307 lines
9.8 KiB
Plaintext
307 lines
9.8 KiB
Plaintext
//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_ALGORITHM_FILL_HPP
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#define BOOST_COMPUTE_ALGORITHM_FILL_HPP
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#include <iterator>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/mpl/contains.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/compute/cl.hpp>
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#include <boost/compute/system.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/copy.hpp>
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#include <boost/compute/async/future.hpp>
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#include <boost/compute/iterator/constant_iterator.hpp>
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#include <boost/compute/iterator/discard_iterator.hpp>
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#include <boost/compute/detail/is_buffer_iterator.hpp>
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#include <boost/compute/detail/iterator_range_size.hpp>
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namespace boost {
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namespace compute {
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namespace detail {
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namespace mpl = boost::mpl;
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// fills the range [first, first + count) with value using copy()
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template<class BufferIterator, class T>
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inline void fill_with_copy(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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::boost::compute::copy(
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::boost::compute::make_constant_iterator(value, 0),
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::boost::compute::make_constant_iterator(value, count),
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first,
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queue
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);
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}
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// fills the range [first, first + count) with value using copy_async()
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template<class BufferIterator, class T>
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inline future<void> fill_async_with_copy(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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return ::boost::compute::copy_async(
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::boost::compute::make_constant_iterator(value, 0),
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::boost::compute::make_constant_iterator(value, count),
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first,
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queue
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);
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}
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#if defined(CL_VERSION_1_2)
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// meta-function returing true if Iterator points to a range of values
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// that can be filled using clEnqueueFillBuffer(). to meet this criteria
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// it must have a buffer accessible through iter.get_buffer() and the
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// size of its value_type must by in {1, 2, 4, 8, 16, 32, 64, 128}.
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template<class Iterator>
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struct is_valid_fill_buffer_iterator :
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public mpl::and_<
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is_buffer_iterator<Iterator>,
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mpl::contains<
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mpl::vector<
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mpl::int_<1>,
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mpl::int_<2>,
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mpl::int_<4>,
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mpl::int_<8>,
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mpl::int_<16>,
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mpl::int_<32>,
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mpl::int_<64>,
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mpl::int_<128>
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>,
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mpl::int_<
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sizeof(typename std::iterator_traits<Iterator>::value_type)
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>
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>
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>::type { };
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template<>
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struct is_valid_fill_buffer_iterator<discard_iterator> : public boost::false_type {};
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// specialization which uses clEnqueueFillBuffer for buffer iterators
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template<class BufferIterator, class T>
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inline void
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dispatch_fill(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue,
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typename boost::enable_if<
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is_valid_fill_buffer_iterator<BufferIterator>
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>::type* = 0)
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{
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typedef typename std::iterator_traits<BufferIterator>::value_type value_type;
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if(count == 0){
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// nothing to do
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return;
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}
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// check if the device supports OpenCL 1.2 (required for enqueue_fill_buffer)
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if(!queue.check_device_version(1, 2)){
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return fill_with_copy(first, count, value, queue);
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}
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value_type pattern = static_cast<value_type>(value);
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size_t offset = static_cast<size_t>(first.get_index());
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if(count == 1){
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// use clEnqueueWriteBuffer() directly when writing a single value
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// to the device buffer. this is potentially more efficient and also
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// works around a bug in the intel opencl driver.
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queue.enqueue_write_buffer(
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first.get_buffer(),
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offset * sizeof(value_type),
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sizeof(value_type),
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&pattern
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);
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}
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else {
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queue.enqueue_fill_buffer(
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first.get_buffer(),
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&pattern,
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sizeof(value_type),
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offset * sizeof(value_type),
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count * sizeof(value_type)
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);
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}
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}
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template<class BufferIterator, class T>
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inline future<void>
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dispatch_fill_async(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue,
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typename boost::enable_if<
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is_valid_fill_buffer_iterator<BufferIterator>
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>::type* = 0)
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{
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typedef typename std::iterator_traits<BufferIterator>::value_type value_type;
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// check if the device supports OpenCL 1.2 (required for enqueue_fill_buffer)
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if(!queue.check_device_version(1, 2)){
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return fill_async_with_copy(first, count, value, queue);
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}
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value_type pattern = static_cast<value_type>(value);
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size_t offset = static_cast<size_t>(first.get_index());
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event event_ =
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queue.enqueue_fill_buffer(first.get_buffer(),
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&pattern,
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sizeof(value_type),
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offset * sizeof(value_type),
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count * sizeof(value_type));
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return future<void>(event_);
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}
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#ifdef CL_VERSION_2_0
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// specializations for svm_ptr<T>
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template<class T>
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inline void dispatch_fill(svm_ptr<T> first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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if(count == 0){
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return;
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}
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queue.enqueue_svm_fill(
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first.get(), &value, sizeof(T), count * sizeof(T)
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);
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}
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template<class T>
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inline future<void> dispatch_fill_async(svm_ptr<T> first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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if(count == 0){
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return future<void>();
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}
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event event_ = queue.enqueue_svm_fill(
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first.get(), &value, sizeof(T), count * sizeof(T)
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);
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return future<void>(event_);
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}
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#endif // CL_VERSION_2_0
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// default implementations
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template<class BufferIterator, class T>
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inline void
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dispatch_fill(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue,
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typename boost::disable_if<
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is_valid_fill_buffer_iterator<BufferIterator>
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>::type* = 0)
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{
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fill_with_copy(first, count, value, queue);
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}
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template<class BufferIterator, class T>
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inline future<void>
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dispatch_fill_async(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue,
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typename boost::disable_if<
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is_valid_fill_buffer_iterator<BufferIterator>
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>::type* = 0)
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{
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return fill_async_with_copy(first, count, value, queue);
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}
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#else
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template<class BufferIterator, class T>
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inline void dispatch_fill(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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fill_with_copy(first, count, value, queue);
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}
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template<class BufferIterator, class T>
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inline future<void> dispatch_fill_async(BufferIterator first,
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size_t count,
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const T &value,
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command_queue &queue)
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{
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return fill_async_with_copy(first, count, value, queue);
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}
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#endif // !defined(CL_VERSION_1_2)
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} // end detail namespace
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/// Fills the range [\p first, \p last) with \p value.
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///
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/// \param first first element in the range to fill
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/// \param last last element in the range to fill
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/// \param value value to copy to each element
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/// \param queue command queue to perform the operation
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///
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/// For example, to fill a vector on the device with sevens:
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/// \code
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/// // vector on the device
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/// boost::compute::vector<int> vec(10, context);
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///
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/// // fill vector with sevens
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/// boost::compute::fill(vec.begin(), vec.end(), 7, queue);
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/// \endcode
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///
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/// \see boost::compute::fill_n()
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template<class BufferIterator, class T>
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inline void fill(BufferIterator first,
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BufferIterator last,
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const T &value,
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command_queue &queue = system::default_queue())
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{
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size_t count = detail::iterator_range_size(first, last);
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if(count == 0){
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return;
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}
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detail::dispatch_fill(first, count, value, queue);
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}
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template<class BufferIterator, class T>
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inline future<void> fill_async(BufferIterator first,
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BufferIterator last,
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const T &value,
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command_queue &queue = system::default_queue())
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{
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size_t count = detail::iterator_range_size(first, last);
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if(count == 0){
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return future<void>();
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}
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return detail::dispatch_fill_async(first, count, value, queue);
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_FILL_HPP
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