Danny Robson
c2265b9ed2
sometimes we need to ensure memory allocation has a particular alignment in an _offset_ buffer (which we have no control over, eg renderdoc's OpenGL buffers). this applies an offset to various operations that make the aligned::direct allocator correctly align allocations for buffers that aren't themselves aligned.
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
/*
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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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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_ALLOC_RAW_ALIGNED_DIRECT_HPP
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#define CRUFT_UTIL_ALLOC_RAW_ALIGNED_DIRECT_HPP
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#include "../../../debug.hpp"
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#include <cstddef>
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#include <utility>
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namespace util::alloc::raw::aligned {
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/// wraps a child allocator and enforces a fixed alignment
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template <typename ChildT>
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class direct {
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public:
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///////////////////////////////////////////////////////////////////////
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template <typename ...Args>
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direct (util::view<std::byte*> _data, std::size_t _alignment, Args &&...args):
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m_successor (_data, std::forward<Args> (args)...),
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m_alignment (_alignment)
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{ ; }
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///////////////////////////////////////////////////////////////////////
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auto
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allocate (std::size_t bytes)
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{
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return m_successor.allocate (bytes, m_alignment);
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}
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//---------------------------------------------------------------------
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auto
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deallocate (void *ptr, std::size_t bytes)
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{
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return m_successor.deallocate (ptr, bytes);
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}
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///////////////////////////////////////////////////////////////////////
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constexpr auto alignment (void) const noexcept { return m_alignment; }
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///////////////////////////////////////////////////////////////////////
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auto data (void) { return m_successor.data (); }
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//---------------------------------------------------------------------
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auto begin (void) { return m_successor.begin (); }
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auto begin (void) const { return m_successor.begin (); }
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auto end (void) { return m_successor.end (); }
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auto end (void) const { return m_successor.end (); }
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//---------------------------------------------------------------------
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auto
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offset (const void *ptr) const
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{
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return m_successor.offset (ptr);
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}
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///////////////////////////////////////////////////////////////////////
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auto reset (void) { return m_successor.reset (); }
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///////////////////////////////////////////////////////////////////////
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auto capacity (void) const { return m_successor.capacity (); }
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auto used (void) const { return m_successor.used (); }
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auto remain (void) const { return m_successor.remain (); }
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private:
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ChildT m_successor;
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std::size_t m_alignment;
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};
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}
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#endif
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