SDL tutorials?

SDL tutorials?

[Lincoln Peters]

I've been trying to learn SDL so that I can pitch in on the SDL
interface, but every SDL tutorial I've found on the Internet fails to
compile on my computer.  And I'm fairly sure that the problem isn't my
computer, because I have no difficulty compiling Xconq with the SDL
interface, and I can't quite figure out why.

Any recommended websites or other sources for learning SDL?

---
Lincoln Peters
<sampln@sbcglobal.net>

BOFH excuse #40:

not enough memory, go get system upgrade

Re: SDL tutorials?

[Eric McDonald]

Lincoln Peters wrote:
> I've been trying to learn SDL so that I can pitch in on the SDL
> interface, but every SDL tutorial I've found on the Internet fails to
> compile on my computer.  And I'm fairly sure that the problem isn't my
> computer, because I have no difficulty compiling Xconq with the SDL
> interface, and I can't quite figure out why.
> 
> Any recommended websites or other sources for learning SDL?

The source code of various programs can be instructive. For example, if 
you download the ParaGUI tarball, there are sources for the test 
programs in the 'test' directory. Most of these are simple little apps, 
but can give you a good feel for ParaGUI. I am sure that you can 
probably find similar examples for pure SDL; I would try the sources of 
some of the programs here:
   http://www.libsdl.org/games.php

Also, what sort of troubles are you having wrt compiling the tutorials?

Eric

Re: SDL tutorials?

[Lincoln Peters]

On Mon, 2004-11-15 at 19:02, Eric McDonald wrote:
> Lincoln Peters wrote:
> > I've been trying to learn SDL so that I can pitch in on the SDL
> > interface, but every SDL tutorial I've found on the Internet fails to
> > compile on my computer.  And I'm fairly sure that the problem isn't my
> > computer, because I have no difficulty compiling Xconq with the SDL
> > interface, and I can't quite figure out why.
> > 
> > Any recommended websites or other sources for learning SDL?
> 
> The source code of various programs can be instructive. For example, if 
> you download the ParaGUI tarball, there are sources for the test 
> programs in the 'test' directory. Most of these are simple little apps, 
> but can give you a good feel for ParaGUI. I am sure that you can 
> probably find similar examples for pure SDL; I would try the sources of 
> some of the programs here:
>    http://www.libsdl.org/games.php

I'll look at the 'test' directory and see if I can figure out how it
works.

> 
> Also, what sort of troubles are you having wrt compiling the tutorials?

The code I've included below generates the following errors:

main.o(.text+0x6d):/home/lincoln/test/main.cpp:44: undefined reference to `SDL_SetVideoMode' 
main.o(.text+0xa8):/home/lincoln/test/main.cpp:57: undefined reference to `SDL_Quit' 
collect2: ld returned 1 exit status 

The code itself is (in C++):

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream.h>
#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>

//using namespace std;

//void DrawPixel(SDL_Surface *screen, int x, int y,
//                                    Uint8 R, Uint8 G, Uint8 B);
//void Slock(SDL_Surface *screen);
//void Sulock(SDL_Surface *screen);

int main( /*int argc, char *argv[] */ )
{
  if ( SDL_Init( SDL_INIT_VIDEO ) != 0 ) {
    cout << "Unable to initialize video" << endl;
    return 1;
  }

  SDL_Surface *screen;

  screen = SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE|SDL_DOUBLEBUF );

  if ( screen == NULL ) {
    cout << "Unable to set up window" << endl;
    return 2;
  }

  // Slock( screen );

  // Nothing to do, yet.

  // Sulock( screen );

  SDL_Quit();
  return EXIT_SUCCESS;
}

[End of code]

---
Lincoln Peters
<sampln@sbcglobal.net>

Every program has (at least) two purposes:
	the one for which it was written and another for which it wasn't.

Re: SDL tutorials?

[Eric McDonald]

On Fri, 19 Nov 2004, Lincoln Peters wrote:

> The code I've included below generates the following errors:
> 
> main.o(.text+0x6d):/home/lincoln/test/main.cpp:44: undefined reference to `SDL_SetVideoMode' 
> main.o(.text+0xa8):/home/lincoln/test/main.cpp:57: undefined reference to `SDL_Quit' 
> collect2: ld returned 1 exit status 

Did you remember to link in the SDL libraries?
  g++ main.cpp -o test -lSDL -lSDLmain
or something similar....

Eric

Re: SDL tutorials?

[Lincoln Peters]

On Fri, 2004-11-19 at 15:36, Eric McDonald wrote:
> Did you remember to link in the SDL libraries?
>   g++ main.cpp -o test -lSDL -lSDLmain

Apparently not.  It compiled successfully when I added that.

---
Lincoln Peters
<sampln@sbcglobal.net>

May you have many handsome and obedient sons.