@import url("/assets/md.css")feat: Marquee, Lower dither opacity at top, DVD Logo should be separate function, Release Builds should work, advance_width should be f64 to save bytes, Vendor Micromod-RS, Add Timing Steps

@import url("/assets/md.css")

9 files changed, 1081 insertions, 125 deletions

diff --git a/src/font.rs b/src/font.rs
index 1dddd20..7041634 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -1,5 +1,3 @@
-use std::sync::LazyLock;
-
 use sdl2::{
   pixels::{Color, PixelFormatEnum},
   rect::{Point, Rect},
@@ -17,8 +15,8 @@ pub struct RenderableCharacter {
   pub data: &'static [u8],
   /** The offset to draw the character at */
   pub offset: Point,
-  /** The amount to advance the x position of the cursor when drawing */
-  pub advance_width: f32,
+  /** The amount to advance the x position of the cursor when drawing - f64 due to internally being used as a f64, despite being stored as f32 (only f64 to save some cpu cycles converting f32->f64) */
+  pub advance_width: f64,
 }
 /**
  A trait describing a generated font.
@@ -34,9 +32,9 @@ pub trait BakedFont {
     let width = u16::from_le_bytes(bytes[0..2].try_into().unwrap());
     let offset_x = i32::from_le_bytes(bytes[2..6].try_into().unwrap());
     let offset_y = i32::from_le_bytes(bytes[6..10].try_into().unwrap());
-    let advance_width = f32::from_le_bytes(bytes[10..14].try_into().unwrap());
+    let advance_width = f64::from(f32::from_le_bytes(bytes[10..14].try_into().unwrap()));
     let data = &bytes[14..];
-    let height = if data.len() == 0 {
+    let height = if data.is_empty() {
       0
     } else {
       data.len() as u16 / width
diff --git a/src/interpolation.rs b/src/interpolation.rs
index ecb2c85..448ef43 100644
--- a/src/interpolation.rs
+++ b/src/interpolation.rs
@@ -90,7 +90,7 @@ impl<ValueType: Copy> AnimationTrack<ValueType> {
   }
   fn get_first_last(&self) -> Option<(KeyFrame<ValueType>, KeyFrame<ValueType>)> {
     let okf = self.get_sorted_keyframes();
-    if okf.len() == 0 {
+    if okf.is_empty() {
       None
     } else {
       Some((*okf.first().unwrap(), *okf.last().unwrap()))
@@ -175,14 +175,11 @@ impl<
     timing_function: TwoValueTimingFunction,
   ) -> Option<ValueType> {
     let frames = self.get_current_keyframes(sorted_keyframes, time);
-    match frames {
-      Some(frames) => Some(KeyFrame::raw_value_at(
+    frames.map(|frames| KeyFrame::raw_value_at(
         &frames.0,
         &frames.1,
         time,
         timing_function,
-      )),
-      None => None,
-    }
+      ))
   }
 }
diff --git a/src/main.rs b/src/main.rs
index 9c65333..7ed8df1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ mod font;
 pub mod generated;
 mod interpolation;
 mod render;
+pub mod vendored;
 
 use std::time::{Duration, SystemTime};
 
@@ -17,6 +18,8 @@ pub fn main() {
   let window = &mut video_subsystem
     .window("Cosin25 Invite", 512, 256)
     .position_centered()
+    // works lol:
+    // .resizable()
     .build()
     .unwrap();
 
diff --git a/src/render.rs b/src/render.rs
index dbd3761..bd17e2b 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -8,6 +8,31 @@ use sdl2::surface::Surface;
 use sdl2::video::{Window, WindowContext};
 use std::ops::DerefMut;
 
