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Re: [Mesa3d-dev] bug in sphere normal
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From: Dieter <Die...@ha...> - 2001-01-17 00:02:07
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> > Second, "xlockmore" (mode "text3d") crash all the time with the current
> > Mesa
> > GLU. (The self intersections?)
>
[snip]
>
> > Yes, I "see" that it fails in glide3 (without 3DNow!) but it worked last
> > summer...
> >
> > Gareth's code could handle this all.
>
>
> But other people had more trouble with Gareth's code than either the
> old Mesa tessellator or the SI tessellator.
>
> Ideally, someone will fix whatever bugs there may be in the SI
> tessellator.
>
> -Brian
I agree.
Now, a little more debug output of "xlockmore" (latest 5.01ALPHA03):
SunWave1>gdb xlock/xlock core
GNU gdb 19991004
Copyright 1998 Free Software Foundation, Inc.
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welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
Core was generated by `./xlock/xlock -nolock -mode text3d -ttf
/usr/X11/lib/fonts/ttf/'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/X11R6/lib/libSM.so.6...done.
Reading symbols from /usr/X11R6/lib/libICE.so.6...done.
Reading symbols from /usr/X11R6/lib/libXpm.so.4...done.
Reading symbols from /usr/lib/libgltt.so.2...done.
Reading symbols from /usr/lib/libttf.so.2...done.
Reading symbols from /usr/lib/libGL.so.1...done.
Reading symbols from /usr/lib/libGLU.so.1...done.
Reading symbols from /lib/libcrypt.so.1...done.
Reading symbols from /usr/X11R6/lib/libX11.so.6...done.
Reading symbols from /usr/X11R6/lib/libXext.so.6...done.
Reading symbols from /usr/lib/libstdc++-libc6.2-2.so.3...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /usr/lib/libstdc++-libc6.1-2.so.3...done.
Reading symbols from /lib/libpthread.so.0...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_compat.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /usr/X11R6/lib/modules/dri/tdfx_dri.so...done.
Reading symbols from /usr/lib/libglide3.so.3...done.
#0 t3d_anim_default (tp=0x820cfd8) at text3d.cc:475
475 tp->phi += tp->direction * angle_speed;
(gdb) bt
#0 t3d_anim_default (tp=0x820cfd8) at text3d.cc:475
#1 0x8106166 in Animate (tp=0x820cfd8) at text3d.cc:685
#2 0x8054865 in call_callback_hook (ls=0x0, mi=0x820cfd8) at mode.c:1185
#3 0x804ed37 in runMainLoop (maxtime=0, iconscreen=-1) at xlock.c:1823
#4 0x805024b in justDisplay (display=0x820c950) at xlock.c:2513
#5 0x8051ee4 in main (argc=6, argv=0xbffff4ac) at xlock.c:3597
Current language: auto; currently c++
(gdb) l
470
471 /*-------------------------------------------------------------*/
472 static void
473 t3d_anim_default(text3dstruct * tp)
474 {
475 tp->phi += tp->direction * angle_speed;
476 tp->theta += tp->direction * angle_speed;
477 }
478
479 /*-------------------------------------------------------------*/
(gdb) disas
Dump of assembler code for function t3d_anim_default:
0x8105cd0 <t3d_anim_default>: push %ebp
0x8105cd1 <t3d_anim_default+1>: fldl 0x818e560
0x8105cd7 <t3d_anim_default+7>: mov %esp,%ebp
0x8105cd9 <t3d_anim_default+9>: sub $0x14,%esp
0x8105cdc <t3d_anim_default+12>: mov 0x8(%ebp),%eax
0x8105cdf <t3d_anim_default+15>: leave
0x8105ce0 <t3d_anim_default+16>: fildl 0x18(%eax)
0x8105ce3 <t3d_anim_default+19>: flds 0x40(%eax)
0x8105ce6 <t3d_anim_default+22>: fxch %st(1)
0x8105ce8 <t3d_anim_default+24>: fmul %st(2),%st
0x8105cea <t3d_anim_default+26>: faddp %st,%st(1)
0x8105cec <t3d_anim_default+28>: fildl 0x18(%eax)
0x8105cef <t3d_anim_default+31>: fxch %st(1)
0x8105cf1 <t3d_anim_default+33>: fstps 0x40(%eax)
0x8105cf4 <t3d_anim_default+36>: flds 0x44(%eax)
0x8105cf7 <t3d_anim_default+39>: fxch %st(1)
0x8105cf9 <t3d_anim_default+41>: fmulp %st,%st(2)
0x8105cfb <t3d_anim_default+43>: faddp %st,%st(1)
0x8105cfd <t3d_anim_default+45>: fstps 0x44(%eax)
0x8105d00 <t3d_anim_default+48>: ret
End of assembler dump.
