59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
/*
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Crafter®.Asset
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Copyright (C) 2026 Catcrafts®
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catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 3.0 as published by the Free Software Foundation;
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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export module Crafter.Asset:Compression;
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import std;
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export namespace Crafter::Compression {
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// One independently-decompressable GDeflate stream inside CompressedBlob::bytes.
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// Layout matches what VK_EXT_memory_decompression's VkDecompressMemoryRegionEXT
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// expects, minus the device addresses (which the consumer fills in).
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struct RegionMeta {
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std::uint64_t srcOffset;
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std::uint64_t compressedSize;
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std::uint64_t decompressedSize;
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};
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struct CompressedBlob {
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std::vector<std::byte> bytes;
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std::vector<RegionMeta> regions;
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std::uint64_t TotalDecompressedSize() const noexcept {
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std::uint64_t sum = 0;
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for (const RegionMeta& r : regions) sum += r.decompressedSize;
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return sum;
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}
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};
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// Compresses each input span as its own GDeflate tile-stream; concatenates
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// them into one byte buffer with a parallel region table. Streams are
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// independent and can be addressed individually by VkDecompressMemoryRegionEXT
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// entries on the GPU path.
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CompressedBlob CompressStreams(std::span<const std::span<const std::byte>> streams);
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// CPU fallback decoder. outputs.size() must equal blob.regions.size();
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// outputs[i].size() must equal blob.regions[i].decompressedSize.
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void DecompressCPU(const CompressedBlob& blob, std::span<const std::span<std::byte>> outputs);
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// Length-prefixed serialization of a CompressedBlob. Used by per-asset
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// SaveCompressed/LoadCompressed implementations after they've written
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// their own type-specific header.
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void WriteBlob(std::ostream& file, const CompressedBlob& blob);
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CompressedBlob ReadBlob(std::istream& file);
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}
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