OpenRCT2/src/openrct2/ride/thrill/Twist.cpp

/*****************************************************************************
 * Copyright (c) 2014-2020 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.
 *****************************************************************************/

#include "../../common.h"
#include "../../entity/EntityRegistry.h"
#include "../../interface/Viewport.h"
#include "../../paint/Paint.h"
#include "../../paint/Supports.h"
#include "../Ride.h"
#include "../RideEntry.h"
#include "../Track.h"
#include "../TrackPaint.h"
#include "../Vehicle.h"

/** rct2: 0x0076E5C9 */
static void paint_twist_structure(
    paint_session* session, const Ride* ride, uint8_t direction, int8_t xOffset, int8_t yOffset, uint16_t height)
{
    const TileElement* savedTileElement = static_cast<const TileElement*>(session->CurrentlyDrawnItem);

    rct_ride_entry* rideEntry = get_ride_entry(ride->subtype);
    Vehicle* vehicle = nullptr;

    if (rideEntry == nullptr)
    {
        return;
    }

    height += 7;

    if (ride->lifecycle_flags & RIDE_LIFECYCLE_ON_TRACK && ride->vehicles[0] != SPRITE_INDEX_NULL)
    {
        vehicle = GetEntity<Vehicle>(ride->vehicles[0]);

        session->InteractionType = ViewportInteractionItem::Entity;
        session->CurrentlyDrawnItem = vehicle;
    }

    uint32_t frameNum = (direction * 88) % 216;
    if (vehicle != nullptr)
    {
        frameNum += (vehicle->sprite_direction >> 3) << 4;
        frameNum += vehicle->Pitch;
        frameNum = frameNum % 216;
    }

    auto imageFlags = session->TrackColours[SCHEME_MISC];
    auto imageTemplate = ImageId(0, ride->vehicle_colours[0].Body, ride->vehicle_colours[0].Trim);
    if (imageFlags != IMAGE_TYPE_REMAP)
    {
        imageTemplate = ImageId::FromUInt32(imageFlags);
    }

    auto baseImageId = rideEntry->vehicles[0].base_image_id;
    auto structureFrameNum = frameNum % 24;
    auto imageId = imageTemplate.WithIndex(baseImageId + structureFrameNum);
    PaintAddImageAsParent(
        session, imageId, { xOffset, yOffset, height }, { 24, 24, 48 }, { xOffset + 16, yOffset + 16, height });

    if (session->DPI.zoom_level < ZoomLevel{ 1 } && ride->lifecycle_flags & RIDE_LIFECYCLE_ON_TRACK && vehicle != nullptr)
    {
        for (int32_t i = 0; i < vehicle->num_peeps; i += 2)
        {
            imageTemplate = ImageId(0, vehicle->peep_tshirt_colours[i], vehicle->peep_tshirt_colours[i + 1]);
            auto peepFrameNum = (frameNum + i * 12) % 216;
            imageId = imageId.WithIndex(baseImageId + 24 + peepFrameNum);
            PaintAddImageAsChild(
                session, imageId, { xOffset, yOffset, height }, { 24, 24, 48 }, { xOffset + 16, yOffset + 16, height });
        }
    }

    session->CurrentlyDrawnItem = savedTileElement;
    session->InteractionType = ViewportInteractionItem::Ride;
}

/** rct2: 0x0076D858 */
static void paint_twist(
    paint_session* session, const Ride* ride, uint8_t trackSequence, uint8_t direction, int32_t height,
    const TrackElement& trackElement)
{
    if (ride == nullptr)
        return;

    trackSequence = track_map_3x3[direction][trackSequence];

    const uint8_t edges = edges_3x3[trackSequence];

    uint32_t imageId;

    wooden_a_supports_paint_setup(session, (direction & 1), 0, height, session->TrackColours[SCHEME_MISC]);

    StationObject* stationObject = ride_get_station_object(ride);
    track_paint_util_paint_floor(session, edges, session->TrackColours[SCHEME_MISC], height, floorSpritesCork, stationObject);

    switch (trackSequence)
    {
        case 7:
            if (track_paint_util_has_fence(EDGE_SW, session->MapPosition, trackElement, ride, session->CurrentRotation))
            {
                imageId = SPR_FENCE_ROPE_SW | session->TrackColours[SCHEME_MISC];
                PaintAddImageAsParent(session, imageId, { 0, 0, height }, { 1, 28, 7 }, { 29, 0, height + 3 });
            }
            if (track_paint_util_has_fence(EDGE_SE, session->MapPosition, trackElement, ride, session->CurrentRotation))
            {
                imageId = SPR_FENCE_ROPE_SE | session->TrackColours[SCHEME_MISC];
                PaintAddImageAsParent(session, imageId, { 0, 0, height }, { 28, 1, 7 }, { 0, 29, height + 3 });
            }
            break;
        default:
            track_paint_util_paint_fences(
                session, edges, session->MapPosition, trackElement, ride, session->TrackColours[SCHEME_MISC], height,
                fenceSpritesRope, session->CurrentRotation);
            break;
    }

    switch (trackSequence)
    {
        case 1:
            paint_twist_structure(session, ride, direction, 32, 32, height);
            break;
        case 3:
            paint_twist_structure(session, ride, direction, 32, -32, height);
            break;
        case 5:
            paint_twist_structure(session, ride, direction, 0, -32, height);
            break;
        case 6:
            paint_twist_structure(session, ride, direction, -32, 32, height);
            break;
        case 7:
            paint_twist_structure(session, ride, direction, -32, -32, height);
            break;
        case 8:
            paint_twist_structure(session, ride, direction, -32, 0, height);
            break;
    }

    int32_t cornerSegments = 0;
    switch (trackSequence)
    {
        case 1:
            cornerSegments = SEGMENT_B4 | SEGMENT_C8 | SEGMENT_CC;
            break;
        case 3:
            cornerSegments = SEGMENT_CC | SEGMENT_BC | SEGMENT_D4;
            break;
        case 6:
            cornerSegments = SEGMENT_C8 | SEGMENT_B8 | SEGMENT_D0;
            break;
        case 7:
            cornerSegments = SEGMENT_D0 | SEGMENT_C0 | SEGMENT_D4;
            break;
    }

    paint_util_set_segment_support_height(session, cornerSegments, height + 2, 0x20);
    paint_util_set_segment_support_height(session, SEGMENTS_ALL & ~cornerSegments, 0xFFFF, 0);
    paint_util_set_general_support_height(session, height + 64, 0x20);
}

/**
 * rct2: 0x0076D658
 */
TRACK_PAINT_FUNCTION get_track_paint_function_twist(int32_t trackType)
{
    if (trackType != TrackElemType::FlatTrack3x3)
    {
        return nullptr;
    }

    return paint_twist;
}