_memalign(& mem, alignment, bytes);
+ return mem;
+#else
+ uintptr_t ptr, buf;
+
+ ASSERT( alignment > 0 );
+
+ ptr = (uintptr_t) _mesa_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) && !(defined(XFree86LOADER) && defined(IN_MODULE)) */
+}
+
+/**
+ * Same as _mesa_align_malloc(), but using _mesa_calloc() instead of
+ * _mesa_malloc()
+ */
+void *
+_mesa_align_calloc(size_t bytes, unsigned long alignment)
+{
+#if defined(HAVE_POSIX_MEMALIGN) && !(defined(XFree86LOADER) && defined(IN_MODULE))
+ void *mem;
+
+ mem = _mesa_align_malloc(bytes, alignment);
+ if (mem != NULL) {
+ (void) memset(mem, 0, bytes);
+ }
+
+ return mem;
+#else
+ uintptr_t ptr, buf;
+
+ ASSERT( alignment > 0 );
+
+ ptr = (uintptr_t) _mesa_calloc(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) && !(defined(XFree86LOADER) && defined(IN_MODULE)) */
+}
+
+/**
+ * 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) && !(defined(XFree86LOADER) && defined(IN_MODULE))
+ free(ptr);
+#else
+ void **cubbyHole = (void **) ((char *) ptr - sizeof(void *));
+ void *realAddr = *cubbyHole;
+ _mesa_free(realAddr);
+#endif /* defined(HAVE_POSIX_MEMALIGN) && !(defined(XFree86LOADER) && defined(IN_MODULE)) */
+}
+
+/**
+ * Reallocate memory, with alignment.
+ */
+void *
+_mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
+ unsigned long alignment)
+{
+ const size_t copySize = (oldSize < newSize) ? oldSize : newSize;
+ void *newBuf = _mesa_align_malloc(newSize, alignment);
+ if (newBuf && oldBuffer && copySize > 0) {
+ _mesa_memcpy(newBuf, oldBuffer, copySize);
+ }
+ if (oldBuffer)
+ _mesa_align_free(oldBuffer);
+ return newBuf;
+}
+
+
+
+/** Reallocate memory */
+void *
+_mesa_realloc(void *oldBuffer, size_t oldSize, size_t newSize)
+{
+ const size_t copySize = (oldSize < newSize) ? oldSize : newSize;
+ void *newBuffer = _mesa_malloc(newSize);
+ if (newBuffer && oldBuffer && copySize > 0)
+ _mesa_memcpy(newBuffer, oldBuffer, copySize);
+ if (oldBuffer)
+ _mesa_free(oldBuffer);
+ return newBuffer;
+}
+
+/** memcpy wrapper */
+void *
+_mesa_memcpy(void *dest, const void *src, size_t n)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86memcpy(dest, src, n);
+#elif defined(SUNOS4)
+ return memcpy((char *) dest, (char *) src, (int) n);
+#else
+ return memcpy(dest, src, n);
+#endif
+}
+
+/** Wrapper around either memset() or xf86memset() */
+void
+_mesa_memset( void *dst, int val, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86memset( dst, val, n );
+#elif defined(SUNOS4)
+ memset( (char *) dst, (int) val, (int) n );
+#else
+ memset(dst, val, n);
+#endif
+}
+
+/**
+ * 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;
+}
+
+/** Wrapper around either memcpy() or xf86memcpy() or bzero() */
+void
+_mesa_bzero( void *dst, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86memset( dst, 0, n );
+#elif defined(__FreeBSD__)
+ bzero( dst, n );
+#else
+ memset( dst, 0, n );
+#endif
+}
+
+/** Wrapper around either memcmp() or xf86memcmp() */
+int
+_mesa_memcmp( const void *s1, const void *s2, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86memcmp( s1, s2, n );
+#elif defined(SUNOS4)
+ return memcmp( (char *) s1, (char *) s2, (int) n );
+#else
+ return memcmp(s1, s2, n);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Math */
+/*@{*/
+
+/** Wrapper around either sin() or xf86sin() */
+double
+_mesa_sin(double a)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86sin(a);
+#else
+ return sin(a);
+#endif
+}
+
+/** Single precision wrapper around either sin() or xf86sin() */
+float
+_mesa_sinf(float a)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return (float) xf86sin((double) a);
+#else
+ return (float) sin((double) a);
+#endif
+}
+
+/** Wrapper around either cos() or xf86cos() */
+double
+_mesa_cos(double a)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86cos(a);
+#else
+ return cos(a);
+#endif
+}
+
