4 files changed, 381 insertions, 0 deletions
diff --git a/src/core/hle/applets/applet.cpp b/src/core/hle/applets/applet.cpp
new file mode 100644
index 00000000..826f6cbb
--- /dev/null
+++ b/src/core/hle/applets/applet.cpp
@@ -0,0 +1,101 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <unordered_map>
+
+#include "common/assert.h"
+#include "common/common_types.h"
+
+#include "core/core_timing.h"
+#include "core/hle/applets/applet.h"
+#include "core/hle/applets/swkbd.h"
+#include "core/hle/result.h"
+#include "core/hle/service/apt/apt.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+// Specializes std::hash for AppletId, so that we can use it in std::unordered_map.
+// Workaround for libstdc++ bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60970
+namespace std {
+    template <>
+    struct hash<Service::APT::AppletId> {
+        typedef Service::APT::AppletId argument_type;
+        typedef std::size_t result_type;
+
+        result_type operator()(const argument_type& id_code) const {
+            typedef std::underlying_type<argument_type>::type Type;
+            return std::hash<Type>()(static_cast<Type>(id_code));
+        }
+    };
+}
+
+namespace HLE {
+namespace Applets {
+
+static std::unordered_map<Service::APT::AppletId, std::shared_ptr<Applet>> applets;
+static u32 applet_update_event = -1; ///< The CoreTiming event identifier for the Applet update callback.
+/// The interval at which the Applet update callback will be called, 16.6ms
+static const u64 applet_update_interval_us = 16666;
+
+ResultCode Applet::Create(Service::APT::AppletId id) {
+    switch (id) {
+    case Service::APT::AppletId::SoftwareKeyboard1:
+    case Service::APT::AppletId::SoftwareKeyboard2:
+        applets[id] = std::make_shared<SoftwareKeyboard>(id);
+        break;
+    default:
+        // TODO(Subv): Find the right error code
+        return ResultCode(ErrorDescription::NotFound, ErrorModule::Applet, ErrorSummary::NotSupported, ErrorLevel::Permanent);
+    }
+
+    return RESULT_SUCCESS;
+}
+
+std::shared_ptr<Applet> Applet::Get(Service::APT::AppletId id) {
+    auto itr = applets.find(id);
+    if (itr != applets.end())
+        return itr->second;
+    return nullptr;
+}
+
+/// Handles updating the current Applet every time it's called.
+static void AppletUpdateEvent(u64 applet_id, int cycles_late) {
+    Service::APT::AppletId id = static_cast<Service::APT::AppletId>(applet_id);
+    std::shared_ptr<Applet> applet = Applet::Get(id);
+    ASSERT_MSG(applet != nullptr, "Applet doesn't exist! applet_id=%08X", id);
+
+    applet->Update();
+
+    // If the applet is still running after the last update, reschedule the event
+    if (applet->IsRunning()) {
+        CoreTiming::ScheduleEvent(usToCycles(applet_update_interval_us) - cycles_late,
+            applet_update_event, applet_id);
+    } else {
+        // Otherwise the applet has terminated, in which case we should clean it up
+        applets[id] = nullptr;
+    }
+}
+
+ResultCode Applet::Start(const Service::APT::AppletStartupParameter& parameter) {
+    ResultCode result = StartImpl(parameter);
+    if (result.IsError())
+        return result;
+    // Schedule the update event
+    CoreTiming::ScheduleEvent(usToCycles(applet_update_interval_us), applet_update_event, static_cast<u64>(id));
+    return result;
+}
+
+void Init() {
+    // Register the applet update callback
+    applet_update_event = CoreTiming::RegisterEvent("HLE Applet Update Event", AppletUpdateEvent);
+}
+
+void Shutdown() {
+}
+
+}
+} // namespace
diff --git a/src/core/hle/applets/applet.h b/src/core/hle/applets/applet.h
new file mode 100644
index 00000000..b235d0b8
--- /dev/null
+++ b/src/core/hle/applets/applet.h
@@ -0,0 +1,77 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include "core/hle/result.h"
+#include "core/hle/service/apt/apt.h"
+
+namespace HLE {
+namespace Applets {
+
+class Applet {
+public:
+    virtual ~Applet() { }
+    Applet(Service::APT::AppletId id) : id(id) { }
+
+    /**
+     * Creates an instance of the Applet subclass identified by the parameter.
+     * and stores it in a global map.
+     * @param id Id of the applet to create.
+     * @returns ResultCode Whether the operation was successful or not.
+     */
+    static ResultCode Create(Service::APT::AppletId id);
+
+    /**
+     * Retrieves the Applet instance identified by the specified id.
+     * @param id Id of the Applet to retrieve.
