notepad crashes in VNC @ 16bpp

[Francois Gouget]

So if I start a VNC server with the following command:

   vncserver :1 -depth 16 -geometry 1024x768

Then notepad crashes on startup while initializing OpenGL. More 
precisely the crash happens in X11DRV_WineGL_InitOpenglInfo() on line 
304 of winex11.drv/opengl.c. The reason for the crash is an OpenGL/X11 
assertion:

glxcmds.c:343: CreateContext: Assertion "mode != ((void *)0)" failed


This seems like a VNC/OpenGL/X11 bug because Wine works fine if VNC is 
started in 15bpp or 24bpp. Still, the problem is that as this is part of 
the winex11 initialization it impacts all applications (including the 
DIB conformance tests).

Does anyone see a way to avoid the crash?
(maybe detect VNC before that call, but how?)

Note: I'm using VNC 4.1.1+X4.3.0-2.
Here's the xdpyinfo output in that mode:

name of display:    :1.0
version number:    11.0
vendor string:    The XFree86 Project, Inc
vendor release number:    40300000
XFree86 version: 4.3.0
maximum request size:  4194300 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    2
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x400013, revert to Parent
number of extensions:    23
    BIG-REQUESTS
    DEC-XTRAP
    DOUBLE-BUFFER
    Extended-Visual-Information
    FontCache
    GLX
    LBX
    MIT-SCREEN-SAVER
    MIT-SHM
    MIT-SUNDRY-NONSTANDARD
    RECORD
    SECURITY
    SGI-GLX
    SHAPE
    SYNC
    TOG-CUP
    VNC-EXTENSION
    X-Resource
    XC-APPGROUP
    XC-MISC
    XFree86-Bigfont
    XTEST
    XVideo
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    1024x768 pixels (260x195 millimeters)
  resolution:    100x100 dots per inch
  depths (2):    1, 16
  root window id:    0x2e
  depth of root window:    16 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x21
  default number of colormap cells:    64
  preallocated pixels:    black 0, white 65535
  options:    backing-store YES, save-unders YES
  largest cursor:    1024x768
  current input event mask:    0xd83f3f
    KeyPressMask             KeyReleaseMask           ButtonPressMask          
    ButtonReleaseMask        EnterWindowMask          LeaveWindowMask          
    Button1MotionMask        Button2MotionMask        Button3MotionMask        
    Button4MotionMask        Button5MotionMask        ButtonMotionMask         
    SubstructureNotifyMask   SubstructureRedirectMask PropertyChangeMask       
    ColormapChangeMask       
  number of visuals:    8
  default visual id:  0x24
  visual:
    visual id:    0x24
    class:    TrueColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0xf800, 0x7e0, 0x1f
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x25
    class:    TrueColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x26
    class:    TrueColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x27
    class:    TrueColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x28
    class:    DirectColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x29
    class:    DirectColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x2a
    class:    DirectColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x2b
    class:    DirectColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0x3f, 0x7c0, 0xf800
    significant bits in color specification:    8 bits


-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
                            1 + e ^ ( i * pi ) = 0