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https://github.com/hrydgard/ppsspp.git
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dd5c91108c
This way we don't get slow startup. This will also cache the CSO data, for example, rather than the raw data, using up less RAM. It might even be reasonable to enable on 32-bit.
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
// Copyright (c) 2015- PPSSPP Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program 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
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#pragma once
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#include <vector>
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#include "base/mutex.h"
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#include "Common/CommonTypes.h"
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#include "Core/Loaders.h"
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class RamCachingFileLoader : public FileLoader {
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public:
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RamCachingFileLoader(FileLoader *backend);
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~RamCachingFileLoader() override;
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bool Exists() override;
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bool IsDirectory() override;
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s64 FileSize() override;
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std::string Path() const override;
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void Seek(s64 absolutePos) override;
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size_t Read(size_t bytes, size_t count, void *data) override {
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return ReadAt(filepos_, bytes, count, data);
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}
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size_t Read(size_t bytes, void *data) override {
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return ReadAt(filepos_, bytes, data);
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}
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size_t ReadAt(s64 absolutePos, size_t bytes, size_t count, void *data) override {
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return ReadAt(absolutePos, bytes * count, data) / bytes;
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}
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size_t ReadAt(s64 absolutePos, size_t bytes, void *data) override;
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private:
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void InitCache();
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void ShutdownCache();
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size_t ReadFromCache(s64 pos, size_t bytes, void *data);
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// Guaranteed to read at least one block into the cache.
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void SaveIntoCache(s64 pos, size_t bytes);
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void StartReadAhead(s64 pos);
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u32 NextAheadBlock();
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enum {
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BLOCK_SIZE = 65536,
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BLOCK_SHIFT = 16,
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MAX_BLOCKS_PER_READ = 16,
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BLOCK_READAHEAD = 4,
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};
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s64 filesize_;
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s64 filepos_;
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FileLoader *backend_;
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u8 *cache_;
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int exists_;
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int isDirectory_;
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std::vector<u8> blocks_;
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recursive_mutex blocksMutex_;
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mutable recursive_mutex backendMutex_;
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u32 aheadRemaining_;
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s64 aheadPos_;
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bool aheadThread_;
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};
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