Merge pull request #1 from pret/master

Update fork to match main fork.

1 files changed, 240 insertions, 0 deletions

diff --git a/src/field_ground_effect.c b/src/field_ground_effect.c
new file mode 100644
index 000000000..42862d0ff
--- /dev/null
+++ b/src/field_ground_effect.c
@@ -0,0 +1,240 @@
+#include "global.h"
+#include "field_ground_effect.h"
+#include "fieldmap.h"
+#include "metatile_behavior.h"
+
+extern u32 gUnknown_08376008[];
+
+void GetAllGroundEffectFlags_OnSpawn(struct MapObject *mapObj, u32 *flags)
+{
+    FieldObjectUpdateMetatileBehaviors(mapObj);
+    GetGroundEffectFlags_Reflection(mapObj, flags);
+    GetGroundEffectFlags_TallGrassOnSpawn(mapObj, flags);
+    GetGroundEffectFlags_LongGrassOnSpawn(mapObj, flags);
+    GetGroundEffectFlags_SandPile(mapObj, flags);
+    GetGroundEffectFlags_ShallowFlowingWater(mapObj, flags);
+    GetGroundEffectFlags_ShortGrass(mapObj, flags);
+    GetGroundEffectFlags_HotSprings(mapObj, flags);
+}
+
+void GetAllGroundEffectFlags_OnBeginStep(struct MapObject *mapObj, u32 *flags)
+{
+    FieldObjectUpdateMetatileBehaviors(mapObj);
+    GetGroundEffectFlags_Reflection(mapObj, flags);
+    GetGroundEffectFlags_TallGrassOnBeginStep(mapObj, flags);
+    GetGroundEffectFlags_LongGrassOnBeginStep(mapObj, flags);
+    GetGroundEffectFlags_Tracks(mapObj, flags);
+    GetGroundEffectFlags_SandPile(mapObj, flags);
+    GetGroundEffectFlags_ShallowFlowingWater(mapObj, flags);
+    GetGroundEffectFlags_Puddle(mapObj, flags);
+    GetGroundEffectFlags_ShortGrass(mapObj, flags);
+    GetGroundEffectFlags_HotSprings(mapObj, flags);
+}
+
+void GetAllGroundEffectFlags_OnFinishStep(struct MapObject *mapObj, u32 *flags)
+{
+    FieldObjectUpdateMetatileBehaviors(mapObj);
+    GetGroundEffectFlags_ShallowFlowingWater(mapObj, flags);
+    GetGroundEffectFlags_SandPile(mapObj, flags);
+    GetGroundEffectFlags_Puddle(mapObj, flags);
+    GetGroundEffectFlags_Ripple(mapObj, flags);
+    GetGroundEffectFlags_ShortGrass(mapObj, flags);
+    GetGroundEffectFlags_HotSprings(mapObj, flags);
+    GetGroundEffectFlags_Seaweed(mapObj, flags);
+    GetGroundEffectFlags_JumpLanding(mapObj, flags);
+}
+
+void FieldObjectUpdateMetatileBehaviors(struct MapObject *mapObj)
+{
+    mapObj->mapobj_unk_1F = MapGridGetMetatileBehaviorAt(mapObj->coords3.x, mapObj->coords3.y);
+    mapObj->mapobj_unk_1E = MapGridGetMetatileBehaviorAt(mapObj->coords2.x, mapObj->coords2.y);
+}
+
+void GetGroundEffectFlags_Reflection(struct MapObject *mapObj, u32 *flags)
+{
+    u32 reflectionFlags[2] = { 0x00000020, 0x00000010 };
+    u8 type = FieldObjectCheckForReflectiveSurface(mapObj);
+
+    if (type)
+    {
+        if (!mapObj->mapobj_bit_17)
+        {
+            mapObj->mapobj_bit_17 = 0;
+            mapObj->mapobj_bit_17 = 1;
+            *flags |= reflectionFlags[type - 1];
+        }
+    }
+    else
+    {
+        mapObj->mapobj_bit_17 = 0;
+    }
+}
+
+void GetGroundEffectFlags_TallGrassOnSpawn(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsTallGrass(mapObj->mapobj_unk_1E))
+        *flags |= 0x1;
+}
+
+void GetGroundEffectFlags_TallGrassOnBeginStep(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsTallGrass(mapObj->mapobj_unk_1E))
+        *flags |= 0x2;
+}
+
+void GetGroundEffectFlags_LongGrassOnSpawn(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsLongGrass(mapObj->mapobj_unk_1E))
+        *flags |= 0x4;
+}
+
+void GetGroundEffectFlags_LongGrassOnBeginStep(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsLongGrass(mapObj->mapobj_unk_1E))
+        *flags |= 0x8;
+}
+
+void GetGroundEffectFlags_Tracks(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsDeepSand(mapObj->mapobj_unk_1F))
+    {
+        *flags |= 0x100;
+    }
