dynarmic: Update to 0118ee0

0118ee0 emit_x64_vector: packusdw is SSE4.1

src/common/color.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <cstring>
+
 #include "common/common_types.h"
 #include "common/swap.h"
 #include "common/vector_math.h"
@@ -55,7 +57,7 @@ constexpr u8 Convert8To6(u8 value) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRGBA8(const u8* bytes) {
+inline Math::Vec4<u8> DecodeRGBA8(const u8* bytes) {
     return {bytes[3], bytes[2], bytes[1], bytes[0]};
 }
 
@@ -64,7 +66,7 @@ inline const Math::Vec4<u8> DecodeRGBA8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRGB8(const u8* bytes) {
+inline Math::Vec4<u8> DecodeRGB8(const u8* bytes) {
     return {bytes[2], bytes[1], bytes[0], 255};
 }
 
@@ -73,7 +75,7 @@ inline const Math::Vec4<u8> DecodeRGB8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRG8(const u8* bytes) {
+inline Math::Vec4<u8> DecodeRG8(const u8* bytes) {
     return {bytes[1], bytes[0], 0, 255};
 }
 
@@ -82,8 +84,9 @@ inline const Math::Vec4<u8> DecodeRG8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRGB565(const u8* bytes) {
-    const u16_le pixel = *reinterpret_cast<const u16_le*>(bytes);
+inline Math::Vec4<u8> DecodeRGB565(const u8* bytes) {
+    u16_le pixel;
+    std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert5To8((pixel >> 11) & 0x1F), Convert6To8((pixel >> 5) & 0x3F),
             Convert5To8(pixel & 0x1F), 255};
 }
@@ -93,8 +96,9 @@ inline const Math::Vec4<u8> DecodeRGB565(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
-    const u16_le pixel = *reinterpret_cast<const u16_le*>(bytes);
+inline Math::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
+    u16_le pixel;
+    std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert5To8((pixel >> 11) & 0x1F), Convert5To8((pixel >> 6) & 0x1F),
             Convert5To8((pixel >> 1) & 0x1F), Convert1To8(pixel & 0x1)};
 }
@@ -104,8 +108,9 @@ inline const Math::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Math::Vec4<u8>
  */
-inline const Math::Vec4<u8> DecodeRGBA4(const u8* bytes) {
-    const u16_le pixel = *reinterpret_cast<const u16_le*>(bytes);
+inline Math::Vec4<u8> DecodeRGBA4(const u8* bytes) {
+    u16_le pixel;
+    std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert4To8((pixel >> 12) & 0xF), Convert4To8((pixel >> 8) & 0xF),
             Convert4To8((pixel >> 4) & 0xF), Convert4To8(pixel & 0xF)};
 }
@@ -116,7 +121,9 @@ inline const Math::Vec4<u8> DecodeRGBA4(const u8* bytes) {
  * @return Depth value as an u32
  */
 inline u32 DecodeD16(const u8* bytes) {
-    return *reinterpret_cast<const u16_le*>(bytes);
+    u16_le data;
+    std::memcpy(&data, bytes, sizeof(data));
+    return data;
 }
 
 /**
@@ -133,7 +140,7 @@ inline u32 DecodeD24(const u8* bytes) {
  * @param bytes Pointer to encoded source values
  * @return Resulting values stored as a Math::Vec2
  */
-inline const Math::Vec2<u32> DecodeD24S8(const u8* bytes) {
+inline Math::Vec2<u32> DecodeD24S8(const u8* bytes) {
     return {static_cast<u32>((bytes[2] << 16) | (bytes[1] << 8) | bytes[0]), bytes[3]};
 }
 
@@ -175,8 +182,10 @@ inline void EncodeRG8(const Math::Vec4<u8>& color, u8* bytes) {
  * @param bytes Destination pointer to store encoded color
  */
 inline void EncodeRGB565(const Math::Vec4<u8>& color, u8* bytes) {
-    *reinterpret_cast<u16_le*>(bytes) =
+    const u16_le data =
         (Convert8To5(color.r()) << 11) | (Convert8To6(color.g()) << 5) | Convert8To5(color.b());
+
+    std::memcpy(bytes, &data, sizeof(data));
 }
 
 /**
@@ -185,9 +194,10 @@ inline void EncodeRGB565(const Math::Vec4<u8>& color, u8* bytes) {
  * @param bytes Destination pointer to store encoded color
  */
 inline void EncodeRGB5A1(const Math::Vec4<u8>& color, u8* bytes) {
-    *reinterpret_cast<u16_le*>(bytes) = (Convert8To5(color.r()) << 11) |
-                                        (Convert8To5(color.g()) << 6) |
-                                        (Convert8To5(color.b()) << 1) | Convert8To1(color.a());
+    const u16_le data = (Convert8To5(color.r()) << 11) | (Convert8To5(color.g()) << 6) |
+                        (Convert8To5(color.b()) << 1) | Convert8To1(color.a());
+
+    std::memcpy(bytes, &data, sizeof(data));
 }
 
 /**
@@ -196,9 +206,10 @@ inline void EncodeRGB5A1(const Math::Vec4<u8>& color, u8* bytes) {
  * @param bytes Destination pointer to store encoded color
  */
 inline void EncodeRGBA4(const Math::Vec4<u8>& color, u8* bytes) {
-    *reinterpret_cast<u16_le*>(bytes) = (Convert8To4(color.r()) << 12) |
-                                        (Convert8To4(color.g()) << 8) |
-                                        (Convert8To4(color.b()) << 4) | Convert8To4(color.a());
+    const u16 data = (Convert8To4(color.r()) << 12) | (Convert8To4(color.g()) << 8) |
+                     (Convert8To4(color.b()) << 4) | Convert8To4(color.a());
+
+    std::memcpy(bytes, &data, sizeof(data));
 }
 
 /**
@@ -207,7 +218,8 @@ inline void EncodeRGBA4(const Math::Vec4<u8>& color, u8* bytes) {
  * @param bytes Pointer where to store the encoded value
  */
 inline void EncodeD16(u32 value, u8* bytes) {
-    *reinterpret_cast<u16_le*>(bytes) = value & 0xFFFF;
+    const u16_le data = static_cast<u16>(value);
+    std::memcpy(bytes, &data, sizeof(data));
 }
 
 /**

src/common/file_util.cpp

@@ -884,11 +884,21 @@ std::string_view RemoveTrailingSlash(std::string_view path) {
     return path;
 }
 
-std::string SanitizePath(std::string_view path_) {
+std::string SanitizePath(std::string_view path_, DirectorySeparator directory_separator) {
     std::string path(path_);
-    std::replace(path.begin(), path.end(), '\\', '/');
+    char type1 = directory_separator == DirectorySeparator::BackwardSlash ? '/' : '\\';
+    char type2 = directory_separator == DirectorySeparator::BackwardSlash ? '\\' : '/';
+
+    if (directory_separator == DirectorySeparator::PlatformDefault) {
+#ifdef _WIN32
+        type1 = '/';
+        type2 = '\\';
+#endif
+    }
+
+    std::replace(path.begin(), path.end(), type1, type2);
     path.erase(std::unique(path.begin(), path.end(),
-                           [](char c1, char c2) { return c1 == '/' && c2 == '/'; }),
+                           [type2](char c1, char c2) { return c1 == type2 && c2 == type2; }),
                path.end());
     return std::string(RemoveTrailingSlash(path));
 }

src/common/file_util.h

@@ -182,8 +182,12 @@ std::vector<T> SliceVector(const std::vector<T>& vector, size_t first, size_t la
     return std::vector<T>(vector.begin() + first, vector.begin() + first + last);
 }
 
-// Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'.
-std::string SanitizePath(std::string_view path);
+enum class DirectorySeparator { ForwardSlash, BackwardSlash, PlatformDefault };
+
+// Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'. Makes '/' into '\\'
+// depending if directory_separator is BackwardSlash or PlatformDefault and running on windows
+std::string SanitizePath(std::string_view path,
+                         DirectorySeparator directory_separator = DirectorySeparator::ForwardSlash);
 
 // simple wrapper for cstdlib file functions to
 // hopefully will make error checking easier

src/common/logging/backend.cpp

@@ -171,15 +171,21 @@ void FileBackend::Write(const Entry& entry) {
     SUB(Service, ARP)                                                                              \
     SUB(Service, BCAT)                                                                             \
     SUB(Service, BPC)                                                                              \
+    SUB(Service, BTDRV)                                                                            \
     SUB(Service, BTM)                                                                              \
     SUB(Service, Capture)                                                                          \
+    SUB(Service, ERPT)                                                                             \
+    SUB(Service, ETicket)                                                                          \
+    SUB(Service, EUPLD)                                                                            \
     SUB(Service, Fatal)                                                                            \
     SUB(Service, FGM)                                                                              \
     SUB(Service, Friend)                                                                           \
     SUB(Service, FS)                                                                               \
+    SUB(Service, GRC)                                                                              \
     SUB(Service, HID)                                                                              \
     SUB(Service, LBL)                                                                              \
     SUB(Service, LDN)                                                                              \
+    SUB(Service, LDR)                                                                              \
     SUB(Service, LM)                                                                               \
     SUB(Service, Migration)                                                                        \
     SUB(Service, Mii)                                                                              \
@@ -188,11 +194,13 @@ void FileBackend::Write(const Entry& entry) {
     SUB(Service, NFC)                                                                              \
     SUB(Service, NFP)                                                                              \
     SUB(Service, NIFM)                                                                             \
+    SUB(Service, NIM)                                                                              \
     SUB(Service, NS)                                                                               \
     SUB(Service, NVDRV)                                                                            \
     SUB(Service, PCIE)                                                                             \
     SUB(Service, PCTL)                                                                             \
     SUB(Service, PCV)                                                                              \
+    SUB(Service, PM)                                                                               \
     SUB(Service, PREPO)                                                                            \
     SUB(Service, PSC)                                                                              \
     SUB(Service, SET)                                                                              \

