[ACNL] Weather Stuff

Weather.cpp

/*
    Weather Values:
    0: Sky completely clear
    1: Few Clouds, but clear weather
    2: Dark sky/clouds to signify rain is coming, clear weather
    3: Sky completely filled with grey clouds, Light Rain
    4: Black clouds, Heavy Rain w/ Thunder+Lightning
    5: Sky completely filled with light grey clouds, Light Snow
    6: Black clouds, Heavy Snow, looks kinda 'foggy'
    7+: Invalid, Music doesn't play and weather is always clear

    Cherry Blossoms and Confetti have no weather ids
*/

static const u8 predetermined_weather[52][24] =
{
    {0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1},
    {1,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,1},
    {1,1,1,1,1,1,1,1,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1},
    {1,1,1,1,1,1,1,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {2,2,2,1,1,1,1,1,1,1,1,1,2,2,1,1,1,1,1,1,1,1,1,1},
    {2,2,2,2,1,1,2,2,2,1,1,2,2,2,2,2,2,1,1,1,1,2,2,2},
    {2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,1,1,1,1,2,2,2,2,2},
    {2,2,3,3,3,2,2,2,3,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {3,2,2,1,2,3,3,3,3,3,3,2,2,2,3,3,3,2,2,2,2,3,3,3},
    {3,3,3,2,2,3,3,2,2,2,3,3,3,3,3,2,2,2,2,3,3,3,3,3},
    {3,3,3,3,3,2,3,3,3,2,3,3,3,3,3,3,3,3,2,2,3,3,3,3},
    {3,3,3,4,4,3,3,4,4,4,4,3,3,3,3,3,2,2,3,3,3,3,3,3},
    {3,4,4,4,4,4,4,4,4,3,3,4,4,4,4,4,4,3,3,3,4,4,4,3},
    {4,4,4,4,4,4,4,4,4,4,4,4,4,4,3,3,3,2,2,3,3,3,4,4},
    {2,2,2,2,2,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,3},
    {1,1,1,1,1,1,1,1,1,2,2,3,3,2,2,2,2,2,2,2,2,2,2,2},
    {0,0,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,2,2,2,2},
    {3,3,3,2,2,2,2,2,2,1,1,1,1,1,1,1,0,0,0,1,1,1,1,2},
    {3,2,2,2,2,2,3,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {2,2,3,2,2,2,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1,0},
    {1,0,0,0,0,0,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {0,0,0,0,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {0,0,0,0,0,0,0,1,1,4,2,1,0,0,0,0,0,0,0,0,0,1,1,0},
    {1,1,0,0,0,1,1,1,4,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {2,2,1,2,2,2,3,3,3,4,4,3,3,3,3,3,3,3,3,3,3,3,3,3},
    {2,2,2,2,3,3,3,2,2,2,3,3,3,3,3,2,3,3,3,3,3,3,2,2},
    {2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,3},
    {3,3,2,2,2,3,3,2,2,2,1,1,2,2,2,2,2,2,2,2,2,2,2,2},
    {3,3,3,3,3,3,3,3,3,2,2,2,2,2,2,2,1,1,2,2,2,2,2,2},
    {4,4,3,3,3,2,2,3,2,2,2,2,2,2,2,2,2,2,1,1,2,2,2,2},
    {0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,0,0,0,0,0,1,1,1,1},
    {1,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,1},
    {2,2,2,2,1,1,2,2,2,1,1,2,2,2,2,2,2,1,1,1,1,2,2,2},
    {2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,1,1,1,1,2,2,2,2,2},
    {2,2,3,3,3,2,2,2,3,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {1,1,1,1,1,1,1,1,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1},
    {1,1,1,1,1,1,1,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {1,1,1,1,1,1,1,1,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1},
    {1,1,1,1,1,1,1,2,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1},
    {2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
};

//off_CurrentTime: pointer for the game's current time. 0xAD56B0 (EUR 1.5) 
u8 GetCurrentWeather(u32 off_CurrentTime) {
    /* This is current weather used by the game in the going to/coming from island 'cutscenes'. Uses normal weather values. May be used for other things too. It is usually 0x7 except where it's used.*/
    static const u32 off_WeatherForIslandCutscene = 0x95DFB0; //EUR 1.5
    u8 weathervalue;
    u8 savevalue;
    u8 islandCutsceneWeather;

    u8 room = GetRoomID();
    if (room == 0x5D || room == 0x99 || room == 0x9B) { //if Train, GardenManualImport, or GardenPlusUpdate
        return 0; //Clear weather
    }

    islandCutsceneWeather = *(u8 *)off_WeatherForIslandCutscene;
    if (islandCutsceneWeather != 7) //If it's not the Invalid ID
        return islandCutsceneWeather;

    room = GetRoomID();
    if(CheckRoomID(0x20000, room)) //Checks if room >= 0x67 && room <= 0x8D; All Island room ids
        savevalue = GetIslandWeatherByte(); //Haven't checked what function does, just assumption. Not Re'd

    else savevalue = GetWeatherByteFromSave(); //Gets weather from save (and other places too?). Not Re'd, has been step throuh
    
    weathervalue = *(u8 *)off_WeatherForIslandCutscene;
    if (weathervalue == 7) 
    {
        u8 hour = *(u8 *)(off_CurrentTime+7); //Get hour from u64 time value
        hour-=6;
        if (hour<0) //Checks if current time is between 12am and 5am.
            hour+=24; //If so, add 24 hrs

        if (savevalue < 52 && hour < 24) { //Checks: 1) weathervalue won't cause read from OOB in array, 2) hour is actually an hour in the day
            weathervalue = predetermined_weather[savevalue][hour];
        }
    }

    room = GetRoomID();
    if(CheckRoomID(0x20000, room)) //Checks if room >= 0x67 && room <= 0x8D; All Island room ids
        return weathervalue;

    /* This isn't a mistake, game checks twice ¯\_(ツ)_/¯ */
    room = GetRoomID();
    if(CheckRoomID(0x20000, room)) //Checks if room >= 0x67 && room <= 0x8D; All Island room ids
        return weathervalue;

    if (GetSeason(8) == 1) { //Checking if season is winter assumably. Not Re'd
        if (weathervalue == 3)
            weathervalue = 5; //Changes light rain to light snow

        else if (weathervalue == 4)
            weathervalue = 6; //Changes heavy rain to heavy snow
    }

    return weathervalue;
}