Add on_object_hp_change callback and nametag images

builtin/client/register.lua

@@ -106,6 +106,7 @@ core.registered_on_recieve_physics_override, core.register_on_recieve_physics_ov
 core.registered_on_play_sound, core.register_on_play_sound = make_registration()
 core.registered_on_spawn_particle, core.register_on_spawn_particle = make_registration()
 core.registered_on_object_properties_change, core.register_on_object_properties_change = make_registration()
+core.registered_on_object_hp_change, core.register_on_object_hp_change = make_registration()
 
 core.registered_nodes = {}
 core.registered_items = {}

doc/client_lua_api.txt

@@ -766,6 +766,8 @@ Call these functions only at load time!
 * `minetest.register_on_object_properties_change(function(obj))`
     * Called every time the properties of an object are changed server-side
     * May modify the object's properties without the fear of infinite recursion
+* `minetest.register_on_object_hp_change(function(obj))`
+    * Called every time the hp of an object are changes server-side
 
 ### Setting-related
 * `minetest.settings`: Settings object containing all of the settings from the
@@ -1422,6 +1424,7 @@ This is basically a reference to a C++ `GenericCAO`.
 * `punch()`: punches the object
 * `rightclick()`: rightclicks the object
 * `remove()`: removes the object permanently
+* `set_nametag_images(images)`: Provides a list of images to be drawn below the nametag
 
 ### `Raycast`
 

src/client/camera.cpp

@@ -35,6 +35,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/numeric.h"
 #include "constants.h"
 #include "fontengine.h"
+#include "guiscalingfilter.h"
 #include "script/scripting_client.h"
 
 #define CAMERA_OFFSET_STEP 200
@@ -715,7 +716,7 @@ void Camera::drawNametags()
 			screen_pos.Y = screensize.Y *
 				(0.5 - transformed_pos[1] * zDiv * 0.5) - textsize.Height / 2;
 			core::rect<s32> size(0, 0, textsize.Width, textsize.Height);
-			core::rect<s32> bg_size(-2, 0, textsize.Width+2, textsize.Height);
+			core::rect<s32> bg_size(-2, 0, std::max(textsize.Width+2, (u32) nametag->images_dim.Width), textsize.Height + nametag->images_dim.Height);
 
 			auto bgcolor = nametag->getBgColor(m_show_nametag_backgrounds);
 			if (bgcolor.getAlpha() != 0)
@@ -724,15 +725,29 @@ void Camera::drawNametags()
 			font->draw(
 				translate_string(utf8_to_wide(nametag->text)).c_str(),
 				size + screen_pos, nametag->textcolor);
+
+			v2s32 image_pos(screen_pos);
+			image_pos.Y += textsize.Height;
+
+			const video::SColor color(255, 255, 255, 255);
+			const video::SColor colors[] = {color, color, color, color};
+
+			for (video::ITexture *texture : nametag->images) {
+				core::dimension2di imgsize(texture->getOriginalSize());
+				core::rect<s32> rect(core::position2d<s32>(0, 0), imgsize);
+				draw2DImageFilterScaled(driver, texture, rect + image_pos, rect, NULL, colors, true);
+				image_pos += core::dimension2di(imgsize.Width, 0);
+			}
+
 		}
 	}
 }
-
 Nametag *Camera::addNametag(scene::ISceneNode *parent_node,
 		const std::string &text, video::SColor textcolor,
-		Optional<video::SColor> bgcolor, const v3f &pos)
+		Optional<video::SColor> bgcolor, const v3f &pos,
+		const std::vector<std::string> &images)
 {
-	Nametag *nametag = new Nametag(parent_node, text, textcolor, bgcolor, pos);
+	Nametag *nametag = new Nametag(parent_node, text, textcolor, bgcolor, pos, m_client->tsrc(), images);
 	m_nametags.push_back(nametag);
 	return nametag;
 }

src/client/camera.h

@@ -39,18 +39,44 @@ struct Nametag
 	video::SColor textcolor;
 	Optional<video::SColor> bgcolor;
 	v3f pos;
+	ITextureSource *texture_source;
+	std::vector<video::ITexture *> images;
+	core::dimension2di images_dim;
 
 	Nametag(scene::ISceneNode *a_parent_node,
 			const std::string &text,
 			const video::SColor &textcolor,
 			const Optional<video::SColor> &bgcolor,
-			const v3f &pos):
+			const v3f &pos,
+			ITextureSource *tsrc,
+			const std::vector<std::string> &image_names):
 		parent_node(a_parent_node),
 		text(text),
 		textcolor(textcolor),
 		bgcolor(bgcolor),
-		pos(pos)
+		pos(pos),
+		texture_source(tsrc),
+		images(),
+		images_dim(0, 0)
 	{
+		setImages(image_names);
+	}
+
+	void setImages(const std::vector<std::string> &image_names)
+	{
+		images.clear();
+		images_dim = core::dimension2di(0, 0);
+
+		for (const std::string &image_name : image_names) {
+			video::ITexture *texture = texture_source->getTexture(image_name);
+			core::dimension2di imgsize(texture->getOriginalSize());
+
+			images_dim.Width += imgsize.Width;
+			if (images_dim.Height < imgsize.Height)
+				images_dim.Height = imgsize.Height;
+
+			images.push_back(texture);
+		}
 	}
 
 	video::SColor getBgColor(bool use_fallback) const
@@ -185,7 +211,8 @@ public:
 