+fn dvd_logo_offset(t: f64, screen_size_x: f64, screen_size_y: f64) -> (f64, f64) {
+  let offset_x = t % (screen_size_x * 2.0);
+  let offset_x = if offset_x > screen_size_x {
+    screen_size_x * 2.0 - offset_x
+  } else {
+    offset_x
+  };
+
+  let offset_y = t % (screen_size_y * 2.0);
+  let offset_y = if offset_y > screen_size_y {
+    screen_size_y * 2.0 - offset_y
+  } else {
+    offset_y
+  };
+
+  (offset_x, offset_y)
+}
+
+const START_UWUSPACE: f64 = 0.0;
+const START_BOUNCE: f64 = 0.5;
+const START_SIN: f64 = 1.5;
+const START_COMETOCOSIN: f64 = 2.5;
+const SCENE_GREETINGS: f64 = 20.0;
+const JUST_DVD: f64 = 70.0;
+
 pub fn render(
   canvas: &mut Canvas<Window>,
   texture_creator: &TextureCreator<WindowContext>,
@@ -19,147 +44,169 @@ pub fn render(
   } else {
     i as u8
   };
-  let sin_offset = time_seconds * 0.1;
 
   let win_size = canvas.window().drawable_size();
 
   canvas.set_draw_color(Color::RGB(12, 12, 12));
   canvas.clear();
 
-  let mut offset: f32 = 0.0;
+  let is_dvd = time_seconds < SCENE_GREETINGS || time_seconds >= JUST_DVD;
 
-  {
-    let bounce_time_offset = 1.5;
-    let bounce_speed = 90.0;
-    let padding_x = 16.0;
-    let padding_y = 16.0;
-    let (offset_x, offset_y) = if time_seconds > bounce_time_offset {
-      let mut uwu_width = padding_x;
-      let mut uwu_height: f32 = padding_y * 2.0;
-      for c in "UwU-Space".chars() {
-        let char = FONT_CHERRY_BOMB_ONE.get_char(c);
-        uwu_width += char.advance_width;
-        if f32::from(char.height) > uwu_height {
-          uwu_height = char.height.into();
+  if is_dvd {
+    let time_seconds = if time_seconds >= JUST_DVD {
+      time_seconds - JUST_DVD + 15.0
+    } else {
+      time_seconds
+    };
+    if time_seconds >= START_UWUSPACE {
+      let bounce_speed = 90.0;
+      let padding_x = 16.0;
+      let padding_y = 16.0;
+      let (offset_x, offset_y) = if time_seconds > START_BOUNCE {
+        let mut uwu_width = padding_x;
+        let mut uwu_height: f32 = padding_y;
+        for c in "UwU-Space".chars() {
+          let char = FONT_CHERRY_BOMB_ONE.get_char(c);
+          uwu_width += char.advance_width;
+          let nh = f32::from(char.height) + padding_y;
+          if nh > uwu_height {
+            uwu_height = nh;
+          }
         }
-      }
-      let virtual_screen_size = (
-        f64::from(win_size.0) - f64::from(uwu_width + padding_x),
-        f64::from(win_size.1) - f64::from(uwu_height + padding_y),
-      );
-      let t = (time_seconds - bounce_time_offset) * bounce_speed;
-      let offset_x = t % (virtual_screen_size.0 * 2.0);
-      let offset_x = if offset_x > virtual_screen_size.0 {
-        virtual_screen_size.0 * 2.0 - offset_x
+        let virtual_screen_size = (
+          f64::from(win_size.0) - (uwu_width + padding_x),
+          f64::from(win_size.1) - f64::from(uwu_height + padding_y),
+        );
+        let t = (time_seconds - START_BOUNCE) * bounce_speed;
+        let (offset_x, offset_y) = dvd_logo_offset(t, virtual_screen_size.0, virtual_screen_size.1);
+        (
+          (padding_x + offset_x).round() as i32,
+          (f64::from(padding_y) + offset_y).round() as i32,
+        )
       } else {
-        offset_x
+        (padding_x.round() as i32, padding_y.round() as i32)
       };
+      let mut offset: f64 = 0.0;
+      for c in "UwU-Space".chars() {
+        let char = FONT_CHERRY_BOMB_ONE.get_char(c);
+        canvas
+          .copy(
+            &char
+              .to_texture(texture_creator, Color::RGB(i, 64, 255 - i))
+              .unwrap(),
+            None,
+            char.to_rect(offset as i32 + offset_x, offset_y),
+          )
+          .unwrap();
+        offset += char.advance_width;
+      }
+    }
+  }
 
-      let offset_y = t % (virtual_screen_size.1 * 2.0);
-      let offset_y = if offset_y > virtual_screen_size.1 {
-        virtual_screen_size.1 * 2.0 - offset_y
-      } else {
-        offset_y
-      };
+  if time_seconds >= JUST_DVD {
+    //
+  } else if time_seconds >= SCENE_GREETINGS {
+    let mut offset = 0.0;
+    let mut rng = rand::thread_rng();
 
