A while ago you may remember that I wrote an article about video conversion for RISC OS, and near the end raised the topic of video conversion on RISC OS using a port of ffmpeg. Although the version of ffmpeg I originally tried on RISC OS was old and broken, Christopher Martin obviously thinks there's some merit to this approach, as he has recently produced !FFmpeg, a working port of ffmpeg for RISC OS.
 
Once more in the interests of SCIENCE, I threw a few test videos at !FFmpeg and measured its performance against that of a similar version of ffmpeg running on my Windows PC.

 

As stated in the last article, this time I'll be looking at what went into the MK I map generator for my eternally work-in-progress game, DeathDawn.
 
Specifically, I'll be looking at the implementation and evolution of the following components of the generator:

• City block placement. This is arguably the most important stage as it defines the overall layout of the city.
• Edge and node linking. A housekeeping stage that prepares the data structures for the road weighting stage.
• Road weighting. A city with roads which all have the same number of lanes isn't very realistic, so this stage uses an algorithm to determine the number of lanes each road should have.
• Road and building painting. With the city structure generated, all that's left is to translate it into the format used by the engine during actual gameplay.

 

After writing my first article about random map generators, I said I was going to write a city generator. Well now I have, and I'm here to tell you about it over the course of the next few Building the Dream articles.

Blow your own trumpet much?

Although this article could just be dismissed as me blowing my own trumpet, I'm hoping that it will serve a somewhat more useful purpose. Before, during, and after working on the map generator I've searched the Internet for examples of similar generators and failed to find any. Sure, there are odd bits and pieces - descriptions of simpler generators that have given me ideas on some techniques to use, or screenshots of sexy work-in-progress realtime generators, but no actual algorithms or code samples from generators that come close to the required complexity of my generator.
 
So hopefully this article will become a useful reference point for anyone else wanting to undertake the task of writing a city generator, whether they're targeting a grid-based world representation like mine or a vector-based one.
 
Apart from discussing the algorithms used in the generator (and why they're used) I'll also talk about the data structures that are used - so even if you're not interested in random map generators you should be able to find plenty of examples of uses for the data structures covered in the first Building the Dream article, as requested quite some time ago.
 
 

 

Parmesan is a new client for the popular MSN Messenger network, developed by Christian Ludlam. Released as freeware, the software brings new features to instant messaging on RISC OS. Chief among these are display pictures and nudges. The software also doubles as a versatile viewer for arbitrary XML files.

RISC OS has seen the release of several MSN Messenger clients over the years; two free clients (Natter and Messenger) and R-Comp's commercial product, Grapevine. A few years ago all of these clients fell foul of an upgrade to the MSN protocol which stopped RISC OS users from being able to connect to the chat network. To many users' dismay, RISC OS was left without a free MSN Messenger client, as only Grapevine was upgraded to support the new protocol.

Happily, this distressing situation has, at last, been rectified with the release of Parmesan. In this article I'll take a look at Parmesan describe my experience of it. Finally, as a Grapevine owner, I will compare Parmesan with the commercial Grapevine application.

 

Hugh Robinson has contacted us to let us know that he's converted classic Acorn platformer Asylum to C, using the SDL library. With full support of original author Andy Southgate, Hugh's source code has now been released under the GPL, and is available to download from the SVN repository on the SourceForge project page.
 
Although a quick look at the source suggests to me that it's fully converted, there are still some bugs and compatability issues to sort out, so feel free to send any fixes Hugh's way if you manage to get the game running. Although the source to Asylum has been available on asylum.acornarcade.com for a few years now, this is the first known port of it to any other platform (and could potentially form the basis of a back-port to RISC OS, to produce a fully 32bit compatible version).
 

What a day - the Wakefield RISC OS show AND Doctor Who. It doesn't get more exciting than that. Here's my report.
 

"VirtualAcorn are delighted to announce that as part of our beta product testing scheme a limited number of VirtualRPC-AdjustSA products suitable for use on G4 and G5 PowerPC Apple Macintosh computers are now available."
 
http://www.virtualacorn.co.uk/products/vrpcadsamac.htm