Merge Minetest commits

2016-02-11 22:35:23 +02:00 · 2016-02-11 22:35:23 +02:00 · ae66c6a782
parent 86bc1f4300 fefa148d69
commit ae66c6a782
61 changed files with 561 additions and 356 deletions
--- a/builtin/game/chatcommands.lua
+++ b/builtin/game/chatcommands.lua
@ -848,14 +848,25 @@ core.register_chatcommand("kick", {
 })

 core.register_chatcommand("clearobjects", {
+	params = "[full|quick]",
 	description = "clear all objects in world",
 	privs = {server=true},
 	func = function(name, param)
-		core.log("action", name .. " clears all objects.")
+		options = {}
+		if param == "" or param == "full" then
+			options.mode = "full"
+		elseif param == "quick" then
+			options.mode = "quick"
+		else
+			return false, "Invalid usage, see /help clearobjects."
+		end
+
+		core.log("action", name .. " clears all objects ("
+				.. options.mode .. " mode).")
 		core.chat_send_all("Clearing all objects.  This may take long."
 				.. "  You may experience a timeout.  (by "
 				.. name .. ")")
-		core.clear_objects()
+		core.clear_objects(options)
 		core.log("action", "Object clearing done.")
 		core.chat_send_all("*** Cleared all objects.")
 	end,
--- a/builtin/game/item.lua
+++ b/builtin/game/item.lua
@ -88,25 +88,26 @@ function core.dir_to_facedir(dir, is6d)
 	end
 end

+-- Table of possible dirs
+local facedir_to_dir = {
+	{x= 0, y=0,  z= 1},
+	{x= 1, y=0,  z= 0},
+	{x= 0, y=0,  z=-1},
+	{x=-1, y=0,  z= 0},
+	{x= 0, y=-1, z= 0},
+	{x= 0, y=1,  z= 0},
+}
+-- Mapping from facedir value to index in facedir_to_dir.
+local facedir_to_dir_map = {
+	[0]=1, 2, 3, 4,
+	5, 2, 6, 4,
+	6, 2, 5, 4,
+	1, 5, 3, 6,
+	1, 6, 3, 5,
+	1, 4, 3, 2,
+}
 function core.facedir_to_dir(facedir)
-	--a table of possible dirs
-	return ({{x=0, y=0, z=1},
-					{x=1, y=0, z=0},
-					{x=0, y=0, z=-1},
-					{x=-1, y=0, z=0},
-					{x=0, y=-1, z=0},
-					{x=0, y=1, z=0}})
-
-					--indexed into by a table of correlating facedirs
-					[({[0]=1, 2, 3, 4,
-						5, 2, 6, 4,
-						6, 2, 5, 4,
-						1, 5, 3, 6,
-						1, 6, 3, 5,
-						1, 4, 3, 2})
-
-						--indexed into by the facedir in question
-						[facedir]]
+	return facedir_to_dir[facedir_to_dir_map[facedir]]
 end

 function core.dir_to_wallmounted(dir)
@ -131,17 +132,17 @@ function core.dir_to_wallmounted(dir)
 	end
 end

+-- table of dirs in wallmounted order
+local wallmounted_to_dir = {
+	[0] = {x = 0, y = 1, z = 0},
+	{x =  0, y = -1, z =  0},
+	{x =  1, y =  0, z =  0},
+	{x = -1, y =  0, z =  0},
+	{x =  0, y =  0, z =  1},
+	{x =  0, y =  0, z = -1},
+}
 function core.wallmounted_to_dir(wallmounted)
-	-- table of dirs in wallmounted order
-	return ({[0] = {x = 0, y = 1, z = 0},
-		{x = 0,  y = -1, z = 0},
-		{x = 1,  y = 0,  z = 0},
-		{x = -1, y = 0,  z = 0},
-		{x = 0,  y = 0,  z = 1},
-		{x = 0,  y = 0,  z = -1}})
-
-		--indexed into by the wallmounted in question
-		[wallmounted]
+	return wallmounted_to_dir[wallmounted]
 end

 function core.get_node_drops(nodename, toolname)
--- a/builtin/settingtypes.txt
+++ b/builtin/settingtypes.txt
@ -326,6 +326,11 @@ fsaa (FSAA) enum 0 0,1,2,4,8,16
 #    Thy only work with the OpenGL video backend.
 enable_shaders (Shaders) bool true

+[****Tone Mapping]
+
+#    Enables filmic tone mapping
+tone_mapping (Filmic tone mapping) bool false
+
 [****Bumpmapping]

 #    Enables bumpmapping for textures. Normalmaps need to be supplied by the texture pack
@ -697,12 +702,6 @@ enable_pvp (Player versus Player) bool true
 #    If this is set, players will always (re)spawn at the given position.
 static_spawnpoint (Static spawnpoint) string

-#    Maximum distance above water level for player spawn.
-#    Larger values result in spawn points closer to (x = 0, z = 0).
-#    Smaller values may result in a suitable spawn point not being found,
-#    resulting in a spawn at (0, 0, 0) possibly buried underground.
-vertical_spawn_range (Vertical spawn range) int 16
-
 #    If enabled, new players cannot join with an empty password.
 disallow_empty_password (Disallow empty passwords) bool false

--- a/client/shaders/nodes_shader/opengl_fragment.glsl
+++ b/client/shaders/nodes_shader/opengl_fragment.glsl
@ -20,6 +20,38 @@ bool normalTexturePresent = false;
 const float e = 2.718281828459;
 const float BS = 10.0;

+#ifdef ENABLE_TONE_MAPPING
+
+/* Hable's UC2 Tone mapping parameters
+	A = 0.22;
+	B = 0.30;
+	C = 0.10;
+	D = 0.20;
+	E = 0.01;
+	F = 0.30;
+	W = 11.2;
+	equation used:  ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
+*/
+
+vec3 uncharted2Tonemap(vec3 x)
+{
+	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03334;
+}
+
+vec4 applyToneMapping(vec4 color)
+{
+	color = vec4(pow(color.rgb, vec3(2.2)), color.a);
+	const float gamma = 1.6;
+	const float exposureBias = 5.5;
+	color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
+	// Precalculated white_scale from 
+	//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
+	vec3 whiteScale = vec3(1.036015346);
+	color.rgb *= whiteScale;
+	return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
+}
+#endif
+
 void get_texture_flags()
 {
 	vec4 flags = texture2D(textureFlags, vec2(0.0, 0.0));
@ -160,22 +192,26 @@ void main(void)
 	color = base.rgb;
 #endif

+	vec4 col = vec4(color.rgb * gl_Color.rgb, 1.0); 
+	
 #if MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE
 	float alpha = gl_Color.a;
-	vec4 col = vec4(color.rgb, alpha);
-	col *= gl_Color;
 	if (fogDistance != 0.0) {
 		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
 		alpha = mix(alpha, 0.0, d);
 	}
-	gl_FragColor = vec4(col.rgb, alpha);
+	col = vec4(col.rgb, alpha);
 #else
-	vec4 col = vec4(color.rgb, base.a);
-	col *= gl_Color;
 	if (fogDistance != 0.0) {
 		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
 		col = mix(col, skyBgColor, d);
 	}
-	gl_FragColor = vec4(col.rgb, base.a);
+	col = vec4(col.rgb, base.a);
+#endif
+
+#ifdef ENABLE_TONE_MAPPING
+	gl_FragColor = applyToneMapping(col);
+#else
+	gl_FragColor = col;
 #endif
 }
--- a/client/shaders/water_surface_shader/opengl_fragment.glsl
+++ b/client/shaders/water_surface_shader/opengl_fragment.glsl
@ -22,6 +22,38 @@ bool texSeamless = false;
 const float e = 2.718281828459;
 const float BS = 10.0;

+#ifdef ENABLE_TONE_MAPPING
+
+/* Hable's UC2 Tone mapping parameters
+	A = 0.22;
+	B = 0.30;
+	C = 0.10;
+	D = 0.20;
+	E = 0.01;
+	F = 0.30;
+	W = 11.2;
+	equation used:  ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
+*/
+
+vec3 uncharted2Tonemap(vec3 x)
+{
+	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03334;
+}
+
+vec4 applyToneMapping(vec4 color)
+{
+	color = vec4(pow(color.rgb, vec3(2.2)), color.a);
+	const float gamma = 1.6;
+	const float exposureBias = 5.5;
+	color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
+	// Precalculated white_scale from 
+	//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
+	vec3 whiteScale = vec3(1.036015346);
+	color.rgb *= whiteScale;
+	return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
+}
+#endif
+
 void get_texture_flags()
 {
 	vec4 flags = texture2D(textureFlags, vec2(0.0, 0.0));
@ -116,22 +148,26 @@ vec4 base = texture2D(baseTexture, uv).rgba;
 	color = base.rgb;
 #endif

