oot/include/z64bgcheck.h

#ifndef Z_BGCHECK_H
#define Z_BGCHECK_H

struct PlayState;
struct Actor;
struct DynaPolyActor;

#define COLPOLY_NORMAL_FRAC (1.0f / SHT_MAX)
#define COLPOLY_SNORMAL(x) ((s16)((x) * SHT_MAX))
#define COLPOLY_GET_NORMAL(n) ((n)*COLPOLY_NORMAL_FRAC)
#define COLPOLY_VIA_FLAG_TEST(vIA, flags) ((vIA) & (((flags)&7) << 13))
#define COLPOLY_VTX_INDEX(vI) ((vI)&0x1FFF)

#define DYNAPOLY_INVALIDATE_LOOKUP (1 << 0)

#define BGACTOR_NEG_ONE -1
#define BG_ACTOR_MAX 50
#define BGCHECK_SCENE BG_ACTOR_MAX
#define BGCHECK_Y_MIN -32000.0f
#define BGCHECK_XYZ_ABSMAX 32760.0f
#define BGCHECK_SUBDIV_OVERLAP 50
#define BGCHECK_SUBDIV_MIN 150.0f

#define FUNC_80041EA4_RESPAWN 5
#define FUNC_80041EA4_MOUNT_WALL 6
#define FUNC_80041EA4_STOP 8
#define FUNC_80041EA4_VOID_OUT 12

typedef struct {
    Vec3f scale;
    Vec3s rot;
    Vec3f pos;
} ScaleRotPos;

typedef struct {
    /* 0x00 */ u16 type;
    union {
        u16 vtxData[3];
        struct {
            /* 0x02 */ u16 flags_vIA; // 0xE000 is poly exclusion flags (xpFlags), 0x1FFF is vtxId
            /* 0x04 */ u16 flags_vIB; // 0xE000 is flags, 0x1FFF is vtxId
                                      // 0x2000 = poly IsConveyor surface
            /* 0x06 */ u16 vIC;
        };
    };
    /* 0x08 */ Vec3s normal; // Unit normal vector
                             // Value ranges from -0x7FFF to 0x7FFF, representing -1.0 to 1.0; 0x8000 is invalid

    /* 0x0E */ s16 dist; // Plane distance from origin along the normal
} CollisionPoly; // size = 0x10

typedef struct {
    /* 0x0 */ u16 setting; // camera setting described by CameraSettingType enum
    /* 0x2 */ s16 count; // only used when `bgCamFuncData` is a list of points used for crawlspaces
    /* 0x4 */ Vec3s* bgCamFuncData; // s16 data grouped in threes (ex. Vec3s), is usually of type `BgCamFuncData`, but can be a list of points of type `Vec3s` for crawlspaces
} BgCamInfo; // size = 0x8

typedef BgCamInfo CamData; // Todo: Zapd compatibility

// The structure used for all instances of s16 data from `BgCamInfo` with the exception of crawlspaces.
// See `Camera_Subj4` for Vec3s data usage in crawlspaces
typedef struct {
    /* 0x00 */ Vec3s pos;
    /* 0x06 */ Vec3s rot;
    /* 0x0C */ s16 fov;
    /* 0x0E */ union {
        s16 jfifId;
        s16 timer;
        s16 flags;
    };
    /* 0x10 */ s16 unk_10; // unused
} BgCamFuncData; // size = 0x12

// Macros for `WaterBox.properties`

#define WATERBOX_BGCAM_INDEX_SHIFT 0
#define WATERBOX_BGCAM_INDEX_MASK 0x000000FF
#define WATERBOX_BGCAM_INDEX(properties) \
    (((properties) >> WATERBOX_BGCAM_INDEX_SHIFT) & (WATERBOX_BGCAM_INDEX_MASK >> WATERBOX_BGCAM_INDEX_SHIFT))

