Moved Native App from master repository

14 files changed, 2249 insertions, 0 deletions

diff --git a/NativeApp/src/Android/AndroidAppBase.cpp b/NativeApp/src/Android/AndroidAppBase.cpp
new file mode 100644
index 0000000..f3e341c
--- /dev/null
+++ b/NativeApp/src/Android/AndroidAppBase.cpp
@@ -0,0 +1,266 @@
+/*     Copyright 2015-2018 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include "AndroidAppBase.h"
+#include "Timer.h"
+
+#include <android/sensor.h>
+//#include <android/log.h>
+//#include <android_native_app_glue.h>
+#include <android/native_window_jni.h>
+//#include <cpu-features.h>
+
+namespace Diligent
+{
+
+int AndroidAppBase::InitDisplay()
+{
+    if( !initialized_resources_ )
+    {
+        Initialize();
+
+        LoadResources();
+        initialized_resources_ = true;
+    }
+    else
+    {
+        // initialize OpenGL ES and EGL
+        if( EGL_SUCCESS != Resume( app_->window ) )
+        {
+            UnloadResources();
+            LoadResources();
+        }
+    }
+
+    ShowUI();
+
+    //tap_camera_.SetFlip( 1.f, -1.f, -1.f );
+    //tap_camera_.SetPinchTransformFactor( 2.f, 2.f, 8.f );
+
+    return 0;    
+}
+
+void AndroidAppBase::InitSensors()
+{
+    sensor_manager_ = ASensorManager_getInstance();
+    accelerometer_sensor_ = ASensorManager_getDefaultSensor( sensor_manager_, ASENSOR_TYPE_ACCELEROMETER );
+    sensor_event_queue_ = ASensorManager_createEventQueue( sensor_manager_, app_->looper, LOOPER_ID_USER, NULL, NULL );
+}
+
+//
+// Just the current frame in the display.
+//
+void AndroidAppBase::DrawFrame()
+{
+    // APP_CMD_CONFIG_CHANGED event is generated seveal frames
+    // before the screen is actually resized. The only robust way
+    // to detect window resize is to check it very frame
+    if(CheckWindowSizeChanged())
+        WindowResize(0,0);
+
+    float fFPS;
+    if( monitor_.Update( fFPS ) )
+    {
+        UpdateFPS( fFPS );
+    }
+
+    static Diligent::Timer Timer;
+    static double PrevTime = Timer.GetElapsedTime();
+    auto CurrTime = Timer.GetElapsedTime();
+    auto ElapsedTime = CurrTime - PrevTime;
+    PrevTime = CurrTime;
+
+    Update(CurrTime, ElapsedTime);
+
+    Render();
+
+    Present();
+    //if( EGL_SUCCESS != pRenderDevice_->Present() )
+    //{
+    //    UnloadResources();
+    //    LoadResources();
+    //}
+}
+
+
+//
+// Process the next input event.
+//
+int32_t AndroidAppBase::HandleInput( android_app* app, AInputEvent* event )
+{
+    AndroidAppBase* eng = (AndroidAppBase*)app->userData;
+    return eng->HandleInput( event );
+}
+
+//
+// Process the next main command.
+//
+void AndroidAppBase::HandleCmd( struct android_app* app, int32_t cmd )
+{
+    AndroidAppBase* eng = (AndroidAppBase*)app->userData;
+    switch( cmd )
+    {
+    case APP_CMD_SAVE_STATE:
+        break;
+
+    case APP_CMD_INIT_WINDOW:
+        // The window is being shown, get it ready.
+        if( app->window != NULL )
+        {
+            eng->InitDisplay();
+            eng->DrawFrame();
+        }
+        break;
+
+    case APP_CMD_CONFIG_CHANGED:
+    case APP_CMD_WINDOW_RESIZED:
+        // This does not work as the screen resizes few frames
+        // after the event has been received
+        // eng->WindowResize(0,0);
+        break;
+
+    case APP_CMD_TERM_WINDOW:
+        // The window is being hidden or closed, clean it up.
+        eng->TermDisplay();
+        eng->has_focus_ = false;
+        break;
+
+    case APP_CMD_STOP:
+        break;
+
+    case APP_CMD_GAINED_FOCUS:
+        eng->ResumeSensors();
+        //Start animation
+        eng->has_focus_ = true;
+        break;
+
+    case APP_CMD_LOST_FOCUS:
+        eng->SuspendSensors();
+        // Also stop animating.
+        eng->has_focus_ = false;
+        eng->DrawFrame();
+        break;
+
+    case APP_CMD_LOW_MEMORY:
+        //Free up GL resources
+        eng->TrimMemory();
+        break;
+    }
+}
+
+//-------------------------------------------------------------------------
+//Sensor handlers
+//-------------------------------------------------------------------------
+void AndroidAppBase::ProcessSensors( int32_t id )
+{
+    // If a sensor has data, process it now.
+    if( id == LOOPER_ID_USER )
+    {
+        if( accelerometer_sensor_ != NULL )
+        {
+            ASensorEvent event;
+            while( ASensorEventQueue_getEvents( sensor_event_queue_, &event, 1 ) > 0 )
+            {
+            }
+        }
+    }
+}
+
+void AndroidAppBase::ResumeSensors()
+{
+    // When our app gains focus, we start monitoring the accelerometer.
+    if( accelerometer_sensor_ != NULL )
+    {
+        ASensorEventQueue_enableSensor( sensor_event_queue_, accelerometer_sensor_ );
+        // We'd like to get 60 events per second (in us).
+        ASensorEventQueue_setEventRate( sensor_event_queue_, accelerometer_sensor_,
+            (1000L / 60) * 1000 );
+    }
+}
+
+void AndroidAppBase::SuspendSensors()
+{
+    // When our app loses focus, we stop monitoring the accelerometer.
+    // This is to avoid consuming battery while not being used.
+    if( accelerometer_sensor_ != NULL )
+    {
+        ASensorEventQueue_disableSensor( sensor_event_queue_, accelerometer_sensor_ );
+    }
+}
+
+//-------------------------------------------------------------------------
+//Misc
+//-------------------------------------------------------------------------
+void AndroidAppBase::SetState( android_app* state, const char* native_activity_class_name )
+{
+    app_ = state;
+    native_activity_class_name_ = native_activity_class_name;
+    doubletap_detector_.SetConfiguration( app_->config );
+    drag_detector_.SetConfiguration( app_->config );
+    pinch_detector_.SetConfiguration( app_->config );
+}
+
+bool AndroidAppBase::IsReady()
+{
+    if( has_focus_ )
+        return true;
+
+    return false;
+}
+
+//void Engine::TransformPosition( ndk_helper::Vec2& vec )
+//{
+//    vec = ndk_helper::Vec2( 2.0f, 2.0f ) * vec
+//        / ndk_helper::Vec2( pDeviceContext_->GetMainBackBufferDesc().Width, pDeviceContext_->GetMainBackBufferDesc().Height )
+//        - ndk_helper::Vec2( 1.f, 1.f );
+//}
+
+void AndroidAppBase::ShowUI()
+{
+    JNIEnv *jni;
+    app_->activity->vm->AttachCurrentThread( &jni, NULL );
+
+    //Default class retrieval
+    jclass clazz = jni->GetObjectClass( app_->activity->clazz );
+    jmethodID methodID = jni->GetMethodID( clazz, "showUI", "()V" );
+    jni->CallVoidMethod( app_->activity->clazz, methodID );
+
+    app_->activity->vm->DetachCurrentThread();
+    return;
+}
+
+void AndroidAppBase::UpdateFPS( float fFPS )
+{
+    JNIEnv *jni;
+    app_->activity->vm->AttachCurrentThread( &jni, NULL );
+
+    //Default class retrieval
+    jclass clazz = jni->GetObjectClass( app_->activity->clazz );
+    jmethodID methodID = jni->GetMethodID( clazz, "updateFPS", "(F)V" );
+    jni->CallVoidMethod( app_->activity->clazz, methodID, fFPS );
+
+    app_->activity->vm->DetachCurrentThread();
+    return;
+}
+
+}
diff --git a/NativeApp/src/Android/AndroidMain.cpp b/NativeApp/src/Android/AndroidMain.cpp
new file mode 100644
index 0000000..6e65b8a
--- /dev/null
+++ b/NativeApp/src/Android/AndroidMain.cpp
@@ -0,0 +1,93 @@
+    /*     Copyright 2015-2018 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include <memory>
+#include <jni.h>
+#include <errno.h>
+
+#include "PlatformDefinitions.h"
+#include "NativeAppBase.h"
+
+
+#define HELPER_CLASS_NAME "com/android/helper/NDKHelper" //Class name of helper function
+#define NATIVEACTIVITY_CLASS_NAME "android/app/NativeActivity"
+
+using namespace Diligent;
+
+// This is the main entry point of a native application that is using
+// android_native_app_glue.  It runs in its own thread, with its own
+// event loop for receiving input events and doing other things.
+void android_main( android_app* state )
+{
+    std::unique_ptr<AndroidAppBase> theApp(CreateApplication());
+    theApp->SetState( state, NATIVEACTIVITY_CLASS_NAME );
+
+    //Init helper functions
+    ndk_helper::JNIHelper::Init( state->activity, HELPER_CLASS_NAME );
+
+    state->userData = theApp.get();
+    state->onAppCmd = AndroidAppBase::HandleCmd;
+    state->onInputEvent = AndroidAppBase::HandleInput;
+
+#ifdef USE_NDK_PROFILER
+    monstartup( "libEngineSandbox.so" );
+#endif
+
+    // Prepare to monitor accelerometer
+    theApp->InitSensors();
+
+    // loop waiting for stuff to do.