src/common/logging/log.h

@@ -58,15 +58,21 @@ enum class Class : ClassType {
     Service_Audio,     ///< The Audio (Audio control) service
     Service_BCAT,      ///< The BCAT service
     Service_BPC,       ///< The BPC service
+    Service_BTDRV,     ///< The Bluetooth driver service
     Service_BTM,       ///< The BTM service
     Service_Capture,   ///< The capture service
+    Service_ERPT,      ///< The error reporting service
+    Service_ETicket,   ///< The ETicket service
+    Service_EUPLD,     ///< The error upload service
     Service_Fatal,     ///< The Fatal service
     Service_FGM,       ///< The FGM service
     Service_Friend,    ///< The friend service
     Service_FS,        ///< The FS (Filesystem) service
+    Service_GRC,       ///< The game recording service
     Service_HID,       ///< The HID (Human interface device) service
     Service_LBL,       ///< The LBL (LCD backlight) service
     Service_LDN,       ///< The LDN (Local domain network) service
+    Service_LDR,       ///< The loader service
     Service_LM,        ///< The LM (Logger) service
     Service_Migration, ///< The migration service
     Service_Mii,       ///< The Mii service
@@ -75,11 +81,13 @@ enum class Class : ClassType {
     Service_NFC,       ///< The NFC (Near-field communication) service
     Service_NFP,       ///< The NFP service
     Service_NIFM,      ///< The NIFM (Network interface) service
+    Service_NIM,       ///< The NIM service
     Service_NS,        ///< The NS services
     Service_NVDRV,     ///< The NVDRV (Nvidia driver) service
     Service_PCIE,      ///< The PCIe service
     Service_PCTL,      ///< The PCTL (Parental control) service
     Service_PCV,       ///< The PCV service
+    Service_PM,        ///< The PM service
     Service_PREPO,     ///< The PREPO (Play report) service
     Service_PSC,       ///< The PSC service
     Service_SET,       ///< The SET (Settings) service

src/common/vector_math.h

@@ -78,7 +78,7 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec2<std::enable_if_t<std::is_signed<U>::value, U>> operator-() const {
+    constexpr Vec2<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y};
     }
     constexpr Vec2<decltype(T{} * T{})> operator*(const Vec2& other) const {
@@ -227,7 +227,7 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec3<std::enable_if_t<std::is_signed<U>::value, U>> operator-() const {
+    constexpr Vec3<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y, -z};
     }
 
@@ -436,7 +436,7 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec4<std::enable_if_t<std::is_signed<U>::value, U>> operator-() const {
+    constexpr Vec4<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y, -z, -w};
     }
 

src/core/core.cpp

@@ -89,7 +89,7 @@ System::ResultStatus System::SingleStep() {
 }
 
 System::ResultStatus System::Load(EmuWindow& emu_window, const std::string& filepath) {
-    app_loader = Loader::GetLoader(std::make_shared<FileSys::RealVfsFile>(filepath));
+    app_loader = Loader::GetLoader(virtual_filesystem->OpenFile(filepath, FileSys::Mode::Read));
 
     if (!app_loader) {
         LOG_CRITICAL(Core, "Failed to obtain loader for {}!", filepath);
@@ -174,6 +174,10 @@ System::ResultStatus System::Init(EmuWindow& emu_window) {
 
     CoreTiming::Init();
 
+    // Create a default fs if one doesn't already exist.
+    if (virtual_filesystem == nullptr)
+        virtual_filesystem = std::make_shared<FileSys::RealVfsFilesystem>();
+
     current_process = Kernel::Process::Create("main");
 
     cpu_barrier = std::make_shared<CpuBarrier>();
@@ -186,7 +190,7 @@ System::ResultStatus System::Init(EmuWindow& emu_window) {
     service_manager = std::make_shared<Service::SM::ServiceManager>();
 
     Kernel::Init();
-    Service::Init(service_manager);
+    Service::Init(service_manager, virtual_filesystem);
     GDBStub::Init();
 
     renderer = VideoCore::CreateRenderer(emu_window);

src/core/core.h

@@ -17,6 +17,8 @@
 #include "core/memory.h"
 #include "core/perf_stats.h"
 #include "core/telemetry_session.h"
+#include "file_sys/vfs_real.h"
+#include "hle/service/filesystem/filesystem.h"
 #include "video_core/debug_utils/debug_utils.h"
 #include "video_core/gpu.h"
 
@@ -211,6 +213,14 @@ public:
         return debug_context;
     }
 
+    void SetFilesystem(FileSys::VirtualFilesystem vfs) {
+        virtual_filesystem = std::move(vfs);
+    }
+
+    FileSys::VirtualFilesystem GetFilesystem() const {
+        return virtual_filesystem;
+    }
+
 private:
     System();
 
@@ -225,6 +235,8 @@ private:
      */
     ResultStatus Init(EmuWindow& emu_window);
 
+    /// RealVfsFilesystem instance
+    FileSys::VirtualFilesystem virtual_filesystem;
     /// AppLoader used to load the current executing application
     std::unique_ptr<Loader::AppLoader> app_loader;
     std::unique_ptr<VideoCore::RendererBase> renderer;

src/core/file_sys/directory.h

@@ -4,8 +4,9 @@
 
 #pragma once
 
-#include <array>
 #include <cstddef>
+#include <iterator>
+#include <string_view>
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 
@@ -21,9 +22,14 @@ enum EntryType : u8 {
 
 // Structure of a directory entry, from
 // http://switchbrew.org/index.php?title=Filesystem_services#DirectoryEntry
-const size_t FILENAME_LENGTH = 0x300;
 struct Entry {
-    char filename[FILENAME_LENGTH];
+    Entry(std::string_view view, EntryType entry_type, u64 entry_size)
+        : type{entry_type}, file_size{entry_size} {
+        const size_t copy_size = view.copy(filename, std::size(filename) - 1);
+        filename[copy_size] = '\0';
+    }
+
+    char filename[0x300];
     INSERT_PADDING_BYTES(4);
     EntryType type;
     INSERT_PADDING_BYTES(3);

src/core/file_sys/savedata_factory.h

@@ -7,6 +7,7 @@
 #include <memory>
 #include <string>
 #include "common/common_types.h"
+#include "common/swap.h"
 #include "core/hle/result.h"
 
 namespace FileSys {

src/core/file_sys/vfs.cpp

@@ -4,12 +4,160 @@
 
 #include <algorithm>
 #include <numeric>
+#include <string>
+#include "common/common_paths.h"
 #include "common/file_util.h"
 #include "common/logging/backend.h"
 #include "core/file_sys/vfs.h"
 
 namespace FileSys {
 
+VfsFilesystem::VfsFilesystem(VirtualDir root_) : root(std::move(root_)) {}
+
+VfsFilesystem::~VfsFilesystem() = default;
+
+std::string VfsFilesystem::GetName() const {
+    return root->GetName();
+}
+
+bool VfsFilesystem::IsReadable() const {
+    return root->IsReadable();
+}
+
+bool VfsFilesystem::IsWritable() const {
+    return root->IsWritable();
+}
+
+VfsEntryType VfsFilesystem::GetEntryType(std::string_view path_) const {
+    const auto path = FileUtil::SanitizePath(path_);
+    if (root->GetFileRelative(path) != nullptr)
+        return VfsEntryType::File;
+    if (root->GetDirectoryRelative(path) != nullptr)
+        return VfsEntryType::Directory;
+
+    return VfsEntryType::None;
+}
+
+VirtualFile VfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_);
+    return root->GetFileRelative(path);
+}
+
+VirtualFile VfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_);
+    return root->CreateFileRelative(path);
+}
+
+VirtualFile VfsFilesystem::CopyFile(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path = FileUtil::SanitizePath(old_path_);
+    const auto new_path = FileUtil::SanitizePath(new_path_);
+
+    // VfsDirectory impls are only required to implement copy across the current directory.
+    if (FileUtil::GetParentPath(old_path) == FileUtil::GetParentPath(new_path)) {
+        if (!root->Copy(FileUtil::GetFilename(old_path), FileUtil::GetFilename(new_path)))
+            return nullptr;
+        return OpenFile(new_path, Mode::ReadWrite);
+    }
+
+    // Do it using RawCopy. Non-default impls are encouraged to optimize this.
+    const auto old_file = OpenFile(old_path, Mode::Read);
+    if (old_file == nullptr)
+        return nullptr;
+    auto new_file = OpenFile(new_path, Mode::Read);
+    if (new_file != nullptr)
+        return nullptr;
+    new_file = CreateFile(new_path, Mode::Write);
+    if (new_file == nullptr)
+        return nullptr;
+    if (!VfsRawCopy(old_file, new_file))
+        return nullptr;
+    return new_file;
+}
+
+VirtualFile VfsFilesystem::MoveFile(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path = FileUtil::SanitizePath(old_path_);
+    const auto new_path = FileUtil::SanitizePath(new_path_);
+
+    // Again, non-default impls are highly encouraged to provide a more optimized version of this.
+    auto out = CopyFile(old_path_, new_path_);
+    if (out == nullptr)
+        return nullptr;
+    if (DeleteFile(old_path))
+        return out;
+    return nullptr;
+}
+
+bool VfsFilesystem::DeleteFile(std::string_view path_) {
+    const auto path = FileUtil::SanitizePath(path_);
+    auto parent = OpenDirectory(FileUtil::GetParentPath(path), Mode::Write);
+    if (parent == nullptr)
+        return false;
+    return parent->DeleteFile(FileUtil::GetFilename(path));
+}
+
+VirtualDir VfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_);
+    return root->GetDirectoryRelative(path);
+}
+
+VirtualDir VfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_);
+    return root->CreateDirectoryRelative(path);
+}
+
+VirtualDir VfsFilesystem::CopyDirectory(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path = FileUtil::SanitizePath(old_path_);
+    const auto new_path = FileUtil::SanitizePath(new_path_);
+
+    // Non-default impls are highly encouraged to provide a more optimized version of this.
+    auto old_dir = OpenDirectory(old_path, Mode::Read);
+    if (old_dir == nullptr)
+        return nullptr;
+    auto new_dir = OpenDirectory(new_path, Mode::Read);
+    if (new_dir != nullptr)
+        return nullptr;
+    new_dir = CreateDirectory(new_path, Mode::Write);
+    if (new_dir == nullptr)
+        return nullptr;
+
+    for (const auto& file : old_dir->GetFiles()) {
+        const auto x =
+            CopyFile(old_path + DIR_SEP + file->GetName(), new_path + DIR_SEP + file->GetName());
+        if (x == nullptr)
+            return nullptr;
+    }
+
+    for (const auto& dir : old_dir->GetSubdirectories()) {
+        const auto x =
+            CopyDirectory(old_path + DIR_SEP + dir->GetName(), new_path + DIR_SEP + dir->GetName());
+        if (x == nullptr)
+            return nullptr;
+    }
+
+    return new_dir;
+}
+
+VirtualDir VfsFilesystem::MoveDirectory(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path = FileUtil::SanitizePath(old_path_);
+    const auto new_path = FileUtil::SanitizePath(new_path_);
+
+    // Non-default impls are highly encouraged to provide a more optimized version of this.
+    auto out = CopyDirectory(old_path_, new_path_);
+    if (out == nullptr)
+        return nullptr;
+    if (DeleteDirectory(old_path))
+        return out;
+    return nullptr;
+}
+
+bool VfsFilesystem::DeleteDirectory(std::string_view path_) {
+    const auto path = FileUtil::SanitizePath(path_);
+    auto parent = OpenDirectory(FileUtil::GetParentPath(path), Mode::Write);
+    if (parent == nullptr)
+        return false;
+    return parent->DeleteSubdirectoryRecursive(FileUtil::GetFilename(path));
+}
+
 VfsFile::~VfsFile() = default;
 