#define WATERBOX_LIGHT_INDEX_SHIFT 8
#define WATERBOX_LIGHT_INDEX_MASK 0x00001F00
#define WATERBOX_LIGHT_INDEX(properties) \
    (((properties) >> WATERBOX_LIGHT_INDEX_SHIFT) & (WATERBOX_LIGHT_INDEX_MASK >> WATERBOX_LIGHT_INDEX_SHIFT))
#define WATERBOX_LIGHT_INDEX_NONE 0x1F // warns and defaults to 0

#define WATERBOX_ROOM_SHIFT 13
#define WATERBOX_ROOM_MASK 0x0007E000
#define WATERBOX_ROOM(properties) (((properties) >> WATERBOX_ROOM_SHIFT) & (WATERBOX_ROOM_MASK >> WATERBOX_ROOM_SHIFT))
#define WATERBOX_ROOM_ALL 0x3F // value for "room index" indicating "all rooms"

#define WATERBOX_FLAG_19_SHIFT 19
#define WATERBOX_FLAG_19 (1 << WATERBOX_FLAG_19_SHIFT)

#define WATERBOX_PROPERTIES(bgCamIndex, lightIndex, room, setFlag19)              \
    ((((bgCamIndex) << WATERBOX_BGCAM_INDEX_SHIFT) & WATERBOX_BGCAM_INDEX_MASK) | \
     (((lightIndex) << WATERBOX_LIGHT_INDEX_SHIFT) & WATERBOX_LIGHT_INDEX_MASK) | \
     (((room) << WATERBOX_ROOM_SHIFT) & WATERBOX_ROOM_MASK) | (((setFlag19) & 1) << WATERBOX_FLAG_19_SHIFT))

typedef struct {
    /* 0x00 */ s16 xMin;
    /* 0x02 */ s16 ySurface;
    /* 0x04 */ s16 zMin;
    /* 0x06 */ s16 xLength;
    /* 0x08 */ s16 zLength;
    /* 0x0C */ u32 properties;
} WaterBox; // size = 0x10

typedef enum {
    /*  0 */ FLOOR_TYPE_0,
    /*  1 */ FLOOR_TYPE_1,
    /*  2 */ FLOOR_TYPE_2,
    /*  3 */ FLOOR_TYPE_3,
    /*  4 */ FLOOR_TYPE_4,
    /*  5 */ FLOOR_TYPE_5,
    /*  6 */ FLOOR_TYPE_6,
    /*  7 */ FLOOR_TYPE_7,
    /*  8 */ FLOOR_TYPE_8,
    /*  9 */ FLOOR_TYPE_9,
    /* 10 */ FLOOR_TYPE_10,
    /* 11 */ FLOOR_TYPE_11,
    /* 12 */ FLOOR_TYPE_12
} FloorType;

typedef enum {
    /*  0 */ WALL_TYPE_0,
    /*  1 */ WALL_TYPE_1,
    /*  2 */ WALL_TYPE_2,
    /*  3 */ WALL_TYPE_3,
    /*  4 */ WALL_TYPE_4,
    /*  5 */ WALL_TYPE_5,
    /*  6 */ WALL_TYPE_6,
    /*  7 */ WALL_TYPE_7,
    /*  8 */ WALL_TYPE_8,
    /*  9 */ WALL_TYPE_9,
    /* 10 */ WALL_TYPE_10,
    /* 11 */ WALL_TYPE_11,
    /* 12 */ WALL_TYPE_12,
    /* 32 */ WALL_TYPE_MAX = 32
} WallType;

