From: Stace Peterson (stacep++at++sgi.com)
Date: 05/13/2005 17:10:27
Dimi,
Sorry about the slow response, but you'll be glad to hear that this bug
(calling pfQuerySys() repeatedly in the pfdBuilder) has been fixed in
our current builds, and will be in the release of Performer 3.2.1.
Thanks,
Stace
Dimi wrote:
>
> Hi,
> I am at the process of creating a loader for a custom format .dsi and I
> am porting the existing IRIX loader to Linux.
> Although it is running fine in IRIX I experienced unexpected
> segmentation faults in Linux.
> After a lot of Debuging I found that it crashes in Linux if the
> pfdBuilder is called multiple times (over 400),
> and that it crashes in pfdBuilder.c line:2538 (function pfdBuild) when
> calling pfQuerySys(PFQSYS_GL, &q);
> I attached a simple test loader which creates 600 polys by calling 600
> times the pfdBuilder. In my machine it crashes after creating 400
> polygons at the above stated command.... In IRIX its working fine
> though.
> I would be gratefull if anyone could have a look at it and acknowledge
> this. If its a Bug please correct the pfdBuilder for future releases.
>
> To solve this Bug I am currently also trying to override the pfdBuild
> function not to call pfQuerySys(PFQSYS_GL, &q).
> Actually this function is NOT needed at all except in the case when you
> set the PFDBLDR_GEN_OPENGL_CLAMPED_TEXTURE_COORDS flag in pfdBuilder.Why
>
> is it called there for every frame? I also noticed that calling this
> function slows down processing tremendously.
>
> Unfortunately although I link in a sepereate copy of pfdBuilder.c when
> creating my libpfdsi.so the functions defined there are not called
> because they are
> overriden by the corresponding functions in libpfdu which have the same
> name. How can I override the functions defined in lipfdu so that my
> pfdBuild function is called?
>
> Thanks in advance
> Dimi
>
> // The simple Loader. It should create a pfGeode with 600 Quads but
> crashes afer calling
> // pfdBuild 400 times.
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> #include <ctype.h>
> #include <math.h>
>
> #include <Performer/pf.h>
> #include <Performer/pfutil.h>
> #include <Performer/pfdu.h>
> #include <Performer/pr/pfGeoSet.h>
> #include <Performer/pr/pfMaterial.h>
> #include <Performer/pr/pfTexture.h>
> #include <Performer/pf/pfNode.h>
> #include <Performer/pf/pfGroup.h>
> #include <Performer/pf/pfGeode.h>
> #include <Performer/pf/pfSCS.h>
>
> extern "C" pfNode *
> pfdLoadFile_dsi (char *fileName)
> {
> pfGroup *scs;
> pfdGeom *prim;
> pfNode *node;
> int j, i, k, l;
>
> /* Restore builder to initial state */
> pfdResetBldrState ();
> pfdResetBldrGeometry ();
>
> scs = new pfGroup ();
>
> /* allocate primitive buffer with max 300 vertices */
> prim = pfdNewGeom (4);
>
> for (int i = 0; i < 600; i++)
> {
> printf("\nPolygon %d", i);
>
> prim->cbind = PFGS_OFF;
> prim->nbind = PFGS_OFF;
> prim->primtype = PFGS_POLYS;
> prim->numTextures = 0;
> prim->flags = 0;
> prim->numVerts = 4;
> for (l = 0; l < PF_MAX_TEXTURES; l++)
> prim->tbind[l] = PFGS_OFF;
>
> // For each vertex in the polygon
> prim->coords[3].set(i, 0, 0);
> prim->coords[2].set(i, 0, 1);
> prim->coords[1].set(i+1, 0, 1);
> prim->coords[0].set(i+1, 0, 0);
>
> pfdAddBldrGeom (prim, 1);
>
> //printf("Exit1 Num of PolyLists\n");
> node = pfdBuild ();
> scs->addChild (node);
> //printf("Exit2 Num of PolyLists \n");
> }
>
> // Release primitive buffer
> pfdDelGeom (prim);
>
> return scs;
> }
>
> --
> Dimi Christopoulos {christop++at++fhw.gr}|
> VR Software Engineer |Web: www.fhw.gr
> Foundation of the Hellenic World |Tel. (+30) 21 254 03800,(+30) 21 034 22292
> Athens - Greece |Fax. (+30) 21 254 03838,(+30) 21 034 22272
>
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-- ------------------------------------------------------------------ Stace Peterson stacep++at++sgi.com Silicon Graphics, Inc. (650) 933-2323
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