 std::string VfsFile::GetExtension() const {

src/core/file_sys/vfs.h

@@ -11,14 +11,74 @@
 #include <vector>
 #include "boost/optional.hpp"
 #include "common/common_types.h"
+#include "core/file_sys/mode.h"
 
 namespace FileSys {
+
+struct VfsFilesystem;
 struct VfsFile;
 struct VfsDirectory;
 
-// Convenience typedefs to use VfsDirectory and VfsFile
-using VirtualDir = std::shared_ptr<FileSys::VfsDirectory>;
-using VirtualFile = std::shared_ptr<FileSys::VfsFile>;
+// Convenience typedefs to use Vfs* interfaces
+using VirtualFilesystem = std::shared_ptr<VfsFilesystem>;
+using VirtualDir = std::shared_ptr<VfsDirectory>;
+using VirtualFile = std::shared_ptr<VfsFile>;
+
+// An enumeration representing what can be at the end of a path in a VfsFilesystem
+enum class VfsEntryType {
+    None,
+    File,
+    Directory,
+};
+
+// A class representing an abstract filesystem. A default implementation given the root VirtualDir
+// is provided for convenience, but if the Vfs implementation has any additional state or
+// functionality, they will need to override.
+struct VfsFilesystem : NonCopyable {
+    VfsFilesystem(VirtualDir root);
+    virtual ~VfsFilesystem();
+
+    // Gets the friendly name for the filesystem.
+    virtual std::string GetName() const;
+
+    // Return whether or not the user has read permissions on this filesystem.
+    virtual bool IsReadable() const;
+    // Return whether or not the user has write permission on this filesystem.
+    virtual bool IsWritable() const;
+
+    // Determine if the entry at path is non-existant, a file, or a directory.
+    virtual VfsEntryType GetEntryType(std::string_view path) const;
+
+    // Opens the file with path relative to root. If it doesn't exist, returns nullptr.
+    virtual VirtualFile OpenFile(std::string_view path, Mode perms);
+    // Creates a new, empty file at path
+    virtual VirtualFile CreateFile(std::string_view path, Mode perms);
+    // Copies the file from old_path to new_path, returning the new file on success and nullptr on
+    // failure.
+    virtual VirtualFile CopyFile(std::string_view old_path, std::string_view new_path);
+    // Moves the file from old_path to new_path, returning the moved file on success and nullptr on
+    // failure.
+    virtual VirtualFile MoveFile(std::string_view old_path, std::string_view new_path);
+    // Deletes the file with path relative to root, returing true on success.
+    virtual bool DeleteFile(std::string_view path);
+
+    // Opens the directory with path relative to root. If it doesn't exist, returns nullptr.
+    virtual VirtualDir OpenDirectory(std::string_view path, Mode perms);
+    // Creates a new, empty directory at path
+    virtual VirtualDir CreateDirectory(std::string_view path, Mode perms);
+    // Copies the directory from old_path to new_path, returning the new directory on success and
+    // nullptr on failure.
+    virtual VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path);
+    // Moves the directory from old_path to new_path, returning the moved directory on success and
+    // nullptr on failure.
+    virtual VirtualDir MoveDirectory(std::string_view old_path, std::string_view new_path);
+    // Deletes the directory with path relative to root, returing true on success.
+    virtual bool DeleteDirectory(std::string_view path);
+
+protected:
+    // Root directory in default implementation.
+    VirtualDir root;
+};
 
 // A class representing a file in an abstract filesystem.
 struct VfsFile : NonCopyable {

src/core/file_sys/vfs_real.cpp

@@ -6,7 +6,7 @@
 #include <cstddef>
 #include <iterator>
 #include <utility>
-
+#include "common/assert.h"
 #include "common/common_paths.h"
 #include "common/logging/log.h"
 #include "core/file_sys/vfs_real.h"
@@ -29,6 +29,8 @@ static std::string ModeFlagsToString(Mode mode) {
             mode_str = "a";
         else if (mode & Mode::Write)
             mode_str = "w";
+        else
+            UNREACHABLE_MSG("Invalid file open mode: {:02X}", static_cast<u8>(mode));
     }
 
     mode_str += "b";
@@ -36,8 +38,174 @@ static std::string ModeFlagsToString(Mode mode) {
     return mode_str;
 }
 
-RealVfsFile::RealVfsFile(const std::string& path_, Mode perms_)
-    : backing(path_, ModeFlagsToString(perms_).c_str()), path(path_),
+RealVfsFilesystem::RealVfsFilesystem() : VfsFilesystem(nullptr) {}
+
+std::string RealVfsFilesystem::GetName() const {
+    return "Real";
+}
+
+bool RealVfsFilesystem::IsReadable() const {
+    return true;
+}
+
+bool RealVfsFilesystem::IsWritable() const {
+    return true;
+}
+
+VfsEntryType RealVfsFilesystem::GetEntryType(std::string_view path_) const {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (!FileUtil::Exists(path))
+        return VfsEntryType::None;
+    if (FileUtil::IsDirectory(path))
+        return VfsEntryType::Directory;
+
+    return VfsEntryType::File;
+}
+
+VirtualFile RealVfsFilesystem::OpenFile(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (cache.find(path) != cache.end()) {
+        auto weak = cache[path];
+        if (!weak.expired()) {
+            return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, weak.lock(), path, perms));
+        }
+    }
+
+    if (!FileUtil::Exists(path) && (perms & Mode::WriteAppend) != 0)
+        FileUtil::CreateEmptyFile(path);
+
+    auto backing = std::make_shared<FileUtil::IOFile>(path, ModeFlagsToString(perms).c_str());
+    cache[path] = backing;
+
+    // Cannot use make_shared as RealVfsFile constructor is private
+    return std::shared_ptr<RealVfsFile>(new RealVfsFile(*this, backing, path, perms));
+}
+
+VirtualFile RealVfsFilesystem::CreateFile(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (!FileUtil::Exists(path) && !FileUtil::CreateEmptyFile(path))
+        return nullptr;
+    return OpenFile(path, perms);
+}
+
+VirtualFile RealVfsFilesystem::CopyFile(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path =
+        FileUtil::SanitizePath(old_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    const auto new_path =
+        FileUtil::SanitizePath(new_path_, FileUtil::DirectorySeparator::PlatformDefault);
+
+    if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
+        FileUtil::IsDirectory(old_path) || !FileUtil::Copy(old_path, new_path))
+        return nullptr;
+    return OpenFile(new_path, Mode::ReadWrite);
+}
+
+VirtualFile RealVfsFilesystem::MoveFile(std::string_view old_path_, std::string_view new_path_) {
+    const auto old_path =
+        FileUtil::SanitizePath(old_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    const auto new_path =
+        FileUtil::SanitizePath(new_path_, FileUtil::DirectorySeparator::PlatformDefault);
+
+    if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
+        FileUtil::IsDirectory(old_path) || !FileUtil::Rename(old_path, new_path))
+        return nullptr;
+
+    if (cache.find(old_path) != cache.end()) {
+        auto cached = cache[old_path];
+        if (!cached.expired()) {
+            auto file = cached.lock();
+            file->Open(new_path, "r+b");
+            cache.erase(old_path);
+            cache[new_path] = file;
+        }
+    }
+    return OpenFile(new_path, Mode::ReadWrite);
+}
+
+bool RealVfsFilesystem::DeleteFile(std::string_view path_) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (cache.find(path) != cache.end()) {
+        if (!cache[path].expired())
+            cache[path].lock()->Close();
+        cache.erase(path);
+    }
+    return FileUtil::Delete(path);
+}
+
+VirtualDir RealVfsFilesystem::OpenDirectory(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    // Cannot use make_shared as RealVfsDirectory constructor is private
+    return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
+}
+
+VirtualDir RealVfsFilesystem::CreateDirectory(std::string_view path_, Mode perms) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (!FileUtil::Exists(path) && !FileUtil::CreateDir(path))
+        return nullptr;
+    // Cannot use make_shared as RealVfsDirectory constructor is private
+    return std::shared_ptr<RealVfsDirectory>(new RealVfsDirectory(*this, path, perms));
+}
+
+VirtualDir RealVfsFilesystem::CopyDirectory(std::string_view old_path_,
+                                            std::string_view new_path_) {
+    const auto old_path =
+        FileUtil::SanitizePath(old_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    const auto new_path =
+        FileUtil::SanitizePath(new_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
+        !FileUtil::IsDirectory(old_path))
+        return nullptr;
+    FileUtil::CopyDir(old_path, new_path);
+    return OpenDirectory(new_path, Mode::ReadWrite);
+}
+
+VirtualDir RealVfsFilesystem::MoveDirectory(std::string_view old_path_,
+                                            std::string_view new_path_) {
+    const auto old_path =
+        FileUtil::SanitizePath(old_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    const auto new_path =
+        FileUtil::SanitizePath(new_path_, FileUtil::DirectorySeparator::PlatformDefault);
+    if (!FileUtil::Exists(old_path) || FileUtil::Exists(new_path) ||
+        FileUtil::IsDirectory(old_path) || !FileUtil::Rename(old_path, new_path))
+        return nullptr;
+
+    for (auto& kv : cache) {
+        // Path in cache starts with old_path
+        if (kv.first.rfind(old_path, 0) == 0) {
+            const auto file_old_path =
+                FileUtil::SanitizePath(kv.first, FileUtil::DirectorySeparator::PlatformDefault);
+            const auto file_new_path =
+                FileUtil::SanitizePath(new_path + DIR_SEP + kv.first.substr(old_path.size()),
+                                       FileUtil::DirectorySeparator::PlatformDefault);
+            auto cached = cache[file_old_path];
+            if (!cached.expired()) {
+                auto file = cached.lock();
+                file->Open(file_new_path, "r+b");
+                cache.erase(file_old_path);
+                cache[file_new_path] = file;
+            }
+        }
+    }
+
+    return OpenDirectory(new_path, Mode::ReadWrite);
+}
+
+bool RealVfsFilesystem::DeleteDirectory(std::string_view path_) {
+    const auto path = FileUtil::SanitizePath(path_, FileUtil::DirectorySeparator::PlatformDefault);
+    for (auto& kv : cache) {
+        // Path in cache starts with old_path
+        if (kv.first.rfind(path, 0) == 0) {
+            if (!cache[kv.first].expired())
+                cache[kv.first].lock()->Close();
+            cache.erase(kv.first);
+        }
+    }
+    return FileUtil::DeleteDirRecursively(path);
+}
+
+RealVfsFile::RealVfsFile(RealVfsFilesystem& base_, std::shared_ptr<FileUtil::IOFile> backing_,
+                         const std::string& path_, Mode perms_)
+    : base(base_), backing(std::move(backing_)), path(path_),
       parent_path(FileUtil::GetParentPath(path_)),
       path_components(FileUtil::SplitPathComponents(path_)),
       parent_components(FileUtil::SliceVector(path_components, 0, path_components.size() - 1)),
@@ -48,15 +216,15 @@ std::string RealVfsFile::GetName() const {
 }
 