+	vec4 col = vec4(color.rgb * gl_Color.rgb, 1.0); 
+
 #if MATERIAL_TYPE == TILE_MATERIAL_LIQUID_TRANSPARENT || MATERIAL_TYPE == TILE_MATERIAL_LIQUID_OPAQUE
 	float alpha = gl_Color.a;
-	vec4 col = vec4(color.rgb, alpha);
-	col *= gl_Color;
-	if(fogDistance != 0.0){
+	if (fogDistance != 0.0) {
 		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
 		alpha = mix(alpha, 0.0, d);
 	}
-	gl_FragColor = vec4(col.rgb, alpha);
+	col = vec4(col.rgb, alpha);
 #else
-	vec4 col = vec4(color.rgb, base.a);
-	col *= gl_Color;
-	if(fogDistance != 0.0){
+	if (fogDistance != 0.0) {
 		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
 		col = mix(col, skyBgColor, d);
 	}
-	gl_FragColor = vec4(col.rgb, base.a);
+	col = vec4(col.rgb, base.a);
+#endif
+
+#ifdef ENABLE_TONE_MAPPING
+	gl_FragColor = applyToneMapping(col);
+#else
+	gl_FragColor = col;
 #endif
 }
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@ -2046,8 +2046,12 @@ and `minetest.auth_reload` call the authetification handler.
 * `minetest.generate_decorations(vm, pos1, pos2)`
    * Generate all registered decorations within the VoxelManip `vm` and in the area from `pos1` to `pos2`.
    * `pos1` and `pos2` are optional and default to mapchunk minp and maxp.
-* `minetest.clear_objects()`
-    * clear all objects in the environments
+* `minetest.clear_objects([options])`
+    * Clear all objects in the environment
+    * Takes an optional table as an argument with the field `mode`.
+        * mode = `"full"`: Load and go through every mapblock, clearing objects (default).
+        * mode = `"quick"`: Clear objects immediately in loaded mapblocks;
+          clear objects in unloaded mapblocks only when the mapblocks are next activated.
 * `minetest.emerge_area(pos1, pos2, [callback], [param])`
    * Queue all blocks in the area from `pos1` to `pos2`, inclusive, to be asynchronously
    * fetched from memory, loaded from disk, or if inexistent, generates them.
@ -2149,6 +2153,8 @@ and `minetest.auth_reload` call the authetification handler.
    * Convert a facedir back into a vector aimed directly out the "back" of a node
 * `minetest.dir_to_wallmounted(dir)`
    * Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"`
+* `minetest.wallmounted_to_dir(wallmounted)`
+    * Convert a wallmounted value back into a vector aimed directly out the "back" of a node
 * `minetest.get_node_drops(nodename, toolname)`
    * Returns list of item names.
    * **Note**: This will be removed or modified in a future version.
--- a/multicraft.conf.example
+++ b/multicraft.conf.example
@ -353,6 +353,12 @@
 #    type: bool
 # enable_shaders = true

+##### Tone mapping
+#    Enables filmic tone mapping.
+#    Requires shaders to be enabled.
+#    type: bool
+# tone_mapping = false
+
 ##### Bumpmapping

 #    Enables bumpmapping for textures. Normalmaps need to be supplied by the texture pack
@ -833,13 +839,6 @@
 #    type: string
 # static_spawnpoint = 

-#    Maximum distance above water level for player spawn.
-#    Larger values result in spawn points closer to (x = 0, z = 0).
-#    Smaller values may result in a suitable spawn point not being found,
-#    resulting in a spawn at (0, 0, 0) possibly buried underground.
-#    type: int
-# vertical_spawn_range = 16
-
 #    If enabled, new players cannot join with an empty password.
 #    type: bool
 # disallow_empty_password = false
--- a/src/client.cpp
+++ b/src/client.cpp
@ -1471,13 +1471,13 @@ ClientActiveObject * Client::getSelectedActiveObject(
 	{
 		ClientActiveObject *obj = objects[i].obj;

-		core::aabbox3d<f32> *selection_box = obj->getSelectionBox();
+		aabb3f *selection_box = obj->getSelectionBox();
 		if(selection_box == NULL)
 			continue;

 		v3f pos = obj->getPosition();

-		core::aabbox3d<f32> offsetted_box(
+		aabb3f offsetted_box(
 				selection_box->MinEdge + pos,
 				selection_box->MaxEdge + pos
 		);
--- a/src/client/tile.h
+++ b/src/client/tile.h
@ -21,7 +21,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define TILE_HEADER

 #include "irrlichttypes.h"
-#include "irr_v2d.h"
 #include "irr_v3d.h"
 #include <ITexture.h>
 #include <IrrlichtDevice.h>
--- a/src/clientmap.cpp
+++ b/src/clientmap.cpp
@ -50,7 +50,7 @@ ClientMap::ClientMap(
 	m_camera_direction(0,0,1),
 	m_camera_fov(M_PI)
 {
-	m_box = core::aabbox3d<f32>(-BS*1000000,-BS*1000000,-BS*1000000,
+	m_box = aabb3f(-BS*1000000,-BS*1000000,-BS*1000000,
 			BS*1000000,BS*1000000,BS*1000000);

 	/* TODO: Add a callback function so these can be updated when a setting
@ -157,12 +157,9 @@ void ClientMap::updateDrawList(video::IVideoDriver* driver)
 	}
 	m_drawlist.clear();

-	m_camera_mutex.lock();
 	v3f camera_position = m_camera_position;
 	v3f camera_direction = m_camera_direction;
 	f32 camera_fov = m_camera_fov;
-	//v3s16 camera_offset = m_camera_offset;
-	m_camera_mutex.unlock();

 	// Use a higher fov to accomodate faster camera movements.
 	// Blocks are cropped better when they are drawn.
@ -433,11 +430,9 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 	int crack = m_client->getCrackLevel();
 	u32 daynight_ratio = m_client->getEnv().getDayNightRatio();

-	m_camera_mutex.lock();
 	v3f camera_position = m_camera_position;
 	v3f camera_direction = m_camera_direction;
 	f32 camera_fov = m_camera_fov;
-	m_camera_mutex.unlock();

 	/*
 		Get all blocks and draw all visible ones
@ -799,11 +794,7 @@ void ClientMap::renderPostFx(CameraMode cam_mode)
 	// Sadly ISceneManager has no "post effects" render pass, in that case we
 	// could just register for that and handle it in renderMap().

-	m_camera_mutex.lock();
-	v3f camera_position = m_camera_position;
-	m_camera_mutex.unlock();
-
-	MapNode n = getNodeNoEx(floatToInt(camera_position, BS));
+	MapNode n = getNodeNoEx(floatToInt(m_camera_position, BS));

 	// - If the player is in a solid node, make everything black.
 	// - If the player is in liquid, draw a semi-transparent overlay.
--- a/src/clientmap.h
+++ b/src/clientmap.h
@ -89,7 +89,6 @@ public:

 	void updateCamera(v3f pos, v3f dir, f32 fov, v3s16 offset)
 	{
-		MutexAutoLock lock(m_camera_mutex);
 		m_camera_position = pos;
 		m_camera_direction = dir;
 		m_camera_fov = fov;
@ -116,7 +115,7 @@ public:
 		renderMap(driver, SceneManager->getSceneNodeRenderPass());
 	}
 	
-	virtual const core::aabbox3d<f32>& getBoundingBox() const
+	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
 	}
@ -141,7 +140,7 @@ public:
 private:
 	Client *m_client;
 	
-	core::aabbox3d<f32> m_box;
+	aabb3f m_box;
 	
 	MapDrawControl &m_control;

@ -149,7 +148,6 @@ private:
 	v3f m_camera_direction;
 	f32 m_camera_fov;
 	v3s16 m_camera_offset;
-	Mutex m_camera_mutex;

 	std::map<v3s16, MapBlock*> m_drawlist;
 	
--- a/src/clientobject.h
+++ b/src/clientobject.h
@ -56,7 +56,7 @@ public:
 	virtual void updateLight(u8 light_at_pos){}
 	virtual void updateLightNoCheck(u8 light_at_pos){}
 	virtual v3s16 getLightPosition(){return v3s16(0,0,0);}
-	virtual core::aabbox3d<f32>* getSelectionBox(){return NULL;}
+	virtual aabb3f *getSelectionBox() { return NULL; }
 	virtual bool getCollisionBox(aabb3f *toset){return false;}
 	virtual bool collideWithObjects(){return false;}
 	virtual v3f getPosition(){return v3f(0,0,0);}
--- a/src/clouds.cpp
+++ b/src/clouds.cpp
@ -62,7 +62,7 @@ Clouds::Clouds(
 	g_settings->registerChangedCallback("enable_3d_clouds",
 		&cloud_3d_setting_changed, this);

-	m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
+	m_box = aabb3f(-BS*1000000,m_cloud_y-BS,-BS*1000000,
 			BS*1000000,m_cloud_y+BS,BS*1000000);

 }
--- a/src/clouds.h
+++ b/src/clouds.h
@ -53,7 +53,7 @@ public:

 	virtual void render();
 	
-	virtual const core::aabbox3d<f32>& getBoundingBox() const
+	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
 	}
@ -79,7 +79,7 @@ public:
 	void updateCameraOffset(v3s16 camera_offset)
 	{
 		m_camera_offset = camera_offset;
-		m_box = core::aabbox3d<f32>(-BS * 1000000, m_cloud_y - BS - BS * camera_offset.Y, -BS * 1000000,
+		m_box = aabb3f(-BS * 1000000, m_cloud_y - BS - BS * camera_offset.Y, -BS * 1000000,
 			BS * 1000000, m_cloud_y + BS - BS * camera_offset.Y, BS * 1000000);
 	}

@ -87,7 +87,7 @@ public:

 private:
 	video::SMaterial m_material;
-	core::aabbox3d<f32> m_box;
+	aabb3f m_box;
 	s16 m_passed_cloud_y;
 	float m_cloud_y;
 	u16 m_cloud_radius_i;
--- a/src/content_cao.cpp
+++ b/src/content_cao.cpp
@ -309,7 +309,7 @@ public:

 	void initialize(const std::string &data);

-	core::aabbox3d<f32>* getSelectionBox()
+	aabb3f *getSelectionBox()
 		{return &m_selection_box;}
 	v3f getPosition()
 		{return m_position;}
@ -319,7 +319,7 @@ public:

 	bool getCollisionBox(aabb3f *toset) { return false; }
 private:
-	core::aabbox3d<f32> m_selection_box;
+	aabb3f m_selection_box;
 	scene::IMeshSceneNode *m_node;
 	v3f m_position;
 	std::string m_itemstring;
@ -674,7 +674,7 @@ GenericCAO::~GenericCAO()
 	removeFromScene(true);
 }

