Video mode changing

- added video mode querying & changing
- added joystick querying & changing
- cleaned up CApplication interface

11 files changed, 580 insertions, 222 deletions

diff --git a/src/app/app.cpp b/src/app/app.cpp
index c778a63..5c6ef49 100644
--- a/src/app/app.cpp
+++ b/src/app/app.cpp
@@ -56,19 +56,14 @@ struct ApplicationPrivate
     SDL_Event currentEvent;
     //! Joystick
     SDL_Joystick *joystick;
-    //! Index of joystick device
-    int joystickIndex;
     //! Id of joystick timer
     SDL_TimerID joystickTimer;
-    //! Current configuration of OpenGL display device
-    Gfx::GLDeviceConfig deviceConfig;
 
     ApplicationPrivate()
     {
         memset(&currentEvent, 0, sizeof(SDL_Event));
         surface = NULL;
         joystick = NULL;
-        joystickIndex = 0;
         joystickTimer = 0;
     }
 };
@@ -77,11 +72,8 @@ struct ApplicationPrivate
 
 CApplication::CApplication()
 {
-    m_private = new ApplicationPrivate();
-    m_exitCode = 0;
-
-    m_iMan = new CInstanceManager();
-
+    m_private    = new ApplicationPrivate();
+    m_iMan       = new CInstanceManager();
     m_eventQueue = new CEventQueue(m_iMan);
 
     m_engine    = NULL;
@@ -90,21 +82,16 @@ CApplication::CApplication()
     m_sound     = NULL;
 
     m_keyState = 0;
-    m_axeKey = Math::Vector(0.0f, 0.0f, 0.0f);
-    m_axeJoy = Math::Vector(0.0f, 0.0f, 0.0f);
-
-    m_active          = false;
-    m_activateApp     = false;
-    m_ready           = false;
-    m_joystickEnabled = false;
+    m_axeKey   = Math::Vector(0.0f, 0.0f, 0.0f);
+    m_axeJoy   = Math::Vector(0.0f, 0.0f, 0.0f);
 
-    m_time        = 0.0f;
+    m_exitCode  = 0;
+    m_active    = false;
+    m_debugMode = false;
 
-    m_windowTitle  = "COLOBOT";
+    m_windowTitle = "COLOBOT";
 
-    m_showStats      = false;
-    m_debugMode      = false;
-    m_setupMode      = true;
+    m_joystickEnabled = false;
 
     m_dataPath = "./data";
 
@@ -139,7 +126,6 @@ bool CApplication::ParseArguments(int argc, char *argv[])
 
         if (arg == "-debug")
         {
-            m_showStats = true;
             SetDebugMode(true);
         }
         else if (arg == "-datadir")
@@ -165,7 +151,7 @@ bool CApplication::Create()
     // TODO: verify that data directory exists
 
     // Temporarily -- only in windowed mode
-    m_private->deviceConfig.fullScreen = false;
+    m_deviceConfig.fullScreen = false;
 
     // Create the 3D engine
     m_engine = new Gfx::CEngine(m_iMan, this);
@@ -186,71 +172,30 @@ bool CApplication::Create()
 
     if (SDL_Init(initFlags) < 0)
     {
-        SystemDialog( SDT_ERROR, "COLOBOT - Error", "SDL initialization error:\n" +
-                                                    std::string(SDL_GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBOT - Fatal Error",
+                      "SDL initialization error:\n" +
+                      std::string(SDL_GetError()) );
         m_exitCode = 2;
         return false;
     }
 
     if ((IMG_Init(IMG_INIT_PNG) & IMG_INIT_PNG) == 0)
     {
-        SystemDialog( SDT_ERROR, "COLOBOT - Error", std::string("SDL_Image initialization error:\n") +
-                                                    std::string(IMG_GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBOT - Fatal Error",
+                      std::string("SDL_Image initialization error:\n") +
+                      std::string(IMG_GetError()) );
         m_exitCode = 3;
         return false;
     }
 
-    const SDL_VideoInfo *videoInfo = SDL_GetVideoInfo();
-    if (videoInfo == NULL)
-    {
-        SystemDialog( SDT_ERROR, "COLOBOT - Error", "SDL error while getting video info:\n " +
-                                                    std::string(SDL_GetError()) );
-        m_exitCode = 2;
-        return false;
-    }
-
-    Uint32 videoFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE;
-
-    if (m_private->deviceConfig.resizeable)
-        videoFlags |= SDL_RESIZABLE;
-
-    // Use hardware surface if available
-    if (videoInfo->hw_available)
-        videoFlags |= SDL_HWSURFACE;
-    else
-        videoFlags |= SDL_SWSURFACE;
-
-    // Enable hardware blit if available
-    if (videoInfo->blit_hw)
-        videoFlags |= SDL_HWACCEL;
-
-    if (m_private->deviceConfig.fullScreen)
-        videoFlags |= SDL_FULLSCREEN;
-
-    // Set OpenGL attributes
-
-    SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   m_private->deviceConfig.redSize);
-    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, m_private->deviceConfig.greenSize);
-    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  m_private->deviceConfig.blueSize);
-    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, m_private->deviceConfig.alphaSize);
-
-    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, m_private->deviceConfig.depthSize);
-
-    if (m_private->deviceConfig.doubleBuf)
-        SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
-
-    /* If hardware acceleration specifically requested, this will force the hw accel
-       and fail with error if not available */
-    if (m_private->deviceConfig.hardwareAccel)
-        SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
-
-    m_private->surface = SDL_SetVideoMode(m_private->deviceConfig.width, m_private->deviceConfig.height,
-                                          m_private->deviceConfig.bpp, videoFlags);
+    if (! CreateVideoSurface())
+        return false; // dialog is in function
 
     if (m_private->surface == NULL)
     {
-        SystemDialog( SDT_ERROR, "COLOBT - Error", std::string("SDL error while setting video mode:\n") +
-                                                   std::string(SDL_GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBT - Fatal Error",
+                      std::string("SDL error while setting video mode:\n") +
+                      std::string(SDL_GetError()) );
         m_exitCode = 2;
         return false;
     }
@@ -269,11 +214,12 @@ bool CApplication::Create()
 
