implement basic crafting

src/crafting.c

@@ -0,0 +1,84 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "globals.h"
+#include "registries.h"
+#include "crafting.h"
+
+void getCraftingOutput (PlayerData *player, uint8_t *count, uint16_t *item) {
+
+  uint8_t i, filled = 0, first = 10;
+  for (i = 0; i < 9; i ++) {
+    if (player->craft_items[i]) {
+      filled ++;
+      if (first == 10) first = i;
+    }
+  }
+
+  uint8_t first_col = first % 3, first_row = first / 3;
+
+  switch (filled) {
+
+    case 0:
+      *item = 0;
+      *count = 0;
+      return;
+
+    case 1:
+      switch (player->craft_items[first]) {
+        case I_oak_log:
+          *item = I_oak_planks;
+          *count = 4;
+          return;
+        case I_oak_planks:
+          *item = 715; // oak_button
+          *count = 1;
+          return;
+
+        default: break;
+      }
+      break;
+
+    case 2:
+      switch (player->craft_items[first]) {
+        case I_oak_planks:
+          if (first_col != 2 && player->craft_items[first + 1] == I_oak_planks) {
+            *item = 731; // oak_pressure_plate
+            *count = 1;
+            return;
+          } else if (first_row != 2 && player->craft_items[first + 3] == I_oak_planks) {
+            *item = I_stick;
+            *count = 4;
+            return;
+          }
+          break;
+
+        default: break;
+      }
+
+    case 4:
+      switch (player->craft_items[first]) {
+        case I_oak_planks:
+          if (
+            first_col != 2 && first_row != 2 &&
+            player->craft_items[first + 1] == I_oak_planks &&
+            player->craft_items[first + 3] == I_oak_planks &&
+            player->craft_items[first + 4] == I_oak_planks
+          ) {
+            *item = 320; // crafting_table
+            *count = 1;
+            return;
+          }
+          break;
+
+        default: break;
+      }
+
+    default: break;
+
+  }
+
+  *count = 0;
+  *item = 0;
+
+}