 size_t RealVfsFile::GetSize() const {
-    return backing.GetSize();
+    return backing->GetSize();
 }
 
 bool RealVfsFile::Resize(size_t new_size) {
-    return backing.Resize(new_size);
+    return backing->Resize(new_size);
 }
 
 std::shared_ptr<VfsDirectory> RealVfsFile::GetContainingDirectory() const {
-    return std::make_shared<RealVfsDirectory>(parent_path, perms);
+    return base.OpenDirectory(parent_path, perms);
 }
 
 bool RealVfsFile::IsWritable() const {
@@ -68,62 +236,118 @@ bool RealVfsFile::IsReadable() const {
 }
 
 size_t RealVfsFile::Read(u8* data, size_t length, size_t offset) const {
-    if (!backing.Seek(offset, SEEK_SET))
+    if (!backing->Seek(offset, SEEK_SET))
         return 0;
-    return backing.ReadBytes(data, length);
+    return backing->ReadBytes(data, length);
 }
 
 size_t RealVfsFile::Write(const u8* data, size_t length, size_t offset) {
-    if (!backing.Seek(offset, SEEK_SET))
+    if (!backing->Seek(offset, SEEK_SET))
         return 0;
-    return backing.WriteBytes(data, length);
+    return backing->WriteBytes(data, length);
 }
 
 bool RealVfsFile::Rename(std::string_view name) {
-    std::string name_str(name.begin(), name.end());
-    const auto out = FileUtil::Rename(GetName(), name_str);
+    return base.MoveFile(path, parent_path + DIR_SEP + std::string(name)) != nullptr;
+}
 
-    path = (parent_path + DIR_SEP).append(name);
-    path_components = parent_components;
-    path_components.push_back(std::move(name_str));
-    backing = FileUtil::IOFile(path, ModeFlagsToString(perms).c_str());
+bool RealVfsFile::Close() {
+    return backing->Close();
+}
+
+// TODO(DarkLordZach): MSVC would not let me combine the following two functions using 'if
+// constexpr' because there is a compile error in the branch not used.
+
+template <>
+std::vector<VirtualFile> RealVfsDirectory::IterateEntries<RealVfsFile, VfsFile>() const {
+    if (perms == Mode::Append)
+        return {};
+
+    std::vector<VirtualFile> out;
+    FileUtil::ForeachDirectoryEntry(
+        nullptr, path,
+        [&out, this](u64* entries_out, const std::string& directory, const std::string& filename) {
+            const std::string full_path = directory + DIR_SEP + filename;
+            if (!FileUtil::IsDirectory(full_path))
+                out.emplace_back(base.OpenFile(full_path, perms));
+            return true;
+        });
 
     return out;
 }
 
-bool RealVfsFile::Close() {
-    return backing.Close();
+template <>
+std::vector<VirtualDir> RealVfsDirectory::IterateEntries<RealVfsDirectory, VfsDirectory>() const {
+    if (perms == Mode::Append)
+        return {};
+
+    std::vector<VirtualDir> out;
+    FileUtil::ForeachDirectoryEntry(
+        nullptr, path,
+        [&out, this](u64* entries_out, const std::string& directory, const std::string& filename) {
+            const std::string full_path = directory + DIR_SEP + filename;
+            if (FileUtil::IsDirectory(full_path))
+                out.emplace_back(base.OpenDirectory(full_path, perms));
+            return true;
+        });
+
+    return out;
 }
 
-RealVfsDirectory::RealVfsDirectory(const std::string& path_, Mode perms_)
-    : path(FileUtil::RemoveTrailingSlash(path_)), parent_path(FileUtil::GetParentPath(path)),
+RealVfsDirectory::RealVfsDirectory(RealVfsFilesystem& base_, const std::string& path_, Mode perms_)
+    : base(base_), path(FileUtil::RemoveTrailingSlash(path_)),
+      parent_path(FileUtil::GetParentPath(path)),
       path_components(FileUtil::SplitPathComponents(path)),
       parent_components(FileUtil::SliceVector(path_components, 0, path_components.size() - 1)),
       perms(perms_) {
     if (!FileUtil::Exists(path) && perms & Mode::WriteAppend)
         FileUtil::CreateDir(path);
+}
 
-    if (perms == Mode::Append)
-        return;
+std::shared_ptr<VfsFile> RealVfsDirectory::GetFileRelative(std::string_view path) const {
+    const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
+    if (!FileUtil::Exists(full_path))
+        return nullptr;
+    return base.OpenFile(full_path, perms);
+}
 
-    FileUtil::ForeachDirectoryEntry(
-        nullptr, path,
-        [this](u64* entries_out, const std::string& directory, const std::string& filename) {
-            std::string full_path = directory + DIR_SEP + filename;
-            if (FileUtil::IsDirectory(full_path))
-                subdirectories.emplace_back(std::make_shared<RealVfsDirectory>(full_path, perms));
-            else
-                files.emplace_back(std::make_shared<RealVfsFile>(full_path, perms));
-            return true;
-        });
+std::shared_ptr<VfsDirectory> RealVfsDirectory::GetDirectoryRelative(std::string_view path) const {
+    const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
+    if (!FileUtil::Exists(full_path))
+        return nullptr;
+    return base.OpenDirectory(full_path, perms);
+}
+
+std::shared_ptr<VfsFile> RealVfsDirectory::GetFile(std::string_view name) const {
+    return GetFileRelative(name);
+}
+
+std::shared_ptr<VfsDirectory> RealVfsDirectory::GetSubdirectory(std::string_view name) const {
+    return GetDirectoryRelative(name);
+}
+
+std::shared_ptr<VfsFile> RealVfsDirectory::CreateFileRelative(std::string_view path) {
+    const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
+    return base.CreateFile(full_path, perms);
+}
+
+std::shared_ptr<VfsDirectory> RealVfsDirectory::CreateDirectoryRelative(std::string_view path) {
+    const auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(path));
+    auto parent = std::string(FileUtil::GetParentPath(full_path));
+    return base.CreateDirectory(full_path, perms);
+}
+
+bool RealVfsDirectory::DeleteSubdirectoryRecursive(std::string_view name) {
+    auto full_path = FileUtil::SanitizePath(this->path + DIR_SEP + std::string(name));
+    return base.DeleteDirectory(full_path);
 }
 
 std::vector<std::shared_ptr<VfsFile>> RealVfsDirectory::GetFiles() const {
-    return files;
+    return IterateEntries<RealVfsFile, VfsFile>();
 }
 
 std::vector<std::shared_ptr<VfsDirectory>> RealVfsDirectory::GetSubdirectories() const {
-    return subdirectories;
+    return IterateEntries<RealVfsDirectory, VfsDirectory>();
 }
 
 bool RealVfsDirectory::IsWritable() const {
@@ -142,57 +366,32 @@ std::shared_ptr<VfsDirectory> RealVfsDirectory::GetParentDirectory() const {
     if (path_components.size() <= 1)
         return nullptr;
 
