OpenRCT2/src/openrct2/world/TileElement.h

/*****************************************************************************
 * Copyright (c) 2014-2018 OpenRCT2 developers
 *
 * For a complete list of all authors, please refer to contributors.md
 * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 is licensed under the GNU General Public License version 3.
 *****************************************************************************/

#pragma once

#include "../common.h"

#pragma pack(push, 1)
struct rct_tile_element_surface_properties
{
    uint8_t slope;        // 4 0xE0 Edge Style, 0x1F Slope
    uint8_t terrain;      // 5 0xE0 Terrain Style, 0x1F Water height
    uint8_t grass_length; // 6
    uint8_t ownership;    // 7
};
assert_struct_size(rct_tile_element_surface_properties, 4);

struct rct_tile_element_path_properties
{
    uint8_t type;      // 4 0xF0 Path type, 0x08 Ride sign, 0x04 Set when path is diagonal, 0x03 Rotation
    uint8_t additions; // 5
    uint8_t edges;     // 6
    union
    {
        uint8_t addition_status; // 7
        uint8_t ride_index;
    };
};
assert_struct_size(rct_tile_element_path_properties, 4);

struct rct_tile_element_track_properties
{
    uint8_t type; // 4
    union
    {
        struct
        {
            // The lower 4 bits are the track sequence.
            // The upper 4 bits are either station bits or on-ride photo bits.
            //
            // Station bits:
            // - Bit 8 marks green light
            // - Bit 5-7 are station index.
            //
            // On-ride photo bits:
            // - Bits 7 and 8 are never set
            // - Bits 5 and 6 are set when a vehicle triggers the on-ride photo and act like a countdown from 3.
            // - If any of the bits 5-8 are set, the game counts it as a photo being taken.
            uint8_t sequence; // 5.
            uint8_t colour;   // 6
        };
        uint16_t maze_entry; // 5
    };
    uint8_t ride_index; // 7
};
assert_struct_size(rct_tile_element_track_properties, 4);

struct rct_tile_element_scenery_properties
{
    uint8_t type;     // 4
    uint8_t age;      // 5
    uint8_t colour_1; // 6
    uint8_t colour_2; // 7
};
assert_struct_size(rct_tile_element_scenery_properties, 4);

struct rct_tile_element_entrance_properties
{
    uint8_t type;       // 4
    uint8_t index;      // 5
    uint8_t path_type;  // 6
    uint8_t ride_index; // 7
};
assert_struct_size(rct_tile_element_entrance_properties, 4);

struct rct_tile_element_wall_properties
{
    uint8_t type; // 4
    union
    {
        uint8_t colour_3;         // 5
        BannerIndex banner_index; // 5
    };
    uint8_t colour_1;  // 6 0b_2221_1111 2 = colour_2 (uses flags for rest of colour2), 1 = colour_1
    uint8_t animation; // 7 0b_dfff_ft00 d = direction, f = frame num, t = across track flag (not used)
};
assert_struct_size(rct_tile_element_wall_properties, 4);

struct rct_tile_element_scenerymultiple_properties
{
    uint16_t type;     // 4
    uint8_t colour[2]; // 6
};
assert_struct_size(rct_tile_element_scenerymultiple_properties, 4);

struct rct_tile_element_banner_properties
{
    BannerIndex index; // 4
    uint8_t position;  // 5
    uint8_t flags;     // 6
    uint8_t unused;    // 7
};
assert_struct_size(rct_tile_element_banner_properties, 4);

union rct_tile_element_properties
{
    rct_tile_element_surface_properties surface;
    rct_tile_element_path_properties path;
    rct_tile_element_track_properties track;
    rct_tile_element_scenery_properties scenery;
    rct_tile_element_entrance_properties entrance;
    rct_tile_element_wall_properties wall;
    rct_tile_element_scenerymultiple_properties scenerymultiple;
    rct_tile_element_banner_properties banner;
};
assert_struct_size(rct_tile_element_properties, 4);