 
     // The video is ready, we can create and initalize the graphics device
-    m_device = new Gfx::CGLDevice();
+    m_device = new Gfx::CGLDevice(m_deviceConfig);
     if (! m_device->Create() )
     {
-        SystemDialog( SDT_ERROR, "COLOBT - Error", std::string("Error in CDevice::Create() :\n") +
-                                                   std::string(m_device->GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBT - Fatal Error",
+                      std::string("Error in CDevice::Create() :\n") +
+                      std::string(m_device->GetError()) );
         m_exitCode = 1;
         return false;
     }
@@ -281,23 +227,74 @@ bool CApplication::Create()
     m_engine->SetDevice(m_device);
     if (! m_engine->Create() )
     {
-        SystemDialog( SDT_ERROR, "COLOBT - Error", std::string("Error in CEngine::Create() :\n") +
-                                                   std::string(m_engine->GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBT - Fatal Error",
+                      std::string("Error in CEngine::Create() :\n") +
+                      std::string(m_engine->GetError()) );
         m_exitCode = 1;
         return false;
     }
 
     if (! m_engine->AfterDeviceSetInit() )
     {
-        SystemDialog( SDT_ERROR, "COLOBT - Error", std::string("Error in CEngine::AfterDeviceSetInit() :\n") +
-                                                   std::string(m_engine->GetError()) );
+        SystemDialog( SDT_ERROR, "COLOBT - Fatal Error",
+                      std::string("Error in CEngine::AfterDeviceSetInit() :\n") +
+                      std::string(m_engine->GetError()) );
         m_exitCode = 1;
         return false;
     }
 
+    return true;
+}
+
+bool CApplication::CreateVideoSurface()
+{
+    const SDL_VideoInfo *videoInfo = SDL_GetVideoInfo();
+    if (videoInfo == NULL)
+    {
+        SystemDialog( SDT_ERROR, "COLOBOT - Fatal Error",
+                      std::string("SDL error while getting video info:\n ") +
+                      std::string(SDL_GetError()) );
+        m_exitCode = 2;
+        return false;
+    }
+
+    Uint32 videoFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE;
+
+    // Use hardware surface if available
+    if (videoInfo->hw_available)
+        videoFlags |= SDL_HWSURFACE;
+    else
+        videoFlags |= SDL_SWSURFACE;
+
+    // Enable hardware blit if available
+    if (videoInfo->blit_hw)
+        videoFlags |= SDL_HWACCEL;
+
+    if (m_deviceConfig.fullScreen)
+        videoFlags |= SDL_FULLSCREEN;
+
+    if (m_deviceConfig.resizeable)
+        videoFlags |= SDL_RESIZABLE;
+
+    // Set OpenGL attributes
+
+    SDL_GL_SetAttribute(SDL_GL_RED_SIZE,   m_deviceConfig.redSize);
+    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, m_deviceConfig.greenSize);
+    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  m_deviceConfig.blueSize);
+    SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, m_deviceConfig.alphaSize);
+
+    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, m_deviceConfig.depthSize);
+
+    if (m_deviceConfig.doubleBuf)
+        SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+    /* If hardware acceleration specifically requested, this will force the hw accel
+       and fail with error if not available */
+    if (m_deviceConfig.hardwareAccel)
+        SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
 
-    // The app is ready to go
-    m_ready = true;
+    m_private->surface = SDL_SetVideoMode(m_deviceConfig.size.w, m_deviceConfig.size.h,
+                                          m_deviceConfig.bpp, videoFlags);
 
     return true;
 }
@@ -351,15 +348,73 @@ void CApplication::Destroy()
     SDL_Quit();
 }
 
+bool CApplication::ChangeVideoConfig(const Gfx::GLDeviceConfig &newConfig)
+{
+    static bool restore = false;
+
+    m_lastDeviceConfig = m_deviceConfig;
+    m_deviceConfig = newConfig;
+
+
+    SDL_FreeSurface(m_private->surface);
+
+    if (! CreateVideoSurface())
+    {
+        // Fatal error, so post the quit event
+        m_eventQueue->AddEvent(Event(EVENT_QUIT));
+        return false;
+    }
+
+    if (m_private->surface == NULL)
+    {
+        if (! restore)
+        {
+            SystemDialog( SDT_ERROR, "COLOBT - Error",
+                          std::string("SDL error while setting video mode:\n") +
+                          std::string(SDL_GetError()) + std::string("\n") +
+                          std::string("Previous mode will be restored") );
+
+            restore = true;
+            ChangeVideoConfig(m_lastDeviceConfig);
+            return false;
+        }
+        else
+        {
+            restore = false;
+
+            SystemDialog( SDT_ERROR, "COLOBT - Fatal Error",
+                          std::string("SDL error while restoring previous video mode:\n") +
+                          std::string(SDL_GetError()) );
+
+
+            // Fatal error, so post the quit event
+            m_eventQueue->AddEvent(Event(EVENT_QUIT));
+            return false;
+        }
+    }
+
+    ( static_cast<Gfx::CGLDevice*>(m_device) )->ConfigChanged(m_deviceConfig);
+
+    m_engine->ResetAfterDeviceChanged();
+
+    return true;
+}
+
 bool CApplication::OpenJoystick()
 {
-    m_private->joystick = SDL_JoystickOpen(m_private->joystickIndex);
+    if ( (m_joystick.index < 0) || (m_joystick.index >= SDL_NumJoysticks()) )
+        return false;
+
+    m_private->joystick = SDL_JoystickOpen(m_joystick.index);
     if (m_private->joystick == NULL)
         return false;
 
