Item entity

cmake/targets/linux.cmake

@@ -36,7 +36,7 @@ target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
   # DUSK_OPENGL_LEGACY
   DUSK_LINUX
   DUSK_DISPLAY_SIZE_DYNAMIC
-  DUSK_DISPLAY_WIDTH_DEFAULT=640
+  DUSK_DISPLAY_WIDTH_DEFAULT=854
   DUSK_DISPLAY_HEIGHT_DEFAULT=480
   DUSK_DISPLAY_SCREEN_HEIGHT=240
   DUSK_INPUT_KEYBOARD

src/dusk/rpg/cutscene/item/item/cutsceneitemgive.c

@@ -6,25 +6,14 @@
  */
 
 #include "rpg/cutscene/item/cutsceneitem.h"
-#include "rpg/item/backpack.h"
+#include "rpg/item/itemgive.h"
 #include "ui/rpg/uitextboxmain.h"
-#include "util/string.h"
 
 void cutsceneItemGiveStart(
   const cutsceneitem_t *item,
   cutsceneitemdata_t *data
 ) {
-  backpackAdd(item->itemGive.item, item->itemGive.quantity);
-
-  char_t msg[CUTSCENE_TEXT_MAX_CHARS];
-  stringFormat(
-    msg,
-    CUTSCENE_TEXT_MAX_CHARS - 1,
-    "Received %s x%u",
-    ITEMS[item->itemGive.item].name,
-    (uint32_t)item->itemGive.quantity
-  );
-  uiTextboxMainSetText(msg);
+  itemGive(item->itemGive.item, item->itemGive.quantity);
 }
 
 bool_t cutsceneItemGiveUpdate(

src/dusk/rpg/entity/CMakeLists.txt

@@ -15,4 +15,5 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
 add_subdirectory(anim)
 add_subdirectory(interact)
 add_subdirectory(npc)
+add_subdirectory(item)
 add_subdirectory(global)

src/dusk/rpg/entity/entitytype.h

@@ -8,12 +8,14 @@
 #pragma once
 #include "rpg/entity/player.h"
 #include "npc/npc.h"
+#include "item/entityitem.h"
 
 typedef enum {
   ENTITY_TYPE_NULL,
-  
+
   ENTITY_TYPE_PLAYER,
   ENTITY_TYPE_NPC,
+  ENTITY_TYPE_ITEM,
 
   ENTITY_TYPE_COUNT
 } entitytype_enum_t;
@@ -23,6 +25,7 @@ typedef uint8_t entitytype_t;
 typedef union {
   player_t player;
   npc_t npc;
+  entityitem_t item;
 } entitytypedata_t;
 
 typedef struct {
@@ -50,5 +53,10 @@ static const entitycallback_t ENTITY_CALLBACKS[ENTITY_TYPE_COUNT] = {
   [ENTITY_TYPE_NPC] = {
     .init = npcInit,
     .movement = npcMovement,
+  },
+
+  [ENTITY_TYPE_ITEM] = {
+    .init = entityItemInit,
+    .movement = entityItemMovement,
   }
 };

src/dusk/rpg/entity/interact/entityinteract.c

@@ -40,6 +40,14 @@ void entityInteractWith(entity_t *player, entity_t *target) {
       // entityTurn(player, player->direction); // Redundant (for now)
       break;
 
+    case ENTITY_INTERACT_CALLBACK:
+      assertNotNull(
+        target->interact.data.callback,
+        "Interact callback pointer cannot be NULL"
+      );
+      target->interact.data.callback(player, target);
+      break;
+
     case ENTITY_INTERACT_NULL:
       break;
 

src/dusk/rpg/entity/item/CMakeLists.txt

@@ -0,0 +1,10 @@
+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
+    entityitem.c
+)

src/dusk/rpg/entity/item/entityitem.c

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "entityitem.h"
+#include "rpg/entity/entity.h"
+#include "assert/assert.h"
+#include "rpg/item/itemgive.h"
+#include "ui/rpg/uitextboxmain.h"
+
+void entityItemInit(entity_t *entity) {
+  assertNotNull(entity, "Entity pointer cannot be NULL");
+  entity->interact.type = ENTITY_INTERACT_CALLBACK;
+  entity->interact.data.callback = entityItemInteract;
+}
+
+void entityItemSet(
+  entity_t *entity,
+  const itemid_t item,
+  const uint8_t quantity
+) {
+  assertNotNull(entity, "Entity pointer cannot be NULL");
+  entity->data.item.item = item;
+  entity->data.item.quantity = quantity;
+}
+
+void entityItemInteract(entity_t *player, entity_t *target) {
+  assertNotNull(player, "Player entity pointer cannot be NULL");
+  assertNotNull(target, "Target entity pointer cannot be NULL");
+
+  itemGive(target->data.item.item, target->data.item.quantity);
+  target->data.item.collected = true;
+}
+
+void entityItemMovement(entity_t *entity) {
+  assertNotNull(entity, "Entity pointer cannot be NULL");
+  if(!entity->data.item.collected) return;
+  if(uiTextboxMainIsActive()) return;
+
+  entity->type = ENTITY_TYPE_NULL;
+}

