I didn't think the GLX code in XFree86 (Mesa based, or DRI) knew
anything about overlays.
Mark.
On Wed, 27 Feb 2002, Barry Branham wrote:
> I'm having trouble getting an overlay visual with the following code:
>
> int n = 0, list[5];
> list[n++] = GLX_LEVEL; // overlay planes
> list[n++] = 0; // overlay planes
> list[n++] = GLX_BUFFER_SIZE; // get at least 2 bits
> list[n++] = 2;
> list[n++] = None;
>
> vis = glXChooseVisual(XtDisplay(_mgrWidget),
> XScreenNumberOfScreen(XtScreen(_mgrWidget)), list);
>
> the return is NULL.
>
> I'm using RedHat 7.2 with all the latest updates including XFree86 4.1.0-15
> I've used the 'Option "overlay"' line in XF86Config-4.
> My root visual is TrueColor by starting the Xserver with '-cc 4'
> I'm using the latest Matrox drivers. mga_hal is loaded but 'DRI' is not
> enabled.
>
> glxinfo -t gives:
>
> [cts6 bhb]$ glxinfo -t
> display: :0.0 screen:0
> direct rendering: No
> server glx vendor string: SGI
> server glx version string: 1.2
> server glx extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
> client glx vendor string: SGI
> client glx version string: 1.2
> client glx extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
> GLX extensions:
> GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_import_context
> OpenGL vendor string: VA Linux Systems, Inc.
> OpenGL renderer string: Mesa GLX Indirect
> OpenGL version string: 1.2 Mesa 3.4.2
> OpenGL extensions:
> GL_ARB_multitexture, GL_EXT_abgr, GL_EXT_blend_color,
> GL_EXT_blend_minmax, GL_EXT_blend_subtract
> glu version: 1.1 Mesa 3.4.2
> glu extensions:
> GL_EXT_abgr
>
> Vis Vis Visual Trans buff lev render DB ste r g b a aux dep
> ste accum buffers MS MS
> ID Depth Type parent size el type reo sz sz sz sz buf th
> ncl r g b a num bufs
>
>----------------------------------------------------------------------------------------------------
> 0x25 8 PseudoColor 0 24 0 ci 1 0 0 0 0 0 0 16
> 0 0 0 0 0 0 0
> 0x26 8 GrayScale 0 24 0 ci 1 0 0 0 0 0 0 16
> 0 0 0 0 0 0 0
> 0x27 24 TrueColor 0 24 0 rgba 1 0 8 8 8 0 0 16
> 0 0 0 0 0 0 0
> 0x28 24 TrueColor 0 24 0 rgba 1 0 8 8 8 0 0 16
> 8 16 16 16 0 0 0
>
>
> So there is a PseudoColor visual available. But it's level is 0. I
> need a GLX_LEVEL 1 visual.
>
> Any suggestions will be much appreciated.
> Thanks
> Barry
>
>
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