update_fft.rs

use crate::fft::time_interpolate;
use crate::*;
use bevy::render::mesh::VertexAttributeValues;
use bevy::sprite::Anchor;
use bevy::{
    app::AppExit,
    prelude::*,
    sprite::{MaterialMesh2dBundle, Mesh2dHandle},
};
use bevy_egui::egui::{Align2, Color32, Stroke};
use bevy_egui::{egui, EguiContexts, EguiPlugin};
use clap::{ArgAction, Parser};
use rayon::iter::{IntoParallelRefMutIterator, ParallelIterator};
use rodio::{source::Source, Decoder, OutputStream};
use std::ffi::OsString;
use std::fs::File;
use std::io::BufReader;
use std::path::PathBuf;
use std::time::Duration;

pub fn update_fft(
    mut commands: Commands,
    mut window: Query<&mut Window>,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
    mut app_state: ResMut<AppState>,
    mut args: ResMut<FFTArgs>,
    mut clear_color: ResMut<ClearColor>,
    mut text_query: Query<&mut Text>,
) {
    let h = window.single_mut().height();
    let mut update_i = false;
    let interval = RENDERING_FPS / args.fft_fps;

    // Get the current frame (either from fft or interpolation)
    let clamped_frame_counter = app_state.fft_frame_counter.clamp(0, app_state.fft.len() - 1);
    let curr_fft = match app_state.total_frame_counter as u32 % interval {
        0 => {
            if app_state.fft_frame_counter > app_state.fft.len() {
                std::process::exit(0);
            }
            update_i = true;
            app_state.fft[clamped_frame_counter].clone()
        }
        rem => time_interpolate(
            &(app_state.fft[clamped_frame_counter - 1]),
            &(app_state.fft[clamped_frame_counter]),
            rem as f32 / interval as f32,
        ),
    };

    // Iterate through all currently displayed bars to change values
    for (handle, new_value) in app_state.curr_bars.chunks(2).zip(curr_fft.iter()) {
        let (handle1, handle2) = (handle[0].0.clone_weak(), handle[1].0.clone_weak());

        let dims = meshes
            .get_mut(handle1)
            .unwrap()
            .attribute_mut(Mesh::ATTRIBUTE_POSITION)
            .unwrap();
        let bar_value_1 =
            (new_value.clone() * (h / 2.0) as f32).clamp(h * MIN_BAR_HEIGHT, h * MAX_BAR_HEIGHT);
        match dims {
            VertexAttributeValues::Float32x3(x) => {
                x[0][1] = bar_value_1;
                x[1][1] = bar_value_1;
                x[2][1] = -bar_value_1;
                x[3][1] = -bar_value_1;
            }
            _ => {}
        }

        let dims = meshes.get_mut(handle2).unwrap().attribute_mut(Mesh::ATTRIBUTE_POSITION).unwrap();
        let bar_value_2 = (new_value.clone() * (h / 2.0) as f32 - args.border_size as f32)
            .clamp(h * MIN_BAR_HEIGHT, h * MAX_BAR_HEIGHT);
        match dims {
            VertexAttributeValues::Float32x3(x) => {
                x[0][1] = bar_value_2;
                x[1][1] = bar_value_2;
                x[2][1] = -bar_value_2;
                x[3][1] = -bar_value_2;
            }
            _ => {}
        }
    }

    // Moves real frame and interpolated frame counters
    if !args.paused {
        if update_i {
            app_state.fft_frame_counter += 1;
        }
        app_state.total_frame_counter += 1;
    }
}