This ports id Software's Quake to run on the SDL plugin runtime. The
source code originated from id under the GPLv2 license. I used
https://github.com/ahefner/sdlquake as the base of my port.

Performance is, unsurprisingly, not on par with what you're probably
used to on PC. I average about 10FPS on ipod6g, but it's still
playable.

Sound works well enough, but in-game music is not supported. I've
written ARM assembly routines for the inner sound loop. Make sure you
turn the "brightness" all the way down, or colors will look funky.

To run, extract Quake's data files to /.rockbox/quake. Have fun!

Change-Id: I4285036e967d7f0722802d43cf2096c808ca5799

Prevents system SDL from interfering with thread driver selection. Also
adds test code for alignment faults.

Change-Id: I8bc181922c4a9e764429897dbbaa1ffaabd01126

The simulator build will pull in the host SDL headers, which we can't
filter out easily. A simple workaround is to simply remove the pthread
include from our SDL.

Change-Id: I09de0f2e85b891aa88958e21426ab450af516e76

We never use any of these other drivers, so having them around just takes
up space.

Change-Id: Iced812162df1fef3fd55522b7e700acb6c3bcd41

Change-Id: Ieb33d3fec1e0d834c5e294b79f280959497acb6a

Using the coprocessor was a good idea in theory, but didn't actually work.
This moves all SDL threads to the main core, which isn't ideal, but at
least works. Additionally, this also adds some good-practice stuff such as
setting the default sample rate on exit.

Change-Id: If1636b33d439000ec7c4e50f46e8d002708d3121

This ports Fabien Sanglard's Chocolate Duke to run on a version of SDL
for Rockbox.

Change-Id: I8f2c4c78af19de10c1633ed7bb7a997b43256dd9