Add pulsing effect when invulnerable/intangible, make airdodge make the player intangible. (#75)

Reviewed-on: #75
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/materials/fighter_material.rs

@@ -0,0 +1,77 @@
+use bevy::{gltf::GltfMaterialName, pbr::{ExtendedMaterial, MaterialExtension}, prelude::*, render::render_resource::AsBindGroup, shader::ShaderRef, world_serialization::WorldInstanceReady};
+
+pub type FighterMaterial = ExtendedMaterial<StandardMaterial, FighterMaterialExtension>;
+
+#[derive(Component)]
+pub struct FighterMesh {
+    pub fighter: Entity
+}
+
+#[derive(Asset, AsBindGroup, Reflect, Debug, Clone, Default)]
+pub struct FighterMaterialExtension {
+    #[uniform(100)]
+    status_color: LinearRgba,
+    #[uniform(100)]
+    status_color_intensity: f32,
+}
+
+const SHADER_ASSET_PATH: &str = "embedded://shinespark/shaders/fighter.wgsl";
+
+impl FighterMaterialExtension {
+    pub fn new(status_color: Color) -> Self {
+        Self {
+            status_color: status_color.into(),
+            status_color_intensity: 0.0,
+            ..default()
+        }
+    }
+
+    pub fn update_status_color(&mut self, status_color: LinearRgba, intensity: f32) {
+        self.status_color = status_color;
+        self.status_color_intensity = intensity;
+    }
+}
+
+impl MaterialExtension for FighterMaterialExtension {
+    fn fragment_shader() -> ShaderRef {
+        SHADER_ASSET_PATH.into()
+    }
+
+    fn deferred_fragment_shader() -> ShaderRef {
+        SHADER_ASSET_PATH.into()
+    }
+}
+
+pub fn bind_fighter_material(
+    scene_ready: On<WorldInstanceReady>,
+    mut commands: Commands,
+    children: Query<&Children>,
+    //color_override: Query<&ColorOverride>,
+    mesh_materials: Query<(Entity, &MeshMaterial3d<StandardMaterial>, &GltfMaterialName)>,
+    mut asset_materials: ResMut<Assets<FighterMaterial>>,
+    original_materials: Res<Assets<StandardMaterial>>,
+) {
+    for descendant in children.iter_descendants(scene_ready.entity) {
+        let Ok((entity, id, material_name)) = mesh_materials.get(descendant) else {
+            continue;
+        };
+
+        dbg!(material_name);
+
+        if !material_name.starts_with("Fighter_") {
+            continue;
+        }
+
+        let Some(original_material) = original_materials.get(id.id()) else {
+            continue;
+        };
+
+        commands.entity(entity).insert((MeshMaterial3d(asset_materials.add(ExtendedMaterial {
+            base: StandardMaterial {
+                // can be used in forward or deferred mode
+                ..original_material.clone()
+            },
+            extension: FighterMaterialExtension::new(bevy::color::palettes::css::BLUE.into())
+        })), FighterMesh { fighter: scene_ready.entity  }));
+    }
+}