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- genome(seed, salts) now has three parts with their own RNG streams: shared (steps, form, swing, arc, layback, fill odds, phase offset), kit (density, frame, accent cycle, free snare) and keys (scale/root, progression, motif, hocket, bass tone, note lengths, range). ROLL KEYS now renews the harmony too; ROLL KIT leaves the keys alone. - Keys generators share one signature and can fix note lengths: MOTIF (the old line), 303 (acid bass, answers in the rests, drone or silent pad), TURING (8/16-bit shift register, DRIFT flips bits, 16-bar window), ARP (triad/7th arpeggio, roots on kicks). - Pages: KIT GEN, KEYS GEN; ROLL shows KIT / KEYS; slots keep both gens. - Flash record v3 (old settings ignored). Bring-up golden checksums updated. - C port matches; host test and ASan/UBSan pass. Intended music change: every seed sounds different (genome split, new generators). Vectors regenerated with npm run vectors; the case grid now crosses all kit and keys generators, with TURING runs past its window. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
71 lines
2.9 KiB
C
71 lines
2.9 KiB
C
/* Seedbox engine: C port of sim/engine.js. Portable C99, no SDK, no allocation, integer-only.
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sim/engine.js is the reference; this file must reproduce test/vectors bit for bit.
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Not reentrant: render from one core only (scratch buffers are static). */
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#ifndef SEEDBOX_ENGINE_H
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#define SEEDBOX_ENGINE_H
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#include <stdint.h>
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#define SB_TPB 840 /* ticks per quarter */
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#define SB_TPS 210 /* ticks per 16th */
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#define SB_CLOCK_TICKS 35 /* MIDI clock every 35 ticks */
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#define SB_PHRASE_BARS 4
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#define SB_NT 11 /* tracks */
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#define SB_NSCALES 21
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#define SB_MAX_EVENTS 128 /* per bar and per scratch list; the vectors peak at 54 */
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enum { SB_T_KICK, SB_T_KICK2, SB_T_SNARE, SB_T_GHOST, SB_T_HAT, SB_T_HAT16, SB_T_PERC,
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SB_T_BASS, SB_T_MELA, SB_T_MELB, SB_T_PAD };
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enum { SB_GEN_EUCLID, SB_GEN_SKELETON, SB_GEN_SUBDIV, SB_GEN_AUTOMATA, SB_GEN_AMENIZER, SB_NGEN };
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enum { SB_KEYS_MOTIF, SB_KEYS_303, SB_KEYS_TURING, SB_KEYS_ARP, SB_NKEYS };
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/* hash and RNG */
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uint32_t sb_mix(uint32_t a, uint32_t b);
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typedef struct { uint32_t s; } sb_rng;
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void sb_rng_init(sb_rng *r, uint32_t seed);
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uint32_t sb_rng_next(sb_rng *r);
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int sb_rng_below(sb_rng *r, int n);
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int sb_rng_chance(sb_rng *r, int p);
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/* genome: field names follow engine.js */
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typedef struct {
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int steps;
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int form_idx; /* index into FORMS; form[] is a copy */
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int form[4];
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int scale, root;
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int dens[2];
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int fillP, monoLen, monoRange, rot, hocket, bassDeg;
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int prog_idx; /* index into PROGS; prog[] is a copy */
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int prog[4];
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int swing, arc, motifLen, accentCycle, layback, frame, freeK, freeRot;
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} sb_genome;
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typedef struct { uint32_t seed; uint32_t salts[2]; } sb_state;
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/* shared part from the seed; kit and keys parts also take their salt (ROLL KIT / ROLL KEYS) */
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void sb_genome_make(const sb_state *st, sb_genome *g);
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const char *sb_form_name(int form_idx);
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typedef struct { int gen, keys, energy, drift, fill, scale, root; } sb_params; /* scale, root: -1 = AUTO (the seed picks) */
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/* one output row: [t, lane, v, vel, len, tr] */
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typedef struct { int16_t t, len; uint8_t lane, v, vel, tr; } sb_event;
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typedef struct {
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int bar, pos, phrase, sec, fill, variants[2], barTicks, steps;
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int overflow; /* nonzero if any list hit SB_MAX_EVENTS (should never happen) */
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int n;
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sb_event ev[SB_MAX_EVENTS];
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} sb_bar;
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/* ROOT / SCALE pages: overrides the genome's scale and root when they're >= 0 (app.js applyKey). */
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void sb_apply_key(sb_genome *g, const sb_params *p);
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const char *sb_scale_name(int scale);
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const char *sb_keys_name(int keys); /* MOTIF, 303, TURING, ARP */ /* screen name, at most 10 characters */
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void sb_render_bar(const sb_state *st, const sb_params *p, int bar, sb_bar *out);
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/* FNV-1a over rows, each field & 0xFFFF. Feed a whole case's events in order, starting from SB_FNV_INIT. */
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#define SB_FNV_INIT 0x811C9DC5u
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uint32_t sb_checksum_event(uint32_t h, const sb_event *e);
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#endif
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