added process method to entity_manager to directly access components by an...

added process method to entity_manager to directly access components by an entity_handle; fixed decal blending

src/mirrage/ecs/include/mirrage/ecs/entity_manager.hpp

@@ -121,6 +121,8 @@ namespace mirrage::ecs {
 		auto get(Entity_handle entity) -> util::maybe<Entity_facet>;
 		auto get_handle(Entity_id id) const -> Entity_handle { return _handles.get(id); }
 		auto validate(Entity_handle entity) -> bool { return _handles.valid(entity); }
+		template <typename... Ts, typename F>
+		void process(Entity_handle entity, F&& callback);
 
 		// deferred to next call to process_queued_actions
 		void erase(Entity_handle entity);

src/mirrage/ecs/include/mirrage/ecs/entity_manager.hxx

@@ -30,6 +30,13 @@ namespace mirrage::ecs {
 		return it != _components_by_name.end() ? util::just(it->second) : util::nothing;
 	}
 
+	template <typename... Ts, typename F>
+	void Entity_manager::process(Entity_handle entity, F&& callback)
+	{
+		if(auto f = get(entity); f.is_some())
+			f.get_or_throw().process<Ts...>(std::forward<F>(callback));
+	}
+
 	template <typename C>
 	auto Entity_manager::list() -> Component_container<C>&
 	{
@@ -103,7 +110,8 @@ namespace mirrage::ecs {
 	template <typename T, typename... Args>
 	void Entity_facet::emplace(Args&&... args)
 	{
-		emplace_init<T>(+[](const T&) {}, std::forward<Args>(args)...);
+		emplace_init<T>(
+		        +[](const T&) {}, std::forward<Args>(args)...);
 	}
 
 	template <typename T, typename F, typename... Args>

src/mirrage/renderer/shader/decal.frag

@@ -87,7 +87,7 @@ void main() {
 	albedo_mat_id_out = albedo;
 	mat_data_out      = vec4(encode_normal(N), roughness, metallic);
 	color_out         = vec4(albedo.rgb * emissive_color.rgb
-	                         * emissive_power * emissive_color.a, albedo.a);
+	                         * emissive_power * emissive_color.a * albedo.a, albedo.a);
 	color_diffuse_out = color_out;
 }