I've got a small program that will cause a segfault:
Program received signal SIGFPE, Arithmetic exception.
0x281824d8 in gl_x86_transform_points3_3d_no_rot_raw ()
from /t/video/libGL.so.3
(gdb) bt
#0 0x281824d8 in gl_x86_transform_points3_3d_no_rot_raw ()
from /t/video/libGL.so.3
#1 0x805c2f0 in ?? ()
#2 0x8062ba8 in ?? ()
#3 0x280aa34c in gl_Accum (ctx=0x0, op=GL_FALSE, value=0)
from /t/video/libGL.so.3
#4 0x80c6000 in ?? ()
Yet this doesn't crash when run with a non-mesa OpenGL implementation, so
I'm leaning towards "Mesa Bug" here. This uses OSMesa, and I really don't
have any Mesa system with X installed to see if it's specific to OSMesa or
not. Here's the program given to me by a coworker. It contains a bit of our
specific glue to draw it using our display system, so ignore that bit. :)
This is using FreeBSD, which traps a lot of FP exceptions by default, should
I be turning these off?
-- Kevin
static char const rcsid[]=
"$Header: /TouchMaster_II/2.0x/contrib/OpenGl Example/junk_2.c 1 4/11/00 4:06p
Mark $ ";
#include "/t/system/gamedef.h"
#include "/t/video/GL/osmesa.h"
#include "/t/video/GL/glu.h"
#include "math.h"
int shmid;
unsigned short *gl_memory;
OSMesaContext ctx;
sdisplaylist *obj;
double xang=0.0,yang=0.0,zang=0.0;
int InitalizeOpenGL(sdisplaylist *o,unsigned short *gl_memory,OSMesaContext *ctx);
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
int main(int argc,char *argv[])
{
int c;
// OS Stuff
CallMeFirst();
OSConnect();
obj=new sdisplaylist;
DeleteObject(USEROID,0);
SetFrameRate(3);
srandom(time(0));
// Background polygon
ClearObject(obj);
obj->width=640;
obj->height=480;
obj->depth=0;
obj->color=0x0000;
obj->flags=DL_FLAGS_POLYGON;
AddObject(obj);
// Open GL object
ClearObject(obj);
obj->useroid=0x4242;
obj->depth=10;
obj->xpos=192;
obj->ypos=112;
obj->width=256;
obj->height=256;
shmid=InitalizeOpenGL(obj,gl_memory,&ctx);
// Setup
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
FadeGammaIn(100,5);
while(!hit)
{
ReadTouchScreen(NULL);
xang+=2.0;
if(xang>360.0) xang-=360.0;
yang+=1.7;
if(yang>360.0) yang-=360.0;
zang+=2.2;
if(zang>360.0) zang-=360.0;
CommitObjects();
WaitForVsync();
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(0.0,0.0,-8.0);
glRotated(xang,1.0,0.0,0.0);
glRotated(yang,0.0,1.0,0.0);
glRotated(zang,0.0,0.0,1.0);
glBegin(GL_QUADS);
glColor3ub(255,0,0);
glVertex3f(1.0,1.0,1.0);
glColor3ub(0,255,0);
glVertex3f(-1.0,1.0,1.0);
glColor3ub(255,255,0);
glVertex3f(-1.0,-1.0,1.0);
glColor3ub(0,0,255);
glVertex3f(1.0,-1.0,1.0);
glColor3ub(255,0,0);
glVertex3f(1.0,1.0,-1.0);
glColor3ub(0,255,0);
glVertex3f(-1.0,1.0,-1.0);
glColor3ub(255,255,0);
glVertex3f(-1.0,1.0,1.0);
glColor3ub(0,0,255);
glVertex3f(1.0,1.0,1.0);
glColor3ub(255,0,0);
glVertex3f(1.0,-1.0,-1.0);
glColor3ub(0,255,0);
glVertex3f(-1.0,-1.0,-1.0);
glColor3ub(255,255,0);
glVertex3f(-1.0,1.0,-1.0);
glColor3ub(0,0,255);
glVertex3f(1.0,1.0,-1.0);
glColor3ub(255,0,0);
glVertex3f(1.0,-1.0,1.0);
glColor3ub(0,255,0);
glVertex3f(-1.0,-1.0,1.0);
glColor3ub(255,255,0);
glVertex3f(-1.0,-1.0,-1.0);
glColor3ub(0,0,255);
glVertex3f(1.0,-1.0,-1.0);
glColor3ub(255,0,0);
glVertex3f(1.0,1.0,-1.0);
glColor3ub(0,255,0);
glVertex3f(1.0,1.0,1.0);
glColor3ub(255,255,0);
glVertex3f(1.0,-1.0,1.0);
glColor3ub(0,0,255);
glVertex3f(1.0,-1.0,-1.0);
glColor3ub(255,0,0);
glVertex3f(-1.0,1.0,1.0);
glColor3ub(0,255,0);
glVertex3f(-1.0,1.0,-1.0);
glColor3ub(255,255,0);
glVertex3f(-1.0,-1.0,-1.0);
glColor3ub(0,0,255);
glVertex3f(-1.0,-1.0,1.0);
glEnd();
glFlush();
glPopMatrix();
}
FadeGammaOut(100,GAMMA_FADE_OUT);
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
int InitalizeOpenGL(sdisplaylist *o,unsigned short *gl_memory,OSMesaContext *ctx)
{
int shmid;
sdisplaylist *obj=new sdisplaylist;
GLfloat h=(GLfloat)o->height/(GLfloat)o->width;
// Create open gl object
ClearObject(obj);
obj->useroid=o->useroid;
obj->width=o->width;
obj->height=o->height;
obj->usermisc=32;
gl_memory=ShareRegion(obj,&shmid);
CommitObjects();
WaitForVsync();
// Add open gl object
ClearObject(obj);
obj->useroid=o->useroid;
obj->key=shmid;
obj->depth=o->depth;
obj->xpos=o->xpos;
obj->ypos=o->ypos;
AddObject(obj);
CommitObjects();
delete obj;
// Create open gl context
*ctx=OSMesaCreateContext((GLenum)OSMESA_ARGB,NULL);
OSMesaMakeCurrent(*ctx,gl_memory,GL_UNSIGNED_BYTE,o->width,o->height);
// View settings
glClearColor(0.5,0.0,1.0,1.0);
glViewport(0,0,(GLint)o->width,(GLint)o->height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0,1.0,-h,h,5.0,500.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// Culling
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
glCullFace(GL_BACK);
return(shmid);
}
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