1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/main.cc	Tue Jul 15 04:46:10 2014 +0300
     1.3 @@ -0,0 +1,287 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <assert.h>
     1.7 +#include <errno.h>
     1.8 +#include <unistd.h>
     1.9 +#include <sys/select.h>
    1.10 +#include <GL/glew.h>
    1.11 +#include <X11/Xlib.h>
    1.12 +#include <GL/glx.h>
    1.13 +
    1.14 +static bool init();
    1.15 +static void cleanup();
    1.16 +static void display();
    1.17 +static void keyb(int key, bool pressed);
    1.18 +static void mouse(int bn, bool pressed, int x, int y);
    1.19 +static void motion(int x, int y);
    1.20 +
    1.21 +static Window create_window(const char *title, int xsz, int ysz);
    1.22 +static void process_events();
    1.23 +static int translate_keysym(KeySym sym);
    1.24 +
    1.25 +static Display *dpy;
    1.26 +static Window win;
    1.27 +static GLXContext ctx;
    1.28 +static Atom xa_wm_prot, xa_wm_del_win;
    1.29 +
    1.30 +static int win_width, win_height;
    1.31 +
    1.32 +static bool redisplay_pending;
    1.33 +static bool win_mapped;
    1.34 +
    1.35 +int main()
    1.36 +{
    1.37 +	if(!init()) {
    1.38 +		fprintf(stderr, "X11/OpenGL initialization failed\n");
    1.39 +		return 1;
    1.40 +	}
    1.41 +	atexit(cleanup);
    1.42 +
    1.43 +	int xfd = ConnectionNumber(dpy);
    1.44 +
    1.45 +	for(;;) {
    1.46 +		fd_set rd;
    1.47 +		FD_ZERO(&rd);
    1.48 +
    1.49 +		FD_SET(xfd, &rd);
    1.50 +
    1.51 +		while(select(xfd + 1, &rd, 0, 0, 0) == -1 && errno == EINTR);
    1.52 +
    1.53 +		if(FD_ISSET(xfd, &rd)) {
    1.54 +			process_events();
    1.55 +		}
    1.56 +
    1.57 +		if(redisplay_pending) {
    1.58 +			display();
    1.59 +			redisplay_pending = false;
    1.60 +		}
    1.61 +	}
    1.62 +	return 0;
    1.63 +}
    1.64 +
    1.65 +static bool init()
    1.66 +{
    1.67 +	if(!(dpy = XOpenDisplay(0))) {
    1.68 +		fprintf(stderr, "failed to connect to the X server!\n");
    1.69 +		return false;
    1.70 +	}
    1.71 +
    1.72 +	if(!(win = create_window("dummy equeue device", 800, 600))) {
    1.73 +		return false;
    1.74 +	}
    1.75 +
    1.76 +	return true;
    1.77 +}
    1.78 +
    1.79 +static void cleanup()
    1.80 +{
    1.81 +	if(!dpy) return;
    1.82 +
    1.83 +	if(win) {
    1.84 +		XDestroyWindow(dpy, win);
    1.85 +	}
    1.86 +	XCloseDisplay(dpy);
    1.87 +}
    1.88 +
    1.89 +static void display()
    1.90 +{
    1.91 +	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    1.92 +
    1.93 +	glMatrixMode(GL_MODELVIEW);
    1.94 +	glLoadIdentity();
    1.95 +
    1.96 +	glXSwapBuffers(dpy, win);
    1.97 +	assert(glGetError() == GL_NO_ERROR);
    1.98 +}
    1.99 +
   1.100 +static void reshape(int x, int y)
   1.101 +{
   1.102 +	glViewport(0, 0, x, y);
   1.103 +
   1.104 +	glMatrixMode(GL_PROJECTION);
   1.105 +	glLoadIdentity();
   1.106 +	gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
   1.107 +}
   1.108 +
   1.109 +static void keyb(int key, bool pressed)
   1.110 +{
   1.111 +	if(pressed) {
   1.112 +		switch(key) {
   1.113 +		case 27:
   1.114 +			exit(0);
   1.115 +		}
   1.116 +	}
   1.117 +}
   1.118 +
   1.119 +static void mouse(int bn, bool pressed, int x, int y)
   1.120 +{
   1.121 +}
   1.122 +
   1.123 +static void motion(int x, int y)
   1.124 +{
   1.125 +}
   1.126 +
   1.127 +static Window create_window(const char *title, int xsz, int ysz)
   1.128 +{
   1.129 +	int scr = DefaultScreen(dpy);
   1.130 +	Window root = RootWindow(dpy, scr);
   1.131 +
   1.132 +	int glxattr[] = {
   1.133 +		GLX_RGBA,
   1.134 +		GLX_RED_SIZE, 8,
   1.135 +		GLX_GREEN_SIZE, 8,
   1.136 +		GLX_BLUE_SIZE, 8,
   1.137 +		GLX_DEPTH_SIZE, 24,
   1.138 +		GLX_DOUBLEBUFFER,
   1.139 +#if defined(GLX_VERSION_1_4) || defined(GLX_ARB_multisample)
   1.140 +		GLX_SAMPLE_BUFFERS_ARB, 1,
   1.141 +		GLX_SAMPLES_ARB, 1,
   1.142 +#endif
   1.143 +		None
   1.144 +	};
   1.145 +
   1.146 +	XVisualInfo *vis = glXChooseVisual(dpy, scr, glxattr);
   1.147 +	if(!vis) {
   1.148 +		fprintf(stderr, "failed to find a suitable visual\n");
   1.149 +		return 0;
   1.150 +	}
   1.151 +
   1.152 +	if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
