Fix overworld snow weather + make overworld fog cause misty terrain

include/config/battle.h

@@ -170,6 +170,7 @@
 // Terrain settings
 #define B_TERRAIN_BG_CHANGE         TRUE       // If set to TRUE, terrain moves permanently change the default battle background until the effect fades.
 #define B_THUNDERSTORM_TERRAIN      TRUE       // If TRUE, overworld Thunderstorm generates Rain and Electric Terrain as in Gen 8.
+#define B_FOG_TERRAIN               TRUE       // If TRUE, overworld Fog generates Misty Terrain as in Gen 8.
 #define B_TERRAIN_TYPE_BOOST        GEN_LATEST // In Gen8, damage is boosted by 30% instead of 50%.
 #define B_SECRET_POWER_EFFECT       GEN_LATEST // Secret Power's effects change depending on terrain and generation. See GetSecretPowerMoveEffect.
 #define B_SECRET_POWER_ANIMATION    GEN_LATEST // Secret Power's animations change depending on terrain and generation.
@@ -204,6 +205,7 @@
 #define B_TRAINER_CLASS_POKE_BALLS      GEN_LATEST // In Gen7+, trainers will use certain types of Poké Balls depending on their trainer class.
 #define B_OBEDIENCE_MECHANICS           GEN_7      // In PLA+ (here Gen8+), obedience restrictions also apply to non-outsider Pokémon, albeit based on their level met rather than actual level
 #define B_USE_FROSTBITE                 FALSE      // In PLA, Frostbite replaces Freeze. Enabling this flag does the same here. Moves can still be cherry-picked to either Freeze or Frostbite. Freeze-Dry, Secret Power & Tri Attack depend on this config.
+#define B_OVERWORLD_SNOW                GEN_LATEST // In Gen9+, overworld Snow will summon snow instead of hail.
 
 // Animation Settings
 #define B_NEW_SWORD_PARTICLE            TRUE    // If set to TRUE, it updates Swords Dance's particle.

src/battle_message.c

@@ -1845,7 +1845,11 @@ const u16 gWeatherStartsStringIds[] =
     [WEATHER_SUNNY_CLOUDS]       = STRINGID_ITISRAINING,
     [WEATHER_SUNNY]              = STRINGID_ITISRAINING,
     [WEATHER_RAIN]               = STRINGID_ITISRAINING,
-    [WEATHER_SNOW]               = STRINGID_ITISRAINING,
+#if B_OVERWORLD_SNOW >= GEN_9
+    [WEATHER_SNOW]               = STRINGID_STARTEDSNOW,
+#else
+    [WEATHER_SNOW]               = STRINGID_STARTEDHAIL,
+#endif
     [WEATHER_RAIN_THUNDERSTORM]  = STRINGID_ITISRAINING,
     [WEATHER_FOG_HORIZONTAL]     = STRINGID_ITISRAINING,
     [WEATHER_VOLCANIC_ASH]       = STRINGID_ITISRAINING,

src/battle_util.c

@@ -4195,7 +4195,16 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             effect++;
         }
     #endif
-        break;
+    #if B_FOG_TERRAIN == TRUE
+        else if ((GetCurrentWeather() == WEATHER_FOG_HORIZONTAL || GetCurrentWeather() == WEATHER_FOG_DIAGONAL) && !(gFieldStatuses & STATUS_FIELD_MISTY_TERRAIN))
+        {
+            gFieldStatuses = (STATUS_FIELD_MISTY_TERRAIN | STATUS_FIELD_TERRAIN_PERMANENT);
+            gBattleCommunication[MULTISTRING_CHOOSER] = 0;
+            BattleScriptPushCursorAndCallback(BattleScript_OverworldTerrain);
+            effect++;
+        }
+    #endif
+    break;
     case ABILITYEFFECT_SWITCH_IN_WEATHER:
         gBattleScripting.battler = battler;
         if (!(gBattleTypeFlags & BATTLE_TYPE_RECORDED))
@@ -4228,6 +4237,21 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
                     effect++;
                 }
                 break;
+            case WEATHER_SNOW:
+                if (!(gBattleWeather & (B_WEATHER_HAIL | B_WEATHER_SNOW)))
+                {
+                    #if B_OVERWORLD_SNOW >= GEN_9
+                        gBattleWeather = B_WEATHER_SNOW;
+                        gBattleScripting.animArg1 = B_ANIM_SNOW_CONTINUES;
+                        effect++;
+                    #else  
+                        gBattleWeather = B_WEATHER_HAIL;
+                        gBattleScripting.animArg1 = B_ANIM_HAIL_CONTINUES;
+                        effect++;
+                    #endif
+
+                }
+                break;
             }
         }
         if (effect != 0)

src/field_weather.c

@@ -16,6 +16,7 @@
 #include "task.h"
 #include "trig.h"
 #include "gpu_regs.h"
+#include "field_camera.h"
 