src/dusk/rpg/entity/item/entityitem.h

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "rpg/item/item.h"
+
+typedef struct entity_s entity_t;
+
+typedef struct {
+  itemid_t item;
+  uint8_t quantity;
+  bool_t collected;
+} entityitem_t;
+
+/**
+ * Initializes an item entity. Wires up the interact component so that
+ * interacting with the entity gives its item and removes it.
+ *
+ * @param entity Pointer to the entity structure to initialize.
+ */
+void entityItemInit(entity_t *entity);
+
+/**
+ * Sets the item and quantity represented by an item entity.
+ *
+ * @param entity Pointer to the entity structure.
+ * @param item The item ID to give when picked up.
+ * @param quantity The quantity to give when picked up.
+ */
+void entityItemSet(
+  entity_t *entity,
+  const itemid_t item,
+  const uint8_t quantity
+);
+
+/**
+ * Interact callback for item entities. Gives the entity's item to the
+ * player and shows the pickup message. The entity itself is removed once
+ * the message has been dismissed, via entityItemMovement.
+ *
+ * @param player Pointer to the player entity.
+ * @param target Pointer to the item entity being picked up.
+ */
+void entityItemInteract(entity_t *player, entity_t *target);
+
+/**
+ * Update callback for item entities. Removes the entity once its pickup
+ * message has been dismissed. No-op if the item hasn't been collected.
+ *
+ * @param entity Pointer to the entity structure to update.
+ */
+void entityItemMovement(entity_t *entity);

src/dusk/rpg/item/CMakeLists.txt

@@ -8,6 +8,7 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
     inventory.c
     backpack.c
+    itemgive.c
 )
 
 # Item Definitions

src/dusk/rpg/item/itemgive.c

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "itemgive.h"
+#include "rpg/item/backpack.h"
+#include "ui/rpg/uitextboxmain.h"
+#include "util/string.h"
+
+void itemGive(const itemid_t item, const uint8_t quantity) {
+  backpackAdd(item, quantity);
+
+  char_t msg[ITEM_GIVE_MESSAGE_MAX_CHARS];
+  stringFormat(
+    msg,
+    ITEM_GIVE_MESSAGE_MAX_CHARS - 1,
+    "Received %s x%u",
+    ITEMS[item].name,
+    (uint32_t)quantity
+  );
+  uiTextboxMainSetText(msg);
+}

src/dusk/rpg/item/itemgive.h

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "rpg/item/item.h"
+
+#define ITEM_GIVE_MESSAGE_MAX_CHARS 256
+
+/**
+ * Adds a quantity of an item to the player's backpack and shows a
+ * "Received <item> x<quantity>" message in the main textbox.
+ *
+ * @param item The item ID to give.
+ * @param quantity The quantity to give.
+ */
+void itemGive(const itemid_t item, const uint8_t quantity);

src/dusk/rpg/rpg.c

@@ -8,6 +8,7 @@
 #include "rpg.h"
 #include "entity/entity.h"
 #include "rpg/entity/npc/npcpath.h"
+#include "rpg/entity/item/entityitem.h"
 #include "rpg/overworld/map.h"
 #include "rpg/overworld/maparea.h"
 #include "rpg/cutscene/cutscenesystem.h"
@@ -48,6 +49,14 @@ errorret_t rpgInit(void) {
 
   mapSpawnEntity(3, (worldpos_t){ 8, 8, 1 });
 
+  // TEST: Place an item entity.
+  uint8_t itemEntIndex = entityGetAvailable();
+  assertTrue(itemEntIndex != 0xFF, "No available entity slots!.");
+  entity_t *itemEnt = &ENTITIES[itemEntIndex];
+  entityInit(itemEnt, ENTITY_TYPE_ITEM);
+  entityItemSet(itemEnt, ITEM_ID_POTION, 1);
+  entityPositionSet(itemEnt, (worldpos_t){ 12, 2, 0 });
+
   // TEST: Create a test map area.
   uint8_t areaIndex = mapAreaAdd(
     (worldpos_t){ 11, 3, 0 },