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Diffstat (limited to 'src/game/bg_lib.c')
| -rw-r--r-- | src/game/bg_lib.c | 2045 |
1 files changed, 2045 insertions, 0 deletions
diff --git a/src/game/bg_lib.c b/src/game/bg_lib.c new file mode 100644 index 0000000..69bca48 --- /dev/null +++ b/src/game/bg_lib.c @@ -0,0 +1,2045 @@ +/* +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. +Copyright (C) 2000-2006 Tim Angus + +This file is part of Tremulous. + +Tremulous is free software; you can redistribute it +and/or modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the License, +or (at your option) any later version. + +Tremulous is distributed in the hope that it will be +useful, but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with Tremulous; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +=========================================================================== +*/ + +// bg_lib.c -- standard C library replacement routines used by code +// compiled for the virtual machine + + +#include "../qcommon/q_shared.h" + +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "bg_lib.h" + +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)qsort.c 8.1 (Berkeley) 6/4/93"; +#endif +static const char rcsid[] = + "$Id: bg_lib.c 965 2007-08-09 13:54:12Z msk $"; +#endif /* LIBC_SCCS and not lint */ + +// bk001127 - needed for DLL's +#if !defined( Q3_VM ) +typedef int cmp_t(const void *, const void *); +#endif + +static char* med3(char *, char *, char *, cmp_t *); +static void swapfunc(char *, char *, int, int); + +#ifndef min +#define min(a, b) (a) < (b) ? a : b +#endif + +/* + * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function". + */ +#define swapcode(TYPE, parmi, parmj, n) { \ + long i = (n) / sizeof (TYPE); \ + register TYPE *pi = (TYPE *) (parmi); \ + register TYPE *pj = (TYPE *) (parmj); \ + do { \ + register TYPE t = *pi; \ + *pi++ = *pj; \ + *pj++ = t; \ + } while (--i > 0); \ +} + +#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \ + es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1; + +static void +swapfunc(a, b, n, swaptype) + char *a, *b; + int n, swaptype; +{ + if(swaptype <= 1) + swapcode(long, a, b, n) + else + swapcode(char, a, b, n) +} + +#define swap(a, b) \ + if (swaptype == 0) { \ + long t = *(long *)(a); \ + *(long *)(a) = *(long *)(b); \ + *(long *)(b) = t; \ + } else \ + swapfunc(a, b, es, swaptype) + +#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype) + +static char * +med3(a, b, c, cmp) + char *a, *b, *c; + cmp_t *cmp; +{ + return cmp(a, b) < 0 ? + (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a )) + :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c )); +} + +void +qsort(a, n, es, cmp) + void *a; + size_t n, es; + cmp_t *cmp; +{ + char *pa, *pb, *pc, *pd, *pl, *pm, *pn; + int d, r, swaptype, swap_cnt; + +loop: SWAPINIT(a, es); + swap_cnt = 0; + if (n < 7) { + for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es) + for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0; + pl -= es) + swap(pl, pl - es); + return; + } + pm = (char *)a + (n / 2) * es; + if (n > 7) { + pl = a; + pn = (char *)a + (n - 1) * es; + if (n > 40) { + d = (n / 8) * es; + pl = med3(pl, pl + d, pl + 2 * d, cmp); + pm = med3(pm - d, pm, pm + d, cmp); + pn = med3(pn - 2 * d, pn - d, pn, cmp); + } + pm = med3(pl, pm, pn, cmp); + } + swap(a, pm); + pa = pb = (char *)a + es; + + pc = pd = (char *)a + (n - 1) * es; + for (;;) { + while (pb <= pc && (r = cmp(pb, a)) <= 0) { + if (r == 0) { + swap_cnt = 1; + swap(pa, pb); + pa += es; + } + pb += es; + } + while (pb <= pc && (r = cmp(pc, a)) >= 0) { + if (r == 0) { + swap_cnt = 1; + swap(pc, pd); + pd -= es; + } + pc -= es; + } + if (pb > pc) + break; + swap(pb, pc); + swap_cnt = 1; + pb += es; + pc -= es; + } + if (swap_cnt == 0) { /* Switch to insertion sort */ + for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es) + for (pl = pm; pl > (char *)a && cmp(pl - es, pl) > 0; + pl -= es) + swap(pl, pl - es); + return; + } + + pn = (char *)a + n * es; + r = min(pa - (char *)a, pb - pa); + vecswap(a, pb - r, r); + r = min(pd - pc, pn - pd - es); + vecswap(pb, pn - r, r); + if ((r = pb - pa) > es) + qsort(a, r / es, es, cmp); + if ((r = pd - pc) > es) { + /* Iterate rather than recurse to save stack space */ + a = pn - r; + n = r / es; + goto loop; + } +/* qsort(pn - r, r / es, es, cmp);*/ +} + +//================================================================================== + + +// this file is excluded from release builds because of intrinsics + +// bk001211 - gcc errors on compiling strcpy: parse error before `__extension__' +#if defined ( Q3_VM ) + +size_t strlen( const char *string ) +{ + const char *s; + + s = string; + while( *s ) + s++; + + return s - string; +} + + +char *strcat( char *strDestination, const char *strSource ) +{ + char *s; + + s = strDestination; + while( *s ) + s++; + + while( *strSource ) + *s++ = *strSource++; + + *s = 0; + return strDestination; +} + +char *strcpy( char *strDestination, const char *strSource ) +{ + char *s; + + s = strDestination; + + while( *strSource ) + *s++ = *strSource++; + + *s = 0; + return strDestination; +} + + +int strcmp( const char *string1, const char *string2 ) +{ + while( *string1 == *string2 && *string1 && *string2 ) + { + string1++; + string2++; + } + + return *string1 - *string2; +} + +//TA: +char *strrchr( const char *string, int c ) +{ + int i, length = strlen( string ); + char *p; + + for( i = length - 1; i >= 0; i-- ) + { + p = (char *)&string[ i ]; + + if( *p == c ) + return (char *)p; + } + + return (char *)0; +} + +char *strchr( const char *string, int c ) +{ + while( *string ) + { + if( *string == c ) + return ( char * )string; + + string++; + } + return (char *)0; +} + +char *strstr( const char *string, const char *strCharSet ) +{ + while( *string ) + { + int i; + + for( i = 0; strCharSet[ i ]; i++ ) + { + if( string[ i ] != strCharSet[ i ] ) + break; + } + + if( !strCharSet[ i ] ) + return (char *)string; + + string++; + } + return (char *)0; +} + +#endif // bk001211 + +#if defined ( Q3_VM ) + +int tolower( int c ) +{ + if( c >= 'A' && c <= 'Z' ) + c += 'a' - 'A'; + + return c; +} + + +int toupper( int c ) +{ + if( c >= 'a' && c <= 'z' ) + c += 'A' - 'a'; + + return c; +} + +#endif + +void *memmove( void *dest, const void *src, size_t count ) +{ + int i; + + if( dest > src ) + { + for( i = count - 1; i >= 0; i-- ) + ( (char *)dest )[ i ] = ( (char *)src )[ i ]; + } + else + { + for( i = 0; i < count; i++ ) + ( (char *)dest )[ i ] = ( (char *)src )[ i ]; + } + + return dest; +} + + +#if 0 + +double floor( double x ) { + return (int)(x + 0x40000000) - 0x40000000; +} + +void *memset( void *dest, int c, size_t count ) { + while ( count-- ) { + ((char *)dest)[count] = c; + } + return dest; +} + +void *memcpy( void *dest, const void *src, size_t count ) { + while ( count-- ) { + ((char *)dest)[count] = ((char *)src)[count]; + } + return dest; +} + +char *strncpy( char *strDest, const char *strSource, size_t count ) { + char *s; + + s = strDest; + while ( *strSource && count ) { + *s++ = *strSource++; + count--; + } + while ( count-- ) { + *s++ = 0; + } + return strDest; +} + +double sqrt( double x ) { + float y; + float delta; + float maxError; + + if ( x <= 0 ) { + return 0; + } + + // initial guess + y = x / 2; + + // refine + maxError = x * 0.001; + + do { + delta = ( y * y ) - x; + y -= delta / ( 2 * y ); + } while ( delta > maxError || delta < -maxError ); + + return y; +} + + +float sintable[1024] = { 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sintable[index]; + case 1: + return sintable[1023-index]; + case 2: + return -sintable[index]; + case 3: + return -sintable[1023-index]; + } + return 0; +} + + +double cos( double x ) { + int index; + int quad; + + index = 1024 * x / (M_PI * 0.5); + quad = ( index >> 10 ) & 3; + index &= 1023; + switch ( quad ) { + case 3: + return sintable[index]; + case 0: + return sintable[1023-index]; + case 1: + return -sintable[index]; + case 2: + return -sintable[1023-index]; + } + return 0; +} + + +/* +void create_acostable( void ) { + int i; + FILE *fp; + float a; + + fp = fopen("c:\\acostable.txt", "w"); + fprintf(fp, "float acostable[] = {"); + for (i = 0; i < 1024; i++) { + if (!