+/** Single precision wrapper around either asin() or xf86asin() */
+float
+_mesa_asinf(float x)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return (float) xf86asin((double) x);
+#else
+ return (float) asin((double) x);
+#endif
+}
+
+/** Single precision wrapper around either atan() or xf86atan() */
+float
+_mesa_atanf(float x)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return (float) xf86atan((double) x);
+#else
+ return (float) atan((double) x);
+#endif
+}
+
+/** Wrapper around either sqrt() or xf86sqrt() */
+double
+_mesa_sqrtd(double x)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86sqrt(x);
+#else
+ return sqrt(x);
+#endif
+}
+
+
+/*
+ * 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 */
+
+static void 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
+ union { float f; unsigned int i; } 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
+#elif defined(XFree86LOADER) && defined(IN_MODULE)
+ return 1.0F / xf86sqrt(n);
+#else
+ return (float) (1.0 / sqrt(n));
+#endif
+}
+
+
+/**
+ * Wrapper around either pow() or xf86pow().
+ */
+double
+_mesa_pow(double x, double y)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86pow(x, y);
+#else
+ return pow(x, y);
+#endif
+}
+
+
+/**
+ * Find the first bit set in a word.
+ */
+int
+_mesa_ffs(int i)
+{
+#if (defined(_WIN32) && !defined(__MINGW32__) ) || 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;
+ }
+ }
+ return bit;
+#elif defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86ffs(i);
+#else
+ return ffs(i);
+#endif
+}
+
+
+/**
+ * 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;
+}
+
+
+/**
+ * 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 int flt = *((int *) (void *) &val);
+ const int flt_m = flt & 0x7fffff;
+ const int flt_e = (flt >> 23) & 0xff;
+ const int flt_s = (flt >> 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, flt;
+ 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;
+ }
+
+ flt = (flt_s << 31) | (flt_e << 23) | flt_m;
+ result = *((float *) (void *) &flt);
+ 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(XFree86LOADER) && defined(IN_MODULE)
+ return xf86bsearch(key, base, nmemb, size, compar);
+#else
+ return bsearch(key, base, nmemb, size, compar);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Environment vars */
+/*@{*/
+
+/**
+ * Wrapper for getenv().
+ */
+char *
+_mesa_getenv( const char *var )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86getenv(var);
+#elif defined(_XBOX)
+ return NULL;
+#else
+ return getenv(var);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name String */
+/*@{*/
+
+/** Wrapper around either strstr() or xf86strstr() */
+char *
+_mesa_strstr( const char *haystack, const char *needle )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strstr(haystack, needle);
+#else
+ return strstr(haystack, needle);
+#endif
+}
+
+/** Wrapper around either strncat() or xf86strncat() */
+char *
+_mesa_strncat( char *dest, const char *src, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strncat(dest, src, n);
+#else
+ return strncat(dest, src, n);
+#endif
+}
+
+/** Wrapper around either strcpy() or xf86strcpy() */
+char *
+_mesa_strcpy( char *dest, const char *src )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strcpy(dest, src);
+#else
+ return strcpy(dest, src);
+#endif
+}
+
+/** Wrapper around either strncpy() or xf86strncpy() */
+char *
+_mesa_strncpy( char *dest, const char *src, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strncpy(dest, src, n);
+#else
+ return strncpy(dest, src, n);
+#endif
+}
+
+/** Wrapper around either strlen() or xf86strlen() */
+size_t
+_mesa_strlen( const char *s )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strlen(s);
+#else
+ return strlen(s);
+#endif
+}
+
+/** Wrapper around either strcmp() or xf86strcmp() */
+int
+_mesa_strcmp( const char *s1, const char *s2 )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strcmp(s1, s2);
