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/**
* @file llwaterpatch.cpp
* @brief LLWaterTri class implementation
*
* Copyright (c) 2001-2007, Linden Research, Inc.
*
* 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
*/
#include "llviewerprecompiledheaders.h"
#include "llwaterpatch.h"
#include "llvowater.h"
U32 LLWaterTri::sMinStep;
LL2Coord LLWaterTri::sCam;
F32 LLWaterTri::sClipFar;
U32 LLWaterTri::sMaxDivLevel;
BOOL LLWaterTri::sCurrRound = FALSE;
LLWaterTri::LLWaterTri (U8 level, S8 type, LLWaterTri* par): LLRoamTriNode(level, type, par), mRefine(FALSE)
{
if (!parent() || type == 0)
{
mSize = mLvtx.distance(mRvtx) * sMinStep;
mCurr = sCurrRound;
setNotUpToDate();
return;
}
mSize = par->size() * OO_SQRT2;
setPatch(par->patch());
// LL2Coord c1 = par->Lvtx();
// LL2Coord c2 = par->Rvtx();
// if (c1.x() - c2.x() == 1 || c1.y() - c2.y() == 1)
// bool stophere = true;
if (type < 0) // left child
{
mLvtx = par->Tvtx();
mRvtx = par->Lvtx();
//mTvtx = middle(c1, c2);
} else {
mRvtx = par->Tvtx();
mLvtx = par->Rvtx();
//mTvtx = middle(c1, c2);
}
mTvtx = par->middleSide();
mMiddle = mLvtx.middle(mRvtx);
if (((LLWaterPatch*)patch())->visible())
setNotUpToDate();
else
setUpToDate();
}
void LLWaterTri::updatePassive()
{
setUpToDate();
if (!leaf())
{
mLchild->updatePassive();
mRchild->updatePassive();
}
}
BOOL LLWaterTri::refine()
{
if (upToDate())
return mRefine;
if (!patch()->refine(this))
{
setUpToDate();
mRefine = FALSE;
return mRefine;
}
const static F32 a = 0.6f;
const static F32 K = sMinStep / 50.f;//0.08f;
const static F32 eps = K;//0.01f;
const F32 tri_dist = llmin(sCam.distance(middleSide()) * sMinStep, sClipFar);
const F32 func = K * (1 - (1 - eps) * exp(a * (tri_dist - sClipFar)));
//const F32 tri_size = distance(mLvtx, mRvtx) * sMinStep;// * min_step2;
const F32 ratio = mSize / (tri_dist + 1);
if (tri_dist > 0.8 * sClipFar)
mRefine = ratio > func;
else
mRefine = (ratio > func) && (mLevel < sMaxDivLevel);
if (!mRefine && !mLeaf)
{
if (mLchild->refine())
mRefine = TRUE;
else if (mRchild->refine())
mRefine = TRUE;
}
setUpToDate();
return mRefine;
//return mGrid->refine(this);
//return FALSE;
}
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