Merge remote-tracking branch 'upstream/master'

CMakeLists.txt

@@ -131,6 +131,7 @@ if(NOT CUSTOM_LOCALEDIR STREQUAL "")
 endif()
 
 install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/builtin" DESTINATION "${SHAREDIR}")
+install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/client" DESTINATION "${SHAREDIR}")
 install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/games/minimal" DESTINATION "${SHAREDIR}/games")
 set(MINETEST_GAME_SOURCE "${CMAKE_CURRENT_SOURCE_DIR}/games/minetest_game")
 if(EXISTS ${MINETEST_GAME_SOURCE} AND IS_DIRECTORY ${MINETEST_GAME_SOURCE})

builtin/falling.lua

@@ -91,6 +91,48 @@ function spawn_falling_node(p, nodename)
 	obj:get_luaentity():set_node(nodename)
 end
 
+function drop_attached_node(p)
+	local nn = minetest.env:get_node(p).name
+	minetest.env:remove_node(p)
+	for _,item in ipairs(minetest.get_node_drops(nn, "")) do
+		local pos = {
+			x = p.x + math.random(60)/60-0.3,
+			y = p.y + math.random(60)/60-0.3,
+			z = p.z + math.random(60)/60-0.3,
+		}
+		minetest.env:add_item(pos, item)
+	end
+end
+
+function check_attached_node(p, n)
+	local def = minetest.registered_nodes[n.name]
+	local d = {x=0, y=0, z=0}
+	if def.paramtype2 == "wallmounted" then
+		if n.param2 == 0 then
+			d.y = 1
+		elseif n.param2 == 1 then
+			d.y = -1
+		elseif n.param2 == 2 then
+			d.x = 1
+		elseif n.param2 == 3 then
+			d.x = -1
+		elseif n.param2 == 4 then
+			d.z = 1
+		elseif n.param2 == 5 then
+			d.z = -1
+		end
+	else
+		d.y = -1
+	end
+	local p2 = {x=p.x+d.x, y=p.y+d.y, z=p.z+d.z}
+	local nn = minetest.env:get_node(p2).name
+	local def2 = minetest.registered_nodes[nn]
+	if def2 and not def2.walkable then
+		return false
+	end
+	return true
+end
+
 --
 -- Some common functions
 --
@@ -108,6 +150,13 @@ function nodeupdate_single(p)
 			nodeupdate(p)
 		end
 	end
+	
+	if minetest.get_node_group(n.name, "attached_node") ~= 0 then
+		if not check_attached_node(p, n) then
+			drop_attached_node(p)
+			nodeupdate(p)
+		end
+	end
 end
 
 function nodeupdate(p)

builtin/item.lua

@@ -181,6 +181,14 @@ function minetest.item_place_node(itemstack, placer, pointed_thing)
 		end
 	end
 
+	-- Check if the node is attached and if it can be placed there
+	if minetest.get_item_group(def.name, "attached_node") ~= 0 and
+		not check_attached_node(place_to, newnode) then
+		minetest.log("action", "attached node " .. def.name ..
+			" can not be placed at " .. minetest.pos_to_string(place_to))
+		return
+	end
+
 	-- Add node and update
 	minetest.env:add_node(place_to, newnode)
 

client/shaders/test_shader_1/base.txt

@@ -0,0 +1 @@
+trans_alphach_ref

client/shaders/test_shader_1/opengl_fragment.glsl

@@ -0,0 +1,25 @@
+
+uniform sampler2D myTexture;
+uniform vec4 skyBgColor;
+uniform float fogDistance;
+
+varying vec3 vPosition;
+
+void main (void)
+{
+    //vec4 col = vec4(1.0, 0.0, 0.0, 1.0);
+    vec4 col = texture2D(myTexture, vec2(gl_TexCoord[0]));
+	float a = col.a;
+    col *= gl_Color;
+	col = col * col; // SRGB -> Linear
+	col *= 1.8;
+	col.r = 1.0 - exp(1.0 - col.r) / exp(1.0);
+	col.g = 1.0 - exp(1.0 - col.g) / exp(1.0);
+	col.b = 1.0 - exp(1.0 - col.b) / exp(1.0);
+	col = sqrt(col); // Linear -> SRGB
+	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.r, col.g, col.b, a);
+}

client/shaders/test_shader_1/opengl_vertex.glsl

@@ -0,0 +1,25 @@
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+
+varying vec3 vPosition;
+
+void main(void)
+{
+	gl_Position = mWorldViewProj * gl_Vertex;
+
+	vPosition = (mWorldViewProj * gl_Vertex).xyz;
+
+	if(gl_Normal.y > 0.5)
+		gl_FrontColor = gl_BackColor = gl_Color;
+	else
+		gl_FrontColor = gl_BackColor = gl_Color * 0.7;
+
+	/*if(gl_Normal.y > 0.5)
+		gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0);
+	else
+		gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0) * 0.7;*/
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+}

client/shaders/test_shader_2/base.txt

@@ -0,0 +1 @@
+trans_alphach

client/shaders/test_shader_2/opengl_fragment.glsl

@@ -0,0 +1,23 @@
+
+uniform sampler2D myTexture;
+uniform float fogDistance;
+
+varying vec3 vPosition;
+
+void main (void)
+{
+    vec4 col = texture2D(myTexture, vec2(gl_TexCoord[0]));
+    col *= gl_Color;
+	float a = gl_Color.a;
+	col = col * col; // SRGB -> Linear
+	col *= 1.8;
+	col.r = 1.0 - exp(1.0 - col.r) / exp(1.0);
+	col.g = 1.0 - exp(1.0 - col.g) / exp(1.0);
+	col.b = 1.0 - exp(1.0 - col.b) / exp(1.0);
+	col = sqrt(col); // Linear -> SRGB
+	if(fogDistance != 0.0){
+		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
+		a = mix(a, 0.0, d);
+	}
+	gl_FragColor = vec4(col.r, col.g, col.b, a);
+}

client/shaders/test_shader_2/opengl_vertex.glsl

@@ -0,0 +1,20 @@
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+
+varying vec3 vPosition;
+
+void main(void)
+{
+	vec4 pos = gl_Vertex;
+	pos.y -= 2.0;
+	gl_Position = mWorldViewProj * pos;
+
+	vPosition = (mWorldViewProj * gl_Vertex).xyz;
+
+	gl_FrontColor = gl_BackColor = gl_Color;
+	//gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0);
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+}

doc/lua_api.txt

@@ -457,6 +457,9 @@ Special groups
 - fall_damage_add_percent: damage speed = speed * (1 + value/100)
 - bouncy: value is bounce speed in percent
 - falling_node: if there is no walkable block under the node it will fall
+- attached_node: if the node under it is not a walkable block the node will be
+                  dropped as an item. If the node is wallmounted the
+                  wallmounted direction is checked.
 
 Known damage and digging time defining groups
 ----------------------------------------------
@@ -694,6 +697,10 @@ image[<X>,<Y>;<W>,<H>;<texture name>]
 ^ Show an image
 ^ Position and size units are inventory slots
 
+item_image[<X>,<Y>;<W>,<H>;<item name>]
+^ Show an inventory image of registered item/node
+^ Position and size units are inventory slots
+
 background[<X>,<Y>;<W>,<H>;<texture name>]
 ^ Use a background. Inventory rectangles are not drawn then.
 ^ Position and size units are inventory slots
@@ -735,6 +742,12 @@ image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]
 ^ image is the filename of an image
 ^ Position and size units are inventory slots
 
+item_image_button[<X>,<Y>;<W>,<H>;<item name>;<name>;<label>]
+^ x, y, w, h, name and label work as per button
+^ item name is the registered name of an item/node,
+  tooltip will be made out of its descritption
+^ Position and size units are inventory slots
+
 button_exit[<X>,<Y>;<W>,<H>;<name>;<label>]
 ^ When clicked, fields will be sent and the form will quit.
 

games/minimal/mods/default/init.lua

@@ -837,7 +837,7 @@ minetest.register_node("default:junglegrass", {
 	wield_image = "default_junglegrass.png",
 	paramtype = "light",
 	walkable = false,
-	groups = {snappy=3},
+	groups = {snappy=3,attached_node=1},
 	sounds = default.node_sound_leaves_defaults(),
 })
 
@@ -1106,7 +1106,7 @@ minetest.register_node("default:torch", {
 		wall_bottom = {-0.1, -0.5, -0.1, 0.1, -0.5+0.6, 0.1},
 		wall_side = {-0.5, -0.3, -0.1, -0.5+0.3, 0.3, 0.1},
 	},
-	groups = {choppy=2,dig_immediate=3},
+	groups = {choppy=2,dig_immediate=3,attached_node=1},
 	legacy_wallmounted = true,
 	sounds = default.node_sound_defaults(),
 })
@@ -1127,7 +1127,7 @@ minetest.register_node("default:sign_wall", {
 		--wall_bottom = <default>
 		--wall_side = <default>
 	},
-	groups = {choppy=2,dig_immediate=2},
+	groups = {choppy=2,dig_immediate=2,attached_node=1},
 	legacy_wallmounted = true,
 	sounds = default.node_sound_defaults(),
 	on_construct = function(pos)
@@ -1495,7 +1495,7 @@ minetest.register_node("default:sapling", {
 	wield_image = "default_sapling.png",
 	paramtype = "light",
 	walkable = false,
-	groups = {snappy=2,dig_immediate=3},
+	groups = {snappy=2,dig_immediate=3,attached_node=1},
 	sounds = default.node_sound_defaults(),
 })
 

minetest.conf.example

@@ -117,6 +117,9 @@
 #screenshot_path = .
 # Amount of view bobbing (0 = no view bobbing, 1.0 = normal, 2.0 = double)
 #view_bobbing_amount = 1.0
+# Anaglyph stereo
+#anaglyph = false
+#anaglyph_strength = 0.1
 # In-game chat console background color (R,G,B)
 #console_color = (0,0,0)
 # In-game chat console background alpha (opaqueness, between 0 and 255)
@@ -126,6 +129,17 @@
 #sound_volume = 0.7
 # Whether node texture animations should be desynchronized per MapBlock
 #desynchronize_mapblock_texture_animation = true
+# Texture filtering settings
+#mip_map = false
+#anisotropic_filter = false
+#bilinear_filter = false
+#trilinear_filter = false
+# Set to true to pre-generate all item visuals
+#preload_item_visuals = false
+# 0: disable shaders
+# (1: low level shaders; not implemented)
+# 2: enable high level shaders
+#enable_shaders = 2
 
 #
 # Server stuff

src/CMakeLists.txt

@@ -262,6 +262,7 @@ set(minetest_SRCS
 	client.cpp
 	filecache.cpp
 	tile.cpp
+	shader.cpp
 	game.cpp
 	main.cpp
 )

src/camera.cpp

@@ -189,7 +189,7 @@ void Camera::step(f32 dtime)
 
 	if (m_digging_button != -1)
 	{
-		f32 offset = dtime * 4.5;
+		f32 offset = dtime * 3.5;
 		float m_digging_anim_was = m_digging_anim;
 		m_digging_anim += offset;
 		if (m_digging_anim >= 1)
@@ -529,7 +529,7 @@ void Camera::setDigging(s32 button)
 void Camera::wield(const ItemStack &item)
 {
 	IItemDefManager *idef = m_gamedef->idef();
-	scene::IMesh *wield_mesh = item.getDefinition(idef).wield_mesh;
+	scene::IMesh *wield_mesh = idef->getWieldMesh(item.getDefinition(idef).name, m_gamedef);
 	if(wield_mesh)
 	{
 		m_wieldnode->setMesh(wield_mesh);

src/client.cpp

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodemetadata.h"
 #include "nodedef.h"
 #include "itemdef.h"
+#include "shader.h"
 #include <IFileSystem.h>
 #include "sha1.h"
 #include "base64.h"
@@ -228,12 +229,14 @@ Client::Client(
 		std::string password,
 		MapDrawControl &control,
 		IWritableTextureSource *tsrc,
+		IWritableShaderSource *shsrc,
 		IWritableItemDefManager *itemdef,
 		IWritableNodeDefManager *nodedef,
 		ISoundManager *sound,
 		MtEventManager *event
 ):
 	m_tsrc(tsrc),
+	m_shsrc(shsrc),
 	m_itemdef(itemdef),
 	m_nodedef(nodedef),
 	m_sound(sound),
@@ -1468,8 +1471,8 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 
 		int num_files = readU16(is);
 		
