implement furnaces and fix crafting

src/crafting.c

@@ -1,8 +1,10 @@
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #include "globals.h"
 #include "registries.h"
+#include "tools.h"
 #include "crafting.h"
 
 void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item) {
@@ -171,6 +173,19 @@ void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item) {
       }
       break;
 
+    case 8:
+      switch (first_item) {
+        case I_cobblestone:
+          if (player->craft_items[first + 4] == 0) {
+            *item = I_furnace;
+            *count = 1;
+            return;
+          }
+          break;
+
+        default: break;
+      }
+
     default: break;
 
   }
@@ -179,3 +194,49 @@ void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item) {
   *item = 0;
 
 }
+
+#define registerSmeltingRecipe(a, b) \
+  if (*material == a && (*output_item == b || *output_item == 0)) *output_item = b
+
+void getSmeltingOutput (PlayerData *player) {
+
+  uint8_t *material_count = &player->craft_count[0];
+  uint8_t *fuel_count = &player->craft_count[1];
+
+  if (*material_count == 0 || *fuel_count == 0) return;
+
+  uint16_t *material = &player->craft_items[0];
+  uint16_t *fuel = &player->craft_items[1];
+
+  uint8_t *output_count = &player->craft_count[2];
+  uint16_t *output_item = &player->craft_items[2];
+
+  uint8_t fuel_value;
+  if (*fuel == I_coal) fuel_value = 8;
+  else if (*fuel == I_charcoal) fuel_value = 8;
+  else if (*fuel == I_oak_planks) fuel_value = 1 + (fast_rand() & 1);
+  else if (*fuel == I_oak_log) fuel_value = 1 + (fast_rand() & 1);
+  else return;
+
+  uint8_t exchange = *material_count > fuel_value ? fuel_value : *material_count;
+
+  registerSmeltingRecipe(I_cobblestone, I_stone);
+  else registerSmeltingRecipe(I_oak_log, I_charcoal);
+  else registerSmeltingRecipe(I_raw_iron, I_iron_ingot);
+  else registerSmeltingRecipe(I_raw_gold, I_gold_ingot);
+  else return;
+
+  *output_count += exchange;
+  *material_count -= exchange;
+
+  *fuel_count -= 1;
+  if (*fuel_count == 0) *fuel = 0;
+
+  if (*material_count <= 0) {
+    *material_count = 0;
+    *material = 0;
+  } else return getSmeltingOutput(player);
+
+  return;
+
+}

src/crafting.h

@@ -6,5 +6,6 @@
 #include "globals.h"
 
 void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item);
+void getSmeltingOutput (PlayerData *player);
 
 #endif

src/globals.h

@@ -53,6 +53,7 @@ typedef struct {
   uint16_t inventory_items[41];
   uint16_t craft_items[9];
   uint8_t inventory_count[41];
+  uint8_t craft_count[9];
 } PlayerData;
 
 #pragma pack(pop)

src/packets.c

@@ -467,6 +467,9 @@ int cs_useItemOn (int client_fd) {
   if (target == B_crafting_table) {
     sc_openScreen(client_fd, 12, "Crafting", 8);
     return 0;
+  } else if (target == B_furnace) {
+    sc_openScreen(client_fd, 14, "Furnace", 7);
+    return 0;
   }
 
   PlayerData *player;
@@ -527,7 +530,7 @@ int cs_clickContainer (int client_fd) {
     if (!readByte(client_fd)) { // no item?
       if (slot != 255) {
         player->inventory_items[slot] = 0;
-        if (slot <= 40) player->inventory_count[slot] = 0;
+        player->inventory_count[slot] = 0;
       }
       continue;
     }
@@ -543,14 +546,30 @@ int cs_clickContainer (int client_fd) {
 
     if (count > 0) {
       player->inventory_items[slot] = item;
-      if (slot <= 40) player->inventory_count[slot] = count;
+      player->inventory_count[slot] = count;
     }
 
   }
 
-  if (craft) {
+  // window 0 is player inventory, window 12 is crafting table
+  if (craft && (window_id == 0 || window_id == 12)) {
     getCraftingOutput(player, &count, &item);
     sc_setContainerSlot(client_fd, window_id, 0, count, item);
+  } else if (window_id == 14) { // furnace
+    getSmeltingOutput(player);
+    for (int i = 0; i < 3; i ++) {
+      sc_setContainerSlot(client_fd, window_id, i, player->craft_count[i], player->craft_items[i]);
+    }
+  }
+
+  // read but ignore carried item slot (for now)
+  if (readByte(client_fd)) {
+    readVarInt(client_fd);
+    readVarInt(client_fd);
+    tmp = readVarInt(client_fd);
+    recv(client_fd, recv_buffer, tmp, MSG_WAITALL);
+    tmp = readVarInt(client_fd);
+    recv(client_fd, recv_buffer, tmp, MSG_WAITALL);
   }
 
   return 0;

src/tools.c

@@ -225,6 +225,14 @@ uint8_t clientSlotToServerSlot (int window_id, uint8_t slot) {
     // the rest of the slots are identical, just shifted by one
     if (slot >= 10 && slot <= 45) return clientSlotToServerSlot(0, slot - 1);
 
+  } else if (window_id == 14) { // furnace
+
+    // move furnace items to the player's crafting grid
+    // this lets us put them back in the inventory once the window closes
+    if (slot >= 0 && slot <= 2) return 41 + slot;
+    // the rest of the slots are identical, just shifted by 6
+    if (slot >= 3 && slot <= 38) return clientSlotToServerSlot(0, slot + 6);
+
   }
 
   return 255;