54 lines
2.0 KiB
Plaintext
54 lines
2.0 KiB
Plaintext
General Note:
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require an Apple IIe with 128k. I don't use any advanced IIe
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effects (no 65c02, no double-graphics modes). I mostly just
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need the 128k of RAM for use as a RAM disk as it's next
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to impossible to load data while music is playing.
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Aside about the Disk II, Woz had an amazing design but it's
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controlled with cycle-accurae assembly bitbanging the hardware
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and is essentially hard real-time. Interrupts or running other
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code while loading likely would make the disk fail. I'm only
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aware of two demos that do this, X by French Touch and
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X by Y. Haven't had a chance to look at what they did.
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Music is using my PT3 player that can play .pt3 tracker files.
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Disk code is by Qkumba. It's super fast. I'm using that with
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raw disk sector reads, there's no filesystem on the disk (no AppleDOS
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or ProDOS).
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Intro
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horizontal scroll, a bit of a pain
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Chessboard
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various ways to do this.
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cheating and using a sprite as didn't have time to hack up
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a 3d-render or else some sort of triangle-drawing code
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re-using existing sprite code, you can see artifacts on edges
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because the code is working at byte-granularity for speed
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but each byte holds 3.5 pixels. One way to fix this is to
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have a separate mask sprite and oring things but that would
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severely reduce the frame rate and take up a lot more space
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Tunnel
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I wasted a week trying to get a good tunnel effect and gave
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up (after some very interesting chunks of buggy code).
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Drawing circles is a pain on 6502. So for this I just
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took 2 screenshots and page flip
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The real effect here is a bit more interesting that a plain
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tunnel as it wiggles the camera around too.
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Interference
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This one is I think just interference between two circles.
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This one I used some existing code I had that was doing something
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vaguely similar with sine waves. I didn't have time to try
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to do the proper effect. Even with table lookups and self-modifying
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code and using lo-res the frame rate isn't high and it would probably
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be worse if I was doing the proper effect. This effect does
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go on forever though.
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