-		verbosestream<<"Client received TOCLIENT_ANNOUNCE_MEDIA ("
-				<<num_files<<" files)"<<std::endl;
+		infostream<<"Client: Received media announcement: packet size: "
+				<<datasize<<std::endl;
 
 		core::list<MediaRequest> file_requests;
 
@@ -2438,7 +2441,7 @@ ClientEvent Client::getClientEvent()
 
 void Client::afterContentReceived()
 {
-	verbosestream<<"Client::afterContentReceived() started"<<std::endl;
+	infostream<<"Client::afterContentReceived() started"<<std::endl;
 	assert(m_itemdef_received);
 	assert(m_nodedef_received);
 	assert(m_media_received);
@@ -2448,31 +2451,43 @@ void Client::afterContentReceived()
 	m_media_name_sha1_map.clear();
 
 	// Rebuild inherited images and recreate textures
-	verbosestream<<"Rebuilding images and textures"<<std::endl;
+	infostream<<"- Rebuilding images and textures"<<std::endl;
 	m_tsrc->rebuildImagesAndTextures();
 
 	// Update texture atlas
-	verbosestream<<"Updating texture atlas"<<std::endl;
+	infostream<<"- Updating texture atlas"<<std::endl;
 	if(g_settings->getBool("enable_texture_atlas"))
 		m_tsrc->buildMainAtlas(this);
 
+	// Rebuild shaders
+	m_shsrc->rebuildShaders();
+
 	// Update node aliases
-	verbosestream<<"Updating node aliases"<<std::endl;
+	infostream<<"- Updating node aliases"<<std::endl;
 	m_nodedef->updateAliases(m_itemdef);
 
 	// Update node textures
-	verbosestream<<"Updating node textures"<<std::endl;
+	infostream<<"- Updating node textures"<<std::endl;
 	m_nodedef->updateTextures(m_tsrc);
 
-	// Update item textures and meshes
-	verbosestream<<"Updating item textures and meshes"<<std::endl;
-	m_itemdef->updateTexturesAndMeshes(this);
+	// Preload item textures and meshes if configured to
+	if(g_settings->getBool("preload_item_visuals"))
+	{
+		verbosestream<<"Updating item textures and meshes"<<std::endl;
+		std::set<std::string> names = m_itemdef->getAll();
+		for(std::set<std::string>::const_iterator
+				i = names.begin(); i != names.end(); ++i){
+			// Asking for these caches the result
+			m_itemdef->getInventoryTexture(*i, this);
+			m_itemdef->getWieldMesh(*i, this);
+		}
+	}
 
 	// Start mesh update thread after setting up content definitions
-	verbosestream<<"Starting mesh update thread"<<std::endl;
+	infostream<<"- Starting mesh update thread"<<std::endl;
 	m_mesh_update_thread.Start();
 	
-	verbosestream<<"Client::afterContentReceived() done"<<std::endl;
+	infostream<<"Client::afterContentReceived() done"<<std::endl;
 }
 
 float Client::getRTT(void)
@@ -2503,6 +2518,10 @@ ITextureSource* Client::getTextureSource()
 {
 	return m_tsrc;
 }
+IShaderSource* Client::getShaderSource()
+{
+	return m_shsrc;
+}
 u16 Client::allocateUnknownNodeId(const std::string &name)
 {
 	errorstream<<"Client::allocateUnknownNodeId(): "

src/client.h

@@ -39,6 +39,7 @@ struct MeshMakeData;
 class MapBlockMesh;
 class IGameDef;
 class IWritableTextureSource;
+class IWritableShaderSource;
 class IWritableItemDefManager;
 class IWritableNodeDefManager;
 //class IWritableCraftDefManager;
@@ -174,6 +175,7 @@ public:
 			std::string password,
 			MapDrawControl &control,
 			IWritableTextureSource *tsrc,
+			IWritableShaderSource *shsrc,
 			IWritableItemDefManager *itemdef,
 			IWritableNodeDefManager *nodedef,
 			ISoundManager *sound,
@@ -305,6 +307,7 @@ public:
 	virtual INodeDefManager* getNodeDefManager();
 	virtual ICraftDefManager* getCraftDefManager();
 	virtual ITextureSource* getTextureSource();
+	virtual IShaderSource* getShaderSource();
 	virtual u16 allocateUnknownNodeId(const std::string &name);
 	virtual ISoundManager* getSoundManager();
 	virtual MtEventManager* getEventManager();
@@ -337,6 +340,7 @@ private:
 	IntervalLimiter m_map_timer_and_unload_interval;
 
 	IWritableTextureSource *m_tsrc;
+	IWritableShaderSource *m_shsrc;
 	IWritableItemDefManager *m_itemdef;
 	IWritableNodeDefManager *m_nodedef;
 	ISoundManager *m_sound;

src/content_cao.cpp

@@ -472,7 +472,7 @@ void ItemCAO::updateTexture()
 		IItemDefManager *idef = m_gamedef->idef();
 		ItemStack item;
 		item.deSerialize(is, idef);
-		texture = item.getDefinition(idef).inventory_texture;
+		texture = idef->getInventoryTexture(item.getDefinition(idef).name, m_gamedef);
 	}
 	catch(SerializationError &e)
 	{
@@ -957,7 +957,7 @@ public:
 				infostream<<"textures[0]: "<<m_prop.textures[0]<<std::endl;
 				IItemDefManager *idef = m_gamedef->idef();
 				ItemStack item(m_prop.textures[0], 1, 0, "", idef);
-				scene::IMesh *item_mesh = item.getDefinition(idef).wield_mesh;
+				scene::IMesh *item_mesh = idef->getWieldMesh(item.getDefinition(idef).name, m_gamedef);
 				
 				// Copy mesh to be able to set unique vertex colors
 				scene::IMeshManipulator *manip =

src/defaultsettings.cpp

@@ -52,7 +52,10 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("keymap_toggle_profiler", "KEY_F6");
 	settings->setDefault("keymap_increase_viewing_range_min", "+");
 	settings->setDefault("keymap_decrease_viewing_range_min", "-");
+	settings->setDefault("anaglyph", "false");
+	settings->setDefault("anaglyph_strength", "0.1");
 	settings->setDefault("aux1_descends", "false");
+
 	// Some (temporary) keys for debugging
 	settings->setDefault("keymap_print_debug_stacks", "KEY_KEY_P");
 	settings->setDefault("keymap_quicktune_prev", "KEY_HOME");
@@ -89,6 +92,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("smooth_lighting", "true");
 	settings->setDefault("enable_texture_atlas", "true");
 	settings->setDefault("texture_path", "");
+	settings->setDefault("shader_path", "");
 	settings->setDefault("video_driver", "opengl");
 	settings->setDefault("free_move", "false");
 	settings->setDefault("continuous_forward", "false");
@@ -110,6 +114,8 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("anisotropic_filter", "false");
 	settings->setDefault("bilinear_filter", "false");
 	settings->setDefault("trilinear_filter", "false");
+	settings->setDefault("preload_item_visuals", "false");
+	settings->setDefault("enable_shaders", "2");
 
 	// Server stuff
 	// "map-dir" doesn't exist by default.

src/game.cpp

@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IGUIButton.h>
 #include <IGUIStaticText.h>
 #include <IGUIFont.h>
+#include <IMaterialRendererServices.h>
 #include "client.h"
 #include "server.h"
 #include "guiPauseMenu.h"
@@ -50,6 +51,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "main.h" // For g_settings
 #include "itemdef.h"
 #include "tile.h" // For TextureSource
+#include "shader.h" // For ShaderSource
 #include "logoutputbuffer.h"
 #include "subgame.h"
 #include "quicktune_shortcutter.h"
@@ -834,6 +836,49 @@ public:
 	}
 };
 
+class GameGlobalShaderConstantSetter : public IShaderConstantSetter
+{
+	Sky *m_sky;
+	bool *m_force_fog_off;
+	f32 *m_fog_range;
+
+public:
+	GameGlobalShaderConstantSetter(Sky *sky, bool *force_fog_off,
+			f32 *fog_range):
+		m_sky(sky),
+		m_force_fog_off(force_fog_off),
+		m_fog_range(fog_range)
+	{}
+	~GameGlobalShaderConstantSetter() {}
+
+	virtual void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel)
+	{
+		if(!is_highlevel)
+			return;
+
+		// Background color
+		video::SColor bgcolor = m_sky->getBgColor();
+		video::SColorf bgcolorf(bgcolor);
+		float bgcolorfa[4] = {
+			bgcolorf.r,
+			bgcolorf.g,
+			bgcolorf.b,
+			bgcolorf.a,
+		};
+		services->setPixelShaderConstant("skyBgColor", bgcolorfa, 4);
+
+		// Fog distance
+		float fog_distance = *m_fog_range;
+		if(*m_force_fog_off)
+			fog_distance = 10000*BS;
+		services->setPixelShaderConstant("fogDistance", &fog_distance, 1);
+	}
+
+private:
+	IrrlichtDevice *m_device;
+};
+
 void the_game(
 	bool &kill,
 	bool random_input,
@@ -876,6 +921,9 @@ void the_game(
 	// Create texture source
 	IWritableTextureSource *tsrc = createTextureSource(device);
 	
+	// Create shader source
+	IWritableShaderSource *shsrc = createShaderSource(device);
+	
 	// These will be filled by data received from the server
 	// Create item definition manager
 	IWritableItemDefManager *itemdef = createItemDefManager();
@@ -943,7 +991,7 @@ void the_game(
 	MapDrawControl draw_control;
 
 	Client client(device, playername.c_str(), password, draw_control,
-			tsrc, itemdef, nodedef, sound, &eventmgr);
+			tsrc, shsrc, itemdef, nodedef, sound, &eventmgr);
 	
 	// Client acts as our GameDef
 	IGameDef *gamedef = &client;
@@ -1246,6 +1294,7 @@ void the_game(
 	bool show_hud = true;
 	bool show_chat = true;
 	bool force_fog_off = false;
+	f32 fog_range = 100*BS;
 	bool disable_camera_update = false;
 	bool show_debug = g_settings->getBool("show_debug");
 	bool show_profiler_graph = false;
@@ -1255,6 +1304,12 @@ void the_game(
 	float time_of_day = 0;
 	float time_of_day_smooth = 0;
 
+	/*
+		Shader constants
+	*/
+	shsrc->addGlobalConstantSetter(
+			new GameGlobalShaderConstantSetter(sky, &force_fog_off, &fog_range));
+
 	/*
 		Main loop
 	*/
@@ -1416,11 +1471,17 @@ void the_game(
 			g_gamecallback->changepassword_requested = false;
 		}
 
-		/*
-			Process TextureSource's queue
-		*/
+		/* Process TextureSource's queue */
 		tsrc->processQueue();
 
+		/* Process ItemDefManager's queue */
+		itemdef->processQueue(gamedef);
+
+		/*
+			Process ShaderSource's queue
+		*/
+		shsrc->processQueue();
+
 		/*
 			Random calculations
 		*/
@@ -2424,7 +2485,6 @@ void the_game(
 			Fog range
 		*/
 	
