openrw/rwengine/include/objects/ProjectileObject.hpp

#pragma once
#ifndef _PROJECTILEOBJECT_HPP_
#define _PROJECTILEOBJECT_HPP_
#include <engine/GameObject.hpp>
#include <data/WeaponData.hpp>
#include <bullet/btBulletDynamicsCommon.h>
#include <BulletCollision/CollisionDispatch/btGhostObject.h>

/**
 * @brief Implements weapon projectile (e.g. molotovs, RPGs etc.)
 */
class ProjectileObject : public GameObject
{
public:

	enum ProjectileType {
		Grenade,
		Molotov,
		RPG,
	};

	struct ProjectileInfo {
		ProjectileType type;
		glm::vec3 direction;
		float velocity;

		/** Time to dentonation or removal */
		float time;

		std::shared_ptr<WeaponData> weapon;
	};

private:

	ProjectileInfo _info;

	btSphereShape* _shape;

	btRigidBody* _body;

	/** Used for RPGs and Molotov collision detection */
	btPairCachingGhostObject* _ghostBody;

	bool _exploded;

	void checkPhysicsContact();
	void explode();
	void cleanup();

public:

	/**
	 * @brief ProjectileObject constructor
	 */
	ProjectileObject(GameWorld* world, const glm::vec3& position, const ProjectileInfo& info);

	~ProjectileObject();

	void tick(float dt);

	Type type() { return Projectile; }

	const ProjectileInfo& getProjectileInfo() const { return _info; }
};

#endif