Program Listing for File physics_system.h

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#pragma once

#include "core/physics/debug_drawer.h"
#include "entity.h"
#include "framework/system.h"

#include "btBulletDynamicsCommon.h"
#include "BulletCollision/CollisionDispatch/btGhostObject.h"

enum PhysicsMaterial
{
    Air = 0,
    Water = 1,
    Wood = 2,
    End
};

struct PhysicsMaterialData
{
    float restitution = 1.0f;
    float friction = 1.0f;
    float specificGravity = 1.0f;
};

class PhysicsSystem : public System
{
    Ptr<btDynamicsWorld> m_DynamicsWorld;

    Ptr<btBroadphaseInterface> m_Broadphase;

    Ptr<btCollisionDispatcher> m_Dispatcher;

    Ptr<btConstraintSolver> m_Solver;

    Ptr<btDefaultCollisionConfiguration> m_CollisionConfiguration;

    Ptr<btGhostPairCallback> m_GhostPairCallback;

    DebugDrawer m_DebugDrawer;

    Vector<PhysicsMaterialData> m_PhysicsMaterialTable;
    String m_PhysicsMaterialNames;

    PhysicsSystem();

    void assignPhysicsMaterials();

public:
    static PhysicsSystem* GetSingleton();

    static void InternalTickCallback(btDynamicsWorld* const world, btScalar const timeStep);

    virtual ~PhysicsSystem();

    bool initialize(const JSON::json& systemData) override;

    void addRigidBody(btRigidBody* body, int group, int mask);
    void removeRigidBody(btRigidBody* rigidBody);

    void addCollisionObject(btCollisionObject* body, int group, int mask);
    void removeCollisionObject(btCollisionObject* collisionObject);

    const PhysicsMaterialData& getMaterialData(PhysicsMaterial material);
    const char* getMaterialNames();

    btCollisionWorld::AllHitsRayResultCallback reportAllRayHits(const btVector3& m_From, const btVector3& m_To);
    btCollisionWorld::ClosestRayResultCallback reportClosestRayHits(const btVector3& m_From, const btVector3& m_To);

    void debugDrawComponent(const btTransform& worldTransform, const btCollisionShape* shape, const btVector3& color);

    void update(float deltaMilliseconds) override;
};