-		f32 fog_range;
 		if(farmesh)
 		{
 			fog_range = BS*farmesh_range;
@@ -2750,6 +2810,76 @@ void the_game(
 		{
 			TimeTaker timer("smgr");
 			smgr->drawAll();
+			
+			if(g_settings->getBool("anaglyph"))
+			{
+				irr::core::vector3df oldPosition = camera.getCameraNode()->getPosition();
+				irr::core::vector3df oldTarget   = camera.getCameraNode()->getTarget();
+
+				irr::core::matrix4 startMatrix   = camera.getCameraNode()->getAbsoluteTransformation();
+
+				irr::core::vector3df focusPoint  = (camera.getCameraNode()->getTarget() -
+										 camera.getCameraNode()->getAbsolutePosition()).setLength(1) +
+										 camera.getCameraNode()->getAbsolutePosition() ;
+
+				//Left eye...
+				irr::core::vector3df leftEye;
+				irr::core::matrix4   leftMove;
+
+				leftMove.setTranslation( irr::core::vector3df(-g_settings->getFloat("anaglyph_strength"),0.0f,0.0f) );
+				leftEye=(startMatrix*leftMove).getTranslation();
+
+				//clear the depth buffer, and color
+				driver->beginScene( true, true, irr::video::SColor(0,200,200,255) );
+
+				driver->getOverrideMaterial().Material.ColorMask = irr::video::ECP_RED;
+				driver->getOverrideMaterial().EnableFlags  = irr::video::EMF_COLOR_MASK;
+				driver->getOverrideMaterial().EnablePasses = irr::scene::ESNRP_SKY_BOX + 
+															 irr::scene::ESNRP_SOLID +
+															 irr::scene::ESNRP_TRANSPARENT +
+															 irr::scene::ESNRP_TRANSPARENT_EFFECT +
+															 irr::scene::ESNRP_SHADOW;
+
+				camera.getCameraNode()->setPosition( leftEye );
+				camera.getCameraNode()->setTarget( focusPoint );
+
+				smgr->drawAll(); // 'smgr->drawAll();' may go here
+
+
+				//Right eye...
+				irr::core::vector3df rightEye;
+				irr::core::matrix4   rightMove;
+
+				rightMove.setTranslation( irr::core::vector3df(g_settings->getFloat("anaglyph_strength"),0.0f,0.0f) );
+				rightEye=(startMatrix*rightMove).getTranslation();
+
+				//clear the depth buffer
+				driver->clearZBuffer();
+
+				driver->getOverrideMaterial().Material.ColorMask = irr::video::ECP_GREEN + irr::video::ECP_BLUE;
+				driver->getOverrideMaterial().EnableFlags  = irr::video::EMF_COLOR_MASK;
+				driver->getOverrideMaterial().EnablePasses = irr::scene::ESNRP_SKY_BOX +
+															 irr::scene::ESNRP_SOLID +
+															 irr::scene::ESNRP_TRANSPARENT +
+															 irr::scene::ESNRP_TRANSPARENT_EFFECT +
+															 irr::scene::ESNRP_SHADOW;
+
+				camera.getCameraNode()->setPosition( rightEye );
+				camera.getCameraNode()->setTarget( focusPoint );
+
+				smgr->drawAll(); // 'smgr->drawAll();' may go here
+
+
+				//driver->endScene();
+
+				driver->getOverrideMaterial().Material.ColorMask=irr::video::ECP_ALL;
+				driver->getOverrideMaterial().EnableFlags=0;
+				driver->getOverrideMaterial().EnablePasses=0;
+
+				camera.getCameraNode()->setPosition( oldPosition );
+				camera.getCameraNode()->setTarget( oldTarget );
+			}
+
 			scenetime = timer.stop(true);
 		}
 		
@@ -2931,9 +3061,11 @@ void the_game(
 	
 	if(!sound_is_dummy)
 		delete sound;
+
+	delete tsrc;
+	delete shsrc;
 	delete nodedef;
 	delete itemdef;
-	delete tsrc;
 }
 
 

src/gamedef.h

@@ -28,6 +28,7 @@ class INodeDefManager;
 class ICraftDefManager;
 class ITextureSource;
 class ISoundManager;
+class IShaderSource;
 class MtEventManager;
 class IRollbackReportSink;
 
@@ -48,6 +49,8 @@ public:
 	// This is always thread-safe, but referencing the irrlicht texture
 	// pointers in other threads than main thread will make things explode.
 	virtual ITextureSource* getTextureSource()=0;
+
+	virtual IShaderSource* getShaderSource()=0;
 	
 	// Used for keeping track of names/ids of unknown nodes
 	virtual u16 allocateUnknownNodeId(const std::string &name)=0;
@@ -70,6 +73,7 @@ public:
 	ICraftDefManager* cdef(){return getCraftDefManager();}
 	ITextureSource* tsrc(){return getTextureSource();}
 	ISoundManager* sound(){return getSoundManager();}
+	IShaderSource* shsrc(){return getShaderSource();}
 	MtEventManager* event(){return getEventManager();}
 	IRollbackReportSink* rollback(){return getRollbackReportSink();}
 };

src/guiFormSpecMenu.cpp

@@ -46,7 +46,7 @@ void drawItemStack(video::IVideoDriver *driver,
 		return;
 	
 	const ItemDefinition &def = item.getDefinition(gamedef->idef());
-	video::ITexture *texture = def.inventory_texture;
+	video::ITexture *texture = gamedef->idef()->getInventoryTexture(def.name, gamedef);
 
 	// Draw the inventory texture
 	if(texture != NULL)
@@ -201,6 +201,7 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 	m_inventorylists.clear();
 	m_images.clear();
 	m_backgrounds.clear();
+	m_itemimages.clear();
 	m_fields.clear();
 
 	Strfnd f(m_formspec_string);
@@ -283,6 +284,23 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 				errorstream<<"WARNING: invalid use of image without a size[] element"<<std::endl;
 			m_images.push_back(ImageDrawSpec(name, pos, geom));
 		}
+		else if(type == "item_image")
+		{
+			v2s32 pos = basepos;
+			pos.X += stof(f.next(",")) * (float)spacing.X;
+			pos.Y += stof(f.next(";")) * (float)spacing.Y;
+			v2s32 geom;
+			geom.X = stof(f.next(",")) * (float)imgsize.X;
+			geom.Y = stof(f.next(";")) * (float)imgsize.Y;
+			std::string name = f.next("]");
+			errorstream<<"item name="<<name
+					<<", pos=("<<pos.X<<","<<pos.Y<<")"
+					<<", geom=("<<geom.X<<","<<geom.Y<<")"
+					<<std::endl;
+			if(bp_set != 2)
+				errorstream<<"WARNING: invalid use of item_image without a size[] element"<<std::endl;
+			m_itemimages.push_back(ImageDrawSpec(name, pos, geom));
+		}
 		else if(type == "background")
 		{
 			v2s32 pos = basepos;
@@ -484,6 +502,43 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 			
 			m_fields.push_back(spec);
 		}
+		else if(type == "item_image_button")
+		{
+			v2s32 pos = padding;
+			pos.X += stof(f.next(",")) * (float)spacing.X;
+			pos.Y += stof(f.next(";")) * (float)spacing.Y;
+			v2s32 geom;
+			geom.X = (stof(f.next(",")) * (float)spacing.X)-(spacing.X-imgsize.X);
+			geom.Y = (stof(f.next(";")) * (float)spacing.Y)-(spacing.Y-imgsize.Y);
+			rect = core::rect<s32>(pos.X, pos.Y, pos.X+geom.X, pos.Y+geom.Y);		
+			std::string fimage = f.next(";");
+			std::string fname = f.next(";");
+			std::string flabel = f.next("]");
+			if(bp_set != 2)
+				errorstream<<"WARNING: invalid use of item_image_button without a size[] element"<<std::endl;		
+			IItemDefManager *idef = m_gamedef->idef();
+			ItemStack item;
+			item.deSerialize(fimage, idef);
+			video::ITexture *texture = idef->getInventoryTexture(item.getDefinition(idef).name, m_gamedef);
+			std::string tooltip = item.getDefinition(idef).description;
+			FieldSpec spec = FieldSpec(
+				narrow_to_wide(fname.c_str()),
+				narrow_to_wide(flabel.c_str()),
+				narrow_to_wide(fimage.c_str()),
+				258+m_fields.size()
+			);
+			gui::IGUIButton *e = Environment->addButton(rect, this, spec.fid, spec.flabel.c_str());
+			e->setUseAlphaChannel(true);
+			e->setImage(texture);
+			e->setPressedImage(texture);
+			e->setScaleImage(true);
+			spec.is_button = true;
+			rect+=basepos-padding;
+			spec.rect=rect;		
+			if (tooltip!="")
+				spec.tooltip=tooltip;
+			m_fields.push_back(spec);
+		}
 		else
 		{
 			// Ignore others
@@ -767,15 +822,40 @@ void GUIFormSpecMenu::drawMenu()
 		drawList(m_inventorylists[i], phase);
 	}
 
-	/*
-		Draw dragged item stack
-	*/
-	drawSelectedItem();
-
 	/*
 		Call base class
 	*/
 	gui::IGUIElement::draw();
+	
+	/*
+		Draw fields/buttons tooltips
+	*/
+	for(u32 i=0; i<m_fields.size(); i++)
+	{
+		const FieldSpec &spec = m_fields[i];
+		if (spec.tooltip != "")
+		{
+			core::rect<s32> rect = spec.rect;
+			if (rect.isPointInside(m_pointer)) 
+			{
+				m_tooltip_element->setVisible(true);
+				this->bringToFront(m_tooltip_element);
+				m_tooltip_element->setText(narrow_to_wide(spec.tooltip).c_str());
+				s32 tooltip_x = m_pointer.X + 15;
+				s32 tooltip_y = m_pointer.Y + 15;
+				s32 tooltip_width = m_tooltip_element->getTextWidth() + 15;
+				s32 tooltip_height = m_tooltip_element->getTextHeight() + 5;
+				m_tooltip_element->setRelativePosition(core::rect<s32>(
+				core::position2d<s32>(tooltip_x, tooltip_y),
+				core::dimension2d<s32>(tooltip_width, tooltip_height)));
+			}
+		}
+	}
+	
+	/*
+		Draw dragged item stack
+	*/
+	drawSelectedItem();
 }
 
 void GUIFormSpecMenu::updateSelectedItem()

src/guiFormSpecMenu.h

@@ -133,6 +133,7 @@ class GUIFormSpecMenu : public GUIModalMenu
 			send = false;
 			is_button = false;
 			is_exit = false;
+			tooltip="";
 		}
 		std::wstring fname;
 		std::wstring flabel;
@@ -141,6 +142,8 @@ class GUIFormSpecMenu : public GUIModalMenu
 		bool send;
 		bool is_button;
 		bool is_exit;
+		core::rect<s32> rect;
+		std::string tooltip;
 	};
 
 public:
@@ -209,6 +212,7 @@ protected:
 	core::array<ListDrawSpec> m_inventorylists;
 	core::array<ImageDrawSpec> m_backgrounds;	
 	core::array<ImageDrawSpec> m_images;
+	core::array<ImageDrawSpec> m_itemimages;
 	core::array<FieldSpec> m_fields;
 
