//You can compile with GCC from terminal using: //cc wtf2.c -o wtf2 -lX11 -lGL -lGLU //This is written in C. #include//for UNIX terminal support #include//some basic system functions #include//for X window system #include//likewise #include//for OpenGL #include//likewise #include//likewise int main(int argc, char** argv){//main function, argc is the number of command-line arguments (it is always 1> than the actual number of arguments because the program's name itself is considered as 0th argument, argv is the array of strings: each element is one argument: argv[0] is the program name, argv[1] is the first argument, argv[2] is the second argument..., argv[argc] is a "(null)" string //some excessive X11/OpenGL bloat used to initialize the window Display *dpy;//pointer to X display Window root;//this will be our root window GLint att[]={GLX_RGBA,GLX_DEPTH_SIZE,24,GLX_DOUBLEBUFFER,None};//these are some attributes that we need XVisualInfo *vi;//speaks for itself Colormap cmap;//description of our set of colors XSetWindowAttributes swa;//window attributes will be placed here Window win;//our window (will be placed inside the root window) GLXContext glc;//speaks for itself XWindowAttributes gwa;//speaks for itself XEvent xev;//X events are signals sent to a program when the user moves/clicks the mouse, presses a key on the keyboard, resized the window... dpy = XOpenDisplay(NULL);//lets try to open a connection to the X server (that's the part of the system that allows us to open windows) if(!dpy){//if we failed there's nothing we can do fprintf(stderr,"fatal error: cannot open X display\n"); return 0;//end the program }//if we didn't fail, the program moves on root = DefaultRootWindow(dpy);//ask X where should we place our window (=get root window access; root window is usually the screen btw) vi = glXChooseVisual(dpy, 0, att);//get if necessary visual properties are available if(vi == NULL) {//if we can't draw proper OpenGL that's a problem fprintf(stderr,"fatal error: no appropriate visual found (OpenGL trouble)\n"); XCloseDisplay(dpy);//close display access return 0;//end the program }//else, if we can draw OpenGL then lets get things started cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);//we need some colors swa.colormap = cmap; win = XCreateWindow(dpy, root, 0, 0, 320, 240, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);//creates the window XMapWindow(dpy, win);//puts the window on the screen glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);//get OpenGL started glXMakeCurrent(dpy, win, glc);//attach glx context to window glDisable(GL_DEPTH_TEST);//we'll draw 2D only so we don't need depth testing //end of some excessive X11/OpenGL bloat //window status typedef struct{ unsigned int width, height; }Windowstatus;Windowstatus winstat; winstat.width=640;winstat.height=480; //input status (keyboard & mouse) typedef struct{ unsigned char _esc, _f1, _f2, _f3, _f4, _f5, _f6, _f7, _f8, _f9, _f10, _f11, _f12, _f13, _f14, _f15, _f16, _printscreen, _srolllock, _pause, _tilde, _1, _2, _3, _4, _5, _6, _7, _8, _9, _0, _minus, _plus, _backspace, _tab, _enter, _a, _b, _c, _d, _e, _f, _g, _h, _i, _j, _k, _l, _m, _n, _o, _p, _q, _r, _s, _t, _u, _v, _w, _x, _y, _z, _lessthan, _comma, _period, _questionmark, _e1, _e2, _e3, _e4, _e5, _e6, _e7, _e8, _e9,//extra keys like []{}:;'"|\äëïöüšśđčćžźå... or play, pause, mail, calculator, office, web... keys _e10, _e11, _e12, _e13, _e14, _e15, _e16, _e17, _e18, _e19, _e20, _e21, _e22, _e23, _e24, _e25, _e26, _e27, _e28, _e29, _e30, _e31, _e32,//I hope that's enough _capslock, _lshift, _rshift, _lctrl, _rctrl, _lalt, _ralt, _lsuper, _rsuper, _menu, _int, _del, _home, _end, _pageup, _pagedown, _uparrow, _leftarrow, _downarrow, _rightarrow, _numlock, _kpslash, _kpasterisk, _kpminus, _kpplus, _kpenter, kpdel, _kp0, _kp1, _kp2, _kp3, _kp4, _kp5, _kp6, _kp7, _kp8, _kp9, //I hope I didn't forget anything important //mouse buttons, including wheel ticks _m1, _m2, _m3, _m4, _m5, _m6, _m7, _m8, _m9, _m10,//I hope 16 buttons is enough to cover virtually any mouse _m11, _m12, _m13, _m14, _m15, _m16; long _mx, _my;//mouse position, usually positive (between 0 and window's width/height), but a signed variable is used just in case of some buggy X implementation, to prevent needless crashing }Inputarray;Inputarray inarr={0}; void Xinputevents2Inputarray(Inputarray* inarr, XEvent *xev){ unsigned char a=0;//0 for Key/ButtonRelease, 1 for Key/ButtonPress if(xev->type==KeyPress || xev->type==ButtonPress){ a=1; } if(xev->type==KeyPress || xev->type==KeyRelease){//first because a player that plays without a mouse is more likely than a player that plays without a keyboard (or, at the very least, _I_ prefer using keyboard over mouse) switch(xev->xkey.keycode){ case XK_Escape:inarr->_esc=a; default:break; } return; } //no need for _else_ if(){} because of return; if(xev->type==MotionNotify){//second because if we have a mouse, it is more often moved than clicked, even if unintentionally inarr->_mx=xev->xmotion.x; inarr->_my=xev->xmotion.y; return; } if(xev->type==ButtonPress || xev->type==ButtonRelease){//last because see previous case inarr->_mx=xev->xbutton.x;//because MotionNotify events seem buggy (on my computer), i.e. they ofen do not appear inarr->_my=xev->xbutton.y; switch(xev->xbutton.button){ case 1:inarr->_m1=a;break; case 2:inarr->_m2=a;break; case 3:inarr->_m3=a;break; case 4:inarr->_m4=a;break; case 5:inarr->_m5=a;break; case 6:inarr->_m6=a;break; case 7:inarr->_m7=a;break; case 8:inarr->_m8=a;break; case 9:inarr->_m9=a;break; case 10:inarr->_m10=a;break; case 11:inarr->_m11=a;break; case 12:inarr->_m12=a;break; case 13:inarr->_m13=a;break; case 14:inarr->_m14=a;break; case 15:inarr->_m15=a;break; case 16:inarr->_m16=a;break; default:break; } return; } //if you intent to implement joystick/whatever support, place it into another if(){} here } //set screen size XResizeWindow(dpy,win,winstat.width,winstat.height); //some OpenGL bloat glViewport(0, 0, winstat.width, winstat.height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0,winstat.height,winstat.width,0,0,1); glMatrixMode(GL_MODELVIEW); //end of some OpenGL bloat*/ unsigned char running=1; int i,j; while(running){//main loop XFlush(dpy); //check X events (user input) while(XPending(dpy)){ XNextEvent(dpy,&xev); switch (xev.type){ case KeyPress:case KeyRelease: case MotionNotify:case ButtonPress:case ButtonRelease: Xinputevents2Inputarray(&inarr,&xev); break; case Expose: break; default: fprintf(stderr,"Unhandled X event type: %d.\n",xev.type); } } //draw glBegin(GL_POINTS); for(i=1;i<1000;++i){ glColor4f(0.7,0.3,0.4,0.5);//rgba glVertex2f(i/100,i%100); } glEnd(); glXSwapBuffers(dpy, win);printf(".\n");system("sleep 1"); //j=j>=200?0:j+1; } //some more X11/OpenGL bloat glXMakeCurrent(dpy, None, NULL); glXDestroyContext(dpy, glc); XDestroyWindow(dpy, win); XCloseDisplay(dpy); //end of some more X11/OpenGL bloat return 0; }