-    return std::make_shared<RealVfsDirectory>(parent_path, perms);
+    return base.OpenDirectory(parent_path, perms);
 }
 
 std::shared_ptr<VfsDirectory> RealVfsDirectory::CreateSubdirectory(std::string_view name) {
     const std::string subdir_path = (path + DIR_SEP).append(name);
-
-    if (!FileUtil::CreateDir(subdir_path)) {
-        return nullptr;
-    }
-
-    subdirectories.emplace_back(std::make_shared<RealVfsDirectory>(subdir_path, perms));
-    return subdirectories.back();
+    return base.CreateDirectory(subdir_path, perms);
 }
 
 std::shared_ptr<VfsFile> RealVfsDirectory::CreateFile(std::string_view name) {
     const std::string file_path = (path + DIR_SEP).append(name);
-
-    if (!FileUtil::CreateEmptyFile(file_path)) {
-        return nullptr;
-    }
-
-    files.emplace_back(std::make_shared<RealVfsFile>(file_path, perms));
-    return files.back();
+    return base.CreateFile(file_path, perms);
 }
 
 bool RealVfsDirectory::DeleteSubdirectory(std::string_view name) {
     const std::string subdir_path = (path + DIR_SEP).append(name);
-
-    return FileUtil::DeleteDirRecursively(subdir_path);
+    return base.DeleteDirectory(subdir_path);
 }
 
 bool RealVfsDirectory::DeleteFile(std::string_view name) {
-    const auto file = GetFile(name);
-
-    if (file == nullptr) {
-        return false;
-    }
-
-    files.erase(std::find(files.begin(), files.end(), file));
-
-    auto real_file = std::static_pointer_cast<RealVfsFile>(file);
-    real_file->Close();
-
     const std::string file_path = (path + DIR_SEP).append(name);
-    return FileUtil::Delete(file_path);
+    return base.DeleteFile(file_path);
 }
 
 bool RealVfsDirectory::Rename(std::string_view name) {
     const std::string new_name = (parent_path + DIR_SEP).append(name);
-
-    return FileUtil::Rename(path, new_name);
+    return base.MoveFile(path, new_name) != nullptr;
 }
 
 std::string RealVfsDirectory::GetFullPath() const {
@@ -202,16 +401,6 @@ std::string RealVfsDirectory::GetFullPath() const {
 }
 
 bool RealVfsDirectory::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
-    const auto iter = std::find(files.begin(), files.end(), file);
-    if (iter == files.end())
-        return false;
-
-    const std::ptrdiff_t offset = std::distance(files.begin(), iter);
-    files[offset] = files.back();
-    files.pop_back();
-
-    subdirectories.emplace_back(std::move(dir));
-
-    return true;
+    return false;
 }
 } // namespace FileSys

src/core/file_sys/vfs_real.h

@@ -6,18 +6,45 @@
 
 #include <string_view>
 
+#include <boost/container/flat_map.hpp>
 #include "common/file_util.h"
 #include "core/file_sys/mode.h"
 #include "core/file_sys/vfs.h"
 
 namespace FileSys {
 
+class RealVfsFilesystem : public VfsFilesystem {
+public:
+    RealVfsFilesystem();
+
+    std::string GetName() const override;
+    bool IsReadable() const override;
+    bool IsWritable() const override;
+    VfsEntryType GetEntryType(std::string_view path) const override;
+    VirtualFile OpenFile(std::string_view path, Mode perms = Mode::Read) override;
+    VirtualFile CreateFile(std::string_view path, Mode perms = Mode::ReadWrite) override;
+    VirtualFile CopyFile(std::string_view old_path, std::string_view new_path) override;
+    VirtualFile MoveFile(std::string_view old_path, std::string_view new_path) override;
+    bool DeleteFile(std::string_view path) override;
+    VirtualDir OpenDirectory(std::string_view path, Mode perms = Mode::Read) override;
+    VirtualDir CreateDirectory(std::string_view path, Mode perms = Mode::ReadWrite) override;
+    VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path) override;
+    VirtualDir MoveDirectory(std::string_view old_path, std::string_view new_path) override;
+    bool DeleteDirectory(std::string_view path) override;
+
+private:
+    boost::container::flat_map<std::string, std::weak_ptr<FileUtil::IOFile>> cache;
+};
+
 // An implmentation of VfsFile that represents a file on the user's computer.
-struct RealVfsFile : public VfsFile {
-    friend struct RealVfsDirectory;
+class RealVfsFile : public VfsFile {
+    friend class RealVfsDirectory;
+    friend class RealVfsFilesystem;
 
-    RealVfsFile(const std::string& name, Mode perms = Mode::Read);
+    RealVfsFile(RealVfsFilesystem& base, std::shared_ptr<FileUtil::IOFile> backing,
+                const std::string& path, Mode perms = Mode::Read);
 
+public:
     std::string GetName() const override;
     size_t GetSize() const override;
     bool Resize(size_t new_size) override;
@@ -31,7 +58,8 @@ struct RealVfsFile : public VfsFile {
 private:
     bool Close();
 
-    FileUtil::IOFile backing;
+    RealVfsFilesystem& base;
+    std::shared_ptr<FileUtil::IOFile> backing;
     std::string path;
     std::string parent_path;
     std::vector<std::string> path_components;
@@ -40,9 +68,19 @@ private:
 };
 
 // An implementation of VfsDirectory that represents a directory on the user's computer.
-struct RealVfsDirectory : public VfsDirectory {
-    RealVfsDirectory(const std::string& path, Mode perms = Mode::Read);
+class RealVfsDirectory : public VfsDirectory {
+    friend class RealVfsFilesystem;
 
+    RealVfsDirectory(RealVfsFilesystem& base, const std::string& path, Mode perms = Mode::Read);
+
+public:
+    std::shared_ptr<VfsFile> GetFileRelative(std::string_view path) const override;
+    std::shared_ptr<VfsDirectory> GetDirectoryRelative(std::string_view path) const override;
+    std::shared_ptr<VfsFile> GetFile(std::string_view name) const override;
+    std::shared_ptr<VfsDirectory> GetSubdirectory(std::string_view name) const override;
+    std::shared_ptr<VfsFile> CreateFileRelative(std::string_view path) override;
+    std::shared_ptr<VfsDirectory> CreateDirectoryRelative(std::string_view path) override;
+    bool DeleteSubdirectoryRecursive(std::string_view name) override;
     std::vector<std::shared_ptr<VfsFile>> GetFiles() const override;
     std::vector<std::shared_ptr<VfsDirectory>> GetSubdirectories() const override;
     bool IsWritable() const override;
@@ -60,13 +98,15 @@ protected:
     bool ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) override;
 
 private:
+    template <typename T, typename R>
+    std::vector<std::shared_ptr<R>> IterateEntries() const;
+
+    RealVfsFilesystem& base;
     std::string path;
     std::string parent_path;
     std::vector<std::string> path_components;
     std::vector<std::string> parent_components;
     Mode perms;
-    std::vector<std::shared_ptr<VfsFile>> files;
-    std::vector<std::shared_ptr<VfsDirectory>> subdirectories;
 };
 
 } // namespace FileSys

src/core/hle/kernel/hle_ipc.cpp

@@ -201,7 +201,7 @@ ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(u32_le* src_cmdb
     return RESULT_SUCCESS;
 }
 
-ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(Thread& thread) {
+ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(const Thread& thread) {
     std::array<u32, IPC::COMMAND_BUFFER_LENGTH> dst_cmdbuf;
     Memory::ReadBlock(*thread.owner_process, thread.GetTLSAddress(), dst_cmdbuf.data(),
                       dst_cmdbuf.size() * sizeof(u32));

src/core/hle/kernel/hle_ipc.h

@@ -132,7 +132,7 @@ public:
     ResultCode PopulateFromIncomingCommandBuffer(u32_le* src_cmdbuf, Process& src_process,
                                                  HandleTable& src_table);
     /// Writes data from this context back to the requesting process/thread.
-    ResultCode WriteToOutgoingCommandBuffer(Thread& thread);
+    ResultCode WriteToOutgoingCommandBuffer(const Thread& thread);
 
     u32_le GetCommand() const {
         return command;

src/core/hle/service/filesystem/filesystem.cpp

@@ -59,7 +59,7 @@ ResultCode VfsDirectoryServiceWrapper::CreateFile(const std::string& path_, u64
 ResultCode VfsDirectoryServiceWrapper::DeleteFile(const std::string& path_) const {
     std::string path(FileUtil::SanitizePath(path_));
     auto dir = GetDirectoryRelativeWrapped(backing, FileUtil::GetParentPath(path));
-    if (path == "/" || path == "\\") {
+    if (path.empty()) {
         // TODO(DarkLordZach): Why do games call this and what should it do? Works as is but...
         return RESULT_SUCCESS;
     }
@@ -281,15 +281,15 @@ ResultVal<FileSys::VirtualDir> OpenSDMC() {
     return sdmc_factory->Open();
 }
 
-void RegisterFileSystems() {
+void RegisterFileSystems(const FileSys::VirtualFilesystem& vfs) {
     romfs_factory = nullptr;
     save_data_factory = nullptr;
     sdmc_factory = nullptr;
 
-    auto nand_directory = std::make_shared<FileSys::RealVfsDirectory>(
-        FileUtil::GetUserPath(FileUtil::UserPath::NANDDir), FileSys::Mode::ReadWrite);
-    auto sd_directory = std::make_shared<FileSys::RealVfsDirectory>(
-        FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir), FileSys::Mode::ReadWrite);
+    auto nand_directory = vfs->OpenDirectory(FileUtil::GetUserPath(FileUtil::UserPath::NANDDir),
+                                             FileSys::Mode::ReadWrite);
+    auto sd_directory = vfs->OpenDirectory(FileUtil::GetUserPath(FileUtil::UserPath::SDMCDir),
+                                           FileSys::Mode::ReadWrite);
 
     auto savedata = std::make_unique<FileSys::SaveDataFactory>(std::move(nand_directory));
     save_data_factory = std::move(savedata);
@@ -298,8 +298,8 @@ void RegisterFileSystems() {
     sdmc_factory = std::move(sdcard);
 }
 
-void InstallInterfaces(SM::ServiceManager& service_manager) {
-    RegisterFileSystems();
+void InstallInterfaces(SM::ServiceManager& service_manager, const FileSys::VirtualFilesystem& vfs) {
+    RegisterFileSystems(vfs);
     std::make_shared<FSP_LDR>()->InstallAsService(service_manager);
     std::make_shared<FSP_PR>()->InstallAsService(service_manager);
     std::make_shared<FSP_SRV>()->InstallAsService(service_manager);

src/core/hle/service/filesystem/filesystem.h

@@ -36,7 +36,7 @@ ResultVal<FileSys::VirtualDir> OpenSDMC();
 // ResultVal<std::unique_ptr<FileSys::FileSystemBackend>> OpenBIS();
 
