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58 lines
2.3 KiB
C++
58 lines
2.3 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <cstdint>
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#include <string>
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namespace scene
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{
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class basic_region;
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class basic_section;
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struct terrain_block;
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// binary terrain file (.btf): static geometry of a text terrain file (.txtf), arranged by the sections
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// of the scene so each can be loaded on its own, when it comes into use.
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// the binary file records length and checksum of the text it was made from, and is made anew when these don't match
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class terrain_file
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{
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public:
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// types
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// what a scenery is left with for a terrain file it refers to
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enum class state
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{
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binary, // binary file is in place and up to date
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text, // binary file can't be had, the text file has to be loaded the way any other scenery file is
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missing // there's nothing to load
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};
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// methods
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// calculates checksum (crc-32) of provided data
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static std::uint32_t checksum(char const *Data, std::size_t Size);
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// converts specified text terrain file to binary format. returns: true on success, false otherwise.
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// description of the result or of the failure is stored in Message, if provided
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static bool convert(std::string const &Textfile, std::string const &Binaryfile, std::string *Message = nullptr);
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// makes sure binary version of specified text terrain file is in place and matches the text
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static state prepare(std::string const &Textfile, std::string const &Binaryfile);
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// makes content of specified binary terrain file a part of provided region. the geometry is loaded right away,
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// or left for the sections of the region to load when they're about to be used. returns: true on success, false otherwise
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static bool attach(std::string const &Binaryfile, basic_region &Region, bool Deferred);
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// loads specified piece of a binary terrain file into provided section
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static void load(basic_section &Section, terrain_block const &Block);
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private:
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// converts provided content of a text terrain file to binary format and stores it in specified file. returns: true on success, false otherwise
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static bool write(std::string const &Text, std::string const &Binaryfile, std::string &Message);
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};
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} // namespace scene
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//---------------------------------------------------------------------------
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