+    while( 1 )
+    {
+        // Read all pending events.
+        int id;
+        int events;
+        android_poll_source* source;
+
+        // If not animating, we will block forever waiting for events.
+        // If animating, we loop until all events are read, then continue
+        // to draw the next frame of animation.
+        while( (id = ALooper_pollAll( theApp->IsReady() ? 0 : -1, NULL, &events, (void**)&source )) >= 0 )
+        {
+            // Process this event.
+            if( source != NULL )
+                source->process( state, source );
+
+            theApp->ProcessSensors( id );
+
+            // Check if we are exiting.
+            if( state->destroyRequested != 0 )
+            {
+                theApp->TermDisplay();
+                return;
+            }
+        }
+
+        if( theApp->IsReady() )
+        {
+            // Drawing is throttled to the screen update rate, so there
+            // is no need to do timing here.
+            theApp->DrawFrame();
+        }
+    }
+}
diff --git a/NativeApp/src/IOS/IOSAppBase.cpp b/NativeApp/src/IOS/IOSAppBase.cpp
new file mode 100644
index 0000000..d4defb8
--- /dev/null
+++ b/NativeApp/src/IOS/IOSAppBase.cpp
@@ -0,0 +1,38 @@
+/*     Copyright 2015-2018 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include "IOSAppBase.h"
+
+namespace Diligent
+{
+
+void IOSAppBase::Update()
+{
+    // Render the scene
+    auto CurrTime = timer.GetElapsedTime();
+    auto ElapsedTime = CurrTime - PrevTime;
+    PrevTime = CurrTime;
+    Update(CurrTime, ElapsedTime);
+}
+
+}
diff --git a/NativeApp/src/Linux/LinuxMain.cpp b/NativeApp/src/Linux/LinuxMain.cpp
new file mode 100644
index 0000000..c8cf197
--- /dev/null
+++ b/NativeApp/src/Linux/LinuxMain.cpp
@@ -0,0 +1,526 @@
+/*     Copyright 2015-2018 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include <memory>
+#include <iomanip>
+
+#include "PlatformDefinitions.h"
+#include "NativeAppBase.h"
+#include "StringTools.h"
+#include "Timer.h"
+#include "Errors.h"
+
+
+#ifndef GLX_CONTEXT_MAJOR_VERSION_ARB
+#   define GLX_CONTEXT_MAJOR_VERSION_ARB       0x2091
+#endif
+
+#ifndef GLX_CONTEXT_MINOR_VERSION_ARB
+#   define GLX_CONTEXT_MINOR_VERSION_ARB       0x2092
+#endif
+
+#ifndef GLX_CONTEXT_FLAGS_ARB
+#   define GLX_CONTEXT_FLAGS_ARB               0x2094
+#endif
+
+#ifndef GLX_CONTEXT_DEBUG_BIT_ARB
+#   define GLX_CONTEXT_DEBUG_BIT_ARB           0x0001
+#endif
+
+typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, int, const int*);
+
+static constexpr uint16_t WindowWidth     = 1024;
+static constexpr uint16_t WindowHeight    = 768;
+static constexpr uint16_t MinWindowWidth  = 320;
+static constexpr uint16_t MinWindowHeight = 240;
+
+using namespace Diligent;
+
+namespace
+{
+    
+class WindowTitleHelper
+{
+public:
+    WindowTitleHelper(std::string _Title) : 
+        Title(std::move(_Title))
+    {}
+    
+    std::string GetTitleWithFPS(double ElapsedTime)
+    {
+        double filterScale = 0.2;
+        FilteredFrameTime = FilteredFrameTime * (1.0 - filterScale) + filterScale * ElapsedTime;
+        std::stringstream TitleWithFpsSS;
+        TitleWithFpsSS << Title;
+        TitleWithFpsSS << " - " << std::fixed << std::setprecision(1) << FilteredFrameTime * 1000;
+        TitleWithFpsSS << " ms (" << 1.0 / FilteredFrameTime << " fps)";
+        return TitleWithFpsSS.str();
+    }
+
+private:
+    const std::string Title;
+    double FilteredFrameTime = 0.0;
+};
+
+}
+
+#if VULKAN_SUPPORTED
+
+// https://code.woboq.org/qt5/include/xcb/xcb_icccm.h.html
+enum XCB_SIZE_HINT
+{
+    XCB_SIZE_HINT_US_POSITION     = 1 << 0,
+    XCB_SIZE_HINT_US_SIZE         = 1 << 1,
+    XCB_SIZE_HINT_P_POSITION      = 1 << 2,
+    XCB_SIZE_HINT_P_SIZE          = 1 << 3,
+    XCB_SIZE_HINT_P_MIN_SIZE      = 1 << 4,
+    XCB_SIZE_HINT_P_MAX_SIZE      = 1 << 5,
+    XCB_SIZE_HINT_P_RESIZE_INC    = 1 << 6,
+    XCB_SIZE_HINT_P_ASPECT        = 1 << 7,
+    XCB_SIZE_HINT_BASE_SIZE       = 1 << 8,
+    XCB_SIZE_HINT_P_WIN_GRAVITY   = 1 << 9
+};
+
+struct xcb_size_hints_t
+{
+    uint32_t flags;                         /** User specified flags */
+    int32_t x, y;                           /** User-specified position */
+    int32_t width, height;                  /** User-specified size */
+    int32_t min_width, min_height;          /** Program-specified minimum size */
+    int32_t max_width, max_height;          /** Program-specified maximum size */
+    int32_t width_inc, height_inc;          /** Program-specified resize increments */
+    int32_t min_aspect_num, min_aspect_den; /** Program-specified minimum aspect ratios */
+    int32_t max_aspect_num, max_aspect_den; /** Program-specified maximum aspect ratios */
+    int32_t base_width, base_height;        /** Program-specified base size */
+    uint32_t win_gravity;                   /** Program-specified window gravity */
+};
+
+struct XCBInfo
+{
+    xcb_connection_t* connection = nullptr;
+    uint32_t window = 0;
+    uint16_t width = 0;
+    uint16_t height = 0;
+    xcb_intern_atom_reply_t* atom_wm_delete_window = nullptr;
+};
+
+XCBInfo InitXCBConnectionAndWindow(const std::string& Title)
+{
+    XCBInfo info;
+
+    int scr = 0;
+    info.connection = xcb_connect(nullptr, &scr);
+    if (info.connection == nullptr || xcb_connection_has_error(info.connection))
+    {
+        std::cerr << "Unable to make an XCB connection\n";
+        exit(-1);
+    }
+
+    const xcb_setup_t* setup = xcb_get_setup(info.connection);
+    xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
+    while (scr-- > 0)
+        xcb_screen_next(&iter);
+
+    auto screen = iter.data;
+
+    info.width = WindowWidth;
+    info.height = WindowHeight;
+
+    uint32_t value_mask, value_list[32];
+
+    info.window = xcb_generate_id(info.connection);
+
+    value_mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
+    value_list[0] = screen->black_pixel;
+    value_list[1] =
+        XCB_EVENT_MASK_KEY_RELEASE |
+		XCB_EVENT_MASK_KEY_PRESS |
+		XCB_EVENT_MASK_EXPOSURE |
+		XCB_EVENT_MASK_STRUCTURE_NOTIFY |
+		XCB_EVENT_MASK_POINTER_MOTION |
+		XCB_EVENT_MASK_BUTTON_PRESS |
+		XCB_EVENT_MASK_BUTTON_RELEASE;
+
+    xcb_create_window(info.connection, XCB_COPY_FROM_PARENT, info.window, screen->root, 0, 0, info.width, info.height, 0,
+                        XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual, value_mask, value_list);
+
+    // Magic code that will send notification when window is destroyed
+    xcb_intern_atom_cookie_t cookie = xcb_intern_atom(info.connection, 1, 12, "WM_PROTOCOLS");
+    xcb_intern_atom_reply_t* reply = xcb_intern_atom_reply(info.connection, cookie, 0);
+
+    xcb_intern_atom_cookie_t cookie2 = xcb_intern_atom(info.connection, 0, 16, "WM_DELETE_WINDOW");
+    info.atom_wm_delete_window = xcb_intern_atom_reply(info.connection, cookie2, 0);
+
+    xcb_change_property(info.connection, XCB_PROP_MODE_REPLACE, info.window, (*reply).atom, 4, 32, 1,
+                        &(*info.atom_wm_delete_window).atom);
+    free(reply);
+
+    xcb_change_property(info.connection, XCB_PROP_MODE_REPLACE, info.window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING,
+                        8, Title.length(), Title.c_str() );
+
+    // https://stackoverflow.com/a/27771295
+    xcb_size_hints_t hints = {};
+    hints.flags = XCB_SIZE_HINT_P_MIN_SIZE;
+    hints.min_width = MinWindowWidth;
+    hints.min_height = MinWindowHeight;
+    xcb_change_property(info.connection, XCB_PROP_MODE_REPLACE, info.window, XCB_ATOM_WM_NORMAL_HINTS, XCB_ATOM_WM_SIZE_HINTS,
+                        32, sizeof(xcb_size_hints_t), &hints);
+
+    xcb_map_window(info.connection, info.window);
+
+    // Force the x/y coordinates to 100,100 results are identical in consecutive
+    // runs
+    const uint32_t coords[] = {100, 100};
+    xcb_configure_window(info.connection, info.window, XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, coords);
+    xcb_flush(info.connection);
+
+    xcb_generic_event_t *e;
+    while ((e = xcb_wait_for_event(info.connection)))
+    {
+        if ((e->response_type & ~0x80) == XCB_EXPOSE) break;
+    }
+    return info;
+}
+
+void DestroyXCBConnectionAndWindow(XCBInfo &info)
+{
+    xcb_destroy_window(info.connection, info.window);
+    xcb_disconnect(info.connection);
+}
+
+int xcb_main()
+{
+    std::unique_ptr<NativeAppBase> TheApp(CreateApplication());
+
+    std::string Title = TheApp->GetAppTitle();
+    auto xcbInfo = InitXCBConnectionAndWindow(Title);
+    if(!TheApp->InitVulkan(xcbInfo.connection, xcbInfo.window))
+        return -1;
+
