Serious-Engine/Sources/Engine/Math/Float.cpp

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2016-03-11 14:57:17 +01:00
/* Copyright (c) 2002-2012 Croteam Ltd. All rights reserved. */
#include "stdh.h"
#include <Engine/Math/Float.h>
/* Get current precision setting of FPU. */
enum FPUPrecisionType GetFPUPrecision(void)
{
// get control flags from FPU
ULONG fpcw = _control87( 0, 0);
// extract the precision from the flags
switch(fpcw&_MCW_PC) {
case _PC_24:
return FPT_24BIT;
break;
case _PC_53:
return FPT_53BIT;
break;
case _PC_64:
return FPT_64BIT;
break;
default:
ASSERT(FALSE);
return FPT_24BIT;
};
}
/* Set current precision setting of FPU. */
void SetFPUPrecision(enum FPUPrecisionType fptNew)
{
ULONG fpcw;
// create FPU flags from the precision
switch(fptNew) {
case FPT_24BIT:
fpcw=_PC_24;
break;
case FPT_53BIT:
fpcw=_PC_53;
break;
case FPT_64BIT:
fpcw=_PC_64;
break;
default:
ASSERT(FALSE);
fpcw=_PC_24;
};
// set the FPU precission
_control87( fpcw, MCW_PC);
}
/////////////////////////////////////////////////////////////////////
// CSetFPUPrecision
/*
* Constructor with automatic setting of FPU precision.
*/
CSetFPUPrecision::CSetFPUPrecision(enum FPUPrecisionType fptNew)
{
// remember old precision
sfp_fptOldPrecision = GetFPUPrecision();
// set new precision if needed
sfp_fptNewPrecision = fptNew;
if (sfp_fptNewPrecision!=sfp_fptOldPrecision) {
SetFPUPrecision(fptNew);
}
}
/*
* Destructor with automatic restoring of FPU precision.
*/
CSetFPUPrecision::~CSetFPUPrecision(void)
{
// check consistency
ASSERT(GetFPUPrecision()==sfp_fptNewPrecision);
// restore old precision if needed
if (sfp_fptNewPrecision!=sfp_fptOldPrecision) {
SetFPUPrecision(sfp_fptOldPrecision);
}
}
BOOL IsValidFloat(float f)
{
return _finite(f) && (*(ULONG*)&f)!=0xcdcdcdcdUL;
/* int iClass = _fpclass(f);
return
iClass==_FPCLASS_NN ||
iClass==_FPCLASS_ND ||
iClass==_FPCLASS_NZ ||
iClass==_FPCLASS_PZ ||
iClass==_FPCLASS_PD ||
iClass==_FPCLASS_PN;
*/
}
BOOL IsValidDouble(double f)
{
return _finite(f) && (*(unsigned __int64*)&f)!=0xcdcdcdcdcdcdcdcdI64;
/* int iClass = _fpclass(f);
return
iClass==_FPCLASS_NN ||
iClass==_FPCLASS_ND ||
iClass==_FPCLASS_NZ ||
iClass==_FPCLASS_PZ ||
iClass==_FPCLASS_PD ||
iClass==_FPCLASS_PN;
*/
}