+    m_joystick.axisCount   = SDL_JoystickNumAxes(m_private->joystick);
+    m_joystick.buttonCount = SDL_JoystickNumButtons(m_private->joystick);
+
     // Create the vectors with joystick axis & button states to exactly the required size
-    m_joyAxeState = std::vector<int>(SDL_JoystickNumAxes(m_private->joystick), 0);
-    m_joyButtonState = std::vector<bool>(SDL_JoystickNumButtons(m_private->joystick), false);
+    m_joyAxeState = std::vector<int>(m_joystick.axisCount, 0);
+    m_joyButtonState = std::vector<bool>(m_joystick.buttonCount, false);
 
     // Create a timer for polling joystick state
     m_private->joystickTimer = SDL_AddTimer(JOYSTICK_TIMER_INTERVAL, JoystickTimerCallback, NULL);
@@ -367,7 +422,6 @@ bool CApplication::OpenJoystick()
     return true;
 }
 
-
 void CApplication::CloseJoystick()
 {
     // Timer will remove itself automatically
@@ -376,6 +430,17 @@ void CApplication::CloseJoystick()
     m_private->joystick = NULL;
 }
 
+bool CApplication::ChangeJoystick(const JoystickDevice &newJoystick)
+{
+    if ( (newJoystick.index < 0) || (newJoystick.index >= SDL_NumJoysticks()) )
+        return false;
+
+    if (m_private->joystick != NULL)
+        CloseJoystick();
+
+    return OpenJoystick();
+}
+
 Uint32 JoystickTimerCallback(Uint32 interval, void *)
 {
     CApplication *app = CApplication::GetInstancePointer();
@@ -452,6 +517,8 @@ int CApplication::Run()
         // To be sure no old event remains
         m_private->currentEvent.type = SDL_NOEVENT;
 
+        // Call SDL_PumpEvents() only once here
+        // (SDL_PeepEvents() doesn't call it)
         if (m_active)
             SDL_PumpEvents();
 
@@ -462,11 +529,11 @@ int CApplication::Run()
 
             int count = 0;
             // Use SDL_PeepEvents() if the app is active, so we can use idle time to
-            // render the scene. Else, use SDL_PollEvent() to avoid eating CPU time.
+            // render the scene. Else, use SDL_WaitEvent() to avoid eating CPU time.
             if (m_active)
                 count = SDL_PeepEvents(&m_private->currentEvent, 1, SDL_GETEVENT, SDL_ALLEVENTS);
             else
-                count = SDL_PollEvent(&m_private->currentEvent);
+                count = SDL_WaitEvent(&m_private->currentEvent);
 
             // If received an event
             if (count > 0)
@@ -492,7 +559,7 @@ int CApplication::Run()
         }
 
         // Enter game update & frame rendering only if active
-        if (m_active && m_ready)
+        if (m_active)
         {
             Event event;
             while (m_eventQueue->GetEvent(event))
@@ -554,14 +621,14 @@ PressState TranslatePressState(unsigned char state)
      - y: 0=down, 1=up */
 Math::Point CApplication::WindowToInterfaceCoords(Math::IntPoint pos)
 {
-    return Math::Point(       (float)pos.x / (float)m_private->deviceConfig.width,
-                       1.0f - (float)pos.y / (float)m_private->deviceConfig.height);
+    return Math::Point(       (float)pos.x / (float)m_deviceConfig.size.w,
+                       1.0f - (float)pos.y / (float)m_deviceConfig.size.h);
 }
 
 Math::IntPoint CApplication::InterfaceToWindowCoords(Math::Point pos)
 {
-    return Math::IntPoint((int)(pos.x * m_private->deviceConfig.width),
-                          (int)((1.0f - pos.y) * m_private->deviceConfig.height));
+    return Math::IntPoint((int)(pos.x * m_deviceConfig.size.w),
+                          (int)((1.0f - pos.y) * m_deviceConfig.size.h));
 }
 
 /** The SDL event parsed is stored internally.
@@ -626,6 +693,19 @@ Event CApplication::ParseEvent()
         event.joyButton.button = m_private->currentEvent.jbutton.button;
         event.joyButton.state = TranslatePressState(m_private->currentEvent.jbutton.state);
     }
+    else if (m_private->currentEvent.type == SDL_ACTIVEEVENT)
+    {
+        event.type = EVENT_ACTIVE;
+
+        if (m_private->currentEvent.active.type & SDL_APPINPUTFOCUS)
+            event.active.flags |= ACTIVE_INPUT;
+        if (m_private->currentEvent.active.type & SDL_APPMOUSEFOCUS)
+            event.active.flags |= ACTIVE_MOUSE;
+        if (m_private->currentEvent.active.type & SDL_APPACTIVE)
+            event.active.flags |= ACTIVE_APP;
+
+        event.active.gain = m_private->currentEvent.active.gain == 1;
+    }
 
