761 lines
19 KiB
C++
761 lines
19 KiB
C++
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// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "std3d.h"
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#include "nel/3d/water_height_map.h"
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#include "nel/misc/common.h"
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#include "nel/misc/debug.h"
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#include "nel/misc/vector_2f.h"
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#include <algorithm>
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#include <cmath>
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namespace NL3D
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{
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//===========================================================================================
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CWaterHeightMap::CWaterHeightMap() : Date(-1),
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_WavesEnabled(false),
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_Damping(0.97f),
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_FilterWeight(4),
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_UnitSize(0.6f),
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_WaveIntensity(0),
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_WavePeriod(0),
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_WaveImpulsionRadius(3),
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_BorderWaves(true),
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_EmitEllapsedTime(0),
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_PropagateEllapsedTime(0),
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_PropagationTime(0.10f),
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_X(0),
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_Y(0),
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_NewX(0),
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_NewY(0),
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_CurrMap(0),
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_Size(0)
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{
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}
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//===========================================================================================
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void CWaterHeightMap::setPropagationTime(float time)
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{
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_PropagationTime = time;
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_PropagateEllapsedTime = 0;
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for (uint k = 0; k < NumWaterMap; ++k)
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{
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clearArea(k, 0, 0, _Size << 1, _Size << 1);
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}
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}
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//===========================================================================================
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void CWaterHeightMap::updateUserPos()
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{
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const sint x = _NewX;
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const sint y = _NewY;
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nlassert(_Size != 0);
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if ((uint) x == _X && (uint) y == _Y) return;
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if ((uint) abs((long int)(x - _X)) < _Size && (uint) abs((long int)(y - _Y)) < _Size) // are there common pixels with the previous location?
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{
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// compute zone
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sint XDivSize;
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if ((sint) _X >= 0) XDivSize = (sint) _X / (sint) _Size;
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else XDivSize = ((sint) (_X + 1) / (sint) _Size) - 1;
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sint YDivSize;
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if ((sint) _Y >= 0) YDivSize = (sint) _Y / (sint) _Size;
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else YDivSize = ((sint) (_Y + 1) / (sint) _Size) - 1;
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sint xDivSize;
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if (x >= 0) xDivSize = (sint) x / (sint) _Size;
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else xDivSize = ((sint) (x + 1) / (sint) _Size) - 1;
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sint yDivSize;
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if (y >= 0) yDivSize = (sint) y / (sint) _Size;
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else yDivSize = ((sint) (y + 1) / (sint) _Size) - 1;
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// different zone -> must decal datas
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if (xDivSize != XDivSize || yDivSize != YDivSize)
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{
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sint left = std::max(x, (sint) _X);
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sint top = std::max(y, (sint) _Y);
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sint right = std::min(x + (sint) _Size, (sint) (_X + _Size));
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sint bottom = std::min(y + (sint) _Size, (sint) (_Y + _Size));
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sint offsetX, offsetY;
