linux - Attach GLX contexts with different visuals to the same X Window subsequently -


i'm trying create glx context, attach x window, detach , destroy again, create glx context different visual , attach same window.

#include <gl/glx.h> #include <x11/xlib.h> #include <stdlib.h> #include <stdio.h>  // descriptions visuals try - if both equal, example works static int attr_sets[][3] = {         { glx_rgba, glx_doublebuffer, none },         { glx_rgba, none } };  display *dpy; xvisualinfo *vi; glxcontext cxt; window wnd; size_t i;  void fail(const char *m) { fprintf(stderr, "fail: %s #%lu\n", m, i+1); abort(); }  int main(void) {     dpy = xopendisplay(null);     wnd = xcreatesimplewindow(dpy, rootwindow(dpy, 0), 0, 0, 1, 1, 1, 0, 0);     (i = 0; < 2; ++i) {         if (!(vi = glxchoosevisual(dpy, 0, attr_sets[1]))) fail("choose");         if (!(cxt = glxcreatecontext(dpy, vi, none, true))) fail("create");         xfree(vi);         if (!glxmakecurrent(dpy, wnd, cxt)) fail("attach");         if (!glxmakecurrent(dpy, wnd, 0)) fail("detach");         glxdestroycontext(dpy, cxt);     }     xdestroywindow(dpy, wnd);     xclosedisplay(dpy);     return 0; }

this example works on mesa 10.5.2 intel graphics fails on amd fglrx 12.104 when second context attached (fail: attach #2).

what reason error? forbidden specification or driver error?

if @ definition of xcreatesimplewindow you'll see, it's wrapper around xcreatewindow. xcreatewindow in turn use visual of it's parent.

now x11 visuals half story. when attach opengl context drawable first time, visual (and more advanced features fbconfig) of drawable may become refined, later on opengl contexts compatible configurations can attached.

in short once drawables visual/fbconfig has been pinned down, opengl contexts compatible can attached. see error's defined glxmakecurrent, notably

badmatch generated if drawable not created same x screen , visual ctx. generated if drawable none , ctx not null.

normally when using glx you'd use glxcreatewindow create opengl exclusive subwindow in main window, visual/fbconfig can set without affecting main window.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

Rendering JButton to get the JCheckBox behavior in a JTable by using images does not update my table -

i rendering jbutton image on simulate jcheckbox behavior. why don't let jtable render jcheckbox? because need bigger checkboxes , there's no way can resize them (as far know). so, have own table cell renderer , editor. both renders jbutton , checkbox images on them. trying change image checked image unchecked image (or vice versa) , update cell value (boolean true or false). however, reason, getcelleditorvalue() not update table. so, release mouse, value goes original one. any appreciated! lot! public class tableexample extends jframe { jscrollpane pane; jpanel panel; jtable table; object[][] data; mytablemodel tm; renderer buttoncolumn; public tableexample(object[][] data) throws ioexception { string[] columns = {"column#1", "column#2", "column#3", "column#4", "column#5", "column#6"}; this.data = data; this.setpreferredsize(new dimension(700, 500));
Read more