Objects can now be placed under tiles that have non-block collision

source/game/StarObjectDatabase.cpp

@@ -32,9 +32,9 @@ bool ObjectOrientation::placementValid(World const* world, Vec2I const& position
   if (!world)
     return false;
 
-  for (auto space : spaces) {
+  for (Vec2I space : spaces) {
     space += position;
-    if (world->tileIsOccupied(space, TileLayer::Foreground) || world->isTileProtected(space))
+    if (world->tileIsOccupied(space, TileLayer::Foreground, false, true) || world->isTileProtected(space))
       return false;
   }
   return true;

source/game/StarWorldClient.cpp

@@ -238,10 +238,16 @@ EntityPtr WorldClient::findEntityAtTile(Vec2I const& pos, EntityFilterOf<TileEnt
   return m_entityMap->findEntityAtTile(pos, entityFilter);
 }
 
-bool WorldClient::tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral) const {
+bool WorldClient::tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral, bool checkCollision) const {
   if (!inWorld())
     return false;
-  return WorldImpl::tileIsOccupied(m_tileArray, m_entityMap, pos, layer, includeEphemeral);
+  return WorldImpl::tileIsOccupied(m_tileArray, m_entityMap, pos, layer, includeEphemeral, checkCollision);
+}
+
+CollisionKind WorldClient::tileCollisionKind(Vec2I const& pos) const {
+  if (!inWorld())
+    return CollisionKind::Null;
+  return WorldImpl::tileCollisionKind(m_tileArray, m_entityMap, pos);
 }
 
 void WorldClient::forEachCollisionBlock(RectI const& region, function<void(CollisionBlock const&)> const& iterator) const {

source/game/StarWorldClient.hpp

@@ -63,7 +63,8 @@ public:
   EntityPtr findEntity(RectF const& boundBox, EntityFilter entityFilter) const override;
   EntityPtr findEntityLine(Vec2F const& begin, Vec2F const& end, EntityFilter entityFilter) const override;
   EntityPtr findEntityAtTile(Vec2I const& pos, EntityFilterOf<TileEntity> entityFilter) const override;
-  bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false) const override;
+  bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false, bool checkCollision = false) const override;
+  CollisionKind tileCollisionKind(Vec2I const& pos) const override;
   void forEachCollisionBlock(RectI const& region, function<void(CollisionBlock const&)> const& iterator) const override;
   bool isTileConnectable(Vec2I const& pos, TileLayer layer, bool tilesOnly = false) const override;
   bool pointTileCollision(Vec2F const& point, CollisionSet const& collisionSet = DefaultCollisionSet) const override;

source/game/StarWorldImpl.hpp

@@ -21,7 +21,11 @@ namespace Star {
 namespace WorldImpl {
   template <typename TileSectorArray>
   bool tileIsOccupied(shared_ptr<TileSectorArray> const& tileSectorArray, EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, bool includeEphemeral);
+      Vec2I const& pos, TileLayer layer, bool includeEphemeral, bool checkCollision = false);
+
+  template <typename TileSectorArray>
+  CollisionKind tileCollisionKind(shared_ptr<TileSectorArray> const& tileSectorArray, EntityMapPtr const& entityMap,
+    Vec2I const& pos);
 
   template <typename TileSectorArray>
   bool rectTileCollision(shared_ptr<TileSectorArray> const& tileSectorArray, RectI const& region, bool solidCollision);
@@ -38,13 +42,13 @@ namespace WorldImpl {
 
   template <typename GetTileFunction>
   bool canPlaceMaterial(EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, GetTileFunction& getTile);
+      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, bool allowTileOverlap, GetTileFunction& getTile);
   // returns true if this material could be placed if in the same batch other
   // tiles can be placed
   // that connect to it
   template <typename GetTileFunction>
   bool perhapsCanPlaceMaterial(EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, GetTileFunction& getTile);
+      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, bool allowTileOverlap, GetTileFunction& getTile);
   template <typename GetTileFunction>
   bool canPlaceMaterialColorVariant(Vec2I const& pos, TileLayer layer, MaterialColorVariant color, GetTileFunction& getTile);
   template <typename GetTileFunction>
@@ -80,11 +84,18 @@ namespace WorldImpl {
 