 	ItemSpec *m_selected_item;

src/guiMainMenu.cpp

@@ -102,6 +102,8 @@ enum
 	GUI_ID_ANISOTROPIC_CB,
 	GUI_ID_BILINEAR_CB,
 	GUI_ID_TRILINEAR_CB,
+	GUI_ID_SHADERS_CB,
+	GUI_ID_PRELOAD_ITEM_VISUALS_CB,
 	GUI_ID_DAMAGE_CB,
 	GUI_ID_CREATIVE_CB,
 	GUI_ID_JOIN_GAME_BUTTON,
@@ -616,6 +618,21 @@ void GUIMainMenu::regenerateGui(v2u32 screensize)
 				       GUI_ID_TRILINEAR_CB, wgettext("Tri-Linear Filtering"));
 		}
 
+		// shader/on demand image loading settings
+		{
+			core::rect<s32> rect(0, 0, option_w+20, 30);
+			rect += m_topleft_client + v2s32(option_x+175*2, option_y);
+			Environment->addCheckBox(m_data->enable_shaders, rect, this,
+					GUI_ID_SHADERS_CB, wgettext("Shaders"));
+		}
+
+		{
+			core::rect<s32> rect(0, 0, option_w+20+20, 30);
+			rect += m_topleft_client + v2s32(option_x+175*2, option_y+20);
+			Environment->addCheckBox(m_data->preload_item_visuals, rect, this,
+					GUI_ID_PRELOAD_ITEM_VISUALS_CB, wgettext("Preload item visuals"));
+		}
+
 		// Key change button
 		{
 			core::rect<s32> rect(0, 0, 120, 30);
@@ -820,6 +837,18 @@ void GUIMainMenu::readInput(MainMenuData *dst)
 			dst->trilinear_filter = ((gui::IGUICheckBox*)e)->isChecked();
 	}
 
+	{
+		gui::IGUIElement *e = getElementFromId(GUI_ID_SHADERS_CB);
+		if(e != NULL && e->getType() == gui::EGUIET_CHECK_BOX)
+		        dst->enable_shaders = ((gui::IGUICheckBox*)e)->isChecked() ? 2 : 0;
+	}
+
+	{
+		gui::IGUIElement *e = getElementFromId(GUI_ID_PRELOAD_ITEM_VISUALS_CB);
+		if(e != NULL && e->getType() == gui::EGUIET_CHECK_BOX)
+		        dst->preload_item_visuals = ((gui::IGUICheckBox*)e)->isChecked();
+	}
+
 	{
 		gui::IGUIElement *e = getElementFromId(GUI_ID_WORLD_LISTBOX);
 		if(e != NULL && e->getType() == gui::EGUIET_LIST_BOX)

src/guiMainMenu.h

@@ -45,6 +45,8 @@ struct MainMenuData
 	bool anisotropic_filter;
 	bool bilinear_filter;
 	bool trilinear_filter;
+	int enable_shaders;
+	bool preload_item_visuals;
 	// Server options
 	bool creative_mode;
 	bool enable_damage;

src/itemdef.cpp

@@ -31,6 +31,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #endif
 #include "log.h"
 #include "util/serialize.h"
+#include "util/container.h"
+#include "util/thread.h"
 #include <map>
 #include <set>
 
@@ -71,14 +73,6 @@ ItemDefinition& ItemDefinition::operator=(const ItemDefinition &def)
 	}
 	groups = def.groups;
 	node_placement_prediction = def.node_placement_prediction;
-#ifndef SERVER
-	inventory_texture = def.inventory_texture;
-	if(def.wield_mesh)
-	{
-		wield_mesh = def.wield_mesh;
-		wield_mesh->grab();
-	}
-#endif
 	return *this;
 }
 
@@ -91,10 +85,6 @@ void ItemDefinition::resetInitial()
 {
 	// Initialize pointers to NULL so reset() does not delete undefined pointers
 	tool_capabilities = NULL;
-#ifndef SERVER
-	inventory_texture = NULL;
-	wield_mesh = NULL;
-#endif
 	reset();
 }
 
@@ -117,15 +107,6 @@ void ItemDefinition::reset()
 	groups.clear();
 
 	node_placement_prediction = "";
-	
-#ifndef SERVER
-	inventory_texture = NULL;
-	if(wield_mesh)
-	{
-		wield_mesh->drop();
-		wield_mesh = NULL;
-	}
-#endif
 }
 
 void ItemDefinition::serialize(std::ostream &os) const
@@ -203,13 +184,39 @@ void ItemDefinition::deSerialize(std::istream &is)
 
 class CItemDefManager: public IWritableItemDefManager
 {
+#ifndef SERVER
+	struct ClientCached
+	{
+		video::ITexture *inventory_texture;
+		scene::IMesh *wield_mesh;
+
+		ClientCached():
+			inventory_texture(NULL),
+			wield_mesh(NULL)
+		{}
+	};
+#endif
+
 public:
 	CItemDefManager()
 	{
+#ifndef SERVER
+		m_main_thread = get_current_thread_id();
+#endif
+	
 		clear();
 	}
 	virtual ~CItemDefManager()
 	{
+#ifndef SERVER
+		const core::list<ClientCached*> &values = m_clientcached.getValues();
+		for(core::list<ClientCached*>::ConstIterator
+				i = values.begin(); i != values.end(); ++i)
+		{
+			ClientCached *cc = *i;
+			cc->wield_mesh->drop();
+		}
+#endif
 	}
 	virtual const ItemDefinition& get(const std::string &name_) const
 	{
@@ -256,6 +263,220 @@ public:
 		std::map<std::string, ItemDefinition*>::const_iterator i;
 		return m_item_definitions.find(name) != m_item_definitions.end();
 	}
+#ifndef SERVER
+	ClientCached* createClientCachedDirect(const std::string &name,
+			IGameDef *gamedef) const
+	{
+		infostream<<"Lazily creating item texture and mesh for \""
+				<<name<<"\""<<std::endl;
+
+		// This is not thread-safe
+		assert(get_current_thread_id() == m_main_thread);
+
+		// Skip if already in cache
+		ClientCached *cc = NULL;
+		m_clientcached.get(name, &cc);
+		if(cc)
+			return cc;
+
+		ITextureSource *tsrc = gamedef->getTextureSource();
+		INodeDefManager *nodedef = gamedef->getNodeDefManager();
+		IrrlichtDevice *device = tsrc->getDevice();
+		video::IVideoDriver *driver = device->getVideoDriver();
+		const ItemDefinition *def = &get(name);
+
+		// Create new ClientCached
+		cc = new ClientCached();
+
+		bool need_node_mesh = false;
+
+		// Create an inventory texture
+		cc->inventory_texture = NULL;
+		if(def->inventory_image != "")
+		{
+			cc->inventory_texture = tsrc->getTextureRaw(def->inventory_image);
+		}
+		else if(def->type == ITEM_NODE)
+		{
+			need_node_mesh = true;
+		}
+
+		// Create a wield mesh
+		if(cc->wield_mesh != NULL)
+		{
+			cc->wield_mesh->drop();
+			cc->wield_mesh = NULL;
+		}
+		if(def->type == ITEM_NODE && def->wield_image == "")
+		{
+			need_node_mesh = true;
+		}
+		else if(def->wield_image != "" || def->inventory_image != "")
+		{
+			// Extrude the wield image into a mesh
+
+			std::string imagename;
+			if(def->wield_image != "")
+				imagename = def->wield_image;
+			else
+				imagename = def->inventory_image;
+
+			cc->wield_mesh = createExtrudedMesh(
+					tsrc->getTextureRaw(imagename),
+					driver,
+					def->wield_scale * v3f(40.0, 40.0, 4.0));
+			if(cc->wield_mesh == NULL)
+			{
+				infostream<<"ItemDefManager: WARNING: "
+					<<"updateTexturesAndMeshes(): "
+					<<"Unable to create extruded mesh for item "
+					<<def->name<<std::endl;
+			}
+		}
+
+		if(need_node_mesh)
+		{
+			/*
+				Get node properties
+			*/
+			content_t id = nodedef->getId(def->name);
+			const ContentFeatures &f = nodedef->get(id);
+
+			u8 param1 = 0;
+			if(f.param_type == CPT_LIGHT)
+				param1 = 0xee;
+
+			/*
+				Make a mesh from the node
+			*/
+			MeshMakeData mesh_make_data(gamedef);
+			MapNode mesh_make_node(id, param1, 0);
+			mesh_make_data.fillSingleNode(&mesh_make_node);
+			MapBlockMesh mapblock_mesh(&mesh_make_data);
+
+			scene::IMesh *node_mesh = mapblock_mesh.getMesh();
+			assert(node_mesh);
+			setMeshColor(node_mesh, video::SColor(255, 255, 255, 255));
+
+			/*
+				Scale and translate the mesh so it's a unit cube
+				centered on the origin
+			*/
+			scaleMesh(node_mesh, v3f(1.0/BS, 1.0/BS, 1.0/BS));
+			translateMesh(node_mesh, v3f(-1.0, -1.0, -1.0));
+
+			/*
+				Draw node mesh into a render target texture
+			*/
+			if(cc->inventory_texture == NULL)
+			{
+				core::dimension2d<u32> dim(64,64);
+				std::string rtt_texture_name = "INVENTORY_"
+					+ def->name + "_RTT";
+				v3f camera_position(0, 1.0, -1.5);
+				camera_position.rotateXZBy(45);
+				v3f camera_lookat(0, 0, 0);
+				core::CMatrix4<f32> camera_projection_matrix;
+				// Set orthogonal projection
+				camera_projection_matrix.buildProjectionMatrixOrthoLH(
+						1.65, 1.65, 0, 100);
+
+				video::SColorf ambient_light(0.2,0.2,0.2);
+				v3f light_position(10, 100, -50);
+				video::SColorf light_color(0.5,0.5,0.5);
+				f32 light_radius = 1000;
+
+				cc->inventory_texture = generateTextureFromMesh(
+					node_mesh, device, dim, rtt_texture_name,
+					camera_position,
+					camera_lookat,
+					camera_projection_matrix,
+					ambient_light,
+					light_position,
+					light_color,
+					light_radius);
+
+				// render-to-target didn't work
+				if(cc->inventory_texture == NULL)
+				{
+					cc->inventory_texture =
+						tsrc->getTextureRaw(f.tiledef[0].name);
+				}
+			}
+
+			/*
+				Use the node mesh as the wield mesh
+			*/
+			if(cc->wield_mesh == NULL)
+			{
+				// Scale to proper wield mesh proportions
+				scaleMesh(node_mesh, v3f(30.0, 30.0, 30.0)
+						* def->wield_scale);
+				cc->wield_mesh = node_mesh;
+				cc->wield_mesh->grab();
+			}
+
+			// falling outside of here deletes node_mesh
+		}
+
+		// Put in cache
+		m_clientcached.set(name, cc);
+
+		return cc;
+	}
+	ClientCached* getClientCached(const std::string &name,
+			IGameDef *gamedef) const
+	{
+		ClientCached *cc = NULL;
+		m_clientcached.get(name, &cc);
+		if(cc)
+			return cc;
+
+		if(get_current_thread_id() == m_main_thread)
+		{
+			return createClientCachedDirect(name, gamedef);
+		}
+		else
+		{
+			// We're gonna ask the result to be put into here
+			ResultQueue<std::string, ClientCached*, u8, u8> result_queue;
+			// Throw a request in
+			m_get_clientcached_queue.add(name, 0, 0, &result_queue);
+			try{
+				// Wait result for a second
+				GetResult<std::string, ClientCached*, u8, u8>
+						result = result_queue.pop_front(1000);
+				// Check that at least something worked OK
+				assert(result.key == name);
+				// Return it
+				return result.item;
+			}
+			catch(ItemNotFoundException &e)
+			{
+				errorstream<<"Waiting for clientcached timed out."<<std::endl;
+				return &m_dummy_clientcached;
+			}
+		}
+	}
+	// Get item inventory texture
+	virtual video::ITexture* getInventoryTexture(const std::string &name,
+			IGameDef *gamedef) const
+	{
+		ClientCached *cc = getClientCached(name, gamedef);
+		if(!cc)
+			return NULL;
+		return cc->inventory_texture;
+	}
+	// Get item wield mesh
+	virtual scene::IMesh* getWieldMesh(const std::string &name,
+			IGameDef *gamedef) const
+	{
+		ClientCached *cc = getClientCached(name, gamedef);
+		if(!cc)
+			return NULL;
+		return cc->wield_mesh;
+	}
+#endif
 	void clear()
 	{
 		for(std::map<std::string, ItemDefinition*>::const_iterator
@@ -321,157 +542,6 @@ public:
 			m_aliases[name] = convert_to;
 		}
 	}
-
-	virtual void updateTexturesAndMeshes(IGameDef *gamedef)
-	{
-#ifndef SERVER
-		infostream<<"ItemDefManager::updateTexturesAndMeshes(): Updating "
-				<<"textures and meshes in item definitions"<<std::endl;
-
-		ITextureSource *tsrc = gamedef->getTextureSource();
-		INodeDefManager *nodedef = gamedef->getNodeDefManager();
-		IrrlichtDevice *device = tsrc->getDevice();
-		video::IVideoDriver *driver = device->getVideoDriver();
-
-		for(std::map<std::string, ItemDefinition*>::iterator
-				i = m_item_definitions.begin();
-				i != m_item_definitions.end(); i++)
-		{
-			ItemDefinition *def = i->second;
-
-			bool need_node_mesh = false;
-
-			// Create an inventory texture
-			def->inventory_texture = NULL;
-			if(def->inventory_image != "")
-			{
-				def->inventory_texture = tsrc->getTextureRaw(def->inventory_image);
-			}
-			else if(def->type == ITEM_NODE)
-			{
-				need_node_mesh = true;
-			}
-
-			// Create a wield mesh
-			if(def->wield_mesh != NULL)
-			{
-				def->wield_mesh->drop();
-				def->wield_mesh = NULL;
-			}
-			if(def->type == ITEM_NODE && def->wield_image == "")
-			{
-				need_node_mesh = true;
-			}
-			else if(def->wield_image != "" || def->inventory_image != "")
-			{
-				// Extrude the wield image into a mesh
-
-				std::string imagename;
-				if(def->wield_image != "")
-					imagename = def->wield_image;
-				else
-					imagename = def->inventory_image;
-
-				def->wield_mesh = createExtrudedMesh(
-						tsrc->getTextureRaw(imagename),
-						driver,
-						def->wield_scale * v3f(40.0, 40.0, 4.0));
-				if(def->wield_mesh == NULL)
-				{
-					infostream<<"ItemDefManager: WARNING: "
-						<<"updateTexturesAndMeshes(): "
-						<<"Unable to create extruded mesh for item "
-						<<def->name<<std::endl;
-				}
-			}
-
-			if(need_node_mesh)
-			{
-				/*
-					Get node properties
-				*/
-				content_t id = nodedef->getId(def->name);
-				const ContentFeatures &f = nodedef->get(id);
-
-				u8 param1 = 0;
-				if(f.param_type == CPT_LIGHT)
-					param1 = 0xee;
-
-				/*
-				 	Make a mesh from the node
-				*/
-				MeshMakeData mesh_make_data(gamedef);
-				MapNode mesh_make_node(id, param1, 0);
-				mesh_make_data.fillSingleNode(&mesh_make_node);
-				MapBlockMesh mapblock_mesh(&mesh_make_data);
-
-				scene::IMesh *node_mesh = mapblock_mesh.getMesh();
-				assert(node_mesh);
-				setMeshColor(node_mesh, video::SColor(255, 255, 255, 255));
-
-				/*
-					Scale and translate the mesh so it's a unit cube
-					centered on the origin
-				*/
-				scaleMesh(node_mesh, v3f(1.0/BS, 1.0/BS, 1.0/BS));
-				translateMesh(node_mesh, v3f(-1.0, -1.0, -1.0));
-
-				/*
-					Draw node mesh into a render target texture
-				*/
-				if(def->inventory_texture == NULL)
-				{
-					core::dimension2d<u32> dim(64,64);
-					std::string rtt_texture_name = "INVENTORY_"
-						+ def->name + "_RTT";
-					v3f camera_position(0, 1.0, -1.5);
-					camera_position.rotateXZBy(45);
-					v3f camera_lookat(0, 0, 0);
-					core::CMatrix4<f32> camera_projection_matrix;
-					// Set orthogonal projection
-					camera_projection_matrix.buildProjectionMatrixOrthoLH(
-							1.65, 1.65, 0, 100);
-
-					video::SColorf ambient_light(0.2,0.2,0.2);
-					v3f light_position(10, 100, -50);
-					video::SColorf light_color(0.5,0.5,0.5);
-					f32 light_radius = 1000;
-
-					def->inventory_texture = generateTextureFromMesh(
-						node_mesh, device, dim, rtt_texture_name,
-						camera_position,
-						camera_lookat,
-						camera_projection_matrix,
-						ambient_light,
-						light_position,
-						light_color,
-						light_radius);
-
-					// render-to-target didn't work
-					if(def->inventory_texture == NULL)
-					{
-						def->inventory_texture =
-							tsrc->getTextureRaw(f.tiledef[0].name);
-					}
-				}
-
-				/*
-					Use the node mesh as the wield mesh
-				*/
-				if(def->wield_mesh == NULL)
-				{
-					// Scale to proper wield mesh proportions
-					scaleMesh(node_mesh, v3f(30.0, 30.0, 30.0)
-							* def->wield_scale);
-					def->wield_mesh = node_mesh;
-					def->wield_mesh->grab();
-				}
-
-				// falling outside of here deletes node_mesh
-			}
-		}
-#endif
-	}
 	void serialize(std::ostream &os)
 	{
 		writeU8(os, 0); // version
@@ -521,11 +591,37 @@ public:
 			registerAlias(name, convert_to);
 		}
 	}
+	void processQueue(IGameDef *gamedef)
+	{
+#ifndef SERVER
+		while(m_get_clientcached_queue.size() > 0)
+		{
+			GetRequest<std::string, ClientCached*, u8, u8>
+					request = m_get_clientcached_queue.pop();
+			GetResult<std::string, ClientCached*, u8, u8>
+					result;
+			result.key = request.key;
+			result.callers = request.callers;
+			result.item = createClientCachedDirect(request.key, gamedef);
+			request.dest->push_back(result);
+		}
+#endif
+	}
 private:
 	// Key is name
 	std::map<std::string, ItemDefinition*> m_item_definitions;
 	// Aliases
 	std::map<std::string, std::string> m_aliases;
+#ifndef SERVER
+	// The id of the thread that is allowed to use irrlicht directly
+	threadid_t m_main_thread;
+	// A reference to this can be returned when nothing is found, to avoid NULLs
+	mutable ClientCached m_dummy_clientcached;
+	// Cached textures and meshes
+	mutable MutexedMap<std::string, ClientCached*> m_clientcached;
+	// Queued clientcached fetches (to be processed by the main thread)
+	mutable RequestQueue<std::string, ClientCached*, u8, u8> m_get_clientcached_queue;
+#endif
 };
 
