Add support for dpi based HUD scaling

Add support for (configurable) multiline hotbar
Improved screensize handling
Add userdefined gui scale by BlockMen

13 files changed, 266 insertions, 151 deletions

diff --git a/doc/menu_lua_api.txt b/doc/menu_lua_api.txt
index 87e37dd0d..321f74a8c 100644
--- a/doc/menu_lua_api.txt
+++ b/doc/menu_lua_api.txt
@@ -116,6 +116,14 @@ engine.file_open_dialog(formname,caption)
 ^     -if dialog was canceled "_cancelled"
 ^        will be added to fieldname value is set to formname itself
 ^ returns nil or selected file/folder
+engine.get_screen_info()
+^ returns {
+	density         = <screen density 0.75,1.0,2.0,3.0 ... (dpi)>,
+	display_width   = <width of display>,
+	display_height  = <height of display>,
+	window_width    = <current window width>,
+	window_height   = <current window height>
+	}
 
 Games:
 engine.get_game(index)
@@ -198,7 +206,7 @@ engine.handle_async(async_job,parameters,finished)
 ^ execute a function asynchronously
 ^ async_job is a function receiving one parameter and returning one parameter
 ^ parameters parameter table passed to async_job
-^ finished function to be called once async_job has finished 
+^ finished function to be called once async_job has finished
 ^    the result of async_job is passed to this function
 
 Limitations of Async operations
diff --git a/minetest.conf.example b/minetest.conf.example
index 548adccee..707aa675e 100644
--- a/minetest.conf.example
+++ b/minetest.conf.example
@@ -140,6 +140,8 @@
 #crosshair_color = (255,255,255)
 # Cross alpha (opaqueness, between 0 and 255)
 #crosshair_alpha = 255
+# scale gui by a user specified value
+#gui_scaling = 1.0
 # Sensitivity multiplier
 #mouse_sensitivity = 0.2
 # Sound settings
@@ -147,6 +149,9 @@
 #sound_volume = 0.7
 # Whether node texture animations should be desynchronized per MapBlock
 #desynchronize_mapblock_texture_animation = true
+# maximum percentage of current window to be used for hotbar
+# (usefull if you've there's something to be displayed right or left of hotbar)
+#hud_hotbar_max_width = 1.0
 # Texture filtering settings
 #mip_map = false
 #anisotropic_filter = false
@@ -165,7 +170,7 @@
 #normalmaps_strength = 0.6
 # Strength of generated normalmaps
 #normalmaps_smooth = 1
-# Defines sampling step of texture (0 - 2) 
+# Defines sampling step of texture (0 - 2)
 # Higher the value normal maps will be smoother
 #enable_parallax_occlusion = false
 # Scale of parallax occlusion effect
diff --git a/src/camera.cpp b/src/camera.cpp
index b49e8e748..254827803 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -249,7 +249,7 @@ void Camera::step(f32 dtime)
 }
 
 void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
-		v2u32 screensize, f32 tool_reload_ratio,
+		f32 tool_reload_ratio,
 		int current_camera_mode, ClientEnvironment &c_env)
 {
 	// Get player position
@@ -422,7 +422,7 @@ void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime,
 	fov_degrees = MYMIN(fov_degrees, 170.0);
 
 	// FOV and aspect ratio
-	m_aspect = (f32)screensize.X / (f32) screensize.Y;
+	m_aspect = (f32) porting::getWindowSize().X / (f32) porting::getWindowSize().Y;
 	m_fov_y = fov_degrees * M_PI / 180.0;
 	// Increase vertical FOV on lower aspect ratios (<16:10)
 	m_fov_y *= MYMAX(1.0, MYMIN(1.4, sqrt(16./10. / m_aspect)));
diff --git a/src/camera.h b/src/camera.h
index d1c3b59d4..63d109f1f 100644
--- a/src/camera.h
+++ b/src/camera.h
@@ -117,7 +117,7 @@ public:
 	// Update the camera from the local player's position.
 	// busytime is used to adjust the viewing range.
 	void update(LocalPlayer* player, f32 frametime, f32 busytime,
-			v2u32 screensize, f32 tool_reload_ratio,
+			f32 tool_reload_ratio,
 			int current_camera_mode, ClientEnvironment &c_env);
 
