Imported existing code

indra/llmath/xform.cpp

@@ -0,0 +1,120 @@
+/** 
+ * @file xform.cpp
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#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;
+}