NRE_GraphicsDriver.hpp

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     #pragma once

     #include <cstdlib>
     #include <iostream>

     #define GLEW_STATIC

     #ifdef GLEW_STATIC
         #define GLEWAPI extern
     #else
         #ifdef GLEW_BUILD
             #define GLEWAPI extern __declspec(dllexport)
         #else
             #define GLEWAPI extern __declspec(dllimport)
         #endif
     #endif

     #include <GL/glew.h>

     #ifdef _WIN32                           // Windows
        #include <Windows.h>
        #include <wingdi.h>
        #include <GL/wglew.h>
     #elif __linux__                         // Linux
        #include <X11/Xlib.h>
        #include <X11/Xatom.h>
        #include <GL/glxew.h>
     #else
        #error "Not Supported Yet or Unknown compiler"
     #endif

     #include <Utility/UnorderedMap/NRE_UnorderedMap.hpp>
     #include <Utility/Singleton/NRE_Singleton.hpp>
     #include <Utility/Id/NRE_Id.hpp>

     namespace NRE {
         namespace Graphics {

            typedef std::size_t Id;

            #ifdef _WIN32                           // Windows
                typedef HWND NativeWindowType;
            #elif __linux__                         // Linux
                typedef Window NativeWindowType;
            #endif

            class GraphicsDriver : public Utility::Singleton<GraphicsDriver> {
                friend Utility::Singleton<GraphicsDriver>;
                private :   // Fields
                    #ifdef __linux__               // Linux
                        Display* display;                                       
                        Atom closeAtom;                                         
                    #endif
                    Utility::UnorderedMap<NativeWindowType, Id> windows;        
                public :    // Methods
                    //## Move Constructor ##//
                        GraphicsDriver(GraphicsDriver && drv) = delete;

                    //## Deconstructor ##//
                        ~GraphicsDriver();

                    //## Getter ##//
                        #ifdef __linux__               // Linux

                            Display* getDisplay();
                            Atom& getCloseAtom();
                        #endif

                        void registerWindow(NativeWindowType window, Id id);
                        void unregisterWindow(NativeWindowType window);
                        Id findId(NativeWindowType window) const;

                    //## Assignment Operator ##//
                        GraphicsDriver& operator =(GraphicsDriver && drv) = delete;

                private :   // Methods
                    //## Constructor ##//
                        GraphicsDriver();

            };
        }
    }

    #include "NRE_GraphicsDriver.tpp"
    #ifdef _WIN32                           // Windows
        #include "../../../OS/Windows/Graphics/Driver/NRE_WindowsGraphicsDriver.tpp"
    #elif __linux__                         // Linux
        #include "../../../OS/Linux/Graphics/Driver/NRE_LinuxGraphicsDriver.tpp"
    #endif