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if (xDivSize != XDivSize)
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{
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offsetX = xDivSize < XDivSize ? _Size : -(sint)_Size;
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}
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else
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{
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offsetX = 0;
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}
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if (yDivSize != YDivSize)
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{
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offsetY = yDivSize < YDivSize ? _Size : -(sint)_Size;
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}
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else
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{
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offsetY = 0;
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}
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sint orgX = _Size * XDivSize;
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sint orgY = _Size * YDivSize;
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for (uint k = 0; k < NumWaterMap; ++k)
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{
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makeCpy(k, (uint) (left - orgX + offsetX) , (uint) (top - orgY + offsetY),
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(uint) (left - orgX), (uint) (top - orgY),
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(uint) (right - left), (uint) (bottom - top));
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}
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}
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sint newOrgX = _Size * xDivSize;
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sint newOrgY = _Size * yDivSize;
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// clear new area
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if (x == (sint) _X)
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{
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if (y < (sint) _Y)
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{
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// x, y, width, height
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clearZone(x - newOrgX, y - newOrgY, _Size, _Y - y);
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}
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else
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{
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clearZone(x - newOrgX, y + _Size - newOrgY, _Size, y - _Y);
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}
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}
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else
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{
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if (x > (sint) _X)
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{
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if (y == (sint) _Y)
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{
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clearZone(_X + _Size - newOrgX, y - newOrgY, x - _X, _Size);
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}
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else if (y < (sint) _Y)
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{
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clearZone(_X + _Size - newOrgX, _Y - newOrgY, x - _X, _Size - (_Y - y));
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clearZone(x - newOrgX, y - newOrgY, _Size, _Y - y);
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}
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else
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{
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clearZone(_X + _Size - newOrgX, y - newOrgY, x - _X, _Size - (y - _Y));
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clearZone(x - newOrgX, _Y + _Size - newOrgY, _Size, y - _Y);
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}
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}
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else
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{
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if (y == (sint) _Y)
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{
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clearZone(x - newOrgX, y - newOrgY, _X - x, _Size);
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}
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else if (y < (sint) _Y)
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{
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clearZone(x - newOrgX, y - newOrgY, _Size, _Y - y);
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clearZone(x - newOrgX, _Y - newOrgY, _X - x, _Size - (_Y - y));
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}
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else
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{
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clearZone(x - newOrgX, y - newOrgY, _X - x, _Size - (y -_Y));
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clearZone(x - newOrgX, _Y + _Size - newOrgY, _Size, y - _Y);
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}
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}
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}
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}
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else
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{
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// the new area has no common pixel's with the previous one
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// clear the whole new area