 	// Render distance feedback loop
diff --git a/src/defaultsettings.cpp b/src/defaultsettings.cpp
index ff3bf5b88..e245abb83 100644
--- a/src/defaultsettings.cpp
+++ b/src/defaultsettings.cpp
@@ -119,10 +119,12 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("selectionbox_color", "(0,0,0)");
 	settings->setDefault("crosshair_color", "(255,255,255)");
 	settings->setDefault("crosshair_alpha", "255");
+	settings->setDefault("gui_scaling", "1.0");
 	settings->setDefault("mouse_sensitivity", "0.2");
 	settings->setDefault("enable_sound", "true");
 	settings->setDefault("sound_volume", "0.8");
 	settings->setDefault("desynchronize_mapblock_texture_animation", "true");
+	settings->setDefault("hud_hotbar_max_width","1.0");
 
 	settings->setDefault("mip_map", "false");
 	settings->setDefault("anisotropic_filter", "false");
diff --git a/src/game.cpp b/src/game.cpp
index 2d6205140..bcf59fb26 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1099,7 +1099,6 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 	// Calculate text height using the font
 	u32 text_height = font->getDimension(L"Random test string").Height;
 
-	v2u32 last_screensize(0,0);
 	v2u32 screensize = driver->getScreenSize();
 	
 	/*
@@ -1842,15 +1841,6 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 		/*
 			Random calculations
 		*/
-		last_screensize = screensize;
-		screensize = driver->getScreenSize();
-		v2s32 displaycenter(screensize.X/2,screensize.Y/2);
-		//bool screensize_changed = screensize != last_screensize;
-
-			
-		// Update HUD values
-		hud.screensize    = screensize;
-		hud.displaycenter = displaycenter;
 		hud.resizeHotbar();
 		
 		// Hilight boxes collected during the loop and displayed
@@ -2267,10 +2257,11 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 				first_loop_after_window_activation = false;
 			}
 			else{
-				s32 dx = input->getMousePos().X - displaycenter.X;
-				s32 dy = input->getMousePos().Y - displaycenter.Y;
-				if(invert_mouse || player->camera_mode == CAMERA_MODE_THIRD_FRONT)
+				s32 dx = input->getMousePos().X - (driver->getScreenSize().Width/2);
+				s32 dy = input->getMousePos().Y - (driver->getScreenSize().Height/2);
+				if(invert_mouse || player->camera_mode == CAMERA_MODE_THIRD_FRONT) {
 					dy = -dy;
+				}
 				//infostream<<"window active, pos difference "<<dx<<","<<dy<<std::endl;
 				
 				/*const float keyspeed = 500;
@@ -2292,7 +2283,8 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 				
 				turn_amount = v2f(dx, dy).getLength() * d;
 			}
-			input->setMousePos(displaycenter.X, displaycenter.Y);
+			input->setMousePos((driver->getScreenSize().Width/2),
+					(driver->getScreenSize().Height/2));
 		}
 		else{
 			// Mac OSX gets upset if this is set every frame
@@ -2657,7 +2649,7 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 		}
 		player->camera_mode = current_camera_mode;
 		tool_reload_ratio = MYMIN(tool_reload_ratio, 1.0);
-		camera.update(player, dtime, busytime, screensize, tool_reload_ratio,
+		camera.update(player, dtime, busytime, tool_reload_ratio,
 				current_camera_mode, client.getEnv());
 		camera.step(dtime);
 
@@ -3538,8 +3530,8 @@ void the_game(bool &kill, bool random_input, InputHandler *input,
 		*/
 		if (show_hud)
 		{
-			hud.drawHotbar(v2s32(displaycenter.X, screensize.Y),
-					client.getHP(), client.getPlayerItem(), client.getBreath());
+			hud.drawHotbar(client.getHP(), client.getPlayerItem(),
+					client.getBreath());
 		}
 
 		/*
diff --git a/src/hud.cpp b/src/hud.cpp
index 343b548e9..f5f959903 100644
--- a/src/hud.cpp
+++ b/src/hud.cpp
@@ -30,7 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "tile.h"
 #include "localplayer.h"
 #include "camera.h"
-
+#include "porting.h"
 #include <IGUIStaticText.h>
 
 
@@ -47,9 +47,15 @@ Hud::Hud(video::IVideoDriver *driver, scene::ISceneManager* smgr,
 	this->player      = player;
 	this->inventory   = inventory;
 	