+    xcb_flush(xcbInfo.connection);
+
+    Timer timer;
+    auto PrevTime = timer.GetElapsedTime();
+    Title = TheApp->GetAppTitle();
+    WindowTitleHelper TitleHelper(Title);
+
+    while (true)
+    {
+        xcb_generic_event_t* event = nullptr;
+        bool Quit = false;
+        while ((event = xcb_poll_for_event(xcbInfo.connection)) != nullptr)
+        {
+            TheApp->HandleXCBEvent(event);
+            switch (event->response_type & 0x7f)
+            {
+                case XCB_CLIENT_MESSAGE:
+                    if ((*(xcb_client_message_event_t*)event).data.data32[0] ==
+                        (*xcbInfo.atom_wm_delete_window).atom)
+                    {
+                        Quit = true;
+                    }
+                break;
+
+                case XCB_KEY_RELEASE:
+                {
+                    const auto* keyEvent = reinterpret_cast<const xcb_key_release_event_t*>(event);
+                    switch (keyEvent->detail)
+                    {
+                        #define KEY_ESCAPE 0x9
+                        case KEY_ESCAPE:
+                            Quit = true;
+                            break;
+                    }
+                }
+                break;
+
+                case XCB_DESTROY_NOTIFY:
+                    Quit = true;
+                break;
+
+                case XCB_CONFIGURE_NOTIFY:
+                {
+                    const auto* cfgEvent = reinterpret_cast<const xcb_configure_notify_event_t*>(event);
+                    if ((cfgEvent->width != xcbInfo.width) || (cfgEvent->height != xcbInfo.height))
+                    {
+                        xcbInfo.width  = cfgEvent->width;
+                        xcbInfo.height = cfgEvent->height;
+                        if ((xcbInfo.width > 0) && (xcbInfo.height > 0))
+                        {
+                            TheApp->WindowResize(xcbInfo.width, xcbInfo.height);
+                        }
+                    }
+                }
+                break;
+                                    
+                default:
+                    break;
+            }
+            free(event);
+        }
+
+        if (Quit)
+            break;
+
+        // Render the scene
+        auto CurrTime = timer.GetElapsedTime();
+        auto ElapsedTime = CurrTime - PrevTime;
+        PrevTime = CurrTime;
+
+        TheApp->Update(CurrTime, ElapsedTime);
+
+        TheApp->Render();
+        
+        TheApp->Present();
+
+        auto TitleWithFPS = TitleHelper.GetTitleWithFPS(ElapsedTime);
+        xcb_change_property(xcbInfo.connection, XCB_PROP_MODE_REPLACE, xcbInfo.window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING,
+                            8, TitleWithFPS.length(), TitleWithFPS.c_str() );
+        xcb_flush(xcbInfo.connection);
+    }
+
+    TheApp.reset();
+    DestroyXCBConnectionAndWindow(xcbInfo);
+
+    return 0;
+}
+
+#endif
+
+
+int x_main()
+{
+    std::unique_ptr<NativeAppBase> TheApp(CreateApplication());
+    Display *display = XOpenDisplay(0);
+
+    static int visual_attribs[] =
+    {
+        GLX_RENDER_TYPE,    GLX_RGBA_BIT,
+        GLX_DRAWABLE_TYPE,  GLX_WINDOW_BIT,
+        GLX_DOUBLEBUFFER,   true,
+
+        // The largest available total RGBA color buffer size (sum of GLX_RED_SIZE, 
+        // GLX_GREEN_SIZE, GLX_BLUE_SIZE, and GLX_ALPHA_SIZE) of at least the minimum
+        // size specified for each color component is preferred.
+        GLX_RED_SIZE,       8,
+        GLX_GREEN_SIZE,     8,
+        GLX_BLUE_SIZE,      8,
+        GLX_ALPHA_SIZE,     8,
+
+        // The largest available depth buffer of at least GLX_DEPTH_SIZE size is preferred
+        GLX_DEPTH_SIZE,     24,
+
+        //GLX_SAMPLE_BUFFERS, 1,
+        GLX_SAMPLES, 1,
+        None
+     };
+ 
+    int fbcount = 0;
+    GLXFBConfig *fbc = glXChooseFBConfig(display, DefaultScreen(display), visual_attribs, &fbcount);
+    if (!fbc)
+    {
+        LOG_ERROR_MESSAGE("Failed to retrieve a framebuffer config");
+        return -1;
+    }
+ 
+    XVisualInfo *vi = glXGetVisualFromFBConfig(display, fbc[0]);
+ 
+    XSetWindowAttributes swa;
+    swa.colormap = XCreateColormap(display, RootWindow(display, vi->screen), vi->visual, AllocNone);
+    swa.border_pixel = 0;
+    swa.event_mask = 
+        StructureNotifyMask |  
+        ExposureMask |  
+        KeyPressMask | 
+        KeyReleaseMask |
+        ButtonPressMask | 
+        ButtonReleaseMask | 
+        PointerMotionMask;
+ 
+    Window win = XCreateWindow(display, RootWindow(display, vi->screen), 0, 0, WindowWidth, WindowHeight, 0, vi->depth, InputOutput, vi->visual, CWBorderPixel|CWColormap|CWEventMask, &swa);
+    if (!win)
+    {
+        LOG_ERROR_MESSAGE("Failed to create window.");
+        return -1;
+    }
+ 
+    {
+        auto SizeHints = XAllocSizeHints();
+        SizeHints->flags = PMinSize;
+        SizeHints->min_width = MinWindowWidth;
+        SizeHints->min_height = MinWindowHeight;
+        XSetWMNormalHints(display, win, SizeHints);
+        XFree(SizeHints);
+    }
+
+    XMapWindow(display, win);
+ 
+    glXCreateContextAttribsARBProc glXCreateContextAttribsARB = nullptr;
+    {
+        // Create an oldstyle context first, to get the correct function pointer for glXCreateContextAttribsARB
+        GLXContext ctx_old = glXCreateContext(display, vi, 0, GL_TRUE);
+        glXCreateContextAttribsARB =  (glXCreateContextAttribsARBProc)glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
+        glXMakeCurrent(display, None, NULL);
+        glXDestroyContext(display, ctx_old);
+    }
+ 
+    if (glXCreateContextAttribsARB == nullptr)
+    {
+        LOG_ERROR("glXCreateContextAttribsARB entry point not found. Aborting.");
+        return -1;
+    }
+ 
+    int Flags = GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+#ifdef _DEBUG
+     Flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
+#endif 
+    
+    int major_version = 4;
+    int minor_version = 3;
+    static int context_attribs[] =
+    {
+        GLX_CONTEXT_MAJOR_VERSION_ARB, major_version,
+        GLX_CONTEXT_MINOR_VERSION_ARB, minor_version,
+        GLX_CONTEXT_FLAGS_ARB, Flags,
+        None
+    };
+  
+    constexpr int True = 1;
+    GLXContext ctx = glXCreateContextAttribsARB(display, fbc[0], NULL, True, context_attribs);
+    if (!ctx)
+    {
+        LOG_ERROR("Failed to create GL context.");
+        return -1;
+    }
+    XFree(fbc);
+    
+
+    glXMakeCurrent(display, win, ctx);
+    TheApp->OnGLContextCreated(display, win);
+    std::string Title = TheApp->GetAppTitle();
+ 
+    Timer timer;
+    auto PrevTime = timer.GetElapsedTime();
+    WindowTitleHelper TitleHelper(Title);
+ 
+    while (true) 
+    {
+        bool EscPressed = false;
+        XEvent xev;
+        // Handle all events in the queue
+        while(XCheckMaskEvent(display, 0xFFFFFFFF, &xev))
+        {
+            TheApp->HandleXEvent(&xev);
+            switch(xev.type)
+            {
+                case KeyPress:
+                {
+                    KeySym keysym;
+                    char buffer[80];
+                    int num_char = XLookupString((XKeyEvent *)&xev, buffer, _countof(buffer), &keysym, 0);
+                    EscPressed = (keysym==XK_Escape);
+                }
+                
+                case ConfigureNotify:
+                {
+                    XConfigureEvent &xce = reinterpret_cast<XConfigureEvent &>(xev);
+                    if(xce.width != 0 && xce.height != 0)
+                        TheApp->WindowResize(xce.width, xce.height);
+                    break;
+                }
+            }
+        }
+
+        if(EscPressed)
+            break;
+
+        // Render the scene
+        auto CurrTime = timer.GetElapsedTime();
+        auto ElapsedTime = CurrTime - PrevTime;
+        PrevTime = CurrTime;
+
+        TheApp->Update(CurrTime, ElapsedTime);
+
+        TheApp->Render();
+        
+        TheApp->Present();
+
+        auto TitleWithFPS = TitleHelper.GetTitleWithFPS(ElapsedTime);
+        XStoreName(display, win, TitleWithFPS.c_str());
+    }
+
+    TheApp.reset();
+ 
+    ctx = glXGetCurrentContext();
+    glXMakeCurrent(display, None, NULL);
+    glXDestroyContext(display, ctx);
+    XDestroyWindow(display, win);
+    XCloseDisplay(display);
+}
+
+int main (int argc, char ** argv)
+{
+    bool UseVulkan = false;
+
+#if VULKAN_SUPPORTED
+    UseVulkan = true;
+    if (argc > 1)
+    {
+        const auto* Key = "-mode ";
+        const auto* pos = strstr(argv[1], Key);
+        if (pos != nullptr)
+        {
+            pos += strlen(Key);
