129 lines
4.6 KiB
C++
Executable File
129 lines
4.6 KiB
C++
Executable File
// ======================================================================== //
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// Copyright 2009-2014 Intel Corporation //
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// //
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// Licensed under the Apache License, Version 2.0 (the "License"); //
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// you may not use this file except in compliance with the License. //
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// You may obtain a copy of the License at //
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// //
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// http://www.apache.org/licenses/LICENSE-2.0 //
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// //
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// Unless required by applicable law or agreed to in writing, software //
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// distributed under the License is distributed on an "AS IS" BASIS, //
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
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// See the License for the specific language governing permissions and //
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// limitations under the License. //
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// ======================================================================== //
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#pragma once
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#include "common/default.h"
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#include "common/buffer.h"
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#include "algorithms/sort.h"
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#include "algorithms/parallel_for.h"
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namespace embree
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{
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/*! implementation of a map key/value map with parallel construction */
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template<typename Key, typename Val>
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class pmap
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{
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struct KeyValue
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{
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__forceinline KeyValue () {}
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__forceinline KeyValue (const Key key, const Val val)
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: key(key), val(val) {}
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__forceinline operator Key() const {
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return key;
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}
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public:
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Key key;
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Val val;
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};
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public:
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/*! parallel map constructors */
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pmap () {}
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template<typename SourceKey>
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pmap (const std::vector<SourceKey>& keys, const std::vector<Val>& values) { init(keys,values); }
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template<typename SourceKey>
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pmap (const BufferT<SourceKey>& keys, const BufferT<Val>& values) { init(keys,values); }
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/*! initialized the parallel map from a vector with keys and values */
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template<typename SourceKey>
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void init(const std::vector<SourceKey>& keys, const std::vector<Val>& values)
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{
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/* reserve sufficient space for all data */
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assert(keys.size() == values.size());
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vec.resize(keys.size());
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temp.resize(keys.size());
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/* generate key/value pairs */
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parallel_for( size_t(0), keys.size(), size_t(4*4096), [&](const range<size_t>& r) {
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for (size_t i=r.begin(); i<r.end(); i++)
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vec[i] = KeyValue((Key)keys[i],values[i]);
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});
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/* perform parallel radix sort of the key/value pairs */
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radix_sort<KeyValue,Key>(vec.data(),temp.data(),keys.size());
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}
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/*! initialized the parallel map from user buffers with keys and values */
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template<typename SourceKey>
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void init(const BufferT<SourceKey>& keys, const BufferT<Val>& values)
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{
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/* reserve sufficient space for all data */
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assert(keys.size() == values.size());
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vec.resize(keys.size());
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temp.resize(keys.size());
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/* generate key/value pairs */
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parallel_for( size_t(0), keys.size(), size_t(4*4096), [&](const range<size_t>& r) {
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for (size_t i=r.begin(); i<r.end(); i++)
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vec[i] = KeyValue((Key)keys[i],values[i]);
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});
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/* perform parallel radix sort of the key/value pairs */
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radix_sort<KeyValue,Key>(vec.data(),temp.data(),keys.size());
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}
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/*! Returns a pointer to the value associated with the specified key. The pointer will be NULL of the key is not contained in the map. */
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__forceinline const Val* lookup(const Key& key) const
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{
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typename std::vector<KeyValue>::const_iterator i = std::lower_bound(vec.begin(), vec.end(), key);
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if (i == vec.end()) return NULL;
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if (i->key != key) return NULL;
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return &i->val;
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}
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/*! If the key is in the map, the function returns the value associated with the key, otherwise it returns the default value. */
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__forceinline Val lookup(const Key& key, const Val& def) const
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{
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typename std::vector<KeyValue>::const_iterator i = std::lower_bound(vec.begin(), vec.end(), key);
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if (i == vec.end()) return def;
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if (i->key != key) return def;
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return i->val;
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}
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/*! cleans temporary state required for re-construction */
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void cleanup() {
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temp.clear();
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}
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/*! clears all state */
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void clear() {
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vec.clear();
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temp.clear();
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}
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private:
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std::vector<KeyValue> vec; //!< vector containing sorted elements
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std::vector<KeyValue> temp; //!< temporary vector required during construction only
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};
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}
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