-	screensize       = v2u32(0, 0);
-	displaycenter    = v2s32(0, 0);
-	hotbar_imagesize = 48;
+	m_screensize       = v2u32(0, 0);
+	m_displaycenter    = v2s32(0, 0);
+	m_hotbar_imagesize = HOTBAR_IMAGE_SIZE * porting::getDisplayDensity();
+	m_padding = m_hotbar_imagesize / 12;
+
+	const video::SColor hbar_color(255, 255, 255, 255);
+	for (unsigned int i=0; i < 4; i++ ){
+		hbar_colors[i] = hbar_color;
+	}
 	
 	tsrc = gamedef->getTextureSource();
 	
@@ -74,92 +80,21 @@ Hud::Hud(video::IVideoDriver *driver, scene::ISceneManager* smgr,
 	use_hotbar_selected_image = false;
 }
 
+void Hud::drawItem(const ItemStack &item, const core::rect<s32>& rect, bool selected) {
 
-//NOTE: selectitem = 0 -> no selected; selectitem 1-based
-void Hud::drawItem(v2s32 upperleftpos, s32 imgsize, s32 itemcount,
-		InventoryList *mainlist, u16 selectitem, u16 direction)
-{
-	s32 padding = imgsize / 12;
-	s32 height  = imgsize + padding * 2;
-	s32 width   = itemcount * (imgsize + padding * 2);
-	if (direction == HUD_DIR_TOP_BOTTOM || direction == HUD_DIR_BOTTOM_TOP) {
-		width  = imgsize + padding * 2;
-		height = itemcount * (imgsize + padding * 2);
-	}
-	s32 fullimglen = imgsize + padding * 2;
-
-	// Position of upper left corner of bar
-	v2s32 pos = upperleftpos;
-
-	// Draw background color
-	/*core::rect<s32> barrect(0,0,width,height);
-	barrect += pos;
-	video::SColor bgcolor(255,128,128,128);
-	driver->draw2DRectangle(bgcolor, barrect, NULL);*/
-
-	core::rect<s32> imgrect(0, 0, imgsize, imgsize);
-	const video::SColor hbar_color(255, 255, 255, 255);
-	const video::SColor hbar_colors[] = {hbar_color, hbar_color, hbar_color, hbar_color};
-
-	if (hotbar_image != player->hotbar_image) {
-		hotbar_image = player->hotbar_image;
-		if (hotbar_image != "")
-			use_hotbar_image = tsrc->isKnownSourceImage(hotbar_image);
-		else
-			use_hotbar_image = false;
-	}
-
-	if (hotbar_selected_image != player->hotbar_selected_image) {
-		hotbar_selected_image = player->hotbar_selected_image;
-		if (hotbar_selected_image != "")
-			use_hotbar_selected_image = tsrc->isKnownSourceImage(hotbar_selected_image);
-		else
-			use_hotbar_selected_image = false;
-	}
-
-	if (use_hotbar_image) {
-		core::rect<s32> imgrect2(-padding/2, -padding/2, width+padding/2, height+padding/2);
-		core::rect<s32> rect2 = imgrect2 + pos;
-		video::ITexture *texture = tsrc->getTexture(hotbar_image);
-		core::dimension2di imgsize(texture->getOriginalSize());
-		driver->draw2DImage(texture, rect2,
-			core::rect<s32>(core::position2d<s32>(0,0), imgsize),
-			NULL, hbar_colors, true);
-	}
-
-	for (s32 i = 0; i < itemcount && (size_t)i < mainlist->getSize(); i++)
-	{
-		const ItemStack &item = mainlist->getItem(i);
-
-		v2s32 steppos;
-		switch (direction) {
-			case HUD_DIR_RIGHT_LEFT:
-				steppos = v2s32(-(padding + i * fullimglen), padding);
-				break;
-			case HUD_DIR_TOP_BOTTOM:
-				steppos = v2s32(padding, padding + i * fullimglen);
-				break;
-			case HUD_DIR_BOTTOM_TOP:
-				steppos = v2s32(padding, -(padding + i * fullimglen));
-				break;
-			default:
-				steppos = v2s32(padding + i * fullimglen, padding);
-		}
-			
-		core::rect<s32> rect = imgrect + pos + steppos;
-
-		if (selectitem == i + 1) {
+	if (selected) {
 			if (use_hotbar_selected_image) {
-				core::rect<s32> imgrect2(-padding*2, -padding*2, height, height);
-				rect = imgrect2 + pos + steppos;
+			core::rect<s32> imgrect2 = rect;
+			imgrect2.UpperLeftCorner.X  -= m_padding;
+			imgrect2.UpperLeftCorner.Y  -= m_padding;
+			imgrect2.LowerRightCorner.X += m_padding;
+			imgrect2.LowerRightCorner.Y += m_padding;
 				video::ITexture *texture = tsrc->getTexture(hotbar_selected_image);
 				core::dimension2di imgsize(texture->getOriginalSize());
-				driver->draw2DImage(texture, rect,
+			driver->draw2DImage(texture, imgrect2,
