Add configurable logging backends

src/common/common_paths.h

@@ -32,12 +32,15 @@
 #define SDMC_DIR "sdmc"
 #define NAND_DIR "nand"
 #define SYSDATA_DIR "sysdata"
+#define LOG_DIR "log"
 
 // Filenames
 // Files in the directory returned by GetUserPath(D_CONFIG_IDX)
 #define EMU_CONFIG "emu.ini"
 #define DEBUGGER_CONFIG "debugger.ini"
 #define LOGGER_CONFIG "logger.ini"
+// Files in the directory returned by GetUserPath(D_LOGS_IDX)
+#define LOG_FILE "citra_log.txt"
 
 // Sys files
 #define SHARED_FONT "shared_font.bin"

src/common/file_util.cpp

@@ -713,6 +713,8 @@ const std::string& GetUserPath(const unsigned int DirIDX, const std::string& new
         paths[D_SDMC_IDX] = paths[D_USER_IDX] + SDMC_DIR DIR_SEP;
         paths[D_NAND_IDX] = paths[D_USER_IDX] + NAND_DIR DIR_SEP;
         paths[D_SYSDATA_IDX] = paths[D_USER_IDX] + SYSDATA_DIR DIR_SEP;
+        // TODO: Put the logs in a better location for each OS
+        paths[D_LOGS_IDX] = paths[D_USER_IDX] + LOG_DIR DIR_SEP;
     }
 
     if (!newPath.empty()) {
@@ -799,8 +801,8 @@ void SplitFilename83(const std::string& filename, std::array<char, 9>& short_nam
 
 IOFile::IOFile() {}
 
-IOFile::IOFile(const std::string& filename, const char openmode[]) {
-    Open(filename, openmode);
+IOFile::IOFile(const std::string& filename, const char openmode[], int flags) {
+    Open(filename, openmode, flags);
 }
 
 IOFile::~IOFile() {
@@ -821,11 +823,16 @@ void IOFile::Swap(IOFile& other) noexcept {
     std::swap(m_good, other.m_good);
 }
 
-bool IOFile::Open(const std::string& filename, const char openmode[]) {
+bool IOFile::Open(const std::string& filename, const char openmode[], int flags) {
     Close();
 #ifdef _WIN32
+    if (flags != 0) {
+        m_file = _wfsopen(Common::UTF8ToUTF16W(filename).c_str(),
+                          Common::UTF8ToUTF16W(openmode).c_str(), flags);
+    } else {
         _wfopen_s(&m_file, Common::UTF8ToUTF16W(filename).c_str(),
                   Common::UTF8ToUTF16W(openmode).c_str());
+    }
 #else
     m_file = fopen(filename.c_str(), openmode);
 #endif

src/common/file_util.h

@@ -156,7 +156,10 @@ void SplitFilename83(const std::string& filename, std::array<char, 9>& short_nam
 class IOFile : public NonCopyable {
 public:
     IOFile();
-    IOFile(const std::string& filename, const char openmode[]);
+    // flags is used for windows specific file open mode flags, which
+    // allows yuzu to open the logs in shared write mode, so that the file
+    // isn't considered "locked" while yuzu is open and people can open the log file and view it
+    IOFile(const std::string& filename, const char openmode[], int flags = 0);
 
     ~IOFile();
 
@@ -165,7 +168,7 @@ public:
 
     void Swap(IOFile& other) noexcept;
 
-    bool Open(const std::string& filename, const char openmode[]);
+    bool Open(const std::string& filename, const char openmode[], int flags = 0);
     bool Close();
 
     template <typename T>
@@ -220,6 +223,10 @@ public:
         return WriteArray(&object, 1);
     }
 
+    size_t WriteString(const std::string& str) {
+        return WriteArray(str.c_str(), str.length());
+    }
+
     bool IsOpen() const {
         return nullptr != m_file;
     }

src/common/logging/backend.cpp

@@ -2,16 +2,145 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <utility>
+#include <algorithm>
+#include <array>
+#include <chrono>
+#include <condition_variable>
+#include <memory>
+#include <thread>
+#ifdef _WIN32
+#include <share.h> // For _SH_DENYWR
+#else
+#define _SH_DENYWR 0
+#endif
 #include "common/assert.h"
+#include "common/common_funcs.h" // snprintf compatibility define
 #include "common/logging/backend.h"
-#include "common/logging/filter.h"
 #include "common/logging/log.h"
 #include "common/logging/text_formatter.h"
 #include "common/string_util.h"
+#include "common/threadsafe_queue.h"
 
