xform.cpp

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#include "linden_common.h"

#include "xform.h"

LLXform::LLXform()
{
        init();
}

LLXform::~LLXform()
{
}


LLXform* LLXform::getRoot() const
{
        const LLXform* root = this;
        while(root->mParent)
        {
                root = root->mParent;
        }
        return (LLXform*)root;
}

BOOL LLXform::isRoot() const
{
        return (!mParent);
}

BOOL LLXform::isRootEdit() const
{
        return (!mParent);
}

LLXformMatrix::~LLXformMatrix()
{
}

void LLXformMatrix::update()
{
        if (mParent) 
        {
                mWorldPosition = mPosition;
                if (mParent->getScaleChildOffset())
                {
                        mWorldPosition.scaleVec(mParent->getScale());
                }
                mWorldPosition *= mParent->getWorldRotation();
                mWorldPosition += mParent->getWorldPosition();
                mWorldRotation = mRotation * mParent->getWorldRotation();
        }
        else
        {
                mWorldPosition = mPosition;
                mWorldRotation = mRotation;
        }
}

void LLXformMatrix::updateMatrix(BOOL update_bounds)
{
        update();

        mWorldMatrix.initAll(mScale, mWorldRotation, mWorldPosition);

        if (update_bounds && (mChanged & MOVED))
        {
                mMin.mV[0] = mMax.mV[0] = mWorldMatrix.mMatrix[3][0];
                mMin.mV[1] = mMax.mV[1] = mWorldMatrix.mMatrix[3][1];
                mMin.mV[2] = mMax.mV[2] = mWorldMatrix.mMatrix[3][2];

                F32 f0 = (fabs(mWorldMatrix.mMatrix[0][0])+fabs(mWorldMatrix.mMatrix[1][0])+fabs(mWorldMatrix.mMatrix[2][0])) * 0.5f;
                F32 f1 = (fabs(mWorldMatrix.mMatrix[0][1])+fabs(mWorldMatrix.mMatrix[1][1])+fabs(mWorldMatrix.mMatrix[2][1])) * 0.5f;
                F32 f2 = (fabs(mWorldMatrix.mMatrix[0][2])+fabs(mWorldMatrix.mMatrix[1][2])+fabs(mWorldMatrix.mMatrix[2][2])) * 0.5f;

                mMin.mV[0] -= f0; 
                mMin.mV[1] -= f1; 
                mMin.mV[2] -= f2; 

                mMax.mV[0] += f0; 
                mMax.mV[1] += f1; 
                mMax.mV[2] += f2; 
        }
}

void LLXformMatrix::getMinMax(LLVector3& min, LLVector3& max) const
{
        min = mMin;
        max = mMax;
}

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