 IWritableItemDefManager* createItemDefManager()

src/itemdef.h

@@ -72,14 +72,6 @@ struct ItemDefinition
 	// "" = no prediction
 	std::string node_placement_prediction;
 
-	/*
-		Cached stuff
-	*/
-#ifndef SERVER
-	video::ITexture *inventory_texture;
-	scene::IMesh *wield_mesh;
-#endif
-
 	/*
 		Some helpful methods
 	*/
@@ -108,6 +100,14 @@ public:
 	virtual std::set<std::string> getAll() const=0;
 	// Check if item is known
 	virtual bool isKnown(const std::string &name) const=0;
+#ifndef SERVER
+	// Get item inventory texture
+	virtual video::ITexture* getInventoryTexture(const std::string &name,
+			IGameDef *gamedef) const=0;
+	// Get item wield mesh
+	virtual scene::IMesh* getWieldMesh(const std::string &name,
+		IGameDef *gamedef) const=0;
+#endif
 
 	virtual void serialize(std::ostream &os)=0;
 };
@@ -126,6 +126,14 @@ public:
 	virtual std::set<std::string> getAll() const=0;
 	// Check if item is known
 	virtual bool isKnown(const std::string &name) const=0;
+#ifndef SERVER
+	// Get item inventory texture
+	virtual video::ITexture* getInventoryTexture(const std::string &name,
+			IGameDef *gamedef) const=0;
+	// Get item wield mesh
+	virtual scene::IMesh* getWieldMesh(const std::string &name,
+		IGameDef *gamedef) const=0;
+#endif
 
 	// Remove all registered item and node definitions and aliases
 	// Then re-add the builtin item definitions
@@ -138,15 +146,11 @@ public:
 	virtual void registerAlias(const std::string &name,
 			const std::string &convert_to)=0;
 
-	/*
-		Update inventory textures and wield meshes to latest
-		return values of ITextureSource and INodeDefManager.
-		Call after updating the texture atlas of a texture source.
-	*/
-	virtual void updateTexturesAndMeshes(IGameDef *gamedef)=0;
-
 	virtual void serialize(std::ostream &os)=0;
 	virtual void deSerialize(std::istream &is)=0;
+
+	// Do stuff asked by threads that can only be done in the main thread
+	virtual void processQueue(IGameDef *gamedef)=0;
 };
 
 IWritableItemDefManager* createItemDefManager();

src/main.cpp

@@ -1440,6 +1440,8 @@ int main(int argc, char *argv[])
 				menudata.anisotropic_filter = g_settings->getBool("anisotropic_filter");
 				menudata.bilinear_filter = g_settings->getBool("bilinear_filter");
 				menudata.trilinear_filter = g_settings->getBool("trilinear_filter");
+				menudata.enable_shaders = g_settings->getS32("enable_shaders");
+				menudata.preload_item_visuals = g_settings->getBool("preload_item_visuals");
 				driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, menudata.mip_map);
 				menudata.creative_mode = g_settings->getBool("creative_mode");
 				menudata.enable_damage = g_settings->getBool("enable_damage");
@@ -1560,6 +1562,9 @@ int main(int argc, char *argv[])
 				g_settings->set("bilinear_filter", itos(menudata.bilinear_filter));
 				g_settings->set("trilinear_filter", itos(menudata.trilinear_filter));
 
+				g_settings->setS32("enable_shaders", menudata.enable_shaders);
+				g_settings->set("preload_item_visuals", itos(menudata.preload_item_visuals));
+
 				g_settings->set("creative_mode", itos(menudata.creative_mode));
 				g_settings->set("enable_damage", itos(menudata.enable_damage));
 				g_settings->set("name", playername);

src/mapblock_mesh.cpp

@@ -28,6 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mesh.h"
 #include "content_mapblock.h"
 #include "noise.h"
+#include "shader.h"
 #include "settings.h"
 #include "util/directiontables.h"
 
@@ -1011,6 +1012,11 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data):
 		Convert MeshCollector to SMesh
 		Also store animation info
 	*/
+	bool enable_shaders = (g_settings->getS32("enable_shaders") > 0);
+	video::E_MATERIAL_TYPE shadermat1 = m_gamedef->getShaderSource()->
+			getShader("test_shader_1").material;
+	video::E_MATERIAL_TYPE shadermat2 = m_gamedef->getShaderSource()->
+			getShader("test_shader_2").material;
 	for(u32 i = 0; i < collector.prebuffers.size(); i++)
 	{
 		PreMeshBuffer &p = collector.prebuffers[i];
@@ -1075,7 +1081,10 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data):
 		material.MaterialType
 				= video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 		material.setTexture(0, p.tile.texture.atlas);
-		p.tile.applyMaterialOptions(material);
+		if(enable_shaders)
+			p.tile.applyMaterialOptionsWithShaders(material, shadermat1, shadermat2);
+		else
+			p.tile.applyMaterialOptions(material);
 
