[Mesa3d-dev] Re: GLX indirect rendering broken

Brian Paul brian.paul at tungstengraphics.com
Fri Sep 23 07:02:03 PDT 2005

Alex Deucher wrote:
> On 9/21/05, Brian Paul <brian.paul at tungstengraphics.com> wrote:
>>Brian Paul wrote:
>>>I was going to look into bug 4087 so I updated my CVS tree and did a
>>>fresh build.  Indirect rendering seems to be quite broken.  Almost
>>>everything I try running produces a protocol error:
>>>$ ./gears
>>>X Error of failed request:  BadLength (poly request too large or
>>>internal Xlib length error)
>>>  Major opcode of failed request:  143 (GLX)
>>>  Minor opcode of failed request:  1 (X_GLXRender)
>>>  Serial number of failed request:  37
>>>  Current serial number in output stream:  38
>>>If I set a breakpoint in _XError() I get this stack trace:
>>>(gdb) where
>>>#0  0x009ead66 in _XError () from /usr/X11R6/lib/libX11.so.6
>>>#1  0x009eb557 in _XReply () from /usr/X11R6/lib/libX11.so.6
>>>#2  0xf6ef7e35 in __glXReadReply (dpy=0x8212050, size=0, dest=0x0,
>>>    reply_is_always_array=0 '\0') at indirect.c:70
>>>#3  0xf6ef8a9e in __indirect_glGenLists (range=1) at indirect.c:400
>>>#4  0xf6f20427 in glGenLists (range=1) at glapitemp.h:100
>>>#5  0x0804a948 in init (argc=1, argv=0xfef6d0e4) at gears.c:318
>>>#6  0x0804ac9a in main (argc=1, argv=0xfef6d0e4) at gears.c:369
>>>Other programs generate the BadLength error from different GL calls.
>>>Is anyone else seeing this?
>>>I'm pretty sure it's a server-side problem and not in libGL.
>>Can anyone confirm this?  Anyone?
> I'm not getting craches, but glxgears cuases my display to blank if I
> move the mouse over the window with both direct and indirect
> rendering.

Which driver?  The whole screen just goes blank?  I haven't heard of 
that happening before.

> Also, on IRC, Michel also mentioned that moving the
> glxgears window with indirect rendering locks the Xserver, but I
> haven't tried that yet myself.

I've fixed a memory corruption problem in Mesa that _might_ explain 
this.  I'll try to verify the fix this weekend.


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