I have problems with Freepascal 2.1.1 using Mac OS X 10.4.2 Tiger when running Freepascal Applications which use OpenGL and glut. The sources are compiled without any warnings but when i run them on the shell they crash instantly with an unhandled exeception EInvalidOp: Invalid floating point operation and some memory adresses shown on the screen. The strange thing about this is when i start the programs after i ran an application using glut written in C or C++, i can start my freepascal programs and they run without any error. They then just crash, when they are running in window mode and i click on the services menuitem in the program menu (they crash with the same exception EInvalidOP: Invalid floating point operation, but some times even this works). After quitting the freepascal open gl program my terminal (shell) is not working correctly anymore (happens only when running OpenGL applications with glut), keystrokes are not seen anymore and CRLF doesn't work any longer. Intrestingly this also happens with Linux Version of the compiler (PPC). The same sources compiled with the windows version under Windows XP are working without any errors or problems. The sources where running on my ibook g4 with Mac OS X 10.3 Panther and Freepascal 1.9.9.5 without any problems, so i can't tell whether it is Tiger or the new beta version of the free pascal compiler or some faults on my system which cause the problems.

I have problems with Freepascal 2.1.1 using Mac OS X 10.4.2 Tiger when running Freepascal Applications which use OpenGL and glut.

just a small remark from me as maintainer of the OpenGL package: Unfortunately I cannot help you in this matter, as I don't have a MacOS X system for testing.
But who enabled OpenGL for Mac anyway...?

- Sebastian

Probably Jonas?

I don't know, but it already worked on the older versions of fpc (before 2.0.0) on Mac OS X 10.3 Panther quite nice and without any errors.

The error message i do now get on the console (after the program crashes) is the following:

An unhandled exception occurred at $903E68B8 :
EInvalidOp : Invalid floating point operation
$903E68B8
$945772A0
$94577184
$9029C2F4
$9029D43C
$9029BDA4
$9029BB6C
$945769B0
$94575444
$903E1B84
$903E103C
$903E028C
$945E2884
$903DECC8
$903DEC18
$903DEA30
$9024F74C

So it first seems to be some error in the fpu code generation of the compiler. But the strange things is, after running a C-Program which uses glut and open gl everything just works fine. So maybe there is something wrong in the open gl / glut initialization part or some incompatibilities with Mac OS X 10.4

Here's a very minimalistic fpc opengl glut program which produces the error from above:

Program Tutor01;
Uses GL, GLUT;
Procedure reshape(width, height : longint); CDecl;
Var aspect : glFloat;
Begin
  glViewport(0, 0, width, height); //change viewport to complete window
  if height <= 0 then height := 1; // just to be sure that there will be no
division by zero
  glMatrixMode(GL_PROJECTION);     //I want to change the projection matrix
  glLoadIdentity;                  //First load the identity matrix
  aspect := width / height;        //calculate the aspect ratio
  glFrustum(-1.0*aspect, 1.0*aspect, 1.0, -1.0, 1.0, 20.0); //and produce
our viewing space
  glMatrixMode(GL_MODELVIEW);      //someone might want to change the
viewing matrix, so switch back
  glLoadIdentity;                  //load the identity matrix
  glutPostRedisplay;               //tell GLUT we want to draw
End;
Procedure draw; CDecl;
Begin
  glClear(GL_COLOR_BUFFER_BIT);    //clear the screen or window
  glBegin(GL_QUADS);               //we want to draw a QUAD
    glVertex3f(-0.5, -0.5, -2.0);  //top-left corner
    glVertex3f(-0.5,  0.5, -2.0);  //bottom-left corner
    glVertex3f( 0.5,  0.5, -2.0);  //bottom-right corner
    glVertex3f( 0.5, -0.5, -2.0);  //top-right what, yes, corner
  glEnd;
  glFlush;                  //tell OpenGL is should empty its command buffer
(execute all commands)
  glutSwapBuffers;          //tell GLUT to actually show the nice white
square
End;
Begin
  glutInit(@argc, argv);           //let GLUT do some initialization
  glutInitDisplayMode(GLUT_RGB or GLUT_DOUBLE); //make the window highcolor,
double buffered
  glutCreateWindow('Tutorial 01'); //now create the first window
  glutDisplayFunc(@draw);          //register callback functions
  glutReshapeFunc(@reshape);
  glutMainLoop;                    //and now actually run
End.

After running the program i get the following error report from Mac OS:

Date/Time: 2005-11-01 21:48:36.593 +0100
OS Version: 10.4.2 (Build 8C46)
Report Version: 3

Command: Tutorial1
Path: ./Tutorial1
Parent: bash [139]

Version: ??? (???)