-      (
-        (f64::from(padding_x) + offset_x).round() as i32,
-        (f64::from(padding_y) + offset_y).round() as i32,
-      )
-    } else {
-      (padding_x.round() as i32, padding_y.round() as i32)
-    };
-    for c in "UwU-Space".chars() {
-      let char = FONT_CHERRY_BOMB_ONE.get_char(c);
+    for c in "sorry for shit invite we have adhd".chars() {
+      let char = FONT_GALMURI.get_char(c);
       canvas
         .copy(
           &char
-            .to_texture(&texture_creator, Color::RGB(i, 64, 255 - i))
+            .to_texture(texture_creator, Color::RGB(i, 64, 255 - i))
             .unwrap(),
           None,
-          char.to_rect(offset as i32 + offset_x, offset_y),
+          char.to_rect(
+            offset as i32 + 18 + rng.gen_range(-2..2),
+            win_size.1 as i32 - 24 + rng.gen_range(-2..2),
+          ),
         )
         .unwrap();
       offset += char.advance_width;
     }
-  }
-
-  offset = 0.0;
-  let mut rng = rand::thread_rng();
-
-  for c in "sorry for shit invite we have adhd".chars() {
-    let char = FONT_GALMURI.get_char(c);
-    canvas
-      .copy(
-        &char
-          .to_texture(&texture_creator, Color::RGB(i, 64, 255 - i))
-          .unwrap(),
-        None,
-        char.to_rect(
-          offset as i32 + 18 + rng.gen_range(-2..2),
-          16 + 36 + rng.gen_range(-2..2),
-        ),
-      )
-      .unwrap();
-    offset += char.advance_width / 1.0;
-  }
-
-  {
-    let mut sin_surface = Surface::new(512, 256, PixelFormatEnum::RGBA32).unwrap();
-
-    let w = sin_surface.width();
-    let h = sin_surface.height();
-    let f = &mut sin_surface.deref_mut().without_lock_mut().unwrap();
+  } else {
+    if time_seconds >= START_SIN {
+      let time_seconds = time_seconds - START_SIN;
+      let base_sin_offset = time_seconds * 0.1;
+      let sin_offset = base_sin_offset - 0.75;
+      let mut sin_surface = Surface::new(win_size.0, win_size.1, PixelFormatEnum::RGBA32).unwrap();
 
-    for x in 0..w {
+      let w = win_size.0;
+      let h = win_size.1;
       let f64_w = f64::from(w);
       let f64_h = f64::from(h);
-      let sin_x = {
-        let mut sin_x = f64::from(x) + (sin_offset * f64_w);
-        if sin_x > f64_w {
-          sin_x = sin_x - f64_w;
-        }
-        sin_x
-      };
-      let sin_y =
-        ((f64::sin(sin_x * (3.141 * 2.0) / f64_w) + 1.0) * (f64_h / 2.0)).floor() as usize;
-      // let sin_idx = (sin_y * w as usize + x as usize) * 4;
-
-      for y in 0..h {
-        let idx = (y * w + x) as usize * 4;
-        f[idx] = 122 - (x / 8) as u8;
-        f[idx + 1] = 255 - (x / 2) as u8;
-        f[idx + 2] = (x / 2) as u8;
-        f[idx + 3] = if sin_y < y as usize {
-          if idx % 5 == 0 {
-            255
-          } else {
-            122
+      let f = &mut sin_surface.deref_mut().without_lock_mut().unwrap();
+
+      let min_x_pos = (if base_sin_offset > 1.0 {
+        0.0
+      } else {
+        1.0 - base_sin_offset
+      }) * f64_w;
+
+      for x in 0..w {
+        let f64_x = f64::from(x);
+        let out_of_frame = f64_x < min_x_pos;
+        let sin_x = {
+          let mut sin_x = f64_x + (sin_offset * f64_w);
+          if sin_x > f64_w {
+            sin_x -= f64_w;
           }
-        } else {
-          0
+          sin_x
         };
+        let sin_y =
+          ((f64::sin(sin_x * (3.141 * 2.0) / f64_w) + 1.0) * (f64_h / 2.0)).floor() as usize;
+        // let sin_idx = (sin_y * w as usize + x as usize) * 4;
+
+        for y in 0..h {
+          let idx = (y * w + x) as usize * 4;
+          let cx = x * 512 / w;
+          f[idx] = (122 - (cx / 8)) as u8;
+          f[idx + 1] = (255 - (cx / 2)) as u8;
+          f[idx + 2] = (cx / 2) as u8;
+          f[idx + 3] = if out_of_frame {
+            0
+          } else if sin_y < y as usize {
+            let v: u16 = if idx % 5 == 0 { 255 } else { 122 };
+            let v = if (sin_y + 3) < (y as usize) {
+              v
+            } else {
+              v * 2 / 3
+            };
+            v as u8
+          } else {
+            0
+          };
+        }
       }
-    }
 
