From 89f7dc1efd6b0062b4b9e5c3509c301ccadb7a13 Mon Sep 17 00:00:00 2001
From: kwolekr <kwolekr@minetest.net>
Date: Sun, 9 Feb 2014 16:36:30 -0500
Subject: [PATCH] ServerEnvironment: Remove direct dependency on EmergeManager

---
 src/emerge.h        | 10 +---------
 src/environment.cpp |  9 ++-------
 src/environment.h   |  6 +-----
 src/map.cpp         | 16 ++++++++++++++--
 src/map.h           |  8 ++++++++
 src/server.cpp      |  2 +-
 6 files changed, 27 insertions(+), 24 deletions(-)

diff --git a/src/emerge.h b/src/emerge.h
index 14a2728ba..f3bafc8c8 100644
--- a/src/emerge.h
+++ b/src/emerge.h
@@ -70,15 +70,7 @@ struct BlockEmergeData {
 	u8 flags;
 };
 
-class IBackgroundBlockEmerger
-{
-public:
-	virtual bool enqueueBlockEmerge(u16 peer_id, v3s16 p,
-			bool allow_generate) = 0;
-	virtual ~IBackgroundBlockEmerger() {}
-};
-
-class EmergeManager : public IBackgroundBlockEmerger {
+class EmergeManager {
 public:
 	INodeDefManager *ndef;
 
diff --git a/src/environment.cpp b/src/environment.cpp
index aea3afeaa..08564046e 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -312,12 +312,10 @@ void ActiveBlockList::update(std::list<v3s16> &active_positions,
 */
 
 ServerEnvironment::ServerEnvironment(ServerMap *map,
-		GameScripting *scriptIface,
-		IGameDef *gamedef, IBackgroundBlockEmerger *emerger):
+		GameScripting *scriptIface, IGameDef *gamedef):
 	m_map(map),
 	m_script(scriptIface),
 	m_gamedef(gamedef),
-	m_emerger(emerger),
 	m_random_spawn_timer(3),
 	m_send_recommended_timer(0),
 	m_active_block_interval_overload_skip(0),
@@ -1148,11 +1146,8 @@ void ServerEnvironment::step(float dtime)
 		{
 			v3s16 p = *i;
 
-			MapBlock *block = m_map->getBlockNoCreateNoEx(p);
+			MapBlock *block = m_map->getBlockOrEmerge(p);
 			if(block==NULL){
-				// Block needs to be fetched first
-				m_emerger->enqueueBlockEmerge(
-						PEER_ID_INEXISTENT, p, false);
 				m_active_blocks.m_list.erase(p);
 				continue;
 			}
diff --git a/src/environment.h b/src/environment.h
index ffd4a1554..9e282476f 100644
--- a/src/environment.h
+++ b/src/environment.h
@@ -44,7 +44,6 @@ class ActiveBlockModifier;
 class ServerActiveObject;
 class ITextureSource;
 class IGameDef;
-class IBackgroundBlockEmerger;
 class Map;
 class ServerMap;
 class ClientMap;
@@ -194,8 +193,7 @@ class ServerEnvironment : public Environment
 {
 public:
 	ServerEnvironment(ServerMap *map, GameScripting *scriptIface,
-			IGameDef *gamedef,
-			IBackgroundBlockEmerger *emerger);
+			IGameDef *gamedef);
 	~ServerEnvironment();
 
 	Map & getMap();
@@ -367,8 +365,6 @@ private:
 	GameScripting* m_script;
 	// Game definition
 	IGameDef *m_gamedef;
-	// Background block emerger (the EmergeManager, in practice)
-	IBackgroundBlockEmerger *m_emerger;
 	// Active object list
 	std::map<u16, ServerActiveObject*> m_active_objects;
 	// Outgoing network message buffer for active objects
diff --git a/src/map.cpp b/src/map.cpp
index 075649f94..22ea41e04 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -3126,7 +3126,9 @@ MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
 
 		return block;
 	}
-	/*if(allow_generate)
+
+#if 0
+	if(allow_generate)
 	{
 		std::map<v3s16, MapBlock*> modified_blocks;
 		MapBlock *block = generateBlock(p, modified_blocks);
@@ -3149,11 +3151,21 @@ MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
 
 			return block;
 		}
-	}*/
+	}
+#endif
 
 	return NULL;
 }
 
+MapBlock *ServerMap::getBlockOrEmerge(v3s16 p3d)
+{
+	MapBlock *block = getBlockNoCreateNoEx(p3d);
+	if (block == NULL)
+		m_emerge->enqueueBlockEmerge(PEER_ID_INEXISTENT, p3d, false);
+
+	return block;
+}
+
 void ServerMap::prepareBlock(MapBlock *block) {
 	ServerEnvironment *senv = &((Server *)m_gamedef)->getEnv();
 
diff --git a/src/map.h b/src/map.h
index 54d8fe9ea..191cf5f94 100644
--- a/src/map.h
+++ b/src/map.h
@@ -424,6 +424,14 @@ public:
 	*/
 	MapBlock * emergeBlock(v3s16 p, bool create_blank=true);
 	
+	/*
+		Try to get a block.
+		If it does not exist in memory, add it to the emerge queue.
+		- Memory
+		- Emerge Queue (deferred disk or generate)
+	*/
+	MapBlock *getBlockOrEmerge(v3s16 p3d);
+
 	// Carries out any initialization necessary before block is sent
 	void prepareBlock(MapBlock *block);
 
diff --git a/src/server.cpp b/src/server.cpp
index 151bcada1..66f3cc1a7 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -343,7 +343,7 @@ Server::Server(
 
 	// Initialize Environment
 	ServerMap *servermap = new ServerMap(path_world, this, m_emerge);
-	m_env = new ServerEnvironment(servermap, m_script, this, m_emerge);
+	m_env = new ServerEnvironment(servermap, m_script, this);
 
 	m_clients.setEnv(m_env);