 		// Create meshbuffer
 

src/nodedef.cpp

@@ -555,6 +555,7 @@ public:
 					tiledef[j].name = "unknown_block.png";
 			}
 
+			bool is_liquid = false;
 			switch(f->drawtype){
 			default:
 			case NDT_NORMAL:
@@ -573,12 +574,14 @@ public:
 					f->solidness = 1;
 					f->backface_culling = false;
 				}
+				is_liquid = true;
 				break;
 			case NDT_FLOWINGLIQUID:
 				assert(f->liquid_type == LIQUID_FLOWING);
 				f->solidness = 0;
 				if(opaque_water)
 					f->alpha = 255;
+				is_liquid = true;
 				break;
 			case NDT_GLASSLIKE:
 				f->solidness = 0;
@@ -611,16 +614,24 @@ public:
 				break;
 			}
 
+			u8 material_type = 0;
+			if(is_liquid){
+				if(f->alpha == 255)
+					material_type = TILE_MATERIAL_LIQUID_OPAQUE;
+				else
+					material_type = TILE_MATERIAL_LIQUID_TRANSPARENT;
+			} else{
+				material_type = TILE_MATERIAL_BASIC;
+			}
+
 			// Tiles (fill in f->tiles[])
 			for(u16 j=0; j<6; j++){
 				// Texture
 				f->tiles[j].texture = tsrc->getTexture(tiledef[j].name);
 				// Alpha
 				f->tiles[j].alpha = f->alpha;
-				if(f->alpha == 255)
-					f->tiles[j].material_type = MATERIAL_ALPHA_SIMPLE;
-				else
-					f->tiles[j].material_type = MATERIAL_ALPHA_VERTEX;
+				// Material type
+				f->tiles[j].material_type = material_type;
 				// Material flags
 				f->tiles[j].material_flags = 0;
 				if(f->backface_culling)
@@ -661,10 +672,8 @@ public:
 						tsrc->getTexture(f->tiledef_special[j].name);
 				// Alpha
 				f->special_tiles[j].alpha = f->alpha;
-				if(f->alpha == 255)
-					f->special_tiles[j].material_type = MATERIAL_ALPHA_SIMPLE;
-				else
-					f->special_tiles[j].material_type = MATERIAL_ALPHA_VERTEX;
+				// Material type
+				f->special_tiles[j].material_type = material_type;
 				// Material flags
 				f->special_tiles[j].material_flags = 0;
 				if(f->tiledef_special[j].backface_culling)

src/server.cpp

@@ -4688,6 +4688,10 @@ ITextureSource* Server::getTextureSource()
 {
 	return NULL;
 }
+IShaderSource* Server::getShaderSource()
+{
+	return NULL;
+}
 u16 Server::allocateUnknownNodeId(const std::string &name)
 {
 	return m_nodedef->allocateDummy(name);

src/server.h

@@ -560,6 +560,7 @@ public:
 	virtual INodeDefManager* getNodeDefManager();
 	virtual ICraftDefManager* getCraftDefManager();
 	virtual ITextureSource* getTextureSource();
+	virtual IShaderSource* getShaderSource();
 	virtual u16 allocateUnknownNodeId(const std::string &name);
 	virtual ISoundManager* getSoundManager();
 	virtual MtEventManager* getEventManager();

