<div dir="ltr">Hi!<div style>looks like it doesn't work. I've added XInitThreads() and it still crashing. Also added XLockDisplay and XUnlockDisplay with the same result.</div><div style>Any idea?</div><div style>Thanks!</div> <div style> int main (int argc, char *argv[]) { if(!XInitThreads()) return 0; gdk_threads_init(); gdk_threads_enter(); gtk_init(&argc, &argv); GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL); g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL); gtk_window_set_title(GTK_WINDOW(window), "cairo_gl"); gtk_window_set_default_size(GTK_WINDOW(window), 400, 300); gtk_widget_set_app_paintable(window, TRUE); gtk_widget_set_double_buffered(window, FALSE); gtk_widget_show_all(window); window_surface=create_source_surface_for_widget(window); (void)g_timeout_add(33, (GSourceFunc)timer_exe, window); //do_draw(NULL); gtk_main(); gdk_threads_leave(); return 0; }<div> </div></div><div style> </div><div style>void *do_draw(void *ptr) { rendering=TRUE; cairo_t *cr = cairo_create(window_surface); if(cairo_status(cr)) return NULL; Display *dpy =cairo_glx_device_get_display((cairo_surface_get_device(window_surface))); XLockDisplay(dpy); //do some time-consuming drawing here ... // ...<div> // ...</div><div> </div> cairo_destroy(cr); cairo_gl_surface_swapbuffers (window_surface); XUnlockDisplay(dpy); rendering=FALSE; return NULL; }<div> </div></div><div style> </div></div><div class="gmail_extra"> <div class="gmail_quote">2013/1/11 Carlos López González <<a href="mailto:genetita@gmail.com" target="_blank">genetita@gmail.com</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thanks Henry, I'll give it a try. </div><div class="gmail_extra"> <div class="gmail_quote"> 2013/1/11 Henry (Yu) Song - SISA <<a href="mailto:hsong@sisa.samsung.com" target="_blank">hsong@sisa.samsung.com</a>><div><div class="h5"> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, Please add XInitThreads() in your main. For multithreaded application using gl_surface is not a good idea for the moment unless you have intel/radeon/nouveau drivers, otherwise, you will have very sloooooow performance. We will resolve that soon in cairo for gl backend, I hope. Henry ________________________________________ From: cairo-bounces+henry.song=<a href="mailto:samsung.com@cairographics.org" target="_blank">samsung.com@cairographics.org</a> [cairo-bounces+henry.song=<a href="mailto:samsung.com@cairographics.org" target="_blank">samsung.com@cairographics.org</a>] on behalf of Carlos López González [<a href="mailto:genetita@gmail.com" target="_blank">genetita@gmail.com</a>] Sent: Thursday, January 10, 2013 11:26 AM To: <a href="mailto:cairo@cairographics.org" target="_blank">cairo@cairographics.org</a> Subject: [cairo] Threaded animation with cairo_gl backend over a GtkWidget <div><div> Hi! I've made a modified version [1] of the example of threaded animation using Cairo [2]. First I've used the method to create a cairo_gl_surface from the test/gl_source_surface.c file adapted to create the surface for a given widget instead for a defined size. Also, for simplicity, I removed all the handled signals except the destroy one. To handle the drawing for the window widget using the cairo_gl backend I use the create_gl_surface_for_window function passing it the proper widget information. So far, for a single drawing execution it works as expected: 1) In main() create the window_surface 2) The do_draw function creates a context based on window_surface 3) Once done the drawings with Cairo then the buffers are swapped and the content is shown on screen. Notice that the window_surface is never destroyed explicitly because it is owned by the window widget and so it will be destroyed when the window is destroyed by gtk. The problem comes when I enable the multithreading support by uncommenting the line: //(void)g_timeout_add(33, (GSourceFunc)timer_exe, window); It triggers the timer_exe function 33 times per second and then it creates threads that will call do_draw each time. Once enabled it crashes at the first painting function from Cairo. I believe that the problem is that the window_surface belongs to the window widget when I created it and then I can't modify it outside the main gtk thread. How can I solve this? If I enclose the Cairo painting operations inside a gdk_threads_enter and gdk_threads_leave I would add a lot of time consuming operations to the main gtk thread, which is precisely what I want to avoid using multithreading. Any help? I would like to know at last, if my assumptions of the window_surface ownership are true or not. Thanks! [1] <a href="https://github.com/genete/my-test-area/blob/direct_draw/src/cairo_sample.c" target="_blank">https://github.com/genete/my-test-area/blob/direct_draw/src/cairo_sample.c</a> [2] <a href="http://cairographics.org/threaded_animation_with_cairo/" target="_blank">http://cairographics.org/threaded_animation_with_cairo/</a> -- Carlos <a href="http://synfig.org" target="_blank">http://synfig.org</a> </div></div></blockquote></div></div></div> -- Carlos <a href="http://synfig.org" target="_blank">http://synfig.org</a> </div> </blockquote></div> <div> </div>-- Carlos <a href="http://synfig.org" target="_blank">http://synfig.org</a> </div>