 namespace Log {
 
+/**
+ * Static state as a singleton.
+ */
+class Impl {
+public:
+    static Impl& Instance() {
+        static Impl backend;
+        return backend;
+    }
+
+    Impl(Impl const&) = delete;
+    const Impl& operator=(Impl const&) = delete;
+
+    void PushEntry(Entry e) {
+        std::lock_guard<std::mutex> lock(message_mutex);
+        message_queue.Push(std::move(e));
+        message_cv.notify_one();
+    }
+
+    void AddBackend(std::unique_ptr<Backend> backend) {
+        std::lock_guard<std::mutex> lock(writing_mutex);
+        backends.push_back(std::move(backend));
+    }
+
+    void RemoveBackend(const std::string& backend_name) {
+        std::lock_guard<std::mutex> lock(writing_mutex);
+        auto it = std::remove_if(backends.begin(), backends.end(), [&backend_name](const auto& i) {
+            return !strcmp(i->GetName(), backend_name.c_str());
+        });
+        backends.erase(it, backends.end());
+    }
+
+    const Filter& GetGlobalFilter() const {
+        return filter;
+    }
+
+    void SetGlobalFilter(const Filter& f) {
+        filter = f;
+    }
+
+    Backend* GetBackend(const std::string& backend_name) {
+        auto it = std::find_if(backends.begin(), backends.end(), [&backend_name](const auto& i) {
+            return !strcmp(i->GetName(), backend_name.c_str());
+        });
+        if (it == backends.end())
+            return nullptr;
+        return it->get();
+    }
+
+private:
+    Impl() {
+        backend_thread = std::thread([&] {
+            Entry entry;
+            auto write_logs = [&](Entry& e) {
+                std::lock_guard<std::mutex> lock(writing_mutex);
+                for (const auto& backend : backends) {
+                    backend->Write(e);
+                }
+            };
+            while (true) {
+                std::unique_lock<std::mutex> lock(message_mutex);
+                message_cv.wait(lock, [&] { return !running || message_queue.Pop(entry); });
+                if (!running) {
+                    break;
+                }
+                write_logs(entry);
+            }
+            // Drain the logging queue. Only writes out up to MAX_LOGS_TO_WRITE to prevent a case
+            // where a system is repeatedly spamming logs even on close.
+            constexpr int MAX_LOGS_TO_WRITE = 100;
+            int logs_written = 0;
+            while (logs_written++ < MAX_LOGS_TO_WRITE && message_queue.Pop(entry)) {
+                write_logs(entry);
+            }
+        });
+    }
+
+    ~Impl() {
+        running = false;
+        message_cv.notify_one();
+        backend_thread.join();
+    }
+
+    std::atomic_bool running{true};
+    std::mutex message_mutex, writing_mutex;
+    std::condition_variable message_cv;
+    std::thread backend_thread;
+    std::vector<std::unique_ptr<Backend>> backends;
+    Common::MPSCQueue<Log::Entry> message_queue;
+    Filter filter;
+};
+
+void ConsoleBackend::Write(const Entry& entry) {
+    PrintMessage(entry);
+}
+
+void ColorConsoleBackend::Write(const Entry& entry) {
+    PrintColoredMessage(entry);
+}
+
+// _SH_DENYWR allows read only access to the file for other programs.
+// It is #defined to 0 on other platforms
+FileBackend::FileBackend(const std::string& filename)
+    : file(filename, "w", _SH_DENYWR), bytes_written(0) {}
+
+void FileBackend::Write(const Entry& entry) {
+    // prevent logs from going over the maximum size (in case its spamming and the user doesn't
+    // know)
+    constexpr size_t MAX_BYTES_WRITTEN = 50 * 1024L * 1024L;
+    if (!file.IsOpen() || bytes_written > MAX_BYTES_WRITTEN) {
+        return;
+    }
+    bytes_written += file.WriteString(FormatLogMessage(entry) + '\n');
+    if (entry.log_level >= Level::Error) {
+        file.Flush();
+    }
+}
+
 /// Macro listing all log classes. Code should define CLS and SUB as desired before invoking this.
 #define ALL_LOG_CLASSES()                                                                          \
     CLS(Log)                                                                                       \
@@ -125,20 +254,32 @@ Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsign
     return entry;
 }
 
-static Filter* filter = nullptr;
+void SetGlobalFilter(const Filter& filter) {
+    Impl::Instance().SetGlobalFilter(filter);
+}
+
+void AddBackend(std::unique_ptr<Backend> backend) {
+    Impl::Instance().AddBackend(std::move(backend));
+}
+
+void RemoveBackend(const std::string& backend_name) {
+    Impl::Instance().RemoveBackend(backend_name);
+}
 