   template <typename TileSectorArray>
   bool tileIsOccupied(shared_ptr<TileSectorArray> const& tileSectorArray, EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, bool includeEphemeral) {
+      Vec2I const& pos, TileLayer layer, bool includeEphemeral, bool checkCollision) {
+    auto& tile = tileSectorArray->tile(pos);
     if (layer == TileLayer::Foreground)
-      return tileSectorArray->tile(pos).foreground != EmptyMaterialId || entityMap->tileIsOccupied(pos, includeEphemeral);
+      return (checkCollision ? tile.collision >= CollisionKind::Dynamic : tile.foreground != EmptyMaterialId) || entityMap->tileIsOccupied(pos, includeEphemeral);
     else
-      return tileSectorArray->tile(pos).background != EmptyMaterialId;
+      return tile.background != EmptyMaterialId;
+  }
+
+  template <typename TileSectorArray>
+  CollisionKind tileCollisionKind(shared_ptr<TileSectorArray> const& tileSectorArray, EntityMapPtr const& entityMap,
+    Vec2I const& pos) {
+    return tileSectorArray->tile(pos).collision;
   }
 
   template <typename TileSectorArray>
@@ -210,7 +221,7 @@ namespace WorldImpl {
 
   template <typename GetTileFunction>
   bool canPlaceMaterial(EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, GetTileFunction& getTile) {
+      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, bool allowTileOverlap, GetTileFunction& getTile) {
     auto materialDatabase = Root::singleton().materialDatabase();
 
     if (!isRealMaterial(material))
@@ -239,26 +250,26 @@ namespace WorldImpl {
     if (!materialDatabase->canPlaceInLayer(material, layer))
       return false;
 
+    auto& tile = getTile(pos);
     if (layer == TileLayer::Background) {
-      if (getTile(pos).background != EmptyMaterialId)
+      if (tile.background != EmptyMaterialId && tile.background != ObjectPlatformMaterialId)
         return false;
 
       // Can attach background blocks to other background blocks, *or* the
       // foreground block in front of it.
-      if (!isAdjacentToConnectable(pos, 1, false)
+      if (!isAdjacentToConnectable(pos, 1, false) && !isConnectableMaterial(tile.foreground))
-          && !isConnectableMaterial(getTile({pos[0], pos[1]}).foreground))
         return false;
     } else {
-      if (getTile(pos).foreground != EmptyMaterialId)
+      if (tile.foreground != EmptyMaterialId && tile.foreground != ObjectPlatformMaterialId)
         return false;
 
-      if (entityMap->tileIsOccupied(pos))
+      if (!allowTileOverlap && entityMap->tileIsOccupied(pos))
         return false;
 
-      if (!allowEntityOverlap && entityMap->spaceIsOccupied(RectF::withSize(Vec2F(pos), Vec2F(1, 1))))
+      if (!allowEntityOverlap && entityMap->spaceIsOccupied(RectF::withSize(Vec2F(pos), Vec2F(0.999f, 0.999f))))
         return false;
 
-      if (!isAdjacentToConnectable(pos, 1, true) && !isConnectableMaterial(getTile({pos[0], pos[1]}).background))
+      if (!isAdjacentToConnectable(pos, 1, true) && !isConnectableMaterial(tile.background))
         return false;
     }
 
@@ -267,7 +278,7 @@ namespace WorldImpl {
 
   template <typename GetTileFunction>
   bool perhapsCanPlaceMaterial(EntityMapPtr const& entityMap,
-      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, GetTileFunction& getTile) {
+      Vec2I const& pos, TileLayer layer, MaterialId material, bool allowEntityOverlap, bool allowTileOverlap, GetTileFunction& getTile) {
     auto materialDatabase = Root::singleton().materialDatabase();
 
     if (!isRealMaterial(material))
@@ -276,17 +287,18 @@ namespace WorldImpl {
     if (!materialDatabase->canPlaceInLayer(material, layer))
       return false;
 
+    auto& tile = getTile(pos);
     if (layer == TileLayer::Background) {
-      if (getTile(pos).background != EmptyMaterialId)
+      if (tile.background != EmptyMaterialId && tile.background != ObjectPlatformMaterialId)
         return false;
     } else {
-      if (getTile(pos).foreground != EmptyMaterialId)
+      if (tile.foreground != EmptyMaterialId && tile.foreground != ObjectPlatformMaterialId)
         return false;
 
-      if (entityMap->tileIsOccupied(pos))
+      if (!allowTileOverlap && entityMap->tileIsOccupied(pos))
         return false;
 
-      if (!allowEntityOverlap && entityMap->spaceIsOccupied(RectF::withSize(Vec2F(pos), Vec2F(1, 1))))
+      if (!allowEntityOverlap && entityMap->spaceIsOccupied(RectF::withSize(Vec2F(pos), Vec2F(0.999f, 0.999f))))
         return false;
     }
 