+#else
+ return strcmp(s1, s2);
+#endif
+}
+
+/** Wrapper around either strncmp() or xf86strncmp() */
+int
+_mesa_strncmp( const char *s1, const char *s2, size_t n )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strncmp(s1, s2, n);
+#else
+ return strncmp(s1, s2, n);
+#endif
+}
+
+/** Implemented using _mesa_malloc() and _mesa_strcpy */
+char *
+_mesa_strdup( const char *s )
+{
+ size_t l = _mesa_strlen(s);
+ char *s2 = (char *) _mesa_malloc(l + 1);
+ if (s2)
+ _mesa_strcpy(s2, s);
+ return s2;
+}
+
+/** Wrapper around either atoi() or xf86atoi() */
+int
+_mesa_atoi(const char *s)
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86atoi(s);
+#else
+ return atoi(s);
+#endif
+}
+
+/** Wrapper around either strtod() or xf86strtod() */
+double
+_mesa_strtod( const char *s, char **end )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86strtod(s, end);
+#else
+ return strtod(s, end);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name I/O */
+/*@{*/
+
+/** Wrapper around either vsprintf() or xf86vsprintf() */
+int
+_mesa_sprintf( char *str, const char *fmt, ... )
+{
+ int r;
+ va_list args;
+ va_start( args, fmt );
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ r = xf86vsprintf( str, fmt, args );
+#else
+ r = vsprintf( str, fmt, args );
+#endif
+ va_end( args );
+ return r;
+}
+
+/** Wrapper around either printf() or xf86printf(), using vsprintf() for
+ * the formatting. */
+void
+_mesa_printf( const char *fmtString, ... )
+{
+ char s[MAXSTRING];
+ va_list args;
+ va_start( args, fmtString );
+ vsnprintf(s, MAXSTRING, fmtString, args);
+ va_end( args );
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86printf("%s", s);
+#else
+ fprintf(stderr,"%s", s);
+#endif
+}
+
+/** Wrapper around either vsprintf() or xf86vsprintf() */
+int
+_mesa_vsprintf( char *str, const char *fmt, va_list args )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86vsprintf( str, fmt, args );
+#else
+ return vsprintf( str, fmt, args );
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Diagnostics */
+/*@{*/
+
+/**
+ * Display a warning.
+ *
+ * \param ctx GL context.
+ * \param fmtString printf() alike format string.
+ *
+ * If debugging is enabled (either at compile-time via the DEBUG macro, or
+ * run-time via the MESA_DEBUG environment variable), prints the warning to
+ * stderr, either via fprintf() or xf86printf().
+ */
+void
+_mesa_warning( GLcontext *ctx, const char *fmtString, ... )
+{
+ GLboolean debug;
+ char str[MAXSTRING];
+ va_list args;
+ (void) ctx;
+ va_start( args, fmtString );
+ (void) vsnprintf( str, MAXSTRING, fmtString, args );
+ va_end( args );
+#ifdef DEBUG
+ debug = GL_TRUE; /* always print warning */
+#else
+ debug = _mesa_getenv("MESA_DEBUG") ? GL_TRUE : GL_FALSE;
+#endif
+ if (debug) {
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86fprintf(stderr, "Mesa warning: %s\n", str);
+#else
+ fprintf(stderr, "Mesa warning: %s\n", str);
+#endif
+ }
+}
+
+/**
+ * This function is called when the Mesa user has stumbled into a code
+ * path which may not be implemented fully or correctly.
+ *
+ * \param ctx GL context.
+ * \param s problem description string.
+ *
+ * Prints the message to stderr, either via fprintf() or xf86fprintf().
+ */
+void
+_mesa_problem( const GLcontext *ctx, const char *fmtString, ... )
+{
+ va_list args;
+ char str[MAXSTRING];
+ (void) ctx;
+
+ va_start( args, fmtString );
+ vsnprintf( str, MAXSTRING, fmtString, args );
+ va_end( args );
+
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86fprintf(stderr, "Mesa %s implementation error: %s\n", MESA_VERSION_STRING, str);
+ xf86fprintf(stderr, "Please report at bugzilla.freedesktop.org\n");
+#else
+ fprintf(stderr, "Mesa %s implementation error: %s\n", MESA_VERSION_STRING, str);
+ fprintf(stderr, "Please report at bugzilla.freedesktop.org\n");
+#endif
+}
+
+/**
+ * Display an error message.
