Added shadow toggle to weather structure.

include/field_weather.h

@@ -45,7 +45,8 @@ struct Weather
     s8 gammaTargetIndex;
     u8 gammaStepDelay;
     u8 gammaStepFrameCounter;
-    u16 fadeDestColor;
+    u16 fadeDestColor:15;
+    u16 noShadows:1; // Certain weathers require blend coeffs that do not work nice with shadows
     u8 palProcessingState;
     u8 fadeScreenCounter;
     bool8 readyForInit;

src/event_object_movement.c

@@ -8856,14 +8856,14 @@ static void GroundEffect_Shadow(struct ObjectEvent *objEvent, struct Sprite *spr
 static void DoFlaggedGroundEffects(struct ObjectEvent *objEvent, struct Sprite *sprite, u32 flags)
 {
     u8 i;
-
     if (ObjectEventIsFarawayIslandMew(objEvent) == TRUE && !ShouldMewShakeGrass(objEvent))
         return;
 
     for (i = 0; i < ARRAY_COUNT(sGroundEffectFuncs); i++, flags >>= 1)
         if (flags & 1)
             sGroundEffectFuncs[i](objEvent, sprite);
-    GroundEffect_Shadow(objEvent, sprite);
+    if (!gWeatherPtr->noShadows)
+      GroundEffect_Shadow(objEvent, sprite);
 }
 
 void filters_out_some_ground_effects(struct ObjectEvent *objEvent, u32 *flags)

src/field_effect_helpers.c

@@ -349,6 +349,7 @@ void UpdateShadowFieldEffect(struct Sprite *sprite)
         sprite->invisible = linkedSprite->invisible;
         if (!objectEvent->active
          || objectEvent->noShadow
+         || gWeatherPtr->noShadows
          || MetatileBehavior_IsPokeGrass(objectEvent->currentMetatileBehavior)
          || MetatileBehavior_IsSurfableWaterOrUnderwater(objectEvent->currentMetatileBehavior)
          || MetatileBehavior_IsSurfableWaterOrUnderwater(objectEvent->previousMetatileBehavior))

src/field_weather.c

@@ -255,6 +255,7 @@ static void Task_WeatherMain(u8 taskId)
 static void None_Init(void)
 {
     Weather_SetBlendCoeffs(8, 12); // Indoor shadows
+    gWeatherPtr->noShadows = FALSE;
     gWeatherPtr->gammaTargetIndex = 0;
     gWeatherPtr->gammaStepDelay = 0;
 }

src/field_weather_effect.c

@@ -95,6 +95,7 @@ static const struct SpriteTemplate sCloudSpriteTemplate =
 
 void Clouds_InitVars(void)
 {
+    gWeatherPtr->noShadows = FALSE;
     gWeatherPtr->gammaTargetIndex = 0;
     gWeatherPtr->gammaStepDelay = 20;
     gWeatherPtr->weatherGfxLoaded = FALSE;
@@ -156,6 +157,7 @@ void Sunny_InitVars(void)
     gWeatherPtr->gammaTargetIndex = 0;
     gWeatherPtr->gammaStepDelay = 20;
     Weather_SetBlendCoeffs(8, 12);
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Sunny_InitAll(void)
@@ -239,6 +241,7 @@ void Drought_InitVars(void)
     gWeatherPtr->weatherGfxLoaded = FALSE;
     gWeatherPtr->gammaTargetIndex = 0;
     gWeatherPtr->gammaStepDelay = 0;
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Drought_InitAll(void)
@@ -482,6 +485,7 @@ void Rain_InitVars(void)
     gWeatherPtr->gammaStepDelay = 20;
     SetRainStrengthFromSoundEffect(SE_RAIN);
     Weather_SetBlendCoeffs(8, 12); // preserve shadow darkness
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Rain_InitAll(void)
@@ -776,6 +780,7 @@ void Snow_InitVars(void)
     gWeatherPtr->targetSnowflakeSpriteCount = 16;
     gWeatherPtr->snowflakeVisibleCounter = 0;
     Weather_SetBlendCoeffs(8, 12); // preserve shadow darkness
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Snow_InitAll(void)
@@ -1052,6 +1057,7 @@ void Thunderstorm_InitVars(void)
     gWeatherPtr->thunderTriggered = FALSE;
     SetRainStrengthFromSoundEffect(SE_THUNDERSTORM);
     Weather_SetBlendCoeffs(8, 12); // preserve shadow darkness
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Thunderstorm_InitAll(void)
@@ -1081,6 +1087,7 @@ void Downpour_InitVars(void)
     gWeatherPtr->weatherGfxLoaded = FALSE;  // duplicate assignment
     SetRainStrengthFromSoundEffect(SE_DOWNPOUR);
     Weather_SetBlendCoeffs(8, 12); // preserve shadow darkness
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Downpour_InitAll(void)
@@ -1378,6 +1385,7 @@ void FogHorizontal_InitVars(void)
         gWeatherPtr->fogHScrollPosX = 0;
         Weather_SetBlendCoeffs(0, 16);
     }
+    gWeatherPtr->noShadows = TRUE; // TODO: Can fog be made compatible with shadows?
 }
 
 void FogHorizontal_InitAll(void)
@@ -1532,6 +1540,7 @@ void Ash_InitVars(void)
         Weather_SetBlendCoeffs(0, 12);
         // SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(64, 63)); // These aren't valid blend coefficients!
     }
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Ash_InitAll(void)
@@ -1748,6 +1757,7 @@ void FogDiagonal_InitVars(void)
         gWeatherPtr->fogDPosY = 0;
         Weather_SetBlendCoeffs(0, 16);
     }
+    gWeatherPtr->noShadows = TRUE;
 }
 
 void FogDiagonal_InitAll(void)
@@ -1961,6 +1971,7 @@ void Sandstorm_InitVars(void)
 
         Weather_SetBlendCoeffs(0, 16);
     }
+    gWeatherPtr->noShadows = TRUE; // TODO: Can sandstorm be compatible with shadows?
 }
 
 void Sandstorm_InitAll(void)
@@ -2248,6 +2259,7 @@ void Shade_InitVars(void)
     gWeatherPtr->gammaTargetIndex = 3;
     gWeatherPtr->gammaStepDelay = 20;
     Weather_SetBlendCoeffs(8, 12); // preserve shadow darkness
+    gWeatherPtr->noShadows = FALSE;
 }
 
 void Shade_InitAll(void)
@@ -2309,6 +2321,7 @@ void Bubbles_InitVars(void)
         gWeatherPtr->bubblesCoordsIndex = 0;
         gWeatherPtr->bubblesSpriteCount = 0;
     }
+    gWeatherPtr->noShadows = TRUE;
 }
 
 void Bubbles_InitAll(void)