Continuing in my quest to optimise my RISC OS port of NBlood, I've recently been taking a look at the rendering code. Specifically, the top functions in my profiler's output: the vertical line drawing routines, which are used to draw walls and sprite-based entities.
 
 

Welcome to the first in a (very) infrequent series of articles about optimisation. In this article I'll be looking at audio mixing in C/C++ using GCC 4.7.4, running benchmarks of various routines and optimisations across multiple machines in order to work out what works well and what doesn't.
 
 

As mentioned at the end of part one, this article about creating PackMan packages is going to look at what's necessary to generate distribution index files, ROOL pointer files, and how these tasks can be automated. Towards the end I'll also be taking a look at some options for automating the uploading of the files to your website.
 
 

For this first article looking at how to create PackMan/RiscPkg packages, I've decided to use my SunEd program as a guinea pig. Being a simple C application with no dependencies on other packages, it'll be one of the most straightforward things on my site to get working, and one of the easiest for other people to understand.
 
Read on to discover how to turn simple apps like SunEd into RiscPkg packages, and more importantly, how to automate the process.
 
 

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.
 
 

A bit later than I was hoping, but nevertheless it's now time for Building the Dream 2. This time I'll be looking at the RISC OS sound system - everything from the terminology used, to what makes a sound, how the RISC OS sound system works, and how you can write your own sample player.
 
 

Hello and welcome to the Building the Dream, a new series of (regular!) articles at The Icon Bar in which I will be educating you in how to turn your programming dreams into reality. First off, let's get one thing clear - this isn't a beginner's course to programming, or a tutorial in a specific language. Instead it's the place to go once you've finished your programming tutorial and are wondering what to do next. If you have an idea for a program, but are confused about how to implement it, then this is the series for you, as I'll be covering everything from data structures and program design through to project management, optimisation, how to make sure your programs maintain the RISC OS look and feel, and even provide case studies of how certain well-known programs do their stuff.