+ *
+ * If in debug mode, print error message.
+ * Also, record the error code by calling _mesa_record_error().
+ *
+ * \param ctx the GL context.
+ * \param error the error value.
+ * \param fmtString printf() style format string, followed by optional args
+ *
+ * If debugging is enabled (either at compile-time via the DEBUG macro, or
+ * run-time via the MESA_DEBUG environment variable), interperts the error code and
+ * prints the error message via _mesa_debug().
+ */
+void
+_mesa_error( GLcontext *ctx, GLenum error, const char *fmtString, ... )
+{
+ const char *debugEnv;
+ GLboolean debug;
+
+ debugEnv = _mesa_getenv("MESA_DEBUG");
+
+#ifdef DEBUG
+ if (debugEnv && _mesa_strstr(debugEnv, "silent"))
+ debug = GL_FALSE;
+ else
+ debug = GL_TRUE;
+#else
+ if (debugEnv)
+ debug = GL_TRUE;
+ else
+ debug = GL_FALSE;
+#endif
+
+ if (debug) {
+ va_list args;
+ char where[MAXSTRING];
+ const char *errstr;
+
+ va_start( args, fmtString );
+ vsnprintf( where, MAXSTRING, fmtString, args );
+ va_end( args );
+
+ switch (error) {
+ case GL_NO_ERROR:
+ errstr = "GL_NO_ERROR";
+ break;
+ case GL_INVALID_VALUE:
+ errstr = "GL_INVALID_VALUE";
+ break;
+ case GL_INVALID_ENUM:
+ errstr = "GL_INVALID_ENUM";
+ break;
+ case GL_INVALID_OPERATION:
+ errstr = "GL_INVALID_OPERATION";
+ break;
+ case GL_STACK_OVERFLOW:
+ errstr = "GL_STACK_OVERFLOW";
+ break;
+ case GL_STACK_UNDERFLOW:
+ errstr = "GL_STACK_UNDERFLOW";
+ break;
+ case GL_OUT_OF_MEMORY:
+ errstr = "GL_OUT_OF_MEMORY";
+ break;
+ case GL_TABLE_TOO_LARGE:
+ errstr = "GL_TABLE_TOO_LARGE";
+ break;
+ case GL_INVALID_FRAMEBUFFER_OPERATION_EXT:
+ errstr = "GL_INVALID_FRAMEBUFFER_OPERATION";
+ break;
+ default:
+ errstr = "unknown";
+ break;
+ }
+ _mesa_debug(ctx, "User error: %s in %s\n", errstr, where);
+ }
+
+ _mesa_record_error(ctx, error);
+}
+
+/**
+ * Report debug information.
+ *
+ * \param ctx GL context.
+ * \param fmtString printf() alike format string.
+ *
+ * Prints the message to stderr, either via fprintf() or xf86printf().
+ */
+void
+_mesa_debug( const GLcontext *ctx, const char *fmtString, ... )
+{
+ char s[MAXSTRING];
+ va_list args;
+ (void) ctx;
+ va_start(args, fmtString);
+ vsnprintf(s, MAXSTRING, fmtString, args);
+ va_end(args);
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86fprintf(stderr, "Mesa: %s", s);
+#else
+ fprintf(stderr, "Mesa: %s", s);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Exit */
+/*@{*/
+
+/**
+ * Wrapper for exit().