(i & 7)) + fprintf(fp, "\n"); + a = acos( (float) -1 + i / 512 ); + fprintf(fp, "%1.8f,", a); + } + fprintf(fp, "\n}\n"); + fclose(fp); +} +*/ + + +float acostable[] = { +3.14159265,3.07908248,3.05317551,3.03328655,3.01651113,3.00172442,2.98834964,2.97604422, 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+0.43646903,0.43182577,0.42713525,0.42239588,0.41760600,0.41276385,0.40786755,0.40291513, +0.39790449,0.39283339,0.38769946,0.38250016,0.37723277,0.37189441,0.36648196,0.36099209, +0.35542120,0.34976542,0.34402054,0.33818204,0.33224495,0.32620390,0.32005298,0.31378574, +0.30739505,0.30087304,0.29421096,0.28739907,0.28042645,0.27328078,0.26594810,0.25841250, +0.25065566,0.24265636,0.23438976,0.22582651,0.21693146,0.20766198,0.19796546,0.18777575, +0.17700769,0.16554844,0.15324301,0.13986823,0.12508152,0.10830610,0.08841715,0.06251018, +}; + +double acos( double x ) { + int index; + + if (x < -1) + x = -1; + if (x > 1) + x = 1; + index = (float) (1.0 + x) * 511.9; + return acostable[index]; +} + + +double atan2( double y, double x ) { + float base; + float temp; + float dir; + float test; + int i; + + if ( x < 0 ) { + if ( y >= 0 ) { + // quad 1 + base = M_PI / 2; + temp = x; + x = y; + y = -temp; + } else { + // quad 2 + base = M_PI; + x = -x; + y = -y; + } + } else { + if ( y < 0 ) { + // quad 3 + base = 3 * M_PI / 2; + temp = x; + x = -y; + y = temp; + } + } + + if ( y > x ) { + base += M_PI/2; + temp = x; + x = y; + y = temp; + dir = -1; + } else { + dir = 1; + } + + // calcualte angle in octant 0 + if ( x == 0 ) { + return base; + } + y /= x; + + for ( i = 0 ; i < 512 ; i++ ) { + test = sintable[i] / sintable[1023-i]; + if ( test > y ) { + break; + } + } + + return base + dir * i * ( M_PI/2048); +} + + +#endif + +#ifdef Q3_VM +/* +=============== +rint +=============== +*/ +double rint( double v ) +{ + if( v >= 0.5f ) + return ceil( v ); + else + return floor( v ); +} + +// bk001127 - guarded this tan replacement +// ld: undefined versioned symbol name tan@@GLIBC_2.0 +double tan( double x ) +{ + return sin( x ) / cos( x ); +} + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +typedef union +{ + float value; + unsigned int word; +} ieee_float_shape_type; + +/* Get a 32 bit int from a float. */ + +#define GET_FLOAT_WORD(i,d) \ +do { \ + ieee_float_shape_type gf_u; \ + gf_u.value = (d); \ + (i) = gf_u.word; \ +} while (0) + +/* Set a float from a 32 bit int. */ + +#define SET_FLOAT_WORD(d,i) \ +do { \ + ieee_float_shape_type sf_u; \ + sf_u.word = (i); \ + (d) = sf_u.value; \ +} while (0) + +/* A union which permits us to convert between a float and a 32 bit + int. */ + +//acos +static const float +pi = 3.1415925026e+00, /* 0x40490fda */ +pio2_hi = 1.5707962513e+00, /* 0x3fc90fda */ +pio2_lo = 7.5497894159e-08, /* 0x33a22168 */ +pS0 = 1.6666667163e-01, /* 0x3e2aaaab */ +pS1 = -3.2556581497e-01, /* 0xbea6b090 */ +pS2 = 2.0121252537e-01, /* 0x3e4e0aa8 */ +pS3 = -4.0055535734e-02, /* 0xbd241146 */ +pS4 = 7.9153501429e-04, /* 0x3a4f7f04 */ +pS5 = 3.4793309169e-05, /* 0x3811ef08 */ +qS1 = -2.4033949375e+00, /* 0xc019d139 */ +qS2 = 2.0209457874e+00, /* 0x4001572d */ +qS3 = -6.8828397989e-01, /* 0xbf303361 */ +qS4 = 7.7038154006e-02; /* 0x3d9dc62e */ + +/* +================== +acos +================== +*/ +double acos( double x ) +{ + float z, subp, p, q, r, w, s, c, df; + int hx, ix; + + GET_FLOAT_WORD( hx, x ); + ix = hx & 0x7fffffff; + + if( ix == 0x3f800000 ) + { // |x|==1 + if( hx > 0 ) + return 0.0; // acos(1) = 0 + else + return pi + (float)2.0 * pio2_lo; // acos(-1)= pi + } + else if( ix > 0x3f800000 ) + { // |x| >= 1 + return (x-x)/(x-x); // acos(|x|>1) is NaN + } + + if( ix < 0x3f000000 ) + { // |x| < 0.5 + if( ix <= 0x23000000 ) + return pio2_hi + pio2_lo;//if|x|<2**-57 + + z = x * x; + subp = pS3 + z * ( pS4 + z * pS5 ); + // chop up expression to keep mac register based stack happy + p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) ); + q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) ); + r = p / q; + return pio2_hi - ( x - ( pio2_lo - x * r ) ); + } + else if( hx < 0 ) + { // x < -0.5 + z = ( 1.0 + x ) * (float)0.5; + subp = pS3 + z * ( pS4 + z * pS5 ); + // chop up expression to keep mac register based stack happy + p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) ); + q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) ); + s = sqrt( z ); + r = p / q; + w = r * s - pio2_lo; + return pi - (float)2.0 * ( s + w ); + } + else + { // x > 0.5 + int idf; + z = ( 1.0 - x ) * (float)0.5; + s = sqrt( z ); + df = s; + GET_FLOAT_WORD( idf, df ); + SET_FLOAT_WORD( df, idf & 0xfffff000 ); + c = ( z - df * df ) / ( s + df ); + subp = pS3 + z * ( pS4 + z * pS5 ); + // chop up expression to keep mac register based stack happy + p = z * ( pS0 + z * ( pS1 + z * ( pS2 + z * subp ) ) ); + q = 1.0 + z * ( qS1 + z * ( qS2 + z * ( qS3 + z * qS4 ) ) ); + r = p / q; + w = r * s + c; + return (double)( 2.0 * ( df + w ) ); + } +} + +//pow +static const float +bp[ ] = { 1.0, 1.5, }, +dp_h[ ] = { 0.0, 5.84960938e-01, }, /* 0x3f15c000 */ +dp_l[ ] = { 0.0, 1.56322085e-06, }, /* 0x35d1cfdc */ +huge = 1.0e+30, +tiny = 1.0e-30, +zero = 0.0, +one = 1.0, +two = 2.0, +two24 = 16777216.0, /* 0x4b800000 */ +two25 = 3.355443200e+07, /* 0x4c000000 */ +twom25 = 2.9802322388e-08, /* 0x33000000 */ + /* poly coefs for (3/2)*(log(x)-2s-2/3*s**3 */ +L1 = 6.0000002384e-01, /* 0x3f19999a */ +L2 = 4.2857143283e-01, /* 0x3edb6db7 */ +L3 = 3.3333334327e-01, /* 0x3eaaaaab */ +L4 = 2.7272811532e-01, /* 0x3e8ba305 */ +L5 = 2.3066075146e-01, /* 0x3e6c3255 */ +L6 = 2.0697501302e-01, /* 0x3e53f142 */ +P1 = 1.6666667163e-01, /* 0x3e2aaaab */ +P2 = -2.7777778450e-03, /* 0xbb360b61 */ +P3 = 6.6137559770e-05, /* 0x388ab355 */ +P4 = -1.6533901999e-06, /* 0xb5ddea0e */ +P5 = 4.1381369442e-08, /* 0x3331bb4c */ +lg2 = 6.9314718246e-01, /* 0x3f317218 */ +lg2_h = 6.93145752e-01, /* 0x3f317200 */ +lg2_l = 1.42860654e-06, /* 0x35bfbe8c */ +ovt = 4.2995665694e-08, /* -(128-log2(ovfl+.5ulp)) */ +cp = 9.6179670095e-01, /* 0x3f76384f =2/(3ln2) */ +cp_h = 9.6179199219e-01, /* 0x3f763800 =head of cp */ +cp_l = 4.7017383622e-06, /* 0x369dc3a0 =tail of cp_h */ +ivln2 = 1.4426950216e+00, /* 0x3fb8aa3b =1/ln2 */ +ivln2_h = 1.4426879883e+00, /* 0x3fb8aa00 =16b 1/ln2*/ +ivln2_l = 7.0526075433e-06; /* 0x36eca570 =1/ln2 tail*/ + +/* +================== +copysignf +================== +*/ +static float copysignf( float x, float y ) +{ + unsigned int ix, iy; + + GET_FLOAT_WORD( ix, x ); + GET_FLOAT_WORD( iy, y ); + SET_FLOAT_WORD( x, ( ix & 0x7fffffff ) | ( iy & 0x80000000 ) ); + return x; +} + +/* +================== +__scalbnf +================== +*/ +static float __scalbnf( float x, int n ) +{ + int k, ix; + + GET_FLOAT_WORD( ix, x ); + + k = ( ix & 0x7f800000 ) >> 23; /* extract exponent */ + + if( k == 0 ) + { /* 0 or subnormal x */ + if( ( ix & 0x7fffffff ) == 0 ) + return x; /* +-0 */ + + x *= two25; + GET_FLOAT_WORD( ix, x ); + k = ( ( ix & 0x7f800000 ) >> 23 ) - 25; + } + if( k == 0xff ) + return x+x; /* NaN or Inf */ + + k = k + n; + + if( n > 50000 || k > 0xfe ) + return huge * copysignf( huge, x ); /* overflow */ + if ( n < -50000 ) + return tiny * copysignf( tiny, x ); /*underflow*/ + if( k > 0 ) /* normal result */ + { + SET_FLOAT_WORD( x, ( ix & 0x807fffff ) | ( k << 23 ) ); + return x; + } + if( k <= -25 ) + return tiny * copysignf( tiny, x ); /*underflow*/ + + k += 25; /* subnormal result */ + SET_FLOAT_WORD( x, ( ix & 0x807fffff ) | ( k << 23 ) ); + return x * twom25; +} + +/* +================== +pow +================== +*/ +float pow( float x, float y ) +{ + float z, ax, z_h, z_l, p_h, p_l; + float y1, subt1, t1, t2, subr, r, s, t, u, v, w; + int i, j, k, yisint, n; + int hx, hy, ix, iy, is; + + /*TA: for some reason the Q3 VM goes apeshit when x = 1.0 + and y > 1.0. Curiously