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101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
/*
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** Render memory allocation
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** Copyright (c) 2016-2020 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#include <stdlib.h>
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#include "templates.h"
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#include "r_memory.h"
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#include <stdlib.h>
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void *RenderMemory::AllocBytes(int size)
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{
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size = (size + 15) / 16 * 16; // 16-byte align
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if (UsedBlocks.empty() || UsedBlocks.back()->Position + size > BlockSize)
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{
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if (!FreeBlocks.empty())
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{
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auto block = std::move(FreeBlocks.back());
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block->Position = 0;
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FreeBlocks.pop_back();
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UsedBlocks.push_back(std::move(block));
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}
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else
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{
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UsedBlocks.push_back(std::unique_ptr<MemoryBlock>(new MemoryBlock()));
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}
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}
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auto &block = UsedBlocks.back();
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void *data = block->Data + block->Position;
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block->Position += size;
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return data;
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}
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void RenderMemory::Clear()
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{
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while (!UsedBlocks.empty())
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{
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auto block = std::move(UsedBlocks.back());
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UsedBlocks.pop_back();
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FreeBlocks.push_back(std::move(block));
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}
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}
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static void* Aligned_Alloc(size_t alignment, size_t size)
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{
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void* ptr;
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#if defined (_MSC_VER) || defined (__MINGW32__)
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ptr = _aligned_malloc(size, alignment);
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if (!ptr)
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throw std::bad_alloc();
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#else
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// posix_memalign required alignment to be a min of sizeof(void *)
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if (alignment < sizeof(void*))
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alignment = sizeof(void*);
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if (posix_memalign((void**)&ptr, alignment, size))
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throw std::bad_alloc();
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#endif
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return ptr;
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}
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static void Aligned_Free(void* ptr)
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{
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if (ptr)
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{
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#if defined _MSC_VER
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_aligned_free(ptr);
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#else
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free(ptr);
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#endif
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}
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}
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RenderMemory::MemoryBlock::MemoryBlock() : Data(static_cast<uint8_t*>(Aligned_Alloc(16, BlockSize))), Position(0)
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{
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}
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RenderMemory::MemoryBlock::~MemoryBlock()
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{
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Aligned_Free(Data);
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}
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