eldouble.cpp

3D Game Engine Design Source Code非常棒

#include <fstream.h>
#include "elemdbm.h"
#include "elements.h"

// class information
const char* mgcDouble::description = "d";
const int mgcDouble::size = sizeof(double);
const int mgcDouble::type = mgcDouble::Register();

// error handling
int mgcDouble::verbose = 0;
unsigned mgcDouble::error = 0;
const unsigned mgcDouble::registration_failed = 0x00000001;
const char* mgcDouble::message[1] = {
    "registration failed"
};

//===========================================================================
int mgcDouble::
Register ()
{
	static int first_time = 1;
	if ( first_time == 0 )
		return mgcDouble::type;
	first_time = 0;

	mgcElementDBM::ElementRecord er;
	er.addrtype = &mgcDouble::type;
	er.description = mgcDouble::description;
	er.memory_size = mgcDouble::size;
	er.packed_size = mgcDouble::size;
	er.input = mgcDouble::Input;
	er.output = mgcDouble::Output;
	er.reverse = mgcElementDBM::Reverse8;
	er.pack = 0;
	er.unpack = 0;
	er.convert_to = 0;

	if ( mgcDouble::type != mgcElementDBM::AddType(er) ) {
		Report(registration_failed);
		return -1;
	}

	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcChar::type,mgcDouble::ToChar);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcUchar::type,mgcDouble::ToUchar);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcShort::type,mgcDouble::ToShort);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcUshort::type,mgcDouble::ToUshort);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcInt::type,mgcDouble::ToInt);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcUint::type,mgcDouble::ToUint);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcLong::type,mgcDouble::ToLong);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcUlong::type,mgcDouble::ToUlong);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcFloat::type,mgcDouble::ToFloat);
	mgcElementDBM::AddConvert
		(mgcDouble::type,mgcDouble::type,mgcDouble::ToDouble);

	return mgcDouble::type;
}
//---------------------------------------------------------------------------
mgcDouble& mgcDouble::
operator= (const mgcElement& element)
{
	mgcElementDBM::EFconvert convert =
		mgcElementDBM::record[element.type].convert_to[type];
	if ( convert )
		convert(1,element.data,data);
	return *this;
}
//---------------------------------------------------------------------------
#define CONVERSION(ToType,type)                                             \
void mgcDouble::                                                            \
ToType (int quantity, void* src, void* trg)                                 \
{                                                                           \
	register double* psrc = (double*)src;                                   \
	register type* ptrg = (type*)trg;                                       \
	for (register long i = 0; i < quantity; i++, psrc++, ptrg++)            \
		*ptrg = (type)(*psrc);                                              \
}

CONVERSION(ToChar,char);
CONVERSION(ToUchar,unsigned char);
CONVERSION(ToShort,short);
CONVERSION(ToUshort,unsigned short);
CONVERSION(ToInt,int);
CONVERSION(ToUint,unsigned int);
CONVERSION(ToLong,long);
CONVERSION(ToUlong,unsigned long);
CONVERSION(ToFloat,float);
CONVERSION(ToDouble,double);
//---------------------------------------------------------------------------
int mgcDouble::
Number (unsigned single_error)
{
	int result;
	for (result = -1; single_error; single_error >>= 1)
		result++;
	return result;
}
//---------------------------------------------------------------------------
void mgcDouble::
Report (unsigned single_error)
{
	if ( mgcElement::verbose || mgcDouble::verbose )
		cout << "mgcDouble: " << message[Number(single_error)] << endl;
	else
		ofstream("eldouble.err",ios::out|ios::app)
			 << "mgcDouble: " << message[Number(single_error)] << endl;

	error |= single_error;
}
//---------------------------------------------------------------------------
void mgcDouble::
Report (ostream& ostr)
{
    for (unsigned single_error = 1; single_error; single_error <<= 1)
		if ( error & single_error )
			ostr << "mgcDouble: " << message[Number(single_error)] << endl;

	error = 0;
}
//=========================================================================