-    let sin_texture = Texture::from_surface(&sin_surface, &texture_creator).unwrap();
+      let sin_texture = Texture::from_surface(&sin_surface, texture_creator).unwrap();
 
-    canvas
-      .copy(&sin_texture, None, Rect::new(0, 0, win_size.0, win_size.1))
-      .unwrap();
-  }
-  offset = 0.0;
-  for c in "Come to Cosin25 :3".chars() {
-    let char = FONT_GALMURI.get_char(c);
-    canvas
-      .copy(
-        &char
-          .to_texture(&texture_creator, Color::RGB(i, 64, 255 - i))
-          .unwrap(),
-        None,
-        char.to_rect(offset as i32 + 18, win_size.1 as i32 - 32),
-      )
-      .unwrap();
-    offset += char.advance_width / 1.1;
+      canvas
+        .copy(&sin_texture, None, Rect::new(0, 0, win_size.0, win_size.1))
+        .unwrap();
+    }
+    if time_seconds >= START_COMETOCOSIN {
+      let time_seconds = time_seconds - START_COMETOCOSIN;
+      let wrap_width = f64::from(win_size.0);
+      let mut offset = (18.0 + (time_seconds * 32.0)) % wrap_width;
+      // WARNING: we wrap this! if the text is wider than the window, this whole thing falls apart
+      for c in "Come to Cosin25 :3".chars() {
+        let char = FONT_GALMURI.get_char(c);
+        canvas
+          .copy(
+            &char
+              .to_texture(texture_creator, Color::RGB(i, 64, 255 - i))
+              .unwrap(),
+            None,
+            char.to_rect(offset as i32, win_size.1 as i32 - 32),
+          )
+          .unwrap();
+        offset += char.advance_width;
+        if offset > wrap_width {
+          offset -= wrap_width;
+        }
+      }
+    }
   }
 }
diff --git a/src/vendored/micromod-rs/ATTRIBUTION b/src/vendored/micromod-rs/ATTRIBUTION
new file mode 100644
index 0000000..2f5cc0f
--- /dev/null
+++ b/src/vendored/micromod-rs/ATTRIBUTION
@@ -0,0 +1 @@
+https://github.com/aspizu/micromod-rust/tree/bcf4f62610c2a7b4b417cbde79241efdaa7ed71d
\ No newline at end of file
diff --git a/src/vendored/micromod-rs/COPYING b/src/vendored/micromod-rs/COPYING
new file mode 100644
index 0000000..f5dc43e
--- /dev/null
+++ b/src/vendored/micromod-rs/COPYING
@@ -0,0 +1,37 @@
+---
+Copyright (c) 2019, Martin Cameron
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or
+without modification, are permitted provided that the
+following conditions are met:
+
+ * Redistributions of source code must retain the above
+   copyright notice, this list of conditions and the
+   following disclaimer.
+
+ * Redistributions in binary form must reproduce the
+   above copyright notice, this list of conditions and the
+   following disclaimer in the documentation and/or other
+   materials provided with the distribution.
+ 
+ * Neither the name of the organization nor the names of
+   its contributors may be used to endorse or promote
+   products derived from this software without specific
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+---
\ No newline at end of file
diff --git a/src/vendored/micromod-rs/consts.rs b/src/vendored/micromod-rs/consts.rs
new file mode 100644
index 0000000..092766d
--- /dev/null
+++ b/src/vendored/micromod-rs/consts.rs
@@ -0,0 +1,11 @@
+pub static MICROMOD_VERSION: &str = "Micromod Protracker replay 20180625 (c)mumart@gmail.com";
+pub static FINE_TUNING: [u16; 16] = [
