67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
// Copyright (C) 2020 Jérôme Leclercq
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// This file is part of the "Nazara Engine - OpenGL Renderer"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/OpenGLRenderer/OpenGLUploadPool.hpp>
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#include <cassert>
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#include <stdexcept>
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#include <Nazara/OpenGLRenderer/Debug.hpp>
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namespace Nz
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{
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auto OpenGLUploadPool::Allocate(UInt64 size) -> Allocation&
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{
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return Allocate(size, 1); //< Alignment doesn't matter
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}
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auto OpenGLUploadPool::Allocate(UInt64 size, UInt64 /*alignment*/) -> Allocation&
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{
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assert(size <= m_blockSize);
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// Try to minimize lost space
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struct
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{
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Block* block = nullptr;
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UInt64 offset = 0;
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} bestBlock;
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for (Block& block : m_blocks)
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{
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UInt64 alignedOffset = block.freeOffset;
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if (block.freeOffset + size > m_blockSize)
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continue; //< Not enough space
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if (!bestBlock.block)
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{
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bestBlock.block = █
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bestBlock.offset = block.freeOffset;
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break; //< Since we have no alignment constraint, the first block is good
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}
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}
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// No block found, allocate a new one
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if (!bestBlock.block)
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{
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Block newBlock;
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newBlock.memory.resize(m_blockSize);
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bestBlock.block = &m_blocks.emplace_back(std::move(newBlock));
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bestBlock.offset = 0;
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}
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Allocation& allocationData = m_allocations.emplace_back();
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allocationData.mappedPtr = static_cast<UInt8*>(bestBlock.block->memory.data()) + bestBlock.offset;
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allocationData.size = size;
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return allocationData;
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}
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void OpenGLUploadPool::Reset()
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{
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for (Block& block : m_blocks)
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block.freeOffset = 0;
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m_allocations.clear();
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}
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}
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