+    else if (MetatileBehavior_IsSandOrDeepSand(mapObj->mapobj_unk_1F)
+     || MetatileBehavior_IsUnusedFootprintMetatile(mapObj->mapobj_unk_1F))
+    {
+        *flags |= 0x80;
+    }
+}
+
+void GetGroundEffectFlags_SandPile(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsDeepSand(mapObj->mapobj_unk_1E)
+     && MetatileBehavior_IsDeepSand(mapObj->mapobj_unk_1F))
+    {
+        if (!mapObj->mapobj_bit_20)
+        {
+            mapObj->mapobj_bit_20 = 0;
+            mapObj->mapobj_bit_20 = 1;
+            *flags |= 0x800;
+        }
+    }
+    else
+    {
+        mapObj->mapobj_bit_20 = 0;
+    }
+}
+
+void GetGroundEffectFlags_ShallowFlowingWater(struct MapObject *mapObj, u32 *flags)
+{
+    if ((MetatileBehavior_IsShallowFlowingWater(mapObj->mapobj_unk_1E) && MetatileBehavior_IsShallowFlowingWater(mapObj->mapobj_unk_1F))
+     || (MetatileBehavior_IsPacifidlogLog(mapObj->mapobj_unk_1E) && MetatileBehavior_IsPacifidlogLog(mapObj->mapobj_unk_1F)))
+    {
+        if (!mapObj->mapobj_bit_19)
+        {
+            mapObj->mapobj_bit_19 = 0;
+            mapObj->mapobj_bit_19 = 1;
+            *flags |= 0x40;
+        }
+    }
+    else
+    {
+        mapObj->mapobj_bit_19 = 0;
+    }
+}
+
+void GetGroundEffectFlags_Puddle(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsPuddle(mapObj->mapobj_unk_1E)
+     && MetatileBehavior_IsPuddle(mapObj->mapobj_unk_1F))
+    {
+        *flags |= 0x400;
+    }
+}
+
+void GetGroundEffectFlags_Ripple(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_HasRipples(mapObj->mapobj_unk_1E))
+        *flags |= 0x200;
+}
+
+void GetGroundEffectFlags_ShortGrass(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsShortGrass(mapObj->mapobj_unk_1E)
+     && MetatileBehavior_IsShortGrass(mapObj->mapobj_unk_1F))
+    {
+        if (!mapObj->mapobj_bit_18)
+        {
+            mapObj->mapobj_bit_18 = 0;
+            mapObj->mapobj_bit_18 = 1;
+            *flags |= 0x20000;
+        }
+    }
+    else
+    {
+        mapObj->mapobj_bit_18 = 0;
+    }
+}
+
+void GetGroundEffectFlags_HotSprings(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsHotSprings(mapObj->mapobj_unk_1E)
+     && MetatileBehavior_IsHotSprings(mapObj->mapobj_unk_1F))
+    {
+        if (!mapObj->mapobj_bit_21)
+        {
+            mapObj->mapobj_bit_21 = 0;
+            mapObj->mapobj_bit_21 = 1;
+            *flags |= 0x40000;
+        }
+    }
+    else
+    {
+        mapObj->mapobj_bit_21 = 0;
+    }
+}
+
+void GetGroundEffectFlags_Seaweed(struct MapObject *mapObj, u32 *flags)
+{
+    if (MetatileBehavior_IsSeaweed(mapObj->mapobj_unk_1E))
+        *flags |= 0x80000;
+}
+
+void GetGroundEffectFlags_JumpLanding(struct MapObject *mapObj, u32 *flags)
+{
+    typedef bool8 (*MetatileFunc)(u8);
+
+    static const MetatileFunc metatileFuncs[] =
+    {
+        MetatileBehavior_IsTallGrass,
+        MetatileBehavior_IsLongGrass,
+        MetatileBehavior_IsPuddle,
+        MetatileBehavior_IsSurfableWaterOrUnderwater,
+        MetatileBehavior_IsShallowFlowingWater,
+        MetatileBehavior_IsATile,
+    };
+
+    static const u32 jumpLandingFlags[] =
+    {
+        0x00001000,  // Landing in tall grass
+        0x00002000,  // Landing in long grass
+        0x00004000,  // Landing on puddle
+        0x00008000,  // Landing on surfable water or underwater
+        0x00004000,  // Landing on shallow flowing water
+        0x00010000,  // Landing on any other type of ground
+    };
+
+    if (mapObj->mapobj_bit_5 && !mapObj->mapobj_bit_25)
+    {
+        u8 i;
+
+        for (i = 0; i < 6; i++)
+        {
+            if (metatileFuncs[i](mapObj->mapobj_unk_1E))
+            {
+                *flags |= jumpLandingFlags[i];
+                return;
+            }
+        }
+    }
+}