+  4340, 4308, 4277, 4247, 4216, 4186, 4156, 4126, 4096, 4067, 4037, 4008, 3979, 3951, 3922, 3894,
+];
+pub static ARP_TUNING: [u16; 16] = [
+  4096, 3866, 3649, 3444, 3251, 3069, 2896, 2734, 2580, 2435, 2299, 2170, 2048, 1933, 1825, 1722,
+];
+pub static SINE_TABLE: [u8; 32] = [
+  0, 24, 49, 74, 97, 120, 141, 161, 180, 197, 212, 224, 235, 244, 250, 253, 255, 253, 250, 244,
+  235, 224, 212, 197, 180, 161, 141, 120, 97, 74, 49, 24,
+];
diff --git a/src/vendored/micromod-rs/mod.rs b/src/vendored/micromod-rs/mod.rs
new file mode 100644
index 0000000..1d1934a
--- /dev/null
+++ b/src/vendored/micromod-rs/mod.rs
@@ -0,0 +1,860 @@
+//! Experiment with converting [Micromod](https://github.com/martincameron/micromod) with
+//! [c2rust](https://c2rust.com/).
+//!
+//! Safetyfication done manually
+
+#![warn(missing_docs)]
+
+mod consts;
+
+use std::cmp::Ordering;
+
+#[derive(Copy, Clone, Default)]
+struct Channel {
+  note: Note,
+  period: u16,
+  porta_period: u16,
+  sample_offset: usize,
+  sample_idx: usize,
+  step: usize,
+  volume: u8,
+  panning: u8,
+  fine_tune: u8,
+  ampl: u8,
+  mute: u8,
+  id: u8,
+  instrument: u8,
+  assigned: u8,
+  porta_speed: u8,
+  pl_row: u8,
+  fx_count: u8,
+  vibrato_type: u8,
+  vibrato_phase: u8,
+  vibrato_speed: u8,
+  vibrato_depth: u8,
+  tremolo_type: u8,
+  tremolo_phase: u8,
+  tremolo_speed: u8,
+  tremolo_depth: u8,
+  tremolo_add: i8,
+  vibrato_add: i8,
+  arpeggio_add: i8,
+}
+#[derive(Copy, Clone, Default)]
+struct Note {
+  key: u16,
+  instrument: u8,
+  effect: u8,
+  param: u8,
+}
+#[derive(Copy, Clone)]
+struct Instrument<'src> {
+  volume: u8,
+  fine_tune: u8,
+  loop_start: usize,
+  loop_length: usize,
+  sample_data: &'src [i8],
+}
+
+impl Instrument<'_> {
+  fn dummy() -> Self {
+    Self {
+      volume: 0,
+      fine_tune: 0,
+      loop_start: 0,
+      loop_length: 0,
+      sample_data: &[],
+    }
+  }
+}
+
+/// Immutable source data of the module
+struct ModSrc<'src> {
+  instruments: Vec<Instrument<'src>>,
+  module_data: &'src [i8],
+  pattern_data: &'src [u8],
+  sequence: &'src [u8],
+  num_patterns: isize,
+  num_channels: isize,
+  song_length: isize,
+}
+
+#[derive(Default)]
+struct PlaybackState {
+  gain: isize,
+  c2_rate: isize,
+  tick_len: isize,
+  tick_offset: isize,
+  pattern: isize,
+  break_pattern: isize,
+  row: isize,
+  next_row: isize,
+  tick: isize,
+  speed: isize,
+  pl_count: isize,
+  pl_channel: isize,
+  random_seed: isize,
+}
+
+/// A micromod decoding instance thingy.
+pub struct MmC2r<'src> {
+  sample_rate: isize,
+  channels: [Channel; 16],
+  src: ModSrc<'src>,
+  playback: PlaybackState,
+}
+
+fn calculate_num_patterns(module_header: &[i8]) -> isize {
+  let mut num_patterns_0;
+  let mut order_entry;
+  let mut pattern_0;
+  num_patterns_0 = 0;
+  pattern_0 = 0;
+  while pattern_0 < 128 {
+    order_entry = (module_header[(952 + pattern_0) as usize] as i32 & 0x7f_i32) as isize;
+    if order_entry >= num_patterns_0 {
+      num_patterns_0 = order_entry + 1;
+    }
+    pattern_0 += 1;
+  }
+  num_patterns_0
+}
+
+fn calculate_num_channels(module_header: &[i8]) -> Option<isize> {
+  const MAX_CHANNELS: isize = 16;
+  let numchan: isize = match ((module_header[1082] as isize) << 8) | module_header[1083] as isize {
+    // M.K.  M!K!     N.T.     FLT4
