HOWTO: Creating Simple Game Levels With SDL

[Mickeysofine1972]

Hi

You can find our latest HOWTO on games development on the Ubuntu Games Developer Resource Wiki!

Heres the link:
http://ubuntu-gamedev.pbwiki.com/

Mike

[hod139]

I tried running this example and it seg faulted on me.


./maze
Fatal signal: Segmentation Fault (SDL Parachute Deployed)
After running a backtrace, the problem seems to be line 67


(gdb) bt
#0 0xb7eb53d2 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
#1 0x08048f6d in DrawScene () at maze.cpp:67
#2 0x0804a0b2 in main (argc=1, argv=0xbf831b14) at maze.cpp:440


I spent a few minutes looking at the code, and couldn't figure out the bug. I'll spend more time looking tonight if no one else finds it first.

[Mickeysofine1972]

Can I ask? did you compile this on a windows or Linux system?

I have compiled this a few time and never gotten that happen myself. Even when I put -Wall on the end of my compile command it only points out that there is a unused SDL_Rect in the Main().

Mike

[hod139]

Running standard install of Ubuntu Dapper. Just to be certain, I re-downloaded the tarbal, extracted it, and ran:


g++ `sdl-config --cflags --libs` -o maze maze.cpp -lSDL -lSDL_image
./maze
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

When I compile in debug mode, and run gdb,


g++ -g `sdl-config --cflags --libs` -o maze maze.cpp -lSDL -lSDL_image
gdb ./maze
(gdb) run
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1214110016 (LWP 17969)]
0xb7f083d2 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
(gdb) bt
#0 0xb7f083d2 in SDL_UpperBlit () from /usr/lib/libSDL-1.2.so.0
#1 0x08048f6d in DrawScene () at maze.cpp:67
#2 0x0804a0b2 in main (argc=1, argv=0xbff86dd4) at maze.cpp:440


I'll have more time to look at it tonight, at first glance it isn't obvious what is wrong.