enum
{
    TILE_ELEMENT_TYPE_SURFACE = (0 << 2),
    TILE_ELEMENT_TYPE_PATH = (1 << 2),
    TILE_ELEMENT_TYPE_TRACK = (2 << 2),
    TILE_ELEMENT_TYPE_SMALL_SCENERY = (3 << 2),
    TILE_ELEMENT_TYPE_ENTRANCE = (4 << 2),
    TILE_ELEMENT_TYPE_WALL = (5 << 2),
    TILE_ELEMENT_TYPE_LARGE_SCENERY = (6 << 2),
    TILE_ELEMENT_TYPE_BANNER = (7 << 2),
    // The corrupt element type is used for skipping drawing other following
    // elements on a given tile.
    TILE_ELEMENT_TYPE_CORRUPT = (8 << 2),
};

enum class TileElementType : uint8_t
{
    Surface = (0 << 2),
    Path = (1 << 2),
    Track = (2 << 2),
    SmallScenery = (3 << 2),
    Entrance = (4 << 2),
    Wall = (5 << 2),
    LargeScenery = (6 << 2),
    Banner = (7 << 2),
    Corrupt = (8 << 2),
};

struct SurfaceElement;
struct PathElement;
struct TrackElement;
struct SmallSceneryElement;
struct LargeSceneryElement;
struct WallElement;
struct EntranceElement;
struct BannerElement;
struct CorruptElement;

struct TileElementBase
{
    uint8_t type;             // 0
    uint8_t flags;            // 1
    uint8_t base_height;      // 2
    uint8_t clearance_height; // 3

    uint8_t GetType() const;
    void SetType(uint8_t newType);
    uint8_t GetDirection() const;
    void SetDirection(uint8_t direction);
    uint8_t GetDirectionWithOffset(uint8_t offset) const;
    bool IsLastForTile() const;
    bool IsGhost() const;
};


/**
 * Map element structure
 * size: 0x08
 */
struct rct_tile_element : public TileElementBase
{
    // TODO: Remove this field.
    rct_tile_element_properties properties;

    template<typename TType, TileElementType TClass>
    TType* as() const
    {
        return (TileElementType)GetType() == TClass ? (TType*)this : nullptr;
    }

public:
    SurfaceElement* AsSurface() const { return as<SurfaceElement, TileElementType::Surface>(); }
    PathElement* AsPath() const { return as<PathElement, TileElementType::Path>(); }
    TrackElement* AsTrack() const { return as<TrackElement, TileElementType::Track>(); }
    SmallSceneryElement* AsSmallScenery() const { return as<SmallSceneryElement, TileElementType::SmallScenery>(); }
    LargeSceneryElement* AsLargeScenery() const { return as<LargeSceneryElement, TileElementType::LargeScenery>(); }
    WallElement* AsWall() const { return as<WallElement, TileElementType::Wall>(); }
    EntranceElement* AsEntrance() const { return as<EntranceElement, TileElementType::Entrance>(); }
    BannerElement* AsBanner() const { return as<BannerElement, TileElementType::Banner>(); }
    CorruptElement* AsCorrupt() const { return as<CorruptElement, TileElementType::Corrupt>(); }
};
assert_struct_size(rct_tile_element, 8);

struct SurfaceElement : TileElementBase
{
    rct_tile_element_surface_properties temp;
};
assert_struct_size(SurfaceElement, 8);

struct PathElement : TileElementBase
{
    rct_tile_element_path_properties temp;
};
assert_struct_size(PathElement, 8);

struct TrackElement : TileElementBase
{
    rct_tile_element_track_properties temp;
};
assert_struct_size(TrackElement, 8);

struct SmallSceneryElement : TileElementBase
{
    uint8_t entryIndex; // 4
    uint8_t age;        // 5
    uint8_t colour_1;   // 6
    uint8_t colour_2;   // 7
public:
    uint8_t GetEntryIndex() const;
    void SetEntryIndex(uint8_t newIndex);
    uint8_t GetAge() const;
    void SetAge(uint8_t newAge);
    uint8_t GetSceneryQuadrant() const;
    void IncreaseAge(int32_t x, int32_t y);
};
assert_struct_size(SmallSceneryElement, 8);

