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DiabloTerrorGF · Joined: 15 Jul 2005 Posts: 64

BTW, is there any program to edit txt files on the PSP? some progs open them but all you can do is read...

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

Download Lua Player 0.3

First I've done some measures, to see if it is too slow. This is the code for the old version:

VgSlag · Joined: 30 Jun 2005 Posts: 43

Thanks for your brilliant work so far Shine, I'll be changing my program slightly then I'll show you the tile engine I've been working on.

Thanks again!

DiabloTerrorGF · Joined: 15 Jul 2005 Posts: 64

Hallejuah! Although my game is still kinda slow, atleast putting it to screen seems to not make much of a difference.

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

VgSlag · Joined: 30 Jun 2005 Posts: 43

Shine, I meant a tile based platform game engine.

G

DiabloTerrorGF · Joined: 15 Jul 2005 Posts: 64

nevyn · Joined: 31 Jul 2005 Posts: 136 Location: Sweden

Nice going there. I was thinking last night of how to add a more high-level interface, though I didn't realize that, of course, porting an interpreter is the way...

However, how about adding an interface for loading lua files from the MS, instead of just reading one default one? Then one could just distribute the lua file (and associated graphics), and not the entire interpreter, if one were to distribute a game. (I suppose you could nick the interface for opening files from one of the emulators)

An interactive interpreter (with a virtual keyboard) when no lua file is loaded would be real nice, too.

[edit: Um. We got an interpreter, no need to write stuff in C... I'll give the file browser a shot, just have to learn Lua first...]

(hmm, makes me want to port Python...)

Slopey · Joined: 31 Jul 2005 Posts: 24

First up - many thanks to Shine for the Lua stuff - i can finally code something on my PSP!! :)

Anyway, could somone tell me if it's possible to use Lua to print text to a specific location? I'm looking for a text equivalent of

void printDecimal(int x, int y, int value, int color)

if that's not currently implemented I could presumably come up with a function based on printDecimal to do the same thing however my c/c++ knowledge is limited and I'd probably not be able to make the necessary changes and compile properly.

Has anyone done something similar or can I do it in Lua? Otherwise I'll need to try and come up with a function or use images for each character and write a function in Lua to convert strings in to the appropriate images and location (I suppose at least with that method I can have custom fonts, but the system font would be ok for the moment).

Cheers,
S.

Kinsman · Joined: 18 Jul 2005 Posts: 15 Location: Canada

Kinsman · Joined: 18 Jul 2005 Posts: 15 Location: Canada

Here's a potential LuaPlayer routine..

Mak0 · Joined: 27 Jan 2005 Posts: 36

awesome job on this. major thanks for making pspdev possible for us novice coders :)

BTW: how is that java program to run the scripts on windows/*nix coming? That'll make this excellent utility just that much sweeter.

Slopey · Joined: 31 Jul 2005 Posts: 24

Kinsman · Joined: 18 Jul 2005 Posts: 15 Location: Canada

Slopey · Joined: 31 Jul 2005 Posts: 24

Doh! I'll go grab it now :)

Slopey · Joined: 31 Jul 2005 Posts: 24

Oh, by the way, does the Lua Player run on the PSP ELF emulator?

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

nevyn · Joined: 31 Jul 2005 Posts: 136 Location: Sweden

nevyn · Joined: 31 Jul 2005 Posts: 136 Location: Sweden

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

After using "print", the graphics library is disabled, because this was used for debug, only, and for error string output, perhaps I should change this to the new text output function.

But the screenshot looks like the text was printed and then the resolution was changed to 16 bit. And I can't see where the "Loading Lowser..." text came from. There was a bug in an older version, which caused to display some messages from kernel, so I registered a null callback first, and only before starting the script the real debug output, but I can't reproduce this with version 0.4. That said, it should work without any "print" :-)

LiquidIce · Joined: 04 Apr 2005 Posts: 55

Shine, Lua is working better than ever. It took a few tweaks of my code to make it compatible with the new player, bu once it was running everything looked smooth. The alpha stuff works great, and I am making a lot of progress with my game. I will release it here soon, but I am having a problem with my loops causing major slowdowns on the PSP.

Keep in mind, I am new to game programing. I wrote this same game in flash a while ago and have been trying to port it to the PSP with Lua.

In my game i keep adding new enemies to a table called enemies. Then on each 'play' cycle i check to see if any bullets intersect any of the enemies by looping through each enemy and checking coordinates with each bullet. The code works, but as more enemies come on to the screen, or if i shoot really fast, the game comes to a crawl.

What is the best way to loop through each item in my enemies table?

I have tried methods like this:

nevyn · Joined: 31 Jul 2005 Posts: 136 Location: Sweden

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

nevyn · Joined: 31 Jul 2005 Posts: 136 Location: Sweden

Lowser v0.1 is done! It's a very simple file browser that can launch lua scripts and "application bundles" (a folder with "index.lua" in it, optionally also an "icon.png"). I'll make the interface better looking when I get time... I have some planned features as well :)

I've bundled it with LuaPlayer 0.4 in the below package:
LuaPlayer v0.4 with Lowser and Snake

Shine, I ran into some Lua-related stuff when writing Lowser:
printText doesn't have the optional imageHandle argument, so I can't render text to an offscreen image... I've made a workaround for it now, but I'd love a fix :)

Soft wrapping in printText would be real nice, too...

Is there a way to deallocate the memory allocated through createImage()?

For some reason alpha transparency in my pngs aren't working all that great. Any ideas?[/url]

Kinsman · Joined: 18 Jul 2005 Posts: 15 Location: Canada

I did some thinking about the freeing and reusing of images, and what would be a good way for both the developers and end-users to make memory management easy. I settled on this.

reloadImage(int imageHandle, string fileName)

Frees the memory of the image previously using the given handle, and loads a new PNG file into that handle.

Example:

tiles = loadImage("level1.png");
-- And later..

tiles = reloadImage("level2.png");

recreateImage(int imageHandle, int width, int height)

Frees the memory of the image previously using the given handle, and creates a new canvas into that handle.

reloadImage and recreateImage can be mixed together - for instance, you can load a PNG file and then use recreateImage to replace it with a blank canvas.

I did a quick test, and don't expect much trouble from these routines:

Kinsman · Joined: 18 Jul 2005 Posts: 15 Location: Canada

I've been working on a way to tint images being displayed to the screen, and I've got a nice blitAlphaImageEx() routine in my personal copy of Lua, but before I release anything, I wanted to ask..

Shine, have you considered converting the Lua Player to handle 32-bit colour?

It'd make a few things easier - the tinting and alpha fading of images, for instance, and it'd make images like smoothed fonts and backgrounds with subtle colours show up better.

A 32-bit image does take twice the memory of a 16-bit image; but if a full-screen 32-bit image takes up 522,240 bytes then we can afford the luxury.

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

dctrvenkman · Joined: 02 Aug 2005 Posts: 4

have you tried updating your toolchain?

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

I've setup a webpage for Lua Player. I hope the screenshots of Lowser and the upcoming game by VgSlag are ok. Write me a PM, if you like a link to your webpage.