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uint px = _X % _Size;
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uint py = _Y % _Size;
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clearZone(px, py, _Size, _Size);
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}
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_X = (uint) x;
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_Y = (uint) y;
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}
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//===========================================================================================
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void CWaterHeightMap::animatePart(float startTime, float endTime)
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{
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if (endTime < 0.5f * _PropagationTime)
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{
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// perform propagation
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propagate((uint) (_Size * 2.f * startTime / _PropagationTime), (uint) (_Size * 2.f * endTime / _PropagationTime));
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}
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else
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{
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// end propagation and start filter
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if (startTime < 0.5f * _PropagationTime)
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{
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propagate((uint) (_Size * 2.f * startTime / _PropagationTime), _Size);
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filter(0, (uint) (_Size * 2.f * (endTime / _PropagationTime - 0.5f)));
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}
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else
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{
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filter((uint) (_Size * 2.f * (startTime / _PropagationTime - 0.5f)), (uint) (_Size * 2.f * (endTime / _PropagationTime - 0.5f)));
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}
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}
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}
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//===========================================================================================
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void CWaterHeightMap::animate(float deltaT)
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{
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if (deltaT < 0) deltaT = 0;
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if (deltaT > _PropagationTime)
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{
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animatePart(0, _PropagationTime);
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swapBuffers(deltaT);
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_PropagateEllapsedTime = 0;
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}
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else
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{
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const float endTime = _PropagateEllapsedTime + deltaT;
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const float startTime = _PropagateEllapsedTime;
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if (endTime < _PropagationTime)
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{
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animatePart(startTime, endTime);
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_PropagateEllapsedTime = endTime;
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}
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else
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{
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animatePart(startTime, _PropagationTime);
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swapBuffers(deltaT);
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//animatePart(0, endTime - _PropagationTime);
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_PropagateEllapsedTime = 0 /*endTime - _PropagationTime*/;
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}
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}
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animateWaves(deltaT);
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}
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//===========================================================================================
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void CWaterHeightMap::setSize(uint32 size)
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{
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nlassert(size > 4);
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_Size = size;
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for (uint k = 0; k < NumWaterMap; ++k)
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{
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_Map[k].resize(4 * _Size * _Size);
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clearArea(k, 0, 0, _Size << 1, _Size << 1);
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}
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//_Grad.resize(4 * _Size * _Size);
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}
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//===========================================================================================
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void CWaterHeightMap::makeCpy(uint buffer, uint dX, uint dY, uint sX, uint sY, uint width, uint height)
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{