 					core::rect<s32>(core::position2d<s32>(0,0), imgsize),
 					NULL, hbar_colors, true);
-				rect = imgrect + pos + steppos;
 			} else {
-				rect = imgrect + pos + steppos;
 				video::SColor c_outside(255,255,0,0);
 				//video::SColor c_outside(255,0,0,0);
 				//video::SColor c_inside(255,192,192,192);
@@ -170,23 +105,23 @@ void Hud::drawItem(v2s32 upperleftpos, s32 imgsize, s32 itemcount,
 				// Black base borders
 				driver->draw2DRectangle(c_outside,
 					core::rect<s32>(
-						v2s32(x1 - padding, y1 - padding),
-						v2s32(x2 + padding, y1)
+					v2s32(x1 - m_padding, y1 - m_padding),
+					v2s32(x2 + m_padding, y1)
 					), NULL);
 				driver->draw2DRectangle(c_outside,
 					core::rect<s32>(
-						v2s32(x1 - padding, y2),
-						v2s32(x2 + padding, y2 + padding)
+					v2s32(x1 - m_padding, y2),
+					v2s32(x2 + m_padding, y2 + m_padding)
 					), NULL);
 				driver->draw2DRectangle(c_outside,
 					core::rect<s32>(
-						v2s32(x1 - padding, y1),
+					v2s32(x1 - m_padding, y1),
 						v2s32(x1, y2)
 					), NULL);
 				driver->draw2DRectangle(c_outside,
 					core::rect<s32>(
 						v2s32(x2, y1),
-						v2s32(x2 + padding, y2)
+					v2s32(x2 + m_padding, y2)
 					), NULL);
 				/*// Light inside borders
 				driver->draw2DRectangle(c_inside,
@@ -218,6 +153,72 @@ void Hud::drawItem(v2s32 upperleftpos, s32 imgsize, s32 itemcount,
 			driver->draw2DRectangle(bgcolor2, rect, NULL);
 		drawItemStack(driver, font, item, rect, NULL, gamedef);
 	}
+
+//NOTE: selectitem = 0 -> no selected; selectitem 1-based
+void Hud::drawItems(v2s32 upperleftpos, s32 itemcount, s32 offset,
+		InventoryList *mainlist, u16 selectitem, u16 direction)
+{
+	s32 height  = m_hotbar_imagesize + m_padding * 2;
+	s32 width   = (itemcount - offset) * (m_hotbar_imagesize + m_padding * 2);
+
+	if (direction == HUD_DIR_TOP_BOTTOM || direction == HUD_DIR_BOTTOM_TOP) {
+		width  = m_hotbar_imagesize + m_padding * 2;
+		height = (itemcount - offset) * (m_hotbar_imagesize + m_padding * 2);
+	}
+
+	// Position of upper left corner of bar
+	v2s32 pos = upperleftpos;
+
+	if (hotbar_image != player->hotbar_image) {
+		hotbar_image = player->hotbar_image;
+		if (hotbar_image != "")
+			use_hotbar_image = tsrc->isKnownSourceImage(hotbar_image);
+		else
+			use_hotbar_image = false;
+	}
+
+	if (hotbar_selected_image != player->hotbar_selected_image) {
+		hotbar_selected_image = player->hotbar_selected_image;
+		if (hotbar_selected_image != "")
+			use_hotbar_selected_image = tsrc->isKnownSourceImage(hotbar_selected_image);
+		else
+			use_hotbar_selected_image = false;
+	}
+
+	if (use_hotbar_image) {
+		core::rect<s32> imgrect2(-m_padding/2, -m_padding/2, width+m_padding/2, height+m_padding/2);
+		core::rect<s32> rect2 = imgrect2 + pos;
+		video::ITexture *texture = tsrc->getTexture(hotbar_image);
+		core::dimension2di imgsize(texture->getOriginalSize());
+		driver->draw2DImage(texture, rect2,
+			core::rect<s32>(core::position2d<s32>(0,0), imgsize),
+			NULL, hbar_colors, true);
+	}
+
+	for (s32 i = offset; i < itemcount && (size_t)i < mainlist->getSize(); i++)
+	{
+		v2s32 steppos;
+		s32 fullimglen = m_hotbar_imagesize + m_padding * 2;
+
+		core::rect<s32> imgrect(0, 0, m_hotbar_imagesize, m_hotbar_imagesize);
+
+		switch (direction) {
+			case HUD_DIR_RIGHT_LEFT:
+				steppos = v2s32(-(m_padding + (i - offset) * fullimglen), m_padding);
+				break;
+			case HUD_DIR_TOP_BOTTOM:
+				steppos = v2s32(m_padding, m_padding + (i - offset) * fullimglen);
+				break;
+			case HUD_DIR_BOTTOM_TOP:
+				steppos = v2s32(m_padding, -(m_padding + (i - offset) * fullimglen));
+				break;
+			default:
+				steppos = v2s32(m_padding + (i - offset) * fullimglen, m_padding);
+				break;
+		}
+
+		drawItem(mainlist->getItem(i), (imgrect + pos + steppos), (i +1) == selectitem );
+	}
 }
 