 /// Registers all Filesystem services with the specified service manager.
-void InstallInterfaces(SM::ServiceManager& service_manager);
+void InstallInterfaces(SM::ServiceManager& service_manager, const FileSys::VirtualFilesystem& vfs);
 
 // A class that wraps a VfsDirectory with methods that return ResultVal and ResultCode instead of
 // pointers and booleans. This makes using a VfsDirectory with switch services much easier and

src/core/hle/service/filesystem/fsp_srv.cpp

@@ -193,13 +193,10 @@ private:
 template <typename T>
 static void BuildEntryIndex(std::vector<FileSys::Entry>& entries, const std::vector<T>& new_data,
                             FileSys::EntryType type) {
+    entries.reserve(entries.size() + new_data.size());
+
     for (const auto& new_entry : new_data) {
-        FileSys::Entry entry;
-        entry.filename[0] = '\0';
-        std::strncat(entry.filename, new_entry->GetName().c_str(), FileSys::FILENAME_LENGTH - 1);
-        entry.type = type;
-        entry.file_size = new_entry->GetSize();
-        entries.emplace_back(std::move(entry));
+        entries.emplace_back(new_entry->GetName(), type, new_entry->GetSize());
     }
 }
 

src/core/hle/service/nvflinger/buffer_queue.cpp

@@ -16,7 +16,7 @@ BufferQueue::BufferQueue(u32 id, u64 layer_id) : id(id), layer_id(layer_id) {
         Kernel::Event::Create(Kernel::ResetType::Sticky, "BufferQueue NativeHandle");
 }
 
-void BufferQueue::SetPreallocatedBuffer(u32 slot, IGBPBuffer& igbp_buffer) {
+void BufferQueue::SetPreallocatedBuffer(u32 slot, const IGBPBuffer& igbp_buffer) {
     Buffer buffer{};
     buffer.slot = slot;
     buffer.igbp_buffer = igbp_buffer;

src/core/hle/service/nvflinger/buffer_queue.h

@@ -72,7 +72,7 @@ public:
         MathUtil::Rectangle<int> crop_rect;
     };
 
-    void SetPreallocatedBuffer(u32 slot, IGBPBuffer& buffer);
+    void SetPreallocatedBuffer(u32 slot, const IGBPBuffer& igbp_buffer);
     boost::optional<u32> DequeueBuffer(u32 width, u32 height);
     const IGBPBuffer& RequestBuffer(u32 slot) const;
     void QueueBuffer(u32 slot, BufferTransformFlags transform,

src/core/hle/service/service.cpp

@@ -198,7 +198,7 @@ void AddNamedPort(std::string name, SharedPtr<ClientPort> port) {
 }
 
 /// Initialize ServiceManager
-void Init(std::shared_ptr<SM::ServiceManager>& sm) {
+void Init(std::shared_ptr<SM::ServiceManager>& sm, const FileSys::VirtualFilesystem& rfs) {
     // NVFlinger needs to be accessed by several services like Vi and AppletOE so we instantiate it
     // here and pass it into the respective InstallInterfaces functions.
     auto nv_flinger = std::make_shared<NVFlinger::NVFlinger>();
@@ -221,7 +221,7 @@ void Init(std::shared_ptr<SM::ServiceManager>& sm) {
     EUPLD::InstallInterfaces(*sm);
     Fatal::InstallInterfaces(*sm);
     FGM::InstallInterfaces(*sm);
-    FileSystem::InstallInterfaces(*sm);
+    FileSystem::InstallInterfaces(*sm, rfs);
     Friend::InstallInterfaces(*sm);
     GRC::InstallInterfaces(*sm);
     HID::InstallInterfaces(*sm);

src/core/hle/service/service.h

@@ -22,6 +22,10 @@ class ServerSession;
 class HLERequestContext;
 } // namespace Kernel
 
+namespace FileSys {
+struct VfsFilesystem;
+}
+
 namespace Service {
 
 namespace SM {
@@ -177,7 +181,8 @@ private:
 };
 
 /// Initialize ServiceManager
-void Init(std::shared_ptr<SM::ServiceManager>& sm);
+void Init(std::shared_ptr<SM::ServiceManager>& sm,
+          const std::shared_ptr<FileSys::VfsFilesystem>& vfs);
 
 /// Shutdown ServiceManager
 void Shutdown();

src/core/loader/loader.cpp

@@ -43,10 +43,6 @@ FileType IdentifyFile(FileSys::VirtualFile file) {
     return FileType::Unknown;
 }
 
-FileType IdentifyFile(const std::string& file_name) {
-    return IdentifyFile(std::make_shared<FileSys::RealVfsFile>(file_name));
-}
-
 FileType GuessFromFilename(const std::string& name) {
     if (name == "main")
         return FileType::DeconstructedRomDirectory;

src/core/loader/loader.h

@@ -42,14 +42,6 @@ enum class FileType {
  */
 FileType IdentifyFile(FileSys::VirtualFile file);
 
-/**
- * Identifies the type of a bootable file based on the magic value in its header.
- * @param file_name path to file
- * @return FileType of file. Note: this will return FileType::Unknown if it is unable to determine
- * a filetype, and will never return FileType::Error.
- */
-FileType IdentifyFile(const std::string& file_name);
-
 /**
  * Guess the type of a bootable file from its name
  * @param name String name of bootable file

src/video_core/engines/maxwell_3d.cpp

@@ -23,12 +23,17 @@ Maxwell3D::Maxwell3D(VideoCore::RasterizerInterface& rasterizer, MemoryManager&
     : memory_manager(memory_manager), rasterizer{rasterizer}, macro_interpreter(*this) {}
 
 void Maxwell3D::CallMacroMethod(u32 method, std::vector<u32> parameters) {
-    auto macro_code = uploaded_macros.find(method);
-    // The requested macro must have been uploaded already.
-    ASSERT_MSG(macro_code != uploaded_macros.end(), "Macro %08X was not uploaded", method);
-
-    // Reset the current macro and execute it.
+    // Reset the current macro.
     executing_macro = 0;
+
+    // The requested macro must have been uploaded already.
+    auto macro_code = uploaded_macros.find(method);
+    if (macro_code == uploaded_macros.end()) {
+        LOG_ERROR(HW_GPU, "Macro {:04X} was not uploaded", method);
+        return;
+    }
+
+    // Execute the current macro.
     macro_interpreter.Execute(macro_code->second, std::move(parameters));
 }
 

src/video_core/gpu.h

@@ -34,6 +34,7 @@ enum class RenderTargetFormat : u32 {
     RG16_FLOAT = 0xDE,
     R11G11B10_FLOAT = 0xE0,
     R32_FLOAT = 0xE5,
+    B5G6R5_UNORM = 0xE8,
     R16_FLOAT = 0xF2,
     R8_UNORM = 0xF3,
 };

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -324,6 +324,11 @@ std::pair<Surface, Surface> RasterizerOpenGL::ConfigureFramebuffers(bool using_c
                                                                     bool using_depth_fb) {
     const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs;
 
+    if (regs.rt[0].format == Tegra::RenderTargetFormat::NONE) {
+        LOG_ERROR(HW_GPU, "RenderTargetFormat is not configured");
+        using_color_fb = false;
+    }
+
     // TODO(bunnei): Implement this
     const bool has_stencil = false;
 

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -109,6 +109,9 @@ static constexpr std::array<FormatTuple, SurfaceParams::MaxPixelFormat> tex_form
     {GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, ComponentType::UNorm,
      true},                                                                                 // DXT45
     {GL_COMPRESSED_RED_RGTC1, GL_RED, GL_UNSIGNED_INT_8_8_8_8, ComponentType::UNorm, true}, // DXN1
+    {GL_COMPRESSED_RG_RGTC2, GL_RG, GL_UNSIGNED_INT_8_8_8_8, ComponentType::UNorm,
+     true},                                                                     // DXN2UNORM
+    {GL_COMPRESSED_SIGNED_RG_RGTC2, GL_RG, GL_INT, ComponentType::SNorm, true}, // DXN2SNORM
     {GL_COMPRESSED_RGBA_BPTC_UNORM_ARB, GL_RGB, GL_UNSIGNED_INT_8_8_8_8, ComponentType::UNorm,
      true},                                                                    // BC7U
     {GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, ComponentType::UNorm, false},        // ASTC_2D_4X4
@@ -181,35 +184,37 @@ MathUtil::Rectangle<u32> SurfaceParams::GetRect() const {
 }
 
 template <bool morton_to_gl, PixelFormat format>
-void MortonCopy(u32 stride, u32 block_height, u32 height, u8* gl_buffer, Tegra::GPUVAddr addr) {
+void MortonCopy(u32 stride, u32 block_height, u32 height, std::vector<u8>& gl_buffer,
+                Tegra::GPUVAddr addr) {
     constexpr u32 bytes_per_pixel = SurfaceParams::GetFormatBpp(format) / CHAR_BIT;
     constexpr u32 gl_bytes_per_pixel = CachedSurface::GetGLBytesPerPixel(format);
     const auto& gpu = Core::System::GetInstance().GPU();
 
     if (morton_to_gl) {
+        std::vector<u8> data;
         if (SurfaceParams::GetFormatType(format) == SurfaceType::ColorTexture) {
-            auto data = Tegra::Texture::UnswizzleTexture(
+            data = Tegra::Texture::UnswizzleTexture(
                 *gpu.memory_manager->GpuToCpuAddress(addr),
                 SurfaceParams::TextureFormatFromPixelFormat(format), stride, height, block_height);
-            std::memcpy(gl_buffer, data.data(), data.size());
         } else {
-            auto data = Tegra::Texture::UnswizzleDepthTexture(
+            data = Tegra::Texture::UnswizzleDepthTexture(
                 *gpu.memory_manager->GpuToCpuAddress(addr),
                 SurfaceParams::DepthFormatFromPixelFormat(format), stride, height, block_height);
-            std::memcpy(gl_buffer, data.data(), data.size());
         }
+        const size_t size_to_copy{std::min(gl_buffer.size(), data.size())};
+        gl_buffer.assign(data.begin(), data.begin() + size_to_copy);
     } else {
         // TODO(bunnei): Assumes the default rendering GOB size of 16 (128 lines). We should
         // check the configuration for this and perform more generic un/swizzle
         LOG_WARNING(Render_OpenGL, "need to use correct swizzle/GOB parameters!");
         VideoCore::MortonCopyPixels128(
             stride, height, bytes_per_pixel, gl_bytes_per_pixel,
-            Memory::GetPointer(*gpu.memory_manager->GpuToCpuAddress(addr)), gl_buffer,
+            Memory::GetPointer(*gpu.memory_manager->GpuToCpuAddress(addr)), gl_buffer.data(),
             morton_to_gl);
     }
 }
 
