halflife-sdk-steam/public/pman_particlemem.h

#ifndef PARTICLEMEM_H__
#define PARTICLEMEM_H__

#ifdef _WIN32
#pragma once
#endif

#include <vector>

class CCoreTriangleEffect;

#define TRIANGLE_FPS 30

typedef struct visibleparticles_s
{
	CCoreTriangleEffect *pVisibleParticle;
} visibleparticles_t;

//---------------------------------------------------------------------------
// Memory block record.
class MemoryBlock
{
private:
    char *m_pData;
    //bool m_bBlockIsInUse;
public:
    MemoryBlock(long lBlockSize)
    : next(NULL), prev(NULL)
      //m_bBlockIsInUse(false) // Initialize block to 'free' state.
    {
        // Allocate memory here.
        m_pData = new char[lBlockSize];
    }

    virtual ~MemoryBlock()
    {
        // Free memory.
        delete[] m_pData;
    }
  
    inline char *Memory(void) { return m_pData; }

	MemoryBlock * next;
	MemoryBlock * prev;
};

class MemList
{
public:
	MemList() : m_pHead(NULL) {}

	~MemList() { Reset(); }

	void Push(MemoryBlock * newItem)
	{
		if(!m_pHead)
		{
			m_pHead = newItem;
			newItem->next = NULL;
			newItem->prev = NULL;
			return;
		}

		MemoryBlock * temp = m_pHead;
		m_pHead = newItem;
		m_pHead->next = temp;
		m_pHead->prev = NULL;
		
		temp->prev = m_pHead;
	}
	
	
	MemoryBlock * Front( void )
	{
		return(m_pHead);
	}

	MemoryBlock * Pop( void )
	{
		if(!m_pHead)
			return(NULL);

		MemoryBlock * temp = m_pHead;

		m_pHead = m_pHead->next;

		if(m_pHead)
			m_pHead->prev = NULL;

		temp->next = NULL;
		temp->prev = NULL;

		return(temp);
	}

	void Delete( MemoryBlock * pItem)
	{

		if(m_pHead == pItem)
		{
			MemoryBlock * temp = m_pHead;

			m_pHead = m_pHead->next;
			if(m_pHead)
				m_pHead->prev = NULL;

			temp->next = NULL;
			temp->prev = NULL;
			return;
		}

		MemoryBlock * prev = pItem->prev;
		MemoryBlock * next = pItem->next;

		if(prev)
			prev->next = next;
		
		if(next)
			next->prev = prev;

		pItem->next = NULL;
		pItem->prev = NULL;
	}

	void Reset( void )
	{
		while(m_pHead)
			Delete(m_pHead);
	}

private:
	MemoryBlock * m_pHead;
};


// Some helpful typedefs.
typedef std::vector<MemoryBlock *> VectorOfMemoryBlocks;
typedef VectorOfMemoryBlocks::iterator MemoryBlockIterator;

// Mini memory manager - singleton.
class CMiniMem
{
private:
    // Main memory pool.  Array is fine, but vectors are
    //  easier. :)
    static VectorOfMemoryBlocks m_vecMemoryPool;
    // Size of memory blocks in pool.
    static long m_lMemoryBlockSize;
    static long m_lMaxBlocks;
    static long m_lMemoryPoolSize;
    static CMiniMem *_instance;

	int m_iTotalParticles;
    int m_iParticlesDrawn;

protected:
    // private constructor and destructor.
    CMiniMem(long lMemoryPoolSize, long lMaxBlockSize);
    virtual ~CMiniMem();

    // ------------ Memory pool manager calls.
    // Find a free block and mark it as "in use".  Return NULL
    //  if no free blocks found.
    char *AllocateFreeBlock(void);
public:

    // Return a pointer to usable block of memory.
    char *newBlock(void);

    // Mark a target memory item as no longer "in use".
    void deleteBlock(MemoryBlock *p);

    // Return the remaining capacity of the memory pool as a percent.
    long PercentUsed(void);

	void ProcessAll( void ); //Processes all

	void Reset( void ); //clears memory, setting all particles to not used.

	static int ApplyForce( Vector vOrigin, Vector vDirection, float flRadius, float flStrength );

    static CMiniMem *Instance(void);
    static long MaxBlockSize(void);

	bool CheckSize( int iSize );

	int GetTotalParticles( void ) { return m_iTotalParticles;	}
	int GetDrawnParticles( void ) { return m_iParticlesDrawn;	}
	void IncreaseParticlesDrawn( void ){ m_iParticlesDrawn++;	}
	
	void Shutdown( void );
	
	visibleparticles_t *m_pVisibleParticles;
};


#endif//PARTICLEMEM_H__