 
@@ -227,7 +228,7 @@ void Hud::drawLuaElements() {
 		if (!e)
 			continue;
 		
-		v2s32 pos(e->pos.X * screensize.X, e->pos.Y * screensize.Y);
+		v2s32 pos(e->pos.X * m_screensize.X, e->pos.Y * m_screensize.Y);
 		switch (e->type) {
 			case HUD_ELEM_IMAGE: {
 				video::ITexture *texture = tsrc->getTexture(e->text);
@@ -240,9 +241,9 @@ void Hud::drawLuaElements() {
 				v2s32 dstsize(imgsize.Width * e->scale.X,
 				              imgsize.Height * e->scale.Y);
 				if (e->scale.X < 0)
-					dstsize.X = screensize.X * (e->scale.X * -0.01);
+					dstsize.X = m_screensize.X * (e->scale.X * -0.01);
 				if (e->scale.Y < 0)
-					dstsize.Y = screensize.Y * (e->scale.Y * -0.01);
+					dstsize.Y = m_screensize.Y * (e->scale.Y * -0.01);
 				v2s32 offset((e->align.X - 1.0) * dstsize.X / 2,
 				             (e->align.Y - 1.0) * dstsize.Y / 2);
 				core::rect<s32> rect(0, 0, dstsize.X, dstsize.Y);
@@ -269,7 +270,7 @@ void Hud::drawLuaElements() {
 				break; }
 			case HUD_ELEM_INVENTORY: {
 				InventoryList *inv = inventory->getList(e->text);
-				drawItem(pos, hotbar_imagesize, e->number, inv, e->item, e->dir);
+				drawItems(pos, e->number, 0, inv, e->item, e->dir);
 				break; }
 			case HUD_ELEM_WAYPOINT: {
 				v3f p_pos = player->getPosition() / BS;
@@ -284,8 +285,8 @@ void Hud::drawLuaElements() {
 					break;
 				f32 zDiv = transformed_pos[3] == 0.0f ? 1.0f :
 					core::reciprocal(transformed_pos[3]);
-				pos.X = screensize.X * (0.5 * transformed_pos[0] * zDiv + 0.5);
-				pos.Y = screensize.Y * (0.5 - transformed_pos[1] * zDiv * 0.5);
+				pos.X = m_screensize.X * (0.5 * transformed_pos[0] * zDiv + 0.5);
+				pos.Y = m_screensize.Y * (0.5 - transformed_pos[1] * zDiv * 0.5);
 				video::SColor color(255, (e->number >> 16) & 0xFF,
 										 (e->number >> 8)  & 0xFF,
 										 (e->number >> 0)  & 0xFF);
@@ -360,7 +361,10 @@ void Hud::drawStatbar(v2s32 pos, u16 corner, u16 drawdir, std::string texture, s
 }
 