PID: 224
Thread: 0

Exception: EXC_ARITHMETIC (0x0003)
Code[0]: 0x00000003
Code[1]: 0xe2002193

Thread 0 Crashed:
0 com.apple.CoreGraphics 0x903e68b8 mergeQuadratic + 1176 1 com.apple.CoreGraphics 0x903e5be4 CGSScanconverterRenderMask + 212 2 libCGATS.A.dylib 0x945772a0 glyph_path_end + 212 3 libCGATS.A.dylib 0x94577184 EndPath + 92 4 ATS 0x9029c2f4 ProcessQuadraticOutlinePath(unsigned long, unsigned short const*, unsigned long, unsigned char* const*, void const*) + 1000
5 ATS 0x9029d43c OldGlyphsCacheRun(TStrike*, int, unsigned long, unsigned short const*, void (*)(unsigned long, unsigned short const*, unsigned long, unsigned char* const*, void const*), void*) + 536 6 ATS 0x9029bda4 _eGCGetGlyphNativeOutlinePath + 532 7 ATS 0x9029bb6c GCGetGlyphNativeOutlinePath + 112 8 libCGATS.A.dylib 0x945769b0 ats_path_builder_get_paths + 344 9 libCGATS.A.dylib 0x94575444 ats_32bit_create_glyph_bitmaps + 612 10 com.apple.CoreGraphics 0x903e1b84 build_missing_bitmaps + 484 11 com.apple.CoreGraphics 0x903e103c lock_bitmaps + 432 12 com.apple.CoreGraphics 0x903e028c CGFontLockBitmaps + 368 13 libRIP.A.dylib 0x945e2884 ripc_DrawGlyphs + 1204 14 com.apple.CoreGraphics 0x903decc8 CGContextDelegateDrawGlyphs + 108 15 com.apple.CoreGraphics 0x903dec18 drawGlyphs + 284 16 com.apple.CoreGraphics 0x903dea30 CGContextShowGlyphsWithAdvances + 208 17 com.apple.CoreText 0x9024f74c TLine::DrawGlyphs(CGContext*) const + 116
18 com.apple.CoreText 0x90210c34 CTLineDraw + 88 19 com.apple.HIToolbox 0x9315a674
TCoreTextEngine::DrawThemeTextBox(_HIThemeTextInfo*, CGRect const&, unsigned long, CGContext*) + 1128
20 com.apple.HIToolbox 0x93159f3c DataEngine::DrawTextBox(__CFString const*, CGRect const*, _HIThemeTextInfo*, CGContext*) + 168 21 com.apple.HIToolbox 0x93159d9c HIThemeDrawTextBox + 304 22 com.apple.HIToolbox 0x9315988c
HIMenuBarView::DrawTextTitle(MenuData*, CGRect const*, __CFString const*, unsigned short, CGContext*) + 244
23 com.apple.HIToolbox 0x93153d44 HIMenuBarView::DrawSelf(short, __HIShape const*, CGContext*) + 744
24 com.apple.HIToolbox 0x93153808 HIView::DrawCacheOrSelf(short, __HIShape const*, CGContext*) + 328
25 com.apple.HIToolbox 0x93153564 HIView::SendDraw(short, OpaqueGrafPtr*, __HIShape const*, CGContext*) + 100 26 com.apple.HIToolbox 0x932b38c0
HIView::RecursiveDrawComposited(__HIShape const*, unsigned long, HIView*, CGContext*, unsigned char) + 548
27 com.apple.HIToolbox 0x932b39e0
HIView::RecursiveDrawComposited(__HIShape const*, unsigned long, HIView*, CGContext*, unsigned char) + 836
28 com.apple.HIToolbox 0x932b3640 HIView::DrawComposited(short, OpaqueGrafPtr*, __HIShape const*, unsigned long, HIView*, CGContext*) + 580 29 com.apple.HIToolbox 0x93143178
UpdateWindowVisibility(VisChangeState*) + 340
30 com.apple.HIToolbox 0x93142f8c _ShowHideWindows + 160 31 com.apple.HIToolbox 0x93142edc ShowHide + 36 32 com.apple.HIToolbox 0x931528c8 MBarDraw() + 76 33 com.apple.HIToolbox 0x9314a884 DrawMenuBar + 172 34 com.apple.HIToolbox 0x9314ac68 ShowBar(unsigned char, unsigned char)
+ 312
35 com.apple.HIToolbox 0x931f7254 SetSystemUIMode + 240 36 com.apple.AppKit 0x936203fc -[NSApplication finishLaunching] + 476
37 com.apple.glut 0x97ac92fc -[GLUTApplication run] + 112 38 com.apple.glut 0x97ad9a78 glutMainLoop + 164 39 Tutorial1 0x00002d58 main + 168
40 Tutorial1 0x000025cc start + 412 41 Tutorial1 0x0000246c start + 60

