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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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#ifndef OPENCV_DNN_SRC_CUDA_BLOCK_STRIDE_RANGE_HPP
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#define OPENCV_DNN_SRC_CUDA_BLOCK_STRIDE_RANGE_HPP
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#include "types.hpp"
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#include "index_helpers.hpp"
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#include <cuda_runtime.h>
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namespace cv { namespace dnn { namespace cuda4dnn { namespace csl { namespace device {
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template <int dim, int BLOCK_SIZE = 0, class index_type = device::index_type, class size_type = device::size_type>
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class block_stride_range_generic {
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public:
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__device__ block_stride_range_generic(index_type to_) : from(0), to(to_) { }
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__device__ block_stride_range_generic(index_type from_, index_type to_) : from(from_), to(to_) { }
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class iterator
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{
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public:
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__device__ iterator(index_type pos_) : pos(pos_) {}
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/* these iterators return the index when dereferenced; this allows us to loop
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* through the indices using a range based for loop
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*/
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__device__ index_type operator*() const { return pos; }
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__device__ iterator& operator++() {
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const index_type block_size = BLOCK_SIZE == 0 ? getBlockDim<dim>() : BLOCK_SIZE;
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pos += block_size;
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return *this;
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}
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__device__ bool operator!=(const iterator& other) const {
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/* NOTE HACK
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* 'pos' can move in large steps (see operator++)
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* expansion of range for loop uses != as the loop conditioion
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* => operator!= must return false if 'pos' crosses the end
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*/
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return pos < other.pos;
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}
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private:
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index_type pos;
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};
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__device__ iterator begin() const {
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return iterator(from + getThreadIdx<dim>());
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}
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__device__ iterator end() const {
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return iterator(to);
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}
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private:
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index_type from, to;
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};
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using block_stride_range_x = block_stride_range_generic<0>;
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using block_stride_range_y = block_stride_range_generic<1>;
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using block_stride_range_z = block_stride_range_generic<2>;
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template <size_type BLOCK_SIZE = 0>
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using block_stride_range = block_stride_range_generic<0, BLOCK_SIZE>;
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}}}}} /* namespace cv::dnn::cuda4dnn::csl::device */
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#endif /* OPENCV_DNN_SRC_CUDA_BLOCK_STRIDE_RANGE_HPP */
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