     return event;
 }
@@ -636,6 +716,14 @@ Event CApplication::ParseEvent()
 bool CApplication::ProcessEvent(const Event &event)
 {
     CLogger *l = GetLogger();
+
+    if (event.type == EVENT_ACTIVE)
+    {
+        m_active = event.active.gain;
+        if (m_debugMode)
+            l->Info("Focus change: active = %s\n", m_active ? "true" : "false");
+    }
+
     // Print the events in debug mode to test the code
     if (m_debugMode)
     {
@@ -672,6 +760,11 @@ bool CApplication::ProcessEvent(const Event &event)
                 l->Info(" button = %d\n", event.joyButton.button);
                 l->Info(" state  = %s\n", (event.joyButton.state == STATE_PRESSED) ? "STATE_PRESSED" : "STATE_RELEASED");
                 break;
+            case EVENT_ACTIVE:
+                l->Info("EVENT_ACTIVE:\n");
+                l->Info(" flags = 0x%x\n", event.active.flags);
+                l->Info(" gain  = %s\n", event.active.gain ? "true" : "false");
+                break;
             default:
                 break;
         }
@@ -688,48 +781,58 @@ bool CApplication::Render()
     if (! result)
         return false;
 
-    if (m_private->deviceConfig.doubleBuf)
+    if (m_deviceConfig.doubleBuf)
         SDL_GL_SwapBuffers();
 
     return true;
 }
 
-/** Called in to toggle the pause state of the app. */
-void CApplication::Pause(bool pause)
-{
-    static long appPausedCount = 0L;
-
-    appPausedCount += ( pause ? +1 : -1 );
-    m_ready         = appPausedCount == 0;
-
-    // Handle the first pause request (of many, nestable pause requests)
-    if( pause && ( 1 == appPausedCount ) )
-    {
-        // Stop the scene from animating
-        //m_engine->TimeEnterGel();
-    }
-
-    // Final pause request done
-    if (appPausedCount == 0)
-    {
-        // Restart the scene
-        //m_engine->TimeExitGel();
-    }
-}
-
 void CApplication::StepSimulation(float rTime)
 {
     // TODO
 }
 
-void CApplication::SetShowStat(bool show)
+VideoQueryResult CApplication::GetVideoResolutionList(std::vector<Math::IntSize> &resolutions,
+                                                      bool fullScreen, bool resizeable)
 {
-    m_showStats = show;
-}
+    resolutions.clear();
 
-bool CApplication::GetShowStat()
-{
-    return m_showStats;
+    const SDL_VideoInfo *videoInfo = SDL_GetVideoInfo();
+    if (videoInfo == NULL)
+        return VIDEO_QUERY_ERROR;
+
+    Uint32 videoFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE;
+
+    // Use hardware surface if available
+    if (videoInfo->hw_available)
+        videoFlags |= SDL_HWSURFACE;
+    else
+        videoFlags |= SDL_SWSURFACE;
+
+    // Enable hardware blit if available
+    if (videoInfo->blit_hw)
+        videoFlags |= SDL_HWACCEL;
+
+    if (resizeable)
+        videoFlags |= SDL_RESIZABLE;
+
+    if (fullScreen)
+        videoFlags |= SDL_FULLSCREEN;
+
+
+    SDL_Rect **modes = SDL_ListModes(NULL, videoFlags);
+
+    if (modes == (SDL_Rect **)0)
+        return VIDEO_QUERY_NONE; // no modes available
+
+    if (modes == (SDL_Rect **)-1)
+        return VIDEO_QUERY_ALL; // all resolutions are possible
+
+
+    for (int i = 0; modes[i] != NULL; ++i)
+        resolutions.push_back(Math::IntSize(modes[i]->w, modes[i]->h));
+
+    return VIDEO_QUERY_OK;
 }
 
 void CApplication::SetDebugMode(bool mode)
@@ -742,11 +845,6 @@ bool CApplication::GetDebugMode()
     return m_debugMode;
 }
 
-bool CApplication::GetSetupMode()
-{
-    return m_setupMode;
-}
-
 void CApplication::FlushPressKey()
 {
     // TODO
@@ -803,6 +901,28 @@ Math::Point CApplication::GetSystemMousePos()
     return m_systemMousePos;
 }
 
+std::vector<JoystickDevice> CApplication::GetJoystickList()
+{
+    std::vector<JoystickDevice> result;
+
+    int count = SDL_NumJoysticks();
+
+    for (int index = 0; index < count; ++index)
+    {
+        JoystickDevice device;
+        device.index = index;
+        device.name = SDL_JoystickName(index);
+        result.push_back(device);
+    }
+
+    return result;
+}
+
+JoystickDevice CApplication::GetJoystick()
+{
+    return m_joystick;
+}
+
 void CApplication::SetJoystickEnabled(bool enable)
 {
     m_joystickEnabled = enable;
@@ -825,32 +945,6 @@ bool CApplication::GetJoystickEnabled()
     return m_joystickEnabled;
 }
 
-bool CApplication::WriteScreenShot(char *filename, int width, int height)
-{
-    // TODO
-    return false;
-}
-
-void CApplication::InitText()
-{
-    // TODO
-}
-
-void CApplication::DrawSuppl()
-{
-    // TODO
-}
-
-void CApplication::ShowStats()
-{
-    // TODO
-}
-
-void CApplication::OutputText(long x, long y, char* str)
-{
-    // TODO
-}
-
 std::string CApplication::GetDataFilePath(const std::string& dirName, const std::string& fileName)
 {
     return m_dataPath + "/" + dirName + "/" + fileName;
diff --git a/src/app/app.h b/src/app/app.h
index 956eab8..483aa55 100644
--- a/src/app/app.h
+++ b/src/app/app.h
@@ -24,6 +24,8 @@
 #include "common/singleton.h"
 #include "graphics/core/device.h"
 #include "graphics/engine/engine.h"
+#include "graphics/opengl/gldevice.h"
+#include "math/intsize.h"
 