#define WALL_FLAG_0 (1 << 0)
#define WALL_FLAG_1 (1 << 1)
#define WALL_FLAG_2 (1 << 2)
#define WALL_FLAG_3 (1 << 3)
#define WALL_FLAG_4 (1 << 4)
#define WALL_FLAG_5 (1 << 5)
#define WALL_FLAG_6 (1 << 6)

typedef enum {
    /*  0 */ FLOOR_PROPERTY_0,
    /*  5 */ FLOOR_PROPERTY_5 = 5,
    /*  6 */ FLOOR_PROPERTY_6,
    /*  7 */ FLOOR_PROPERTY_7,
    /*  8 */ FLOOR_PROPERTY_8,
    /*  9 */ FLOOR_PROPERTY_9,
    /* 11 */ FLOOR_PROPERTY_11 = 11,
    /* 12 */ FLOOR_PROPERTY_12
} FloorProperty;

typedef enum {
    /*  0 */ SURFACE_SFX_TYPE_0,
    /*  1 */ SURFACE_SFX_TYPE_1,
    /*  2 */ SURFACE_SFX_TYPE_2,
    /*  3 */ SURFACE_SFX_TYPE_3,
    /*  4 */ SURFACE_SFX_TYPE_4,
    /*  5 */ SURFACE_SFX_TYPE_5,
    /*  6 */ SURFACE_SFX_TYPE_6,
    /*  7 */ SURFACE_SFX_TYPE_7,
    /*  8 */ SURFACE_SFX_TYPE_8,
    /*  9 */ SURFACE_SFX_TYPE_9,
    /* 10 */ SURFACE_SFX_TYPE_10,
    /* 11 */ SURFACE_SFX_TYPE_11,
    /* 12 */ SURFACE_SFX_TYPE_12,
    /* 13 */ SURFACE_SFX_TYPE_13,
    /* 14 */ SURFACE_SFX_TYPE_MAX
} SurfaceSfxType;

typedef enum {
    /*  0 */ FLOOR_EFFECT_0,
    /*  1 */ FLOOR_EFFECT_1,
    /*  2 */ FLOOR_EFFECT_2
} FloorEffect;

typedef enum {
    /*  0 */ CONVEYOR_SPEED_DISABLED,
    /*  1 */ CONVEYOR_SPEED_SLOW,
    /*  2 */ CONVEYOR_SPEED_MEDIUM,
    /*  3 */ CONVEYOR_SPEED_FAST,
    /*  4 */ CONVEYOR_SPEED_MAX
} ConveyorSpeed;

#define CONVEYOR_DIRECTION_TO_BINANG(conveyorDirection) ((conveyorDirection) * (0x10000 / 64))

typedef struct {
    u32 data[2];
} SurfaceType;

typedef struct {
    /* 0x00 */ Vec3s minBounds; // minimum coordinates of poly bounding box
    /* 0x06 */ Vec3s maxBounds; // maximum coordinates of poly bounding box
    /* 0x0C */ u16 numVertices;
    /* 0x10 */ Vec3s* vtxList;
    /* 0x14 */ u16 numPolygons;
    /* 0x18 */ CollisionPoly* polyList;
    /* 0x1C */ SurfaceType* surfaceTypeList;
    /* 0x20 */ BgCamInfo* bgCamList;
    /* 0x24 */ u16 numWaterBoxes;
    /* 0x28 */ WaterBox* waterBoxes;
} CollisionHeader; // original name: BGDataInfo

typedef struct {
    s16 polyId;
    u16 next; // next SSNode index
} SSNode;

typedef struct {
    u16 head; // first SSNode index
} SSList;

typedef struct {
    /* 0x00 */ u16 max;          // original name: short_slist_node_size
    /* 0x02 */ u16 count;        // original name: short_slist_node_last_index
    /* 0x04 */ SSNode* tbl;      // original name: short_slist_node_tbl
    /* 0x08 */ u8* polyCheckTbl; // points to an array of bytes, one per static poly. Zero initialized when starting a
                                 // bg check, and set to 1 if that poly has already been tested.
} SSNodeList;

typedef struct {
    SSNode* tbl;
    s32 count;
    s32 max;
} DynaSSNodeList;

typedef struct {
    SSList floor;
    SSList wall;
    SSList ceiling;
} StaticLookup;

typedef struct {
    u16 polyStartIndex;
    SSList ceiling;
    SSList wall;
    SSList floor;
} DynaLookup;

typedef struct {
    /* 0x00 */ struct Actor* actor;
    /* 0x04 */ CollisionHeader* colHeader;
    /* 0x08 */ DynaLookup dynaLookup;
    /* 0x10 */ u16 vtxStartIndex;
    /* 0x14 */ ScaleRotPos prevTransform;
    /* 0x34 */ ScaleRotPos curTransform;
    /* 0x54 */ Sphere16 boundingSphere;
    /* 0x5C */ f32 minY;
    /* 0x60 */ f32 maxY;
} BgActor; // size = 0x64

