From 79cb6caee1513c6b70a1f2201b73c222af3ec007 Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Tue, 10 Mar 2020 10:15:01 -0500
Subject: plots *a waveform*, not timed correctly

---
 src/audio.rs | 15 +++++++++++++--
 src/main.rs  |  8 ++++----
 src/tom.rs   | 61 ++++++++++++++++++++++++++++++------------------------------
 3 files changed, 47 insertions(+), 37 deletions(-)

(limited to 'src')

diff --git a/src/audio.rs b/src/audio.rs
index ac6bc12..e51504b 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -4,24 +4,35 @@ use std::fs::File;
 
 use crate::constants;
 
-pub fn init() -> StreamingSource {
+pub fn init() -> (StreamingSource, Vec<i16>) {
     let mut source = OggStreamReader::new(File::open("data/djbLUETOOTH.ogg").unwrap()).unwrap();
     let alto = Alto::load_default().unwrap();
     let device = alto.open(None).unwrap();
     let audio_context = device.new_context(None).unwrap();
     let mut stream = audio_context.new_streaming_source().unwrap();
     let sample_rate = source.ident_hdr.audio_sample_rate as i32;
+    let sample_channels =
+        source.ident_hdr.audio_channels as f32 * source.ident_hdr.audio_sample_rate as f32;
+
+    let mut toms_samples = Vec::new();
+
+    let mut _track_length = 0.0;
 
     while let Ok(Some(mut samples)) = source.read_dec_packet_itl() {
         samples = samples
             .into_iter()
             .map(|s| (s as f32 * constants::VOLUME) as i16)
             .collect();
+        _track_length += samples.len() as f32 / sample_channels;
         let audio_buffer = audio_context
             .new_buffer::<Stereo<i16>, _>(&samples, sample_rate)
             .unwrap();
         stream.queue_buffer(audio_buffer).unwrap();
+
+        if samples.len() > 1 {
+            toms_samples.push(samples[0])
+        }
     }
 
-    stream
+    (stream, toms_samples)
 }
diff --git a/src/main.rs b/src/main.rs
index d81d45c..8651f56 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,8 @@
-pub mod constants;
 pub mod audio;
-pub mod vertex;
+pub mod constants;
 pub mod n1ck;
 pub mod tom;
+pub mod vertex;
 
 use alto::Source;
 use luminance::context::GraphicsContext;
@@ -61,10 +61,10 @@ fn main() {
             .unwrap()
             .ignore_warnings();
 
-    let mut stream = audio::init();
+    let (mut stream, toms_samples) = audio::init();
     stream.play();
 
-    let mut tom = Tom::new();
+    let mut tom = Tom::new(toms_samples);
     let mut n1ck = N1ck::new();
 
     let viewports = gen_viewports();
diff --git a/src/tom.rs b/src/tom.rs
index b899b08..a8fd4a4 100644
--- a/src/tom.rs
+++ b/src/tom.rs
@@ -1,5 +1,3 @@
-use std::f32::consts::PI;
-
 use luminance::context::GraphicsContext;
 use luminance::framebuffer::Framebuffer;
 use luminance::pipeline::PipelineState;
@@ -55,50 +53,30 @@ fn relative(x: f32, in_min: f32, in_max: f32, out_min: f32, out_max: f32) -> f32
     (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min
 }
 
-fn gen_sin(start: f32) -> Vec<Vertex> {
-    let mut vertices: Vec<Vertex> = Vec::new();
-
-    let end = start + (2.0 * PI);
-    let mut x = start;
-    while x < end {
-        vertices.push(Vertex {
-            position: VertexPosition::new([relative(x, start, end, -0.9, 0.9), x.sin() * 0.9]),
-            color: VertexRGB::new(constants::C64_GREEN),
-        });
-
-        x += 0.4;
-    }
-
-    vertices
-}
-
 #[derive(Default)]
 pub struct Tom {
     border: Vec<Vec<Vertex>>,
     wave: Vec<Vertex>,
-    last_input: f32,
+    last_x: usize,
+    samples: Vec<i16>,
     tessalations: Vec<Tess>,
 }
 
 impl Tom {
-    pub fn new() -> Tom {
-        let border = gen_border();
-        let wave = gen_sin(0.0);
-        let tessalations = Vec::new();
-
+    pub fn new(samples: Vec<i16>) -> Tom {
         Tom {
-            border,
-            wave,
-            last_input: 0.0,
-            tessalations,
+            samples,
+            border: gen_border(),
+            wave: Vec::new(),
+            last_x: 0,
+            tessalations: Vec::new(),
         }
     }
 
     pub fn update<T: GraphicsContext>(&mut self, mut surface: T) -> T {
         self.tessalations.clear();
 
-        self.last_input += 0.1;
-        self.wave = gen_sin(self.last_input);
+        self.update_wave();
 
         for vertices in self.border.iter() {
             self.tessalations.push(
@@ -144,4 +122,25 @@ impl Tom {
 
         surface
     }
+
+    fn update_wave(&mut self) {
+        self.wave.clear();
+
+        let start = self.last_x;
+        let end = start + 10;
+
+        let max_y = 200.0;
+        let min_y = -200.0;
+        for x in start..end {
+            self.wave.push(Vertex {
+                position: VertexPosition::new([
+                    relative(x as f32, start as f32, end as f32, -0.9, 0.9),
+                    relative(self.samples[x] as f32, min_y, max_y, -0.9, 0.9),
+                ]),
+                color: VertexRGB::new(constants::C64_GREEN),
+            });
+        }
+
+        self.last_x += 1;
+    }
 }
-- 
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