Reading symbols from /lib/libnss_compat.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /usr/X11R6/lib/modules/dri/tdfx_dri.so...done.
Reading symbols from /usr/lib/libglide3.so.3...done.
#0 t3d_anim_default (tp=0x820cfd8) at text3d.cc:475
475 tp->phi += tp->direction * angle_speed;
(gdb) bt
#0 t3d_anim_default (tp=0x820cfd8) at text3d.cc:475
#1 0x8106166 in Animate (tp=0x820cfd8) at text3d.cc:685
#2 0x8054865 in call_callback_hook (ls=0x0, mi=0x820cfd8) at mode.c:1185
#3 0x804ed37 in runMainLoop (maxtime=0, iconscreen=-1) at xlock.c:1823
#4 0x805024b in justDisplay (display=0x820c950) at xlock.c:2513
#5 0x8051ee4 in main (argc=6, argv=0xbffff4ac) at xlock.c:3597
Current language: auto; currently c++
(gdb) l
470
471 /*-------------------------------------------------------------*/
472 static void
473 t3d_anim_default(text3dstruct * tp)
474 {
475 tp->phi += tp->direction * angle_speed;
476 tp->theta += tp->direction * angle_speed;
477 }
478
479 /*-------------------------------------------------------------*/
(gdb) disas
Dump of assembler code for function t3d_anim_default:
0x8105cd0 <t3d_anim_default>: push %ebp
0x8105cd1 <t3d_anim_default+1>: fldl 0x818e560
0x8105cd7 <t3d_anim_default+7>: mov %esp,%ebp
0x8105cd9 <t3d_anim_default+9>: sub $0x14,%esp
0x8105cdc <t3d_anim_default+12>: mov 0x8(%ebp),%eax
0x8105cdf <t3d_anim_default+15>: leave
0x8105ce0 <t3d_anim_default+16>: fildl 0x18(%eax)
0x8105ce3 <t3d_anim_default+19>: flds 0x40(%eax)
0x8105ce6 <t3d_anim_default+22>: fxch %st(1)
0x8105ce8 <t3d_anim_default+24>: fmul %st(2),%st
0x8105cea <t3d_anim_default+26>: faddp %st,%st(1)
0x8105cec <t3d_anim_default+28>: fildl 0x18(%eax)
0x8105cef <t3d_anim_default+31>: fxch %st(1)
0x8105cf1 <t3d_anim_default+33>: fstps 0x40(%eax)
0x8105cf4 <t3d_anim_default+36>: flds 0x44(%eax)
0x8105cf7 <t3d_anim_default+39>: fxch %st(1)
0x8105cf9 <t3d_anim_default+41>: fmulp %st,%st(2)
0x8105cfb <t3d_anim_default+43>: faddp %st,%st(1)
0x8105cfd <t3d_anim_default+45>: fstps 0x44(%eax)
0x8105d00 <t3d_anim_default+48>: ret
End of assembler dump.
Conclusion: This seems not to be a GLU bug.
-Dieter
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