this doesn't happen with gcc + hence this hack*/ + if( x == 1.0 ) + return x; + + GET_FLOAT_WORD( hx, x ); + GET_FLOAT_WORD( hy, y ); + ix = hx & 0x7fffffff; + iy = hy & 0x7fffffff; + + /* y==zero: x**0 = 1 */ + if( iy == 0 ) + return one; + + /* +-NaN return x+y */ + if( ix > 0x7f800000 || iy > 0x7f800000 ) + return x + y; + + /* determine if y is an odd int when x < 0 + * yisint = 0 ... y is not an integer + * yisint = 1 ... y is an odd int + * yisint = 2 ... y is an even int + */ + yisint = 0; + if( hx < 0 ) + { + if( iy >= 0x4b800000 ) + yisint = 2; /* even integer y */ + else if( iy >= 0x3f800000 ) + { + k = ( iy >> 23 ) - 0x7f; /* exponent */ + j = iy >> ( 23 - k ); + if( ( j << ( 23 - k ) ) == iy ) + yisint = 2 - ( j & 1 ); + } + } + + /* special value of y */ + if( iy == 0x7f800000 ) + { /* y is +-inf */ + if( ix == 0x3f800000 ) + return y - y; /* inf**+-1 is NaN */ + else if( ix > 0x3f800000 )/* (|x|>1)**+-inf = inf,0 */ + return ( hy >= 0 ) ? y : zero; + else /* (|x|<1)**-,+inf = inf,0 */ + return ( hy < 0 ) ? -y : zero; + } + + if( iy == 0x3f800000 ) + { /* y is +-1 */ + if( hy < 0 ) + return one / x; + else + return x; + } + + if( hy == 0x40000000 ) + return x * x; /* y is 2 */ + + if( hy == 0x3f000000 ) + { /* y is 0.5 */ + if( hx >= 0 ) /* x >= +0 */ + return sqrt( x ); + } + + ax = fabs( x ); + + /* special value of x */ + if( ix == 0x7f800000 || ix == 0 || ix == 0x3f800000 ) + { + z = ax; /*x is +-0,+-inf,+-1*/ + if( hy < 0 ) + z = one / z; /* z = (1/|x|) */ + if( hx < 0 ) + { + if( ( ( ix - 0x3f800000 ) | yisint ) == 0 ) + z = ( z - z ) / ( z - z ); /* (-1)**non-int is NaN */ + else if( yisint == 1 ) + z = -z; /* (x<0)**odd = -(|x|**odd) */ + } + + return z; + } + + /* (x<0)**(non-int) is NaN */ + if( ( ( ( (unsigned int)hx >> 31 ) - 1 ) | yisint ) == 0 ) + return ( x - x ) / ( x - x ); + + /* |y| is huge */ + if( iy > 0x4d000000 ) + { /* if |y| > 2**27 */ + /* over/underflow if x is not close to one */ + if( ix < 0x3f7ffff8 ) + return ( hy < 0 ) ? huge * huge : tiny * tiny; + + if( ix > 0x3f800007 ) + return ( hy > 0 ) ? huge * huge : tiny * tiny; + /* now |1-x| is tiny <= 2**-20, suffice to compute + log(x) by x-x^2/2+x^3/3-x^4/4 */ + t = x - 1; /* t has 20 trailing zeros */ + w = ( t * t ) * ( (float)0.5 - t * ( (float)0.333333333333 - t * (float)0.25 ) ); + u = ivln2_h * t; /* ivln2_h has 16 sig. bits */ + v = t * ivln2_l - w * ivln2; + t1 = u + v; + GET_FLOAT_WORD( is, t1 ); + SET_FLOAT_WORD( t1, is & 0xfffff000 ); + t2 = v - ( t1 - u ); + } + else + { + float s2, s_h, s_l, t_h, t_l; + n = 0; + /* take care subnormal number */ + if( ix < 0x00800000 ) + { + ax *= two24; + n -= 24; + GET_FLOAT_WORD( ix, ax ); + } + + n += ( ( ix ) >> 23 ) - 0x7f; + j = ix & 0x007fffff; + + /* determine interval */ + ix = j | 0x3f800000; /* normalize ix */ + if( j <= 0x1cc471 ) + k = 0; /* |x|<sqrt(3/2) */ + else if( j < 0x5db3d7 ) + k = 1; /* |x|<sqrt(3) */ + else + { + k = 0; + n += 1; + ix -= 0x00800000; + } + SET_FLOAT_WORD( ax, ix ); + + /* compute s = s_h+s_l = (x-1)/(x+1) or (x-1.5)/(x+1.5) */ + u = ax - bp[ k ]; /* bp[0]=1.0, bp[1]=1.5 */ + v = one / ( ax + bp[ k ] ); + s = u * v; + s_h = s; + GET_FLOAT_WORD( is, s_h ); + SET_FLOAT_WORD( s_h, is & 0xfffff000 ); + /* t_h=ax+bp[k] High */ + SET_FLOAT_WORD( t_h, ( ( ix >> 1 ) | 0x20000000 ) + 0x0040000 + ( k << 21 ) ); + t_l = ax - ( t_h - bp[ k ] ); + s_l = v * ( ( u - s_h * t_h ) - s_h * t_l ); + /* compute log(ax) */ + s2 = s * s; + subr = L3 + s2 * ( L4 + s2 * ( L5 + s2 * L6 ) ); + // chop up expression to keep mac register based stack happy + r = s2 * s2 * ( L1 + s2 * ( L2 + s2 * subr ) ); + r += s_l * ( s_h + s ); + s2 = s_h * s_h; + t_h = (float)3.0 + s2 + r; + GET_FLOAT_WORD( is, t_h ); + SET_FLOAT_WORD( t_h, is & 0xfffff000 ); + t_l = r - ( ( t_h - (float)3.0 ) - s2 ); + /* u+v = s*(1+...) */ + u = s_h * t_h; + v = s_l * t_h + t_l * s; + /* 2/(3log2)*(s+...) */ + p_h = u + v; + GET_FLOAT_WORD( is, p_h ); + SET_FLOAT_WORD( p_h, is & 0xfffff000 ); + p_l = v - ( p_h - u ); + z_h = cp_h * p_h; /* cp_h+cp_l = 2/(3*log2) */ + z_l = cp_l * p_h + p_l * cp + dp_l[ k ]; + /* log2(ax) = (s+..)