feat: initial DX12 foundation framework

Engine/Components/Entity.cpp

@@ -0,0 +1,108 @@
+#include "Entity.h"
+#include "Script.h"
+#include "Transform.h"
+
+namespace XEngine::game_entity {
+
+namespace {
+
+utl::vector<transform::component>					transforms;
+utl::vector<script::component>						scripts;
+
+
+utl::vector<id::generation_type>					generations;
+utl::deque<entity_id>								free_ids;
+
+} // anonymous namespace
+
+
+entity
+create(entity_info info)
+{
+	assert(info.transform);
+	if (!info.transform) return entity{ };
+
+	entity_id id;
+
+	if (free_ids.size() > id::min_deleted_elements)
+	{
+		id = free_ids.front();
+		assert(!is_alive( id ));
+		free_ids.pop_front();
+		id = entity_id{ id::new_generation(id) };
+		++generations[id::index(id)];
+	}
+	else
+	{
+		id = entity_id{ (id::id_type)generations.size() };
+		generations.push_back(0);
+
+		transforms.emplace_back();
+		scripts.emplace_back();
+	}
+
+	const entity new_entity{ id };
+	const id::id_type index{ id::index(id) };
+
+
+	//Create Transform Component 
+	assert(!transforms[index].is_valid());
+	transforms[index] = transform::create(*info.transform, new_entity);
+	if (!transforms[index].is_valid()) return{ };
+
+
+	//Create Script Component
+	if (info.script && info.script->script_creator)
+	{
+		assert(!scripts[index].is_valid());
+		scripts[index] = script::create(*info.script, new_entity);
+		assert(scripts[index].is_valid());
+	}
+
+
+	return new_entity;
+
+}
+void
+remove(entity_id id)
+{
+	const id::id_type index{ id::index(id) };
+	assert(is_alive(id));
+	if (scripts[index].is_valid())
+	{
+		script::remove(scripts[index]);
+		scripts[index] = {};
+	}
+	transform::remove(transforms[index]);
+	transforms[index] = {};
+	free_ids.push_back(id);
+
+}
+
+bool
+is_alive(entity_id id)
+{
+	assert(id::is_valid(id));
+	const id::id_type index{ id::index(id) };
+	assert(index < generations.size());
+	return (generations[index] == id::generation(id) && transforms[index].is_valid());
+}
+
+transform::component
+entity::transform() const
+{
+	assert(is_alive(_id));
+	const id::id_type index{ id::index(_id) };
+	return transforms[index];
+}
+
+
+script::component
+entity::script() const
+{
+	assert(is_alive(_id));
+	const id::id_type index{ id::index(_id) };
+	return scripts[index];
+}
+
+}