From 98de801ea7b5cf3e8602cf404f1affa66fd3a535 Mon Sep 17 00:00:00 2001
From: memdmp <memdmp@memeware.net>
Date: Mon, 13 Jan 2025 12:04:26 +0100
Subject: feat: sin wave 1st implementatino

---
 src/main.rs | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 55 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 659f84b..ae1cdaf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,12 @@ use font::BakedFont;
 use generated::fonts::{FONT_CHERRY_BOMB_ONE, FONT_GALMURI};
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
-use sdl2::pixels::Color;
+use sdl2::pixels::{Color, PixelFormatEnum};
+use sdl2::rect::Rect;
+use sdl2::render::Texture;
+use sdl2::surface::Surface;
+use std::ops::DerefMut;
+use std::sync::Arc;
 use std::time::Duration;
 
 pub fn main() {
@@ -15,7 +20,7 @@ pub fn main() {
   let video_subsystem = sdl_context.video().unwrap();
 
   let window = &mut video_subsystem
-    .window("Cosin25 Invite", 320, 256)
+    .window("Cosin25 Invite", 512, 256)
     .position_centered()
     .build()
     .unwrap();
@@ -27,9 +32,18 @@ pub fn main() {
   canvas.present();
   let mut event_pump = sdl_context.event_pump().unwrap();
   let mut i = 0;
+
+  // amount to incr sin_offset by per frame
+  // TODO: do not bind to framerate u silly bean
+  let sin_speed = 0.0025;
+  let mut sin_offset = 0.5;
   'running: loop {
     i = (i + 1) % 255;
 
+    if sin_offset > 1.0 {
+      sin_offset -= 1.0;
+    }
+
     canvas.set_draw_color(Color::RGB(12, 12, 12));
     canvas.clear();
 
@@ -47,6 +61,44 @@ pub fn main() {
         .unwrap();
       offset += char.advance_width;
     }
+
+    {
+      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();
+
+      for x in 0..w {
+        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] = 255;
+          f[idx + 1] = 255;
+          f[idx + 2] = 255;
+          f[idx + 3] = if sin_y > y as usize { 255 } else { 0 };
+        }
+      }
+      sin_offset += sin_speed;
+
+      let sin_texture = Texture::from_surface(&sin_surface, &texture_creator).unwrap();
+
+      canvas
+        .copy(&sin_texture, None, Rect::new(0, 0, 512, 256))
+        .unwrap();
+    }
     offset = 0.0;
     for c in "Come to Cosin25 :3".chars() {
       let char = FONT_GALMURI.get_char(c);
@@ -73,6 +125,6 @@ pub fn main() {
     }
     // The rest of the game loop goes here...
     canvas.present();
-    ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
+    ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 120));
   }
 }
-- 
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