-core::aabbox3d<f32>* GenericCAO::getSelectionBox()
+aabb3f *GenericCAO::getSelectionBox()
 {
 	if(!m_prop.is_visible || !m_is_visible || m_is_local_player || getParent() != NULL)
 		return NULL;
@ -1185,7 +1185,7 @@ void GenericCAO::step(float dtime, ClientEnvironment *env)

 		if(m_prop.physical)
 		{
-			core::aabbox3d<f32> box = m_prop.collisionbox;
+			aabb3f box = m_prop.collisionbox;
 			box.MinEdge *= BS;
 			box.MaxEdge *= BS;
 			collisionMoveResult moveresult;
--- a/src/content_cao.h
+++ b/src/content_cao.h
@ -65,7 +65,7 @@ private:
 	//
 	scene::ISceneManager *m_smgr;
 	IrrlichtDevice *m_irr;
-	core::aabbox3d<f32> m_selection_box;
+	aabb3f m_selection_box;
 	scene::IMeshSceneNode *m_meshnode;
 	scene::IAnimatedMeshSceneNode *m_animated_meshnode;
 	WieldMeshSceneNode *m_wield_meshnode;
@ -127,7 +127,7 @@ public:

 	bool collideWithObjects();

-	core::aabbox3d<f32>* getSelectionBox();
+	aabb3f *getSelectionBox();

 	v3f getPosition();

--- a/src/content_sao.cpp
+++ b/src/content_sao.cpp
@ -259,7 +259,7 @@ void LuaEntitySAO::step(float dtime, bool send_recommended)
 	else
 	{
 		if(m_prop.physical){
-			core::aabbox3d<f32> box = m_prop.collisionbox;
+			aabb3f box = m_prop.collisionbox;
 			box.MinEdge *= BS;
 			box.MaxEdge *= BS;
 			collisionMoveResult moveresult;
@ -786,7 +786,7 @@ PlayerSAO::PlayerSAO(ServerEnvironment *env_, Player *player_, u16 peer_id_,
 	m_prop.hp_max = PLAYER_MAX_HP;
 	m_prop.physical = false;
 	m_prop.weight = 75;
-	m_prop.collisionbox = core::aabbox3d<f32>(-1/3.,-1.0,-1/3., 1/3.,1.0,1/3.);
+	m_prop.collisionbox = aabb3f(-1/3.,-1.0,-1/3., 1/3.,1.0,1/3.);
 	// start of default appearance, this should be overwritten by LUA
 	m_prop.visual = "upright_sprite";
 	m_prop.visual_size = v2f(1, 2);
--- a/src/defaultsettings.cpp
+++ b/src/defaultsettings.cpp
@ -159,6 +159,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("texture_clean_transparent", "false");
 	settings->setDefault("texture_min_size", "32");
 	settings->setDefault("preload_item_visuals", "false");
+	settings->setDefault("tone_mapping", "false");
 	settings->setDefault("enable_bumpmapping", "false");
 	settings->setDefault("enable_parallax_occlusion", "false");
 	settings->setDefault("generate_normalmaps", "false");
@ -246,7 +247,6 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("default_privs", "interact, shout");
 	settings->setDefault("player_transfer_distance", "0");
 	settings->setDefault("enable_pvp", "true");
-	settings->setDefault("vertical_spawn_range", "128");
 	settings->setDefault("disallow_empty_password", "false");
 	settings->setDefault("disable_anticheat", "false");
 	settings->setDefault("enable_rollback_recording", "false");
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@ -334,6 +334,18 @@ v3s16 EmergeManager::getContainingChunk(v3s16 blockpos, s16 chunksize)
 }


+int EmergeManager::getSpawnLevelAtPoint(v2s16 p)
+{
+	if (m_mapgens.size() == 0 || !m_mapgens[0]) {
+		errorstream << "EmergeManager: getSpawnLevelAtPoint() called"
+			" before mapgen init" << std::endl;
+		return 0;
+	}
+
+	return m_mapgens[0]->getSpawnLevelAtPoint(p);
+}
+
+
 int EmergeManager::getGroundLevelAtPoint(v2s16 p)
 {
 	if (m_mapgens.size() == 0 || !m_mapgens[0]) {
--- a/src/emerge.h
+++ b/src/emerge.h
@ -136,6 +136,7 @@ public:

 	// Mapgen helpers methods
 	Biome *getBiomeAtPoint(v3s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 	int getGroundLevelAtPoint(v2s16 p);
 	bool isBlockUnderground(v3s16 blockpos);

--- a/src/environment.cpp
+++ b/src/environment.cpp
@ -354,6 +354,7 @@ ServerEnvironment::ServerEnvironment(ServerMap *map,
 	m_active_block_interval_overload_skip(0),
 	m_game_time(0),
 	m_game_time_fraction_counter(0),
+	m_last_clear_objects_time(0),
 	m_recommended_send_interval(0.1),
 	m_max_lag_estimate(0.1)
 {
@ -503,6 +504,7 @@ void ServerEnvironment::saveMeta()
 	Settings args;
 	args.setU64("game_time", m_game_time);
 	args.setU64("time_of_day", getTimeOfDay());
+	args.setU64("last_clear_objects_time", m_last_clear_objects_time);
 	args.writeLines(ss);
 	ss<<"EnvArgsEnd\n";

@ -546,6 +548,13 @@ void ServerEnvironment::loadMeta()
 		// This is not as important
 		setTimeOfDay(9000);
 	}
+
+	try {
+		m_last_clear_objects_time = args.getU64("last_clear_objects_time");
+	} catch (SettingNotFoundException &e) {
+		// If missing, do as if clearObjects was never called
+		m_last_clear_objects_time = 0;
+	}
 }

 struct ActiveABM
@ -739,13 +748,19 @@ void ServerEnvironment::activateBlock(MapBlock *block, u32 additional_dtime)
 	// Get time difference
 	u32 dtime_s = 0;
 	u32 stamp = block->getTimestamp();
-	if(m_game_time > stamp && stamp != BLOCK_TIMESTAMP_UNDEFINED)
-		dtime_s = m_game_time - block->getTimestamp();
+	if (m_game_time > stamp && stamp != BLOCK_TIMESTAMP_UNDEFINED)
+		dtime_s = m_game_time - stamp;
 	dtime_s += additional_dtime;

 	/*infostream<<"ServerEnvironment::activateBlock(): block timestamp: "
 			<<stamp<<", game time: "<<m_game_time<<std::endl;*/

+	// Remove stored static objects if clearObjects was called since block's timestamp
+	if (stamp == BLOCK_TIMESTAMP_UNDEFINED || stamp < m_last_clear_objects_time) {
+		block->m_static_objects.m_stored.clear();
+		// do not set changed flag to avoid unnecessary mapblock writes
+	}
+
 	// Set current time as timestamp
 	block->setTimestampNoChangedFlag(m_game_time);

@ -858,22 +873,22 @@ void ServerEnvironment::getObjectsInsideRadius(std::vector<u16> &objects, v3f po
 	}
 }

-void ServerEnvironment::clearAllObjects()
+void ServerEnvironment::clearObjects(ClearObjectsMode mode)
 {
-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Removing all active objects"<<std::endl;
+	infostream << "ServerEnvironment::clearObjects(): "
+		<< "Removing all active objects" << std::endl;
 	std::vector<u16> objects_to_remove;
-	for(std::map<u16, ServerActiveObject*>::iterator
+	for (std::map<u16, ServerActiveObject*>::iterator
 			i = m_active_objects.begin();
 			i != m_active_objects.end(); ++i) {
 		ServerActiveObject* obj = i->second;
-		if(obj->getType() == ACTIVEOBJECT_TYPE_PLAYER)
+		if (obj->getType() == ACTIVEOBJECT_TYPE_PLAYER)
 			continue;
 		u16 id = i->first;
 		// Delete static object if block is loaded
-		if(obj->m_static_exists){
+		if (obj->m_static_exists) {
 			MapBlock *block = m_map->getBlockNoCreateNoEx(obj->m_static_block);
-			if(block){
+			if (block) {
 				block->m_static_objects.remove(id);
 				block->raiseModified(MOD_STATE_WRITE_NEEDED,
 						MOD_REASON_CLEAR_ALL_OBJECTS);
@ -881,7 +896,7 @@ void ServerEnvironment::clearAllObjects()
 			}
 		}
 		// If known by some client, don't delete immediately
-		if(obj->m_known_by_count > 0){
+		if (obj->m_known_by_count > 0) {
 			obj->m_pending_deactivation = true;
 			obj->m_removed = true;
 			continue;
@ -893,39 +908,46 @@ void ServerEnvironment::clearAllObjects()
 		m_script->removeObjectReference(obj);

 		// Delete active object
-		if(obj->environmentDeletes())
+		if (obj->environmentDeletes())
 			delete obj;
 		// Id to be removed from m_active_objects
 		objects_to_remove.push_back(id);
 	}

 	// Remove references from m_active_objects
-	for(std::vector<u16>::iterator i = objects_to_remove.begin();
+	for (std::vector<u16>::iterator i = objects_to_remove.begin();
 			i != objects_to_remove.end(); ++i) {
 		m_active_objects.erase(*i);
 	}

 	// Get list of loaded blocks
 	std::vector<v3s16> loaded_blocks;
-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Listing all loaded blocks"<<std::endl;
+	infostream << "ServerEnvironment::clearObjects(): "
+		<< "Listing all loaded blocks" << std::endl;
 	m_map->listAllLoadedBlocks(loaded_blocks);
-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Done listing all loaded blocks: "
-			<<loaded_blocks.size()<<std::endl;
+	infostream << "ServerEnvironment::clearObjects(): "
+		<< "Done listing all loaded blocks: "
+		<< loaded_blocks.size()<<std::endl;

 	// Get list of loadable blocks
 	std::vector<v3s16> loadable_blocks;
-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Listing all loadable blocks"<<std::endl;
-	m_map->listAllLoadableBlocks(loadable_blocks);
-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Done listing all loadable blocks: "
-			<<loadable_blocks.size()
-			<<", now clearing"<<std::endl;
+	if (mode == CLEAR_OBJECTS_MODE_FULL) {
+		infostream << "ServerEnvironment::clearObjects(): "
+			<< "Listing all loadable blocks" << std::endl;
+		m_map->listAllLoadableBlocks(loadable_blocks);
+		infostream << "ServerEnvironment::clearObjects(): "
+			<< "Done listing all loadable blocks: "
+			<< loadable_blocks.size() << std::endl;
+	} else {
+		loadable_blocks = loaded_blocks;
+	}
+
+	infostream << "ServerEnvironment::clearObjects(): "
+		<< "Now clearing objects in " << loadable_blocks.size()
+		<< " blocks" << std::endl;