-static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr),
+static constexpr std::array<void (*)(u32, u32, u32, std::vector<u8>&, Tegra::GPUVAddr),
                             SurfaceParams::MaxPixelFormat>
     morton_to_gl_fns = {
         MortonCopy<true, PixelFormat::ABGR8>,        MortonCopy<true, PixelFormat::B5G6R5>,
@@ -218,6 +223,7 @@ static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr),
         MortonCopy<true, PixelFormat::R11FG11FB10F>, MortonCopy<true, PixelFormat::RGBA32UI>,
         MortonCopy<true, PixelFormat::DXT1>,         MortonCopy<true, PixelFormat::DXT23>,
         MortonCopy<true, PixelFormat::DXT45>,        MortonCopy<true, PixelFormat::DXN1>,
+        MortonCopy<true, PixelFormat::DXN2UNORM>,    MortonCopy<true, PixelFormat::DXN2SNORM>,
         MortonCopy<true, PixelFormat::BC7U>,         MortonCopy<true, PixelFormat::ASTC_2D_4X4>,
         MortonCopy<true, PixelFormat::G8R8>,         MortonCopy<true, PixelFormat::BGRA8>,
         MortonCopy<true, PixelFormat::RGBA32F>,      MortonCopy<true, PixelFormat::RG32F>,
@@ -231,7 +237,7 @@ static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr),
         MortonCopy<true, PixelFormat::Z32FS8>,
 };
 
-static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr),
+static constexpr std::array<void (*)(u32, u32, u32, std::vector<u8>&, Tegra::GPUVAddr),
                             SurfaceParams::MaxPixelFormat>
     gl_to_morton_fns = {
         MortonCopy<false, PixelFormat::ABGR8>,
@@ -242,7 +248,10 @@ static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr),
         MortonCopy<false, PixelFormat::RGBA16F>,
         MortonCopy<false, PixelFormat::R11FG11FB10F>,
         MortonCopy<false, PixelFormat::RGBA32UI>,
-        // TODO(Subv): Swizzling DXT1/DXT23/DXT45/DXN1/BC7U/ASTC_2D_4X4 formats is not supported
+        // TODO(Subv): Swizzling DXT1/DXT23/DXT45/DXN1/DXN2/BC7U/ASTC_2D_4X4 formats is not
+        // supported
+        nullptr,
+        nullptr,
         nullptr,
         nullptr,
         nullptr,
@@ -447,22 +456,24 @@ MICROPROFILE_DEFINE(OpenGL_SurfaceLoad, "OpenGL", "Surface Load", MP_RGB(128, 64
 void CachedSurface::LoadGLBuffer() {
     ASSERT(params.type != SurfaceType::Fill);
 
-    u8* const texture_src_data = Memory::GetPointer(params.GetCpuAddr());
+    const u8* const texture_src_data = Memory::GetPointer(params.GetCpuAddr());
 
     ASSERT(texture_src_data);
 
-    gl_buffer.resize(params.width * params.height * GetGLBytesPerPixel(params.pixel_format));
+    const u32 bytes_per_pixel = GetGLBytesPerPixel(params.pixel_format);
+    const u32 copy_size = params.width * params.height * bytes_per_pixel;
 
     MICROPROFILE_SCOPE(OpenGL_SurfaceLoad);
 
-    if (!params.is_tiled) {
-        const u32 bytes_per_pixel{params.GetFormatBpp() >> 3};
+    if (params.is_tiled) {
+        gl_buffer.resize(copy_size);
 
-        std::memcpy(gl_buffer.data(), texture_src_data,
-                    bytes_per_pixel * params.width * params.height);
-    } else {
         morton_to_gl_fns[static_cast<size_t>(params.pixel_format)](
-            params.width, params.block_height, params.height, gl_buffer.data(), params.addr);
+            params.width, params.block_height, params.height, gl_buffer, params.addr);
+    } else {
+        const u8* const texture_src_data_end = texture_src_data + copy_size;
+
+        gl_buffer.assign(texture_src_data, texture_src_data_end);
     }
 
     ConvertFormatAsNeeded_LoadGLBuffer(gl_buffer, params.pixel_format, params.width, params.height);
@@ -485,7 +496,7 @@ void CachedSurface::FlushGLBuffer() {
         std::memcpy(dst_buffer, gl_buffer.data(), params.size_in_bytes);
     } else {
         gl_to_morton_fns[static_cast<size_t>(params.pixel_format)](
-            params.width, params.block_height, params.height, gl_buffer.data(), params.addr);
+            params.width, params.block_height, params.height, gl_buffer, params.addr);
     }
 }
 
@@ -757,10 +768,12 @@ void RasterizerCacheOpenGL::FlushRegion(Tegra::GPUVAddr /*addr*/, size_t /*size*
 }
 
 void RasterizerCacheOpenGL::InvalidateRegion(Tegra::GPUVAddr addr, size_t size) {
-    for (const auto& pair : surface_cache) {
-        const auto& surface{pair.second};
+    for (auto iter = surface_cache.cbegin(); iter != surface_cache.cend();) {
+        const auto& surface{iter->second};
         const auto& params{surface->GetSurfaceParams()};
 
+        ++iter;
+
         if (params.IsOverlappingRegion(addr, size)) {
             UnregisterSurface(surface);
         }

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -35,31 +35,33 @@ struct SurfaceParams {
         DXT23 = 9,
         DXT45 = 10,
         DXN1 = 11, // This is also known as BC4
-        BC7U = 12,
-        ASTC_2D_4X4 = 13,
-        G8R8 = 14,
-        BGRA8 = 15,
-        RGBA32F = 16,
-        RG32F = 17,
-        R32F = 18,
-        R16F = 19,
-        R16UNORM = 20,
-        RG16 = 21,
-        RG16F = 22,
-        RG16UI = 23,
-        RG16I = 24,
-        RG16S = 25,
-        RGB32F = 26,
-        SRGBA8 = 27,
+        DXN2UNORM = 12,
+        DXN2SNORM = 13,
+        BC7U = 14,
+        ASTC_2D_4X4 = 15,
+        G8R8 = 16,
+        BGRA8 = 17,
+        RGBA32F = 18,
+        RG32F = 19,
+        R32F = 20,
+        R16F = 21,
+        R16UNORM = 22,
+        RG16 = 23,
+        RG16F = 24,
+        RG16UI = 25,
+        RG16I = 26,
+        RG16S = 27,
+        RGB32F = 28,
+        SRGBA8 = 29,
 
         MaxColorFormat,
 
         // DepthStencil formats
-        Z24S8 = 28,
-        S8Z24 = 29,
-        Z32F = 30,
-        Z16 = 31,
-        Z32FS8 = 32,
+        Z24S8 = 30,
+        S8Z24 = 31,
+        Z32F = 32,
+        Z16 = 33,
+        Z32FS8 = 34,
 
         MaxDepthStencilFormat,
 
@@ -109,6 +111,8 @@ struct SurfaceParams {
             4, // DXT23
             4, // DXT45
             4, // DXN1
+            4, // DXN2UNORM
+            4, // DXN2SNORM
             4, // BC7U
             4, // ASTC_2D_4X4
             1, // G8R8
@@ -153,6 +157,8 @@ struct SurfaceParams {
             128, // DXT23
             128, // DXT45
             64,  // DXN1
+            128, // DXN2UNORM
+            128, // DXN2SNORM
             128, // BC7U
             32,  // ASTC_2D_4X4
             16,  // G8R8
@@ -221,6 +227,8 @@ struct SurfaceParams {
             return PixelFormat::RG32F;
         case Tegra::RenderTargetFormat::R11G11B10_FLOAT:
             return PixelFormat::R11FG11FB10F;
+        case Tegra::RenderTargetFormat::B5G6R5_UNORM:
+            return PixelFormat::B5G6R5;
         case Tegra::RenderTargetFormat::RGBA32_UINT:
             return PixelFormat::RGBA32UI;
         case Tegra::RenderTargetFormat::R8_UNORM:
@@ -303,6 +311,16 @@ struct SurfaceParams {
             return PixelFormat::DXT45;
         case Tegra::Texture::TextureFormat::DXN1:
             return PixelFormat::DXN1;
+        case Tegra::Texture::TextureFormat::DXN2:
+            switch (component_type) {
+            case Tegra::Texture::ComponentType::UNORM:
+                return PixelFormat::DXN2UNORM;
+            case Tegra::Texture::ComponentType::SNORM:
+                return PixelFormat::DXN2SNORM;
+            }
+            LOG_CRITICAL(HW_GPU, "Unimplemented component_type={}",
+                         static_cast<u32>(component_type));
+            UNREACHABLE();
         case Tegra::Texture::TextureFormat::BC7U:
             return PixelFormat::BC7U;
         case Tegra::Texture::TextureFormat::ASTC_2D_4X4:
@@ -360,6 +378,9 @@ struct SurfaceParams {
             return Tegra::Texture::TextureFormat::DXT45;
         case PixelFormat::DXN1:
             return Tegra::Texture::TextureFormat::DXN1;
+        case PixelFormat::DXN2UNORM:
+        case PixelFormat::DXN2SNORM:
+            return Tegra::Texture::TextureFormat::DXN2;
         case PixelFormat::BC7U:
             return Tegra::Texture::TextureFormat::BC7U;
         case PixelFormat::ASTC_2D_4X4:
@@ -441,6 +462,7 @@ struct SurfaceParams {
         case Tegra::RenderTargetFormat::RGB10_A2_UNORM:
         case Tegra::RenderTargetFormat::R8_UNORM:
         case Tegra::RenderTargetFormat::RG16_UNORM:
+        case Tegra::RenderTargetFormat::B5G6R5_UNORM:
             return ComponentType::UNorm;
         case Tegra::RenderTargetFormat::RG16_SNORM:
             return ComponentType::SNorm;