struct LargeSceneryElement : TileElementBase
{
    rct_tile_element_scenerymultiple_properties temp;
};
assert_struct_size(LargeSceneryElement, 8);

struct WallElement : TileElementBase
{
    rct_tile_element_wall_properties temp;
public:
    uint8_t GetSlope() const;
};
assert_struct_size(WallElement, 8);

struct EntranceElement : TileElementBase
{
    rct_tile_element_entrance_properties temp;
};
assert_struct_size(EntranceElement, 8);

struct BannerElement : TileElementBase
{
    rct_tile_element_banner_properties temp;
};
assert_struct_size(BannerElement, 8);

struct CorruptElement : TileElementBase
{
    uint8_t pad[4];
};
assert_struct_size(CorruptElement, 8);


#pragma pack(pop)

enum
{
    TILE_ELEMENT_QUADRANT_SW,
    TILE_ELEMENT_QUADRANT_NW,
    TILE_ELEMENT_QUADRANT_NE,
    TILE_ELEMENT_QUADRANT_SE
};

enum
{
    TILE_ELEMENT_TYPE_FLAG_HIGHLIGHT = (1 << 6)
};

enum
{
    TILE_ELEMENT_DIRECTION_WEST,
    TILE_ELEMENT_DIRECTION_NORTH,
    TILE_ELEMENT_DIRECTION_EAST,
    TILE_ELEMENT_DIRECTION_SOUTH
};

enum
{
    TILE_ELEMENT_FLAG_GHOST = (1 << 4),
    TILE_ELEMENT_FLAG_BROKEN = (1 << 5),
    TILE_ELEMENT_FLAG_BLOCK_BRAKE_CLOSED = (1 << 5),
    TILE_ELEMENT_FLAG_INDESTRUCTIBLE_TRACK_PIECE = (1 << 6),
    TILE_ELEMENT_FLAG_BLOCKED_BY_VEHICLE = (1 << 6),
    TILE_ELEMENT_FLAG_LAST_TILE = (1 << 7)
};

enum
{
    ENTRANCE_TYPE_RIDE_ENTRANCE,
    ENTRANCE_TYPE_RIDE_EXIT,
    ENTRANCE_TYPE_PARK_ENTRANCE
};

enum
{
    ELEMENT_IS_ABOVE_GROUND = 1 << 0,
    ELEMENT_IS_UNDERGROUND = 1 << 1,
    ELEMENT_IS_UNDERWATER = 1 << 2,
};

enum
{
    MAP_ELEM_TRACK_SEQUENCE_GREEN_LIGHT = (1 << 7),
};

#define TILE_ELEMENT_QUADRANT_MASK 0b11000000
#define TILE_ELEMENT_TYPE_MASK 0b00111100
#define TILE_ELEMENT_DIRECTION_MASK 0b00000011

#define TILE_ELEMENT_COLOUR_MASK 0b00011111

#define MAP_ELEM_TRACK_SEQUENCE_STATION_INDEX_MASK 0b01110000
#define MAP_ELEM_TRACK_SEQUENCE_SEQUENCE_MASK 0b00001111
#define MAP_ELEM_TRACK_SEQUENCE_TAKING_PHOTO_MASK 0b11110000

int32_t tile_element_get_direction(const rct_tile_element* element);
int32_t tile_element_get_direction_with_offset(const rct_tile_element* element, uint8_t offset);
BannerIndex tile_element_get_banner_index(rct_tile_element* tileElement);
bool tile_element_is_ghost(const rct_tile_element* element);
bool tile_element_is_underground(rct_tile_element* tileElement);
bool tile_element_is_last_for_tile(const rct_tile_element* element);

// ~Oli414: The banner functions should probably be part of banner.
void tile_element_set_banner_index(rct_tile_element* tileElement, BannerIndex bannerIndex);
void tile_element_remove_banner_entry(rct_tile_element* tileElement);

uint8_t tile_element_get_ride_index(const rct_tile_element* tileElement);