Linux_4k_Intro_Coding_asm06.pdf

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Linux 4k Intro Coding

Aug 3 2006

Markku “Marq” Reunanen

Contents

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Overview

Choosing the language

Dealing with GCC

Dynamic library loading

Music generation

Compression

Code level tricks

Useful tools and some pointers

Overview

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Linux 4k intros have been around a few years

–

Suitable platform because of good tools, useful

libraries and minimal executable overhead

●

By knowing the tricks of the trade you can spend

the precious 4096 for the actual content

–

You can save hundreds of bytes with a little extra work

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The methods presented here are based on the three

4k intros by me and Antti “NF” Silvast

–

Yellow Rose of Texas (Asm'03)

Je Regrette (Asm'04)

Make It 4k (Asm'05)

Choosing the language (1)

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Asm

–

You know what you're doing. No overhead but error

prone and not easy to try out or tweak stuff.

More overhead but still suitably small. Less painful

than pure asm :)

Too much overhead for a 4k. Painful name mangling.

For example Perl is pretty much available everywhere.

No interface to gfx/music but potential for scripting.

Shader asm & GLSL

●

–

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C++

–

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Others

–

Choosing the language (2)

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Our approach: combined C and asm

System level code, soft synth and startup in asm

–

These need to be written only once

As small as it gets

Easy to code and portable

We were able to release Linux/Win/OSX/SGI versions

in less than a week

●

Effect code in C

–

●

There's still some overhead in using C but that's

the penalty of being lazy

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