Cordic demo 1k - The Oxygene Ring Odyssey by SinDiKat [web]
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:: Cordic demo 1k - The Oxygene Ring Odyssey ::
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Set of simple color effects based on color
rings controlled by note pitch from the music
Multicolor graphics mode (160x200) is used
Code: Busy soft
Music: Noro soft
Create: 10.02.2026
Release: FOReVER:2026
Original music: Oxygene IV
Composed by: Jean Michel Jarre
The processed concentric rings are drawed by using
simplified CORDIC algoritm for computing vector size:
Vector_size = SQR(X^2+Y^2)
Input: varxxx = coordinate X where X >= Y
varyyy = coordinate Y where Y > 0
lda varxxx
L1: sec
sbc varyyy
bcs L2
inc varxxx
adc varyyy
L2: dec varyyy
bne L1
Output: varxxx = distance = SQR(X^2+Y^2)
varxxx,varyyy can be variables in zero page.
See older Cordic demos 8 to 256 bytes
for more math theory and how it works.
Intro is packed by using LzxPack02
Used compression: -tn31c4o6
Unpacked length: 1085 bytes
Packed length: 885 bytes
Lzx depacker: 118 bytes
Big thanx to Loki for porting Lzx depacker to 6502 ![ back to the prod ]