add item 'uses-display' property

src/content/ContentLoader.cpp

@@ -438,6 +438,18 @@ void ContentLoader::loadItem(
     root.at("stack-size").get(def.stackSize);
     root.at("uses").get(def.uses);
 
+    std::string usesDisplayStr = "";
+    root.at("uses-display").get(usesDisplayStr);
+    if (usesDisplayStr == "none") {
+        def.usesDisplay = ItemUsesDisplay::NONE;
+    } else if (usesDisplayStr == "relation") {
+        def.usesDisplay = ItemUsesDisplay::RELATION;
+    } else if (usesDisplayStr == "vbar") {
+        def.usesDisplay = ItemUsesDisplay::VBAR;
+    } else if (usesDisplayStr.length()) {
+        logger.error() << name << ": unknown uses display mode " << usesDisplayStr;
+    }
+
     if (auto found = root.at("emission")) {
         const auto& emissionarr = *found;
         def.emission[0] = emissionarr[0].asNumber();

src/graphics/ui/elements/InventoryView.cpp

@@ -234,19 +234,38 @@ void SlotView::drawItemInfo(
         if (!ptr->isInteger()) {
             return;
         }
-        {
-            std::wstring text = std::to_wstring(ptr->asInteger());
-            batch.setColor({0, 0, 0, 1.0f});
-            font.draw(batch, text, pos.x - 2, pos.y - 2, nullptr, 0);
-            batch.resetColor();
-            font.draw(batch, text, pos.x - 3, pos.y - 3, nullptr, 0);
-        }
-        {
-            std::wstring text = std::to_wstring(item.uses);
-            batch.setColor({0, 0, 0, 1.0f});
-            font.draw(batch, text, pos.x - 2, pos.y - 2 + 12, nullptr, 0);
-            batch.resetColor();
-            font.draw(batch, text, pos.x - 3, pos.y - 3 + 12, nullptr, 0);
+        int16_t uses = ptr->asInteger();
+        switch (item.usesDisplay) {
+            case ItemUsesDisplay::NONE:
+                break;
+            case ItemUsesDisplay::RELATION:
+                {
+                    std::wstring text = std::to_wstring(uses);
+                    batch.setColor({0, 0, 0, 1.0f});
+                    font.draw(batch, text, pos.x - 2, pos.y - 2, nullptr, 0);
+                    batch.resetColor();
+                    font.draw(batch, text, pos.x - 3, pos.y - 3, nullptr, 0);
+                }
+                {
+                    std::wstring text = std::to_wstring(item.uses);
+                    batch.setColor({0, 0, 0, 1.0f});
+                    font.draw(batch, text, pos.x - 2, pos.y - 2 + 12, nullptr, 0);
+                    batch.resetColor();
+                    font.draw(batch, text, pos.x - 3, pos.y - 3 + 12, nullptr, 0);
+                }
+                break;
+            case ItemUsesDisplay::VBAR: {
+                batch.untexture();
+                batch.setColor({0, 0, 0, 0.75f});
+                batch.rect(pos.x - 2, pos.y - 2, 6, SLOT_SIZE + 4);
+                float t = static_cast<float>(uses) / item.uses;
+
+                batch.setColor({(1.0f - t * 0.8f), 0.4f, t * 0.8f + 0.2f, 1.0f});
+                
+                int height = SLOT_SIZE * t;
+                batch.rect(pos.x, pos.y + SLOT_SIZE - height, 2, height);
+                break;
+            }
         }
     }
 }

src/items/ItemDef.cpp

@@ -15,4 +15,6 @@ void ItemDef::cloneTo(ItemDef& dst) {
     dst.placingBlock = placingBlock;
     dst.scriptName = scriptName;
     dst.modelName = modelName;
+    dst.uses = uses;
+    dst.usesDisplay = usesDisplay;
 }

src/items/ItemDef.hpp

@@ -19,6 +19,13 @@ enum class ItemIconType {
     BLOCK,   // block preview: icon is string block id
 };
 
+enum class ItemUsesDisplay {
+    NONE,     // uses count is not displayed
+    RELATION, // uses count is displayed as `remain/default` relation
+    VBAR,     // uses count is displayed as vertical bar without counter
+    DEFAULT = VBAR,
+};
+
 struct ItemDef {
     /// @brief Item string id (with prefix included)
     std::string const name;
@@ -40,6 +47,9 @@ struct ItemDef {
     /// @brief Default item uses count
     int16_t uses = -1;
 
+    /// @brief Item uses count display mode
+    ItemUsesDisplay usesDisplay = ItemUsesDisplay::DEFAULT;
+
     ItemIconType iconType = ItemIconType::SPRITE;
     std::string icon = "blocks:notfound";