+ */
+void
+_mesa_exit( int status )
+{
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ xf86exit(status);
+#else
+ exit(status);
+#endif
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Default Imports Wrapper */
+/*@{*/
+
+/** Wrapper around _mesa_malloc() */
+static void *
+default_malloc(__GLcontext *gc, size_t size)
+{
+ (void) gc;
+ return _mesa_malloc(size);
+}
+
+/** Wrapper around _mesa_malloc() */
+static void *
+default_calloc(__GLcontext *gc, size_t numElem, size_t elemSize)
+{
+ (void) gc;
+ return _mesa_calloc(numElem * elemSize);
+}
+
+/** Wrapper around either realloc() or xf86realloc() */
+static void *
+default_realloc(__GLcontext *gc, void *oldAddr, size_t newSize)
+{
+ (void) gc;
+#if defined(XFree86LOADER) && defined(IN_MODULE)
+ return xf86realloc(oldAddr, newSize);
+#else
+ return realloc(oldAddr, newSize);
+#endif
+}
+
+/** Wrapper around _mesa_free() */
+static void
+default_free(__GLcontext *gc, void *addr)
+{
+ (void) gc;
+ _mesa_free(addr);
+}
+
+/** Wrapper around _mesa_getenv() */
+static char * CAPI
+default_getenv( __GLcontext *gc, const char *var )
+{
+ (void) gc;
+ return _mesa_getenv(var);
+}
+
+/** Wrapper around _mesa_warning() */
+static void
+default_warning(__GLcontext *gc, char *str)
+{
+ _mesa_warning(gc, str);
+}
+
+/** Wrapper around _mesa_problem() */
+static void
+default_fatal(__GLcontext *gc, char *str)
+{
+ _mesa_problem(gc, str);
+ abort();
+}
+
+/** Wrapper around atoi() */
+static int CAPI
+default_atoi(__GLcontext *gc, const char *str)
+{
+ (void) gc;
+ return atoi(str);
+}
+
+/** Wrapper around vsprintf() */
+static int CAPI
+default_sprintf(__GLcontext *gc, char *str, const char *fmt, ...)
+{
+ int r;
+ va_list args;
+ (void) gc;
+ va_start( args, fmt );
+ r = vsprintf( str, fmt, args );
+ va_end( args );
+ return r;
+}
+
+/** Wrapper around fopen() */
+static void * CAPI
+default_fopen(__GLcontext *gc, const char *path, const char *mode)
+{
+ (void) gc;
+ return fopen(path, mode);
+}
+
+/** Wrapper around fclose() */
+static int CAPI
+default_fclose(__GLcontext *gc, void *stream)
+{
+ (void) gc;
+ return fclose((FILE *) stream);
+}
+
+/** Wrapper around vfprintf() */
+static int CAPI
+default_fprintf(__GLcontext *gc, void *stream, const char *fmt, ...)
+{
+ int r;
+ va_list args;
+ (void) gc;
+ va_start( args, fmt );
+ r = vfprintf( (FILE *) stream, fmt, args );
+ va_end( args );
+ return r;
+}
+
+/**
+ * \todo this really is driver-specific and can't be here
+ */
+static __GLdrawablePrivate *
+default_GetDrawablePrivate(__GLcontext *gc)
+{
+ (void) gc;
+ return NULL;
+}
+
+/*@}*/
+
+
+/**
+ * Initialize a __GLimports object to point to the functions in this
+ * file.
+ *
+ * This is to be called from device drivers.
+ *
+ * Also, do some one-time initializations.
+ *
+ * \param imports the object to initialize.
+ * \param driverCtx pointer to device driver-specific data.
+ */
+void
+_mesa_init_default_imports(__GLimports *imports, void *driverCtx)
+{
+ /* XXX maybe move this one-time init stuff into context.c */
+ static GLboolean initialized = GL_FALSE;
+ if (!initialized) {
+ init_sqrt_table();
+ initialized = GL_TRUE;
+ }
+
+ imports->malloc = default_malloc;
+ imports->calloc = default_calloc;
+ imports->realloc = default_realloc;
+ imports->free = default_free;
+ imports->warning = default_warning;
+ imports->fatal = default_fatal;
+ imports->getenv = default_getenv; /* not used for now */
+ imports->atoi = default_atoi;
+ imports->sprintf = default_sprintf;
+ imports->fopen = default_fopen;
+ imports->fclose = default_fclose;
+ imports->fprintf = default_fprintf;
+ imports->getDrawablePrivate = default_GetDrawablePrivate;
+ imports->other = driverCtx;
+}