-void SetFilter(Filter* new_filter) {
-    filter = new_filter;
+Backend* GetBackend(const std::string& backend_name) {
+    return Impl::Instance().GetBackend(backend_name);
 }
 
 void FmtLogMessageImpl(Class log_class, Level log_level, const char* filename,
                        unsigned int line_num, const char* function, const char* format,
                        const fmt::format_args& args) {
-    if (filter && !filter->CheckMessage(log_class, log_level))
+    auto filter = Impl::Instance().GetGlobalFilter();
+    if (!filter.CheckMessage(log_class, log_level))
         return;
+
     Entry entry =
         CreateEntry(log_class, log_level, filename, line_num, function, fmt::vformat(format, args));
 
-    PrintColoredMessage(entry);
+    Impl::Instance().PushEntry(std::move(entry));
 }
 } // namespace Log

src/common/logging/backend.h

@@ -1,13 +1,15 @@
 // Copyright 2014 Citra Emulator Project
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
-
 #pragma once
 
 #include <chrono>
 #include <cstdarg>
+#include <memory>
 #include <string>
 #include <utility>
+#include "common/file_util.h"
+#include "common/logging/filter.h"
 #include "common/logging/log.h"
 
 namespace Log {
@@ -34,6 +36,80 @@ struct Entry {
     Entry& operator=(const Entry& o) = default;
 };
 
+/**
+ * Interface for logging backends. As loggers can be created and removed at runtime, this can be
+ * used by a frontend for adding a custom logging backend as needed
+ */
+class Backend {
+public:
+    virtual ~Backend() = default;
+    virtual void SetFilter(const Filter& new_filter) {
+        filter = new_filter;
+    }
+    virtual const char* GetName() const = 0;
+    virtual void Write(const Entry& entry) = 0;
+
+private:
+    Filter filter;
+};
+
+/**
+ * Backend that writes to stderr without any color commands
+ */
+class ConsoleBackend : public Backend {
+public:
+    static const char* Name() {
+        return "console";
+    }
+    const char* GetName() const override {
+        return Name();
+    }
+    void Write(const Entry& entry) override;
+};
+
+/**
+ * Backend that writes to stderr and with color
+ */
+class ColorConsoleBackend : public Backend {
+public:
+    static const char* Name() {
+        return "color_console";
+    }
+
+    const char* GetName() const override {
+        return Name();
+    }
+    void Write(const Entry& entry) override;
+};
+
+/**
+ * Backend that writes to a file passed into the constructor
+ */
+class FileBackend : public Backend {
+public:
+    explicit FileBackend(const std::string& filename);
+
+    static const char* Name() {
+        return "file";
+    }
+
+    const char* GetName() const override {
+        return Name();
+    }
+
+    void Write(const Entry& entry) override;
+
+private:
+    FileUtil::IOFile file;
+    size_t bytes_written;
+};
+
+void AddBackend(std::unique_ptr<Backend> backend);
+
+void RemoveBackend(const std::string& backend_name);
+
+Backend* GetBackend(const std::string& backend_name);
+
 /**
  * Returns the name of the passed log class as a C-string. Subclasses are separated by periods
  * instead of underscores as in the enumeration.
@@ -49,5 +125,10 @@ const char* GetLevelName(Level log_level);
 Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
                   const char* function, std::string message);
 
-void SetFilter(Filter* filter);
+/**
+ * The global filter will prevent any messages from even being processed if they are filtered. Each
+ * backend can have a filter, but if the level is lower than the global filter, the backend will
+ * never get the message
+ */
+void SetGlobalFilter(const Filter& filter);
 } // namespace Log

src/yuzu/CMakeLists.txt

@@ -30,6 +30,8 @@ add_executable(yuzu
     debugger/graphics/graphics_breakpoints_p.h
     debugger/graphics/graphics_surface.cpp
     debugger/graphics/graphics_surface.h
+    debugger/console.cpp
+    debugger/console.h
     debugger/profiler.cpp
     debugger/profiler.h
     debugger/wait_tree.cpp
@@ -81,6 +83,14 @@ if (APPLE)
     target_sources(yuzu PRIVATE ${MACOSX_ICON})
     set_target_properties(yuzu PROPERTIES MACOSX_BUNDLE TRUE)
     set_target_properties(yuzu PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/Info.plist)
+elseif(WIN32)
+    # compile as a win32 gui application instead of a console application
+    target_link_libraries(yuzu PRIVATE Qt5::WinMain)
+    if(MSVC)
+        set_target_properties(yuzu PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS")
+    elseif(MINGW)
+        set_target_properties(yuzu PROPERTIES LINK_FLAGS_RELEASE "-mwindows")
+    endif()
 endif()
 
