Hi,
I have heard from the xscreensaver maintainer, after I
mentioned that I could run OpenGL xscreensaver hacks
by doing (e.g.)
$ flyingtoasters -root
but that they all failed when launched from
xscreensaver. His reply was:
> The window that it's drawing on might have a
> different visual ID, if the ID printed by
> "xscreensaver-gl-helper" is not the default visual
> (according to xdpyinfo.)
>
> If that's the case, you can't run GL hacks on your
> real root window (only on a virtual root window) and
> there's nothing you can do about it
Well, xscreensaver-gl-helper gives:
$ xscreensaver-gl-helper
0x25
But xdpyinfo says:
$ xdpyinfo
name of display: :0.0
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: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x120000e, revert to PointerRoot
number of extensions: 32
BIG-REQUESTS
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
FontCache
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
RANDR
RECORD
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
TOG-CUP
X-Resource
X3D-PEX
XC-APPGROUP
XC-MISC
XFree86-Bigfont
XFree86-DGA
XFree86-DRI
XFree86-Misc
XFree86-VidModeExtension
XIE
XInputExtension
XKEYBOARD
XTEST
XVideo
default screen number: 0
number of screens: 1
screen #0:
dimensions: 1280x1024 pixels (433x347
millimeters)
resolution: 75x75 dots per inch
depths (7): 16, 1, 4, 8, 15, 24, 32
root window id: 0x49
depth of root window: 16 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 64
preallocated pixels: black 0, white 65535
options: backing-store NO, save-unders NO
largest cursor: 64x64
current input event mask: 0xda001d
KeyPressMask ButtonPressMask
ButtonReleaseMask
EnterWindowMask StructureNotifyMask
SubstructureNotifyMask
SubstructureRedirectMask PropertyChangeMask
ColormapChangeMask
number of visuals: 16
default visual id: 0x23
visual:
visual id: 0x23
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
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: 6 bits
visual:
visual id: 0x25
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x26
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x27
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x28
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x29
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2a
class: TrueColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2b
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2c
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2d
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2e
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x2f
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x30
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x31
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
visual:
visual id: 0x32
class: DirectColor
depth: 16 planes
available colormap entries: 64 per subfield
red, green, blue masks: 0xf800, 0x7e0, 0x1f
significant bits in color specification: 6 bits
So xscreensaver needs visual 0x25 but the default
visual is 0x23. Now I'm not entirely sure what's
happening here, but the xscreensaver author does imply
that this is definitely a driver issue.
Cheers,
Chris
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