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79 lines
3 KiB
C++
79 lines
3 KiB
C++
// 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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#ifndef PS_MISC_H
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#define PS_MISC_H
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#include "nel/misc/types_nl.h"
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#include "nel/misc/vector.h"
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#include "nel/3d/particle_system_process.h"
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namespace NL3D {
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/** Find a quantity to add to a float f such as f + deltaT * numStep, be >= than a given float (endValue). numStep is an integer,.
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* It gives the number of steps used. If the number of steps is equal or greater than numStep, it is clamped to numStep
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* \param f the start value.
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* \return The number of steps.
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*/
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inline uint ScaleFloatGE(float f, float deltaT, float clampValue, uint numStep)
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{
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NL_PS_FUNC(ScaleFloatGE)
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if (f >= clampValue) return 0;
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float endValue = f + numStep * deltaT;
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if (endValue < clampValue) return numStep;
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const uint numAfterInitialDate = (uint) ((endValue - clampValue) / deltaT);
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return numStep - numAfterInitialDate;
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}
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/** Private function used to fill a buffer with the same value by using the given subdivision.
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* NumStep and startValue are modified to give the steps that are above or equal to clampValue.
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* \param value The value to fill the buffer with.
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* \param clampValue A float such as startValue + n * deltaT < clampValue, where n is the number of value to fill.
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* \param startValue The start value, used to get the number of steps, see clampValue.
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* \param deltaT The step between values
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* \param maxNumStep The max number of steps that can be filled. It is modified to
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* \param destPos The destination, that will be filled with the given value
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* \param stride Number of byte between each value to be copied
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*/
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inline NLMISC::CVector *FillBufUsingSubdiv(const NLMISC::CVector &value,
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float clampValue,
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float &startValue,
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float deltaT,
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uint &maxNumStep,
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NLMISC::CVector *destPos,
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uint32 stride
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)
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{
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NL_PS_FUNC(FillBufUsingSubdiv)
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uint numToFill = ScaleFloatGE(startValue, deltaT, clampValue, maxNumStep);
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nlassert(numToFill <= maxNumStep);
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startValue += numToFill * deltaT;
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maxNumStep -= numToFill;
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while (numToFill--)
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{
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*destPos = value;
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destPos = (NLMISC::CVector *) ( (uint8 *) destPos + stride);
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}
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return destPos;
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}
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} // NL3D
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#endif
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