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380 lines
10 KiB
C
380 lines
10 KiB
C
/* Float arithmetic for the Pawn Abstract Machine
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*
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* Copyright (c) Artran, Inc. 1999
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* Written by Greg Garner (gmg@artran.com)
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* This file may be freely used. No warranties of any kind.
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*
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* CHANGES -
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* 2002-08-27: Basic conversion of source from C++ to C by Adam D. Moss
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* <adam@gimp.org> <aspirin@icculus.org>
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* 2003-08-29: Removal of the dynamic memory allocation and replacing two
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* type conversion functions by macros, by Thiadmer Riemersma
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* 2003-09-22: Moved the type conversion macros to AMX.H, and simplifications
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* of some routines, by Thiadmer Riemersma
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* 2003-11-24: A few more native functions (geometry), plus minor modifications,
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* mostly to be compatible with dynamically loadable extension
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* modules, by Thiadmer Riemersma
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* 2004-01-09: Adaptions for 64-bit cells (using "double precision"), by
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* Thiadmer Riemersma
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*/
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#include <stdlib.h> /* for atof() */
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#include <stdio.h> /* for NULL */
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#include <assert.h>
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#include <math.h>
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#include "amx.h"
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/*
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#if defined __BORLANDC__
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#pragma resource "amxFloat.res"
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#endif
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*/
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#if PAWN_CELL_SIZE==32
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#define REAL float
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#elif PAWN_CELL_SIZE==64
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#define REAL double
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#else
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#error Unsupported cell size
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#endif
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#define PI 3.1415926535897932384626433832795
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_float(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = integer value to convert to a float
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*/
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REAL fValue;
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(void)amx;
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/* Convert to a float. Calls the compilers long to float conversion. */
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fValue = (REAL) params[1];
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/* Return the cell. */
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return amx_ftoc(fValue);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_strfloat(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = virtual string address to convert to a float
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*/
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char szSource[60];
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cell *pString;
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REAL fNum;
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int nLen;
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(void)amx;
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/* They should have sent us 1 cell. */
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assert(params[0]/sizeof(cell)==1);
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/* Get the real address of the string. */
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pString=amx_Address(amx,params[1]);
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/* Find out how long the string is in characters. */
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amx_StrLen(pString, &nLen);
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if (nLen == 0 || nLen >= sizeof szSource)
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return 0;
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/* Now convert the Pawn string into a C type null terminated string */
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amx_GetString(szSource, pString, 0, sizeof szSource);
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/* Now convert this to a float. */
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fNum = (REAL)atof(szSource);
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return amx_ftoc(fNum);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatmul(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1
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* params[2] = float operand 2
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*/
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REAL fRes = amx_ctof(params[1]) * amx_ctof(params[2]);
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(void)amx;
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return amx_ftoc(fRes);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatdiv(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float dividend (top)
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* params[2] = float divisor (bottom)
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*/
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REAL fRes = amx_ctof(params[1]) / amx_ctof(params[2]);
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(void)amx;
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return amx_ftoc(fRes);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatadd(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1
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* params[2] = float operand 2
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*/
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REAL fRes = amx_ctof(params[1]) + amx_ctof(params[2]);
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(void)amx;
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return amx_ftoc(fRes);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatsub(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1
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* params[2] = float operand 2
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*/
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REAL fRes = amx_ctof(params[1]) - amx_ctof(params[2]);
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(void)amx;
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return amx_ftoc(fRes);
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}
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/******************************************************************/
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/* Return fractional part of float */
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static cell AMX_NATIVE_CALL n_floatfract(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand
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*/
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REAL fA = amx_ctof(params[1]);
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fA = fA - (REAL)(floor((double)fA));
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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/* Return integer part of float, rounded */
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static cell AMX_NATIVE_CALL n_floatround(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand
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* params[2] = Type of rounding (integer)
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*/
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REAL fA = amx_ctof(params[1]);
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(void)amx;
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switch (params[2])
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{
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case 1: /* round downwards */
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fA = (REAL)(floor((double)fA));
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break;
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case 2: /* round upwards */
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fA = (REAL)(ceil((double)fA));
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break;
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case 3: /* round towards zero (truncate) */
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if ( fA>=0.0 )
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fA = (REAL)(floor((double)fA));
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else
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fA = (REAL)(ceil((double)fA));
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break;
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default: /* standard, round to nearest */
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fA = (REAL)(floor((double)fA+.5));
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break;
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}
