Hello
I played around with the OpenGL unit, and I wrote some minimal OpenGL code to get a window: Here is the code:

program glbasic;
uses
  gl, glut;
const
  width = 640;
  height= 480;
procedure drawthings;
begin
  glClearColor(0.0, 0.0, 0.0, 0.0);
 (*will add some more code*);
end;
begin
  glutInit(@argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE or GLUT_RGB);
  glutInitWindowSize( width, height);
  glutInitWindowPosition(0, 0);
  glutCreateWindow('glbasic');
  glutDisplayFunc(@drawthings);
  glutMainLoop();
end.

Now, when I whant to run to code, I get some Run time errors on the console:

Runtime error 216 at 0x4052F5CA
0x4051F5CA
Runtime error 216 at 0x0804C1CA
0x0849C1CA
0x0805127E

etc.
etc.
etc. (about 20 lines)

1). I know not a lot of runtime errors, but after succesfully compiling, that isn`t a fpc bug, is it ? What is the source of this run time error ? (mesa, fpc or my code ?) 2). I think about there isn`t enough code in the drawthings procedure to run succesfull.

What you think ?

Greetings
Karim F.

That piece of code runs fine on my machine, except that my display doesn't support OpenGL GLX Extension :( hehe, need to compile my nvidia kernel drivers...

cheer
sJames

Compile with -gl as additional argument; this will dump the line number and source file of the crash. RTE 216 is an access violation, i.e. some pointer error. But the bug is not necessarily located in your code.

- Sebastian

Missing glut.dll :) ?

uuh yes, that is probably the reason. I've checked the source once more, and while the OpenGL units try to load the libraries for themselves, they will silently discard any exception, which would get raised by missing libs.

- Sebastian