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a3e0f6da25
byuu says: I added (imperfect) memory conflict timing to the SA1. Before: - WRAM↔↔ROM ran 7% too fast - ROM↔↔ROM ran 100% too fast - WRAM↔↔IRAM ran 7% too fast - ROM↔↔IRAM ran 7% too fast - IRAM↔↔IRAM ran 287% too fast - BWRAM↔↔BWRAM ran 100% too fast - HDMA ROM↔↔ROM ran 15% too fast - HDMA WRAM↔↔ROM ran 15% too fast - DMA ROM↔↔ROM ran 100% too fast After: - ROM↔↔ROM runs 14% too fast - HDMA WRAM↔↔ROM runs 7% too fast - DMA ROM↔↔ROM runs 4% too fast If you enable this with the fast PPU + DSP, your framerate in SA1 games will drop by 51%. And even if you disable it, you'll still lose 9% speed in SA1 games, and 2% speed in non-SA1 games, because of changes needed to make this support possible. By default, I'm leaving this off. Compile with `-DACCURATE_SA1` (or uncomment the line in sfc/sfc.hpp) if you want to try it out. This'll almost certainly cause some SA1 regressions, so I guess we'll tackle those as they arise.
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
#pragma once
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//generic abstraction layer for common storage operations against both files and directories
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//these functions are not recursive; use directory::create() and directory::remove() for recursion
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#include <nall/platform.hpp>
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#include <nall/string.hpp>
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namespace nall {
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struct inode {
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enum class time : uint { create, modify, access };
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static auto exists(const string& name) -> bool {
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return access(name, F_OK) == 0;
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}
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static auto readable(const string& name) -> bool {
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return access(name, R_OK) == 0;
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}
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static auto writable(const string& name) -> bool {
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return access(name, W_OK) == 0;
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}
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static auto executable(const string& name) -> bool {
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return access(name, X_OK) == 0;
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}
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static auto mode(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_mode;
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}
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static auto uid(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_uid;
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}
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static auto gid(const string& name) -> uint {
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struct stat data{};
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stat(name, &data);
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return data.st_gid;
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}
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#if !defined(PLATFORM_WINDOWS)
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static auto user(const string& name) -> string {
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struct passwd* pw = getpwuid(uid(name));
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if(pw && pw->pw_name) return pw->pw_name;
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return {};
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}
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static auto group(const string& name) -> string {
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struct group* gr = getgrgid(gid(name));
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if(gr && gr->gr_name) return gr->gr_name;
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return {};
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}
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#endif
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static auto timestamp(const string& name, time mode = time::modify) -> uint64_t {
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struct stat data{};
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stat(name, &data);
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switch(mode) {
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#if defined(PLATFORM_WINDOWS)
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case time::create: return data.st_ctime;
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#else
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//st_birthtime may return -1 or st_atime if it is not supported
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//the best that can be done in this case is to return st_mtime if it's older
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case time::create: return min((uint)data.st_birthtime, (uint)data.st_mtime);
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#endif
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case time::modify: return data.st_mtime;
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//for performance reasons, last access time is usually not enabled on various filesystems
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//ensure that the last access time is not older than the last modify time (eg for NTFS)
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case time::access: return max((uint)data.st_atime, data.st_mtime);
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}
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return 0;
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}
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//returns true if 'name' already exists
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static auto create(const string& name, uint permissions = 0755) -> bool {
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if(exists(name)) return true;
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if(name.endsWith("/")) return mkdir(name, permissions) == 0;
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int fd = open(name, O_CREAT | O_EXCL, permissions);
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if(fd < 0) return false;
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return close(fd), true;
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}
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//returns false if 'name' and 'targetname' are on different file systems (requires copy)
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static auto rename(const string& name, const string& targetname) -> bool {
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return ::rename(name, targetname) == 0;
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}
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//returns false if 'name' is a directory that is not empty
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static auto remove(const string& name) -> bool {
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#if defined(PLATFORM_WINDOWS)
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if(name.endsWith("/")) return _wrmdir(utf16_t(name)) == 0;
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return _wunlink(utf16_t(name)) == 0;
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#else
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if(name.endsWith("/")) return rmdir(name) == 0;
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return unlink(name) == 0;
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#endif
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}
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};
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}
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