 	// Grab a reference on each loaded block to avoid unloading it
-	for(std::vector<v3s16>::iterator i = loaded_blocks.begin();
+	for (std::vector<v3s16>::iterator i = loaded_blocks.begin();
 			i != loaded_blocks.end(); ++i) {
 		v3s16 p = *i;
 		MapBlock *block = m_map->getBlockNoCreateNoEx(p);
@ -934,24 +956,27 @@ void ServerEnvironment::clearAllObjects()
 	}

 	// Remove objects in all loadable blocks
-	u32 unload_interval = g_settings->getS32("max_clearobjects_extra_loaded_blocks");
-	unload_interval = MYMAX(unload_interval, 1);
+	u32 unload_interval = U32_MAX;
+	if (mode == CLEAR_OBJECTS_MODE_FULL) {
+		unload_interval = g_settings->getS32("max_clearobjects_extra_loaded_blocks");
+		unload_interval = MYMAX(unload_interval, 1);
+	}
 	u32 report_interval = loadable_blocks.size() / 10;
 	u32 num_blocks_checked = 0;
 	u32 num_blocks_cleared = 0;
 	u32 num_objs_cleared = 0;
-	for(std::vector<v3s16>::iterator i = loadable_blocks.begin();
+	for (std::vector<v3s16>::iterator i = loadable_blocks.begin();
 			i != loadable_blocks.end(); ++i) {
 		v3s16 p = *i;
 		MapBlock *block = m_map->emergeBlock(p, false);
-		if(!block){
-			errorstream<<"ServerEnvironment::clearAllObjects(): "
-					<<"Failed to emerge block "<<PP(p)<<std::endl;
+		if (!block) {
+			errorstream << "ServerEnvironment::clearObjects(): "
+				<< "Failed to emerge block " << PP(p) << std::endl;
 			continue;
 		}
 		u32 num_stored = block->m_static_objects.m_stored.size();
 		u32 num_active = block->m_static_objects.m_active.size();
-		if(num_stored != 0 || num_active != 0){
+		if (num_stored != 0 || num_active != 0) {
 			block->m_static_objects.m_stored.clear();
 			block->m_static_objects.m_active.clear();
 			block->raiseModified(MOD_STATE_WRITE_NEEDED,
@ -961,23 +986,23 @@ void ServerEnvironment::clearAllObjects()
 		}
 		num_blocks_checked++;

-		if(report_interval != 0 &&
-				num_blocks_checked % report_interval == 0){
+		if (report_interval != 0 &&
+				num_blocks_checked % report_interval == 0) {
 			float percent = 100.0 * (float)num_blocks_checked /
-					loadable_blocks.size();
-			infostream<<"ServerEnvironment::clearAllObjects(): "
-					<<"Cleared "<<num_objs_cleared<<" objects"
-					<<" in "<<num_blocks_cleared<<" blocks ("
-					<<percent<<"%)"<<std::endl;
+				loadable_blocks.size();
+			infostream << "ServerEnvironment::clearObjects(): "
+				<< "Cleared " << num_objs_cleared << " objects"
+				<< " in " << num_blocks_cleared << " blocks ("
+				<< percent << "%)" << std::endl;
 		}
-		if(num_blocks_checked % unload_interval == 0){
+		if (num_blocks_checked % unload_interval == 0) {
 			m_map->unloadUnreferencedBlocks();
 		}
 	}
 	m_map->unloadUnreferencedBlocks();

 	// Drop references that were added above
-	for(std::vector<v3s16>::iterator i = loaded_blocks.begin();
+	for (std::vector<v3s16>::iterator i = loaded_blocks.begin();
 			i != loaded_blocks.end(); ++i) {
 		v3s16 p = *i;
 		MapBlock *block = m_map->getBlockNoCreateNoEx(p);
@ -985,9 +1010,11 @@ void ServerEnvironment::clearAllObjects()
 		block->refDrop();
 	}

-	infostream<<"ServerEnvironment::clearAllObjects(): "
-			<<"Finished: Cleared "<<num_objs_cleared<<" objects"
-			<<" in "<<num_blocks_cleared<<" blocks"<<std::endl;
+	m_last_clear_objects_time = m_game_time;
+
+	infostream << "ServerEnvironment::clearObjects(): "
+		<< "Finished: Cleared " << num_objs_cleared << " objects"
+		<< " in " << num_blocks_cleared << " blocks" << std::endl;
 }

 void ServerEnvironment::step(float dtime)
--- a/src/environment.h
+++ b/src/environment.h
@ -203,6 +203,18 @@ public:
 private:
 };

+/*
+	Operation mode for ServerEnvironment::clearObjects()
+*/
+enum ClearObjectsMode {
+	// Load and go through every mapblock, clearing objects
+	CLEAR_OBJECTS_MODE_FULL,
+
+	// Clear objects immediately in loaded mapblocks;
+	// clear objects in unloaded mapblocks only when the mapblocks are next activated.
+	CLEAR_OBJECTS_MODE_QUICK,
+};
+
 /*
 	The server-side environment.

@ -319,8 +331,8 @@ public:
 	// Find all active objects inside a radius around a point
 	void getObjectsInsideRadius(std::vector<u16> &objects, v3f pos, float radius);

-	// Clear all objects, loading and going through every MapBlock
-	void clearAllObjects();
+	// Clear objects, loading and going through every MapBlock
+	void clearObjects(ClearObjectsMode mode);

 	// This makes stuff happen
 	void step(f32 dtime);
@ -410,6 +422,10 @@ private:
 	u32 m_game_time;
 	// A helper variable for incrementing the latter
 	float m_game_time_fraction_counter;
+	// Time of last clearObjects call (game time).
+	// When a mapblock older than this is loaded, its objects are cleared.
+	u32 m_last_clear_objects_time;
+	// Active block modifiers
 	std::vector<ABMWithState> m_abms;
 	// An interval for generally sending object positions and stuff
 	float m_recommended_send_interval;
--- a/src/guiFormSpecMenu.cpp
+++ b/src/guiFormSpecMenu.cpp
@ -1497,7 +1497,7 @@ void GUIFormSpecMenu::parseItemImageButton(parserData* data,std::string element)
 			258 + m_fields.size()
 		);

-		gui::IGUIButton *e = Environment->addButton(rect, this, spec.fid, spec.flabel.c_str());
+		gui::IGUIButton *e = Environment->addButton(rect, this, spec.fid, L"");

 		if (spec.fname == data->focused_fieldname) {
 			Environment->setFocus(e);
@ -1515,6 +1515,12 @@ void GUIFormSpecMenu::parseItemImageButton(parserData* data,std::string element)
 		pos.X += stof(v_pos[0]) * (float) spacing.X;
 		pos.Y += stof(v_pos[1]) * (float) spacing.Y;
 		m_itemimages.push_back(ImageDrawSpec("", item_name, pos, geom));
+
+		StaticTextSpec label_spec(
+			utf8_to_wide(label),
+			rect
+		);
+		m_static_texts.push_back(label_spec);
 		return;
 	}
 	errorstream<< "Invalid ItemImagebutton element(" << parts.size() << "): '" << element << "'"  << std::endl;
@ -1883,6 +1889,7 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 	m_boxes.clear();
 	m_tooltips.clear();
 	m_inventory_rings.clear();
+	m_static_texts.clear();

 	// Set default values (fits old formspec values)
 	m_bgcolor = video::SColor(140,0,0,0);
@ -2462,6 +2469,15 @@ void GUIFormSpecMenu::drawMenu()
 	m_pointer = m_device->getCursorControl()->getPosition();
 #endif

+	/*
+		Draw static text elements
+	*/
+	for (u32 i = 0; i < m_static_texts.size(); i++) {
+		const StaticTextSpec &spec = m_static_texts[i];	
+		video::SColor color(255, 255, 255, 255);
+		m_font->draw(spec.text.c_str(), spec.rect, color, true, true, &spec.rect);
+	}
+
 	/*
 		Draw fields/buttons tooltips
 	*/
--- a/src/guiFormSpecMenu.h
+++ b/src/guiFormSpecMenu.h
@ -228,6 +228,20 @@ class GUIFormSpecMenu : public GUIModalMenu
 		irr::video::SColor color;
 	};

+	struct StaticTextSpec {
+		StaticTextSpec()
+		{
+		}
+		StaticTextSpec(const std::wstring &a_text,
+				const core::rect<s32> &a_rect):
+			text(a_text),
+			rect(a_rect)
+		{
+		}
+		std::wstring text;
+		core::rect<s32> rect;
+	};
+
 public:
 	GUIFormSpecMenu(irr::IrrlichtDevice* dev,
 			gui::IGUIElement* parent, s32 id,
@ -339,6 +353,7 @@ protected:
 	std::vector<ImageDrawSpec> m_itemimages;
 	std::vector<BoxDrawSpec> m_boxes;
 	std::vector<FieldSpec> m_fields;
+	std::vector<StaticTextSpec> m_static_texts;
 	std::vector<std::pair<FieldSpec,GUITable*> > m_tables;
 	std::vector<std::pair<FieldSpec,gui::IGUICheckBox*> > m_checkboxes;
 	std::map<std::string, TooltipSpec> m_tooltips;
--- a/src/hud.cpp
+++ b/src/hud.cpp
@ -84,6 +84,8 @@ Hud::Hud(video::IVideoDriver *driver, scene::ISceneManager* smgr,

 	m_selection_mesh = NULL;
 	m_selection_boxes.clear();
+	m_halo_boxes.clear();
+
 	m_selection_pos = v3f(0.0, 0.0, 0.0);
 	std::string mode = g_settings->get("node_highlighting");
 	m_selection_material.Lighting = false;
@ -574,10 +576,23 @@ void Hud::updateSelectionMesh(const v3s16 &camera_offset)
 		0,0,1,1
 	};

-	m_selection_mesh = convertNodeboxesToMesh(m_selection_boxes, texture_uv);
+	// Use single halo box instead of multiple overlapping boxes.
+	// Temporary solution - problem can be solved with multiple
+	// rendering targets, or some method to remove inner surfaces.
+	// Thats because of halo transparency.

