Interact

src/dusk/rpg/entity/CMakeLists.txt

@@ -8,7 +8,8 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
     entity.c
     entityanim.c
+    entitydir.c
+    entityinteract.c
     npc.c
     player.c
-    entitydir.c
 )

src/dusk/rpg/entity/entity.h

@@ -8,6 +8,7 @@
 #pragma once
 #include "entitydir.h"
 #include "entityanim.h"
+#include "entityinteract.h"
 #include "entitytype.h"
 #include "npc.h"
 
@@ -25,6 +26,8 @@ typedef struct entity_s {
 
   entityanim_t animation;
   fixed_t animTime;
+
+  entityinteract_t interact;
 } entity_t;
 
 extern entity_t ENTITIES[ENTITY_COUNT];

src/dusk/rpg/entity/entityanim.h

@@ -9,7 +9,7 @@
 #include "dusk.h"
 #include "util/fixed.h"
 
-#define ENTITY_ANIM_TURN_DURATION FIXED(0.12f)
+#define ENTITY_ANIM_TURN_DURATION FIXED(0.06f)
 #define ENTITY_ANIM_WALK_DURATION FIXED(0.1f)
 
 typedef struct entity_s entity_t;

src/dusk/rpg/entity/entityinteract.c

@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "entity.h"
+#include "assert/assert.h"
+#include "console/console.h"
+#include "rpg/cutscene/cutscenesystem.h"
+
+void entityInteractWith(entity_t *player, entity_t *target) {
+  assertNotNull(player, "Player entity pointer cannot be NULL");
+  assertNotNull(target, "Target entity pointer cannot be NULL");
+
+  switch(target->interact.type) {
+    case ENTITY_INTERACT_CUTSCENE:
+      assertNotNull(
+        target->interact.data.cutscene,
+        "Interact cutscene pointer cannot be NULL"
+      );
+      cutsceneSystemStartCutscene(target->interact.data.cutscene);
+      return;
+
+    case ENTITY_INTERACT_PRINT:
+      consolePrint(target->interact.data.message);
+      return;
+
+    case ENTITY_INTERACT_NULL:
+      break;
+
+    default:
+      assertUnreachable("Unknown entity interact type");
+      break;
+  }
+
+  if(ENTITY_CALLBACKS[target->type].interact == NULL) return;
+  ENTITY_CALLBACKS[target->type].interact(player, target);
+}

src/dusk/rpg/entity/entityinteract.h

@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "dusk.h"
+#include "rpg/cutscene/cutscene.h"
+
+typedef struct entity_s entity_t;
+
+/**
+ * Describes the type of interaction an entity supports.
+ */
+typedef enum {
+  ENTITY_INTERACT_NULL = 0,
+  ENTITY_INTERACT_CUTSCENE,
+  ENTITY_INTERACT_PRINT,
+  ENTITY_INTERACT_COUNT
+} entityinteracttype_t;
+
+/**
+ * Per-type data for an entity's interact component.
+ */
+typedef union {
+  const cutscene_t *cutscene;
+  char_t message[32];
+} entityinteractdata_t;
+
+/**
+ * Interact component attached to any entity that can be interacted with.
+ * Set type to ENTITY_INTERACT_NULL to mark the entity as non-interactable.
+ */
+typedef struct {
+  entityinteracttype_t type;
+  entityinteractdata_t data;
+} entityinteract_t;
+
+/**
+ * Attempts to interact with the target entity on behalf of the player.
+ * Dispatches via the interact component; falls back to the entity type
+ * callback if no component is set.
+ *
+ * @param player Pointer to the player entity.
+ * @param target Pointer to the entity to interact with.
+ */
+void entityInteractWith(entity_t *player, entity_t *target);

src/dusk/rpg/entity/player.c

@@ -43,12 +43,11 @@ void playerInput(entity_t *entity) {
     worldunits_t relX, relY;
     entityDirGetRelative(entity->direction, &relX, &relY);
     worldpos_t cur = fixedToWorldPos(entity->position);
-    entity_t *interact = entityGetAt(
+    entity_t *target = entityGetAt(
       (worldpos_t){ cur.x + relX, cur.y + relY, cur.z }
     );
-    if(interact != NULL && ENTITY_CALLBACKS[interact->type].interact != NULL) {
+    if(target == NULL) return;
-      if(ENTITY_CALLBACKS[interact->type].interact(entity, interact)) return;
+    entityInteractWith(entity, target);
-    }
   }
   
 }

src/dusk/rpg/rpg.c

@@ -13,6 +13,7 @@
 #include "rpgcamera.h"
 #include "rpgtextbox.h"
 #include "util/memory.h"
+#include "util/string.h"
 #include "assert/assert.h"
 
 errorret_t rpgInit(void) {
@@ -43,6 +44,8 @@ errorret_t rpgInit(void) {
   entity_t *npc = &ENTITIES[npcIndex];
   entityInit(npc, ENTITY_TYPE_NPC);
   worldPosToFixed(&(worldpos_t){ 3, 3, 0 }, npc->position);
+  npc->interact.type = ENTITY_INTERACT_PRINT;
+  stringCopy(npc->interact.data.message, "hello world", 32);
 
   // All Good!
   errorOk();