+            while(*pos != 0 && *pos == ' ')++pos;
+            if (strcasecmp(pos, "GL") == 0)
+            {
+                UseVulkan = false;
+            }
+            else if (strcasecmp(pos, "VK") == 0)
+            {
+                UseVulkan = true;
+            }
+            else
+            {
+                std::cerr << "Unknown device type. Only the following types are supported: GL, VK";
+                return -1;
+            }
+        }
+    }
+
+    if (UseVulkan)
+    {
+        auto ret = xcb_main();
+        if (ret >= 0)
+        {
+            return ret;
+        }
+        else
+        {
+            LOG_ERROR_MESSAGE("Failed to initialize the engine in Vulkan mode. Attempting to use OpenGL");
+        }
+    }
+#endif
+
+    return x_main();
+}
diff --git a/NativeApp/src/MacOS/MacOSAppBase.cpp b/NativeApp/src/MacOS/MacOSAppBase.cpp
new file mode 100644
index 0000000..f3d0313
--- /dev/null
+++ b/NativeApp/src/MacOS/MacOSAppBase.cpp
@@ -0,0 +1,38 @@
+/*     Copyright 2015-2019 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include "MacOSAppBase.h"
+
+namespace Diligent
+{
+
+void MacOSAppBase::Update()
+{
+    // Render the scene
+    auto CurrTime = timer.GetElapsedTime();
+    auto ElapsedTime = CurrTime - PrevTime;
+    PrevTime = CurrTime;
+    Update(CurrTime, ElapsedTime);
+}
+
+}
diff --git a/NativeApp/src/UWP/App.cpp b/NativeApp/src/UWP/App.cpp
new file mode 100644
index 0000000..0c928eb
--- /dev/null
+++ b/NativeApp/src/UWP/App.cpp
@@ -0,0 +1,351 @@
+/*     Copyright 2015-2016 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#define NOMINIMAX
+#include <wrl.h>
+#include <wrl/client.h>
+#include <DirectXMath.h>
+#include <agile.h>
+
+#if defined(_DEBUG)
+#   include <dxgidebug.h>
+#endif
+
+#include "App.h"
+#include "StringTools.h"
+
+#include <ppltasks.h>
+
+using namespace SampleApp;
+using namespace Diligent;
+
+using namespace concurrency;
+using namespace Windows::ApplicationModel;
+using namespace Windows::ApplicationModel::Core;
+using namespace Windows::ApplicationModel::Activation;
+using namespace Windows::UI::Core;
+using namespace Windows::UI::Input;
+using namespace Windows::System;
+using namespace Windows::Foundation;
+using namespace Windows::Graphics::Display;
+
+using Microsoft::WRL::ComPtr;
+
+
+ref class ApplicationSource sealed : IFrameworkViewSource
+{
+public:
+    virtual IFrameworkView^ CreateView()
+    {
+        return ref new App();
+    }
+};
+
+
+// The main function is only used to initialize our IFrameworkView class.
+[Platform::MTAThread]
+int main(Platform::Array<Platform::String^>^)
+{
+    auto direct3DApplicationSource = ref new ApplicationSource();
+    CoreApplication::Run(direct3DApplicationSource);
+    return 0;
+}
+
+App::App() :
+    m_windowClosed(false),
+    m_windowVisible(true)
+{
+}
+
+
+// The first method called when the IFrameworkView is being created.
+void App::Initialize(CoreApplicationView^ applicationView)
+{
+    // Register event handlers for app lifecycle. This example includes Activated, so that we
+    // can make the CoreWindow active and start rendering on the window.
+    applicationView->Activated +=
+        ref new TypedEventHandler<CoreApplicationView^, IActivatedEventArgs^>(this, &App::OnActivated);
+    
+    CoreApplication::Suspending +=
+        ref new EventHandler<SuspendingEventArgs^>(this, &App::OnSuspending);
+
+    CoreApplication::Resuming +=
+        ref new EventHandler<Platform::Object^>(this, &App::OnResuming);
+}
+
+// Called when the CoreWindow object is created (or re-created).
+void App::SetWindow(CoreWindow^ window)
+{
+    window->SizeChanged += 
+        ref new TypedEventHandler<CoreWindow^, WindowSizeChangedEventArgs^>(this, &App::OnWindowSizeChanged);
+
+    window->VisibilityChanged +=
+        ref new TypedEventHandler<CoreWindow^, VisibilityChangedEventArgs^>(this, &App::OnVisibilityChanged);
+
+    window->Closed += 
+        ref new TypedEventHandler<CoreWindow^, CoreWindowEventArgs^>(this, &App::OnWindowClosed);
+
+    window->KeyDown += 
+        ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &App::OnKeyDown);
+
+    window->KeyUp +=
+        ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &App::OnKeyUp);
+
+    DisplayInformation^ currentDisplayInformation = DisplayInformation::GetForCurrentView();
+
+    currentDisplayInformation->DpiChanged +=
+        ref new TypedEventHandler<DisplayInformation^, Object^>(this, &App::OnDpiChanged);
+
+    currentDisplayInformation->OrientationChanged +=
+        ref new TypedEventHandler<DisplayInformation^, Object^>(this, &App::OnOrientationChanged);
+
+    DisplayInformation::DisplayContentsInvalidated +=
+        ref new TypedEventHandler<DisplayInformation^, Object^>(this, &App::OnDisplayContentsInvalidated);
+
+    if (m_Main)
+    {
+        m_Main->OnSetWindow(window);
+    }
+}
+
+// Initializes scene resources, or loads a previously saved app state.
+void App::Load(Platform::String^ entryPoint)
+{
+    if (m_Main == nullptr)
+    {
+        m_Main.reset(CreateApplication());
+        m_Main->OnSetWindow(CoreWindow::GetForCurrentThread());
+    }
+}
+
+// This method is called after the window becomes active.
+void App::Run()
+{
+    while (!m_windowClosed)
+    {
+        if (m_windowVisible)
+        {
+            CoreWindow::GetForCurrentThread()->Dispatcher->ProcessEvents(CoreProcessEventsOption::ProcessAllIfPresent);
+
+            // Initialize device resources
+            GetDeviceResources();
+
+            //PIXBeginEvent(commandQueue, 0, L"Update");
+            {
+                m_Main->Update();
+            }
+            //PIXEndEvent(commandQueue);
+
+            //PIXBeginEvent(commandQueue, 0, L"Render");
+            {
+                m_Main->Render();
+                if (m_Main->IsFrameReady())
+                {
+                    m_Main->Present();
+                }
+            }
+            //PIXEndEvent(commandQueue);
+        }
+        else
+        {
+            CoreWindow::GetForCurrentThread()->Dispatcher->ProcessEvents(CoreProcessEventsOption::ProcessOneAndAllPending);
+        }
+    }
+}
+
+// Required for IFrameworkView.
+// Terminate events do not cause Uninitialize to be called. It will be called if your IFrameworkView
+// class is torn down while the app is in the foreground.
+void App::Uninitialize()
+{
+}
+
+// Application lifecycle event handlers.
+
+void App::OnActivated(CoreApplicationView^ applicationView, IActivatedEventArgs^ args)
+{
+    if (args->Kind == ActivationKind::Launch)
+    {
+        LaunchActivatedEventArgs^ launchArgs = (LaunchActivatedEventArgs^)args;
+        auto CmdLine = Diligent::NarrowString(launchArgs->Arguments->Data());
+        m_Main->ProcessCommandLine(CmdLine.c_str());
+    }
+
+    auto Title = Diligent::WidenString(m_Main->GetAppTitle());
+    Windows::UI::ViewManagement::ApplicationView::GetForCurrentView()->Title = ref new Platform::String(Title.c_str());
+
+    // Run() won't start until the CoreWindow is activated.
+    CoreWindow::GetForCurrentThread()->Activate();
+}
+
+void App::OnSuspending(Platform::Object^ sender, SuspendingEventArgs^ args)
+{
+    // Save app state asynchronously after requesting a deferral. Holding a deferral
+    // indicates that the application is busy performing suspending operations. Be
+    // aware that a deferral may not be held indefinitely. After about five seconds,
+    // the app will be forced to exit.
+    SuspendingDeferral^ deferral = args->SuspendingOperation->GetDeferral();
+
+    create_task([this, deferral]()
+    {
+        m_Main->OnSuspending();
+        deferral->Complete();
+    });
+}
+
+void App::OnResuming(Platform::Object^ sender, Platform::Object^ args)
+{
+    // Restore any data or state that was unloaded on suspend. By default, data
+    // and state are persisted when resuming from suspend. Note that this event
+    // does not occur if the app was previously terminated.
+
+    m_Main->OnResuming();
+}
+
+// Window event handlers.
+
+void App::OnWindowSizeChanged(CoreWindow^ sender, WindowSizeChangedEventArgs^ args)
+{
+    if (auto DeviceResources = GetDeviceResources())
+    {
+        DeviceResources->SetLogicalSize(Size(sender->Bounds.Width, sender->Bounds.Height));
+        m_Main->OnWindowSizeChanged();
+    }
+}
+
+void App::OnVisibilityChanged(CoreWindow^ sender, VisibilityChangedEventArgs^ args)
+{
+    m_windowVisible = args->Visible;
+}
+
+void App::OnWindowClosed(CoreWindow^ sender, CoreWindowEventArgs^ args)
+{
+    m_windowClosed = true;
+}
+
+// DisplayInformation event handlers.