-	// scale final halo mesh
-	scaleMesh(m_selection_mesh, v3f(1.08, 1.08, 1.08));
+	aabb3f halo_box(100.0, 100.0, 100.0, -100.0, -100.0, -100.0);
+	m_halo_boxes.clear();
+
+	for (std::vector<aabb3f>::iterator
+			i = m_selection_boxes.begin();
+			i != m_selection_boxes.end(); ++i) {
+		halo_box.addInternalBox(*i);
+	}
+
+	m_halo_boxes.push_back(halo_box);
+	m_selection_mesh = convertNodeboxesToMesh(
+		m_halo_boxes, texture_uv, 0.5);
 }

 void Hud::resizeHotbar() {
--- a/src/hud.h
+++ b/src/hud.h
@ -162,6 +162,7 @@ private:
 	video::SColor hbar_colors[4];

 	std::vector<aabb3f> m_selection_boxes;
+	std::vector<aabb3f> m_halo_boxes;
 	v3f m_selection_pos;
 	v3f m_selection_pos_with_offset;

--- a/src/luaentity_common.h
+++ b/src/luaentity_common.h
@ -1,30 +0,0 @@
-/*
-Minetest
-Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 3.0 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public License along
-with this program; if not, write to the Free Software Foundation, Inc.,
-51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#ifndef LUAENTITY_COMMON_HEADER
-#define LUAENTITY_COMMON_HEADER
-
-#define LUAENTITY_CMD_UPDATE_POSITION 0
-#define LUAENTITY_CMD_SET_TEXTURE_MOD 1
-#define LUAENTITY_CMD_SET_SPRITE 2
-#define LUAENTITY_CMD_PUNCHED 3
-#define LUAENTITY_CMD_UPDATE_ARMOR_GROUPS 4
-
-#endif
-
--- a/src/mapgen.h
+++ b/src/mapgen.h
@ -181,6 +181,13 @@ public:
 	virtual void makeChunk(BlockMakeData *data) {}
 	virtual int getGroundLevelAtPoint(v2s16 p) { return 0; }

+	// getSpawnLevelAtPoint() is a function within each mapgen that returns a
+	// suitable y co-ordinate for player spawn ('suitable' usually meaning
+	// within 16 nodes of water_level). If a suitable spawn level cannot be
+	// found at the specified (X, Z) 'MAX_MAP_GENERATION_LIMIT' is returned to
+	// signify this and to cause Server::findSpawnPos() to try another (X, Z).
+	virtual int getSpawnLevelAtPoint(v2s16 p) { return 0; }
+
 private:
 	DISABLE_CLASS_COPY(Mapgen);
 };
--- a/src/mapgen_flat.cpp
+++ b/src/mapgen_flat.cpp
@ -192,18 +192,25 @@ void MapgenFlatParams::writeParams(Settings *settings) const
 /////////////////////////////////////////////////////////////////


-int MapgenFlat::getGroundLevelAtPoint(v2s16 p)
+int MapgenFlat::getSpawnLevelAtPoint(v2s16 p)
 {
+	s16 level_at_point = ground_level;
 	float n_terrain = NoisePerlin2D(&noise_terrain->np, p.X, p.Y, seed);
+
 	if ((spflags & MGFLAT_LAKES) && n_terrain < lake_threshold) {
-		s16 depress = (lake_threshold - n_terrain) * lake_steepness;
-		return ground_level - depress;
+		level_at_point = ground_level -
+			(lake_threshold - n_terrain) * lake_steepness;
 	} else if ((spflags & MGFLAT_HILLS) && n_terrain > hill_threshold) {
-		s16 rise = (n_terrain - hill_threshold) * hill_steepness;
-		return ground_level + rise;
-	} else {
-		return ground_level;
+		level_at_point = ground_level +
+			(n_terrain - hill_threshold) * hill_steepness;
 	}
+
+	if (ground_level < water_level)  // Ocean world, allow spawn in water
+		return MYMAX(level_at_point, water_level);
+	else if (level_at_point > water_level)
+		return level_at_point;  // Spawn on land
+	else
+		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 }


--- a/src/mapgen_flat.h
+++ b/src/mapgen_flat.h
@ -102,7 +102,7 @@ public:
 	~MapgenFlat();

 	virtual void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 	void calculateNoise();
 	s16 generateTerrain();
 	MgStoneType generateBiomes(float *heat_map, float *humidity_map);
--- a/src/mapgen_fractal.cpp
+++ b/src/mapgen_fractal.cpp
@ -209,17 +209,28 @@ void MapgenFractalParams::writeParams(Settings *settings) const
 /////////////////////////////////////////////////////////////////


-int MapgenFractal::getGroundLevelAtPoint(v2s16 p)
+int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
 {
-	s16 search_start = 128;
-	s16 search_end = -128;
-
-	for (s16 y = search_start; y >= search_end; y--) {
-		if (getFractalAtPoint(p.X, y, p.Y))
-			return y;
+	bool solid_below = false;  // Dry solid node is present below to spawn on
+	u8 air_count = 0;  // Consecutive air nodes above the dry solid node
+	s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
+	// Seabed can rise above water_level or might be raised to create dry land
+	s16 search_start = MYMAX(seabed_level, water_level + 1);
+	if (seabed_level > water_level)
+		solid_below = true;
+		
+	for (s16 y = search_start; y <= search_start + 128; y++) {
+		if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
+			solid_below = true;
+			air_count = 0;
+		} else if (solid_below) {  // Air above solid node
+			air_count++;
+			if (air_count == 2)
+				return y - 2;
+		}
 	}

-	return -MAX_MAP_GENERATION_LIMIT;
+	return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 }


--- a/src/mapgen_fractal.h
+++ b/src/mapgen_fractal.h
@ -114,7 +114,7 @@ public:
 	~MapgenFractal();

 	virtual void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 	void calculateNoise();
 	bool getFractalAtPoint(s16 x, s16 y, s16 z);
 	s16 generateTerrain();
--- a/src/mapgen_singlenode.cpp
+++ b/src/mapgen_singlenode.cpp
@ -99,7 +99,7 @@ void MapgenSinglenode::makeChunk(BlockMakeData *data)
 }


-int MapgenSinglenode::getGroundLevelAtPoint(v2s16 p)
+int MapgenSinglenode::getSpawnLevelAtPoint(v2s16 p)
 {
 	return 0;
 }
--- a/src/mapgen_singlenode.h
+++ b/src/mapgen_singlenode.h
@ -41,7 +41,7 @@ public:
 	~MapgenSinglenode();
 	
 	void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 };

 struct MapgenFactorySinglenode : public MapgenFactory {
--- a/src/mapgen_v5.cpp
+++ b/src/mapgen_v5.cpp
@ -171,7 +171,7 @@ void MapgenV5Params::writeParams(Settings *settings) const
 }


-int MapgenV5::getGroundLevelAtPoint(v2s16 p)
+int MapgenV5::getSpawnLevelAtPoint(v2s16 p)
 {
 	//TimeTaker t("getGroundLevelAtPoint", NULL, PRECISION_MICRO);

@ -182,24 +182,25 @@ int MapgenV5::getGroundLevelAtPoint(v2s16 p)
 		f *= 1.6;
 	float h = NoisePerlin2D(&noise_height->np, p.X, p.Y, seed);

-	s16 search_start = 128; // Only bother searching this range, actual
-	s16 search_end = -128;  // ground level is rarely higher or lower.
-
-	for (s16 y = search_start; y >= search_end; y--) {
+	for (s16 y = 128; y >= -128; y--) {
 		float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);
-		// If solid
-		if (n_ground * f > y - h) {
+
+		if (n_ground * f > y - h) {  // If solid
 			// If either top 2 nodes of search are solid this is inside a
-			// mountain or floatland with no space for the player to spawn.
-			if (y >= search_start - 1)
-				return MAX_MAP_GENERATION_LIMIT;
-			else
-				return y; // Ground below at least 2 nodes of space
+			// mountain or floatland with possibly no space for the player to spawn.
+			if (y >= 127) {
+				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+			} else {  // Ground below at least 2 nodes of empty space
+				if (y <= water_level || y > water_level + 16)
+					return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+				else
+					return y;
+			}
 		}
 	}

 	//printf("getGroundLevelAtPoint: %dus\n", t.stop());
-	return -MAX_MAP_GENERATION_LIMIT;
+	return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn position, no ground found
 }


--- a/src/mapgen_v5.h
+++ b/src/mapgen_v5.h
@ -90,7 +90,7 @@ public:
 	~MapgenV5();

 	virtual void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 	void calculateNoise();
 	int generateBaseTerrain();
 	MgStoneType generateBiomes(float *heat_map, float *humidity_map);
--- a/src/mapgen_v6.cpp
+++ b/src/mapgen_v6.cpp
@ -318,6 +318,17 @@ int MapgenV6::getGroundLevelAtPoint(v2s16 p)
 }


+int MapgenV6::getSpawnLevelAtPoint(v2s16 p)
+{
+	s16 level_at_point = baseTerrainLevelFromNoise(p) + MGV6_AVERAGE_MUD_AMOUNT;
+	if (level_at_point <= water_level ||
+			level_at_point > water_level + 16)
+		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+	else
+		return level_at_point;
+}
+
+
 //////////////////////// Noise functions

 float MapgenV6::getMudAmount(v2s16 p)
--- a/src/mapgen_v6.h
+++ b/src/mapgen_v6.h
@ -129,6 +129,7 @@ public:

 	void makeChunk(BlockMakeData *data);
 	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);

 	float baseTerrainLevel(float terrain_base, float terrain_higher,
 		float steepness, float height_select);
--- a/src/mapgen_v7.cpp
+++ b/src/mapgen_v7.cpp
@ -202,7 +202,7 @@ void MapgenV7Params::writeParams(Settings *settings) const
 ///////////////////////////////////////


