Leviathan/Client/Game/engine/Renderer/KPrimitiveFXParticle.h

#pragma	  once

#include "K3DTypes.h"
#include "KResource.h"
//#include <vector>
#include "KPrimitive.h"
#include "KSmartPtr.h"

class K3DRenderDevice;

const unsigned short c_Particle_Size = 2000;

class KCommonParticleIndexBuffer
{
private:
	WORD* m_pIdxBuffer;
	
	KCommonParticleIndexBuffer()
	{
		m_pIdxBuffer = new WORD[c_Particle_Size*6];
		for(int i = 0; i < c_Particle_Size; ++i)
		{
			m_pIdxBuffer[i*6+0] = (unsigned short)(i*4+2);
			m_pIdxBuffer[i*6+1] = (unsigned short)(i*4+1);
			m_pIdxBuffer[i*6+2] = (unsigned short)(i*4+0);
			m_pIdxBuffer[i*6+3] = (unsigned short)(i*4+1);
			m_pIdxBuffer[i*6+4] = (unsigned short)(i*4+2);
			m_pIdxBuffer[i*6+5] = (unsigned short)(i*4+3);
		}
	}
public:
	static KCommonParticleIndexBuffer& GetInstance();
	~KCommonParticleIndexBuffer()
	{
		SAFE_DELETE_ARRAY( m_pIdxBuffer );
	}
public:
	const WORD* GetCommonIndexbuffer( unsigned short nSize )
	{
		if( nSize < c_Particle_Size ) return m_pIdxBuffer;

		assert( false );
		return NULL;
	}
};

#define GetIndexbufferInstance() KCommonParticleIndexBuffer::GetInstance()


////////////////////////////////////////////////////////////////////////////////////////
/// KBillboardPrimitive
////////////////////////////////////////////////////////////////////////////////////////
class KBillboardPrimitive : public KPrimitive
{
public:
	KBillboardPrimitive()
	{
		m_bUseAdditiveRender = false;
	}
	void SetAdditiveRenderMode( bool bUseAdditive )
	{
		m_bUseAdditiveRender = bUseAdditive;
	}
	bool GetAdditiveRenderMode()
	{
		return m_bUseAdditiveRender;
	}
	virtual float GetDistance( const K3DVector &vCam ) = 0;

protected:
	bool m_bUseAdditiveRender;

};


////////////////////////////////////////////////////////////////////////////////////////
/// KFXBillboardPrimitive
////////////////////////////////////////////////////////////////////////////////////////
DECL_SPTR(KResFXBillboard)
class KFXBillboardPrimitive : public K3DPrimitive
{
public:
	KFXBillboardPrimitive();
	virtual ~KFXBillboardPrimitive();
	void SetBillboardRes( KResFXBillboard *res );
	KResFXBillboard *GetBillboardRes();
	void SetTransform( const K3DMatrix &transform );
	const K3DMatrix &GetTransform();

	void SetColor ( const KColor &color );
	const KColor &GetColor();

	void SetUV( float _l, float _t, float _r, float _b );
	void GetUV( float *_l, float *_t, float *_r, float *_b );
	void SetFixedAxis( int nAxis );
	void SetAngle( float fAngle );

	virtual void Render( KViewportObject *viewport, class K3DRenderDevice *dev, bool bUseAccum = true );

	virtual float GetDistance( const K3DVector &vCam )
	{
		return ( vCam - m_matTransform.GetPosVector() ).SquareMagnitude();
	}
protected:
	void _UpdateBillboard(KViewportObject* pViewport, K3DRenderDevice* pDev);
protected:
	static  int				s_nVertexStride;
	bool					m_bUseAdditiveRender;
	float					l,t,r,b;
	K3DMatrix				m_matTransform;
	KColor					m_colSprite;
	KResFXBillboardSPtr		m_spRes;
	K3DSPRITEVERTEX			m_VtxBuf[4];
	int						m_nFixedAxis;
	float					m_fAngle;
};


////////////////////////////////////////////////////////////////////////////////////////
/// KFXParticlePrimitive
////////////////////////////////////////////////////////////////////////////////////////