 #include <string>
 #include <vector>
@@ -34,6 +36,35 @@ class CEvent;
 class CRobotMain;
 class CSound;
 
+/**
+  \struct JoystickDevice
+  \brief Information about a joystick device */
+struct JoystickDevice
+{
+    //! Device index (-1 = invalid device)
+    int index;
+    //! Device name
+    std::string name;
+    //! Number of axes (only available after joystick opened)
+    int axisCount;
+    //! Number of buttons (only available after joystick opened)
+    int buttonCount;
+
+    JoystickDevice()
+        : index(-1), axisCount(0), buttonCount(0) {}
+};
+
+/**
+  \enum VideoQueryResult
+  \brief Result of querying for available video resolutions */
+enum VideoQueryResult
+{
+    VIDEO_QUERY_ERROR,
+    VIDEO_QUERY_NONE,
+    VIDEO_QUERY_ALL,
+    VIDEO_QUERY_OK
+};
+
 
 struct ApplicationPrivate;
 
@@ -46,26 +77,38 @@ struct ApplicationPrivate;
  *
  * It is a singleton class with only one instance that can be created.
  *
- * Creation of other main objects
+ * \section Creation Creation of other main objects
  *
  * The class creates the only instance of CInstanceManager, CEventQueue, CEngine,
  * CRobotMain and CSound classes.
  *
- * Window management
+ * \section Window Window management
  *
  * The class is responsible for creating app window, setting and changing the video mode,
- * setting the position of mouse and changing the cursor, grabbing and writing screenshots.
+ * joystick management, grabbing input and changing the system mouse cursor
+ * position and visibility.
+ * ("System mouse cursor" means the cursor displayed by the OS in constrast to the cursor
+ * displayed by CEngine).
+ *
+ * \section Events Events
  *
- * Events
+ * Events are taken from SDL event queue, translated to common events from src/common.h
+ * and pushed to global event queue CEventQueue.
  *
- * Events are taken from SDL event queue and either handled by CApplication or translated
- * to common events from src/common.h and pushed to global event queue CEventQueue.
  * Joystick events are generated somewhat differently, by running a separate timer,
  * polling the device for changes and synthesising events on change. It avoids flooding
  * the event queue with too many joystick events and the granularity of the timer can be
  * adjusted.
  *
- * The events are further handled in CRobotMain class.
+ * The events are passed to ProcessEvent() of classes in this order: CApplication, CEngine
+ * and CRobotMain. CApplication and CEngine's ProcessEvent() functions return bool, which
+ * means whether to pass the event on, or stop the chain. This is to enable handling some
+ * events which are internal to CApplication or CEngine.
+ *
+ * \section Portability Portability
+ *
+ * Currently, the class only handles OpenGL devices. SDL can be used with DirectX, but
+ * for that to work, video initialization and video setting must be done differently.
  *
  */
 class CApplication : public CSingleton<CApplication>
@@ -89,26 +132,36 @@ public:
     //! Cleans up before exit
     void        Destroy();
 
-    //! Enters the pause mode
-    void        Pause(bool pause);
+    //! Returns a list of possible video modes
+    VideoQueryResult GetVideoResolutionList(std::vector<Math::IntSize> &resolutions,
+                                            bool fullScreen, bool resizeable);
+
+    //! Returns the current video mode
+    Gfx::GLDeviceConfig GetVideoConfig();
+
+    //! Change the video mode to given mode
+    bool        ChangeVideoConfig(const Gfx::GLDeviceConfig &newConfig);
 
     //! Updates the simulation state
     void        StepSimulation(float rTime);
 
-    //! Polls the state of joystick axes and buttons
-    void        UpdateJoystick();
-
-    void        SetShowStat(bool show);
-    bool        GetShowStat();
+    //! Returns a list of available joystick devices
+    std::vector<JoystickDevice> GetJoystickList();
 
-    void        SetDebugMode(bool mode);
-    bool        GetDebugMode();
+    //! Returns info about the current joystick
+    JoystickDevice GetJoystick();
 
-    bool        GetSetupMode();
+    //! Change the current joystick device
+    bool        ChangeJoystick(const JoystickDevice &newJoystick);
 
+    //! Enables/disables joystick
     void        SetJoystickEnabled(bool enable);
+    //! Returns whether joystick is enabled
     bool        GetJoystickEnabled();
 
+    //! Polls the state of joystick axes and buttons
+    void        UpdateJoystick();
+
     void        FlushPressKey();
     void        ResetKey();
     void        SetKey(int keyRank, int option, int key);
@@ -129,12 +182,18 @@ public:
     //! Returns the position of system mouse cursor (in interface coords)
     Math::Point GetSystemMousePos();
 
-    bool        WriteScreenShot(char *filename, int width, int height);
+    //! Enables/disables debug mode (prints more info in logger)
+    void        SetDebugMode(bool mode);
+    //! Returns whether debug mode is enabled
+    bool        GetDebugMode();
 
     //! Returns the full path to a file in data directory
     std::string GetDataFilePath(const std::string &dirName, const std::string &fileName);
 
 protected:
+    //! Creates the window's SDL_Surface
+    bool CreateVideoSurface();
+
     //! Processes the captured SDL event to Event struct
     Event       ParseEvent();
     //! Handles some incoming events
@@ -152,11 +211,6 @@ protected:
     //! Converts the interface coords to window coords
     Math::IntPoint InterfaceToWindowCoords(Math::Point pos);
 