-int MapgenV7::getGroundLevelAtPoint(v2s16 p)
+int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 {
 	// Base terrain calculation
 	s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
@ -210,22 +210,24 @@ int MapgenV7::getGroundLevelAtPoint(v2s16 p)
 	// Ridge/river terrain calculation
 	float width = 0.2;
 	float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
-	// actually computing the depth of the ridge is much more expensive;
-	// if inside a river, simply guess
+	// if inside a river this is an unsuitable spawn point
 	if (fabs(uwatern) <= width)
-		return water_level - 10;
+		return MAX_MAP_GENERATION_LIMIT;

 	// Mountain terrain calculation
-	int iters = 128; // don't even bother iterating more than 128 times..
+	int iters = 128;
 	while (iters--) {
-		//current point would have been air
-		if (!getMountainTerrainAtPoint(p.X, y, p.Y))
-			return y;
-
+		if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
+			if (y <= water_level || y > water_level + 16)
+				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+			else
+				return y;
+		}
 		y++;
 	}

-	return y;
+	// Unsuitable spawn point, no ground surface found
+	return MAX_MAP_GENERATION_LIMIT;
 }


--- a/src/mapgen_v7.h
+++ b/src/mapgen_v7.h
@ -103,7 +103,7 @@ public:
 	~MapgenV7();

 	virtual void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);
 	Biome *getBiomeAtPoint(v3s16 p);

 	float baseTerrainLevelAtPoint(s16 x, s16 z);
--- a/src/mapgen_valleys.cpp
+++ b/src/mapgen_valleys.cpp
@ -56,8 +56,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 //Profiler *mapgen_profiler = &mapgen_prof;

 static FlagDesc flagdesc_mapgen_valleys[] = {
-	{"altitude_chill", MG_VALLEYS_ALT_CHILL},
-	{"humid_rivers",   MG_VALLEYS_HUMID_RIVERS},
+	{"altitude_chill", MGVALLEYS_ALT_CHILL},
+	{"humid_rivers",   MGVALLEYS_HUMID_RIVERS},
 	{NULL,             0}
 };

@ -86,8 +86,8 @@ MapgenValleys::MapgenValleys(int mapgenid, MapgenParams *params, EmergeManager *
 	MapgenValleysParams *sp = (MapgenValleysParams *)params->sparams;
 	this->spflags = sp->spflags;

-	this->humid_rivers       = (spflags & MG_VALLEYS_HUMID_RIVERS);
-	this->use_altitude_chill = (spflags & MG_VALLEYS_ALT_CHILL);
+	this->humid_rivers       = (spflags & MGVALLEYS_HUMID_RIVERS);
+	this->use_altitude_chill = (spflags & MGVALLEYS_ALT_CHILL);

 	this->altitude_chill     = sp->altitude_chill;
 	this->humidity_adjust    = params->np_biome_humidity.offset - 50.f;
@ -181,7 +181,7 @@ MapgenValleys::~MapgenValleys()

 MapgenValleysParams::MapgenValleysParams()
 {
-	spflags = MG_VALLEYS_HUMID_RIVERS | MG_VALLEYS_ALT_CHILL;
+	spflags = MGVALLEYS_HUMID_RIVERS | MGVALLEYS_ALT_CHILL;

 	altitude_chill     = 90; // The altitude at which temperature drops by 20C.
 	large_cave_depth   = -33;
@ -513,24 +513,19 @@ float MapgenValleys::adjustedTerrainLevelFromNoise(TerrainNoise *tn)
 }


-int MapgenValleys::getGroundLevelAtPoint(v2s16 p)
+int MapgenValleys::getSpawnLevelAtPoint(v2s16 p)
 {
-	// ***********************************
-	// This method (deliberately) does not
-	// return correct terrain values.
-	// ***********************************
-
-	// Since MT doesn't normally deal with rivers, check
-	// to make sure this isn't a request for a location
-	// in a river.
+	// Check to make sure this isn't a request for a location in a river.
 	float rivers = NoisePerlin2D(&noise_rivers->np, p.X, p.Y, seed);
-
-	// If it's wet, return an unusable number.
 	if (fabs(rivers) < river_size_factor)
-		return MAX_MAP_GENERATION_LIMIT;
+		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point

-	// Otherwise, return the real result.
-	return terrainLevelAtPoint(p.X, p.Y);
+	s16 level_at_point = terrainLevelAtPoint(p.X, p.Y);
+	if (level_at_point <= water_level ||
+			level_at_point > water_level + 16)
+		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+	else
+		return level_at_point;
 }


--- a/src/mapgen_valleys.h
+++ b/src/mapgen_valleys.h
@ -30,9 +30,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,

 #include "mapgen.h"

-/////////////////// Mapgen Valleys flags
-#define MG_VALLEYS_ALT_CHILL    0x01
-#define MG_VALLEYS_HUMID_RIVERS 0x02
+////////////// Mapgen Valleys flags
+#define MGVALLEYS_ALT_CHILL    0x01
+#define MGVALLEYS_HUMID_RIVERS 0x02

 // Feed only one variable into these.
 #define MYSQUARE(x) (x) * (x)
@ -96,7 +96,7 @@ public:
 	~MapgenValleys();

 	virtual void makeChunk(BlockMakeData *data);
-	int getGroundLevelAtPoint(v2s16 p);
+	int getSpawnLevelAtPoint(v2s16 p);

 	s16 large_cave_depth;

--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@ -104,7 +104,7 @@ void scaleMesh(scene::IMesh *mesh, v3f scale)
 	if (mesh == NULL)
 		return;

-	core::aabbox3d<f32> bbox;
+	aabb3f bbox;
 	bbox.reset(0, 0, 0);

 	u32 mc = mesh->getMeshBufferCount();
@ -132,7 +132,7 @@ void translateMesh(scene::IMesh *mesh, v3f vec)
 	if (mesh == NULL)
 		return;

-	core::aabbox3d<f32> bbox;
+	aabb3f bbox;
 	bbox.reset(0, 0, 0);

 	u32 mc = mesh->getMeshBufferCount();
@ -346,7 +346,7 @@ void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)

 void recalculateBoundingBox(scene::IMesh *src_mesh)
 {
-	core::aabbox3d<f32> bbox;
+	aabb3f bbox;
 	bbox.reset(0,0,0);
 	for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
 		scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
@ -406,7 +406,7 @@ scene::IMesh* cloneMesh(scene::IMesh *src_mesh)
 }

 scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
-		const f32 *uv_coords)
+		const f32 *uv_coords, float expand)
 {
 	scene::SMesh* dst_mesh = new scene::SMesh();

@ -421,31 +421,19 @@ scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,

 	video::SColor c(255,255,255,255);	

-	for(std::vector<aabb3f>::const_iterator
+	for (std::vector<aabb3f>::const_iterator
 			i = boxes.begin();
 			i != boxes.end(); ++i)
 	{
 		aabb3f box = *i;
+		box.repair();

-		f32 temp;
-		if (box.MinEdge.X > box.MaxEdge.X)
-			{
-				temp=box.MinEdge.X;
-				box.MinEdge.X=box.MaxEdge.X;
-				box.MaxEdge.X=temp;
-			}
-		if (box.MinEdge.Y > box.MaxEdge.Y)
-			{
-				temp=box.MinEdge.Y;
-				box.MinEdge.Y=box.MaxEdge.Y;
-				box.MaxEdge.Y=temp;
-			}
-		if (box.MinEdge.Z > box.MaxEdge.Z)
-			{
-				temp=box.MinEdge.Z;
-				box.MinEdge.Z=box.MaxEdge.Z;
-				box.MaxEdge.Z=temp;
-			}
+		box.MinEdge.X -= expand;
+		box.MinEdge.Y -= expand;
+		box.MinEdge.Z -= expand;
+		box.MaxEdge.X += expand;
+		box.MaxEdge.Y += expand;
+		box.MaxEdge.Z += expand;

 		// Compute texture UV coords
 		f32 tx1 = (box.MinEdge.X / BS) + 0.5;
--- a/src/mesh.h
+++ b/src/mesh.h
@ -86,9 +86,10 @@ scene::IMesh* cloneMesh(scene::IMesh *src_mesh);
 	Convert nodeboxes to mesh.
 	boxes - set of nodeboxes to be converted into cuboids
 	uv_coords[24] - table of texture uv coords for each cuboid face
+	expand - factor by which cuboids will be resized
 */
 scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
-		const f32 *uv_coords = NULL);
+		const f32 *uv_coords = NULL, float expand = 0);

 /*
 	Update bounding box for a mesh.
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@ -139,7 +139,7 @@ void TileDef::serialize(std::ostream &os, u16 protocol_version) const
 	}
 }

-void TileDef::deSerialize(std::istream &is, bool culling_ignore)
+void TileDef::deSerialize(std::istream &is, const u8 contenfeatures_version, const NodeDrawType drawtype)
 {
 	int version = readU8(is);
 	name = deSerializeString(is);
@ -153,10 +153,12 @@ void TileDef::deSerialize(std::istream &is, bool culling_ignore)
 		tileable_horizontal = readU8(is);
 		tileable_vertical = readU8(is);
 	}
-	// when connecting to old servers - do not use
-	// provided values here since culling needs to be
-	// disabled by default for these drawtypes
-	if (culling_ignore)
+
+	if ((contenfeatures_version < 8) &&
+		((drawtype == NDT_MESH) ||
+		 (drawtype == NDT_FIRELIKE) ||
+		 (drawtype == NDT_LIQUID) ||
+		 (drawtype == NDT_PLANTLIKE)))
 		backface_culling = false;
 }

@ -268,7 +270,8 @@ void ContentFeatures::serialize(std::ostream &os, u16 protocol_version) const
 		return;
 	}

