nx_solarsim.nx

buildroot/runtime/nx_solarsim.nx

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about

nx_solarsim.nx -- Simulates the solar system with integer-based N-body physics, rendering planets and trails in a packed RGB framebuffer.

dependencies 0 imports · 1 importers

imports: none

imported by: nx_solarsim_gate.nx

structs

none

consts

2	const O_MAGIC_38700: i64 = 38700
3	const O_MAGIC_72300: i64 = 72300
4	const O_MAGIC_100000: i64 = 100000
5	const O_MAGIC_152400: i64 = 152400
6	const O_MAGIC_520300: i64 = 520300
7	const O_MAGIC_4096: i64 = 4096
19	const W: i64 = 256
20	const H: i64 = 256
21	const O_FB: i64 = 0 // framebuffer WH i64 packed-RGB at offset 0 (WH*8 = 524288 bytes)
22	const N: i64 = 5 // planets: Mercury, Venus, Earth, Mars, Jupiter
23	const O_X: i64 = 524288 // x[N] (true coords, AU*SC)
24	const O_Y: i64 = 524328 // y[N]
25	const O_VSX: i64 = 524368 // vsx[N] (velocity * VS)
26	const O_VSY: i64 = 524408 // vsy[N]
27	const O_R0: i64 = 524448 // r0[N] initial radius (for display scale + period)
28	const O_RPX: i64 = 524488 // rpx[N] display radius in pixels
29	const O_TH: i64 = 524528 // trail head[N]
30	const O_TC: i64 = 524568 // trail count[N]
31	const O_STEP: i64 = 524608 // [0] global step counter
32	const O_TR: i64 = 524616 // trails: NTRAILN points 2 i64 (px,py)
33	const TRAILN: i64 = 80
34	const SC: i64 = 100000 // 1 AU = 100000 units
35	const GM: i64 = 15625000000000 // (SC/8)^2 * SC -> circular speed SC/8 at r=SC (Earth period ~3222 steps)
36	const DD2: i64 = 8192 // position-step divisor (= 2DD, D=64)
37	const VS: i64 = 128 // velocity scale (= 2*D, exact symplectic half-kick)
38	const CX: i64 = 128
39	const CY: i64 = 128
40	const STEPS_PER_TICK: i64 = 24

functions

42	func rgb(r: i64, g: i64, b: i64) -> i64 { return (r & 255) \| ((g & 255) << 8) \| ((b & 255) << 16) } called by 3: color_of dim render_impl
43	func isqrt(N0: i64) -> i64 { if N0<2 { return N0 } var x: i64=N0; var y: i64=(x+1)/2; while y<x { x=y; y=(x + N0/x)/2 } return x } called by 4: energy_p set_planet step_one_impl main
44	func color_of(p: i64) -> i64 called by 1: render_impl calls 1: rgb
51	func dim(c: i64) -> i64 { return rgb((c&255)2/5, ((c>>8)&255)2/5, ((c>>16)&255)*2/5) } called by 1: render_impl calls 1: rgb
52	func radius_of(p: i64) -> i64 { if p==4 { return 4 } return 2 } // Jupiter a touch bigger called by 1: render_impl
54	func putpx(base: i64, px: i64, py: i64, c: i64) -> i64 called by 2: disc render_impl
58	func disc(base: i64, px: i64, py: i64, r: i64, c: i64) -> i64 called by 1: render_impl calls 1: putpx
65	func clear_fb(base: i64, c: i64) -> i64 { let fb: i64=(base+O_FB) as i64; var i: i64=0; while i<W*H { fb[i]=c; i=i+1 } return 0 } called by 1: render_impl
68	func energy_p(base: i64, p: i64) -> i64 called by 1: main calls 1: isqrt
74	func set_planet(base: i64, p: i64, a: i64) -> i64 called by 1: init_impl calls 1: isqrt
83	func init_impl(base: i64) -> i64 called by 4: tick_impl init measure_period main calls 1: set_planet
94	func step_one_impl(base: i64, p: i64) -> i64 called by 2: tick_impl measure_period calls 1: isqrt
107	func record_trail(base: i64, p: i64) -> i64 called by 1: tick_impl
116	func tick_impl(base: i64, cmd: i64) -> i64 called by 2: tick main calls 3: init_impl step_one_impl record_trail
127	func render_impl(base: i64) -> i64 called by 2: render main calls 7: clear_fb rgb disc dim color_of putpx+1
145	func ww() -> i64 { return W } called by 1: main
146	func hh() -> i64 { return H } called by 1: main
147	func fb_off() -> i64 { return O_FB } called by 1: main
148	func init() -> i64 { return init_impl(0) } calls 1: init_impl
149	func tick(cmd: i64) -> i64 { return tick_impl(0, cmd) } calls 1: tick_impl
150	func render() -> i64 { return render_impl(0) } calls 1: render_impl
151	func mem_bytes() -> i64 { return O_TR + NTRAILN2*8 + O_MAGIC_4096 }