*2/(3*log2) = n + dp_h + z_h + z_l */ + t = (float)n; + t1 = ( ( ( z_h + z_l ) + dp_h[ k ] ) + t ); + GET_FLOAT_WORD( is, t1 ); + SET_FLOAT_WORD( t1, is & 0xfffff000 ); + t2 = z_l - ( ( ( t1 - t ) - dp_h[ k ] ) - z_h ); + } + + s = one; /* s (sign of result -ve**odd) = -1 else = 1 */ + if( ( ( ( (unsigned int)hx >> 31 ) - 1 ) | ( yisint - 1 ) ) == 0 ) + s = -one; /* (-ve)**(odd int) */ + + /* split up y into y1+y2 and compute (y1+y2)*(t1+t2) */ + GET_FLOAT_WORD( is, y ); + SET_FLOAT_WORD( y1, is & 0xfffff000 ); + p_l = ( y - y1 ) * t1 + y * t2; + p_h = y1 * t1; + z = p_l + p_h; + GET_FLOAT_WORD( j, z ); + + if( j > 0x43000000 ) /* if z > 128 */ + return s * huge * huge; /* overflow */ + else if( j == 0x43000000 ) + { /* if z == 128 */ + if( p_l + ovt > z - p_h ) + return s * huge * huge; /* overflow */ + } + else if( ( j & 0x7fffffff ) > 0x43160000 ) /* z <= -150 */ + return s * tiny * tiny; /* underflow */ + else if( (unsigned int)j == 0xc3160000 ) + { /* z == -150 */ + if( p_l <= z - p_h ) + return s * tiny * tiny; /* underflow */ + } + + /* + * compute 2**(p_h+p_l) + */ + i = j & 0x7fffffff; + k = ( i >> 23 ) - 0x7f; + n = 0; + + if( i > 0x3f000000 ) + { /* if |z| > 0.5, set n = [z+0.5] */ + n = j + ( 0x00800000 >> ( k + 1 ) ); + k = ( ( n & 0x7fffffff ) >> 23 ) - 0x7f; /* new k for n */ + SET_FLOAT_WORD( t, n & ~( 0x007fffff >> k ) ); + n = ( ( n & 0x007fffff ) | 0x00800000 ) >> ( 23 - k ); + + if( j < 0 ) + n = -n; + + p_h -= t; + } + + t = p_l + p_h; + GET_FLOAT_WORD( is, t ); + SET_FLOAT_WORD( t, is & 0xfffff000 ); + u = t * lg2_h; + v = ( p_l - ( t - p_h ) ) * lg2 + t * lg2_l; + z = u + v; + w = v - ( z - u ); + t = z * z; + subt1 = P3 + t * ( P4 + t * P5 ); + // chop up expression to keep mac register based stack happy + t1 = z - t * ( P1 + t * ( P2 + t * subt1 ) ); + r = ( z * t1 ) / ( t1 - two ) - ( w + z * w ); + z = one - ( r - z ); + GET_FLOAT_WORD( j, z ); + j += (n << 23 ); + + if( ( j >> 23 ) <= 0 ) + z = __scalbnf( z, n ); /* subnormal output */ + else + SET_FLOAT_WORD( z, j ); + + return s * z; +} + +#endif + + + +static int randSeed = 0; + +void srand( unsigned seed ) +{ + randSeed = seed; +} + +int rand( void ) +{ + randSeed = ( 69069 * randSeed + 1 ); + return randSeed & 0x7fff; +} + +double atof( const char *string ) +{ + float sign; + float value; + int c; + + // skip whitespace + while( *string <= ' ' ) + { + if( !*string ) + return 0; + + string++; + } + + // check sign + switch( *string ) + { + case '+': + string++; + sign = 1; + break; + + case '-': + string++; + sign = -1; + break; + + default: + sign = 1; + break; + } + + // read digits + value = 0; + c = string[ 0 ]; + + if( c != '.' ) + { + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value = value * 10 + c; + } while( 1 ); + } + else + string++; + + // check for decimal point + if( c == '.' ) + { + double fraction; + + fraction = 0.1; + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value += c * fraction; + fraction *= 0.1; + } while( 1 ); + + } + + // not handling 10e10 notation... + + return value * sign; +} + +double _atof( const char **stringPtr ) +{ + const char *string; + float sign; + float value; + int c = '0'; // bk001211 - uninitialized use possible + + string = *stringPtr; + + // skip whitespace + while( *string <= ' ' ) + { + if( !*string ) + { + *stringPtr = string; + return 0; + } + + string++; + } + + // check sign + switch( *string ) + { + case '+': + string++; + sign = 1; + break; + + case '-': + string++; + sign = -1; + break; + + default: + sign = 1; + break; + } + + // read digits + value = 0; + if( string[ 0 ] != '.' ) + { + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value = value * 10 + c; + } while( 1 ); + } + + // check for decimal point + if( c == '.' ) + { + double fraction; + + fraction = 0.1; + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value += c * fraction; + fraction *= 0.1; + } while( 1 ); + + } + + // not handling 10e10 notation... + *stringPtr = string; + + return value * sign; +} + + +#if defined ( Q3_VM ) + +int atoi( const char *string ) +{ + int sign; + int value; + int c; + + // skip whitespace + while( *string <= ' ' ) + { + if( !