+
+void App::OnDpiChanged(DisplayInformation^ sender, Object^ args)
+{
+    // Note: The value for LogicalDpi retrieved here may not match the effective DPI of the app
+    // if it is being scaled for high resolution devices. Once the DPI is set on DeviceResources,
+    // you should always retrieve it using the GetDpi method.
+    // See DeviceResources.cpp for more details.
+    if (auto DeviceResources = GetDeviceResources())
+    {
+        DeviceResources->SetDpi(sender->LogicalDpi);
+        m_Main->OnWindowSizeChanged();
+    }
+}
+
+void App::OnOrientationChanged(DisplayInformation^ sender, Object^ args)
+{
+    if (auto DeviceResources = GetDeviceResources())
+    {
+        DeviceResources->SetCurrentOrientation(sender->CurrentOrientation);
+        m_Main->OnWindowSizeChanged();
+    }
+}
+
+void App::OnDisplayContentsInvalidated(DisplayInformation^ sender, Object^ args)
+{
+    if (auto DeviceResources = GetDeviceResources())
+    {
+        DeviceResources->ValidateDevice();
+    }
+}
+
+void App::OnKeyDown(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args)
+{
+    auto Key = args->VirtualKey;
+    switch(Key)
+    {
+        case VirtualKey::Escape:
+            CoreApplication::Exit();
+        break;
+
+        case VirtualKey::Enter:
+            if(m_bShiftPressed)
+            {
+                auto applicationView = Windows::UI::ViewManagement::ApplicationView::GetForCurrentView();
+                if (applicationView->IsFullScreenMode)
+                {
+                    applicationView->ExitFullScreenMode();
+                }
+                else
+                {
+                    applicationView->TryEnterFullScreenMode();
+                }
+            }
+        break;
+
+        case VirtualKey::Shift:
+            m_bShiftPressed = true;
+            break;
+    }
+}
+
+void App::OnKeyUp(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args)
+{
+    auto Key = args->VirtualKey;
+    switch (Key)
+    {
+        case VirtualKey::Shift:
+            m_bShiftPressed = false;
+            break;
+    }
+}
+
+std::shared_ptr<DX::DeviceResources> App::GetDeviceResources()
+{
+    if (m_deviceResources != nullptr && m_deviceResources->IsDeviceRemoved())
+    {
+        // All references to the existing D3D device must be released before a new device
+        // can be created.
+
+        m_deviceResources = nullptr;
+        m_Main->OnDeviceRemoved();
+
+#if defined(_DEBUG)
+        ComPtr<IDXGIDebug1> dxgiDebug;
+        if (SUCCEEDED(DXGIGetDebugInterface1(0, IID_PPV_ARGS(&dxgiDebug))))
+        {
+            dxgiDebug->ReportLiveObjects(DXGI_DEBUG_ALL, DXGI_DEBUG_RLO_FLAGS(DXGI_DEBUG_RLO_SUMMARY | DXGI_DEBUG_RLO_IGNORE_INTERNAL));
+        }
+#endif
+    }
+
+    if (m_deviceResources == nullptr)
+    {
+        m_deviceResources = m_Main->InitDeviceResources();
+        if (m_deviceResources)
+        {
+            m_deviceResources->SetWindow(CoreWindow::GetForCurrentThread());
+            auto Title = Diligent::WidenString(m_Main->GetAppTitle());
+            Windows::UI::ViewManagement::ApplicationView::GetForCurrentView()->Title = ref new Platform::String(Title.c_str());
+            m_Main->OnWindowSizeChanged();
+            m_Main->CreateRenderers();
+        }
+    }
+    return m_deviceResources;
+}
diff --git a/NativeApp/src/UWP/App.h b/NativeApp/src/UWP/App.h
new file mode 100644
index 0000000..4f31f07
--- /dev/null
+++ b/NativeApp/src/UWP/App.h
@@ -0,0 +1,71 @@
+/*     Copyright 2015-2016 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#pragma once
+
+#include "Common\DeviceResources.h"
+#include "NativeAppBase.h"
+
+namespace SampleApp
+{
+    // Main entry point for our app. Connects the app with the Windows shell and handles application lifecycle events.
+    ref class App sealed : public Windows::ApplicationModel::Core::IFrameworkView
+    {
+    public:
+        App();
+
+        // IFrameworkView methods.
+        virtual void Initialize(Windows::ApplicationModel::Core::CoreApplicationView^ applicationView);
+        virtual void SetWindow(Windows::UI::Core::CoreWindow^ window);
+        virtual void Load(Platform::String^ entryPoint);
+        virtual void Run();
+        virtual void Uninitialize();
+
+    protected:
+        // Application lifecycle event handlers.
+        void OnActivated(Windows::ApplicationModel::Core::CoreApplicationView^ applicationView, Windows::ApplicationModel::Activation::IActivatedEventArgs^ args);
+        void OnSuspending(Platform::Object^ sender, Windows::ApplicationModel::SuspendingEventArgs^ args);
+        void OnResuming(Platform::Object^ sender, Platform::Object^ args);
+
+        // Window event handlers.
+        void OnWindowSizeChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::WindowSizeChangedEventArgs^ args);
+        void OnVisibilityChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::VisibilityChangedEventArgs^ args);
+        void OnWindowClosed(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::CoreWindowEventArgs^ args);
+
+        // DisplayInformation event handlers.
+        void OnDpiChanged(Windows::Graphics::Display::DisplayInformation^ sender, Platform::Object^ args);
+        void OnOrientationChanged(Windows::Graphics::Display::DisplayInformation^ sender, Platform::Object^ args);
+        void OnDisplayContentsInvalidated(Windows::Graphics::Display::DisplayInformation^ sender, Platform::Object^ args);
+
+        void OnKeyDown(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);
+        void OnKeyUp(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);
+
+    private:
+        std::shared_ptr<DX::DeviceResources> GetDeviceResources();
+        std::unique_ptr<Diligent::NativeAppBase> m_Main;
+        std::shared_ptr<DX::DeviceResources> m_deviceResources;
+        bool m_windowClosed = false;
+        bool m_windowVisible = false;
+        bool m_bShiftPressed = false;
+    };
+}
diff --git a/NativeApp/src/UWP/Common/DeviceResources.cpp b/NativeApp/src/UWP/Common/DeviceResources.cpp
new file mode 100644
index 0000000..c111a54
--- /dev/null
+++ b/NativeApp/src/UWP/Common/DeviceResources.cpp
@@ -0,0 +1,328 @@
+
+#define NOMINIMAX
+#include <wrl.h>
+#include <wrl/client.h>
+#include <DirectXMath.h>
+#include <agile.h>
+
+#include <dxgi1_4.h>
+#include <d3d12.h>
+#include <d3d11.h>
+#include <pix.h>
+
+#if defined(_DEBUG)
+#   include <dxgidebug.h>
+#endif
+
+#include "DeviceResources.h"
+#include "DirectXHelper.h"
+
+
+using namespace DirectX;
+using namespace Microsoft::WRL;
+using namespace Windows::Foundation;
+using namespace Windows::Graphics::Display;
+using namespace Windows::UI::Core;
+using namespace Windows::UI::Xaml::Controls;
+using namespace Platform;
+
+namespace DisplayMetrics
+{
+    // High resolution displays can require a lot of GPU and battery power to render.
+    // High resolution phones, for example, may suffer from poor battery life if
+    // games attempt to render at 60 frames per second at full fidelity.
+    // The decision to render at full fidelity across all platforms and form factors
+    // should be deliberate.
+    static const bool SupportHighResolutions = false;
+
+    // The default thresholds that define a "high resolution" display. If the thresholds
+    // are exceeded and SupportHighResolutions is false, the dimensions will be scaled
+    // by 50%.
+    static const float DpiThreshold = 192.0f;		// 200% of standard desktop display.
+    static const float WidthThreshold = 1920.0f;	// 1080p width.
+    static const float HeightThreshold = 1080.0f;	// 1080p height.
+};
+
+// Constants used to calculate screen rotations.
+namespace ScreenRotation
+{
+    // 0-degree Z-rotation
+    static const XMFLOAT4X4 Rotation0(
+        1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, 1.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+        );
+
+    // 90-degree Z-rotation
+    static const XMFLOAT4X4 Rotation90(
+        0.0f, 1.0f, 0.0f, 0.0f,
+        -1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+        );
+
+    // 180-degree Z-rotation
+    static const XMFLOAT4X4 Rotation180(
+        -1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, -1.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+        );
+
+    // 270-degree Z-rotation
+    static const XMFLOAT4X4 Rotation270(
+        0.0f, -1.0f, 0.0f, 0.0f,
+        1.0f, 0.0f, 0.0f, 0.0f,
+        0.0f, 0.0f, 1.0f, 0.0f,
+        0.0f, 0.0f, 0.0f, 1.0f
+        );
+};
+
+// Constructor for DeviceResources.
+DX::DeviceResources::DeviceResources(ID3D11Device *d3d11Device, ID3D12Device *d3d12Device) :
+    m_d3dRenderTargetSize(),
+    m_outputSize(),
+    m_logicalSize(),
+    m_nativeOrientation(DisplayOrientations::None),
+    m_currentOrientation(DisplayOrientations::None),
+    m_dpi(-1.0f),
+    m_deviceRemoved(false),
+    m_d3d11Device(d3d11Device),
+    m_d3d12Device(d3d12Device)
+{
+}
+
+
+void DX::DeviceResources::SetSwapChainRotation(IDXGISwapChain3 *swapChain)
+{
+    // Set the proper orientation for the swap chain, and generate
+    // 3D matrix transformations for rendering to the rotated swap chain.
+    // The 3D matrix is specified explicitly to avoid rounding errors.