 create_target_directory_groups(yuzu)

src/yuzu/configuration/config.cpp

@@ -160,6 +160,7 @@ void Config::ReadValues() {
     UISettings::values.confirm_before_closing = qt_config->value("confirmClose", true).toBool();
     UISettings::values.first_start = qt_config->value("firstStart", true).toBool();
     UISettings::values.callout_flags = qt_config->value("calloutFlags", 0).toUInt();
+    UISettings::values.show_console = qt_config->value("showConsole", false).toBool();
 
     qt_config->endGroup();
 }
@@ -246,7 +247,7 @@ void Config::SaveValues() {
     qt_config->setValue("confirmClose", UISettings::values.confirm_before_closing);
     qt_config->setValue("firstStart", UISettings::values.first_start);
     qt_config->setValue("calloutFlags", UISettings::values.callout_flags);
-
+    qt_config->setValue("showConsole", UISettings::values.show_console);
     qt_config->endGroup();
 }
 

src/yuzu/configuration/configure_debug.cpp

@@ -2,13 +2,26 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <QDesktopServices>
+#include <QUrl>
+#include "common/file_util.h"
+#include "common/logging/backend.h"
+#include "common/logging/filter.h"
+#include "common/logging/log.h"
+#include "core/core.h"
 #include "core/settings.h"
 #include "ui_configure_debug.h"
 #include "yuzu/configuration/configure_debug.h"
+#include "yuzu/debugger/console.h"
+#include "yuzu/ui_settings.h"
 
 ConfigureDebug::ConfigureDebug(QWidget* parent) : QWidget(parent), ui(new Ui::ConfigureDebug) {
     ui->setupUi(this);
     this->setConfiguration();
+    connect(ui->open_log_button, &QPushButton::pressed, []() {
+        QString path = QString::fromStdString(FileUtil::GetUserPath(D_LOGS_IDX));
+        QDesktopServices::openUrl(QUrl::fromLocalFile(path));
+    });
 }
 
 ConfigureDebug::~ConfigureDebug() {}
@@ -17,10 +30,19 @@ void ConfigureDebug::setConfiguration() {
     ui->toggle_gdbstub->setChecked(Settings::values.use_gdbstub);
     ui->gdbport_spinbox->setEnabled(Settings::values.use_gdbstub);
     ui->gdbport_spinbox->setValue(Settings::values.gdbstub_port);
+    ui->toggle_console->setEnabled(!Core::System::GetInstance().IsPoweredOn());
+    ui->toggle_console->setChecked(UISettings::values.show_console);
+    ui->log_filter_edit->setText(QString::fromStdString(Settings::values.log_filter));
 }
 
 void ConfigureDebug::applyConfiguration() {
     Settings::values.use_gdbstub = ui->toggle_gdbstub->isChecked();
     Settings::values.gdbstub_port = ui->gdbport_spinbox->value();
+    UISettings::values.show_console = ui->toggle_console->isChecked();
+    Settings::values.log_filter = ui->log_filter_edit->text().toStdString();
+    Debugger::ToggleConsole();
+    Log::Filter filter;
+    filter.ParseFilterString(Settings::values.log_filter);
+    Log::SetGlobalFilter(filter);
     Settings::Apply();
 }

src/yuzu/configuration/configure_debug.ui

@@ -72,6 +72,47 @@
      </item>
     </layout>
    </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Logging</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="QLabel" name="label">
+          <property name="text">
+           <string>Global Log Filter</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="log_filter_edit"/>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QCheckBox" name="toggle_console">
+          <property name="text">
+           <string>Show Log Console (Windows Only)</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="open_log_button">
+          <property name="text">
+           <string>Open Log Location</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <spacer name="verticalSpacer">
      <property name="orientation">

