implement composter

build_registries.js

@@ -45,7 +45,8 @@ const blockWhitelist = [
   "moss_carpet",
   "oak_slab",
   "stone_slab",
-  "cobblestone_slab"
+  "cobblestone_slab",
+  "composter"
 ];
 
 // Currently, only 4 biome types are supported, excluding "beach"

include/procedures.h

@@ -29,6 +29,7 @@ uint8_t isInstantlyMined (PlayerData *player, uint8_t block);
 uint8_t isColumnBlock (uint8_t block);
 uint8_t isPassableBlock (uint8_t block);
 uint8_t isReplaceableBlock (uint8_t block);
+uint32_t isCompostItem (uint16_t item);
 
 uint16_t getMiningResult (uint16_t held_item, uint8_t block);
 void bumpToolDurability (PlayerData *player);

src/crafting.c

@@ -207,6 +207,24 @@ void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item) {
       }
       break;
 
+    case 7:
+      switch (first_item) {
+        case I_oak_slab:
+          if (
+            identical &&
+            player->craft_items[1] == 0 &&
+            player->craft_items[4] == 0
+          ) {
+            *item = I_composter;
+            *count = 1;
+            return;
+          }
+          break;
+
+        default: break;
+      }
+      break;
+
     case 8:
       switch (first_item) {
         case I_cobblestone:

src/packets.c

@@ -502,6 +502,23 @@ int cs_useItemOn (int client_fd) {
     } else if (target == B_furnace) {
       sc_openScreen(client_fd, 14, "Furnace", 7);
       return 0;
+    } else if (target == B_composter) {
+      // Check if the player is holding anything
+      uint8_t *count = &player->inventory_count[player->hotbar];
+      if (*count == 0) return 0;
+      // Check if the item is a valid compost item
+      uint16_t item = player->inventory_items[player->hotbar];
+      uint32_t compost_chance = isCompostItem(item);
+      if (compost_chance != 0) {
+        // Take away composted item
+        if ((*count -= 1) == 0) item = 0;
+        sc_setContainerSlot(client_fd, 0, serverSlotToClientSlot(0, player->hotbar), *count, item);
+        // Test compost chance and give bone meal on success
+        if (fast_rand() < compost_chance) {
+          givePlayerItem(player, I_bone_meal, 1);
+        }
+        return 0;
+      }
     }
   }
 

src/procedures.c

@@ -472,6 +472,34 @@ uint8_t isReplaceableBlock (uint8_t block) {
   );
 }
 
+// Checks whether the given item can be used in a composter
+// Returns the probability (out of 2^32) to return bone meal
+uint32_t isCompostItem (uint16_t item) {
+
+  // Output values calculated using the following formula:
+  // P = 2^32 / (7 / compost_chance)
+
+  if ( // Compost chance: 30%
+    item == I_oak_leaves ||
+    item == I_short_grass ||
+    item == I_wheat_seeds ||
+    item == I_oak_sapling ||
+    item == I_moss_carpet
+  ) return 184070026;
+
+  if ( // Compost chance: 50%
+    item == I_cactus ||
+    item == I_sugar_cane
+  ) return 306783378;
+
+  if ( // Compost chance: 65%
+    item == I_apple ||
+    item == I_lily_pad
+  ) return 398818392;
+
+  return 0;
+}
+
 void handlePlayerAction (PlayerData *player, int action, short x, short y, short z) {
 
   // In creative, only the "start mining" action is sent