*string ) + return 0; + + string++; + } + + // check sign + switch( *string ) + { + case '+': + string++; + sign = 1; + break; + + case '-': + string++; + sign = -1; + break; + + default: + sign = 1; + break; + } + + // read digits + value = 0; + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value = value * 10 + c; + } while( 1 ); + + // not handling 10e10 notation... + + return value * sign; +} + + +int _atoi( const char **stringPtr ) +{ + int sign; + int value; + int c; + const char *string; + + string = *stringPtr; + + // skip whitespace + while( *string <= ' ' ) + { + if( !*string ) + return 0; + + string++; + } + + // check sign + switch( *string ) + { + case '+': + string++; + sign = 1; + break; + + case '-': + string++; + sign = -1; + break; + + default: + sign = 1; + break; + } + + // read digits + value = 0; + do + { + c = *string++; + if( c < '0' || c > '9' ) + break; + + c -= '0'; + value = value * 10 + c; + } while( 1 ); + + // not handling 10e10 notation... + + *stringPtr = string; + + return value * sign; +} + +int abs( int n ) +{ + return n < 0 ? -n : n; +} + +double fabs( double x ) +{ + return x < 0 ? -x : x; +} + +unsigned int _hextoi( const char **stringPtr ) +{ + unsigned int value; + int c; + int i; + const char *string; + + string = *stringPtr; + + // skip whitespace + while( *string <= ' ' ) + { + if( !*string ) + return 0; + + string++; + } + + value = 0; + i = 0; + while( i++ < 8 && ( c = *string++ ) ) + { + if ( c >= '0' && c <= '9' ) + { + value = value * 16 + c - '0'; + continue; + } + else if ( c >= 'a' && c <= 'f' ) + { + value = value * 16 + 10 + c - 'a'; + continue; + } + else if ( c >= 'A' && c <= 'F' ) + { + value = value * 16 + 10 + c - 'A'; + continue; + } + else + break; + } + *stringPtr = string; + return value; +} + +//========================================================= + + +#define ALT 0x00000001 /* alternate form */ +#define HEX 0x00000002 /* hexadecimal */ +#define LADJUST 0x00000004 /* left adjustment */ +#define LONGDBL 0x00000008 /* long double */ +#define LONGINT 0x00000010 /* long integer */ +#define QUADINT 0x00000020 /* quad integer */ +#define SHORTINT 0x00000040 /* short integer */ +#define ZEROPAD 0x00000080 /* zero (as opposed to blank) pad */ +#define FPT 0x00000100 /* floating point number */ +#define UNSIGNED 0x00000200 /* unsigned integer */ + +#define to_digit(c) ((c) - '0') +#define is_digit(c) ((unsigned)to_digit(c) <= 9) +#define to_char(n) ((n) + '0') + +void AddInt( char **buf_p, int val, int width, int flags ) +{ + char text[ 32 ]; + int digits; + char *buf; + + digits = 0; + + if( flags & UNSIGNED ) + val = (unsigned) val; + + if( flags & HEX ) + { + char c; + int n = 0; + + while( n < 32 ) + { + c = "0123456789abcdef"[ ( val >> n ) & 0xF ]; + n += 4; + if( c == '0' && !digits ) + continue; + text[ digits++ ] = c; + } + text[ digits ] = '\0'; + } + else + { + int signedVal = val; + + if( val < 0 ) + val = -val; + do + { + text[ digits++ ] = '0' + val % 10; + val /= 10; + } while( val ); + + if( signedVal < 0 ) + text[ digits++ ] = '-'; + } + + buf = *buf_p; + + if( !( flags & LADJUST ) ) + { + while( digits < width ) + { + *buf++ = ( flags & ZEROPAD ) ? '0' : ' '; + width--; + } + } + + while( digits-- ) + { + *buf++ = text[ digits ]; + width--; + } + + if( flags & LADJUST ) + { + while( width-- > 0 ) + *buf++ = ( flags & ZEROPAD ) ? '0' : ' '; + } + + *buf_p = buf; +} + +void AddFloat( char **buf_p, float fval, int width, int prec ) +{ + char text[ 32 ]; + int digits; + float signedVal; + char *buf; + int val; + + // get the sign + signedVal = fval; + if( fval < 0 ) + fval = -fval; + + // write the float number + digits = 0; + val = (int)fval; + + do + { + text[ digits++ ] = '0' + val % 10; + val /= 