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if (width == 0 || height == 0) return;
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nlassert(dX <= (2 * _Size));
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nlassert(dY <= (2 * _Size));
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nlassert(sX <= (2 * _Size));
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nlassert(sY <= (2 * _Size));
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nlassert(dX + width <= 2 * _Size);
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nlassert(sX + width <= 2 * _Size);
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nlassert(dY + height <= 2 * _Size);
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nlassert(sY + height <= 2 * _Size);
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sint stepY;
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float *src, *dest;
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const sint stride = _Size << 1;
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if (dY <= sY)
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{
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stepY = stride;
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src = &_Map[buffer][sX + sY * stride];
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dest = &_Map[buffer][dX + dY * stride];
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}
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else
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{
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stepY = -stride;
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src = &_Map[buffer][sX + (sY + height - 1) * stride];
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dest = &_Map[buffer][dX + (dY + height - 1) * stride];
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}
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sint k = height;
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do
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{
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if (dest < src)
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{
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std::copy(src, src + width, dest);
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}
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else
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{
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float *rSrc = src + width;
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float *rDest = dest + width;
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do
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{
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--rSrc;
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--rDest;
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*rDest = *rSrc;
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}
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while (rSrc != src);
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}
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src += stepY;
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dest += stepY;
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}
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while (--k);
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}
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//===========================================================================================
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void CWaterHeightMap::setUserPos(sint x, sint y)
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{
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_NewX = x;
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_NewY = y;
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}
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//===========================================================================================
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void CWaterHeightMap::getUserPos(sint &x, sint &y) const
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{
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x = (sint) _X; y = (sint) _Y;
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}
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//===========================================================================================
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void CWaterHeightMap::propagate(uint start, uint end)
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{
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start = std::max(1u, start);
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end = std::min((uint) (_Size - 1), end);
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const float damping = _Damping;
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clearBorder(0);
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clearBorder(1);
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nlassert(_Size != 0);
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sint x, y;
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uint px = _X % _Size;
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uint py = _Y % _Size;
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sint offset = px + 1 + ((py + start) * (_Size << 1));
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//nlinfo("%d, %d, %d", (_CurrMap + (NumWaterMap - 1)) % NumWaterMap, _CurrMap,
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float *buf2 = &_Map[ (_CurrMap + (NumWaterMap - 1)) % NumWaterMap][offset];
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float *buf1 = &_Map[_CurrMap][offset];
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float *dest = &_Map[(_CurrMap + 1) % NumWaterMap][offset];