DECL_SPTR(KResFXParticle)
class KFXParticlePrimitive : public K3DPrimitive
{
public:
	KFXParticlePrimitive();
	virtual ~KFXParticlePrimitive();
	void ResetParticleCount();
	void SetParticleRes( KResFXParticle *res );
	KResFXParticle *GetParticleRes();
	/** 
		Set total number of particle.
		If old _PARTICLE array is exist, delete that array and reallocate memory according to count argument value.
	*/
	void SetParticleCount( int count );
	/**
		@param num Index of __PARTICLE array
		@param pos Particle's position.
		The m_nDrawParticleCount value is increased when this function is called.
	*/
	/// Set rendering source rectangle.
	void GetParticleUV( int num, float *_l, float *_t, float *_r, float *_b );

	///	This struct has each particle's position, color, width,height,source information.
	struct _PARTICLE
	{
		K3DVertex	pos;
		KColor		color;
		float		fWidth, fHeight;
		float		l, t, r, b;
		bool		newparticle;
		K3DMatrix	matParent;
		_PARTICLE() : newparticle(false) 
		{
			K3DMatrixIdentity( matParent );
		}
	};
	
	void SetParticleInfo( int num, _PARTICLE& particle );

	const _PARTICLE &GetParticle( int num );
	int GetMaxParticleCount();

	/// Get Drawable particle's count.
	int GetDrawParticleCount();

	/// Do not anything in this function!
	virtual void Render( KViewportObject *viewport, class K3DRenderDevice *dev, bool bUseAccum = true );
	virtual float GetDistance( const K3DVector &vCam )
	{
		if( m_nDrawParticleCount > 0 )
		{
			if( m_pParticles )
				return ( vCam - K3DVector(0,0, m_pParticles->pos.z) ).SquareMagnitude();
		}

		return 0.f;
	}
	void	NewParticle( int num );
	
	void	SetAttachParent( bool bAttachParent );
	bool	IsValidIndexBuffer() { return m_pIdxBuf == NULL ? false : true; }
protected:
	inline void _UpdateParticle(KViewportObject* pViewport, K3DRenderDevice* pDev);
protected:
	static  int				s_nVertexStride;
	int						m_nParticleCount;
	int						m_nDrawParticleCount;
	_PARTICLE*				m_pParticles;

	bool					m_bIsAttachParent;

	K3DSPRITEVERTEX*		m_pVtxBuf;
	const WORD*				m_pIdxBuf;
	KResFXParticleSPtr		m_spRes;
};

////////////////////////////////////////////////////////////////////////////////////////
// KFXAfterImagePrimitive
////////////////////////////////////////////////////////////////////////////////////////
/**
KFXAfterImagePrimitive Description.
- This class has two custom vertex's array which render afterimage.
- The render function do real-rendering action. ( render to device)
*/
class K3DTexture;
class KFXAfterImagePrimitive : public K3DPrimitive
{
public:
	KFXAfterImagePrimitive();	
	virtual ~KFXAfterImagePrimitive();

	void Clear();
	void SetTransform( const K3DMatrix &transform );
	void SetTexture( K3DTexture *pTex );
	/// Allocates new memorys to two custom vertex's array which size is determined by a nDepth value.
	void	Initialize ( int nDepth );

	void ReserveVtx(int nCount);
	void PopVertex(int nCount);
	void PushVertex( const K3DSPRITEVERTEX &vtx1, const K3DSPRITEVERTEX &vtx2);
	void UpdateVertex();
	void RemoveVertex();

	virtual void Render( KViewportObject *viewport, class K3DRenderDevice *dev, bool bUseAccum = true );

	void SetMoveAdded(const K3DVertex & vMoveAdded);
protected:
	int					m_nDepth;
	int					m_nDrawCount;
	int					m_nCurPos;
	int					m_nVertexStride;
	K3DSPRITEVERTEX*	m_pVtx;

	K3DTextureSPtr		m_spTex;
	K3DMatrix			m_Transform;
};