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -507,6 +507,8 @@ private:
 
     /// Build the GLSL register list.
     void BuildRegisterList() {
+        regs.reserve(Register::NumRegisters);
+
         for (size_t index = 0; index < Register::NumRegisters; ++index) {
             regs.emplace_back(index, suffix);
         }

src/video_core/renderer_opengl/maxwell_to_gl.h

@@ -31,6 +31,7 @@ inline GLenum VertexType(Maxwell::VertexAttribute attrib) {
         case Maxwell::VertexAttribute::Size::Size_8_8_8_8:
             return GL_UNSIGNED_BYTE;
         case Maxwell::VertexAttribute::Size::Size_16_16:
+        case Maxwell::VertexAttribute::Size::Size_16_16_16_16:
             return GL_UNSIGNED_SHORT;
         case Maxwell::VertexAttribute::Size::Size_10_10_10_2:
             return GL_UNSIGNED_INT_2_10_10_10_REV;
@@ -85,6 +86,8 @@ inline GLenum IndexFormat(Maxwell::IndexFormat index_format) {
 
 inline GLenum PrimitiveTopology(Maxwell::PrimitiveTopology topology) {
     switch (topology) {
+    case Maxwell::PrimitiveTopology::Points:
+        return GL_POINTS;
     case Maxwell::PrimitiveTopology::Triangles:
         return GL_TRIANGLES;
     case Maxwell::PrimitiveTopology::TriangleStrip:

src/video_core/textures/decoders.cpp

@@ -54,6 +54,7 @@ u32 BytesPerPixel(TextureFormat format) {
         return 8;
     case TextureFormat::DXT23:
     case TextureFormat::DXT45:
+    case TextureFormat::DXN2:
     case TextureFormat::BC7U:
         // In this case a 'pixel' actually refers to a 4x4 tile.
         return 16;
@@ -113,6 +114,7 @@ std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width,
     case TextureFormat::DXT23:
     case TextureFormat::DXT45:
     case TextureFormat::DXN1:
+    case TextureFormat::DXN2:
     case TextureFormat::BC7U:
         // In the DXT and DXN formats, each 4x4 tile is swizzled instead of just individual pixel
         // values.
@@ -179,6 +181,7 @@ std::vector<u8> DecodeTexture(const std::vector<u8>& texture_data, TextureFormat
     case TextureFormat::DXT23:
     case TextureFormat::DXT45:
     case TextureFormat::DXN1:
+    case TextureFormat::DXN2:
     case TextureFormat::BC7U:
     case TextureFormat::ASTC_2D_4X4:
     case TextureFormat::A8R8G8B8:

src/yuzu/game_list.cpp

@@ -15,6 +15,7 @@
 #include "common/string_util.h"
 #include "core/file_sys/content_archive.h"
 #include "core/file_sys/control_metadata.h"
+#include "core/file_sys/romfs.h"
 #include "core/file_sys/vfs_real.h"
 #include "core/loader/loader.h"
 #include "game_list.h"
@@ -197,7 +198,8 @@ void GameList::onFilterCloseClicked() {
     main_window->filterBarSetChecked(false);
 }
 
-GameList::GameList(GMainWindow* parent) : QWidget{parent} {
+GameList::GameList(FileSys::VirtualFilesystem vfs, GMainWindow* parent)
+    : QWidget{parent}, vfs(std::move(vfs)) {
     watcher = new QFileSystemWatcher(this);
     connect(watcher, &QFileSystemWatcher::directoryChanged, this, &GameList::RefreshGameDirectory);
 
@@ -341,7 +343,7 @@ void GameList::PopulateAsync(const QString& dir_path, bool deep_scan) {
 
     emit ShouldCancelWorker();
 
-    GameListWorker* worker = new GameListWorker(dir_path, deep_scan);
+    GameListWorker* worker = new GameListWorker(vfs, dir_path, deep_scan);
 
     connect(worker, &GameListWorker::EntryReady, this, &GameList::AddEntry, Qt::QueuedConnection);
     connect(worker, &GameListWorker::Finished, this, &GameList::DonePopulating,
@@ -414,8 +416,8 @@ void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, unsign
         bool is_dir = FileUtil::IsDirectory(physical_name);
         QFileInfo file_info(physical_name.c_str());
         if (!is_dir && file_info.suffix().toStdString() == "nca") {
-            auto nca = std::make_shared<FileSys::NCA>(
-                std::make_shared<FileSys::RealVfsFile>(physical_name));
+            auto nca =
+                std::make_shared<FileSys::NCA>(vfs->OpenFile(physical_name, FileSys::Mode::Read));
             if (nca->GetType() == FileSys::NCAContentType::Control)
                 nca_control_map.insert_or_assign(nca->GetTitleId(), nca);
         }
@@ -436,7 +438,7 @@ void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, unsign
         if (!is_dir &&
             (HasSupportedFileExtension(physical_name) || IsExtractedNCAMain(physical_name))) {
             std::unique_ptr<Loader::AppLoader> loader =
-                Loader::GetLoader(std::make_shared<FileSys::RealVfsFile>(physical_name));
+                Loader::GetLoader(vfs->OpenFile(physical_name, FileSys::Mode::Read));
             if (!loader || ((loader->GetFileType() == Loader::FileType::Unknown ||
                              loader->GetFileType() == Loader::FileType::Error) &&
                             !UISettings::values.show_unknown))
@@ -459,7 +461,7 @@ void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, unsign
                 // Use from metadata pool.
                 if (nca_control_map.find(program_id) != nca_control_map.end()) {
                     const auto nca = nca_control_map[program_id];
-                    const auto control_dir = nca->GetSubdirectories()[0];
+                    const auto control_dir = FileSys::ExtractRomFS(nca->GetRomFS());
 
                     const auto nacp_file = control_dir->GetFile("control.nacp");
                     FileSys::NACP nacp(nacp_file);

src/yuzu/game_list.h

@@ -59,7 +59,7 @@ public:
         QToolButton* button_filter_close = nullptr;
     };
 
-    explicit GameList(GMainWindow* parent = nullptr);
+    explicit GameList(FileSys::VirtualFilesystem vfs, GMainWindow* parent = nullptr);
     ~GameList() override;
 
     void clearFilter();
@@ -90,6 +90,7 @@ private:
     void PopupContextMenu(const QPoint& menu_location);
     void RefreshGameDirectory();
 
+    FileSys::VirtualFilesystem vfs;
     SearchField* search_field;
     GMainWindow* main_window = nullptr;
     QVBoxLayout* layout = nullptr;

src/yuzu/game_list_p.h

@@ -139,8 +139,8 @@ class GameListWorker : public QObject, public QRunnable {
     Q_OBJECT
 
 public:
-    GameListWorker(QString dir_path, bool deep_scan)
-        : dir_path(std::move(dir_path)), deep_scan(deep_scan) {}
+    GameListWorker(FileSys::VirtualFilesystem vfs, QString dir_path, bool deep_scan)
+        : vfs(std::move(vfs)), dir_path(std::move(dir_path)), deep_scan(deep_scan) {}
 
 public slots:
     /// Starts the processing of directory tree information.
@@ -163,6 +163,7 @@ signals:
     void Finished(QStringList watch_list);
 
 private:
+    FileSys::VirtualFilesystem vfs;
     QStringList watch_list;
     QString dir_path;
     bool deep_scan;

src/yuzu/main.cpp

@@ -24,6 +24,7 @@
 #include "common/string_util.h"
 #include "core/core.h"
 #include "core/crypto/key_manager.h"
+#include "core/file_sys/vfs_real.h"
 #include "core/gdbstub/gdbstub.h"
 #include "core/loader/loader.h"
 #include "core/settings.h"
@@ -83,7 +84,9 @@ void GMainWindow::ShowCallouts() {}
 
 const int GMainWindow::max_recent_files_item;
 
-GMainWindow::GMainWindow() : config(new Config()), emu_thread(nullptr) {
+GMainWindow::GMainWindow()
+    : config(new Config()), emu_thread(nullptr),
+      vfs(std::make_shared<FileSys::RealVfsFilesystem>()) {
 
     debug_context = Tegra::DebugContext::Construct();
 
@@ -132,7 +135,7 @@ void GMainWindow::InitializeWidgets() {
     render_window = new GRenderWindow(this, emu_thread.get());
     render_window->hide();
 
-    game_list = new GameList(this);
+    game_list = new GameList(vfs, this);
     ui.horizontalLayout->addWidget(game_list);
 
     // Create status bar
@@ -406,6 +409,7 @@ bool GMainWindow::LoadROM(const QString& filename) {
     }
 
     Core::System& system{Core::System::GetInstance()};
+    system.SetFilesystem(vfs);
 
     system.SetGPUDebugContext(debug_context);
 

src/yuzu/main.h

@@ -161,6 +161,9 @@ private:
     bool emulation_running = false;
     std::unique_ptr<EmuThread> emu_thread;
 
+    // FS
+    FileSys::VirtualFilesystem vfs;
+
     // Debugger panes
     ProfilerWidget* profilerWidget;
     MicroProfileDialog* microProfileDialog;

src/yuzu_cmd/yuzu.cpp

@@ -161,6 +161,7 @@ int main(int argc, char** argv) {
     }
 
     Core::System& system{Core::System::GetInstance()};
+    system.SetFilesystem(std::make_shared<FileSys::RealVfsFilesystem>());
 
     SCOPE_EXIT({ system.Shutdown(); });