Platform: make virtual functions private, rendering protected, other public.

* The default (empty) implementation of virtuals shouldn't be called,
   thus this effectively protects the user from doing it.
 * Only the application itself knows best when and how to call
   rendering-related functions such as swapBuffers() and redraw(), thus
   they are protected.
 * Functions for setting up fullscreen or hiding the mouse may be called
   from user code outside the application, thus they are kept public.

src/Platform/AbstractXApplication.h

@@ -111,13 +111,7 @@ class AbstractXApplication {
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);
 
-        /** @{ @name Drawing functions */
-
-        /** @copydoc Sdl2Application::viewportEvent() */
-        virtual void viewportEvent(const Vector2i& size) = 0;
-
-        /** @copydoc Sdl2Application::drawEvent() */
-        virtual void drawEvent() = 0;
+        /** @{ @name Screen handling */
 
         /** @copydoc Sdl2Application::swapBuffers() */
         void swapBuffers();
@@ -125,6 +119,17 @@ class AbstractXApplication {
         /** @copydoc Sdl2Application::redraw() */
         void redraw() { flags |= Flag::Redraw; }
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
+    protected:
+    #else
+    private:
+    #endif
+        /** @copydoc Sdl2Application::viewportEvent() */
+        virtual void viewportEvent(const Vector2i& size) = 0;
+
+        /** @copydoc Sdl2Application::drawEvent() */
+        virtual void drawEvent() = 0;
+
         /*@}*/
 
         /** @{ @name Keyboard handling */

src/Platform/GlutApplication.h

@@ -137,13 +137,7 @@ class GlutApplication {
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);
 
-        /** @{ @name Drawing functions */
-
-        /** @copydoc Sdl2Application::viewportEvent() */
-        virtual void viewportEvent(const Vector2i& size) = 0;
-
-        /** @copydoc Sdl2Application::drawEvent() */
-        virtual void drawEvent() = 0;
+        /** @{ @name Screen handling */
 
         /** @copydoc Sdl2Application::swapBuffers() */
         void swapBuffers() { glutSwapBuffers(); }
@@ -151,6 +145,17 @@ class GlutApplication {
         /** @copydoc Sdl2Application::redraw() */
         void redraw() { glutPostRedisplay(); }
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
+    protected:
+    #else
+    private:
+    #endif
+        /** @copydoc Sdl2Application::viewportEvent() */
+        virtual void viewportEvent(const Vector2i& size) = 0;
+
+        /** @copydoc Sdl2Application::drawEvent() */
+        virtual void drawEvent() = 0;
+
         /*@}*/
 
         /** @{ @name Keyboard handling */
@@ -201,7 +206,11 @@ class GlutApplication {
             glutWarpPointer(position.x(), position.y());
         }
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
     protected:
+    #else
+    private:
+    #endif
         /** @copydoc Sdl2Application::mousePressEvent() */
         virtual void mousePressEvent(MouseEvent& event);
 

src/Platform/NaClApplication.h

@@ -172,19 +172,6 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
         /** @brief Moving is not allowed */
         NaClApplication& operator=(NaClApplication&&) = delete;
 
-        /** @brief Whether the application runs fullscreen */
-        bool isFullscreen();
-
-        /**
-         * @brief Set fullscreen
-         * @return `False` if switch to opposite mode is in progress or if the
-         *      switch is not possible, `true` otherwise.
-         *
-         * The switch is done asynchronously, during the switch no event
-         * processing is done.
-         */
-        bool setFullscreen(bool enabled);
-
     protected:
         /* Nobody will need to have (and delete) NaClApplication*, thus this is
            faster than public pure virtual destructor */
@@ -202,20 +189,40 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);
 
-        /** @{ @name Drawing functions */
+        /** @{ @name Screen handling */
 
-        /** @copydoc Sdl2Application::viewportEvent() */
-        virtual void viewportEvent(const Vector2i& size) = 0;
+    public:
+        /** @brief Whether the application runs fullscreen */
+        bool isFullscreen();
 
-        /** @copydoc Sdl2Application::drawEvent() */
-        virtual void drawEvent() = 0;
+        /**
+         * @brief Set fullscreen
+         * @return `False` if switch to opposite mode is in progress or if the
+         *      switch is not possible, `true` otherwise.
+         *
+         * The switch is done asynchronously, during the switch no event
+         * processing is done.
+         */
+        bool setFullscreen(bool enabled);
 
+    protected:
         /** @copydoc Sdl2Application::swapBuffers() */
         void swapBuffers();
 
         /** @copydoc Sdl2Application::redraw() */
         void redraw() { flags |= Flag::Redraw; }
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
+    protected:
+    #else
+    private:
+    #endif
+        /** @copydoc Sdl2Application::viewportEvent() */
+        virtual void viewportEvent(const Vector2i& size) = 0;
+
+        /** @copydoc Sdl2Application::drawEvent() */
+        virtual void drawEvent() = 0;
+
         /*@}*/
 
         /** @{ @name Keyboard handling */
@@ -255,7 +262,11 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
          */
         void setMouseLocked(bool enabled);
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
     protected:
+    #else
+    private:
+    #endif
         /**
          * @brief Mouse press event
          *

src/Platform/ScreenedApplication.h

@@ -161,6 +161,11 @@ template<class Application> class BasicScreenedApplication: public Application,
            this is faster than public pure virtual destructor */
         ~BasicScreenedApplication();
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
+    protected:
+    #else
+    private:
+    #endif
         /**
          * @brief Global viewport event
          *

src/Platform/Sdl2Application.h

@@ -210,8 +210,28 @@ class Sdl2Application {
          */
         bool tryCreateContext(const Configuration& configuration);
 
-        /** @{ @name Drawing functions */
+        /** @{ @name Screen handling */
 
+        /**
+         * @brief Swap buffers
+         *
+         * Paints currently rendered framebuffer on screen.
+         */
+        void swapBuffers();
+
+        /**
+         * @brief Redraw immediately
+         *
+         * Marks the window for redrawing, resulting in call to @ref drawEvent()
+         * in the next iteration.
+         */
+        void redraw() { flags |= Flag::Redraw; }
+
+    #ifdef DOXYGEN_GENERATING_OUTPUT
+    protected:
+    #else
+    private:
+    #endif
         /**
          * @brief Viewport event
          *
@@ -236,21 +256,6 @@ class Sdl2Application {
          */
         virtual void drawEvent() = 0;
 
-        /**
-         * @brief Swap buffers
-         *
-         * Paints currently rendered framebuffer on screen.
-         */
-        void swapBuffers();
-
-        /**
-         * @brief Redraw immediately
-         *
-         * Marks the window for redrawing, resulting in call to @ref drawEvent()
-         * in the next iteration.
-         */
-        void redraw() { flags |= Flag::Redraw; }
-
         /*@}*/
 
         /** @{ @name Keyboard handling */
@@ -281,12 +286,16 @@ class Sdl2Application {
          * @brief Enable or disable mouse locking
          *
          * When mouse is locked, the cursor is hidden and only
-         * MouseMoveEvent::relativePosition() is changing, absolute position
-         * stays the same.
+         * @ref MouseMoveEvent::relativePosition() is changing, absolute
+         * position stays the same.
          */
         void setMouseLocked(bool enabled);
 
+    #ifdef DOXYGEN_GENERATING_OUTPUT
     protected:
+    #else
+    private:
+    #endif
         /**
          * @brief Mouse press event
          *