src/shader.cpp

@@ -0,0 +1,793 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2012 Kahrl <kahrl@gmx.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU 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.
+*/
+
+#include "shader.h"
+#include "irrlichttypes_extrabloated.h"
+#include "debug.h"
+#include "main.h" // for g_settings
+#include "filesys.h"
+#include "util/container.h"
+#include "util/thread.h"
+#include "settings.h"
+#include <iterator>
+#include <ICameraSceneNode.h>
+#include <IGPUProgrammingServices.h>
+#include <IMaterialRenderer.h>
+#include <IMaterialRendererServices.h>
+#include <IShaderConstantSetCallBack.h>
+#include "EShaderTypes.h"
+#include "log.h"
+#include "gamedef.h"
+#include "strfnd.h" // trim()
+
+/*
+	A cache from shader name to shader path
+*/
+MutexedMap<std::string, std::string> g_shadername_to_path_cache;
+
+/*
+	Gets the path to a shader by first checking if the file
+	  name_of_shader/filename
+	exists in shader_path and if not, using the data path.
+
+	If not found, returns "".
+
+	Utilizes a thread-safe cache.
+*/
+std::string getShaderPath(const std::string &name_of_shader,
+		const std::string &filename)
+{
+	std::string combined = name_of_shader + DIR_DELIM + filename;
+	std::string fullpath = "";
+	/*
+		Check from cache
+	*/
+	bool incache = g_shadername_to_path_cache.get(combined, &fullpath);
+	if(incache)
+		return fullpath;
+
+	/*
+		Check from shader_path
+	*/
+	std::string shader_path = g_settings->get("shader_path");
+	if(shader_path != "")
+	{
+		std::string testpath = shader_path + DIR_DELIM + combined;
+		if(fs::PathExists(testpath))
+			fullpath = testpath;
+	}
+
+	/*
+		Check from default data directory
+	*/
+	if(fullpath == "")
+	{
+		std::string rel_path = std::string("client") + DIR_DELIM
+				+ "shaders" + DIR_DELIM
+				+ name_of_shader + DIR_DELIM
+				+ filename;
+		std::string testpath = porting::path_share + DIR_DELIM + rel_path;
+		if(fs::PathExists(testpath))
+			fullpath = testpath;
+	}
+
+	// Add to cache (also an empty result is cached)
+	g_shadername_to_path_cache.set(combined, fullpath);
+
+	// Finally return it
+	return fullpath;
+}
+
+/*
+	SourceShaderCache: A cache used for storing source shaders.
+*/
+
+class SourceShaderCache
+{
+public:
+	void insert(const std::string &name_of_shader,
+			const std::string &filename,
+			const std::string &program,
+			bool prefer_local)
+	{
+		std::string combined = name_of_shader + DIR_DELIM + filename;
+		// Try to use local shader instead if asked to
+		if(prefer_local){
+			std::string path = getShaderPath(name_of_shader, filename);
+			if(path != ""){
+				std::string p = readFile(path);
+				if(p != ""){
+					m_programs[combined] = p;
+					return;
+				}
+			}
+		}
+		m_programs[combined] = program;
+	}
+	std::string get(const std::string &name_of_shader,
+			const std::string &filename)
+	{
+		std::string combined = name_of_shader + DIR_DELIM + filename;
+		core::map<std::string, std::string>::Node *n;
+		n = m_programs.find(combined);
+		if(n)
+			return n->getValue();
+		return "";
+	}
+	// Primarily fetches from cache, secondarily tries to read from filesystem
+	std::string getOrLoad(const std::string &name_of_shader,
+			const std::string &filename)
+	{
+		std::string combined = name_of_shader + DIR_DELIM + filename;
+		core::map<std::string, std::string>::Node *n;
+		n = m_programs.find(combined);
+		if(n)
+			return n->getValue();
+		std::string path = getShaderPath(name_of_shader, filename);
+		if(path == ""){
+			infostream<<"SourceShaderCache::getOrLoad(): No path found for \""
+					<<combined<<"\""<<std::endl;
+			return "";
+		}
+		infostream<<"SourceShaderCache::getOrLoad(): Loading path \""<<path
+				<<"\""<<std::endl;
+		std::string p = readFile(path);
+		if(p != ""){
+			m_programs[combined] = p;
+			return p;
+		}
+		return "";
+	}
+private:
+	core::map<std::string, std::string> m_programs;
+	std::string readFile(const std::string &path)
+	{
+		std::ifstream is(path.c_str(), std::ios::binary);
+		if(!is.is_open())
+			return "";
+		std::ostringstream tmp_os;
+		tmp_os << is.rdbuf();
+		return tmp_os.str();
+	}
+};
+
+/*
+	ShaderCallback: Sets constants that can be used in shaders
+*/
+
+class IShaderConstantSetterRegistry
+{
+public:
+	virtual ~IShaderConstantSetterRegistry(){};
+	virtual void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel, const std::string &name) = 0;
+};
+
+class ShaderCallback : public video::IShaderConstantSetCallBack
+{
+	IShaderConstantSetterRegistry *m_scsr;
+	std::string m_name;
+
+public:
+	ShaderCallback(IShaderConstantSetterRegistry *scsr, const std::string &name):
+		m_scsr(scsr),
+		m_name(name)
+	{}
+	~ShaderCallback() {}
+
+	virtual void OnSetConstants(video::IMaterialRendererServices *services, s32 userData)
+	{
+		video::IVideoDriver *driver = services->getVideoDriver();
+		assert(driver);
+
+		bool is_highlevel = userData;
+
+		m_scsr->onSetConstants(services, is_highlevel, m_name);
+	}
+};
+
+/*
+	MainShaderConstantSetter: Set basic constants required for almost everything
+*/
+
+class MainShaderConstantSetter : public IShaderConstantSetter
+{
+public:
+	MainShaderConstantSetter(IrrlichtDevice *device):
+		m_device(device)
+	{}
+	~MainShaderConstantSetter() {}
+
+	virtual void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel)
+	{
+		video::IVideoDriver *driver = services->getVideoDriver();
+		assert(driver);
+
+		// set inverted world matrix
+		core::matrix4 invWorld = driver->getTransform(video::ETS_WORLD);
+		invWorld.makeInverse();
+		if(is_highlevel)
+			services->setVertexShaderConstant("mInvWorld", invWorld.pointer(), 16);
+		else
+			services->setVertexShaderConstant(invWorld.pointer(), 0, 4);
+
+		// set clip matrix
+		core::matrix4 worldViewProj;
+		worldViewProj = driver->getTransform(video::ETS_PROJECTION);
+		worldViewProj *= driver->getTransform(video::ETS_VIEW);
+		worldViewProj *= driver->getTransform(video::ETS_WORLD);
+		if(is_highlevel)
+			services->setVertexShaderConstant("mWorldViewProj", worldViewProj.pointer(), 16);
+		else
+			services->setVertexShaderConstant(worldViewProj.pointer(), 4, 4);
+
+		// set transposed world matrix
+		core::matrix4 world = driver->getTransform(video::ETS_WORLD);
+		world = world.getTransposed();
+		if(is_highlevel)
+			services->setVertexShaderConstant("mTransWorld", world.pointer(), 16);
+		else
+			services->setVertexShaderConstant(world.pointer(), 8, 4);
+	}
+
+private:
+	IrrlichtDevice *m_device;
+};
+
+/*
+	ShaderSource
+*/
+
+class ShaderSource : public IWritableShaderSource, public IShaderConstantSetterRegistry
+{
+public:
+	ShaderSource(IrrlichtDevice *device);
+	~ShaderSource();
+
+	/*
+		Gets a shader material id from cache or
+		- if main thread, from getShaderIdDirect
+		- if other thread, adds to request queue and waits for main thread
+	*/
+	u32 getShaderId(const std::string &name);
+
+	/*
+		- If shader material specified by name is found from cache,
+		  return the cached id.
+		- Otherwise generate the shader material, add to cache and return id.
+
+		The id 0 points to a null shader. Its material is EMT_SOLID.
+	*/
+	u32 getShaderIdDirect(const std::string &name);
+
+	// Finds out the name of a cached shader.
+	std::string getShaderName(u32 id);
+
+	/*
+		If shader specified by the name pointed by the id doesn't
+		exist, create it, then return the cached shader.
+
+		Can be called from any thread. If called from some other thread
+		and not found in cache, the call is queued to the main thread
+		for processing.
+	*/
+	ShaderInfo getShader(u32 id);
+
+	ShaderInfo getShader(const std::string &name)
+	{
+		return getShader(getShaderId(name));
+	}
+
+	// Processes queued shader requests from other threads.
+	// Shall be called from the main thread.
+	void processQueue();
+
+	// Insert a shader program into the cache without touching the
+	// filesystem. Shall be called from the main thread.
+	void insertSourceShader(const std::string &name_of_shader,
+		const std::string &filename, const std::string &program);
+
+	// Rebuild shaders from the current set of source shaders
+	// Shall be called from the main thread.
+	void rebuildShaders();
+
+	void addGlobalConstantSetter(IShaderConstantSetter *setter)
+	{
+		m_global_setters.push_back(setter);
+	}
+
+	void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel, const std::string &name);
+
+private:
+
+	// The id of the thread that is allowed to use irrlicht directly
+	threadid_t m_main_thread;
+	// The irrlicht device
+	IrrlichtDevice *m_device;
+	// The set-constants callback
+	ShaderCallback *m_shader_callback;
+
+	// Cache of source shaders
+	// This should be only accessed from the main thread
+	SourceShaderCache m_sourcecache;
+
+	// A shader id is index in this array.
+	// The first position contains a dummy shader.
+	core::array<ShaderInfo> m_shaderinfo_cache;
+	// Maps a shader name to an index in the former.
+	core::map<std::string, u32> m_name_to_id;
+	// The two former containers are behind this mutex
+	JMutex m_shaderinfo_cache_mutex;
+
+	// Queued shader fetches (to be processed by the main thread)
+	RequestQueue<std::string, u32, u8, u8> m_get_shader_queue;
+
+	// Global constant setters
+	// TODO: Delete these in the destructor
+	core::array<IShaderConstantSetter*> m_global_setters;
+};
+
+IWritableShaderSource* createShaderSource(IrrlichtDevice *device)
+{
+	return new ShaderSource(device);
+}
+
+/*
+	Generate shader given the shader name.
+*/
+ShaderInfo generate_shader(std::string name, IrrlichtDevice *device,
+		video::IShaderConstantSetCallBack *callback,
+		SourceShaderCache *sourcecache);
+
+/*
+	Load shader programs
+*/
+void load_shaders(std::string name, SourceShaderCache *sourcecache,
+		video::E_DRIVER_TYPE drivertype, s32 enable_shaders,
+		std::string &vertex_program, std::string &pixel_program,
+		std::string &geometry_program, bool &is_highlevel);
+
+ShaderSource::ShaderSource(IrrlichtDevice *device):
+		m_device(device)
+{
+	assert(m_device);
+
+	m_shader_callback = new ShaderCallback(this, "default");
+
+	m_shaderinfo_cache_mutex.Init();
+
+	m_main_thread = get_current_thread_id();
+
+	// Add a dummy ShaderInfo as the first index, named ""
+	m_shaderinfo_cache.push_back(ShaderInfo());
+	m_name_to_id[""] = 0;
+
+	// Add main global constant setter
+	addGlobalConstantSetter(new MainShaderConstantSetter(device));
+}
+
+ShaderSource::~ShaderSource()
+{
+	//m_shader_callback->drop();
+}
+
+u32 ShaderSource::getShaderId(const std::string &name)
+{
+	//infostream<<"getShaderId(): \""<<name<<"\""<<std::endl;
+
+	{
+		/*
+			See if shader already exists
+		*/
+		JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+		core::map<std::string, u32>::Node *n;
+		n = m_name_to_id.find(name);
+		if(n != NULL)
+			return n->getValue();
+	}
+
+	/*
+		Get shader
+	*/
+	if(get_current_thread_id() == m_main_thread){
+		return getShaderIdDirect(name);
+	} else {
+		infostream<<"getShaderId(): Queued: name=\""<<name<<"\""<<std::endl;
+
+		// We're gonna ask the result to be put into here
+		ResultQueue<std::string, u32, u8, u8> result_queue;
+
+		// Throw a request in
+		m_get_shader_queue.add(name, 0, 0, &result_queue);
+
+		infostream<<"Waiting for shader from main thread, name=\""
+				<<name<<"\""<<std::endl;
+
+		try{
+			// Wait result for a second
+			GetResult<std::string, u32, u8, u8>
+					result = result_queue.pop_front(1000);
+
+			// Check that at least something worked OK
+			assert(result.key == name);
+
+			return result.item;
+		}
+		catch(ItemNotFoundException &e){
+			infostream<<"Waiting for shader timed out."<<std::endl;
+			return 0;
+		}
+	}
+
+	infostream<<"getShaderId(): Failed"<<std::endl;
+
+	return 0;
+}
+
+/*
+	This method generates all the shaders
+*/
+u32 ShaderSource::getShaderIdDirect(const std::string &name)
+{
+	//infostream<<"getShaderIdDirect(): name=\""<<name<<"\""<<std::endl;
+
+	// Empty name means shader 0
+	if(name == ""){
+		infostream<<"getShaderIdDirect(): name is empty"<<std::endl;
+		return 0;
+	}
+
+	/*
+		Calling only allowed from main thread
+	*/
+	if(get_current_thread_id() != m_main_thread){
+		errorstream<<"ShaderSource::getShaderIdDirect() "
+				"called not from main thread"<<std::endl;
+		return 0;
+	}
+
+	/*
+		See if shader already exists
+	*/
+	{
+		JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+
+		core::map<std::string, u32>::Node *n;
+		n = m_name_to_id.find(name);
+		if(n != NULL){
+			/*infostream<<"getShaderIdDirect(): \""<<name
+					<<"\" found in cache"<<std::endl;*/
+			return n->getValue();
+		}
+	}
+
+	/*infostream<<"getShaderIdDirect(): \""<<name
+			<<"\" NOT found in cache. Creating it."<<std::endl;*/
+
+	ShaderInfo info = generate_shader(name, m_device,
+			m_shader_callback, &m_sourcecache);
+
+	/*
+		Add shader to caches (add dummy shaders too)
+	*/
+
+	JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+
+	u32 id = m_shaderinfo_cache.size();
+	m_shaderinfo_cache.push_back(info);
+	m_name_to_id.insert(name, id);
+
+	/*infostream<<"getShaderIdDirect(): "
+			<<"Returning id="<<id<<" for name \""<<name<<"\""<<std::endl;*/
+
+	return id;
+}
+
+std::string ShaderSource::getShaderName(u32 id)
+{
+	JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+
+	if(id >= m_shaderinfo_cache.size()){
+		errorstream<<"ShaderSource::getShaderName(): id="<<id
+				<<" >= m_shaderinfo_cache.size()="
+				<<m_shaderinfo_cache.size()<<std::endl;
+		return "";
+	}
+
+	return m_shaderinfo_cache[id].name;
+}
+
+ShaderInfo ShaderSource::getShader(u32 id)
+{
+	JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+
+	if(id >= m_shaderinfo_cache.size())
+		return ShaderInfo();
+
+	return m_shaderinfo_cache[id];
+}
+
+void ShaderSource::processQueue()
+{
+	/*
+		Fetch shaders
+	*/
+	if(m_get_shader_queue.size() > 0){
+		GetRequest<std::string, u32, u8, u8>
+				request = m_get_shader_queue.pop();
+
+		/*infostream<<"ShaderSource::processQueue(): "
+				<<"got shader request with "
+				<<"name=\""<<request.key<<"\""
+				<<std::endl;*/
+
+		GetResult<std::string, u32, u8, u8>
+				result;
+		result.key = request.key;
+		result.callers = request.callers;
+		result.item = getShaderIdDirect(request.key);
+
+		request.dest->push_back(result);
+	}
+}
+
+void ShaderSource::insertSourceShader(const std::string &name_of_shader,
+		const std::string &filename, const std::string &program)
+{
+	/*infostream<<"ShaderSource::insertSourceShader(): "
+			"name_of_shader=\""<<name_of_shader<<"\", "
+			"filename=\""<<filename<<"\""<<std::endl;*/
+
+	assert(get_current_thread_id() == m_main_thread);
+
+	m_sourcecache.insert(name_of_shader, filename, program, true);
+}
+
+void ShaderSource::rebuildShaders()
+{
+	JMutexAutoLock lock(m_shaderinfo_cache_mutex);
+
+	/*// Oh well... just clear everything, they'll load sometime.
+	m_shaderinfo_cache.clear();
+	m_name_to_id.clear();*/
+
+	/*
+		FIXME: Old shader materials can't be deleted in Irrlicht,
+		or can they?
+		(This would be nice to do in the destructor too)
+	*/
+
+	// Recreate shaders
+	for(u32 i=0; i<m_shaderinfo_cache.size(); i++){
+		ShaderInfo *info = &m_shaderinfo_cache[i];
+		*info = generate_shader(info->name, m_device,
+				m_shader_callback, &m_sourcecache);
+	}
+}
+
+void ShaderSource::onSetConstants(video::IMaterialRendererServices *services,
+		bool is_highlevel, const std::string &name)
+{
+	for(u32 i=0; i<m_global_setters.size(); i++){
+		IShaderConstantSetter *setter = m_global_setters[i];
+		setter->onSetConstants(services, is_highlevel);
+	}
+}
+ 
+ShaderInfo generate_shader(std::string name, IrrlichtDevice *device,
+		video::IShaderConstantSetCallBack *callback,
+		SourceShaderCache *sourcecache)
+{
+	/*infostream<<"generate_shader(): "
+			"\""<<name<<"\""<<std::endl;*/
+
+	ShaderInfo shaderinfo;
+	shaderinfo.name = name;
+	shaderinfo.material = video::EMT_SOLID;
+
+	/*
+		Get the base material
+	*/
+	std::string base_material_name =
+		trim(sourcecache->getOrLoad(name, "base.txt"));
+	for(s32 i = 0; video::sBuiltInMaterialTypeNames[i] != 0; i++){
+		if(video::sBuiltInMaterialTypeNames[i] == base_material_name){
+			shaderinfo.material = (video::E_MATERIAL_TYPE) i;
+			break;
+		}
+	}
+
+	// 0 = off, 1 = assembly shaders only, 2 = highlevel or assembly
+	s32 enable_shaders = g_settings->getS32("enable_shaders");
+	if(enable_shaders <= 0)
+		return shaderinfo;
+
+	video::IVideoDriver* driver = device->getVideoDriver();
+	assert(driver);
+
+	video::IGPUProgrammingServices *gpu = driver->getGPUProgrammingServices();
+	if(!gpu){
+		errorstream<<"generate_shader(): "
+				"failed to generate \""<<name<<"\", "
+				"GPU programming not supported."
+				<<std::endl;
+		return shaderinfo;
+	}
+
+	// Choose shader language depending on driver type and settings
+	// Then load shaders
+	std::string vertex_program;
+	std::string pixel_program;
+	std::string geometry_program;
+	bool is_highlevel;
+	load_shaders(name, sourcecache, driver->getDriverType(),
+			enable_shaders, vertex_program, pixel_program,
+			geometry_program, is_highlevel);
+
+	// Check hardware/driver support
+	if(vertex_program != "" &&
+			!driver->queryFeature(video::EVDF_VERTEX_SHADER_1_1) &&
+			!driver->queryFeature(video::EVDF_ARB_VERTEX_PROGRAM_1)){
+		infostream<<"generate_shader(): vertex shaders disabled "
+				"because of missing driver/hardware support."
+				<<std::endl;
+		vertex_program = "";
+	}
+	if(pixel_program != "" &&
+			!driver->queryFeature(video::EVDF_PIXEL_SHADER_1_1) &&
+			!driver->queryFeature(video::EVDF_ARB_FRAGMENT_PROGRAM_1)){
+		infostream<<"generate_shader(): pixel shaders disabled "
+				"because of missing driver/hardware support."
+				<<std::endl;
+		pixel_program = "";
+	}
+	if(geometry_program != "" &&
+			!driver->queryFeature(video::EVDF_GEOMETRY_SHADER)){
+		infostream<<"generate_shader(): geometry shaders disabled "
+				"because of missing driver/hardware support."
+				<<std::endl;
+		geometry_program = "";
+	}
+
+	// If no shaders are used, don't make a separate material type
+	if(vertex_program == "" && pixel_program == "" && geometry_program == "")
+		return shaderinfo;
+
+	// 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 != "")
+		vertex_program_ptr = vertex_program.c_str();
+	if(pixel_program != "")
+		pixel_program_ptr = pixel_program.c_str();
+	if(geometry_program != "")
+		geometry_program_ptr = geometry_program.c_str();
+	s32 shadermat = -1;
+	if(is_highlevel){
+		infostream<<"Compiling high level shaders for "<<name<<std::endl;
+		shadermat = gpu->addHighLevelShaderMaterial(
+			vertex_program_ptr,   // Vertex shader program
+			"vertexMain",         // Vertex shader entry point
+			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
+			geometry_program_ptr, // Geometry shader program
+			"geometryMain",       // Geometry shader entry point
+			video::EGST_GS_4_0,   // Geometry shader version
+			scene::EPT_TRIANGLES,      // Geometry shader input
+			scene::EPT_TRIANGLE_STRIP, // Geometry shader output
+			0,                         // Support maximum number of vertices
+			callback,             // Set-constant callback
+			shaderinfo.material,  // Base material
+			1                     // Userdata passed to callback
+			);
+
+		if(shadermat == -1){
+			errorstream<<"generate_shader(): "
+					"failed to generate \""<<name<<"\", "
+					"addHighLevelShaderMaterial failed."
+					<<std::endl;
+			return shaderinfo;
+		}
+	}
+	else{
+		infostream<<"Compiling assembly shaders for "<<name<<std::endl;
+		shadermat = gpu->addShaderMaterial(
+			vertex_program_ptr,   // Vertex shader program
+			pixel_program_ptr,    // Pixel shader program
+			callback,             // Set-constant callback
+			shaderinfo.material,  // Base material
+			0                     // Userdata passed to callback
+			);
+
+		if(shadermat == -1){
+			errorstream<<"generate_shader(): "
+					"failed to generate \""<<name<<"\", "
+					"addShaderMaterial failed."
+					<<std::endl;
+			return shaderinfo;
+		}
+	}
+
+	// HACK, TODO: investigate this better
+	// Grab the material renderer once more so minetest doesn't crash on exit
+	driver->getMaterialRenderer(shadermat)->grab();
+
+	// Apply the newly created material type
+	shaderinfo.material = (video::E_MATERIAL_TYPE) shadermat;
+	return shaderinfo;
+}
+
+void load_shaders(std::string name, SourceShaderCache *sourcecache,
+		video::E_DRIVER_TYPE drivertype, s32 enable_shaders,
+		std::string &vertex_program, std::string &pixel_program,
+		std::string &geometry_program, bool &is_highlevel)
+{
+	vertex_program = "";
+	pixel_program = "";
+	geometry_program = "";
+	is_highlevel = false;
+
+	if(enable_shaders >= 2){
+		// Look for high level shaders
+		if(drivertype == video::EDT_DIRECT3D9){
+			// Direct3D 9: HLSL
+			// (All shaders in one file)
+			vertex_program = sourcecache->getOrLoad(name, "d3d9.hlsl");
+			pixel_program = vertex_program;
+			geometry_program = vertex_program;
+		}
+		else if(drivertype == video::EDT_OPENGL){
+			// OpenGL: GLSL
+			vertex_program = sourcecache->getOrLoad(name, "opengl_vertex.glsl");
+			pixel_program = sourcecache->getOrLoad(name, "opengl_fragment.glsl");
+			geometry_program = sourcecache->getOrLoad(name, "opengl_geometry.glsl");
+		}
+		if(vertex_program != "" || pixel_program != "" || geometry_program != ""){
+			is_highlevel = true;
+			return;
+		}
+	}
+
+	if(enable_shaders >= 1){
+		// Look for assembly shaders
+		if(drivertype == video::EDT_DIRECT3D8){
+			// Direct3D 8 assembly shaders
+			vertex_program = sourcecache->getOrLoad(name, "d3d8_vertex.asm");
+			pixel_program = sourcecache->getOrLoad(name, "d3d8_pixel.asm");
+		}
+		else if(drivertype == video::EDT_DIRECT3D9){
+			// Direct3D 9 assembly shaders
+			vertex_program = sourcecache->getOrLoad(name, "d3d9_vertex.asm");
+			pixel_program = sourcecache->getOrLoad(name, "d3d9_pixel.asm");
+		}
+		else if(drivertype == video::EDT_OPENGL){
+			// OpenGL assembly shaders
+			vertex_program = sourcecache->getOrLoad(name, "opengl_vertex.asm");
+			pixel_program = sourcecache->getOrLoad(name, "opengl_fragment.asm");
+		}
+		if(vertex_program != "" || pixel_program != "")
+			return;
+	}
+}