+    0x4b2e | 0x4b21 | 0x542e | 0x5434 => 4,
+    // xCHN
+    0x484e => (module_header[1080] - 48) as isize,
+    // xxCH
+    0x4348 => (((module_header[1080] - 48) * 10) + (module_header[1081] - 48)) as isize,
+    // Not recognised.
+    _ => 0,
+  };
+  if numchan > MAX_CHANNELS {
+    None
+  } else {
+    Some(numchan)
+  }
+}
+fn unsigned_short_big_endian(buf: &[i8], offset: isize) -> isize {
+  ((buf[offset as usize] as i32 & 0xff_i32) << 8 | buf[(offset + 1) as usize] as i32 & 0xff_i32)
+    as isize
+}
+fn set_tempo(tempo: isize, tick_len: &mut isize, sample_rate: isize) {
+  *tick_len = ((sample_rate << 1) + (sample_rate >> 1)) / tempo;
+}
+fn update_frequency(chan: &mut Channel, sample_rate: isize, gain: &mut isize, c2_rate: &mut isize) {
+  let mut period;
+  let mut volume;
+
+  period = (chan.period as i32 + chan.vibrato_add as i32) as isize;
+  period = (period * consts::ARP_TUNING[chan.arpeggio_add as usize] as isize) >> 11;
+  period = (period >> 1) + (period & 1);
+  if period < 14 {
+    period = 6848;
+  }
+  let freq = (*c2_rate * 428 / period) as usize;
+  chan.step = (freq << 14).wrapping_div(sample_rate as usize);
+  volume = (chan.volume as i32 + chan.tremolo_add as i32) as isize;
+  volume = volume.clamp(0, 64);
+  chan.ampl = ((volume * *gain) >> 5) as u8;
+}
+fn tone_portamento(chan: &mut Channel) {
+  let mut source;
+
+  source = chan.period as isize;
+  let dest = chan.porta_period as isize;
+  match source.cmp(&dest) {
+    Ordering::Less => {
+      source += chan.porta_speed as isize;
+      if source > dest {
+        source = dest;
+      }
+    }
+    Ordering::Equal => { /* Do absolutely nothing */ }
+    Ordering::Greater => {
+      source -= chan.porta_speed as isize;
+      if source < dest {
+        source = dest;
+      }
+    }
+  }
+  chan.period = source as u16;
+}
+fn volume_slide(chan: &mut Channel, param: isize) {
+  let mut volume;
+  volume = chan.volume as isize + (param >> 4) - (param & 0xf);
+  volume = volume.clamp(0, 64);
+  chan.volume = volume as u8;
+}
+fn waveform(phase: isize, type_0: isize, random_seed: &mut isize) -> isize {
+  let mut amplitude: isize = 0;
+  match type_0 & 0x3 {
+    0 => {
+      amplitude = consts::SINE_TABLE[(phase & 0x1f) as usize] as isize;
+      if phase & 0x20 > 0 {
+        amplitude = -amplitude;
+      }
+    }
+    1 => {
+      amplitude = 255 - (((phase + 0x20) & 0x3f) << 3);
+    }
+    2 => {
+      amplitude = 255 - ((phase & 0x20) << 4);
+    }
+    3 => {
+      amplitude = (*random_seed >> 20) - 255;
+      *random_seed = (*random_seed * 65 + 17) & 0x1fffffff;
+    }
+    _ => {}
+  }
+  amplitude
+}
+fn vibrato(chan: &mut Channel, random_seed: &mut isize) {
+  chan.vibrato_add = ((waveform(
+    chan.vibrato_phase as isize,
+    chan.vibrato_type as isize,
+    random_seed,
+  ) * chan.vibrato_depth as isize)
+    >> 7) as i8;
+}
+fn tremolo(chan: &mut Channel, random_seed: &mut isize) {
+  chan.tremolo_add = ((waveform(
+    chan.tremolo_phase as isize,
+    chan.tremolo_type as isize,
+    random_seed,
+  ) * chan.tremolo_depth as isize)
+    >> 6) as i8;
+}
+fn trigger(channel: &mut Channel, instruments: &[Instrument]) {
+  let period;
+
+  let ins = channel.note.instrument as isize;
+  if ins > 0 && ins < 32 {
