Ideograph by Five Finger Punch & Insane [web]
IDEOGRAPH by Five Finger Punch feat. iNSANE for unexpanded Amiga 500 OCS 512 Kb Released at Datastorm 2017 ----------------------------------------- I started with this demo because Bjoppen/iNSANE kept asking when I would code something for Amiga again. There would not have been a demo without him! I contacted Mygg/iNSANE and asked if he could make music for me. I thought I had finished the demo but, I was wrong! Before long Mygg had dragged Corel/iNSANE and Premium/iNSANE into the project as well. Lots of graphics and three new parts were added. Big thanks to you guys!!! Some short tech about each part for those interested: - intro Shows bitmaps in sync with music and shakes the last bitmap using hardware scroll. Bitmaps are packed using Imodiums packer Punify. I ported the unpacker to 68000 for this demo. The packer is basically a variant of LZ77 aimed at more resource constrained machines like Spectravideo 328 or ZX Spectrum. - zooming and rotating rotozoom Copper chunky rotozoom using a prescaled bitmap for each z. Move it in sync with music using hardware scroll. Z calculations are done using Bresenham style error forwarding; not perspective correct. - metaballs Saturation addition using copper controlled blitter. Basically use the blitter as a half adder on each bitplane. Combine the results and repeat. Textmessages are sprites. Change colors in sync with music. - logo Abusing hardware scroll to zoom horizontally 16px and using modulo to zoom vertically. Simultaneously set up blitter interrupts to scale the bitmap 16px. Then repeat. Zoom calculations are done using Bresenham style error forwarding. This part didn't work when I first tested it on real hardware. The error could not be reproduced in fs-uae, but fortunately in WinUAE. The logo is packed using Punify. - spiral Polygon clipping using the algorithm described in the paper "A new fast method for polygon clipping", Maillot, 1992. I could have just used bitplane pointers and faked it instead. Would have been both faster and easier. I actually coded this back in 1991 using homemade line clipping, but made a completely new implementation for this demo. Vertical white lines are sprites. - simulation Verlet cloth simulation inspired by the paper "Advanced character physics", Jakobsen, 2003. Imodium figured out a way to do the calculations without using square roots. Background is packed using Punify. Balloon and sheeps are sprites. - perspective sinescroll Pixelplotting and xor filling. The vertical lines are sprites. - hand dots Particle system with about 1200 16.16 fixed point dots. The flashing stars at the end are sprites. - heart Just a simple change between two bitmaps. Bitmaps are packed using Punify. - music Music playback using The Player. Sync with effects is done using E8x commands. Morbid / Five Finger Punch @hypp74
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