forums.ps2dev.org

[DracoLacertae]

I've had the ps2linux kit for quite a while, and want to get myself more into native development. I've been working in a game engine project on the PC, which I want to port over to the ps2, and am considering native mode over linux. Before I start, I have a few questions:

-I've got the latest ps2gl (0.3.1) and got it working in linux fine. I want to use ps2gl in native mode, and see a version on this site that's a bit older. I'm wondering, has anyone here used 0.3.1 with the native ps2dev tools, and if so, how well does it work?

-Memory protection: The heart of my engine is a bytecode interpreter. It runs at ok speed in linux (it just does game scripting), but I think I should write it as a recompiling interpreter. How strict is the memory protection with the native mode kernel? I need to be able to have pages of memory enabled for writing, and then change the permission to enable execution. If possible, I would like +rwx at the same time.

-File access: On the linux version, I just store everything on the linux partition. On the native version, I will have to keep everything on the host filesystem or a memory card. I've seen some hard drive drvers on this site. Do the libraries here only deal with the sony gaming filesystem (i think it's called APA), or can it read from the linux ext2 filesystems?

Thanks!

[Drakonite]

[rinco]

what is a recompiling interpreter?...

Your search - "recompiling interpreter" - did not match any documents.

[Oobles]

I'm not sure I'm right, but feeling like responding anyway.. I think a recompiling interpreter is where byte code is rewritten into mips instructions when loaded. So the initial load of the byte code is slow, but following that all the code is run natively. Similar to JVM hotspot compiler. There's probably a more common name for this technique.

[ooPo]

dynamic recompiling?

[Guest]

[DracoLacertae]

Thanks for the info. Yes, I do have the linux kit. In fact I find using reload1 to be a very clean and easy way to boot programs (Thanks mrbrown) Since the libraries only access APA, I will probably read all the files off of host.

I'm going to try messing around with ps2gl compiled in native mode tonight, and see if I can do anything with it. I'll probably end up back on this forum asking for help. :-) (That is if I have time after my HW. Being a student really sucks for your independent projects; they tend to suffer.)

Oh, the dynamic recompiling is exactly right: I don't know where I got 'recompiling interpreter.' from.

[Oobles]

You might find it easier using dreamGL instead of the linux code. From what I remember of ps2gl it doesn't conform very well to the openGL spec. You also might find it easier than porting the ps2gl code.

[DracoLacertae]

I looked through the DreamGL headers, and couldn't find any blending functions. If dreamGL had fog and alpha blending, it would be practically perfect for what I need. It doesn't seem to have texture coordinate generation, but I can do this myself. Also, does DreamGL support different texture formats? I will quickly use up all the GS ram if I can only use 32bit.

Is ps2gl ready to use 'out of the box,' with ps2dev? I've looked, and the 'uber makefile' has support in it for native mode. Is this leftover from older versions when sony first made it, or does it still work? Has anyone here sucessfully used ps2gl (0.3.1) outside of ps2linux?

I also looked at gslib, and it seems to have most of what I need in terms of rendering primitives, except it doesn't do the 3d math for me. So I'm thinking of taking the 3d math and matrix handling functions from dreamgl and putting them with the primitive drawing and texture functions of gslib. Does this sound like a reasonable idea, or am I shooting myself in the foot?

Also, are there any other graphics libraries for the ps2, that do the 3d matrix/tranform/clipping/projection for you?

[Drakonite]

[mharris]

[DracoLacertae]