+    DXGI_MODE_ROTATION displayRotation = ComputeDisplayRotation();
+    switch (displayRotation)
+    {
+    case DXGI_MODE_ROTATION_IDENTITY:
+        m_orientationTransform3D = ScreenRotation::Rotation0;
+        break;
+
+    case DXGI_MODE_ROTATION_ROTATE90:
+        m_orientationTransform3D = ScreenRotation::Rotation270;
+        break;
+
+    case DXGI_MODE_ROTATION_ROTATE180:
+        m_orientationTransform3D = ScreenRotation::Rotation180;
+        break;
+
+    case DXGI_MODE_ROTATION_ROTATE270:
+        m_orientationTransform3D = ScreenRotation::Rotation90;
+        break;
+
+    default:
+        throw ref new FailureException();
+    }
+
+    DX::ThrowIfFailed(
+        swapChain->SetRotation(displayRotation)
+    );
+}
+
+// Determine the dimensions of the render target and whether it will be scaled down.
+void DX::DeviceResources::UpdateRenderTargetSize()
+{
+    m_effectiveDpi = m_dpi;
+
+    // To improve battery life on high resolution devices, render to a smaller render target
+    // and allow the GPU to scale the output when it is presented.
+    if (!DisplayMetrics::SupportHighResolutions && m_dpi > DisplayMetrics::DpiThreshold)
+    {
+        float width = DX::ConvertDipsToPixels(m_logicalSize.Width, m_dpi);
+        float height = DX::ConvertDipsToPixels(m_logicalSize.Height, m_dpi);
+
+        // When the device is in portrait orientation, height > width. Compare the
+        // larger dimension against the width threshold and the smaller dimension
+        // against the height threshold.
+        if (max(width, height) > DisplayMetrics::WidthThreshold && min(width, height) > DisplayMetrics::HeightThreshold)
+        {
+            // To scale the app we change the effective DPI. Logical size does not change.
+            m_effectiveDpi /= 2.0f;
+        }
+    }
+
+    // Calculate the necessary render target size in pixels.
+    m_outputSize.Width = DX::ConvertDipsToPixels(m_logicalSize.Width, m_effectiveDpi);
+    m_outputSize.Height = DX::ConvertDipsToPixels(m_logicalSize.Height, m_effectiveDpi);
+
+    // Prevent zero size DirectX content from being created.
+    m_outputSize.Width = max(m_outputSize.Width, 1);
+    m_outputSize.Height = max(m_outputSize.Height, 1);
+
+
+    // The width and height of the swap chain must be based on the window's
+    // natively-oriented width and height. If the window is not in the native
+    // orientation, the dimensions must be reversed.
+    DXGI_MODE_ROTATION displayRotation = ComputeDisplayRotation();
+
+    bool swapDimensions = displayRotation == DXGI_MODE_ROTATION_ROTATE90 || displayRotation == DXGI_MODE_ROTATION_ROTATE270;
+    auto fWidth = swapDimensions ? m_outputSize.Height : m_outputSize.Width;
+    auto fHeight = swapDimensions ? m_outputSize.Width : m_outputSize.Height;
+
+    m_backBufferWidth = lround(fWidth);
+    m_backBufferHeight = lround(fHeight);
+}
+
+// This method is called when the CoreWindow is created (or re-created).
+void DX::DeviceResources::SetWindow(CoreWindow^ window)
+{
+    DisplayInformation^ currentDisplayInformation = DisplayInformation::GetForCurrentView();
+
+    m_window = window;
+    m_logicalSize = Windows::Foundation::Size(window->Bounds.Width, window->Bounds.Height);
+    m_nativeOrientation = currentDisplayInformation->NativeOrientation;
+    m_currentOrientation = currentDisplayInformation->CurrentOrientation;
+    m_dpi = currentDisplayInformation->LogicalDpi;
+
+    //CreateWindowSizeDependentResources();
+}
+
+// This method is called in the event handler for the SizeChanged event.
+void DX::DeviceResources::SetLogicalSize(Windows::Foundation::Size logicalSize)
+{
+    if (m_logicalSize != logicalSize)
+    {
+        m_logicalSize = logicalSize;
+        //CreateWindowSizeDependentResources();
+    }
+}
+
+// This method is called in the event handler for the DpiChanged event.
+void DX::DeviceResources::SetDpi(float dpi)
+{
+    if (dpi != m_dpi)
+    {
+        m_dpi = dpi;
+
+        // When the display DPI changes, the logical size of the window (measured in Dips) also changes and needs to be updated.
+        m_logicalSize = Windows::Foundation::Size(m_window->Bounds.Width, m_window->Bounds.Height);
+
+        //CreateWindowSizeDependentResources();
+    }
+}
+
+// This method is called in the event handler for the OrientationChanged event.
+void DX::DeviceResources::SetCurrentOrientation(DisplayOrientations currentOrientation)
+{
+    if (m_currentOrientation != currentOrientation)
+    {
+        m_currentOrientation = currentOrientation;
+        //CreateWindowSizeDependentResources();
+    }
+}
+
+// This method is called in the event handler for the DisplayContentsInvalidated event.
+void DX::DeviceResources::ValidateDevice()
+{
+    // The D3D Device is no longer valid if the default adapter changed since the device
+    // was created or if the device has been removed.
+
+    ComPtr<IDXGIDevice3> dxgiDevice;
+    if(m_d3d11Device)
+        DX::ThrowIfFailed(m_d3d11Device.As(&dxgiDevice));
+    else if(m_d3d12Device)
+        DX::ThrowIfFailed(m_d3d12Device.As(&dxgiDevice));
+
+    ComPtr<IDXGIAdapter> deviceAdapter;
+    DX::ThrowIfFailed(dxgiDevice->GetAdapter(&deviceAdapter));
+
+    ComPtr<IDXGIFactory2> deviceFactory;
+    DX::ThrowIfFailed(deviceAdapter->GetParent(IID_PPV_ARGS(&deviceFactory)));
+
+    // First, get the LUID for the default adapter from when the device was created.
+
+    DXGI_ADAPTER_DESC previousDesc;
+    {
+        ComPtr<IDXGIAdapter1> previousDefaultAdapter;
+        DX::ThrowIfFailed(deviceFactory->EnumAdapters1(0, &previousDefaultAdapter));
+
+        DX::ThrowIfFailed(previousDefaultAdapter->GetDesc(&previousDesc));
+    }
+
+    // Next, get the information for the current default adapter.
+
+    DXGI_ADAPTER_DESC currentDesc;
+    {
+        ComPtr<IDXGIFactory4> currentDxgiFactory;
+        DX::ThrowIfFailed(CreateDXGIFactory1(IID_PPV_ARGS(&currentDxgiFactory)));
+
+        ComPtr<IDXGIAdapter1> currentDefaultAdapter;
+        DX::ThrowIfFailed(currentDxgiFactory->EnumAdapters1(0, &currentDefaultAdapter));
+
+        DX::ThrowIfFailed(currentDefaultAdapter->GetDesc(&currentDesc));
+    }
+
+    // If the adapter LUIDs don't match, or if the device reports that it has been removed,
+    // a new D3D device must be created.
+
+    if (previousDesc.AdapterLuid.LowPart != currentDesc.AdapterLuid.LowPart ||
+        previousDesc.AdapterLuid.HighPart != currentDesc.AdapterLuid.HighPart ||
+        m_d3d11Device && FAILED(m_d3d11Device->GetDeviceRemovedReason()) || 
+        m_d3d12Device && FAILED(m_d3d12Device->GetDeviceRemovedReason()))
+    {
+        m_deviceRemoved = true;
+    }
+}
+
+// This method determines the rotation between the display device's native Orientation and the
+// current display orientation.
+DXGI_MODE_ROTATION DX::DeviceResources::ComputeDisplayRotation()
+{
+    DXGI_MODE_ROTATION rotation = DXGI_MODE_ROTATION_UNSPECIFIED;
+
+    // Note: NativeOrientation can only be Landscape or Portrait even though
+    // the DisplayOrientations enum has other values.
+    switch (m_nativeOrientation)
+    {
+    case DisplayOrientations::Landscape:
+        switch (m_currentOrientation)
+        {
+        case DisplayOrientations::Landscape:
+            rotation = DXGI_MODE_ROTATION_IDENTITY;
+            break;
+
+        case DisplayOrientations::Portrait:
+            rotation = DXGI_MODE_ROTATION_ROTATE270;
+            break;
+
+        case DisplayOrientations::LandscapeFlipped:
+            rotation = DXGI_MODE_ROTATION_ROTATE180;
+            break;
+
+        case DisplayOrientations::PortraitFlipped:
+            rotation = DXGI_MODE_ROTATION_ROTATE90;
+            break;
+        }
+        break;
+
+    case DisplayOrientations::Portrait:
+        switch (m_currentOrientation)
+        {
+        case DisplayOrientations::Landscape:
+            rotation = DXGI_MODE_ROTATION_ROTATE90;
+            break;
+
+        case DisplayOrientations::Portrait:
+            rotation = DXGI_MODE_ROTATION_IDENTITY;
+            break;
+
+        case DisplayOrientations::LandscapeFlipped:
+            rotation = DXGI_MODE_ROTATION_ROTATE270;
+            break;
+
+        case DisplayOrientations::PortraitFlipped:
+            rotation = DXGI_MODE_ROTATION_ROTATE180;
+            break;
+        }
+        break;
+    }
+    return rotation;
+}
diff --git a/NativeApp/src/UWP/Common/DeviceResources.h b/NativeApp/src/UWP/Common/DeviceResources.h
new file mode 100644
index 0000000..69fa00c
--- /dev/null
+++ b/NativeApp/src/UWP/Common/DeviceResources.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <dxgi1_4.h>
+#include <d3d12.h>
+#include <d3d11.h>
+#include <DirectXMath.h>
+#include <agile.h>
+
+namespace DX
+{
+    // Controls all the DirectX device resources.