@@ -321,9 +333,10 @@ namespace WorldImpl {
     bool perhaps = false;
     
     if (auto placeMaterial = modification.ptr<PlaceMaterial>()) {
-      perhaps = WorldImpl::perhapsCanPlaceMaterial(entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, getTile);
+      bool allowTileOverlap = placeMaterial->collisionOverride != TileCollisionOverride::None && collisionKindFromOverride(placeMaterial->collisionOverride) < CollisionKind::Dynamic;
+      perhaps = WorldImpl::perhapsCanPlaceMaterial(entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, allowTileOverlap, getTile);
       if (perhaps)
-        good = WorldImpl::canPlaceMaterial(entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, getTile);
+        good = WorldImpl::canPlaceMaterial(entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, allowTileOverlap, getTile);
     } else if (auto placeMod = modification.ptr<PlaceMod>()) {
       good = WorldImpl::canPlaceMod(pos, placeMod->layer, placeMod->mod, getTile);
     } else if (auto placeMaterialColor = modification.ptr<PlaceMaterialColor>()) {

source/game/StarWorldServer.cpp

@@ -756,10 +756,15 @@ EntityPtr WorldServer::findEntityAtTile(Vec2I const& pos, EntityFilterOf<TileEnt
   return m_entityMap->findEntityAtTile(pos, entityFilter);
 }
 
-bool WorldServer::tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral) const {
+bool WorldServer::tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral, bool checkCollision) const {
-  return WorldImpl::tileIsOccupied(m_tileArray, m_entityMap, pos, layer, includeEphemeral);
+  return WorldImpl::tileIsOccupied(m_tileArray, m_entityMap, pos, layer, includeEphemeral, checkCollision);
 }
 
+CollisionKind WorldServer::tileCollisionKind(Vec2I const& pos) const {
+  return WorldImpl::tileCollisionKind(m_tileArray, m_entityMap, pos);
+}
+
+
 void WorldServer::forEachCollisionBlock(RectI const& region, function<void(CollisionBlock const&)> const& iterator) const {
   const_cast<WorldServer*>(this)->freshenCollision(region);
   m_tileArray->tileEach(region, [iterator](Vec2I const& pos, ServerTile const& tile) {
@@ -1348,7 +1353,8 @@ TileModificationList WorldServer::doApplyTileModifications(TileModificationList
       continue;
 
     if (auto placeMaterial = modification.ptr<PlaceMaterial>()) {
-      if (!WorldImpl::canPlaceMaterial(m_entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, m_tileGetterFunction))
+      bool allowTileOverlap = placeMaterial->collisionOverride != TileCollisionOverride::None && collisionKindFromOverride(placeMaterial->collisionOverride) < CollisionKind::Dynamic;
+      if (!WorldImpl::canPlaceMaterial(m_entityMap, pos, placeMaterial->layer, placeMaterial->material, allowEntityOverlap, allowTileOverlap, m_tileGetterFunction))
         continue;
 
       ServerTile* tile = m_tileArray->modifyTile(pos);
@@ -1498,15 +1504,22 @@ void WorldServer::updateTileEntityTiles(TileEntityPtr const& entity, bool removi
 
     ServerTile* tile = m_tileArray->modifyTile(pos);
     if (tile) {
-      tile->foreground = EmptyMaterialId;
+      bool updated = false;
-      tile->foregroundMod = NoModId;
+      if (tile->foreground == materialSpace.material) {
-      tile->rootSource = {};
+        tile->foreground = EmptyMaterialId;
-      if (tile->updateCollision(materialDatabase->materialCollisionKind(tile->foreground))) {
+        tile->foregroundMod = NoModId;
+        tile->rootSource = {};
+        updated = true;
+      }
+      if (tile->collision == materialDatabase->materialCollisionKind(materialSpace.material)
+        && tile->updateCollision(materialSpace.prevCollision.value(CollisionKind::None))) {
         m_liquidEngine->visitLocation(pos);
         m_fallingBlocksAgent->visitLocation(pos);
-        dirtyCollision(RectI::withSize(pos, {1, 1}));
+        dirtyCollision(RectI::withSize(pos, { 1, 1 }));
+        updated = true;
       }
-      queueTileUpdates(pos);
+      if (updated)
+        queueTileUpdates(pos);
     }
   }
 
@@ -1515,24 +1528,37 @@ void WorldServer::updateTileEntityTiles(TileEntityPtr const& entity, bool removi
 
   } else {
     // add new material spaces and update the known material spaces entry
+    List<MaterialSpace> passedSpaces;
     for (auto const& materialSpace : newMaterialSpaces) {
       Vec2I pos = materialSpace.space + entity->tilePosition();
 