 
-void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s32 breath) {
+void Hud::drawHotbar(s32 halfheartcount, u16 playeritem, s32 breath) {
+
+	v2s32 centerlowerpos(m_displaycenter.X, m_screensize.Y);
+
 	InventoryList *mainlist = inventory->getList("main");
 	if (mainlist == NULL) {
 		//silently ignore this we may not be initialized completely
@@ -368,12 +372,27 @@ void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s
 	}
 	
 	s32 hotbar_itemcount = player->hud_hotbar_itemcount;
-	s32 padding = hotbar_imagesize / 12;
-	s32 width = hotbar_itemcount * (hotbar_imagesize + padding * 2);
-	v2s32 pos = centerlowerpos - v2s32(width / 2, hotbar_imagesize + padding * 3);
-	
-	if (player->hud_flags & HUD_FLAG_HOTBAR_VISIBLE)
-		drawItem(pos, hotbar_imagesize, hotbar_itemcount, mainlist, playeritem + 1, 0);
+	s32 width = hotbar_itemcount * (m_hotbar_imagesize + m_padding * 2);
+	v2s32 pos = centerlowerpos - v2s32(width / 2, m_hotbar_imagesize + m_padding * 3);
+
+	if ( (float) width / (float) porting::getWindowSize().X <=
+			g_settings->getFloat("hud_hotbar_max_width")) {
+		if (player->hud_flags & HUD_FLAG_HOTBAR_VISIBLE) {
+			drawItems(pos, hotbar_itemcount, 0, mainlist, playeritem + 1, 0);
+		}
+	}
+	else {
+		pos.X += width/4;
+
+		v2s32 secondpos = pos;
+		pos = pos - v2s32(0, m_hotbar_imagesize + m_padding);
+
+		if (player->hud_flags & HUD_FLAG_HOTBAR_VISIBLE) {
+			drawItems(pos, hotbar_itemcount/2, 0, mainlist, playeritem + 1, 0);
+			drawItems(secondpos, hotbar_itemcount, hotbar_itemcount/2, mainlist, playeritem + 1, 0);
+		}
+	}
+
 	if (player->hud_flags & HUD_FLAG_HEALTHBAR_VISIBLE)
 		drawStatbar(pos - v2s32(0, 4), HUD_CORNER_LOWER, HUD_DIR_LEFT_RIGHT,
 				"heart.png", halfheartcount, v2s32(0, 0));
@@ -385,22 +404,23 @@ void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s
 
 void Hud::drawCrosshair() {
 	if (!(player->hud_flags & HUD_FLAG_CROSSHAIR_VISIBLE) ||
-		player->camera_mode == CAMERA_MODE_THIRD_FRONT)
+			(player->camera_mode == CAMERA_MODE_THIRD_FRONT)) {
 		return;
+	}
 		
 	if (use_crosshair_image) {
 		video::ITexture *crosshair = tsrc->getTexture("crosshair.png");
 		v2u32 size  = crosshair->getOriginalSize();
-		v2s32 lsize = v2s32(displaycenter.X - (size.X / 2),
-							displaycenter.Y - (size.Y / 2));
+		v2s32 lsize = v2s32(m_displaycenter.X - (size.X / 2),
+				m_displaycenter.Y - (size.Y / 2));
 		driver->draw2DImage(crosshair, lsize,
 				core::rect<s32>(0, 0, size.X, size.Y),
 				0, crosshair_argb, true);
 	} else {
-		driver->draw2DLine(displaycenter - v2s32(10, 0),
-				displaycenter + v2s32(10, 0), crosshair_argb);
-		driver->draw2DLine(displaycenter - v2s32(0, 10),
-				displaycenter + v2s32(0, 10), crosshair_argb);
+		driver->draw2DLine(m_displaycenter - v2s32(10, 0),
+				m_displaycenter + v2s32(10, 0), crosshair_argb);
+		driver->draw2DLine(m_displaycenter - v2s32(0, 10),
+				m_displaycenter + v2s32(0, 10), crosshair_argb);
 	}
 }
 
@@ -415,12 +435,12 @@ void Hud::drawSelectionBoxes(std::vector<aabb3f> &hilightboxes) {
 
 
 void Hud::resizeHotbar() {
-	if (screensize.Y <= 800)
-		hotbar_imagesize = 32;
-	else if (screensize.Y <= 1280)
-		hotbar_imagesize = 48;
-	else
-		hotbar_imagesize = 64;
+	if (m_screensize != porting::getWindowSize()) {
+		m_hotbar_imagesize = porting::getDisplayDensity() * HOTBAR_IMAGE_SIZE;
+		m_padding = m_hotbar_imagesize / 12;
+		m_screensize = porting::getWindowSize();
+		m_displaycenter = v2s32(m_screensize.X/2,m_screensize.Y/2);
+	}
 }
 
 void drawItemStack(video::IVideoDriver *driver,
diff --git a/src/hud.h b/src/hud.h
index 1a24d0945..3897a850c 100644
--- a/src/hud.h
+++ b/src/hud.h
@@ -45,6 +45,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define HUD_HOTBAR_ITEMCOUNT_DEFAULT 8
 #define HUD_HOTBAR_ITEMCOUNT_MAX     23
 