Thread 0 crashed with PPC Thread State 64:
srr0: 0x00000000903e68b8 srr1: 0x000000000210f930
vrsave: 0x0000000000000000
cr: 0x44422428 xer: 0x0000000000000004 lr: 0x00000000903e5be4 ctr: 0x0000000000000000
r0: 0x0000000043300000 r1: 0x00000000bfffa410 r2: 0x00000000ffffffff r3: 0x000000000285d508
r4: 0x0000000002867490 r5: 0x0000000000000038 r6: 0x00000000ffffffff r7: 0x0000000000000004
r8: 0x000000000000000b r9: 0x0000000090686428 r10: 0x0000000000000004 r11: 0x0000000000000005
r12: 0x0000000000000005 r13: 0x0000000000000000 r14: 0x0000000000000001 r15: 0x0000000000000000
r16: 0x0000000000000002 r17: 0x0000000000000002 r18: 0x0000000000000001 r19: 0x00000000bfffb954
r20: 0x00000000bfffc1dc r21: 0x0000000000000007 r22: 0x0000000000000000 r23: 0x00000000022f4330
r24: 0x0000000000000018 r25: 0x00000000bfffa4e0 r26: 0x000000000285dc00 r27: 0x00000000fffffffd
r28: 0x0000000000000070 r29: 0x0000000000000000 r30: 0x0000000000000038 r31: 0x00000000903e6428

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Model: PowerBook6,5, BootROM 4.8.5f0, 1 processors, PowerPC G4 (1.1), 1.07 GHz, 512 MB
Graphics: ATI Mobility Radeon 9200, ATY,RV280M9+, AGP, 32 MB Memory Module: DIMM0/BUILT-IN, 256 MB, built-in, built-in Memory Module: DIMM1/J31, 256 MB, DDR SDRAM, PC2700U-25330 AirPort: AirPort Extreme, 400.17 (3.90.34.0.p11)
Modem: Jump, , V.92, Version 1.0,
Network Service: Ethernet (integriert), Ethernet, en0 Parallel ATA Device: MATSHITACD-RW CW-8123,
Parallel ATA Device: FUJITSU MHT2030AT, 27.94 GB

I will try to run this on Mac OS X 10.3 to see what happens there, will try to build a snapshot version of the fpc compiler (with olle's help) but if anybody has some idea why this does not work, i would be happy to hear about it.

Thanks for your help.

Just a guess - could this be the same problem as discussed in the

Regards,

Adriaan van Os

Yes, probably, and that also explains why I can't reproduce this problem (the other problem didn't occur on my system either). You an try whether it's this by adding "uses macpas" to the start of your program, that one turns off the overflow/underflow exceptions.

Jonas

----- Original Message -----

Matthias Krenzer wrote

1.) Why are the fpc applications running fine after running some open gl applications written in c ? (maybe i didn't get it yet, sorry)

Since we don't know what the bug in the Carbon framework is, that's hard to guess. And for some people, C programs in which the fpu overflow exceptions are enabled crash as well.

2.) It does not sound very safe to turn of the floating point exceptions forever (or at least until Mac OS X 10.5).

There's nothing unsafe about it (except if you want your program to crash if it produces an fpu overflow).

Is there any possibility to create some clean workaround without needing the divine intervention of the apple fixing the carbon libs in 10.4 ?

Since no one has a clue what causes the problem (except that it seems to have something to do with fonts and possibly language settings), I'm not sure how we could make another workaround than disabling the exceptions.

Jonas

would it be feasible to turn them off just for calls into the carbon framework and have them on the rest of the time?

What does the CrashReporter log look like ? For what system calls does it crash in your code ? Try to wrap those calls with fpu exception disablers/enablers.

Regards,

Adriaan van Os

peter green wrote

would it be feasible to turn them off just for calls into the carbon framework and have them on the rest of the time?

How do you propose that the compiler could find out whether or not a procedure resides in the Carbon framework, or possibly eventually calls through to the Carbon framework? Not to mention callbacks for carbon timers etc...

Jonas

http://lists.freepascal.org/lists/fpc-devel/2005-November/006353.html

For what system calls does it crash in your code ?

The problem is that it doesn't crash on my G5 nor on my iBook G4. It only crashes on some people's systems. And it crashes very deep inside calls below carbon actually, in CoreGraphics, while constructing some font path (the above crashlog doesn't even mention Carbon, but the previous GUI hello-world crash logs did, which is why I was talking about Carbon all the time).

Try to wrap those calls with fpu exception disablers/enablers.

You'd have to wrap anything which will potentially draw a glyph on screen. That's not feasible, I think.

Jonas