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| author | Jason Maskell <[email protected]> | 2016-05-09 10:39:54 +0200 |
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| committer | Jason Maskell <[email protected]> | 2016-05-09 10:39:54 +0200 |
| commit | 79b3462799c28af8ba586349bd671b1b56e72353 (patch) | |
| tree | 3b06e36c390254c0dc7f3733a0d32af213d87293 /src/CircularFIFO.h | |
| download | waveworks_archive-79b3462799c28af8ba586349bd671b1b56e72353.tar.xz waveworks_archive-79b3462799c28af8ba586349bd671b1b56e72353.zip | |
Initial commit with PS4 and XBone stuff trimmed.
Diffstat (limited to 'src/CircularFIFO.h')
| -rw-r--r-- | src/CircularFIFO.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/CircularFIFO.h b/src/CircularFIFO.h new file mode 100644 index 0000000..4f2c72f --- /dev/null +++ b/src/CircularFIFO.h @@ -0,0 +1,95 @@ +// This code contains NVIDIA Confidential Information and is disclosed +// under the Mutual Non-Disclosure Agreement. +// +// Notice +// ALL NVIDIA DESIGN SPECIFICATIONS AND CODE ("MATERIALS") ARE PROVIDED "AS IS" NVIDIA MAKES +// NO REPRESENTATIONS, WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO +// THE MATERIALS, AND EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTIES OF NONINFRINGEMENT, +// MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. +// +// NVIDIA Corporation assumes no responsibility for the consequences of use of such +// information or for any infringement of patents or other rights of third parties that may +// result from its use. No license is granted by implication or otherwise under any patent +// or patent rights of NVIDIA Corporation. No third party distribution is allowed unless +// expressly authorized by NVIDIA. Details are subject to change without notice. +// This code supersedes and replaces all information previously supplied. +// NVIDIA Corporation products are not authorized for use as critical +// components in life support devices or systems without express written approval of +// NVIDIA Corporation. +// +// Copyright � 2008- 2013 NVIDIA Corporation. All rights reserved. +// +// NVIDIA Corporation and its licensors retain all intellectual property and proprietary +// rights in and to this software and related documentation and any modifications thereto. +// Any use, reproduction, disclosure or distribution of this software and related +// documentation without an express license agreement from NVIDIA Corporation is +// strictly prohibited. +// + +#ifndef _CIRCULAR_FIFO_H +#define _CIRCULAR_FIFO_H + +/*=========================================================================== + A template class to handle a fixed-maximum-size circular FIFO + ===========================================================================*/ +template<class T> +class CircularFIFO +{ +public: + CircularFIFO(int capacity) : + m_ptr(new T [capacity]), + m_capacity(capacity), + m_range_begin_index(0), + m_range_count(0) + { + memset(m_ptr,0,m_capacity*sizeof(T)); + } + + ~CircularFIFO() + { + delete [] m_ptr; + } + + int capacity() const { return m_capacity; } + int range_count() const { return m_range_count; } + + T& raw_at(int ix) + { + assert(ix < m_capacity); + return m_ptr[ix]; + } + + // NB: ix = 0 means 'most-recently-added', hence the reverse indexing... + T& range_at(int ix) + { + assert(ix < m_range_count); + return m_ptr[(m_range_begin_index+m_range_count-ix-1)%m_capacity]; + } + + // Recycles the oldest entry in the FIFO if necessary + T& consume_one() + { + assert(m_capacity > 0); + + if(m_capacity == m_range_count) + { + // The FIFO is full, so free up the oldest entry + m_range_begin_index = (m_range_begin_index+1) % m_capacity; + --m_range_count; + } + + const int raw_result_index = (m_range_begin_index+m_range_count) % m_capacity; + ++m_range_count; + + return m_ptr[raw_result_index]; + } + +private: + + T* m_ptr; + int m_capacity; + int m_range_begin_index; + int m_range_count; +}; + +#endif // _CIRCULAR_FIFO_H |