2013-11-30 Doom Demo

Not too much time to investigate things today, but I thought I'd briefly look into the problem with the demo not playing in Doom.

Turns out the demo was for version 1.09 and the game is version 1.10.  Also turns out if you callously comment out the version check and pretend it's all ok, it works  :)

The frame rate is currently about 0.9 frames per second, but almost all of that time is my video routine drawing the 24-bit bitmap to the screen, plenty of room for improvement.  I'll probably make a video benchmarking function to maybe count the time it takes to render 50 frames so that I can clearly test each modification I make.  Maybe over Christmas ...