10; + } while( val ); + + if( signedVal < 0 ) + text[digits++] = '-'; + + buf = *buf_p; + + while( digits < width ) + { + *buf++ = ' '; + width--; + } + + while( digits-- ) + *buf++ = text[ digits ]; + + *buf_p = buf; + + if( prec < 0 ) + prec = 6; + + // write the fraction + digits = 0; + + while( digits < prec ) + { + fval -= (int)fval; + fval *= 10.0; + val = (int)fval; + text[ digits++ ] = '0' + val % 10; + } + + if( digits > 0 ) + { + buf = *buf_p; + *buf++ = '.'; + for( prec = 0; prec < digits; prec++ ) + *buf++ = text[ prec ]; + + *buf_p = buf; + } +} + +void AddVec3_t( char **buf_p, vec3_t v, int width, int prec ) +{ + char *buf; + + buf = *buf_p; + + *buf++ = '['; + + AddFloat( &buf, v[ 0 ], width, prec ); + buf += width; + *buf++ = ' '; + + AddFloat( &buf, v[ 1 ], width, prec ); + buf += width; + *buf++ = ' '; + + AddFloat( &buf, v[ 2 ], width, prec ); + buf += width; + *buf++ = ']'; + + *buf_p = buf; +} + +void AddString( char **buf_p, char *string, int width, int prec ) +{ + int size; + char *buf; + + buf = *buf_p; + + if( string == NULL ) + { + string = "(null)"; + prec = -1; + } + + if( prec >= 0 ) + { + for( size = 0; size < prec; size++ ) + { + if( string[ size ] == '\0' ) + break; + } + } + else + size = strlen( string ); + + width -= size; + + while( size-- ) + *buf++ = *string++; + + while( width-- > 0 ) + *buf++ = ' '; + + *buf_p = buf; +} + +/* +vsprintf + +I'm not going to support a bunch of the more arcane stuff in here +just to keep it simpler. For example, the '*' and '$' are not +currently supported. I've tried to make it so that it will just +parse and ignore formats we don't support. +*/ +int vsprintf( char *buffer, const char *fmt, va_list argptr ) +{ + int *arg; + char *buf_p; + char ch; + int flags; + int width; + int prec; + int n; + char sign; + + buf_p = buffer; + arg = (int *)argptr; + + while( qtrue ) + { + // run through the format string until we hit a '%' or '\0' + for( ch = *fmt; ( ch = *fmt ) != '\0' && ch != '%'; fmt++ ) + *buf_p++ = ch; + + if( ch == '\0' ) + goto done; + + // skip over the '%' + fmt++; + + // reset formatting state + flags = 0; + width = 0; + prec = -1; + sign = '\0'; + +rflag: + ch = *fmt++; +reswitch: + switch( ch ) + { + case '-': + flags |= LADJUST; + goto rflag; + + case '.': + n = 0; + while( is_digit( ( ch = *fmt++ ) ) ) + n = 10 * n + ( ch - '0' ); + + prec = n < 0 ? -1 : n; + goto reswitch; + + case '0': + flags |= ZEROPAD; + goto rflag; + + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + n = 0; + do + { + n = 10 * n + ( ch - '0' ); + ch = *fmt++; + } while( is_digit( ch ) ); + + width = n; + goto reswitch; + + case 'c': + *buf_p++ = (char)*arg; + arg++; + break; + + case 'u': + flags |= UNSIGNED; + case 'd': + case 'i': + AddInt( &buf_p, *arg, width, flags ); + arg++; + break; + + case 'f': + AddFloat( &buf_p, *(double *)arg, width, prec ); +#ifdef Q3_VM + arg += 1; // everything is 32 bit in my compiler +#else + arg += 2; +#endif + break; + + case 's': + AddString( &buf_p, (char *)*arg, width, prec ); + arg++; + break; + + case 'v': + AddVec3_t( &buf_p, (vec_t *)*arg, width, prec ); + arg++; + break; + + case 'x': + flags |= HEX; + AddInt( &buf_p, *arg, width, prec ); + arg++; + break; + + case '%': + *buf_p++ = ch; + break; + + default: + *buf_p++ = (char)*arg; + arg++; + break; + } + } + +done: + *buf_p = 0; + return buf_p - buffer; +} + + +/* this is really crappy */ +// FIXME: count is still inaccurate in some cases. +int sscanf( const char *buffer, const char *fmt, ... ) +{ + int cmd; + int **arg; + int count; + + arg = (int **)&fmt + 1; + count = 0; + + while( *fmt ) + { + if( fmt[ 0 ] != '%' ) + { + fmt++; + continue; + } + + if( !buffer[ 0 ] ) break; + + cmd = fmt[ 1 ]; + fmt += 2; + + switch( cmd ) + { + case 'i': + case 'd': + case 'u': + **arg = _atoi( &buffer ); + ++count; + break; + case 'f': + *(float *)*arg = _atof( &buffer ); + ++count; + break; + case 'x': + **arg = _hextoi( &buffer ); + ++count; + break; + } + + arg++; + } + + return count; +} + +#endif |