KColData.hh

#pragma once
 
#include "game/field/KCollisionTypes.hh"
 
#include <egg/math/BoundBox.hh>
#include <egg/math/Matrix.hh>
 
// Credit: em-eight/mkw
// Credit: stblr/Hanachan
 
namespace Kinoko::Field {
 
struct CollisionInfoPartial {
    EGG::BoundBox3f bbox;
    EGG::Vector3f tangentOff;
 
    void update(const EGG::Vector3f &offset) {
        bbox.min = bbox.min.minimize(offset);
        bbox.max = bbox.max.maximize(offset);
    }
};
 
struct CollisionInfo {
    EGG::BoundBox3f bbox;
    EGG::Vector3f tangentOff;
    EGG::Vector3f floorNrm;
    EGG::Vector3f wallNrm;
    EGG::Vector3f roadVelocity;
    f32 floorDist;
    f32 wallDist;
    f32 movingFloorDist;
    f32 perpendicularity;
 
    void updateFloor(f32 dist, const EGG::Vector3f &fnrm) {
        if (dist > floorDist) {
            floorDist = dist;
            floorNrm = fnrm;
        }
    }
 
    void updateWall(f32 dist, const EGG::Vector3f &fnrm) {
        if (dist > wallDist) {
            wallDist = dist;
            wallNrm = fnrm;
        }
    }
 
    void reset() {
        bbox.setZero();
        movingFloorDist = -std::numeric_limits<f32>::min();
        wallDist = -std::numeric_limits<f32>::min();
        floorDist = -std::numeric_limits<f32>::min();
        perpendicularity = 0.0f;
    }
 
    void update(f32 now_dist, const EGG::Vector3f &offset, const EGG::Vector3f &fnrm,
            u32 kclAttributeTypeBit);
    void transformInfo(CollisionInfo &rhs, const EGG::Matrix34f &mtx, const EGG::Vector3f &v);
};

class KColData {
public:
    enum class CollisionCheckType {
        Edge,
        Plane,
        Movement,
    };
 
    struct KCollisionPrism {
        KCollisionPrism();
        KCollisionPrism(f32 height, u16 posIndex, u16 faceNormIndex, u16 edge1NormIndex,
                u16 edge2NormIndex, u16 edge3NormIndex, u16 attribute);
 
        f32 height;
        u16 pos_i;
        u16 fnrm_i;
        u16 enrm1_i;
        u16 enrm2_i;
        u16 enrm3_i;
        u16 attribute;
    };
    STATIC_ASSERT(sizeof(KCollisionPrism) == 0x10);

    struct alignas(0x40) KCollisionPrismGeometry {
        EGG::Vector3f vtx;   
        EGG::Vector3f enrm1; 
        EGG::Vector3f enrm2; 
        EGG::Vector3f enrm3; 
        EGG::Vector3f fnrm;  
        f32 height;          
    };
    STATIC_ASSERT(sizeof(KCollisionPrismGeometry) == 0x40);
 
    KColData(const void *file);
    ~KColData();
 
    void narrowScopeLocal(const EGG::Vector3f &pos, f32 radius, KCLTypeMask mask);
    void narrowPolygon_EachBlock(const u16 *prismArray);
 
    void computeBBox();
    [[nodiscard]] bool checkPointCollision(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *flagsOut);
    [[nodiscard]] bool checkSphereCollision(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *flagsOut);
    [[nodiscard]] bool checkSphere(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *flagsOut);
    [[nodiscard]] bool checkSphereSingle(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *flagsOut);
 
    void lookupPoint(const EGG::Vector3f &pos, const EGG::Vector3f &prevPos, KCLTypeMask typeMask);
    void lookupSphere(f32 radius, const EGG::Vector3f &pos, const EGG::Vector3f &prevPos,
            KCLTypeMask typeMask);
    void lookupSphereCached(const EGG::Vector3f &p1, const EGG::Vector3f &p2, u32 typeMask,
            f32 radius);
 
    [[nodiscard]] const u16 *searchBlock(const EGG::Vector3f &pos);

    [[nodiscard]] const EGG::BoundBox3f &bbox() const {
        return m_bbox;
    }
 
    [[nodiscard]] u16 prismCache(u32 idx) const {
        return m_prismCache[idx];
    }
 
    [[nodiscard]] static EGG::Vector3f GetVertex(f32 height, const EGG::Vector3f &vertex1,
            const EGG::Vector3f &fnrm, const EGG::Vector3f &enrm3, const EGG::Vector3f &enrm);
 
private:
    void preloadPrismGeometry();
 
    template <CollisionCheckType Type>
    [[nodiscard]] bool checkCollision(u16 prismIdx, f32 *distOut, EGG::Vector3f *fnrmOut,
            u16 *flagsOut);
 
    [[nodiscard]] bool checkPointCollision(u16 prismIdx, f32 *distOut, EGG::Vector3f *fnrmOut,
            u16 *flagsOut, bool movement);
    [[nodiscard]] bool checkSphereMovement(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *attributeOut);
    [[nodiscard]] bool checkPointMovement(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *attributeOut);
    [[nodiscard]] bool checkPoint(f32 *distOut, EGG::Vector3f *fnrmOut, u16 *attributeOut);
 
    const void *m_posData;
    const void *m_nrmData;
    const void *m_prismData;
    const void *m_blockData;
    f32 m_prismThickness;
    EGG::Vector3f m_areaMinPos;
    u32 m_areaXWidthMask;    
    u32 m_areaYWidthMask;    
    u32 m_areaZWidthMask;    
    u32 m_blockWidthShift;   
    u32 m_areaXBlocksShift;  
    u32 m_areaXYBlocksShift; 
    f32 m_sphereRadius;      
    EGG::Vector3f m_pos;
    EGG::Vector3f m_prevPos;
    EGG::Vector3f m_movement;
    f32 m_radius;
    KCLTypeMask m_typeMask;
    const u16 *m_prismIter;
    EGG::BoundBox3f m_bbox;
    std::array<u16, 256> m_prismCache;
    u16 *m_prismCacheTop;
    u16 *m_cachedPrismArray;
    EGG::Vector3f m_cachedPos;
    f32 m_cachedRadius;

    owning_span<KCollisionPrismGeometry> m_prismGeometry;

    owning_span<u16> m_prismAttributes;
};
 
} // namespace Kinoko::Field