+    class DeviceResources
+    {
+    public:
+        DeviceResources(ID3D11Device *d3d11Device, ID3D12Device *d3d12Device);
+
+        void SetWindow(Windows::UI::Core::CoreWindow^ window);
+        void SetLogicalSize(Windows::Foundation::Size logicalSize);
+        void SetCurrentOrientation(Windows::Graphics::Display::DisplayOrientations currentOrientation);
+        void SetDpi(float dpi);
+        void ValidateDevice();
+        void SetSwapChainRotation(IDXGISwapChain3 *swapChain);
+
+        // The size of the render target, in pixels.
+        Windows::Foundation::Size	GetOutputSize() const				{ return m_outputSize; }
+
+        // The size of the render target, in dips.
+        Windows::Foundation::Size	GetLogicalSize() const				{ return m_logicalSize; }
+
+        float						GetDpi() const						{ return m_effectiveDpi; }
+        bool						IsDeviceRemoved() const				{ return m_deviceRemoved; }
+
+        // D3D Accessors.
+        DirectX::XMFLOAT4X4			GetOrientationTransform3D() const	{ return m_orientationTransform3D; }
+
+        void UpdateRenderTargetSize();
+        UINT GetBackBufferWidth()  {return m_backBufferWidth;}
+        UINT GetBackBufferHeight() {return m_backBufferHeight;}
+
+        Windows::UI::Core::CoreWindow^ GetWindow(){return m_window.Get();}
+
+    private:
+        
+        
+        DXGI_MODE_ROTATION ComputeDisplayRotation();
+
+        bool											m_deviceRemoved;
+
+        // Direct3D objects.
+        Microsoft::WRL::ComPtr<ID3D12Device>			m_d3d12Device;
+        Microsoft::WRL::ComPtr<ID3D11Device>			m_d3d11Device;
+        
+        // Cached reference to the Window.
+        Platform::Agile<Windows::UI::Core::CoreWindow>	m_window;
+
+        // Cached device properties.
+        Windows::Foundation::Size						m_d3dRenderTargetSize;
+        Windows::Foundation::Size						m_outputSize;
+        Windows::Foundation::Size						m_logicalSize;
+        Windows::Graphics::Display::DisplayOrientations	m_nativeOrientation;
+        Windows::Graphics::Display::DisplayOrientations	m_currentOrientation;
+        float											m_dpi;
+        UINT                                            m_backBufferWidth  = 0;
+        UINT                                            m_backBufferHeight = 0;
+
+        // This is the DPI that will be reported back to the app. It takes into account whether the app supports high resolution screens or not.
+        float											m_effectiveDpi;
+
+        // Transforms used for display orientation.
+        DirectX::XMFLOAT4X4								m_orientationTransform3D;
+    };
+}
diff --git a/NativeApp/src/UWP/Common/DirectXHelper.h b/NativeApp/src/UWP/Common/DirectXHelper.h
new file mode 100644
index 0000000..7bfe36f
--- /dev/null
+++ b/NativeApp/src/UWP/Common/DirectXHelper.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include <ppltasks.h>	// For create_task
+
+namespace DX
+{
+    inline void ThrowIfFailed(HRESULT hr)
+    {
+        if (FAILED(hr))
+        {
+            // Set a breakpoint on this line to catch Win32 API errors.
+            throw Platform::Exception::CreateException(hr);
+        }
+    }
+
+    // Function that reads from a binary file asynchronously.
+    inline Concurrency::task<std::vector<byte>> ReadDataAsync(const std::wstring& filename)
+    {
+        using namespace Windows::Storage;
+        using namespace Concurrency;
+
+        auto folder = Windows::ApplicationModel::Package::Current->InstalledLocation;
+
+        return create_task(folder->GetFileAsync(Platform::StringReference(filename.c_str()))).then([](StorageFile^ file)
+        {
+            return FileIO::ReadBufferAsync(file);
+        }).then([](Streams::IBuffer^ fileBuffer) -> std::vector<byte>
+        {
+            std::vector<byte> returnBuffer;
+            returnBuffer.resize(fileBuffer->Length);
+            Streams::DataReader::FromBuffer(fileBuffer)->ReadBytes(Platform::ArrayReference<byte>(returnBuffer.data(), fileBuffer->Length));
+            return returnBuffer;
+        });
+    }
+
+    // Converts a length in device-independent pixels (DIPs) to a length in physical pixels.
+    inline float ConvertDipsToPixels(float dips, float dpi)
+    {
+        static const float dipsPerInch = 96.0f;
+        return floorf(dips * dpi / dipsPerInch + 0.5f); // Round to nearest integer.
+    }
+
+    // Assign a name to the object to aid with debugging.
+#if defined(_DEBUG)
+    inline void SetName(ID3D12Object* pObject, LPCWSTR name)
+    {
+        pObject->SetName(name);
+    }
+#else
+    inline void SetName(ID3D12Object*, LPCWSTR)
+    {
+    }
+#endif
+}
+
+// Naming helper function for ComPtr<T>.
+// Assigns the name of the variable as the name of the object.
+#define NAME_D3D12_OBJECT(x) DX::SetName(x.Get(), L#x)
diff --git a/NativeApp/src/UWP/Common/StepTimer.h b/NativeApp/src/UWP/Common/StepTimer.h
new file mode 100644
index 0000000..c8addbc
--- /dev/null
+++ b/NativeApp/src/UWP/Common/StepTimer.h
@@ -0,0 +1,183 @@
+#pragma once
+
+#include <wrl.h>
+
+namespace DX
+{
+    // Helper class for animation and simulation timing.
+    class StepTimer
+    {
+    public:
+        StepTimer() : 
+            m_elapsedTicks(0),
+            m_totalTicks(0),
+            m_leftOverTicks(0),
+            m_frameCount(0),
+            m_framesPerSecond(0),
+            m_framesThisSecond(0),
+            m_qpcSecondCounter(0),
+            m_isFixedTimeStep(false),
+            m_targetElapsedTicks(TicksPerSecond / 60)
+        {
+            if (!QueryPerformanceFrequency(&m_qpcFrequency))
+            {
+                throw ref new Platform::FailureException();
+            }
+
+            if (!QueryPerformanceCounter(&m_qpcLastTime))
+            {
+                throw ref new Platform::FailureException();
+            }
+
+            // Initialize max delta to 1/10 of a second.
+            m_qpcMaxDelta = m_qpcFrequency.QuadPart / 10;
+        }
+
+        // Get elapsed time since the previous Update call.
+        uint64 GetElapsedTicks() const						{ return m_elapsedTicks; }
+        double GetElapsedSeconds() const					{ return TicksToSeconds(m_elapsedTicks); }
+
+        // Get total time since the start of the program.
+        uint64 GetTotalTicks() const						{ return m_totalTicks; }
+        double GetTotalSeconds() const						{ return TicksToSeconds(m_totalTicks); }
+
+        // Get total number of updates since start of the program.
+        uint32 GetFrameCount() const						{ return m_frameCount; }
+
+        // Get the current framerate.
+        uint32 GetFramesPerSecond() const					{ return m_framesPerSecond; }
+
+        // Set whether to use fixed or variable timestep mode.
+        void SetFixedTimeStep(bool isFixedTimestep)			{ m_isFixedTimeStep = isFixedTimestep; }
+
+        // Set how often to call Update when in fixed timestep mode.
+        void SetTargetElapsedTicks(uint64 targetElapsed)	{ m_targetElapsedTicks = targetElapsed; }
+        void SetTargetElapsedSeconds(double targetElapsed)	{ m_targetElapsedTicks = SecondsToTicks(targetElapsed); }
+
+        // Integer format represents time using 10,000,000 ticks per second.
+        static const uint64 TicksPerSecond = 10000000;
+
+        static double TicksToSeconds(uint64 ticks)			{ return static_cast<double>(ticks) / TicksPerSecond; }
+        static uint64 SecondsToTicks(double seconds)		{ return static_cast<uint64>(seconds * TicksPerSecond); }
+
+        // After an intentional timing discontinuity (for instance a blocking IO operation)
+        // call this to avoid having the fixed timestep logic attempt a set of catch-up 
+        // Update calls.
+
+        void ResetElapsedTime()
+        {
+            if (!QueryPerformanceCounter(&m_qpcLastTime))
+            {
+                throw ref new Platform::FailureException();
+            }
+
+            m_leftOverTicks = 0;
+            m_framesPerSecond = 0;
+            m_framesThisSecond = 0;
+            m_qpcSecondCounter = 0;
+        }
+
+        // Update timer state, calling the specified Update function the appropriate number of times.
+        template<typename TUpdate>
+        void Tick(const TUpdate& update)
+        {
+            // Query the current time.
+            LARGE_INTEGER currentTime;
+
+            if (!QueryPerformanceCounter(&currentTime))
+            {
+                throw ref new Platform::FailureException();
+            }
+
+            uint64 timeDelta = currentTime.QuadPart - m_qpcLastTime.QuadPart;
+
+            m_qpcLastTime = currentTime;
+            m_qpcSecondCounter += timeDelta;
+
+            // Clamp excessively large time deltas (e.g. after paused in the debugger).
+            if (timeDelta > m_qpcMaxDelta)
+            {
+                timeDelta = m_qpcMaxDelta;
+            }
+
+            // Convert QPC units into a canonical tick format. This cannot overflow due to the previous clamp.
