mirror of
https://github.com/bulletphysics/bullet3
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107 lines
2.1 KiB
C++
107 lines
2.1 KiB
C++
#ifndef DOUBLE_BUFFER_H
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#define DOUBLE_BUFFER_H
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#include "SpuFakeDma.h"
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///DoubleBuffer
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template<class T, int size>
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class DoubleBuffer
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{
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#ifdef __CELLOS_LV2__
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T m_buffer0[size] __attribute__ ((aligned (128)));
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T m_buffer1[size] __attribute__ ((aligned (128)));
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#else
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T m_buffer0[size];
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T m_buffer1[size];
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#endif
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T *m_frontBuffer;
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T *m_backBuffer;
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unsigned int m_dmaTag;
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bool m_dmaPending;
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public:
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bool isPending() const { return m_dmaPending;}
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DoubleBuffer();
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void init ();
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// dma get and put commands
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void backBufferDmaGet(uint64_t ea, unsigned int numBytes, unsigned int tag);
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void backBufferDmaPut(uint64_t ea, unsigned int numBytes, unsigned int tag);
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// gets pointer to a buffer
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T *getFront();
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T *getBack();
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// if back buffer dma was started, wait for it to complete
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// then move back to front and vice versa
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T *swapBuffers();
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};
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template<class T, int size>
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DoubleBuffer<T,size>::DoubleBuffer()
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{
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init ();
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}
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template<class T, int size>
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void DoubleBuffer<T,size>::init()
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{
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this->m_dmaPending = false;
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this->m_frontBuffer = &this->m_buffer0[0];
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this->m_backBuffer = &this->m_buffer1[0];
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}
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template<class T, int size>
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void
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DoubleBuffer<T,size>::backBufferDmaGet(uint64_t ea, unsigned int numBytes, unsigned int tag)
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{
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m_dmaPending = true;
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m_dmaTag = tag;
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cellDmaLargeGet(m_backBuffer, ea, numBytes, tag, 0, 0);
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}
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template<class T, int size>
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void
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DoubleBuffer<T,size>::backBufferDmaPut(uint64_t ea, unsigned int numBytes, unsigned int tag)
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{
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m_dmaPending = true;
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m_dmaTag = tag;
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cellDmaLargePut(m_backBuffer, ea, numBytes, tag, 0, 0);
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}
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template<class T, int size>
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T *
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DoubleBuffer<T,size>::getFront()
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{
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return m_frontBuffer;
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}
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template<class T, int size>
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T *
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DoubleBuffer<T,size>::getBack()
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{
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return m_backBuffer;
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}
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template<class T, int size>
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T *
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DoubleBuffer<T,size>::swapBuffers()
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{
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if (m_dmaPending)
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{
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cellDmaWaitTagStatusAll(1<<m_dmaTag);
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m_dmaPending = false;
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}
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T *tmp = m_backBuffer;
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m_backBuffer = m_frontBuffer;
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m_frontBuffer = tmp;
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return m_frontBuffer;
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}
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#endif
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