-    void        InitText();
-    void        DrawSuppl();
-    void        ShowStats();
-    void        OutputText(long x, long y, char* str);
-
 protected:
     //! Instance manager
     CInstanceManager*       m_iMan;
@@ -175,17 +229,15 @@ protected:
 
     //! Code to return at exit
     int             m_exitCode;
-
+    //! Whether application window is active
     bool            m_active;
-    bool            m_activateApp;
-    bool            m_ready;
-
-    bool            m_showStats;
+    //! Whether debug mode is enabled
     bool            m_debugMode;
-    bool            m_setupMode;
 
-    //! Whether joystick is enabled
-    bool            m_joystickEnabled;
+    //! Current configuration of OpenGL display device
+    Gfx::GLDeviceConfig m_deviceConfig;
+    //! Previous configuration of OpenGL display device
+    Gfx::GLDeviceConfig m_lastDeviceConfig;
 
     //! Text set as window title
     std::string     m_windowTitle;
@@ -196,14 +248,17 @@ protected:
     Math::Point     m_systemMousePos;
     long            m_mouseWheel;
 
+    long            m_key[50][2];
+
+    //! Info about current joystick device
+    JoystickDevice  m_joystick;
+    //! Whether joystick is enabled
+    bool            m_joystickEnabled;
     //! Current state of joystick axes; may be updated from another thread
     std::vector<int> m_joyAxeState;
     //! Current state of joystick buttons; may be updated from another thread
     std::vector<bool> m_joyButtonState;
 
-    float           m_time;
-    long            m_key[50][2];
-
     //! Path to directory with data files
     std::string     m_dataPath;
 };
diff --git a/src/common/event.h b/src/common/event.h
index 6ce1a79..0d9aa7c 100644
--- a/src/common/event.h
+++ b/src/common/event.h
@@ -55,6 +55,9 @@ enum EventType
     //! Event sent after releasing a key
     EVENT_KEY_UP            = 9,
 
+    //! Event sent when application window loses/gains focus
+    EVENT_ACTIVE            = 10,
+
     //? EVENT_CHAR              = 10,
     //? EVENT_FOCUS             = 11,
 
@@ -608,7 +611,7 @@ struct JoyAxisEventData
 };
 
 /** \struct JoyButtonEventData
-    \brief Joystick button event structure */
+    \brief Additional data for joystick button event */
 struct JoyButtonEventData
 {
     //! The joystick button index
@@ -620,7 +623,31 @@ struct JoyButtonEventData
         : button(0), state(STATE_PRESSED) {}
 };
 
-// TODO: JoyHatEventData? JoyBallEventData?
+/** \enum ActiveEventFlags
+    \brief Type of focus gained/lost */
+enum ActiveEventFlags
+{
+    //! Application window focus
+    ACTIVE_APP   = 0x01,
+    //! Input focus
+    ACTIVE_INPUT = 0x02,
+    //! Mouse focus
+    ACTIVE_MOUSE = 0x04
+
+};
+
+/** \struct ActiveEventData
+    \brief Additional data for active event */
+struct ActiveEventData
+{
+    //! Flags (bitmask of enum values ActiveEventFlags)
+    unsigned char flags = 0;
+    //! True if the focus was gained; false otherwise
+    bool gain;
+
+    ActiveEventData()
+        : flags(0), gain(false) {}
+};
 
 
 /**
@@ -652,6 +679,8 @@ struct Event
     JoyAxisEventData joyAxis;
     //! Additional data for EVENT_JOY_AXIS
     JoyButtonEventData joyButton;
+    //! Additional data for EVENT_ACTIVE
+    ActiveEventData active;
 
     //? long         param;      // parameter
     //? Math::Point  pos;        // mouse position (0 .. 1)
diff --git a/src/graphics/core/device.h b/src/graphics/core/device.h
index ae612b7..1f6cacf 100644
--- a/src/graphics/core/device.h
+++ b/src/graphics/core/device.h
@@ -25,6 +25,7 @@
 #include "graphics/core/material.h"
 #include "graphics/core/texture.h"
 #include "graphics/core/vertex.h"
+#include "math/intsize.h"
 #include "math/matrix.h"
 
 #include <string>
@@ -43,10 +44,8 @@ namespace Gfx {
 */
 struct DeviceConfig
 {
-    //! Screen width
-    int width;
-    //! Screen height
-    int height;
+    //! Screen size
+    Math::IntSize size;
     //! Bits per pixel
     int bpp;
     //! Full screen
@@ -64,8 +63,7 @@ struct DeviceConfig
     //! Loads the default values
     inline void LoadDefault()
     {
-        width = 800;
-        height = 600;
+        size = Math::IntSize(800, 600);
         bpp = 32;
         fullScreen = false;
         resizeable = false;
diff --git a/src/graphics/core/texture.h b/src/graphics/core/texture.h
index 787c2bf..8d6b082 100644
--- a/src/graphics/core/texture.h
+++ b/src/graphics/core/texture.h
@@ -18,6 +18,9 @@
 
 #pragma once
 
+#include "math/intsize.h"
+
+
 namespace Gfx {
 
 /**
@@ -190,10 +193,8 @@ struct Texture
     bool valid;
     //! ID of the texture in graphics engine
     unsigned int id;
-    //! Width of texture
-    int width;
-    //! Height of texture
-    int height;
+    //! Size of texture
+    Math::IntSize size;
     //! Whether the texture has alpha channel
     bool alpha;
 
