Function determineFutureWeather

src/openrct2/world/Weather.cpp:344–369

* Calculates future weather development. * RCT2 implements this as discrete probability distributions dependent on month and climate * for nextWeather. The other weather parameters are then looked up depending only on the * next weather. */

     * next weather.
     */
    static void determineFutureWeather(uint32_t randomValue)
    {
        auto& objManager = GetContext()->GetObjectManager();
        auto* climateObj = objManager.GetLoadedObject<ClimateObject>(0);
        if (climateObj == nullptr)
            return;

        int32_t month = GetDate().GetMonth();
        const Pattern& pattern = climateObj->getPatternForMonth(month);

        // Generate a random index with values 0 up to randomBias-1
        // and choose weather from the distribution table accordingly
        const auto randomIndex = ((randomValue % 256) * pattern.randomBias) / 256;
        const auto nextWeather = pattern.distribution[randomIndex];

        auto& gameState = getGameState();
        gameState.weatherNext.weatherType = nextWeather;

        const auto& nextWeatherTrait = kWeatherTraits[EnumValue(nextWeather)];
        gameState.weatherNext.temperature = pattern.baseTemperature + nextWeatherTrait.temperatureDelta;
        gameState.weatherNext.weatherEffect = nextWeatherTrait.effectLevel;
        gameState.weatherNext.weatherGloom = nextWeatherTrait.gloomLevel;
        gameState.weatherNext.level = nextWeatherTrait.level;

        gameState.weatherUpdateTimer = 1920;
    }

    static void updateWeatherSound()
    {