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const sint sizeX2 = _Size << 1;
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y = end - start;
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if (y <= 0) return;
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do
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{
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x = _Size - 2;
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do
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{
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*dest = damping * ( 0.5f * (buf1[1] + buf1[-1] + buf1[sizeX2] + buf1[- sizeX2]) - *buf2);
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++buf1;
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++buf2;
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++dest;
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}
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while (--x);
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buf1 = buf1 + _Size + 2;
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buf2 = buf2 + _Size + 2;
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|
dest = dest + _Size + 2;
|
||
|
|
}
|
||
|
|
while (--y);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::filter(uint start, uint end)
|
||
|
|
{
|
||
|
|
start = std::max(1u, start);
|
||
|
|
end = std::min((uint) (_Size - 1), end);
|
||
|
|
const float blurCoeff = _FilterWeight;
|
||
|
|
nlassert(_Size != 0);
|
||
|
|
sint x, y;
|
||
|
|
uint px = _X % _Size;
|
||
|
|
uint py = _Y % _Size;
|
||
|
|
sint offset = px + 1 + ((py + start) * (_Size << 1));
|
||
|
|
float *buf = &_Map[ (_CurrMap + 1) % NumWaterMap ][offset];
|
||
|
|
//NLMISC::CVector2f *ptGrad = &_Grad[offset];
|
||
|
|
y = end - start;
|
||
|
|
if (y <= 0) return;
|
||
|
|
const float totalBlurCoeff = (1.f / (4.f + blurCoeff));
|
||
|
|
const sint sizeX2 = _Size << 1;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
x = _Size - 2;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
*buf = totalBlurCoeff * (*buf * blurCoeff
|
||
|
|
+ buf[1]
|
||
|
|
+ buf[-1]
|
||
|
|
+ buf[sizeX2]
|
||
|
|
+ buf[- sizeX2]
|
||
|
|
);
|
||
|
|
// compute gradient
|
||
|
|
/*ptGrad->x = buf[1] - buf[- 1];
|
||
|
|
ptGrad->y = buf[sizeX2] - buf[- sizeX2];*/
|
||
|
|
|
||
|
|
++buf;
|
||
|
|
//++ptGrad;
|
||
|
|
}
|
||
|
|
while (--x);
|
||
|
|
buf += _Size + 2;
|
||
|
|
//ptGrad += _Size + 2;
|
||
|
|
}
|
||
|
|
while (--y);
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::animateWaves(float deltaT)
|
||
|
|
{
|
||
|
|
if (_WavesEnabled)
|
||
|
|
{
|
||
|
|
uint numWaves;
|
||
|
|
if (_WavePeriod == 0)
|
||
|
|
{
|
||
|
|
numWaves = 1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_EmitEllapsedTime += deltaT;
|
||
|
|
if (_EmitEllapsedTime > _WavePeriod)
|
||
|
|
{
|
||
|
|
numWaves = (uint) (_EmitEllapsedTime / _WavePeriod);
|
||
|
|
_EmitEllapsedTime -= numWaves * _WavePeriod;
|
||
|
|
if (numWaves > 10) numWaves = 10;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
numWaves = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
uint k;
|
||
|
|
// generate automatic waves
|
||
|
|
if (!_BorderWaves)
|
||
|
|
{
|
||
|
|
if (_WaveIntensity != 0)
|
||
|
|
{
|
||
|
|
for (k = 0; k < numWaves; ++k)
|
||
|
|
{
|
||
|
|
perturbate(_NewX + rand() % _Size, _NewY + rand() % _Size, _WaveImpulsionRadius, _WaveIntensity);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
switch(rand() & 3) // choose a random border
|
||
|
|
{
|
||
|
|
case 0: // top border
|
||
|
|
for (k = 0; k < numWaves; ++k)
|
||
|
|
{
|
||
|
|
perturbate(_NewX + (uint) rand() % _Size, _NewY, _WaveImpulsionRadius, _WaveIntensity);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 1: // bottom border
|
||
|
|
for (k = 0; k < numWaves; ++k)
|
||
|
|
{
|
||
|
|
perturbate(_NewX + (uint) rand() % _Size, _NewY + _Size - 1, _WaveImpulsionRadius, _WaveIntensity);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 2: // right border
|
||
|
|
for (k = 0; k < numWaves; ++k)
|
||
|
|
{
|
||
|
|
perturbate(_NewX + _Size - 1, _NewY + (uint) rand() % _Size, _WaveImpulsionRadius, _WaveIntensity);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 3: // left border
|
||
|
|
for (k = 0; k < numWaves; ++k)
|
||
|
|
{
|
||
|
|
perturbate(_NewX, _NewY + (uint) rand() % _Size, _WaveImpulsionRadius, _WaveIntensity);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::swapBuffers(float deltaT)
|
||
|
|
{
|
||
|
|
updateUserPos();
|
||
|
|
_CurrMap = (_CurrMap + 1) % NumWaterMap;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::clearZone(sint x, sint y, sint width, sint height)
|
||
|
|
{
|
||
|
|
for (uint k = 0; k < NumWaterMap; ++k)
|
||
|
|
{
|
||
|
|
clearArea(k, x, y, width, height);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::clearArea(uint8 currMap, sint x, sint y, sint width, sint height)
|
||
|
|
{
|
||
|
|
nlassert(_Size > 1);
|
||
|
|
nlassert(width >= 0);
|
||
|
|
nlassert(height >= 0);
|
||
|
|
uint sizex2 = _Size << 1;
|
||
|
|
|
||
|
|
if (x < 0)
|
||
|
|
{
|
||
|
|
width += x;
|
||
|
|
x = 0;
|
||
|
|
if (width <= 0) return;
|
||
|
|
}
|
||
|
|
if (y < 0)
|
||
|
|
{
|
||
|
|
height += y;
|
||
|
|
y = 0;
|
||
|
|
if (height <= 0) return;
|
||
|
|
}
|
||
|
|
if (x + width > (sint) sizex2)
|
||
|
|
{
|
||
|
|
width = width - (x + width - sizex2);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (y + height > (sint) sizex2)
|
||
|
|
{
|
||
|
|
height = height - (y + height - sizex2);
|
||
|
|
}
|
||
|
|
|
||
|
|
float *dest = &*(_Map[ currMap ].begin() + x + (_Size << 1) * y);
|
||
|
|
do
|
||
|
|
{
|
||
|
|
std::fill(dest, dest + width, 0.f);
|
||
|
|
dest += (_Size << 1);
|
||
|
|
}
|
||
|
|
while (-- height);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::perturbate(sint x, sint y, sint radius, float intensity)
|
||
|
|
{
|
||
|
|
nlassert(_Size != 0);
|
||
|
|
nlassert(radius > 0);
|
||
|
|
sint orgX = _X - _X % _Size;
|
||
|
|
sint orgY = _Y - _Y % _Size;
