void
processEvents(void) {
while (XPending(x_dpy)) {
XEvent ev;
XNextEvent(x_dpy, &ev);
switch (ev.type) {
case ButtonPress:
onTouchBegin((float)ev.xbutton.x, (float)ev.xbutton.y);
break;
case ButtonRelease:
onTouchEnd((float)ev.xbutton.x, (float)ev.xbutton.y);
break;
case MotionNotify:
onTouchMove((float)ev.xmotion.x, (float)ev.xmotion.y);
break;
case ConfigureNotify:
onResize(ev.xconfigure.width, ev.xconfigure.height);
break;
case ClientMessage:
if (wm_delete_window != None && (Atom)ev.xclient.data.l[0] == wm_delete_window) {
onStop();
return;
}
break;
}
}
}
void
runApp(void) {
Display *x_dpy = XOpenDisplay(NULL);
if (!x_dpy) {
fprintf(stderr, "XOpenDisplay failed\n");
exit(1);
}
EGLDisplay e_dpy = eglGetDisplay(x_dpy);
if (!e_dpy) {
fprintf(stderr, "eglGetDisplay failed\n");
exit(1);
}
EGLint e_major, e_minor;
if (!eglInitialize(e_dpy, &e_major, &e_minor)) {
fprintf(stderr, "eglInitialize failed\n");
exit(1);
}
eglBindAPI(EGL_OPENGL_ES_API);
EGLContext e_ctx;
EGLSurface e_surf;
Window win = new_window(x_dpy, e_dpy, 400, 400, &e_ctx, &e_surf);
XMapWindow(x_dpy, win);
if (!eglMakeCurrent(e_dpy, e_surf, e_surf, e_ctx)) {
fprintf(stderr, "eglMakeCurrent failed\n");
exit(1);
}
while (1) {
XEvent ev;
XNextEvent(x_dpy, &ev);
switch (ev.type) {
case ButtonPress:
onTouchStart((float)ev.xbutton.x, (float)ev.xbutton.y);
break;
case ButtonRelease:
onTouchEnd((float)ev.xbutton.x, (float)ev.xbutton.y);
break;
case MotionNotify:
onTouchMove((float)ev.xmotion.x, (float)ev.xmotion.y);
break;
case Expose:
onDraw();
eglSwapBuffers(e_dpy, e_surf);
// TODO(nigeltao): subscribe to vblank events instead of forcing another
// expose event to keep the event loop ticking over.
// TODO(nigeltao): no longer #include <string.h> when we don't use memset.
XExposeEvent fakeEvent;
memset(&fakeEvent, 0, sizeof(XExposeEvent));
fakeEvent.type = Expose;
fakeEvent.window = win;
XSendEvent(x_dpy, win, 0, 0, (XEvent*)&fakeEvent);
XFlush(x_dpy);
break;
case ConfigureNotify:
onResize(ev.xconfigure.width, ev.xconfigure.height);
glViewport(0, 0, (GLint)ev.xconfigure.width, (GLint)ev.xconfigure.height);
break;
}
}
}