#define BGACTOR_IN_USE (1 << 0) // The bgActor entry is in use
#define BGACTOR_1 (1 << 1)
#define BGACTOR_COLLISION_DISABLED (1 << 2) // The collision of the bgActor is disabled
#define BGACTOR_CEILING_COLLISION_DISABLED (1 << 3) // The ceilings in the collision of the bgActor are ignored

typedef struct {
    /* 0x0000 */ u8 bitFlag;
    /* 0x0004 */ BgActor bgActors[BG_ACTOR_MAX];
    /* 0x138C */ u16 bgActorFlags[BG_ACTOR_MAX];
    /* 0x13F0 */ CollisionPoly* polyList;
    /* 0x13F4 */ Vec3s* vtxList;
    /* 0x13F8 */ DynaSSNodeList polyNodes;
    /* 0x1404 */ s32 polyNodesMax;
    /* 0x1408 */ s32 polyListMax;
    /* 0x140C */ s32 vtxListMax;
} DynaCollisionContext; // size = 0x1410

typedef struct CollisionContext {
    /* 0x00 */ CollisionHeader* colHeader; // scene's static collision
    /* 0x04 */ Vec3f minBounds;            // minimum coordinates of collision bounding box
    /* 0x10 */ Vec3f maxBounds;            // maximum coordinates of collision bounding box
    /* 0x1C */ Vec3i subdivAmount;         // x, y, z subdivisions of the scene's static collision
    /* 0x28 */ Vec3f subdivLength;         // x, y, z subdivision worldspace lengths
    /* 0x34 */ Vec3f subdivLengthInv;      // inverse of subdivision length
    /* 0x40 */ StaticLookup* lookupTbl;    // 3d array of length subdivAmount
    /* 0x44 */ SSNodeList polyNodes;
    /* 0x50 */ DynaCollisionContext dyna;
    /* 0x1460 */ u32 memSize; // Size of all allocated memory plus CollisionContext
} CollisionContext; // size = 0x1464

typedef struct {
    /* 0x00 */ struct PlayState* play;
    /* 0x04 */ struct CollisionContext* colCtx;
    /* 0x08 */ u16 xpFlags;
    /* 0x0C */ CollisionPoly** resultPoly;
    /* 0x10 */ f32 yIntersect;
    /* 0x14 */ Vec3f* pos;
    /* 0x18 */ s32* bgId;
    /* 0x1C */ struct Actor* actor;
    /* 0x20 */ u32 downChkFlags;
    /* 0x24 */ f32 chkDist;
    /* 0x28 */ DynaCollisionContext* dyna;
    /* 0x2C */ SSList* ssList;
} DynaRaycastDown;

typedef struct {
    /* 0x00 */ struct CollisionContext* colCtx;
    /* 0x04 */ u16 xpFlags;
    /* 0x08 */ DynaCollisionContext* dyna;
    /* 0x0C */ SSList* ssList;
    /* 0x10 */ Vec3f* posA;
    /* 0x14 */ Vec3f* posB;
    /* 0x18 */ Vec3f* posResult;
    /* 0x1C */ CollisionPoly** resultPoly;
    /* 0x20 */ s32 chkOneFace; // bccFlags & 0x8
    /* 0x24 */ f32* distSq;    // distance from posA to poly squared
    /* 0x28 */ f32 chkDist;    // distance from poly
} DynaLineTest;

#endif