|
||
|
|
TFloatVect &map = _Map[(_CurrMap + 1) % NumWaterMap];
|
||
|
|
const uint sizeX2 = _Size << 1;
|
||
|
|
for (sint px = -radius + 1; px < radius; ++px)
|
||
|
|
{
|
||
|
|
for (sint py = -radius + 1; py < radius; ++py)
|
||
|
|
{
|
||
|
|
if ((uint) (x + px - orgX) < sizeX2
|
||
|
|
&& (uint) (y + py - orgY) < sizeX2)
|
||
|
|
{
|
||
|
|
|
||
|
|
float dist = ((float) radius - sqrtf((float) (px * px + py * py ))) / (float) radius;
|
||
|
|
float v = dist < radius ? intensity * cosf(dist * (float) NLMISC::Pi * 0.5f) : 0.f;
|
||
|
|
map[x + px - orgX + sizeX2 * (y + py - orgY)] = v;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::perturbate(const NLMISC::CVector2f &pos, float strenght, float radius)
|
||
|
|
{
|
||
|
|
const float invUnitSize = 1.f / _UnitSize;
|
||
|
|
perturbate((sint) (pos.x * invUnitSize), (sint) (pos.y * invUnitSize), (sint) radius, strenght);
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::perturbatePoint(sint x, sint y, float intensity)
|
||
|
|
{
|
||
|
|
sint orgX = _X - _X % _Size;
|
||
|
|
sint orgY = _Y - _Y % _Size;
|
||
|
|
uint X = (uint) (x - orgX);
|
||
|
|
uint Y = (uint) (y - orgY);
|
||
|
|
if (X < (_Size << 1)
|
||
|
|
&& Y < (_Size << 1)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
const uint sizex2 = _Size << 1;
|
||
|
|
TFloatVect &map = _Map[(_CurrMap + 1) % NumWaterMap];
|
||
|
|
map[X + sizex2 * Y] = intensity;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::perturbatePoint(const NLMISC::CVector2f &pos, float strenght)
|
||
|
|
{
|
||
|
|
const float invUnitSize = 1.f / _UnitSize;
|
||
|
|
perturbatePoint((sint) (pos.x * invUnitSize), (sint) (pos.y * invUnitSize), strenght);
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::clearBorder(uint currMap)
|
||
|
|
{
|
||
|
|
float *map = &_Map[currMap][0];
|
||
|
|
uint sizex2 = _Size << 1;
|
||
|
|
|
||
|
|
// top and bottom
|
||
|
|
|
||
|
|
float *up = &map[(_X % _Size) + sizex2 * (_Y % _Size)];
|
||
|
|
float *curr = up;
|
||
|
|
const float *endUp = up + _Size;
|
||
|
|
const uint downOff = (_Size - 1) * sizex2;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
*curr = curr[downOff] = 0.f;
|
||
|
|
++curr;
|
||
|
|
}
|
||
|
|
while (curr != endUp);
|
||
|
|
|
||
|
|
// right and left
|
||
|
|
curr = up;
|
||
|
|
const float *endLeft = up + downOff;
|
||
|
|
const uint rightOff = _Size - 1;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
*curr = curr[rightOff] = 0.f;
|
||
|
|
curr += sizex2;
|
||
|
|
}
|
||
|
|
while (curr != endLeft);
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::setWaves(float intensity, float period, uint radius, bool border)
|
||
|
|
{
|
||
|
|
_WaveIntensity = intensity;
|
||
|
|
_WavePeriod = period;
|
||
|
|
_WaveImpulsionRadius = radius;
|
||
|
|
_BorderWaves = border;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
void CWaterHeightMap::serial(NLMISC::IStream &f) throw(NLMISC::EStream)
|
||
|
|
{
|
||
|
|
f.xmlPushBegin("WaterHeightMap");
|
||
|
|
f.xmlSetAttrib ("NAME") ;
|
||
|
|
f.serial (_Name);
|
||
|
|
f.xmlPushEnd();
|
||
|
|
(void)f.serialVersion(0);
|
||
|
|
f.xmlSerial(_Size, "SIZE");
|
||
|
|
if (f.isReading())
|
||
|
|
{
|
||
|
|
setSize(_Size);
|
||
|
|
}
|
||
|
|
f.xmlSerial(_Damping, "DAMPING");
|
||
|
|
f.xmlSerial(_FilterWeight, "FILTER_WEIGHT");
|
||
|
|
f.xmlSerial(_UnitSize, "WATER_UNIT_SIZE");
|
||
|
|
f.xmlSerial(_WavesEnabled, "WavesEnabled");
|
||
|
|
if (_WavesEnabled)
|
||
|
|
{
|
||
|
|
f.xmlPush("WavesParams");
|
||
|
|
f.xmlSerial(_WaveIntensity, "WAVE_INTENSITY");
|
||
|
|
f.xmlSerial(_WavePeriod, "WAVE_PERIOD");
|
||
|
|
f.xmlSerial(_WaveImpulsionRadius, "WAVE_IMPULSION_RADIUS");
|
||
|
|
f.xmlSerial(_BorderWaves, "BORDER_WAVES");
|
||
|
|
f.xmlSerial(_PropagationTime, "PROPAGATION_TIME");
|
||
|
|
f.xmlPop();
|
||
|
|
}
|
||
|
|
f.xmlPop();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//*** perform a bilinear on 4 values
|
||
|
|
// 0---1
|
||
|
|
// | |
|
||
|
|
// 3---2
|
||
|
|
static float inline BilinFilter(float v0, float v1, float v2, float v3, float u, float v)
|
||
|
|
{
|
||
|
|
const float g = v * v3 + (1.f - v) * v0;
|
||
|
|
const float h = v * v2 + (1.f - v) * v1;
|
||
|
|
return u * h + (1.f - u) * g;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//===========================================================================================
|
||
|
|
|
||
|
|
float CWaterHeightMap::getHeight(const NLMISC::CVector2f &pos)
|
||
|
|
{
|
||
|
|
const float invUnitSize = 1.f / _UnitSize;
|
||
|
|
|
||
|
|
const float xPos = invUnitSize * pos.x; // position in map space
|
||
|
|
const float yPos = invUnitSize * pos.y; // position in map space
|
||
|
|
|
||
|
|
|
||
|
|
if ((uint) xPos - _X < _Size - 1
|
||
|
|
&& (uint) yPos - _Y < _Size - 1
|
||
|
|
)
|
||
|
|
|
||
|
|
{
|
||
|
|
|
||
|
|
const sint orgX = _X - _X % _Size;
|
||
|
|
const sint orgY = _Y - _Y % _Size;
|
||
|
|
const uint sizeX2 = _Size << 1;
|
||
|
|
|
||
|
|
|
||
|
|
const sint fxPos = (sint) floorf(xPos);
|
||
|
|
const sint fyPos = (sint) floorf(yPos);
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
const float deltaU = xPos - fxPos;
|
||
|
|
const float deltaV = yPos - fyPos;
|
||
|
|
const uint offset = (uint) fxPos - orgX + sizeX2 * ( (uint) fyPos - orgY);
|
||
|
|
const float lambda = getBufferRatio();
|
||
|
|
const float *map1 = getPrevPointer();
|
||
|
|
const float *map2 = getPointer();
|
||
|
|
|
||
|
|
return BilinFilter(lambda * map2[offset] + (1.f - lambda) * map1[offset ], // top left
|
||
|
|
lambda * map2[offset + 1] + (1.f - lambda) * map1[offset + 1], // top right
|
||
|
|
lambda * map2[offset + sizeX2 + 1] + (1.f - lambda) * map1[offset + sizeX2 + 1], // bottom right
|
||
|
|
lambda * map2[offset + sizeX2 ] + (1.f - lambda) * map1[offset + sizeX2 ], // bottom left
|
||
|
|
deltaU,
|
||
|
|
deltaV
|
||
|
|
);
|
||
|
|
}
|
||
|
|
else return 0;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
} // NL3D
|