CWE-ou-minkata/MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/CoreLib/hsMatrix33.cpp

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*==LICENSE==*/

#include "hsTypes.h"
#include "hsMatrix33.h"
#include "hsStream.h"

hsMatrix33* hsMatrix33::Reset()
{
	static const hsMatrix33 gIdentity = { 1, 0, 0, 0, 1, 0, 0, 0, 1 };

	*this = gIdentity;
	return this;
}


hsMatrix33* hsMatrix33::SetConcat(const hsMatrix33* a, const hsMatrix33* b)
{
	hsMatrix33	tmpMatrix;
	hsMatrix33*	c;

	c = this;
	if (this == a || this == b)
		c = &tmpMatrix;

	c->fMap[0][0] = a->fMap[0][0] * b->fMap[0][0] + a->fMap[0][1] * b->fMap[1][0] + a->fMap[0][2] * b->fMap[2][0];
	c->fMap[0][1] = a->fMap[0][0] * b->fMap[0][1] + a->fMap[0][1] * b->fMap[1][1] + a->fMap[0][2] * b->fMap[2][1];
	c->fMap[0][2] = a->fMap[0][0] * b->fMap[0][2] + a->fMap[0][1] * b->fMap[1][2] + a->fMap[0][2] * b->fMap[2][2];

	c->fMap[1][0] = a->fMap[1][0] * b->fMap[0][0] + a->fMap[1][1] * b->fMap[1][0] + a->fMap[1][2] * b->fMap[2][0];
	c->fMap[1][1] = a->fMap[1][0] * b->fMap[0][1] + a->fMap[1][1] * b->fMap[1][1] + a->fMap[1][2] * b->fMap[2][1];
	c->fMap[1][2] = a->fMap[1][0] * b->fMap[0][2] + a->fMap[1][1] * b->fMap[1][2] + a->fMap[1][2] * b->fMap[2][2];

	c->fMap[2][0] = a->fMap[2][0] * b->fMap[0][0] + a->fMap[2][1] * b->fMap[1][0] + a->fMap[2][2] * b->fMap[2][0];
	c->fMap[2][1] = a->fMap[2][0] * b->fMap[0][1] + a->fMap[2][1] * b->fMap[1][1] + a->fMap[2][2] * b->fMap[2][1];
	c->fMap[2][2] = a->fMap[2][0] * b->fMap[0][2] + a->fMap[2][1] * b->fMap[1][2] + a->fMap[2][2] * b->fMap[2][2];

	if (this != c)
		*this = *c;
	return this;
}

hsMatrix33 operator*(const hsMatrix33& a, const hsMatrix33& b)
{
	hsMatrix33	c;

	(void)c.SetConcat(&a, &b);
	
	return c;
}

void hsMatrix33::Read(hsStream* s)
{
	int i, j;
	for( i = 0; i < 3; i++ )
	{
		for( j = 0; j < 3; j++ )
		{
			fMap[i][j] = s->ReadSwapScalar();
		}
	}
}

void hsMatrix33::Write(hsStream* s)
{
	int i, j;
	for( i = 0; i < 3; i++ )
	{
		for( j = 0; j < 3; j++ )
		{
			s->WriteSwapScalar(fMap[i][j]);
		}
	}
}