+    channel.assigned = ins as u8;
+    channel.sample_offset = 0;
+    channel.fine_tune = instruments[ins as usize].fine_tune;
+    channel.volume = instruments[ins as usize].volume;
+    if instruments[ins as usize].loop_length > 0 && channel.instrument as i32 > 0 {
+      channel.instrument = ins as u8;
+    }
+  }
+  if channel.note.effect as i32 == 0x9_i32 {
+    channel.sample_offset = ((channel.note.param as i32 & 0xff_i32) << 8) as usize;
+  } else if channel.note.effect as i32 == 0x15_i32 {
+    channel.fine_tune = channel.note.param;
+  }
+  if channel.note.key as i32 > 0 {
+    period = ((channel.note.key as i32
+      * consts::FINE_TUNING[(channel.fine_tune as i32 & 0xf_i32) as usize] as i32)
+      >> 11) as isize;
+    channel.porta_period = ((period >> 1) + (period & 1)) as u16;
+    if channel.note.effect as i32 != 0x3_i32 && channel.note.effect as i32 != 0x5_i32 {
+      channel.instrument = channel.assigned;
+      channel.period = channel.porta_period;
+      channel.sample_idx = channel.sample_offset << 14;
+      if (channel.vibrato_type as i32) < 4 {
+        channel.vibrato_phase = 0;
+      }
+      if (channel.tremolo_type as i32) < 4 {
+        channel.tremolo_phase = 0;
+      }
+    }
+  }
+}
+fn channel_row(chan: &mut Channel, sample_rate: isize, src: &ModSrc, playback: &mut PlaybackState) {
+  let volume;
+  let period;
+  let effect = chan.note.effect as isize;
+  let param = chan.note.param as isize;
+  let fresh0 = &mut chan.fx_count;
+  *fresh0 = 0;
+  let fresh1 = &mut chan.arpeggio_add;
+  *fresh1 = *fresh0 as i8;
+  let fresh2 = &mut chan.tremolo_add;
+  *fresh2 = *fresh1;
+  chan.vibrato_add = *fresh2;
+  if !(effect == 0x1d && param > 0) {
+    trigger(chan, &src.instruments);
+  }
+  match effect {
+    3 => {
+      if param > 0 {
+        chan.porta_speed = param as u8;
+      }
+    }
+    4 => {
+      if param & 0xf0 > 0 {
+        chan.vibrato_speed = (param >> 4) as u8;
+      }
+      if param & 0xf > 0 {
+        chan.vibrato_depth = (param & 0xf) as u8;
+      }
+      vibrato(chan, &mut playback.random_seed);
+    }
+    6 => {
+      vibrato(chan, &mut playback.random_seed);
+    }
+    7 => {
+      if param & 0xf0 > 0 {
+        chan.tremolo_speed = (param >> 4) as u8;
+      }
+      if param & 0xf > 0 {
+        chan.tremolo_depth = (param & 0xf) as u8;
+      }
+      tremolo(chan, &mut playback.random_seed);
+    }
+    8 => {
+      if src.num_channels != 4 {
+        chan.panning = (if param < 128 { param } else { 127 }) as u8;
+      }
+    }
+    11 => {
+      if playback.pl_count < 0 {
+        playback.break_pattern = param;
+        playback.next_row = 0;
+      }
+    }
+    12 => {
+      chan.volume = (if param > 64 { 64 } else { param }) as u8;
+    }
+    13 => {
+      if playback.pl_count < 0 {
+        if playback.break_pattern < 0 {
+          playback.break_pattern = playback.pattern + 1;
+        }
+        playback.next_row = (param >> 4) * 10 + (param & 0xf);
+        if playback.next_row >= 64 {
+          playback.next_row = 0;
+        }
+      }
+    }
+    15 => {
+      if param > 0 {
+        if param < 32 {
+          playback.speed = param;
+          playback.tick = playback.speed;
+        } else {
+          set_tempo(param, &mut playback.tick_len, sample_rate);