-	writeU8(os, 7); // version
+	writeU8(os, protocol_version < 27 ? 7 : 8);
+
 	os<<serializeString(name);
 	writeU16(os, groups.size());
 	for(ItemGroupList::const_iterator
@ -330,9 +333,11 @@ void ContentFeatures::serialize(std::ostream &os, u16 protocol_version) const
 void ContentFeatures::deSerialize(std::istream &is)
 {
 	int version = readU8(is);
-	if(version != 7){
+	if (version < 7) {
 		deSerializeOld(is, version);
 		return;
+	} else if (version > 8) {
+		throw SerializationError("unsupported ContentFeatures version");
 	}

 	name = deSerializeString(is);
@ -345,21 +350,15 @@ void ContentFeatures::deSerialize(std::istream &is)
 	}
 	drawtype = (enum NodeDrawType)readU8(is);

-	bool ignore_culling = ((version <= 26) &&
-			((drawtype == NDT_MESH) ||
-			 (drawtype == NDT_PLANTLIKE) ||
-			 (drawtype == NDT_FIRELIKE) ||
-			 (drawtype == NDT_LIQUID)));
-
 	visual_scale = readF1000(is);
 	if(readU8(is) != 6)
 		throw SerializationError("unsupported tile count");
 	for(u32 i = 0; i < 6; i++)
-		tiledef[i].deSerialize(is, ignore_culling);
+		tiledef[i].deSerialize(is, version, drawtype);
 	if(readU8(is) != CF_SPECIAL_COUNT)
 		throw SerializationError("unsupported CF_SPECIAL_COUNT");
 	for(u32 i = 0; i < CF_SPECIAL_COUNT; i++)
-		tiledef_special[i].deSerialize(is, ignore_culling);
+		tiledef_special[i].deSerialize(is, version, drawtype);
 	alpha = readU8(is);
 	post_effect_color.setAlpha(readU8(is));
 	post_effect_color.setRed(readU8(is));
@ -1284,21 +1283,15 @@ void ContentFeatures::deSerializeOld(std::istream &is, int version)
 		}
 		drawtype = (enum NodeDrawType)readU8(is);

-		bool ignore_culling = ((version <= 26) &&
-				((drawtype == NDT_MESH) ||
-				(drawtype == NDT_PLANTLIKE) ||
-				(drawtype == NDT_FIRELIKE) ||
-				(drawtype == NDT_LIQUID)));
-
 		visual_scale = readF1000(is);
 		if (readU8(is) != 6)
 			throw SerializationError("unsupported tile count");
 		for (u32 i = 0; i < 6; i++)
-			tiledef[i].deSerialize(is, ignore_culling);
+			tiledef[i].deSerialize(is, version, drawtype);
 		if (readU8(is) != CF_SPECIAL_COUNT)
 			throw SerializationError("unsupported CF_SPECIAL_COUNT");
 		for (u32 i = 0; i < CF_SPECIAL_COUNT; i++)
-			tiledef_special[i].deSerialize(is, ignore_culling);
+			tiledef_special[i].deSerialize(is, version, drawtype);
 		alpha = readU8(is);
 		post_effect_color.setAlpha(readU8(is));
 		post_effect_color.setRed(readU8(is));
@ -1342,12 +1335,12 @@ void ContentFeatures::deSerializeOld(std::istream &is, int version)
 		if (readU8(is) != 6)
 			throw SerializationError("unsupported tile count");
 		for (u32 i = 0; i < 6; i++)
-			tiledef[i].deSerialize(is, drawtype);
+			tiledef[i].deSerialize(is, version, drawtype);
 		// CF_SPECIAL_COUNT in version 6 = 2
 		if (readU8(is) != 2)
 			throw SerializationError("unsupported CF_SPECIAL_COUNT");
 		for (u32 i = 0; i < 2; i++)
-			tiledef_special[i].deSerialize(is, drawtype);
+			tiledef_special[i].deSerialize(is, version, drawtype);
 		alpha = readU8(is);
 		post_effect_color.setAlpha(readU8(is));
 		post_effect_color.setRed(readU8(is));
--- a/src/nodedef.h
+++ b/src/nodedef.h
@ -104,6 +104,30 @@ struct NodeBox
 struct MapNode;
 class NodeMetadata;

+enum NodeDrawType
+{
+	NDT_NORMAL, // A basic solid block
+	NDT_AIRLIKE, // Nothing is drawn
+	NDT_LIQUID, // Do not draw face towards same kind of flowing/source liquid
+	NDT_FLOWINGLIQUID, // A very special kind of thing
+	NDT_GLASSLIKE, // Glass-like, don't draw faces towards other glass
+	NDT_ALLFACES, // Leaves-like, draw all faces no matter what
+	NDT_ALLFACES_OPTIONAL, // Fancy -> allfaces, fast -> normal
+	NDT_TORCHLIKE,
+	NDT_SIGNLIKE,
+	NDT_PLANTLIKE,
+	NDT_FENCELIKE,
+	NDT_RAILLIKE,
+	NDT_NODEBOX,
+	NDT_GLASSLIKE_FRAMED, // Glass-like, draw connected frames and all all
+	                      // visible faces
+						  // uses 2 textures, one for frames, second for faces
+	NDT_FIRELIKE, // Draw faces slightly rotated and only on connecting nodes,
+	NDT_GLASSLIKE_FRAMED_OPTIONAL,	// enabled -> connected, disabled -> Glass-like
+									// uses 2 textures, one for frames, second for faces
+	NDT_MESH, // Uses static meshes
+};
+
 /*
 	Stand-alone definition of a TileSpec (basically a server-side TileSpec)
 */
@ -137,31 +161,7 @@ struct TileDef
 	}

 	void serialize(std::ostream &os, u16 protocol_version) const;
-	void deSerialize(std::istream &is, bool culling_ignore);
-};
-
-enum NodeDrawType
-{
-	NDT_NORMAL, // A basic solid block
-	NDT_AIRLIKE, // Nothing is drawn
-	NDT_LIQUID, // Do not draw face towards same kind of flowing/source liquid
-	NDT_FLOWINGLIQUID, // A very special kind of thing
-	NDT_GLASSLIKE, // Glass-like, don't draw faces towards other glass
-	NDT_ALLFACES, // Leaves-like, draw all faces no matter what
-	NDT_ALLFACES_OPTIONAL, // Fancy -> allfaces, fast -> normal
-	NDT_TORCHLIKE,
-	NDT_SIGNLIKE,
-	NDT_PLANTLIKE,
-	NDT_FENCELIKE,
-	NDT_RAILLIKE,
-	NDT_NODEBOX,
-	NDT_GLASSLIKE_FRAMED, // Glass-like, draw connected frames and all all
-	                      // visible faces
-						  // uses 2 textures, one for frames, second for faces
-	NDT_FIRELIKE, // Draw faces slightly rotated and only on connecting nodes,
-	NDT_GLASSLIKE_FRAMED_OPTIONAL,	// enabled -> connected, disabled -> Glass-like
-									// uses 2 textures, one for frames, second for faces
-	NDT_MESH, // Uses static meshes
+	void deSerialize(std::istream &is, const u8 contentfeatures_version, const NodeDrawType drawtype);
 };

 #define CF_SPECIAL_COUNT 6
--- a/src/object_properties.h
+++ b/src/object_properties.h
@ -33,7 +33,7 @@ struct ObjectProperties
 	bool physical;
 	bool collideWithObjects;
 	float weight;
-	core::aabbox3d<f32> collisionbox;
+	aabb3f collisionbox;
 	std::string visual;
 	std::string mesh;
 	v2f visual_size;
--- a/src/particles.cpp
+++ b/src/particles.cpp
@ -88,7 +88,7 @@ Particle::Particle(
 	m_vertical = vertical;

 	// Irrlicht stuff
-	m_collisionbox = core::aabbox3d<f32>
+	m_collisionbox = aabb3f
 			(-size/2,-size/2,-size/2,size/2,size/2,size/2);
 	this->setAutomaticCulling(scene::EAC_OFF);

@ -128,7 +128,7 @@ void Particle::step(float dtime)
 	m_time += dtime;
 	if (m_collisiondetection)
 	{
-		core::aabbox3d<f32> box = m_collisionbox;
+		aabb3f box = m_collisionbox;
 		v3f p_pos = m_pos*BS;
 		v3f p_velocity = m_velocity*BS;
 		collisionMoveSimple(m_env, m_gamedef,
--- a/src/particles.h
+++ b/src/particles.h
@ -52,7 +52,7 @@ class Particle : public scene::ISceneNode
 	);
 	~Particle();

-	virtual const core::aabbox3d<f32>& getBoundingBox() const
+	virtual const aabb3f &getBoundingBox() const
 	{
 		return m_box;
 	}
@ -85,8 +85,8 @@ private:

 	ClientEnvironment *m_env;
 	IGameDef *m_gamedef;
-	core::aabbox3d<f32> m_box;
-	core::aabbox3d<f32> m_collisionbox;
+	aabb3f m_box;
+	aabb3f m_collisionbox;
 	video::SMaterial m_material;
 	v2f m_texpos;
 	v2f m_texsize;
--- a/src/player.h
+++ b/src/player.h
@ -198,7 +198,7 @@ public:
 		return m_name;
 	}

-	core::aabbox3d<f32> getCollisionbox()
+	aabb3f getCollisionbox()
 	{
 		return m_collisionbox;
 	}
@ -398,7 +398,7 @@ protected:
 	f32 m_yaw;
 	v3f m_speed;
 	v3f m_position;
-	core::aabbox3d<f32> m_collisionbox;
+	aabb3f m_collisionbox;

 	bool m_dirty;

--- a/src/script/lua_api/l_areastore.cpp
+++ b/src/script/lua_api/l_areastore.cpp
@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_internal.h"
 #include "common/c_converter.h"
 #include "cpp_api/s_security.h"
+#include "irr_v3d.h"
 #include "areastore.h"
 #include "filesys.h"
 #ifndef ANDROID
--- a/src/script/lua_api/l_areastore.h
+++ b/src/script/lua_api/l_areastore.h
@ -21,7 +21,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define L_AREASTORE_H_