+     * @returns Requested Applet or nullptr if not found.
+     */
+    static std::shared_ptr<Applet> Get(Service::APT::AppletId id);
+
+    /**
+     * Handles a parameter from the application.
+     * @param parameter Parameter data to handle.
+     * @returns ResultCode Whether the operation was successful or not.
+     */
+    virtual ResultCode ReceiveParameter(const Service::APT::MessageParameter& parameter) = 0;
+
+    /**
+     * Handles the Applet start event, triggered from the application.
+     * @param parameter Parameter data to handle.
+     * @returns ResultCode Whether the operation was successful or not.
+     */
+    ResultCode Start(const Service::APT::AppletStartupParameter& parameter);
+
+    /**
+     * Whether the applet is currently executing instead of the host application or not.
+     */
+    virtual bool IsRunning() const = 0;
+
+    /**
+     * Handles an update tick for the Applet, lets it update the screen, send commands, etc.
+     */
+    virtual void Update() = 0;
+
+protected:
+    /**
+     * Handles the Applet start event, triggered from the application.
+     * @param parameter Parameter data to handle.
+     * @returns ResultCode Whether the operation was successful or not.
+     */
+    virtual ResultCode StartImpl(const Service::APT::AppletStartupParameter& parameter) = 0;
+
+    Service::APT::AppletId id; ///< Id of this Applet
+};
+
+/// Initializes the HLE applets
+void Init();
+
+/// Shuts down the HLE applets
+void Shutdown();
+
+}
+} // namespace
diff --git a/src/core/hle/applets/swkbd.cpp b/src/core/hle/applets/swkbd.cpp
new file mode 100644
index 00000000..1db6b5a1
--- /dev/null
+++ b/src/core/hle/applets/swkbd.cpp
@@ -0,0 +1,113 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstring>
+#include <string>
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/string_util.h"
+
+#include "core/hle/applets/swkbd.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/shared_memory.h"
+#include "core/hle/service/hid/hid.h"
+#include "core/hle/service/gsp_gpu.h"
+#include "core/hle/result.h"
+#include "core/memory.h"
+
+#include "video_core/video_core.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace HLE {
+namespace Applets {
+
+SoftwareKeyboard::SoftwareKeyboard(Service::APT::AppletId id) : Applet(id), started(false) {
+    // Create the SharedMemory that will hold the framebuffer data
+    // TODO(Subv): What size should we use here?
+    using Kernel::MemoryPermission;
+    framebuffer_memory = Kernel::SharedMemory::Create(0x1000, MemoryPermission::ReadWrite, MemoryPermission::ReadWrite, "SoftwareKeyboard Memory");
+}
+
+ResultCode SoftwareKeyboard::ReceiveParameter(Service::APT::MessageParameter const& parameter) {
+    if (parameter.signal != static_cast<u32>(Service::APT::SignalType::LibAppJustStarted)) {
+        LOG_ERROR(Service_APT, "unsupported signal %u", parameter.signal);
+        UNIMPLEMENTED();
+        // TODO(Subv): Find the right error code
+        return ResultCode(-1);
+    }
+
+    Service::APT::MessageParameter result;
+    // The buffer passed in parameter contains the data returned by GSPGPU::ImportDisplayCaptureInfo
+    result.signal = static_cast<u32>(Service::APT::SignalType::LibAppFinished);
+    result.data = nullptr;
+    result.buffer_size = 0;
+    result.destination_id = static_cast<u32>(Service::APT::AppletId::Application);
+    result.sender_id = static_cast<u32>(id);
+    result.object = framebuffer_memory;
+
+    Service::APT::SendParameter(result);
+    return RESULT_SUCCESS;
+}
+
+ResultCode SoftwareKeyboard::StartImpl(Service::APT::AppletStartupParameter const& parameter) {
+    ASSERT_MSG(parameter.buffer_size == sizeof(config), "The size of the parameter (SoftwareKeyboardConfig) is wrong");
+
+    memcpy(&config, parameter.data, parameter.buffer_size);
+    text_memory = boost::static_pointer_cast<Kernel::SharedMemory, Kernel::Object>(parameter.object);
+
+    // TODO(Subv): Verify if this is the correct behavior
+    memset(text_memory->GetPointer(), 0, text_memory->size);
+
+    DrawScreenKeyboard();
+
+    started = true;
+    return RESULT_SUCCESS;
+}
+
+void SoftwareKeyboard::Update() {
+    // TODO(Subv): Handle input using the touch events from the HID module
+
+    // TODO(Subv): Remove this hardcoded text
+    std::u16string text = Common::UTF8ToUTF16("Citra");
+    memcpy(text_memory->GetPointer(), text.c_str(), text.length() * sizeof(char16_t));
+
+    // TODO(Subv): Ask for input and write it to the shared memory
+    // TODO(Subv): Find out what are the possible values for the return code,
+    // some games seem to check for a hardcoded 2
+    config.return_code = 2;
+    config.text_length = 6;
+    config.text_offset = 0;
+
+    // TODO(Subv): We're finalizing the applet immediately after it's started,
+    // but we should defer this call until after all the input has been collected.
