Clip texturing problems.

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From: Robert Doyle (doyle++at++overlord.nrl.navy.mil)
Date: 06/28/2000 11:38:05

Machine: Onyx1-IR, 4 CPU, 2RM, Irix 6.5.7

Performers:

I'm encountering clip texturing problems causing core dumps. The problem
occurs only in multiprocessor mode or when using display lists with
pfuTravSetDListMode(). If I run in single-processor mode or in
multiprocessor mode with display lists disabled, the problem does not
occur.

In addition, the probability of a core dump increases with data base
size. Terrain with 90,000 triangles will core dump within minutes while
terrain with 20,000 triangles has not core dumped at all. All terrain
uses a 16K X 16K map. I can observe broad lines of incorrect texture
appearing when error messages (see below) begin to be printed. There
appear to be no problems with shared memory and performance is otherwise
very good.

The clip texture is loaded using pfdLoadClipTexture() and the code is
similar to that found in
/usr/share/Performer/src/pguide/libpf/C/cliptex.c.

The error messages are:
 
PF Warning/Usage: pfMemory::unref() Attempt to unreference
memory
with 0 reference count.
PF Warning/Usage: pfMemory::unref() Attempt to unreference
memory
with 0 reference count.
PF Warning/Usage: pfMemory::ref() Reference count has
wrapped!
Clamping to 16777215
PF Warning/Usage: pfMemory::unref() Attempt to unreference
memory
with 0 reference count.
PF Notice(12): Caught SIGCHLD. Exiting due to death of
child
with pid 25082.

dbx shows:

dbx version 7.2.1 Mar 13 1998 19:00:36
Core from signal SIGBUS: Bus error
(dbx) where
> 0 pfTexLoad::pr_apply(void)(0x11, 0xffffffff, 0xf, 0x1, 0x4e460dc0, 0x1,
0x2418cdc, 0x400)
["/xlv61/performer/work/perf/lib/libpr/pfTexLoad.C":779,
0x1e3b6d4]
   1 pfDispList::pr_caseDL_APPLYTLOAD(const DLElt*)(0x11, 0xffffffff,
0xf, 0x1,
0x4e460dc0, 0x1, 0x2418cdc, 0x400)
["/xlv61/performer/work/perf/lib/libpr/pfDispList.C":1342, 0x1da2984]
   2 pfDispList::pr_drawFlat(void)(0x4f9c1d90, 0xffffffff, 0xf, 0x1,
0x4f9c1ec8,
0x1, 0x2418cdc, 0x400)
["/xlv61/performer/work/perf/lib/libpr/pfDispList.C":3858, 0x1da0700]
   3 pfDispList::draw(void)(0x11, 0xffffffff, 0xf, 0x1, 0x4e460dc0, 0x0,
0x2418cdc, 0x400)
["/xlv61/performer/work/perf/lib/libpr/pfDispList.C":660,
0x1d9fb10]
   4 pfPipe::pf_drawIncrementalState(void)(0x0, 0xffffffff, 0xf, 0x1,
0x4e460dc0, 0x1, 0x2418cdc, 0x400)
["/xlv61/performer/work/perf/lib/libpf/pfPipe.C":2353, 0x1ce9034]
   5 ::mpDraw(void)(0x11, 0xffffffff, 0xf, 0x0, 0x4e460dc0, 0x0, 0x0,
0x400)
["/xlv61/performer/work/perf/lib/libpf/pfProcess.C":6281, 0x1d56b08]
   6 ::pfConfig(0x0, 0x0, 0xf, 0x1, 0x0, 0x0, 0x0, 0x400)
["/xlv61/performer/work/perf/lib/libpf/pfProcess.C":2851, 0x1d4af54]
   7 ::main(0x2, 0x7fff2f34, 0xf, 0x1, 0x4e460dc0, 0x1, 0x2418cdc,
0x400)
["/movies3/doyle/terrain-current/pgl-terrain/pgl.C":122, 0x1000a82c]
   8 __start()
["/xlv55/kudzu-apr12/work/irix/lib/libc/libc_n32_M4/csu/crt1text.s":177,
0x1000a428]
(dbx) q

I'll be glad to provide more information if needed.

Thanks,
Bob Doyle 

-- 
Robert J. Doyle, Jr.            http://overlord.nrl.navy.mil
Code 5594                   	e-mail: doyle++at++overlord.nrl.navy.mil
Naval Research Laboratory   	phone: 202-767-8395
Washington, DC  20375-5000  	fax: 202-404-7402

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