1 files changed, 78 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..65dfc80
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,78 @@
+use bevy::{
+    asset::embedded_asset,
+    prelude::*,
+    render::render_resource::{AsBindGroup, ShaderType},
+};
+
+pub struct BlacklightPlugin;
+
+impl Plugin for BlacklightPlugin {
+    fn build(&self, app: &mut App) {
+        embedded_asset!(app, "../assets/shaders/blacklight_material.wgsl");
+        app.add_plugins(MaterialPlugin::<BlacklightMaterial>::default()).add_systems(Update, update_shader_blacklight_data);
+    }
+}
+
+#[derive(Component, Debug)]
+pub struct Blacklight;
+
+#[derive(Clone, Debug, ShaderType)]
+pub struct BlacklightData {
+    pub position: Vec3,
+    pub direction: Vec3,
+    pub color: Vec4,
+    pub range: f32,
+    pub radius: f32,
+}
+
+#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
+pub struct BlacklightMaterial {
+    #[storage(0, read_only)]
+    pub lights: Vec<BlacklightData>,
+    #[texture(1)]
+    #[sampler(2)]
+    pub base_texture: Option<Handle<Image>>,
+    pub alpha_mode: AlphaMode,
+}
+
+impl Default for BlacklightMaterial {
+    fn default() -> Self {
+        Self {
+            lights: vec![],
+            base_texture: None,
+            alpha_mode: AlphaMode::Blend,
+        }
+    }
+}
+
+impl Material for BlacklightMaterial {
+    fn fragment_shader() -> bevy::render::render_resource::ShaderRef {
+        "embedded://bevy_blacklight_material/../assets/shaders/blacklight_material.wgsl".into()
+    }
+
+    fn alpha_mode(&self) -> AlphaMode {
+        self.alpha_mode
+    }
+}
+
+fn update_shader_blacklight_data(
+    blacklight_query: Query<(&ViewVisibility, &GlobalTransform, &Transform, &SpotLight), With<Blacklight>>,
+    blacklight_material_query: Query<&Handle<BlacklightMaterial>>,
+    mut blacklight_materials: ResMut<Assets<BlacklightMaterial>>,
+) {
+    let light_data = blacklight_query
+        .iter()
+        .filter(|(visibility, _, _, _)| visibility.get())
+        .map(|(_, global_transform, transform, light)| BlacklightData {
+            position: global_transform.translation(),
+            direction: *global_transform.forward(),
+            color: light.color.to_srgba().to_vec4(),
+            range: light.range,
+            radius: light.radius,
+        })
+        .collect::<Vec<_>>();
+    for handle in blacklight_material_query.iter() {
+        let material = blacklight_materials.get_mut(handle).unwrap();
+        material.lights = light_data.clone();
+    }
+}