ClothSheetSimulator.h

#pragma once
 
#include <Foundation/Containers/DynamicArray.h>
#include <Foundation/Math/Vec3.h>
#include <Foundation/SimdMath/SimdFloat.h>
#include <Foundation/SimdMath/SimdVec4f.h>
#include <Foundation/Time/Time.h>
#include <GameEngine/GameEngineDLL.h>
 
class PL_GAMEENGINE_DLL plClothSimulator
{
public:
  struct Node
  {
    bool m_bFixed = false;
    plSimdVec4f m_vPosition = plSimdVec4f::MakeZero();
    plSimdVec4f m_vPreviousPosition = plSimdVec4f::MakeZero();
  };
 
  plUInt8 m_uiWidth = 32;
 
  plUInt8 m_uiHeight = 32;
 
  plVec3 m_vAcceleration;
 
  float m_fDampingFactor = 0.995f;
 
  plVec2 m_vSegmentLength = plVec2(0.1f);
 
  plDynamicArray<Node, plAlignedAllocatorWrapper> m_Nodes;
 
  void SimulateCloth(const plTime& diff);
  void SimulateStep(const plSimdFloat fDiffSqr, plUInt32 uiMaxIterations, plSimdFloat fAllowedError);
  bool HasEquilibrium(plSimdFloat fAllowedMovement) const;
 
private:
  plSimdFloat EnforceDistanceConstraint();
  void UpdateNodePositions(const plSimdFloat tDiffSqr);
  plSimdVec4f MoveTowards(const plSimdVec4f posThis, const plSimdVec4f posNext, plSimdFloat factor, const plSimdVec4f fallbackDir, plSimdFloat& inout_fError, plSimdFloat fSegLen);
 
  plTime m_LeftOverTimeStep;
};