+    Finalize();
+}
+
+void SoftwareKeyboard::DrawScreenKeyboard() {
+    auto bottom_screen = GSP_GPU::GetFrameBufferInfo(0, 1);
+    auto info = bottom_screen->framebuffer_info[bottom_screen->index];
+
+    // TODO(Subv): Draw the HLE keyboard, for now just zero-fill the framebuffer
+    memset(Memory::GetPointer(info.address_left), 0, info.stride * 320);
+
+    GSP_GPU::SetBufferSwap(1, info);
+}
+
+void SoftwareKeyboard::Finalize() {
+    // Let the application know that we're closing
+    Service::APT::MessageParameter message;
+    message.buffer_size = sizeof(SoftwareKeyboardConfig);
+    message.data = reinterpret_cast<u8*>(&config);
+    message.signal = static_cast<u32>(Service::APT::SignalType::LibAppClosed);
+    message.destination_id = static_cast<u32>(Service::APT::AppletId::Application);
+    message.sender_id = static_cast<u32>(id);
+    Service::APT::SendParameter(message);
+
+    started = false;
+}
+
+}
+} // namespace
diff --git a/src/core/hle/applets/swkbd.h b/src/core/hle/applets/swkbd.h
new file mode 100644
index 00000000..cb95b8d9
--- /dev/null
+++ b/src/core/hle/applets/swkbd.h
@@ -0,0 +1,90 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "common/common_funcs.h"
+
+#include "core/hle/applets/applet.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/shared_memory.h"
+#include "core/hle/result.h"
+#include "core/hle/service/apt/apt.h"
+
+namespace HLE {
+namespace Applets {
+
+struct SoftwareKeyboardConfig {
+    INSERT_PADDING_WORDS(0x8);
+
+    u16 max_text_length; ///< Maximum length of the input text
+
+    INSERT_PADDING_BYTES(0x6E);
+
+    char16_t display_text[65]; ///< Text to display when asking the user for input
+
+    INSERT_PADDING_BYTES(0xE);
+
+    u32 default_text_offset; ///< Offset of the default text in the output SharedMemory
+
+    INSERT_PADDING_WORDS(0x3);
+
+    u32 shared_memory_size; ///< Size of the SharedMemory
+
+    INSERT_PADDING_WORDS(0x1);
+
+    u32 return_code; ///< Return code of the SoftwareKeyboard, usually 2, other values are unknown
+
+    INSERT_PADDING_WORDS(0x2);
+
+    u32 text_offset; ///< Offset in the SharedMemory where the output text starts
+    u16 text_length; ///< Length in characters of the output text
+
+    INSERT_PADDING_BYTES(0x2B6);
+};
+
+/**
+ * The size of this structure (0x400) has been verified via reverse engineering of multiple games
+ * that use the software keyboard.
+ */
+static_assert(sizeof(SoftwareKeyboardConfig) == 0x400, "Software Keyboard Config size is wrong");
+
+class SoftwareKeyboard final : public Applet {
+public:
+    SoftwareKeyboard(Service::APT::AppletId id);
+    ~SoftwareKeyboard() {}
+
+    ResultCode ReceiveParameter(const Service::APT::MessageParameter& parameter) override;
+    ResultCode StartImpl(const Service::APT::AppletStartupParameter& parameter) override;
+    void Update() override;
+    bool IsRunning() const override { return started; }
+
+    /**
+     * Draws a keyboard to the current bottom screen framebuffer.
+     */
+    void DrawScreenKeyboard();
+
+    /**
+     * Sends the LibAppletClosing signal to the application,
+     * along with the relevant data buffers.
+     */
+    void Finalize();
+
+    /// TODO(Subv): Find out what this is actually used for.
+    /// It is believed that the application stores the current screen image here.
+    Kernel::SharedPtr<Kernel::SharedMemory> framebuffer_memory;
+
+    /// SharedMemory where the output text will be stored
+    Kernel::SharedPtr<Kernel::SharedMemory> text_memory;
+
+    /// Configuration of this instance of the SoftwareKeyboard, as received from the application
+    SoftwareKeyboardConfig config;
+
+    /// Whether this applet is currently running instead of the host application or not.
+    bool started;
+};
+
+}
+} // namespace