PhysicsSystem.h

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#pragma once
 
#include <vector>
#include "../core/MathUtils.h"
#include "../core/Ray.h"
#include "AABB.h"
 
class ChunkManager;
 
struct RigidBody {
    Core::Vec3 m_ObjPos;
    Core::Vec3 m_ObjVelocity;
    Core::Vec3 m_ObjSize;  // Half extents (Width/2, Height/2, Length/2)
    bool m_bIsGrounded{false};
 
    AABB GetAABB(const Core::Vec3& newPos) const {
        return AABB(newPos - m_ObjSize, newPos + m_ObjSize);
    }
};
 
struct RayHit {
    Core::Vec3 m_objHitPoint{};
    Core::Vec3 m_objNormal{};
    float m_fDistance{0.0f};
    int m_iBlocKX{0}, m_iBlocKY{0}, m_iBlocKZ{0};
    bool m_bHit{false};
};
 
class PhysicsSystem {
public:
    static void Update(RigidBody& objRigidBody,
                       float fDeltaTime,
                       const ChunkManager& objChunkManager,
                       bool bFlyMode = false);
 
    static RayHit RayCast(const Core::Ray& objRay,
                          float fMaxDistance,
                          const ChunkManager& objChunkManager);
 
private:
    // Helper: AABBox-to-Voxel world collision
    static bool checkCollision(const AABB& objAABB, const ChunkManager& objChunkManager);
 
    // Helper: Linear Interpolation
    static float lerp(float a, float b, float t) { return a + (b - a) * t; }
};