 #include "lua_api/l_base.h"
-#include "irr_v3d.h"
 #include "areastore.h"

 /*
--- a/src/script/lua_api/l_env.cpp
+++ b/src/script/lua_api/l_env.cpp
@ -36,6 +36,13 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "emerge.h"
 #include "pathfinder.h"

+struct EnumString ModApiEnvMod::es_ClearObjectsMode[] =
+{
+	{CLEAR_OBJECTS_MODE_FULL,  "full"},
+	{CLEAR_OBJECTS_MODE_QUICK, "quick"},
+	{0, NULL},
+};
+
 ///////////////////////////////////////////////////////////////////////////////


@ -727,13 +734,20 @@ int ModApiEnvMod::l_get_voxel_manip(lua_State *L)
 	return 1;
 }

-// clear_objects()
+// clear_objects([options])
 // clear all objects in the environment
+// where options = {mode = "full" or "quick"}
 int ModApiEnvMod::l_clear_objects(lua_State *L)
 {
 	GET_ENV_PTR;

-	env->clearAllObjects();
+	ClearObjectsMode mode = CLEAR_OBJECTS_MODE_FULL;
+	if (lua_istable(L, 1)) {
+		mode = (ClearObjectsMode)getenumfield(L, 1, "mode",
+			ModApiEnvMod::es_ClearObjectsMode, mode);
+	}
+
+	env->clearObjects(mode);
 	return 0;
 }

--- a/src/script/lua_api/l_env.h
+++ b/src/script/lua_api/l_env.h
@ -170,6 +170,8 @@ private:

 public:
 	static void Initialize(lua_State *L, int top);
+
+	static struct EnumString es_ClearObjectsMode[];
 };

 class LuaABM : public ActiveBlockModifier {
--- a/src/server.cpp
+++ b/src/server.cpp
@ -3376,26 +3376,24 @@ v3f Server::findSpawnPos()
 		return nodeposf * BS;
 	}

-	s16 water_level = map.getWaterLevel();
-	s16 vertical_spawn_range = g_settings->getS16("vertical_spawn_range");
 	bool is_good = false;

 	// Try to find a good place a few times
-	for(s32 i = 0; i < 1000 && !is_good; i++) {
+	for(s32 i = 0; i < 4000 && !is_good; i++) {
 		s32 range = 1 + i;
 		// We're going to try to throw the player to this position
 		v2s16 nodepos2d = v2s16(
 				-range + (myrand() % (range * 2)),
 				-range + (myrand() % (range * 2)));

-		// Get ground height at point
-		s16 groundheight = map.findGroundLevel(nodepos2d);
-		// Don't go underwater or to high places
-		if (groundheight <= water_level ||
-				groundheight > water_level + vertical_spawn_range)
+		// Get spawn level at point
+		s16 spawn_level = m_emerge->getSpawnLevelAtPoint(nodepos2d);
+		// Continue if MAX_MAP_GENERATION_LIMIT was returned by
+		// the mapgen to signify an unsuitable spawn position
+		if (spawn_level == MAX_MAP_GENERATION_LIMIT)
 			continue;

-		v3s16 nodepos(nodepos2d.X, groundheight, nodepos2d.Y);
+		v3s16 nodepos(nodepos2d.X, spawn_level, nodepos2d.Y);

 		s32 air_count = 0;
 		for (s32 i = 0; i < 10; i++) {
--- a/src/shader.cpp
+++ b/src/shader.cpp
@ -764,22 +764,25 @@ ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
 	else
 		shaders_header += "0\n";

-	if(pixel_program != "")
-		pixel_program = shaders_header + pixel_program;
-	if(vertex_program != "")
-		vertex_program = shaders_header + vertex_program;
-	if(geometry_program != "")
-		geometry_program = shaders_header + geometry_program;
+	if (g_settings->getBool("tone_mapping"))
+		shaders_header += "#define ENABLE_TONE_MAPPING\n";
+
 	// Call addHighLevelShaderMaterial() or addShaderMaterial()
 	const c8* vertex_program_ptr = 0;
 	const c8* pixel_program_ptr = 0;
 	const c8* geometry_program_ptr = 0;
-	if(vertex_program != "")
+	if (!vertex_program.empty()) {
+		vertex_program = shaders_header + vertex_program;
 		vertex_program_ptr = vertex_program.c_str();
-	if(pixel_program != "")
+	}
+	if (!pixel_program.empty()) {
+		pixel_program = shaders_header + pixel_program;
 		pixel_program_ptr = pixel_program.c_str();
-	if(geometry_program != "")
+	}
+	if (!geometry_program.empty()) {
+		geometry_program = shaders_header + geometry_program;
 		geometry_program_ptr = geometry_program.c_str();
+	}
 	s32 shadermat = -1;
 	if(is_highlevel){
 		infostream<<"Compiling high level shaders for "<<name<<std::endl;
@ -789,7 +792,7 @@ ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
 			video::EVST_VS_1_1,   // Vertex shader version
 			pixel_program_ptr,    // Pixel shader program
 			"pixelMain",          // Pixel shader entry point
-			video::EPST_PS_1_1,   // Pixel shader version
+			video::EPST_PS_1_2,   // Pixel shader version
 			geometry_program_ptr, // Geometry shader program
 			"geometryMain",       // Geometry shader entry point
 			video::EGST_GS_4_0,   // Geometry shader version
@ -805,6 +808,9 @@ ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
 					"failed to generate \""<<name<<"\", "
 					"addHighLevelShaderMaterial failed."
 					<<std::endl;
+			dumpShaderProgram(warningstream, "Vertex", vertex_program);
+			dumpShaderProgram(warningstream, "Pixel", pixel_program);
+			dumpShaderProgram(warningstream, "Geometry", geometry_program);
 			return shaderinfo;
 		}
 	}
@ -823,6 +829,8 @@ ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
 					"failed to generate \""<<name<<"\", "
 					"addShaderMaterial failed."
 					<<std::endl;
+			dumpShaderProgram(warningstream, "Vertex", vertex_program);
+			dumpShaderProgram(warningstream,"Pixel", pixel_program);
 			return shaderinfo;
 		}
 	}
@ -868,3 +876,21 @@ void load_shaders(std::string name, SourceShaderCache *sourcecache,
 	}

 }
+
+void dumpShaderProgram(std::ostream &output_stream,
+		const std::string &program_type, const std::string &program)
+{
+	output_stream << program_type << " shader program:" << std::endl <<
+		"----------------------------------" << std::endl;
+	size_t pos = 0;
+	size_t prev = 0;
+	s16 line = 1;
+	while ((pos = program.find("\n", prev)) != std::string::npos) {
+		output_stream << line++ << ": "<< program.substr(prev, pos - prev) <<
+			std::endl;
+		prev = pos + 1;
+	}
+	output_stream << line << ": " << program.substr(prev) << std::endl <<
+		"End of " << program_type << " shader program." << std::endl <<
+		" " << std::endl;
+}
--- a/src/shader.h
+++ b/src/shader.h
@ -110,4 +110,7 @@ public:

 IWritableShaderSource* createShaderSource(IrrlichtDevice *device);

+void dumpShaderProgram(std::ostream &output_stream,
+	const std::string &program_type, const std::string &program);
+
 #endif
--- a/src/sky.cpp
+++ b/src/sky.cpp
@ -25,8 +25,8 @@ Sky::Sky(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id,
 		m_cloudcolor_bright_f(1,1,1,1)
 {
 	setAutomaticCulling(scene::EAC_OFF);
-	Box.MaxEdge.set(0,0,0);
-	Box.MinEdge.set(0,0,0);
+	m_box.MaxEdge.set(0,0,0);
+	m_box.MinEdge.set(0,0,0);

 	// create material

@ -94,11 +94,6 @@ void Sky::OnRegisterSceneNode()
 	scene::ISceneNode::OnRegisterSceneNode();
 }

-const core::aabbox3d<f32>& Sky::getBoundingBox() const
-{
-	return Box;
-}
-
 //! renders the node.
 void Sky::render()
 {
--- a/src/sky.h
+++ b/src/sky.h
@ -42,7 +42,8 @@ public:
 	//! renders the node.
 	virtual void render();

-	virtual const core::aabbox3d<f32>& getBoundingBox() const;
+	virtual const aabb3f &getBoundingBox() const
+	{ return m_box; }

 	// Used by Irrlicht for optimizing rendering
 	virtual video::SMaterial& getMaterial(u32 i)
@ -74,7 +75,7 @@ public:
 	}

 private:
-	core::aabbox3d<f32> Box;
+	aabb3f m_box;
 	video::SMaterial m_materials[SKY_MATERIAL_COUNT];

 	// How much sun & moon transition should affect horizon color
--- a/src/util/numeric.h
+++ b/src/util/numeric.h
@ -310,9 +310,9 @@ inline v3f intToFloat(v3s16 p, f32 d)
 }

 // Random helper. Usually d=BS
-inline core::aabbox3d<f32> getNodeBox(v3s16 p, float d)
+inline aabb3f getNodeBox(v3s16 p, float d)
 {
-	return core::aabbox3d<f32>(
+	return aabb3f(
 		(float)p.X * d - 0.5*d,
 		(float)p.Y * d - 0.5*d,
 		(float)p.Z * d - 0.5*d,
--- a/src/wieldmesh.h
+++ b/src/wieldmesh.h
@ -53,7 +53,7 @@ public:

 	virtual void render();

-	virtual const core::aabbox3d<f32>& getBoundingBox() const
+	virtual const aabb3f &getBoundingBox() const
 	{ return m_bounding_box; }

 private:
@ -74,7 +74,7 @@ private:
 	// Bounding box culling is disabled for this type of scene node,
 	// so this variable is just required so we can implement
 	// getBoundingBox() and is set to an empty box.
-	core::aabbox3d<f32> m_bounding_box;
+	aabb3f m_bounding_box;
 };

 scene::IMesh *getItemMesh(IGameDef *gamedef, const ItemStack &item);