@@ -201,7 +202,6 @@ struct Texture
     {
         valid = false;
         id = 0;
-        width = height = 0;
         alpha = false;
     }
 
diff --git a/src/graphics/engine/engine.cpp b/src/graphics/engine/engine.cpp
index 0914f9e..e544ee3 100644
--- a/src/graphics/engine/engine.cpp
+++ b/src/graphics/engine/engine.cpp
@@ -62,9 +62,6 @@ Gfx::CEngine::CEngine(CInstanceManager *iMan, CApplication *app)
     m_sound      = NULL;
     m_terrain    = NULL;
 
-    m_dim.x = 640;
-    m_dim.y = 480;
-    m_lastDim = m_dim;
     m_focus = 0.75f;
     m_baseTime = 0;
     m_lastTime = 0;
@@ -272,6 +269,12 @@ bool Gfx::CEngine::AfterDeviceSetInit()
     return true;
 }
 
+void Gfx::CEngine::ResetAfterDeviceChanged()
+{
+    // TODO
+}
+
+
 Gfx::Texture Gfx::CEngine::CreateTexture(const std::string &texName, const Gfx::TextureCreateParams &params)
 {
     CImage img;
@@ -727,3 +730,14 @@ void Gfx::CEngine::AddStatisticTriangle(int count)
 {
     m_statisticTriangle += count;
 }
+
+void Gfx::CEngine::SetShowStat(bool show)
+{
+    m_showStats = show;
+}
+
+bool Gfx::CEngine::GetShowStat()
+{
+    return m_showStats;
+}
+
diff --git a/src/graphics/engine/engine.h b/src/graphics/engine/engine.h
index 1348cdd..25c5e5d 100644
--- a/src/graphics/engine/engine.h
+++ b/src/graphics/engine/engine.h
@@ -26,6 +26,7 @@
 #include "graphics/core/texture.h"
 #include "graphics/core/vertex.h"
 #include "math/intpoint.h"
+#include "math/intsize.h"
 #include "math/matrix.h"
 #include "math/point.h"
 #include "math/vector.h"
@@ -513,21 +514,33 @@ public:
     CEngine(CInstanceManager *iMan, CApplication *app);
     ~CEngine();
 
+    //! Returns whether the device was initialized
     bool            GetWasInit();
+    //! Returns the last error encountered
     std::string     GetError();
 
+    //! Performs the first initialization, before a device was set
     bool            Create();
+    //! Frees all resources before exit
     void            Destroy();
 
+    //! Sets the device to be used
     void            SetDevice(Gfx::CDevice *device);
+    //! Returns the current device
     Gfx::CDevice*   GetDevice();
 
+    //! Performs initialization after a device was created and set
     bool            AfterDeviceSetInit();
 
+    //! Resets some states and flushes textures after device was changed (e.g. resoulution changed)
+    void            ResetAfterDeviceChanged();
+
     void            SetTerrain(Gfx::CTerrain* terrain);
 
+    //! Processes incoming event
     bool            ProcessEvent(const Event &event);
 
+    //! Renders a single frame
     bool            Render();
 
 
@@ -859,6 +872,9 @@ protected:
     bool            m_wasInit;
     std::string     m_error;
 
+    //! Whether to show stats (FPS, etc)
+    bool            m_showStats;
+
     int             m_blackSrcBlend[2];
     int             m_blackDestBlend[2];
     int             m_whiteSrcBlend[2];
@@ -887,8 +903,9 @@ protected:
     bool            m_render;
     bool            m_movieLock;
 
-    Math::IntPoint  m_dim;
-    Math::IntPoint  m_lastDim;
+    //! Current size of window
+    Math::IntSize   m_size;
+    Math::IntSize   m_lastSize;
 
     std::vector<Gfx::EngineObjLevel1>  m_objectTree;
     std::vector<Gfx::EngineObject>     m_objects;
diff --git a/src/graphics/opengl/gldevice.cpp b/src/graphics/opengl/gldevice.cpp
index bfe7fd7..1fd6a18 100644
--- a/src/graphics/opengl/gldevice.cpp
+++ b/src/graphics/opengl/gldevice.cpp
@@ -61,8 +61,9 @@ void Gfx::GLDeviceConfig::LoadDefault()
 
 
 
-Gfx::CGLDevice::CGLDevice()
+Gfx::CGLDevice::CGLDevice(const Gfx::GLDeviceConfig &config)
 {
+    m_config = config;
     m_wasInit = false;
     m_lighting = false;
     m_texturing = false;
@@ -86,18 +87,24 @@ std::string Gfx::CGLDevice::GetError()
 bool Gfx::CGLDevice::Create()
 {
 #if defined(USE_GLEW)
-    if (glewInit() != GLEW_OK)
-    {
-        m_error = "GLEW initialization failed";
-        return false;
-    }
+    static bool glewInited = false;
 
-    if ( (! GLEW_ARB_multitexture) || (! GLEW_EXT_texture_env_combine) || (! GLEW_EXT_secondary_color) )
+    if (!glewInited)
     {
-        m_error = "GLEW reports required extensions not supported";
-        return false;
-    }
+        glewInited = true;
+
+        if (glewInit() != GLEW_OK)
+        {
+            m_error = "GLEW initialization failed";
+            return false;
+        }
 
+        if ( (! GLEW_ARB_multitexture) || (! GLEW_EXT_texture_env_combine) || (! GLEW_EXT_secondary_color) )
+        {
+            m_error = "GLEW reports required extensions not supported";
+            return false;
+        }
+    }
 #endif
 