src/yuzu/debugger/console.cpp

@@ -0,0 +1,45 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#ifdef _WIN32
+#include <windows.h>
+
+#include <wincon.h>
+#endif
+
+#include "common/logging/backend.h"
+#include "yuzu/debugger/console.h"
+#include "yuzu/ui_settings.h"
+
+namespace Debugger {
+void ToggleConsole() {
+#if defined(_WIN32) && !defined(_DEBUG)
+    FILE* temp;
+    if (UISettings::values.show_console) {
+        if (AllocConsole()) {
+            // The first parameter for freopen_s is a out parameter, so we can just ignore it
+            freopen_s(&temp, "CONIN$", "r", stdin);
+            freopen_s(&temp, "CONOUT$", "w", stdout);
+            freopen_s(&temp, "CONOUT$", "w", stderr);
+            Log::AddBackend(std::make_unique<Log::ColorConsoleBackend>());
+        }
+    } else {
+        if (FreeConsole()) {
+            // In order to close the console, we have to also detach the streams on it.
+            // Just redirect them to NUL if there is no console window
+            Log::RemoveBackend(Log::ColorConsoleBackend::Name());
+            freopen_s(&temp, "NUL", "r", stdin);
+            freopen_s(&temp, "NUL", "w", stdout);
+            freopen_s(&temp, "NUL", "w", stderr);
+        }
+    }
+#else
+    if (UISettings::values.show_console) {
+        Log::AddBackend(std::make_unique<Log::ColorConsoleBackend>());
+    } else {
+        Log::RemoveBackend(Log::ColorConsoleBackend::Name());
+    }
+#endif
+}
+} // namespace Debugger

src/yuzu/debugger/console.h

@@ -0,0 +1,14 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace Debugger {
+
+/**
+ * Uses the WINAPI to hide or show the stderr console. This function is a placeholder until we can
+ * get a real qt logging window which would work for all platforms.
+ */
+void ToggleConsole();
+} // namespace Debugger

src/yuzu/main.cpp

@@ -31,6 +31,7 @@
 #include "yuzu/bootmanager.h"
 #include "yuzu/configuration/config.h"
 #include "yuzu/configuration/configure_dialog.h"
+#include "yuzu/debugger/console.h"
 #include "yuzu/debugger/graphics/graphics_breakpoints.h"
 #include "yuzu/debugger/graphics/graphics_surface.h"
 #include "yuzu/debugger/profiler.h"
@@ -261,6 +262,7 @@ void GMainWindow::RestoreUIState() {
 
     ui.action_Show_Status_Bar->setChecked(UISettings::values.show_status_bar);
     statusBar()->setVisible(ui.action_Show_Status_Bar->isChecked());
+    Debugger::ToggleConsole();
 }
 
 void GMainWindow::ConnectWidgetEvents() {
@@ -906,8 +908,7 @@ void GMainWindow::UpdateUITheme() {
 #endif
 
 int main(int argc, char* argv[]) {
-    Log::Filter log_filter(Log::Level::Info);
-    Log::SetFilter(&log_filter);
+    Log::AddBackend(std::make_unique<Log::ColorConsoleBackend>());
 
     MicroProfileOnThreadCreate("Frontend");
     SCOPE_EXIT({ MicroProfileShutdown(); });
@@ -925,7 +926,12 @@ int main(int argc, char* argv[]) {
 
     GMainWindow main_window;
     // After settings have been loaded by GMainWindow, apply the filter
+    Log::Filter log_filter;
     log_filter.ParseFilterString(Settings::values.log_filter);
+    Log::SetGlobalFilter(log_filter);
+    FileUtil::CreateFullPath(FileUtil::GetUserPath(D_LOGS_IDX));
+    Log::AddBackend(
+        std::make_unique<Log::FileBackend>(FileUtil::GetUserPath(D_LOGS_IDX) + LOG_FILE));
 
     main_window.show();
     return app.exec();

src/yuzu/ui_settings.h

@@ -51,6 +51,9 @@ struct Values {
     std::vector<Shortcut> shortcuts;
 
     uint32_t callout_flags;
+
+    // logging
+    bool show_console;
 };
 
 extern Values values;

src/yuzu_cmd/yuzu.cpp

@@ -126,7 +126,12 @@ int main(int argc, char** argv) {
 #endif
 
     Log::Filter log_filter(Log::Level::Debug);
-    Log::SetFilter(&log_filter);
+    Log::SetGlobalFilter(log_filter);
+
+    Log::AddBackend(std::make_unique<Log::ColorConsoleBackend>());
+    FileUtil::CreateFullPath(FileUtil::GetUserPath(D_LOGS_IDX));
+    Log::AddBackend(
+        std::make_unique<Log::FileBackend>(FileUtil::GetUserPath(D_LOGS_IDX) + LOG_FILE));
 
     MicroProfileOnThreadCreate("EmuThread");
     SCOPE_EXIT({ MicroProfileShutdown(); });