From b8aee4788d636e1bae49244ea6e326bf6a8b8015 Mon Sep 17 00:00:00 2001
From: Matthew Deville <matthew@stockly.ai>
Date: Sun, 31 Aug 2025 13:47:28 +0200
Subject: [PATCH] wip

---
 src/main.rs     | 138 ++++--------------------------------------------
 src/material.rs |  61 +++++++++++++++++++++
 src/systems.rs  |  64 ++++++++++++++++++++++
 3 files changed, 135 insertions(+), 128 deletions(-)
 create mode 100644 src/material.rs
 create mode 100644 src/systems.rs

diff --git a/src/main.rs b/src/main.rs
index 5c08a0c..b171128 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,16 +1,10 @@
 //! A shader that uses the WGSL shading language.
+mod material;
+mod systems;
 
-use bevy::{
-    asset::AssetEvent,
-    input::common_conditions::*,
-    prelude::*,
-    reflect::TypePath,
-    render::render_resource::{AsBindGroup, Shader, ShaderRef},
-    sprite::{AlphaMode2d, Material2d, Material2dPlugin},
-    window::{PrimaryWindow, WindowMode},
-};
+use bevy::{input::common_conditions::input_just_pressed, prelude::*, sprite::Material2dPlugin};
 
-const SHADER_ASSET_PATH: &str = "shaders/default.wgsl";
+use material::CustomMaterial;
 