+      bool updated = false;
+      bool updatedCollision = false;
       ServerTile* tile = m_tileArray->modifyTile(pos);
-      if (tile) {
+      if (tile && (tile->foreground == EmptyMaterialId || tile->foreground == materialSpace.material)) {
         tile->foreground = materialSpace.material;
         tile->foregroundMod = NoModId;
         if (isRealMaterial(materialSpace.material))
           tile->rootSource = entity->tilePosition();
-        if (tile->updateCollision(materialDatabase->materialCollisionKind(tile->foreground))) {
+        passedSpaces.emplaceAppend(materialSpace).prevCollision.emplace(tile->collision);
-          m_liquidEngine->visitLocation(pos);
+        updatedCollision = tile->updateCollision(materialDatabase->materialCollisionKind(tile->foreground));
-          m_fallingBlocksAgent->visitLocation(pos);
+        updated = true;
-          dirtyCollision(RectI::withSize(pos, {1, 1}));
+        passedSpaces.emplaceAppend(materialSpace);
-        }
-        queueTileUpdates(pos);
       }
+      else if (tile && tile->collision < CollisionKind::Dynamic) {
+        passedSpaces.emplaceAppend(materialSpace).prevCollision.emplace(tile->collision);
+        updatedCollision = tile->updateCollision(materialDatabase->materialCollisionKind(materialSpace.material));
+        updated = true;
+      }
+      if (updatedCollision) {
+        m_liquidEngine->visitLocation(pos);
+        m_fallingBlocksAgent->visitLocation(pos);
+        dirtyCollision(RectI::withSize(pos, { 1, 1 }));
+      }
+      if (updated)
+        queueTileUpdates(pos);
     }
-    spaces.materials = move(newMaterialSpaces);
+    spaces.materials = move(passedSpaces);
 
     // add new roots and update known roots entry
     for (auto const& rootPos : newRoots) {

source/game/StarWorldServer.hpp

@@ -144,7 +144,8 @@ public:
   EntityPtr findEntity(RectF const& boundBox, EntityFilter entityFilter) const override;
   EntityPtr findEntityLine(Vec2F const& begin, Vec2F const& end, EntityFilter entityFilter) const override;
   EntityPtr findEntityAtTile(Vec2I const& pos, EntityFilterOf<TileEntity> entityFilter) const override;
-  bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false) const override;
+  bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false, bool checkCollision = false) const override;
+  CollisionKind tileCollisionKind(Vec2I const& pos) const override;
   void forEachCollisionBlock(RectI const& region, function<void(CollisionBlock const&)> const& iterator) const override;
   bool isTileConnectable(Vec2I const& pos, TileLayer layer, bool tilesOnly = false) const override;
   bool pointTileCollision(Vec2F const& point, CollisionSet const& collisionSet = DefaultCollisionSet) const override;

source/game/interfaces/StarTileEntity.hpp

@@ -4,6 +4,7 @@
 #include "StarEntity.hpp"
 #include "StarTileDamage.hpp"
 #include "StarInteractiveEntity.hpp"
+#include "StarCollisionBlock.hpp"
 
 namespace Star {
 
@@ -17,6 +18,7 @@ struct MaterialSpace {
 
   Vec2I space;
   MaterialId material;
+  Maybe<CollisionKind> prevCollision;
 };
 
 DataStream& operator<<(DataStream& ds, MaterialSpace const& materialSpace);
@@ -89,7 +91,9 @@ inline MaterialSpace::MaterialSpace(Vec2I space, MaterialId material)
   : space(space), material(material) {}
 
 inline bool MaterialSpace::operator==(MaterialSpace const& rhs) const {
-  return tie(space, material) == tie(rhs.space, rhs.material);
+  return space         == rhs.space
+      && material      == rhs.material
+      && prevCollision == rhs.prevCollision;
 }
 
 }

source/game/interfaces/StarWorld.hpp

@@ -76,7 +76,10 @@ public:
   virtual EntityPtr findEntityAtTile(Vec2I const& pos, EntityFilterOf<TileEntity> entityFilter) const = 0;
 
   // Is the given tile layer and position occupied by an entity or block?
-  virtual bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false) const = 0;
+  virtual bool tileIsOccupied(Vec2I const& pos, TileLayer layer, bool includeEphemeral = false, bool checkCollision = false) const = 0;
+
+  // Returns the collision kind of a tile.
+  virtual CollisionKind tileCollisionKind(Vec2I const& pos) const = 0;
 
   // Iterate over the collision block for each tile in the region.  Collision
   // polys for tiles can extend to a maximum of 1 tile outside of the natural