     /* NOTE: when not using GLEW, extension testing is not performed, as it is assumed that
@@ -123,6 +130,8 @@ bool Gfx::CGLDevice::Create()
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
+    glViewport(0, 0, m_config.size.w, m_config.size.h);
+
 
     m_lights        = std::vector<Gfx::Light>(GL_MAX_LIGHTS, Gfx::Light());
     m_lightsEnabled = std::vector<bool>      (GL_MAX_LIGHTS, false);
@@ -153,6 +162,17 @@ void Gfx::CGLDevice::Destroy()
     m_wasInit = false;
 }
 
+void Gfx::CGLDevice::ConfigChanged(const Gfx::GLDeviceConfig& newConfig)
+{
+    m_config = newConfig;
+
+    // Reset state
+    m_lighting = false;
+    m_texturing = false;
+    Destroy();
+    Create();
+}
+
 void Gfx::CGLDevice::BeginScene()
 {
     Clear();
@@ -375,8 +395,8 @@ Gfx::Texture Gfx::CGLDevice::CreateTexture(CImage *image, const Gfx::TextureCrea
     }
 
     result.valid = true;
-    result.width = data->surface->w;
-    result.height = data->surface->h;
+    result.size.w = data->surface->w;
+    result.size.h = data->surface->h;
 
     // Use & enable 1st texture stage
     glActiveTexture(GL_TEXTURE0);
diff --git a/src/graphics/opengl/gldevice.h b/src/graphics/opengl/gldevice.h
index 313ea02..1864000 100644
--- a/src/graphics/opengl/gldevice.h
+++ b/src/graphics/opengl/gldevice.h
@@ -70,7 +70,7 @@ struct GLDevicePrivate;
 class CGLDevice : public Gfx::CDevice
 {
 public:
-    CGLDevice();
+    CGLDevice(const Gfx::GLDeviceConfig &config);
     virtual ~CGLDevice();
 
     virtual bool GetWasInit();
@@ -79,6 +79,8 @@ public:
     virtual bool Create();
     virtual void Destroy();
 
+    void ConfigChanged(const Gfx::GLDeviceConfig &newConfig);
+
     virtual void BeginScene();
     virtual void EndScene();
 
@@ -159,6 +161,8 @@ private:
     void UpdateLightPosition(int index);
 
 private:
+    //! Current config
+    Gfx::GLDeviceConfig m_config;
     //! Was initialized?
     bool m_wasInit;
     //! Last encountered error
diff --git a/src/math/intsize.h b/src/math/intsize.h
new file mode 100644
index 0000000..f4b2431
--- /dev/null
+++ b/src/math/intsize.h
@@ -0,0 +1,61 @@
+// * This file is part of the COLOBOT source code
+// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
+// *
+// * This program is free software: you can redistribute it and/or modify
+// * it under the terms of the GNU General Public License as published by
+// * the Free Software Foundation, either version 3 of the License, or
+// * (at your option) any later version.
+// *
+// * This program is distributed in the hope that it will be useful,
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// * GNU General Public License for more details.
+// *
+// * You should have received a copy of the GNU General Public License
+// * along with this program. If not, see    http://www.gnu.org/licenses/.
+
+/** @defgroup MathIntSizeModule math/intsize.h
+     Contains the IntSize struct.
+ */
+
+#pragma once
+
+// Math module namespace
+namespace Math
+{
+
+/* @{ */ // start of group
+
+/** \struct IntSize math/size.h
+    \brief 2D size with integer dimensions */
+struct IntSize
+{
+    //! Width
+    int w;
+    //! Height
+    int h;
+
+    //! Constructs a zero size: (0,0)
+    inline IntSize()
+    {
+        LoadZero();
+    }
+
+    //! Constructs a size from given dimensions: (w,h)
+    inline explicit IntSize(int w, int h)
+    {
+        this->w = w;
+        this->h = h;
+    }
+
+    //! Sets the zero size: (0,0)
+    inline void LoadZero()
+    {
+        w = h = 0;
+    }
+}; // struct Size
+
+
+/* @} */ // end of group
+
+}; // namespace Math
diff --git a/src/math/size.h b/src/math/size.h
new file mode 100644
index 0000000..781b9a4
--- /dev/null
+++ b/src/math/size.h
@@ -0,0 +1,66 @@
+// * This file is part of the COLOBOT source code
+// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
+// *
+// * This program is free software: you can redistribute it and/or modify
+// * it under the terms of the GNU General Public License as published by
+// * the Free Software Foundation, either version 3 of the License, or
+// * (at your option) any later version.
+// *
+// * This program is distributed in the hope that it will be useful,
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// * GNU General Public License for more details.
+// *
+// * You should have received a copy of the GNU General Public License
+// * along with this program. If not, see    http://www.gnu.org/licenses/.
+
+/** @defgroup MathSizeModule math/size.h
+     Contains the Size struct.
+ */
+
+#pragma once
+
+// Math module namespace
+namespace Math
+{
+
+/* @{ */ // start of group
+
+/** \struct Size math/size.h
+    \brief 2D size
+
+    Represents a 2D size (w, h).
+    Is separate from Math::Point to avoid confusion.
+
+ */
+struct Size
+{
+    //! Width
+    float w;
+    //! Height
+    float h;
+
+    //! Constructs a zero size: (0,0)
+    inline Size()
+    {
+        LoadZero();
+    }
+
+    //! Constructs a size from given dimensions: (w,h)
+    inline explicit Size(float w, float h)
+    {
+        this->w = w;
+        this->h = h;
+    }
+
+    //! Sets the zero size: (0,0)
+    inline void LoadZero()
+    {
+        w = h = 0.0f;
+    }
+}; // struct Size
+
+
+/* @} */ // end of group
+
+}; // namespace Math