forums.ps2dev.org

[protomank]

I was creating a very simple SDL program that tries to load a png file and show it, but then it hit me: looks like PS2 filesystem is not so easy that using picture = IMG_Load("./img.png"); works :-P

So, it seems like I have to somehow use mass: (I'm running the code form a USB pendrive) or semething like that...
Are there any instructions or tutorials for begginers on this filesystem behavior?

Thanks in advance.

[Lukasz]

The prefix you are refering to is the device string. When accessing files you prefix the filename with the devices string to tell the PS2 which device you want load the file from. This makes it much simpler to access files on different devices, as you always use the same functions.

For instance when access files on your PC when using PS2Link, you use the "host:" prefix, eg. "host:file.txt". The way this works is that you load a device driver (module/IRX) on the IOP and it adds the device string to the file system. This is your interface to the files on the device.

The only devices which are loaded by default are "cdrom0:" (CD/DVD drive access) and "rom0:" (access to BIOS files). Which are both read only.

- PS2Link adds "host:" (read and write).
- The "rom0:MCMAN" module add "mc0:" and "mc1:", memory card 1 and 2 respectively (read and write).
- The usb_mass.irx adds "mass:" which gives you access to the USB mass storage devices such as pendrive/usbsticks (read and write).
- The HDD IRXs in PS2SDK add "hdd0:" support (read and write).

There might be more devies, these are just the ones I can remember off the top of my head.

You just need to load the correct IRX (and any IRXs it is dependent on in the correct order) and you can then access files on the device.
_________________
Lukasz.dk

[protomank]

Thanks, I've see some code to load IRX modules.
But anyway, is there a documentation on hte whole IRX?

I prefer to learn about things, what they are and how they work, instead of just using those for my needs ;)

[Lukasz]

IRX are just IOP Relocatable eXecutable or just programs for the IOP :-)

There is some in depth IRX information available here:

http://ps2dev.org/ps2/Tutorials/TUTORIAL_4_-_PS2_Example_Code/Hello_IOP!__Programming_on_the_IO_Processor
_________________
Lukasz.dk

[protomank]

That was what I wanted.
It's always good to learn the base before building the house ;)

Thanks a lot.

[protomank]

Just another quick question:
I noticed in most examples that there is a kind of order for loading IRX. For example, first the ones from BIOS, then the ones from memory card (as mass). In this case you need to place the irx files in your memory card, right?

So, how some standalone programs such as uLaunchELF and Doom can run, and read files from the mass even without having a CD or Memory Cards inserted? Is there a way to embed, or statiacly link the IRX files?

PS: Sorry if this was already answered, I searched a lot before posting :)

[yoshi314]

[protomank]

Yes, I'm trying, but ps2dev.org is down, so I can't see the code right now.
But searching on the net, I found they just placed the soruce code of the usb irx driver into their code. This is the hard way IMHO.

But the doom port has, for example, integrated the wad file into the elf somehow, so it probally can be done also for the IRX binary.

[ragnarok2040]

You define a rule to convert the irx module into a data buffer in assembly or C using bin2s or bin2c for embedding into the project. The command is:

[protomank]

Yes, great to have all the info in one place.
Thanks a lot ragnarok :)

This shold solve my distribution problems, so I now can start developing SDL apps for PS2 without major problems. Just need to test image and ttf loading later tonight and I'm done. It was a while since I had this fun developing, HTML/Javascript/PHP just drain your energies after a while ;)

[protomank]

All modules loaded great. But SDL does not seems to reconize mass anyway.
Looks like I'll either have to hack the SDL library or find a way to IMG_load to use a buffer instead of a filename.

As far as I know, no one is using SDL IMG_Load in PS2 currently, right?

[protomank]

For some reason I can't load files from mass, from mc0 it seems to work fine, exept SDL IMG_Load does not work giving a "Can't seek data" error, but this is expecting as memory card probally does not support seek.

Here is my code, image.c

[Lukasz]

You have only loaded the USB driver usbd.irx, you also need to load the USB mass driver usb_mass.irx.
_________________
Lukasz.dk

[protomank]

Hum, I see. I left it out because I tought it was not needed, and also because the PS2SDK did not came with it (at least the one I compiled) :)

Looks good, I'll to find it later today.

[protomank]

Tip for anyone looking here in the future, IMG_load does not work, it seems like there is a bug or hardware/software restrictions with fseek, so use this instead:

[protomank]

More information/bugs:

SDL_HWSURFACE crashes when using SDL_CreateRGBSurface, use SDL_SWSURFACE instead and it will work.

SDL_SetColorKey does not seem to be working.

Already compiled my basic code and solved almost all problems (the colorkey transparency will really give me problems), now I'm going to add joystick code to move sprites in the screen. :)

[ragnarok2040]

ps2sdk has had a few bugs with fseek. The last bug, hopefully, was fixed in revision 1509. From looking at SDL's source, it's probably fseek returning -1 on seeking offset 0 and/or ftell returning the wrong offset, too, which was fixed in revision 1509 as well. I don't see anything else that would be wrong. The crt0.s was also modified recently so that argument parsing would work and ps2sdk's libc would be initialized properly. The latest revision should work just fine, :D.

[protomank]

EDIT: Just after posting, found resetIOP seems to fix the problem.

Thanks ragnarok, updating the SDK and recompiling all my libs really helped a lot.

But I believe I found a real and nasty bug:
When loading SIO2MAN using ret = SifLoadModule("rom0:SIO2MAN", 0, NULL); and also loading Joystick in SDL by using SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) the screen goes black, no matter what.

Sadly I no not have a ps2link, so debugging this is uout of my hands :-(

Is there a alternative to SIO2MAN? I need it to fopen and mass to load some image files :-(
I searched doom sdl port and noticed it does not load those Bios modules, but still did not had the time to see what they are doing.

[aries2k]

[protomank]

Yes, I just tested it after a break to play god of war (because I was programming for more than 6 hours when I realized, heheheh) and worked, just changed all rom drivers/irx to X, and worked like a charm.

Transparency I got fixed by using it in the png files itselves, instead of opening and trying to set it in SDL.

Joystick was a bit trick because most of the examples I found using events just did not worked, now using SDL_JoystickUpdate+SDL_JoystickGetButton it works fine, I made a rectangle grow when pessing the square button :D
[ok, this is silly, but I'm proud of it]

Next step is to use SDL_ttf so debugging the program will be WAY easier, and setting a subversion to store the code so other people can use or research.

At the pace things are going, looks like I'll have to start working on the level editor and got some free graphics soon.

[cosmito]

[cosmito]