+            timeDelta *= TicksPerSecond;
+            timeDelta /= m_qpcFrequency.QuadPart;
+
+            uint32 lastFrameCount = m_frameCount;
+
+            if (m_isFixedTimeStep)
+            {
+                // Fixed timestep update logic
+
+                // If the app is running very close to the target elapsed time (within 1/4 of a millisecond) just clamp
+                // the clock to exactly match the target value. This prevents tiny and irrelevant errors
+                // from accumulating over time. Without this clamping, a game that requested a 60 fps
+                // fixed update, running with vsync enabled on a 59.94 NTSC display, would eventually
+                // accumulate enough tiny errors that it would drop a frame. It is better to just round 
+                // small deviations down to zero to leave things running smoothly.
+
+                if (abs(static_cast<int64>(timeDelta - m_targetElapsedTicks)) < TicksPerSecond / 4000)
+                {
+                    timeDelta = m_targetElapsedTicks;
+                }
+
+                m_leftOverTicks += timeDelta;
+
+                while (m_leftOverTicks >= m_targetElapsedTicks)
+                {
+                    m_elapsedTicks = m_targetElapsedTicks;
+                    m_totalTicks += m_targetElapsedTicks;
+                    m_leftOverTicks -= m_targetElapsedTicks;
+                    m_frameCount++;
+
+                    update();
+                }
+            }
+            else
+            {
+                // Variable timestep update logic.
+                m_elapsedTicks = timeDelta;
+                m_totalTicks += timeDelta;
+                m_leftOverTicks = 0;
+                m_frameCount++;
+
+                update();
+            }
+
+            // Track the current framerate.
+            if (m_frameCount != lastFrameCount)
+            {
+                m_framesThisSecond++;
+            }
+
+            if (m_qpcSecondCounter >= static_cast<uint64>(m_qpcFrequency.QuadPart))
+            {
+                m_framesPerSecond = m_framesThisSecond;
+                m_framesThisSecond = 0;
+                m_qpcSecondCounter %= m_qpcFrequency.QuadPart;
+            }
+        }
+
+    private:
+        // Source timing data uses QPC units.
+        LARGE_INTEGER m_qpcFrequency;
+        LARGE_INTEGER m_qpcLastTime;
+        uint64 m_qpcMaxDelta;
+
+        // Derived timing data uses a canonical tick format.
+        uint64 m_elapsedTicks;
+        uint64 m_totalTicks;
+        uint64 m_leftOverTicks;
+
+        // Members for tracking the framerate.
+        uint32 m_frameCount;
+        uint32 m_framesPerSecond;
+        uint32 m_framesThisSecond;
+        uint64 m_qpcSecondCounter;
+
+        // Members for configuring fixed timestep mode.
+        bool m_isFixedTimeStep;
+        uint64 m_targetElapsedTicks;
+    };
+}
diff --git a/NativeApp/src/UWP/UWPAppBase.cpp b/NativeApp/src/UWP/UWPAppBase.cpp
new file mode 100644
index 0000000..346b2bd
--- /dev/null
+++ b/NativeApp/src/UWP/UWPAppBase.cpp
@@ -0,0 +1,50 @@
+/*     Copyright 2015-2018 Egor Yusov
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include "UWPAppBase.h"
+
+namespace Diligent
+{
+
+UWPAppBase::UWPAppBase()
+{
+    // TODO: Change the timer settings if you want something other than the default variable timestep mode.
+    // e.g. for 60 FPS fixed timestep update logic, call:
+    /*
+    m_timer.SetFixedTimeStep(true);
+    m_timer.SetTargetElapsedSeconds(1.0 / 60);
+    */
+}
+
+void UWPAppBase::Update()
+{
+    // Update scene objects.
+    m_timer.Tick([&]()
+    {
+        auto CurrTime = m_timer.GetTotalSeconds();
+        auto ElapsedTime = m_timer.GetElapsedSeconds();
+        Update(CurrTime, ElapsedTime);
+    });
+}
+
+}
diff --git a/NativeApp/src/UWP/dummy.cpp b/NativeApp/src/UWP/dummy.cpp
new file mode 100644
index 0000000..5caae53
--- /dev/null
+++ b/NativeApp/src/UWP/dummy.cpp
@@ -0,0 +1,7 @@
+#include "AppBase.h"
+
+// This dummy file is only required for the NativeAppBase.lib to be created, 
+// which is required to avoid linker error
+
+// We cannot add real source to this library because Windows Runtime types cannot 
+// be included into static libraries
\ No newline at end of file
diff --git a/NativeApp/src/Win32/WinMain.cpp b/NativeApp/src/Win32/WinMain.cpp
new file mode 100644
index 0000000..8f63460
--- /dev/null
+++ b/NativeApp/src/Win32/WinMain.cpp
@@ -0,0 +1,168 @@
+/*     Copyright 2019 Diligent Graphics LLC
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include <memory>
+#include <iomanip>
+#include <Windows.h>
+#include <crtdbg.h>
+#include "NativeAppBase.h"
+#include "StringTools.h"
+#include "Timer.h"
+
+using namespace Diligent;
+
+std::unique_ptr<NativeAppBase> g_pTheApp;
+
+LRESULT CALLBACK MessageProc(HWND, UINT, WPARAM, LPARAM);
+// Main
+int WINAPI WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int cmdShow)
+{
+#if defined(_DEBUG) || defined(DEBUG)
+    _CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
+#endif
+
+    g_pTheApp.reset( CreateApplication() );
+
+    const auto* cmdLine = GetCommandLineA();
+    g_pTheApp->ProcessCommandLine(cmdLine);
+
+    const auto* AppTitle = g_pTheApp->GetAppTitle();
+
+#ifdef UNICODE
+    const auto* const WindowClassName =   L"SampleApp";
+#else
+    const auto* const WindowClassName =   "SampleApp";
+#endif
+
+    // Register our window class
+    WNDCLASSEX wcex = { sizeof(WNDCLASSEX), CS_HREDRAW|CS_VREDRAW, MessageProc,
+                        0L, 0L, instance, NULL, NULL, NULL, NULL, WindowClassName, NULL };
+    RegisterClassEx(&wcex);
+
+    int DesiredWidth = 0;
+    int DesiredHeight = 0;
+    g_pTheApp->GetDesiredInitialWindowSize(DesiredWidth, DesiredHeight);
+    // Create a window
+    LONG WindowWidth  = DesiredWidth  > 0 ? DesiredWidth  : 1280;
+    LONG WindowHeight = DesiredHeight > 0 ? DesiredHeight : 1024;
+    RECT rc = { 0, 0, WindowWidth, WindowHeight };
+    AdjustWindowRect(&rc, WS_OVERLAPPEDWINDOW, FALSE);
+    HWND wnd = CreateWindowA("SampleApp", AppTitle,
+                            WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 
+                            rc.right-rc.left, rc.bottom-rc.top, NULL, NULL, instance, NULL);
+    if (!wnd)
+    {
+        MessageBoxA(NULL, "Cannot create window", "Error", MB_OK|MB_ICONERROR);
+        return 0;
+    }
+    ShowWindow(wnd, cmdShow);
+    UpdateWindow(wnd);
+    
+    g_pTheApp->OnWindowCreated(wnd, WindowWidth, WindowHeight);
+    AppTitle = g_pTheApp->GetAppTitle();
+
+    Diligent::Timer Timer;
+    auto PrevTime = Timer.GetElapsedTime();
+    double filteredFrameTime = 0.0;
+
+    // Main message loop
+    MSG msg = {0};
+    while (WM_QUIT != msg.message)
+    {
+        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
+        {
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+        }
+        else
+        {
+            auto CurrTime = Timer.GetElapsedTime();
+            auto ElapsedTime = CurrTime - PrevTime;
+            PrevTime = CurrTime;
+            g_pTheApp->Update(CurrTime, ElapsedTime);
+
+            g_pTheApp->Render();
+
+            g_pTheApp->Present();
+
+            double filterScale = 0.2;
+            filteredFrameTime = filteredFrameTime * (1.0 - filterScale) + filterScale * ElapsedTime;
+            std::stringstream fpsCounterSS;
+            fpsCounterSS << AppTitle << " - " << std::fixed << std::setprecision(1) << filteredFrameTime * 1000;
+            fpsCounterSS << " ms (" << 1.0 / filteredFrameTime << " fps)";
+            SetWindowTextA(wnd, fpsCounterSS.str().c_str());
+        }
+    }
+    
+    g_pTheApp.reset();
+
+    return (int)msg.wParam;
+}
+
+// Called every time the NativeNativeAppBase receives a message
+LRESULT CALLBACK MessageProc(HWND wnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    if(g_pTheApp)
+    {
+        auto res = g_pTheApp->HandleWin32Message(wnd, message, wParam, lParam);
+        if (res != 0)
+            return res;
+    }
+
+    switch (message) 
+    {
+        case WM_PAINT:
+            {
+                PAINTSTRUCT ps;
+                BeginPaint(wnd, &ps);
+                EndPaint(wnd, &ps);
+                return 0;
+            }
+        case WM_SIZE: // Window size has been changed
+            if( g_pTheApp )
+            {
+                g_pTheApp->WindowResize(LOWORD(lParam), HIWORD(lParam));
+            }
+            return 0;
+
+        case WM_CHAR:
+            if (wParam == VK_ESCAPE)
+                PostQuitMessage(0);
+            return 0;
+
+        case WM_DESTROY:
+            PostQuitMessage(0);
+            return 0;
+
+        case WM_GETMINMAXINFO:
+        {
+            LPMINMAXINFO lpMMI = (LPMINMAXINFO)lParam;
+            lpMMI->ptMinTrackSize.x = 320;
+            lpMMI->ptMinTrackSize.y = 240;
+            return 0;
+        }
+
+        default:
+            return DefWindowProc(wnd, message, wParam, lParam);
+    }
+}