 fn main() {
     App::new()
@@ -18,128 +12,16 @@ fn main() {
             DefaultPlugins,
             Material2dPlugin::<CustomMaterial>::default(),
         ))
-        .add_systems(Startup, setup)
+        .add_systems(Startup, systems::setup)
         .add_systems(
             Update,
             (
-                update_material_time,
-                resize_fullscreen_quad,
-                shader_hot_reload,
-                exit_app.run_if(input_just_pressed(KeyCode::Escape)),
-                toggle_fullscreen.run_if(input_just_pressed(KeyCode::F11)),
+                material::update_material_time,
+                material::shader_hot_reload,
+                systems::resize_fullscreen_quad,
+                systems::exit_app.run_if(input_just_pressed(KeyCode::Escape)),
+                systems::toggle_fullscreen.run_if(input_just_pressed(KeyCode::F11)),
             ),
         )
         .run();
 }
-
-/// set up a simple 2D-screen-like surface
-fn setup(
-    mut meshes: ResMut<Assets<Mesh>>,
-    mut materials: ResMut<Assets<CustomMaterial>>,
-    mut primary_window: Single<&mut Window, With<PrimaryWindow>>,
-    mut commands: Commands,
-) {
-    primary_window.decorations = false;
-
-    commands.spawn(Camera2d);
-
-    // quad that fills the whole window
-    let screen_size = Vec2::new(
-        primary_window.resolution.width(),
-        primary_window.resolution.height(),
-    );
-    // create material with initial time = 0.0
-    let material_handle = materials.add(CustomMaterial {
-        time: 0.0,
-        resolution: screen_size,
-    });
-
-    commands.spawn((
-        Mesh2d(meshes.add(Rectangle::default())),
-        MeshMaterial2d(material_handle),
-        Transform::from_scale(Vec3::new(screen_size.x, screen_size.y, 1.0)),
-        FullscreenQuad,
-    ));
-}
-
-/// Marker component for the fullscreen quad so we can update it on window resize
-#[derive(Component)]
-struct FullscreenQuad;
-
-/// Update fullscreen quad transforms when the primary window is resized.
-fn resize_fullscreen_quad(
-    primary_window: Single<&Window, With<PrimaryWindow>>,
-    mut transform: Single<&mut Transform, With<FullscreenQuad>>,
-) {
-    let size = Vec2::new(
-        primary_window.resolution.width(),
-        primary_window.resolution.height(),
-    );
-    transform.scale = Vec3::new(size.x, size.y, 1.0);
-}
-
-fn exit_app(mut exit: EventWriter<AppExit>) {
-    exit.write(AppExit::Success);
-}
-
-fn toggle_fullscreen(mut primary_window: Single<&mut Window, With<PrimaryWindow>>) {
-    primary_window.mode = match primary_window.mode {
-        WindowMode::BorderlessFullscreen(_) => WindowMode::Windowed,
-        WindowMode::Windowed => WindowMode::BorderlessFullscreen(MonitorSelection::Current),
-        WindowMode::Fullscreen(_, _) => WindowMode::BorderlessFullscreen(MonitorSelection::Current),
-    };
-}
-
-/// Listen for shader asset changes and force materials to update so the new shader is used.
-fn shader_hot_reload(
-    mut shader_events: EventReader<AssetEvent<Shader>>,
-    mut materials: ResMut<Assets<CustomMaterial>>,
-) {
-    let mut reload_needed = false;
-    for event in shader_events.read() {
-        match event {
-            AssetEvent::Modified { .. } => {
-                info!("shader changed: {event:?}");
-                reload_needed = true;
-            }
-            _ => {}
-        }
-    }
-
-    if reload_needed {
-        // iterate all materials and 'touch' them so Bevy updates bindings using the recompiled shader
-        for (_handle, material) in materials.iter_mut() {
-            // assign to itself to mark changed
-            let cloned = material.clone();
-            *material = cloned;
-        }
-    }
-}
-
-// This is the struct that will be passed to your shader
-#[derive(Asset, TypePath, AsBindGroup, Clone)]
-struct CustomMaterial {
-    #[uniform(0)]
-    time: f32,
-    #[uniform(1)]
-    resolution: Vec2,
-}
-
-fn update_material_time(mut materials: ResMut<Assets<CustomMaterial>>, time: Res<Time>) {
-    let t = time.elapsed_secs();
-    for (_handle, material) in materials.iter_mut() {
-        material.time = t;
-    }
-}
-
-/// The Material2d trait is very configurable, but comes with sensible defaults for all methods.
-/// You only need to implement functions for features that need non-default behavior. See the Material2d api docs for details!
-impl Material2d for CustomMaterial {
-    fn fragment_shader() -> ShaderRef {
-        SHADER_ASSET_PATH.into()
-    }
-
-    fn alpha_mode(&self) -> AlphaMode2d {
-        AlphaMode2d::Opaque
-    }
-}
diff --git a/src/material.rs b/src/material.rs
new file mode 100644
index 0000000..22a8ca4
--- /dev/null
+++ b/src/material.rs
@@ -0,0 +1,61 @@
+use bevy::{
+    asset::AssetEvent,
+    prelude::*,
+    reflect::TypePath,
+    render::render_resource::{AsBindGroup, Shader, ShaderRef},
+    sprite::{AlphaMode2d, Material2d},
+};
+
+const SHADER_ASSET_PATH: &str = "shaders/default.wgsl";
+
+// This is the struct that will be passed to your shader
+#[derive(Asset, TypePath, AsBindGroup, Clone)]
+pub struct CustomMaterial {
+    #[uniform(0)]
+    pub time: f32,
+    #[uniform(1)]
+    pub resolution: Vec2,
+}
+
+pub fn update_material_time(mut materials: ResMut<Assets<CustomMaterial>>, time: Res<Time>) {
+    let t = time.elapsed_secs();
+    for (_handle, material) in materials.iter_mut() {
+        material.time = t;
+    }
+}
+
+/// Listen for shader asset changes and force materials to update so the new shader is used.
+pub fn shader_hot_reload(
+    mut shader_events: EventReader<AssetEvent<Shader>>,
+    mut materials: ResMut<Assets<CustomMaterial>>,
+) {
+    let mut reload_needed = false;
+    for event in shader_events.read() {
+        match event {
+            AssetEvent::Modified { .. } => {
+                info!("shader changed: {event:?}");
+                reload_needed = true;
+            }
+            _ => {}
+        }
+    }
+
+    if reload_needed {
+        // iterate all materials and 'touch' them so Bevy updates bindings using the recompiled shader
+        for (_handle, material) in materials.iter_mut() {
+            // assign to itself to mark changed
+            let cloned = material.clone();
+            *material = cloned;
+        }
+    }
+}
+
+impl Material2d for CustomMaterial {
+    fn fragment_shader() -> ShaderRef {
+        SHADER_ASSET_PATH.into()
+    }
+
+    fn alpha_mode(&self) -> AlphaMode2d {
+        AlphaMode2d::Opaque
+    }
+}
diff --git a/src/systems.rs b/src/systems.rs
new file mode 100644
index 0000000..9e13c39
--- /dev/null
+++ b/src/systems.rs
@@ -0,0 +1,64 @@
+use bevy::{
+    prelude::*,
+    window::{PrimaryWindow, WindowMode},
+};
+
+use crate::material::CustomMaterial;
+
+/// Marker component for the fullscreen quad so we can update it on window resize
+#[derive(Component)]
+pub struct FullscreenQuad;
+
+/// set up a simple 2D-screen-like surface
+pub fn setup(
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<CustomMaterial>>,
+    mut primary_window: Single<&mut Window, With<PrimaryWindow>>,
+    mut commands: Commands,
+) {
+    primary_window.decorations = false;
+
+    commands.spawn(Camera2d);
+
+    // quad that fills the whole window
+    let screen_size = Vec2::new(
+        primary_window.resolution.width(),
+        primary_window.resolution.height(),
+    );
+    // create material with initial time = 0.0
+    let material_handle = materials.add(CustomMaterial {
+        time: 0.0,
+        resolution: screen_size,
+    });
+
+    commands.spawn((
+        Mesh2d(meshes.add(Rectangle::default())),
+        MeshMaterial2d(material_handle),
+        Transform::from_scale(Vec3::new(screen_size.x, screen_size.y, 1.0)),
+        FullscreenQuad,
+    ));
+}
+
+/// Update fullscreen quad transforms when the primary window is resized.
+pub fn resize_fullscreen_quad(
+    primary_window: Single<&Window, With<PrimaryWindow>>,
+    mut transform: Single<&mut Transform, With<FullscreenQuad>>,
+) {
+    let size = Vec2::new(
+        primary_window.resolution.width(),
+        primary_window.resolution.height(),
+    );
+    transform.scale = Vec3::new(size.x, size.y, 1.0);
+}
+
+pub fn exit_app(mut exit: EventWriter<AppExit>) {
+    exit.write(AppExit::Success);
+}
+
+pub fn toggle_fullscreen(mut primary_window: Single<&mut Window, With<PrimaryWindow>>) {
+    primary_window.mode = match primary_window.mode {
+        WindowMode::BorderlessFullscreen(_) => WindowMode::Windowed,
+        WindowMode::Windowed => WindowMode::BorderlessFullscreen(MonitorSelection::Current),
+        WindowMode::Fullscreen(_, _) => WindowMode::BorderlessFullscreen(MonitorSelection::Current),
+    };
+}