make fire drop ash, add ash block

src/content_craftitem.cpp

@@ -395,4 +395,11 @@ void content_craftitem_init()
 		crafting::setRecipe(recipe,CONTENT_CRAFTITEM_TNT,1);
 	}
 
+	i = CONTENT_CRAFTITEM_ASH;
+	f = &g_content_craftitem_features[i];
+	f->content = CONTENT_CRAFTITEM_ASH;
+	f->texture = "lump_of_ash.png";
+	f->name = "lump_of_ash";
+	f->gui_name = "Ash";
+
 }

src/content_craftitem.h

@@ -78,5 +78,6 @@ CraftItemFeatures & content_craftitem_features(std::string subname);
 #define CONTENT_CRAFTITEM_WOOD_PLANK (CONTENT_CRAFTITEM_MASK | 0x27)
 #define CONTENT_CRAFTITEM_JUNGLE_PLANK (CONTENT_CRAFTITEM_MASK | 0x28)
 #define CONTENT_CRAFTITEM_TNT (CONTENT_CRAFTITEM_MASK | 0x29)
+#define CONTENT_CRAFTITEM_ASH (CONTENT_CRAFTITEM_MASK | 0x2A)
 
 #endif

src/content_mapnode.cpp

@@ -1108,6 +1108,17 @@ void content_mapnode_init()
 	f->dug_item = std::string("MaterialItem2 ")+itos(i)+" 1";
 	setDirtLikeDiggingProperties(f->digging_properties, 1.0);
 
+	i = CONTENT_ASH;
+	f = &content_features(i);
+	f->description = std::string("Ash Block");
+	f->setAllTextures("ash.png");
+	f->setInventoryTextureCube("ash.png", "ash.png", "ash.png");
+	f->draw_type = CDT_CUBELIKE;
+	f->is_ground_content = true;
+	f->dug_item = std::string("CraftItem lump_of_ash 9");
+	setDirtLikeDiggingProperties(f->digging_properties, 0.5);
+	crafting::setHardBlockRecipe(CONTENT_CRAFTITEM_ASH,CONTENT_ASH);
+
 	i = CONTENT_SAND;
 	f = &content_features(i);
 	f->description = std::string("Sand");

src/content_mapnode.h

@@ -178,7 +178,8 @@ MapNode mapnode_translate_to_internal(MapNode n_from, u8 version);
 #define CONTENT_ROUGHSTONEBLOCK 0x8CD
 #define CONTENT_STEAM 0x8CE
 #define CONTENT_INCINERATOR 0x8CF
-// FREE 8D0-8FF
+#define CONTENT_ASH 0x8D0
+// FREE 8D1-8FF
 // glass pane
 #define CONTENT_GLASS_PANE 0x900
 #define CONTENT_GLASS_PANE_BLUE 0x901

src/environment.cpp

@@ -1362,14 +1362,22 @@ void ServerEnvironment::step(float dtime)
 					fire that goes out
 				*/
 				if (n.getContent() == CONTENT_FIRE_SHORTTERM) {
-					if (myrand()%10 == 0)
+					if (myrand()%10 == 0) {
 						m_map->removeNodeWithEvent(p);
+						v3f ash_pos = intToFloat(p, BS);
+						ash_pos += v3f(myrand_range(-1500,1500)*1.0/1000, 0, myrand_range(-1500,1500)*1.0/1000);
+						ServerActiveObject *obj = new ItemSAO(this, 0, ash_pos, "CraftItem lump_of_ash 1");
+						addActiveObject(obj);
+					}
 				}
 				/*
 					fire that spreads just a little
 				*/
 				if (n.getContent() == CONTENT_FIRE) {
-					if (myrand()%10) {
+					MapNode n_below = m_map->getNodeNoEx(p+v3s16(0,-1,0));
+					if (!content_features(n_below).flammable) {
+						m_map->removeNodeWithEvent(p);
+					}else if (myrand()%10) {
 						bool can_spread = true;
 						s16 bs_rad = g_settings->getS16("borderstone_radius");
 						bs_rad += 2;