   1.153 +		fprintf(stderr, "failed to create OpenGL context\n");
   1.154 +		XFree(vis);
   1.155 +		return -1;
   1.156 +	}
   1.157 +
   1.158 +	XSetWindowAttributes xattr;
   1.159 +	xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
   1.160 +	xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
   1.161 +	unsigned int xattr_mask = CWColormap | CWBackPixel | CWBorderPixel;
   1.162 +
   1.163 +	Window win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
   1.164 +			vis->visual, xattr_mask, &xattr);
   1.165 +	if(!win) {
   1.166 +		fprintf(stderr, "failed to create window\n");
   1.167 +		glXDestroyContext(dpy, ctx);
   1.168 +		XFree(vis);
   1.169 +		return -1;
   1.170 +	}
   1.171 +	XFree(vis);
   1.172 +
   1.173 +	unsigned int evmask = StructureNotifyMask | VisibilityChangeMask | ExposureMask |
   1.174 +		KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask |
   1.175 +		ButtonMotionMask | PointerMotionMask;
   1.176 +	XSelectInput(dpy, win, evmask);
   1.177 +
   1.178 +	xa_wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
   1.179 +	xa_wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
   1.180 +	XSetWMProtocols(dpy, win, &xa_wm_del_win, 1);
   1.181 +
   1.182 +	XClassHint hint;
   1.183 +	hint.res_name = hint.res_class = (char*)"equeue_win";
   1.184 +	XSetClassHint(dpy, win, &hint);
   1.185 +
   1.186 +	XTextProperty wm_name;
   1.187 +	XStringListToTextProperty((char**)&title, 1, &wm_name);
   1.188 +	XSetWMName(dpy, win, &wm_name);
   1.189 +	XSetWMIconName(dpy, win, &wm_name);
   1.190 +	XFree(wm_name.value);
   1.191 +
   1.192 +	XMapWindow(dpy, win);
   1.193 +	glXMakeCurrent(dpy, win, ctx);
   1.194 +
   1.195 +	return win;
   1.196 +}
   1.197 +
   1.198 +static void process_events()
   1.199 +{
   1.200 +	XEvent ev;
   1.201 +
   1.202 +	while(XPending(dpy)) {
   1.203 +		XNextEvent(dpy, &ev);
   1.204 +		switch(ev.type) {
   1.205 +		case MapNotify:
   1.206 +			win_mapped = true;
   1.207 +			break;
   1.208 +
   1.209 +		case UnmapNotify:
   1.210 +			win_mapped = false;
   1.211 +			break;
   1.212 +
   1.213 +		case Expose:
   1.214 +			if(win_mapped && ev.xexpose.count == 0) {
   1.215 +				redisplay_pending = 1;
   1.216 +			}
   1.217 +			break;
   1.218 +
   1.219 +		case MotionNotify:
   1.220 +			motion(ev.xmotion.x, ev.xmotion.y);
   1.221 +			break;
   1.222 +
   1.223 +		case ButtonPress:
   1.224 +			mouse(ev.xbutton.button - 1, true, ev.xbutton.x, ev.xbutton.y);
   1.225 +			break;
   1.226 +
   1.227 +		case ButtonRelease:
   1.228 +			mouse(ev.xbutton.button - 1, false, ev.xbutton.x, ev.xbutton.y);
   1.229 +			break;
   1.230 +
   1.231 +		case KeyPress:
   1.232 +			{
   1.233 +				KeySym sym = XLookupKeysym(&ev.xkey, 0);
   1.234 +				keyb(translate_keysym(sym), true);
   1.235 +			}
   1.236 +			break;
   1.237 +
   1.238 +		case KeyRelease:
   1.239 +			{
   1.240 +				KeySym sym = XLookupKeysym(&ev.xkey, 0);
   1.241 +				keyb(translate_keysym(sym), false);
   1.242 +			}
   1.243 +			break;
   1.244 +
   1.245 +		case ConfigureNotify:
   1.246 +			{
   1.247 +				int xsz = ev.xconfigure.width;
   1.248 +				int ysz = ev.xconfigure.height;
   1.249 +
   1.250 +				if(xsz != win_width || ysz != win_height) {
   1.251 +					win_width = xsz;
   1.252 +					win_height = ysz;
   1.253 +					reshape(xsz, ysz);
   1.254 +				}
   1.255 +			}
   1.256 +			break;
   1.257 +
   1.258 +		case ClientMessage:
   1.259 +			if(ev.xclient.message_type == xa_wm_prot) {
   1.260 +				if((Atom)ev.xclient.data.l[0] == xa_wm_del_win) {
   1.261 +					exit(0);
   1.262 +				}
   1.263 +			}
   1.264 +			break;
   1.265 +
   1.266 +		default:
   1.267 +			break;
   1.268 +		}
   1.269 +
   1.270 +	}
   1.271 +}
   1.272 +
   1.273 +static int translate_keysym(KeySym sym)
   1.274 +{
   1.275 +	switch(sym) {
   1.276 +	case XK_BackSpace:
   1.277 +		return '\b';
   1.278 +	case XK_Tab:
   1.279 +		return '\t';
   1.280 +	case XK_Linefeed:
   1.281 +		return '\r';
   1.282 +	case XK_Return:
   1.283 +		return '\n';
   1.284 +	case XK_Escape:
   1.285 +		return 27;
   1.286 +	default:
   1.287 +		break;
   1.288 +	}
   1.289 +	return (int)sym;
   1.290 +}