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return (cell)fA;
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatcmp(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1
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* params[2] = float operand 2
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*/
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REAL fA, fB;
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(void)amx;
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fA = amx_ctof(params[1]);
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fB = amx_ctof(params[2]);
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if (fA == fB)
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return 0;
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else if (fA>fB)
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return 1;
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else
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return -1;
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatsqroot(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand
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*/
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REAL fA = amx_ctof(params[1]);
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fA = (REAL)sqrt(fA);
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if (fA < 0)
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return amx_RaiseError(amx, AMX_ERR_DOMAIN);
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return amx_ftoc(fA);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatpower(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1 (base)
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* params[2] = float operand 2 (exponent)
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*/
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REAL fA = amx_ctof(params[1]);
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REAL fB = amx_ctof(params[2]);
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fA = (REAL)pow(fA, fB);
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatlog(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1 (value)
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* params[2] = float operand 2 (base)
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*/
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REAL fValue = amx_ctof(params[1]);
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REAL fBase = amx_ctof(params[2]);
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(void)amx;
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if (fValue <= 0.0 || fBase <= 0)
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return amx_RaiseError(amx, AMX_ERR_DOMAIN);
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if (fBase == 10.0) // ??? epsilon
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fValue = (REAL)log10(fValue);
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else
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fValue = (REAL)(log(fValue) / log(fBase));
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return amx_ftoc(fValue);
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}
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static REAL ToRadians(REAL angle, int radix)
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{
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switch (radix)
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{
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case 1: /* degrees, sexagesimal system (technically: degrees/minutes/seconds) */
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return (REAL)(angle * PI / 180.0);
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case 2: /* grades, centesimal system */
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return (REAL)(angle * PI / 200.0);
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default: /* assume already radian */
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return angle;
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} /* switch */
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatsin(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1 (angle)
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* params[2] = float operand 2 (radix)
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*/
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REAL fA = amx_ctof(params[1]);
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fA = ToRadians(fA, params[2]);
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fA = (float)sin(fA);
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatcos(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1 (angle)
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* params[2] = float operand 2 (radix)
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*/
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REAL fA = amx_ctof(params[1]);
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fA = ToRadians(fA, params[2]);
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fA = (float)cos(fA);
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floattan(AMX *amx,const cell *params)
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{
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/*
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* params[0] = number of bytes
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* params[1] = float operand 1 (angle)
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* params[2] = float operand 2 (radix)
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*/
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REAL fA = amx_ctof(params[1]);
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fA = ToRadians(fA, params[2]);
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fA = (float)tan(fA);
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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static cell AMX_NATIVE_CALL n_floatabs(AMX *amx,const cell *params)
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{
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REAL fA = amx_ctof(params[1]);
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fA = (fA >= 0) ? fA : -fA;
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(void)amx;
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return amx_ftoc(fA);
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}
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/******************************************************************/
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/* return the integer part of a real value, truncated
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/* Return integer part of float, truncated (same as floatround
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* with mode 3)
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*/
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static cell AMX_NATIVE_CALL n_floatint(AMX *amx,const cell *params)
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{
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REAL fA = amx_ctof(params[1]);
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if ( fA>=0.0 )
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fA = (REAL)(floor((double)fA));
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else
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fA = (REAL)(ceil((double)fA));
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(void)amx;
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return (cell)fA;
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}
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#if defined __cplusplus
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extern "C"
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#endif
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const AMX_NATIVE_INFO float_Natives[] = {
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{ "float", n_float },
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{ "strfloat", n_strfloat },
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{ "floatmul", n_floatmul },
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{ "floatdiv", n_floatdiv },
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{ "floatadd", n_floatadd },
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{ "floatsub", n_floatsub },
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{ "floatfract", n_floatfract },
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{ "floatround", n_floatround },
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{ "floatcmp", n_floatcmp },
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{ "floatsqroot", n_floatsqroot},
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{ "floatpower", n_floatpower },
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{ "floatlog", n_floatlog },
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{ "floatsin", n_floatsin },
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{ "floatcos", n_floatcos },
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{ "floattan", n_floattan },
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{ "floatabs", n_floatabs },
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{ "floatint", n_floatint }, // also add user-defined operator "="
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{ NULL, NULL } /* terminator */
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};
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int AMXEXPORT AMXAPI amx_FloatInit(AMX *amx)
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{
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return amx_Register(amx,float_Natives,-1);
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}
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int AMXEXPORT AMXAPI amx_FloatCleanup(AMX *amx)
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{
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(void)amx;
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return AMX_ERR_NONE;
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}
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