 #define DROUGHT_COLOR_INDEX(color) ((((color) >> 1) & 0xF) | (((color) >> 2) & 0xF0) | (((color) >> 3) & 0xF00))
 
@@ -219,6 +220,7 @@ static void Task_WeatherInit(u8 taskId)
     // When the screen fades in, this is set to TRUE.
     if (gWeatherPtr->readyForInit)
     {
+        UpdateCameraPanning();
         sWeatherFuncs[gWeatherPtr->currWeather].initAll();
         gTasks[taskId].func = Task_WeatherMain;
     }
@@ -380,7 +382,6 @@ static void FadeInScreenWithWeather(void)
     case WEATHER_RAIN:
     case WEATHER_RAIN_THUNDERSTORM:
     case WEATHER_DOWNPOUR:
-    case WEATHER_SNOW:
     case WEATHER_SHADE:
         if (FadeInScreen_RainShowShade() == FALSE)
         {
@@ -402,6 +403,7 @@ static void FadeInScreenWithWeather(void)
             gWeatherPtr->palProcessingState = WEATHER_PAL_STATE_IDLE;
         }
         break;
+    case WEATHER_SNOW:
     case WEATHER_VOLCANIC_ASH:
     case WEATHER_SANDSTORM:
     case WEATHER_FOG_DIAGONAL:
@@ -772,7 +774,6 @@ void FadeScreen(u8 mode, s8 delay)
     case WEATHER_RAIN:
     case WEATHER_RAIN_THUNDERSTORM:
     case WEATHER_DOWNPOUR:
-    case WEATHER_SNOW:
     case WEATHER_FOG_HORIZONTAL:
     case WEATHER_SHADE:
     case WEATHER_DROUGHT:

src/field_weather_effect.c

@@ -768,7 +768,7 @@ void Snow_InitVars(void)
 {
     gWeatherPtr->initStep = 0;
     gWeatherPtr->weatherGfxLoaded = FALSE;
-    gWeatherPtr->targetColorMapIndex = 3;
+    gWeatherPtr->targetColorMapIndex = 0;
     gWeatherPtr->colorMapStepDelay = 20;
     gWeatherPtr->targetSnowflakeSpriteCount = 16;
     gWeatherPtr->snowflakeVisibleCounter = 0;
@@ -940,8 +940,7 @@ static void InitSnowflakeSpriteMovement(struct Sprite *sprite)
 
 static void WaitSnowflakeSprite(struct Sprite *sprite)
 {
-    // Timer is never incremented
-    if (gWeatherPtr->snowflakeTimer > 18)
+    if (++gWeatherPtr->snowflakeTimer > 18)
     {
         sprite->invisible = FALSE;
         sprite->callback = UpdateSnowflakeSprite;
@@ -970,32 +969,6 @@ static void UpdateSnowflakeSprite(struct Sprite *sprite)
         sprite->x = 242 - (gSpriteCoordOffsetX + sprite->centerToCornerVecX);
     else if (x > 242)
         sprite->x = -3 - (gSpriteCoordOffsetX + sprite->centerToCornerVecX);
-
-    y = (sprite->y + sprite->centerToCornerVecY + gSpriteCoordOffsetY) & 0xFF;
-    if (y > 163 && y < 171)
-    {
-        sprite->y = 250 - (gSpriteCoordOffsetY + sprite->centerToCornerVecY);
-        sprite->tPosY = sprite->y * 128;
-        sprite->tFallCounter = 0;
-        sprite->tFallDuration = 220;
-    }
-    else if (y > 242 && y < 250)
-    {
-        sprite->y = 163;
-        sprite->tPosY = sprite->y * 128;
-        sprite->tFallCounter = 0;
-        sprite->tFallDuration = 220;
-        sprite->invisible = TRUE;
-        sprite->callback = WaitSnowflakeSprite;
-    }
-
-    if (++sprite->tFallCounter == sprite->tFallDuration)
-    {
-        InitSnowflakeSpriteMovement(sprite);
-        sprite->y = 250;
-        sprite->invisible = TRUE;
-        sprite->callback = WaitSnowflakeSprite;
-    }
 }
 
 #undef tPosY