Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifndef HARDWAREMATRIXSTATE_H
#define HARDWAREMATRIXSTATE_H
#pragma once
// This emulates the hardware matrix palette and keeps up with
// matrix usage, LRU's matrices, etc.
class CHardwareMatrixState
{
public:
CHardwareMatrixState();
void Init( int numHardwareMatrices );
// return false if there is no slot for this matrix.
bool AllocateMatrix( int globalMatrixID );
// deallocate the least recently used matrix
void DeallocateLRU( void );
void DeallocateLRU( int n );
// return true if a matrix is allocate.
bool IsMatrixAllocated( int globalMatrixID ) const;
// flush usage flags - signifies that none of the matrices are being used in the current strip
// do this when starting a new strip.
void SetAllUnused();
void DeallocateAll();
// save the complete state of the hardware matrices
void SaveState();
// restore the complete state of the hardware matrices
void RestoreState();
// Returns the number of free + unsed matrices
int AllocatedMatrixCount() const;
int FreeMatrixCount() const;
int GetNthBoneGlobalID( int n ) const;
void DumpState( void );
private:
int FindHardwareMatrix( int globalMatrixID );
int FindLocalLRUIndex( void );
// Increment and return LRU counter.
struct MatrixState_t
{
bool allocated;
int lastUsageID;
int globalMatrixID;
};
int m_LRUCounter;
int m_NumMatrices;
int m_AllocatedMatrices;
MatrixState_t *m_matrixState;
MatrixState_t *m_savedMatrixState;
};
#endif // HARDWAREMATRIXSTATE_H