 	Nametag *addNametag(scene::ISceneNode *parent_node,
 		const std::string &text, video::SColor textcolor,
-		Optional<video::SColor> bgcolor, const v3f &pos);
+		Optional<video::SColor> bgcolor, const v3f &pos,
+		const std::vector<std::string> &image_names);
 
 	void removeNametag(Nametag *nametag);
 

src/client/content_cao.cpp

@@ -962,13 +962,14 @@ void GenericCAO::updateNametag()
 		// Add nametag
 		m_nametag = m_client->getCamera()->addNametag(node,
 			m_prop.nametag, m_prop.nametag_color,
-			m_prop.nametag_bgcolor, pos);
+			m_prop.nametag_bgcolor, pos, nametag_images);
 	} else {
 		// Update nametag
 		m_nametag->text = m_prop.nametag;
 		m_nametag->textcolor = m_prop.nametag_color;
 		m_nametag->bgcolor = m_prop.nametag_bgcolor;
 		m_nametag->pos = pos;
+		m_nametag->setImages(nametag_images);
 	}
 }
 
@@ -1863,6 +1864,9 @@ void GenericCAO::processMessage(const std::string &data)
 			// Same as 'ObjectRef::l_remove'
 			if (!m_is_player)
 				clearChildAttachments();
+		} else {
+			if (m_client->modsLoaded())
+				m_client->getScript()->on_object_hp_change(m_id);
 		}
 	} else if (cmd == AO_CMD_UPDATE_ARMOR_GROUPS) {
 		m_armor_groups.clear();

src/client/content_cao.h

@@ -318,4 +318,6 @@ public:
 	void setProperties(ObjectProperties newprops);
 
 	void updateMeshCulling();
+
+	std::vector<std::string> nametag_images = {};
 };

src/client/hud.cpp

@@ -149,7 +149,7 @@ void Hud::drawItem(const ItemStack &item, const core::rect<s32>& rect,
 		bool selected)
 {
 	if (selected) {
-		/* draw hihlighting around selected item */
+		/* draw highlighting around selected item */
 		if (use_hotbar_selected_image) {
 			core::rect<s32> imgrect2 = rect;
 			imgrect2.UpperLeftCorner.X  -= (m_padding*2);

src/script/cpp_api/s_client.cpp

@@ -308,6 +308,21 @@ void ScriptApiClient::on_object_properties_change(s16 id)
 	runCallbacks(1, RUN_CALLBACKS_MODE_FIRST);
 }
 
+void ScriptApiClient::on_object_hp_change(s16 id)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.on_object_hp_change
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_object_hp_change");
+
+	// Push data
+	ClientObjectRef::create(L, id);
+
+	// Call functions
+	runCallbacks(1, RUN_CALLBACKS_MODE_FIRST);
+}
+
 bool ScriptApiClient::on_inventory_open(Inventory *inventory)
 {
 	SCRIPTAPI_PRECHECKHEADER

src/script/cpp_api/s_client.h

@@ -64,6 +64,7 @@ public:
 	bool on_play_sound(SimpleSoundSpec spec);
 	bool on_spawn_particle(struct ParticleParameters param);
 	void on_object_properties_change(s16 id);
+	void on_object_hp_change(s16 id);
 
 	bool on_inventory_open(Inventory *inventory);
 	void open_enderchest();

src/script/lua_api/l_clientobject.cpp

@@ -205,6 +205,23 @@ int ClientObjectRef::l_remove(lua_State *L)
 	return 0;
 }
 
+int ClientObjectRef::l_set_nametag_images(lua_State *L)
+{
+	ClientObjectRef *ref = checkobject(L, 1);
+	GenericCAO *gcao = get_generic_cao(ref, L);
+	gcao->nametag_images.clear();
+	if(lua_istable(L, 2)){
+		lua_pushnil(L);
+		while(lua_next(L, 2) != 0){
+			gcao->nametag_images.push_back(lua_tostring(L, -1));
+			lua_pop(L, 1);
+		}
+	}
+	gcao->updateNametag();
+
+	return 0;
+}
+
 ClientObjectRef::ClientObjectRef(ClientActiveObject *object) : m_object(object)
 {
 }
@@ -271,5 +288,7 @@ luaL_Reg ClientObjectRef::methods[] = {luamethod(ClientObjectRef, get_pos),
 		luamethod(ClientObjectRef, get_properties),
 		luamethod(ClientObjectRef, set_properties),
 		luamethod(ClientObjectRef, get_hp),
-		luamethod(ClientObjectRef, get_max_hp), luamethod(ClientObjectRef, punch),
-		luamethod(ClientObjectRef, rightclick), {0, 0}};
+		luamethod(ClientObjectRef, get_max_hp),
+		luamethod(ClientObjectRef, punch),
+		luamethod(ClientObjectRef, rightclick),
+		luamethod(ClientObjectRef, set_nametag_images), {0, 0}};

src/script/lua_api/l_clientobject.h

@@ -98,4 +98,7 @@ private:
 
 	// remove(self)
 	static int l_remove(lua_State *L);
+
+	// set_nametag_images(self, images)
+	static int l_set_nametag_images(lua_State *L);
 };