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#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include "xwin.h"
void reshape(int x, int y);
void set_window_title(const char *title);
Display *dpy;
Atom wm_prot, wm_del_win;
GLXContext ctx;
Window win;
int redisplay_pending;
int create_xwin(const char *title, int xsz, int ysz)
{
int scr;
Window root;
XVisualInfo *vis;
XSetWindowAttributes xattr;
unsigned int events;
XClassHint class_hint;
int attr[] = {
GLX_RGBA, GLX_DOUBLEBUFFER,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_DEPTH_SIZE, 24,
None
};
wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
scr = DefaultScreen(dpy);
root = RootWindow(dpy, scr);
if(!(vis = glXChooseVisual(dpy, scr, attr))) {
fprintf(stderr, "requested GLX visual is not available\n");
return -1;
}
if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
fprintf(stderr, "failed to create GLX context\n");
XFree(vis);
return -1;
}
xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
if(!(win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
vis->visual, CWColormap | CWBackPixel | CWBorderPixel, &xattr))) {
fprintf(stderr, "failed to create X window\n");
return -1;
}
XFree(vis);
/* set the window event mask */
events = ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask |
ButtonReleaseMask | ButtonPressMask | PointerMotionMask;
XSelectInput(dpy, win, events);
XSetWMProtocols(dpy, win, &wm_del_win, 1);
set_window_title(title);
class_hint.res_name = "libspnav_example";
class_hint.res_class = "libspnav_example";
XSetClassHint(dpy, win, &class_hint);
if(glXMakeCurrent(dpy, win, ctx) == False) {
fprintf(stderr, "glXMakeCurrent failed\n");
glXDestroyContext(dpy, ctx);
XDestroyWindow(dpy, win);
return -1;
}
XMapWindow(dpy, win);
XFlush(dpy);
return 0;
}
void destroy_xwin(void)
{
glXDestroyContext(dpy, ctx);
XDestroyWindow(dpy, win);
glXMakeCurrent(dpy, None, 0);
}
void set_window_title(const char *title)
{
XTextProperty wm_name;
XStringListToTextProperty((char**)&title, 1, &wm_name);
XSetWMName(dpy, win, &wm_name);
XSetWMIconName(dpy, win, &wm_name);
XFree(wm_name.value);
}
int handle_xevent(XEvent *xev)
{
int x, y;
KeySym sym;
switch(xev->type) {
case Expose:
redisplay_pending = 1;
break;
case ClientMessage:
if(xev->xclient.message_type == wm_prot) {
if(xev->xclient.data.l[0] == wm_del_win) {
return 1;
}
}
break;
case KeyPress:
sym = XLookupKeysym((XKeyEvent*)&xev->xkey, 0);
if((sym & 0xff) == 27) {
return 1;
}
break;
case ConfigureNotify:
x = xev->xconfigure.width;
y = xev->xconfigure.height;
reshape(x, y);
break;
default:
break;
}
return 0;
}
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