From 696ab0aadc346f1046f35419a558c291097c521f Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Sat, 22 Nov 2025 00:12:34 -0500
Subject: audio: add temp changing

---
 graphics/src/audio/data.rs         | 8 +++++---
 graphics/src/audio/mod.rs          | 4 +++-
 graphics/src/audio/parse/lex.rs    | 7 +++++--
 graphics/src/audio/parse/parser.rs | 4 ++++
 graphics/src/audio/program.rs      | 8 ++++++--
 5 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/graphics/src/audio/data.rs b/graphics/src/audio/data.rs
index 8cbdf45..5011758 100644
--- a/graphics/src/audio/data.rs
+++ b/graphics/src/audio/data.rs
@@ -3,13 +3,14 @@ use crate::audio::{parse, program::Program};
 const MELODY: &str = r#"
 ; setup
 a v100 d50
+o120
 
 %define notes
 a p$1 v100 - a v0 -
 a p$1 v100 - a v0 -
 a pd4 v100 -- a v0 --
 a pa4 v100 -- a v0 -- --
-a pg3s v100 - a v0 - --
+a pg3# v100 - a v0 - --
 a pg3 v100 - a v0 - --
 a pf3 v100 --- a v0 -
 a pd3 v100 - a v0 -
@@ -20,12 +21,12 @@ a pg3 v100 - a v0 -
 notes d3
 notes c3
 notes b3
-notes b3f
+notes b3b
 
 notes d3
 notes c3
 notes b3
-notes b3f
+notes b3b
 "#;
 
 const BASE: &str = r#"
@@ -33,6 +34,7 @@ const BASE: &str = r#"
 
 ; setup
 b v100 d50
+o120
 
 %define notes
 b p$1 v100 -- b v0 --
diff --git a/graphics/src/audio/mod.rs b/graphics/src/audio/mod.rs
index 473c05b..a8c24ad 100644
--- a/graphics/src/audio/mod.rs
+++ b/graphics/src/audio/mod.rs
@@ -12,7 +12,9 @@ mod data;
 mod parse;
 mod program;
 
-pub const TIME_SLICE: Duration = Duration::from_millis(1000 / 60);
+const AUDIO_FPS: u32 = 60;
+
+pub const TIME_SLICE: Duration = Duration::from_millis(1000 / AUDIO_FPS as u64);
 
 /// Holds each audio channel
 pub struct Channels {
diff --git a/graphics/src/audio/parse/lex.rs b/graphics/src/audio/parse/lex.rs
index f2500da..a349c53 100644
--- a/graphics/src/audio/parse/lex.rs
+++ b/graphics/src/audio/parse/lex.rs
@@ -13,6 +13,7 @@ pub enum Token {
 	LineSeparator,
 	Pause(usize),
 	Jump(usize),
+	Tempo(u32),
 	ChanSpec(ChanSpec),
 	SetVolume(u8),
 	SetPitch(u8),
@@ -96,11 +97,11 @@ impl<'s> Lexer<'s> {
 		}?;
 
 		let off = match self.peek()? {
-			's' => {
+			'#' => {
 				self.next()?;
 				1
 			}
-			'f' => {
+			'b' => {
 				self.next()?;
 				-1
 			}
@@ -178,6 +179,8 @@ impl<'s> Lexer<'s> {
 			'-' => self.next_pause()?,
 			// jump
 			'j' => T::Jump(self.next_int()?),
+			// tempO
+			'o' => T::Tempo(self.next_int()?),
 			// eof
 			'\0' => T::Eof,
 			// new line
diff --git a/graphics/src/audio/parse/parser.rs b/graphics/src/audio/parse/parser.rs
index fbe5f4c..23ba8a4 100644
--- a/graphics/src/audio/parse/parser.rs
+++ b/graphics/src/audio/parse/parser.rs
@@ -87,6 +87,10 @@ impl<'s> Parser<'s> {
 					self.next()?;
 					prog.push(Instruction::Jump(pc));
 				}
+				Token::Tempo(tempo) => {
+					self.next()?;
+					prog.push(Instruction::Tempo(tempo));
+				}
 				_ => self.parse_line(&mut prog)?,
 			}
 		}
diff --git a/graphics/src/audio/program.rs b/graphics/src/audio/program.rs
index f31be06..91f0608 100644
--- a/graphics/src/audio/program.rs
+++ b/graphics/src/audio/program.rs
@@ -1,5 +1,5 @@
 use crate::audio::{
-	Channels,
+	AUDIO_FPS, Channels,
 	channel::{Channel, DutyCycle},
 	parse,
 };
@@ -16,6 +16,7 @@ pub enum ChanSpec {
 pub enum Instruction {
 	Pause,
 	Jump(usize),
+	Tempo(u32),
 	SetVolume(ChanSpec, u8),
 	SetPitch(ChanSpec, u8),
 	SetPulseDutyA(DutyCycle),
@@ -98,11 +99,14 @@ impl Program {
 		match ins {
 			I::Pause => {
 				// pause execution until next `exec` call
-				self.pause = self.tempo / 60;
+				self.pause = (AUDIO_FPS * 4) / self.tempo.clamp(1, 240);
 			}
 			I::Jump(pc) => {
 				self.pc = pc;
 			}
+			I::Tempo(tempo) => {
+				self.tempo = tempo;
+			}
 			I::SetVolume(chan_spec, volume) => {
 				// set the volume (amplitude) on a given channel
 				use ChanSpec as C;
-- 
cgit v1.2.3-freya