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audio: triangle and noise sfx channels

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Adds `channel: triangle` / `channel: noise` to the `sfx` declaration
form. The existing pulse-1 / pulse-2 driver is unchanged (and is
still byte-identical for programs that don't use the new channels)
— when a program declares a triangle or noise sfx the runtime
splices in an additional per-channel slot that writes to $4008-
$400B (triangle) or $400C-$400F (noise) on play. Includes a new
`examples/noise_triangle_sfx.ne` demo with committed golden PNG +
audio hash.

https://claude.ai/code/session_01MaNVcDmK9gsspRkdxowQAM
This commit is contained in:
Claude 2026-04-14 10:42:53 +00:00
parent 8610aecdac
commit 201664ea04
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18 changed files with 1116 additions and 52 deletions
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4
src/linker/mod.rs
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@ -418,8 +418,10 @@ impl Linker {
// `__audio_tick` — so we emit it alongside the math
// routines, well before the NMI handler below.
let has_audio = has_label(user_code, "__audio_used");
let has_noise = has_label(user_code, "__noise_used");
let has_triangle = has_label(user_code, "__triangle_used");
if has_audio {
all_instructions.extend(runtime::gen_audio_tick());
all_instructions.extend(runtime::gen_audio_tick(has_noise, has_triangle));
all_instructions.extend(runtime::gen_period_table());
// Emit one data block per sfx blob: a label followed by
// the envelope bytes. `play Name` codegen emits a