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#ifndef DOUBLE_BUFFER_H
#define DOUBLE_BUFFER_H
#include "SpuFakeDma.h"
#include "LinearMath/btScalar.h"
///DoubleBuffer
template<class T, int size>
class DoubleBuffer
{
#if defined(__SPU__) || defined(USE_LIBSPE2)
ATTRIBUTE_ALIGNED128( T m_buffer0[size] ) ;
ATTRIBUTE_ALIGNED128( T m_buffer1[size] ) ;
#else
T m_buffer0[size];
T m_buffer1[size];
#endif
T *m_frontBuffer;
T *m_backBuffer;
unsigned int m_dmaTag;
bool m_dmaPending;
public:
bool isPending() const { return m_dmaPending;}
DoubleBuffer();
void init ();
// dma get and put commands
void backBufferDmaGet(uint64_t ea, unsigned int numBytes, unsigned int tag);
void backBufferDmaPut(uint64_t ea, unsigned int numBytes, unsigned int tag);
// gets pointer to a buffer
T *getFront();
T *getBack();
// if back buffer dma was started, wait for it to complete
// then move back to front and vice versa
T *swapBuffers();
};
template<class T, int size>
DoubleBuffer<T,size>::DoubleBuffer()
{
init ();
}
template<class T, int size>
void DoubleBuffer<T,size>::init()
{
this->m_dmaPending = false;
this->m_frontBuffer = &this->m_buffer0[0];
this->m_backBuffer = &this->m_buffer1[0];
}
template<class T, int size>
void
DoubleBuffer<T,size>::backBufferDmaGet(uint64_t ea, unsigned int numBytes, unsigned int tag)
{
m_dmaPending = true;
m_dmaTag = tag;
if (numBytes)
{
m_backBuffer = (T*)cellDmaLargeGetReadOnly(m_backBuffer, ea, numBytes, tag, 0, 0);
}
}
template<class T, int size>
void
DoubleBuffer<T,size>::backBufferDmaPut(uint64_t ea, unsigned int numBytes, unsigned int tag)
{
m_dmaPending = true;
m_dmaTag = tag;
cellDmaLargePut(m_backBuffer, ea, numBytes, tag, 0, 0);
}
template<class T, int size>
T *
DoubleBuffer<T,size>::getFront()
{
return m_frontBuffer;
}
template<class T, int size>
T *
DoubleBuffer<T,size>::getBack()
{
return m_backBuffer;
}
template<class T, int size>
T *
DoubleBuffer<T,size>::swapBuffers()
{
if (m_dmaPending)
{
cellDmaWaitTagStatusAll(1<<m_dmaTag);
m_dmaPending = false;
}
T *tmp = m_backBuffer;
m_backBuffer = m_frontBuffer;
m_frontBuffer = tmp;
return m_frontBuffer;
}
#endif
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