opengl windows bugged placement on compositing

[Roland Plüss]

On 01/08/2014 04:50 AM, Thomas Lübking wrote:
> On Mittwoch, 8. Januar 2014 01:14:20 CEST, Roland Plüss wrote:
>
>> You have a window with an OpenGL context for 3D rendering.
>> You create the window with XCreateWindow and an OpenGL infused visual
>> (glXChooseVisual).
>> After creating it you reparent the window into your application
>> (XReparentWindow).
>
> Can you show the actual code?
Unfortunately not. But maybe this screenshot might help to better
explain the problem: http://rptd.ch/misc/debug/composite_gl_problem.jpg
. the red rectangle is the location of the window as reported by
xwininfo. OpenGL though renders quite somewhere else in a broken way. In
general I did really nothing more than this:

====== C++ ==========
int attrList[] = {
        GLX_RGBA,
        GLX_RED_SIZE, 4,
        GLX_GREEN_SIZE, 4,
        GLX_BLUE_SIZE, 4,
        GLX_ALPHA_SIZE, 1,
        GLX_DEPTH_SIZE, 16,
        GLX_STENCIL_SIZE, 16,
        GLX_DOUBLEBUFFER,
        None };
pVisInfo = glXChooseVisual( display, screen, attrList );
pContext = glXCreateNewContext( display, pBestFBConfig, GLX_RGBA_TYPE,
NULL, True );

/* debug output
II [OpenGL] Visual Infos:
II [OpenGL]   Red Bit Count:      8
II [OpenGL]   Green Bit Count:    8
II [OpenGL]   Blue Bit Count:     8
II [OpenGL]   Alpha Bit Count:    8
II [OpenGL]   Depth Bit Count:    24
II [OpenGL]   Stencil Bit Count:  8
II [OpenGL]   Accumulation Buffer Red Bit Count:    0
II [OpenGL]   Accumulation Buffer Green Bit Count:  0
II [OpenGL]   Accumulation Buffer Blue Bit Count:   0
II [OpenGL]   Accumulation Buffer Alpha Bit Count:  0
II [OpenGL] glXChooseFBConfig:
II [OpenGL]   Red Bit Count:      8
II [OpenGL]   Green Bit Count:    8
II [OpenGL]   Blue Bit Count:     8
II [OpenGL]   Alpha Bit Count:    8
II [OpenGL]   Depth Bit Count:    24
II [OpenGL]   Stencil Bit Count:  8
*/

colMap = XCreateColormap( display, rootWindow, pVisInfo->visual,
AllocNone );

swa.colormap = colMap;
swa.border_pixel = 0;
swa.event_mask = BASIC_EVENT_MASK; //0; //pOSUnix->GetEventMask();
swa.do_not_propagate_mask = NOT_PROPAGATE_MASK; //0;
swa.override_redirect = False;
swa.save_under = False;
swa.cursor = 0;
swa.bit_gravity = ForgetGravity;
swa.win_gravity = NorthWestGravity;
pWindow = XCreateWindow( display, parentWindow, 0, 0, width, height, 0,
pVisInfo->depth, InputOutput, pVisInfo->visual, WSA_MASK, &swa );
====== END ==========

The window is create right after the plug window is created with
whatever toolkit I don't know (the NPAPI docs claim Xt or Gtk but I'm
not sure which one is true). I don't think an event loop run manages to
be run in between the too but to my understanding of X this should not
be the problem to begin with.

> Are you using a toolkit?
FOX-ToolKit and NPAPI. With FOX I need resize spaming to get it working
the first time the window is shown. With NPAPI I couldn't get it
working. Docs claim Xt or Gtk.
>
>
>> It seems X11 with compositing in particular reacts very badly to
>> reparenting windows after they have been created.
>
> Check the depth of each window before reparenting them.
> Do they differ (32bit/24bit)?
Both windows are 24-bit. Here the xwininfo of the two (top plug window,
below opengl window):

xwininfo: Window id: 0x5600001 (has no name)
  Absolute upper-left X:  8
  Absolute upper-left Y:  112
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1024
  Height: 786
  Depth: 24
  Visual: 0x23
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +8+112  -648+112  -648-152  +8-152
  -geometry 1024x786+0+0

xwininfo: Window id: 0x5600005 ""
  Absolute upper-left X:  8
  Absolute upper-left Y:  112
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1024
  Height: 786
  Depth: 24
  Visual: 0x27
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x5600004 (not installed)
  Bit Gravity State: ForgetGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +8+112  -648+112  -648-152  +8-152
  -geometry 1024x786+0+0

>
> Cheers,
> Thomas
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-- 
Mit freundlichen Grüssen
Plüss Roland

Leader und Head Programmer
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- Game Engine: Drag[en]gine ( http://www.indiedb.com/engines/dragengine
, http://dragengine.rptd.ch/wiki )
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- Sowie verschiedene Blender Export-Skripts und Game-Tools

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