+        }
+      }
+    }
+    17 => {
+      period = chan.period as isize - param;
+      chan.period = (if period < 0 { 0 } else { period }) as u16;
+    }
+    18 => {
+      period = chan.period as isize + param;
+      chan.period = (if period > 65535 { 65535 } else { period }) as u16;
+    }
+    20 => {
+      if param < 8 {
+        chan.vibrato_type = param as u8;
+      }
+    }
+    22 => {
+      if param == 0 {
+        chan.pl_row = playback.row as u8;
+      }
+      if (chan.pl_row as isize) < playback.row && playback.break_pattern < 0 {
+        if playback.pl_count < 0 {
+          playback.pl_count = param;
+          playback.pl_channel = chan.id as isize;
+        }
+        if playback.pl_channel == chan.id as isize {
+          if playback.pl_count == 0 {
+            chan.pl_row = (playback.row + 1) as u8;
+          } else {
+            playback.next_row = chan.pl_row as isize;
+          }
+          playback.pl_count -= 1;
+        }
+      }
+    }
+    23 => {
+      if param < 8 {
+        chan.tremolo_type = param as u8;
+      }
+    }
+    26 => {
+      volume = chan.volume as isize + param;
+      chan.volume = (if volume > 64 { 64 } else { volume }) as u8;
+    }
+    27 => {
+      volume = chan.volume as isize - param;
+      chan.volume = (if volume < 0 { 0 } else { volume }) as u8;
+    }
+    28 => {
+      if param <= 0 {
+        chan.volume = 0;
+      }
+    }
+    30 => {
+      playback.tick = playback.speed + playback.speed * param;
+    }
+    _ => {}
+  }
+  update_frequency(chan, sample_rate, &mut playback.gain, &mut playback.c2_rate);
+}
+fn channel_tick(
+  chan: &mut Channel,
+  sample_rate: isize,
+  gain: &mut isize,
+  c2_rate: &mut isize,
+  random_seed: &mut isize,
+  instruments: &[Instrument],
+) {
+  let period;
+  let effect = chan.note.effect as isize;
+  let param = chan.note.param as isize;
+  let fresh3 = &mut chan.fx_count;
+  *fresh3 = (*fresh3).wrapping_add(1);
+  match effect {
+    1 => {
+      period = chan.period as isize - param;
+      chan.period = (if period < 0 { 0 } else { period }) as u16;
+    }
+    2 => {
+      period = chan.period as isize + param;
+      chan.period = (if period > 65535 { 65535 } else { period }) as u16;
+    }
+    3 => {
+      tone_portamento(chan);
+    }
+    4 => {
+      let fresh4 = &mut chan.vibrato_phase;
+      *fresh4 = (*fresh4 as i32 + chan.vibrato_speed as i32) as u8;
+      vibrato(chan, random_seed);
+    }
+    5 => {
+      tone_portamento(chan);
+      volume_slide(chan, param);
+    }
+    6 => {
+      let fresh5 = &mut chan.vibrato_phase;
+      *fresh5 = (*fresh5 as i32 + chan.vibrato_speed as i32) as u8;
+      vibrato(chan, random_seed);
+      volume_slide(chan, param);
+    }
+    7 => {
+      let fresh6 = &mut chan.tremolo_phase;
+      *fresh6 = (*fresh6 as i32 + chan.tremolo_speed as i32) as u8;
+      tremolo(chan, random_seed);
+    }
+    10 => {
+      volume_slide(chan, param);
+    }
+    14 => {
+      if chan.fx_count as i32 > 2 {
+        chan.fx_count = 0;
+      }
+      if chan.fx_count as i32 == 0 {
+        chan.arpeggio_add = 0;
+      }
+      if chan.fx_count as i32 == 1 {
+        chan.arpeggio_add = (param >> 4) as i8;
+      }
+      if chan.fx_count as i32 == 2 {