Method steamPuffsAnimationUpdate

src/OpenLoco/src/Vehicles/VehicleBody.cpp:927–1086

0x004AB688, 0x004AACA5

    // 0x004AB688, 0x004AACA5
    void VehicleBody::steamPuffsAnimationUpdate(const Vehicle& train, const CarUpdateState& carState, const int32_t unkDistance, uint8_t num, int32_t emitterHorizontalPos)
    {
        const auto* vehicleObject = getObject();
        VehicleBogie* frontBogie = carState.frontBogie;
        VehicleBogie* backBogie = carState.backBogie;
        if (frontBogie->hasBreakdownFlags(BreakdownFlags::brokenDown))
        {
            return;
        }

        Vehicle2* veh_2 = train.veh2;
        bool soundCode = false;
        if (veh_2->motorState == MotorState::accelerating || veh_2->motorState == MotorState::stoppedOnIncline)
        {
            soundCode = true;
        }
        bool tickCalc = true;
        if (veh_2->motorState != MotorState::stopped && veh_2->currentSpeed >= 1.0_mph)
        {
            tickCalc = false;
        }

        auto _var_44 = var_44;
        // Reversing
        if (has38Flags(Flags38::isReversed))
        {
            emitterHorizontalPos = -emitterHorizontalPos;
            _var_44 = -_var_44;
        }

        if (tickCalc && (soundCode == false))
        {
            if (ScenarioManager::getScenarioTicks() & 7)
            {
                return;
            }
        }
        else
        {
            if (unkDistance + (uint16_t)(_var_44 * 8) < std::numeric_limits<uint16_t>::max())
            {
                return;
            }
        }

        emitterHorizontalPos += 64;

        auto xyFactor = Math::Trigonometry::computeXYVector(vehicleObject->animation[num].emitterVerticalPos, spritePitch, spriteYaw);

        auto bogieDifference = backBogie->position - frontBogie->position;

        auto smokeLoc = bogieDifference * emitterHorizontalPos / 128 + frontBogie->position + World::Pos3(xyFactor.x, xyFactor.y, vehicleObject->animation[num].emitterVerticalPos);

        Exhaust::create(smokeLoc, vehicleObject->animation[num].objectId | (soundCode ? 0 : 0x80));
        if (soundCode == false)
        {
            return;
        }