Added SDL GL buffer swap

include/Window.h

@@ -37,6 +37,8 @@ public:
 
     virtual void writeString(WindowString *s) = 0;
 
+    virtual void swapBuffersGL() = 0;
+
     virtual void resizeGL(unsigned int w, unsigned int h);
 };
 

include/WindowSDL.h

@@ -40,6 +40,8 @@ public:
 
     virtual void writeString(WindowString *s);
 
+    virtual void swapBuffersGL();
+
 private:
     bool mInit;
     char *mDriver;

src/WindowSDL.cpp

@@ -139,3 +139,7 @@ void WindowSDL::writeString(WindowString *s) {
 
 }
 
+void WindowSDL::swapBuffersGL() {
+    SDL_GL_SwapWindow(mWindow);
+}
+