The moment that a few of you have been waiting for - a glimpse at my VHDL - is now here. See the newest code in our git repo: https://github.com/dqydj/VGAtonic/
You'll want to bring that into ISE Webpack and synthesize it. I've been programming my CPLDs using a Bus Pirate; you can see that methodology here.
Look in this directory for all of the demo code and design documents so far: https://github.com/dqydj/VGAtonic/tree/master/First_Draft
The How to Use file details how this protocol works - it's very simple, I promise.
I'll be back soon with firmware for the ATTiny onboard VGAtonic's reference design, along with the client code used in the Youtube demo.