KlassischeKeplerKriege/game/opengl.hpp

#pragma once
#include <stdexcept>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <epoxy/gl.h>
#include <epoxy/glx.h>

namespace endofthejedi {

class GLWindow {
	private:
    //X-related stuff
		Display* m_display;
		Window m_rootwnd;
		GLint m_attributes[23] =
    {
      GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
      GLX_RENDER_TYPE, GLX_RGBA_BIT,
      GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
      GLX_RED_SIZE, 8,
      GLX_GREEN_SIZE, 8,
      GLX_BLUE_SIZE, 8,
      GLX_ALPHA_SIZE, 8,
      GLX_DEPTH_SIZE, 24,
      GLX_STENCIL_SIZE, 8,
      GLX_DOUBLEBUFFER, True,
      None
    };

		XVisualInfo* m_visualinfo;
		Colormap m_colormap;
		XSetWindowAttributes m_swa;
		Window m_window;
		GLXContext m_glcontext;
		XWindowAttributes m_gwa;
    Atom m_atomWmDeleteWindow;
    //End of X related stuff

    unsigned int m_width;
    unsigned int m_height;

    //mainloop condition
    bool m_running = false;

    double m_fps;
    //if maxfps = 0 there's no fps limit
    double m_maxfps;

    void handleevents();

	protected:
    //ancestors shall override these methods
    virtual void init();
    //called by mainloop periodically
    //time shall be used for timebased movement
    virtual void render(double time);
    //called by handle on window resize
    virtual void resize();
    //the ancestor should call the handle function in this class, too,
    //as it handles the close calls & resizing
    virtual void handle(XEvent event);

 public:
    //initializes the X Window & creates an OpenGL context
		GLWindow(unsigned int width, unsigned int height);
		~GLWindow();

    //mainloop does event handling & calls render/swap
    void loop();
    void swap();
    //stops the mainloop by setting m_running false
    void stop();

    //getters
    unsigned int getheight() const {
      return m_height;
    }

    unsigned int getwidth() const {
      return m_width;
    }

    double get_maxfps() const {
      return m_maxfps;
    }

    double get_fps() const {
      return m_fps;
    }

    bool get_running() const {
      return m_running;
    }

    //setters
    void set_maxfps(const double maxfps) {
      m_maxfps = maxfps;
    }
};

}