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47 lines
2.6 KiB
Text
47 lines
2.6 KiB
Text
QBDEMO (C) 2002 Tor Myklebust
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The fractal zoomer should run at 60FPS on a 500MHz machine. I disabled
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vsync because it runs like shit on this 300MHz machine on the higher zoom
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levels (inconsistent 20-30 fps). I basically just packed the rest of the
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demo with really shitty effects. There is no music because I don't know
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a damn thing about sound coding (aside from the fact that you use Fourier
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transforms a hell of a lot), and I also don't know the first thing about
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art/music.
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The fractal zoomer uses a number of cheap hacks. First, I only render
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the fractal image once per 50 frames. It zooms in by a factor of two
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each time. It is rendered at a resolution of 320*200, because we don't
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want blockies to show up on our 160*100 rendered image. I've tried
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doing the "maximal" 224*141 (or thereabouts) image and it looked bad.
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We render four scanlines per frame, drawing as few pixels as possible.
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We zoom the 160*100 in the middle of the previous frame's 320*200 to take
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up every fourth pixel in the new frame, then (ab)using the intermediate
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value theorem for the pixels in between if the neighbour pixels are the
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same colour. This causes some minor visual artefacts which you shouldn't
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be able to see (except the one white line where the yellow is disappearing)
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This code is VERY LOOSELY based on Alex Champandard's code in his "The Art
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of Demomaking" series. I made up the zoom hack and the IVT hack because
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QB is more than twice as slow as DJGPP. I thought his palette-cycling
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looked really stupid, so I omitted that.
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I shouldn't need to explain the shadebob effect. Everyone knows how to do
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shadebobs, or can at least figure it out in two or three minutes. No
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hacking was necessary here, as the effect is trivial to begin with.
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I also shouldn't need to explain plasma. No hacking was involved here,
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either.
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I did the flag thing because I saw an american flag flying in some past demo
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which i just looked at (15 minutes before the deadline). I didn't have time
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to code an american flag burning (I've done this in C by just rendering less
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and less of the flag (having the fire "crawl across" the flag) each frame,
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and using the "burning" areas to seed a fire. Besides, burning is supposed
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to be a proper way to retire a flag, and we can't have that.
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I wanted to add a (phongshaded, swept) scrolltext, but time did not permit
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it. You can see something like this in mesha or lbd or something (however,
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because QB is QB, it probably wouldn't be half the quality).
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I started this 27 hours before the deadline, and finished it _on_ the
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deadline. Yay for me.
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