+
+#define HOTBAR_IMAGE_SIZE 48
+
 enum HudElementType {
 	HUD_ELEM_IMAGE     = 0,
 	HUD_ELEM_TEXT      = 1,
@@ -105,10 +108,6 @@ public:
 	Inventory *inventory;
 	ITextureSource *tsrc;
 
-	v2u32 screensize;
-	v2s32 displaycenter;
-	s32 hotbar_imagesize;
-	
 	video::SColor crosshair_argb;
 	video::SColor selectionbox_argb;
 	bool use_crosshair_image;
@@ -122,17 +121,25 @@ public:
 		u32 text_height, IGameDef *gamedef,
 		LocalPlayer *player, Inventory *inventory);
 	
-	void drawItem(v2s32 upperleftpos, s32 imgsize, s32 itemcount,
-		InventoryList *mainlist, u16 selectitem, u16 direction);
+	void drawHotbar(s32 halfheartcount, u16 playeritem, s32 breath);
+	void resizeHotbar();
+	void drawCrosshair();
+	void drawSelectionBoxes(std::vector<aabb3f> &hilightboxes);
 	void drawLuaElements();
+private:
 	void drawStatbar(v2s32 pos, u16 corner, u16 drawdir,
 					 std::string texture, s32 count, v2s32 offset);
 	
-	void drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s32 breath);
-	void resizeHotbar();
+	void drawItems(v2s32 upperleftpos, s32 itemcount, s32 offset,
+		InventoryList *mainlist, u16 selectitem, u16 direction);
+
+	void drawItem(const ItemStack &item, const core::rect<s32>& rect, bool selected);
 	
-	void drawCrosshair();
-	void drawSelectionBoxes(std::vector<aabb3f> &hilightboxes);
+	v2u32 m_screensize;
+	v2s32 m_displaycenter;
+	s32 m_hotbar_imagesize;
+	s32 m_padding;
+	video::SColor hbar_colors[4];
 };
 
 void drawItemStack(video::IVideoDriver *driver,
diff --git a/src/main.cpp b/src/main.cpp
index ddd55d1a4..08e8c1ee2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1447,8 +1447,10 @@ int main(int argc, char *argv[])
 
 	device = createDeviceEx(params);
 
-	if (device == 0)
+	if (device == 0) {
 		return 1; // could not create selected driver.
+	}
+	porting::initIrrlicht(device);
 
 	/*
 		Continue initialization
diff --git a/src/porting.cpp b/src/porting.cpp
index 53b3a3784..d1e3cdd70 100644
--- a/src/porting.cpp
+++ b/src/porting.cpp
@@ -44,6 +44,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 #include "log.h"
 #include "util/string.h"
+#include "main.h"
+#include "settings.h"
 #include <list>
 
 namespace porting
@@ -470,8 +472,9 @@ void initializePaths()
 	std::string static_sharedir = STATIC_SHAREDIR;
 	if(static_sharedir != "" && static_sharedir != ".")
 		trylist.push_back(static_sharedir);
-	trylist.push_back(bindir + "/../share/" + PROJECT_NAME);
-	trylist.push_back(bindir + "/..");
+	trylist.push_back(
+			bindir + DIR_DELIM + ".." + DIR_DELIM + "share" + DIR_DELIM + PROJECT_NAME);
+	trylist.push_back(bindir + DIR_DELIM + "..");
 
 	for(std::list<std::string>::const_iterator i = trylist.begin();
 			i != trylist.end(); i++)
@@ -528,5 +531,40 @@ void initializePaths()
 #endif // RUN_IN_PLACE
 }
 
