A minimalistic fluxus compatible programmable game engine and 3D renderer for exprimenting with livecoding ARM devices such as Raspberry Pi, OUYA and Android as well as legacy support for PlayStation2.
- Modified tinyscheme R5RS interpreter
- REPL for livecoding
- OSC REPL for remote livecoding
- Fixed point maths throughout
- An experimental vector processor and compiler for fast procedural rendering
- OpenGL ES backend for ARM/Android/Rasperry Pi/OUYA
- Linux target as a reference version (also running fixed point)
- Playstation 2 target (legacy) a custom hardware renderer running on vu1 path
You'll need scons and liblo-dev installed, the Linux version requires GLUT.
scons
scons TARGET=RPI
As part of an APK:
ndk-build
Inside the testing directory there is a python script for testing the OSC mode, continuously sending test code to the jellyfish program - which can be on another machine.
The purpose of a Jellyfish Lisp program is to manipulate 3D objects in a scene, move/rotate/scale or change vertex positions, lighting normals, texture coords. It can also act on input from outside. It can do this faster than in interpreted Scheme, particually on ARM devices as the VM (written in C++) is very small and doesn't require any memory allocation so no garbage collection is required. The VM also has access to more data than a GPU shader, although tight coupling to GPU functionality (ie running parts of the VM on GPU cores) is planned.
Jellyfish Lisp programs are compiled to bytecode executed by the VM - there is one per object potentially running in parallel threads. The helper function (make-jelly-obj) takes a number of cycles to execute per frame, an OpenGL primitive type and a program. It returns the primitive id which can be operated on like any normal fluxus primitive.
Inside the jellyfish VM the 3D data exists in the same memory address space as the program itself, starting at "positions-start" address. Using (read) or (write!) you can access it using a value as an address.
Here is a program that randomly moves vertex positions around:
;; normal fluxus code
(with-primitive
(make-jelly-obj 1000 prim-tristrip
;; jellyfish lisp starts here
'(let ((vertex 0))
(forever
(set! vertex positions-start) ;; start at the first vertex number
(loop (< vertex positions-end) ;; go to the last vertex
(write! vertex (+ (read vertex) (rndvec))) ;; add a random amount
(set! vertex (+ vertex 1))) ;; increment vertex number
)))
;; jellyfish lisp ends here
;; normal fluxus code
(pdata-map! (lambda (p) (srndvec)) "p")
(pdata-map! (lambda (c) (rndvec)) "c"))
Reference for all the commands in jellyfish lisp.
(let ((name value) (name value) ...) block)
Bind names to values. All values are internally vectors of length 3 in
jellyfish (as it's a vector processor), but you can specify them as
single numbers for convenience, which just get converted to
(vector x 0 0) where x is the number you specify.
Tofix: Let bindings are not scoped correctly, variables can be referred to after scope is closed and conflict with function parameters and other let variables of the same name. This is bad.
(define name value)
Assign a name to a value, can be a function or a vector.
Tofix: same scoping problem same as let.
(if pred true-expr false-expr)
An if expression - returns value of the executed expression, eg.:
(define a (if (< (some-func) 10) 100 200))
Will assign a to be 100 or 200.
(when pred do-this-block)
Same as if, without the false else block. Returns the value of the last expression if true, zero otherwise.
(cond (pred block) (pred block) ... (else block))
Internally evaluates to a bunch of if's
(loop pred block)
Repeats until the predicate is false.
(forever block)
Repeats forever
(do block)
Returns the value of the last expression.
(lambda (args) block)
Creates a procedure, more usually:
(define myproc
(lambda (a b)
(+ a b)))
Vector addition and subtraction:
(+ (vector 1 2 3) (vector 2 3 4))
(+ 2 (vector 3 2 1))
Single numbers become (vector number 0 0) so the above lines evaluate to
(vector 3 5 7) and (vector 5 2 1) respectively. Same for subtraction.
Multiplies and divides by the second parameter's x value, so:
(* (vector 1 1 1) 2) => (vector 2 2 2)
and
(/ (vector 1 1 1) 2) => (vector 0.5 0.5 0.5)
Multiplies by each element, eg:
(*v (vector 1 2 3) (vector 0.5 4 3)) => (vector 0.5 8 9)
Cross product and dot product of two vectors
Per-element equality
Compares x values of supplied vectors. Tofix: why no <= or >=?
(set! name newvalue)
Mutates value of an existing variable.
- write-add!
- swizzle
- rndvec
- trace
- read
- not
- mag
- magsq
- noise
- normalise
- abs
- floor
- sincos
- ignore
- round
- synth-create
- synth-connect
- synth-play
- play-now
Soon...
jmp jmz jlt jgt ldl lda ldi sta sti add sub mul div abs scs atn dot crs sqr len dup drp cmp shf bld ret dbg nrm mst mad msb swp rnd mull jmr ldlv lensq noise lds sts mulv synth-crt synth-con synth-ply flr
LICENSE TERMS
Copyright (c) 2000, Dimitrios Souflis All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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