src/shader.h

@@ -0,0 +1,106 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2012 Kahrl <kahrl@gmx.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU 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 SHADER_HEADER
+#define SHADER_HEADER
+
+#include "irrlichttypes_extrabloated.h"
+#include "threads.h"
+#include <string>
+
+class IGameDef;
+
+/*
+	shader.{h,cpp}: Shader handling stuff.
+*/
+
+/*
+	Gets the path to a shader by first checking if the file
+	  name_of_shader/filename
+	exists in shader_path and if not, using the data path.
+
+	If not found, returns "".
+
+	Utilizes a thread-safe cache.
+*/
+std::string getShaderPath(const std::string &name_of_shader,
+		const std::string &filename);
+
+struct ShaderInfo
+{
+	std::string name;
+	video::E_MATERIAL_TYPE material;
+
+	ShaderInfo(): name(""), material(video::EMT_SOLID) {}
+};
+
+/*
+	Setter of constants for shaders
+*/
+
+namespace irr { namespace video {
+	class IMaterialRendererServices;
+} }
+
+class IShaderConstantSetter
+{
+public:
+	virtual ~IShaderConstantSetter(){};
+	virtual void onSetConstants(video::IMaterialRendererServices *services,
+			bool is_highlevel) = 0;
+};
+
+/*
+	ShaderSource creates and caches shaders.
+*/
+
+class IShaderSource
+{
+public:
+	IShaderSource(){}
+	virtual ~IShaderSource(){}
+	virtual u32 getShaderId(const std::string &name){return 0;}
+	virtual u32 getShaderIdDirect(const std::string &name){return 0;}
+	virtual std::string getShaderName(u32 id){return "";}
+	virtual ShaderInfo getShader(u32 id){return ShaderInfo();}
+	virtual ShaderInfo getShader(const std::string &name){return ShaderInfo();}
+};
+
+class IWritableShaderSource : public IShaderSource
+{
+public:
+	IWritableShaderSource(){}
+	virtual ~IWritableShaderSource(){}
+	virtual u32 getShaderId(const std::string &name){return 0;}
+	virtual u32 getShaderIdDirect(const std::string &name){return 0;}
+	virtual std::string getShaderName(u32 id){return "";}
+	virtual ShaderInfo getShader(u32 id){return ShaderInfo();}
+	virtual ShaderInfo getShader(const std::string &name){return ShaderInfo();}
+
+	virtual void processQueue()=0;
+	virtual void insertSourceShader(const std::string &name_of_shader,
+		const std::string &filename, const std::string &program)=0;
+	virtual void rebuildShaders()=0;
+	virtual void addGlobalConstantSetter(IShaderConstantSetter *setter)=0;
+};
+
+IWritableShaderSource* createShaderSource(IrrlichtDevice *device);
+
+#endif

src/tile.h

@@ -161,10 +161,9 @@ public:
 IWritableTextureSource* createTextureSource(IrrlichtDevice *device);
 
 enum MaterialType{
-	MATERIAL_ALPHA_NONE,
-	MATERIAL_ALPHA_VERTEX,
-	MATERIAL_ALPHA_SIMPLE, // >127 = opaque
-	MATERIAL_ALPHA_BLEND,
+	TILE_MATERIAL_BASIC,
+	TILE_MATERIAL_LIQUID_TRANSPARENT,
+	TILE_MATERIAL_LIQUID_OPAQUE,
 };
 
 // Material flags
@@ -178,6 +177,8 @@ enum MaterialType{
 // Animation made up by splitting the texture to vertical frames, as
 // defined by extra parameters
 #define MATERIAL_FLAG_ANIMATION_VERTICAL_FRAMES 0x08
+// Whether liquid shader should be used
+#define MATERIAL_FLAG_
 
 /*
 	This fully defines the looks of a tile.
@@ -188,9 +189,7 @@ struct TileSpec
 	TileSpec():
 		texture(0),
 		alpha(255),
-		//material_type(MATERIAL_ALPHA_NONE),
-		// Use this so that leaves don't need a separate material
-		material_type(MATERIAL_ALPHA_SIMPLE),
+		material_type(TILE_MATERIAL_BASIC),
 		material_flags(
 			//0 // <- DEBUG, Use the one below
 			MATERIAL_FLAG_BACKFACE_CULLING
@@ -218,15 +217,34 @@ struct TileSpec
 	// Sets everything else except the texture in the material
 	void applyMaterialOptions(video::SMaterial &material) const
 	{
-		if(material_type == MATERIAL_ALPHA_NONE)
-			material.MaterialType = video::EMT_SOLID;
-		else if(material_type == MATERIAL_ALPHA_VERTEX)
-			material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
-		else if(material_type == MATERIAL_ALPHA_SIMPLE)
+		switch(material_type){
+		case TILE_MATERIAL_BASIC:
 			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
-		else if(material_type == MATERIAL_ALPHA_BLEND)
-			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
-
+			break;
+		case TILE_MATERIAL_LIQUID_TRANSPARENT:
+			material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
+			break;
+		case TILE_MATERIAL_LIQUID_OPAQUE:
+			material.MaterialType = video::EMT_SOLID;
+			break;
+		}
+		material.BackfaceCulling = (material_flags & MATERIAL_FLAG_BACKFACE_CULLING) ? true : false;
+	}
+	void applyMaterialOptionsWithShaders(video::SMaterial &material,
+			const video::E_MATERIAL_TYPE &basic,
+			const video::E_MATERIAL_TYPE &liquid) const
+	{
+		switch(material_type){
+		case TILE_MATERIAL_BASIC:
+			material.MaterialType = basic;
+			break;
+		case TILE_MATERIAL_LIQUID_TRANSPARENT:
+			material.MaterialType = liquid;
+			break;
+		case TILE_MATERIAL_LIQUID_OPAQUE:
+			material.MaterialType = liquid;
+			break;
+		}
 		material.BackfaceCulling = (material_flags & MATERIAL_FLAG_BACKFACE_CULLING) ? true : false;
 	}
 	

src/util/container.h

@@ -107,6 +107,17 @@ public:
 		return true;
 	}
 
+	core::list<Value> getValues()
+	{
+		core::list<Value> result;
+		for(typename core::map<Key, Value>::Iterator
+				i = m_values.getIterator();
+				i.atEnd() == false; i++){
+			result.push_back(i.getNode()->getValue());
+		}
+		return result;
+	}
+
 private:
 	core::map<Key, Value> m_values;
 	JMutex m_mutex;