+static irr::IrrlichtDevice* device;
+
+void initIrrlicht(irr::IrrlichtDevice * _device) {
+	device = _device;
+}
+
+#ifndef SERVER
+v2u32 getWindowSize() {
+	return device->getVideoDriver()->getScreenSize();
+}
+
+
+float getDisplayDensity() {
+	float gui_scaling = g_settings->getFloat("gui_scaling");
+	// using Y here feels like a bug, this needs to be discussed later!
+	if (getWindowSize().Y <= 800) {
+		return (2.0/3.0) * gui_scaling;
+	}
+	if (getWindowSize().Y <= 1280) {
+		return 1.0 * gui_scaling;
+	}
+
+	return (4.0/3.0) * gui_scaling;
+}
+
+v2u32 getDisplaySize() {
+	IrrlichtDevice *nulldevice = createDevice(video::EDT_NULL);
+
+	core::dimension2d<u32> deskres = nulldevice->getVideoModeList()->getDesktopResolution();
+	nulldevice -> drop();
+
+	return deskres;
+}
+#endif
+
 } //namespace porting
 
diff --git a/src/porting.h b/src/porting.h
index f19ff3a07..90bfa2502 100644
--- a/src/porting.h
+++ b/src/porting.h
@@ -28,12 +28,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	#ifdef _WIN32_WINNT
 		#undef _WIN32_WINNT
 	#endif
-	#define _WIN32_WINNT 0x0501 // We need to do this before any other headers 
+	#define _WIN32_WINNT 0x0501 // We need to do this before any other headers
 		// because those might include sdkddkver.h which defines _WIN32_WINNT if not already set
 #endif
 
 #include <string>
+#include "irrlicht.h"
 #include "irrlichttypes.h" // u32
+#include "irrlichttypes_extrabloated.h"
 #include "debug.h"
 #include "constants.h"
 #include "gettime.h"
@@ -178,6 +180,8 @@ bool threadSetPriority(threadid_t tid, int prio);
 */
 std::string get_sysinfo();
 
+void initIrrlicht(irr::IrrlichtDevice * );
+
 /*
 	Resolution is 10-20ms.
 	Remember to check for overflows.
@@ -318,6 +322,13 @@ inline u32 getTime(TimePrecision prec)
 	inline void setThreadName(const char* name) {}
 #endif
 
+#ifndef SERVER
+float getDisplayDensity();
+
+v2u32 getDisplaySize();
+v2u32 getWindowSize();
+#endif
+
 } // namespace porting
 
 #endif // PORTING_HEADER
diff --git a/src/script/lua_api/l_mainmenu.cpp b/src/script/lua_api/l_mainmenu.cpp
index fbb70c389..5de1c77f0 100644
--- a/src/script/lua_api/l_mainmenu.cpp
+++ b/src/script/lua_api/l_mainmenu.cpp
@@ -1003,6 +1003,33 @@ int ModApiMainMenu::l_gettext(lua_State *L)
 }
 
 /******************************************************************************/
+int ModApiMainMenu::l_get_screen_info(lua_State *L)
+{
+	lua_newtable(L);
+	int top = lua_gettop(L);
+	lua_pushstring(L,"density");
+	lua_pushnumber(L,porting::getDisplayDensity());
+	lua_settable(L, top);
+
+	lua_pushstring(L,"display_width");
+	lua_pushnumber(L,porting::getDisplaySize().X);
+	lua_settable(L, top);
+
+	lua_pushstring(L,"display_height");
+	lua_pushnumber(L,porting::getDisplaySize().Y);
+	lua_settable(L, top);
+
+	lua_pushstring(L,"window_width");
+	lua_pushnumber(L,porting::getWindowSize().X);
+	lua_settable(L, top);
+
+	lua_pushstring(L,"window_height");
+	lua_pushnumber(L,porting::getWindowSize().Y);
+	lua_settable(L, top);
+	return 1;
+}
+
+/******************************************************************************/
 int ModApiMainMenu::l_do_async_callback(lua_State *L)
 {
 	GUIEngine* engine = getGuiEngine(L);
@@ -1060,6 +1087,7 @@ void ModApiMainMenu::Initialize(lua_State *L, int top)
 	API_FCT(sound_play);
 	API_FCT(sound_stop);
 	API_FCT(gettext);
+	API_FCT(get_screen_info);
 	API_FCT(do_async_callback);
 }
 
diff --git a/src/script/lua_api/l_mainmenu.h b/src/script/lua_api/l_mainmenu.h
index 69011c7b5..b711f2f86 100644
--- a/src/script/lua_api/l_mainmenu.h
+++ b/src/script/lua_api/l_mainmenu.h
@@ -103,6 +103,8 @@ private:
 
 	static int l_update_formspec(lua_State *L);
 
+	static int l_get_screen_info(lua_State *L);
+
 	//filesystem
 
 	static int l_get_scriptdir(lua_State *L);