Basic ECS

src/dusk/engine/engine.c

@@ -19,9 +19,6 @@
 #include "entity/entitymanager.h"
 #include "game/game.h"
 
-#include "entity/component/display/entityposition.h"
-#include "entity/component/display/entitycamera.h"
-
 engine_t ENGINE;
 
 errorret_t engineInit(const int32_t argc, const char_t **argv) {
@@ -42,12 +39,14 @@ errorret_t engineInit(const int32_t argc, const char_t **argv) {
   entityManagerInit();
   errorChain(gameInit());
 
-  entityid_t ent0 = entityAdd();
-  entityAddComponent(ent0, ENTITY_POSITION_DATA);
-  entityAddComponent(ent0, ENTITY_CAMERA_DATA);
+  // FOF
+  entityid_t ent0 = entityManagerAdd();
+  componentid_t ent0c0 = entityAddComponent(ent0, COMPONENT_TYPE_POSITION);
 
-  entityid_t ent1 = entityAdd();
-  entityAddComponent(ent0, ENTITY_POSITION_DATA);
+  entityid_t ent1 = entityManagerAdd();
+
+  entityid_t ent2 = entityManagerAdd();
+  // EOF
 
   // Run the init script.
   scriptcontext_t ctx;

src/dusk/entity/CMakeLists.txt

@@ -7,9 +7,9 @@
 target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
     entity.c
-    entitycomponent.c
     entitymanager.c
+    component.c
 )
 
-# Subdirectories
+# Subdirs
 add_subdirectory(component)

src/dusk/entity/component.c

@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "entitymanager.h"
+#include "assert/assert.h"
+#include "util/memory.h"
+
+componentdefinition_t COMPONENT_DEFINITIONS[] = {
+  [COMPONENT_TYPE_NULL] = { 0 },
+
+  #define X(enumName, type, field, iMethod, dMethod) \
+    [COMPONENT_TYPE_##enumName] = { .init = iMethod, .dispose = dMethod },
+  #include "componentlist.h"
+  #undef X
+
+  [COMPONENT_TYPE_COUNT] = { 0 }
+};
+
+void componentInit(
+  const entityid_t entityId,
+  const componentid_t componentId,
+  const componenttype_t type
+) {
+  assertTrue(entityId < ENTITY_COUNT_MAX, "Entity ID OOB");
+  assertTrue(componentId < ENTITY_COMPONENT_COUNT_MAX, "Component ID OOB");
+  assertTrue(type < COMPONENT_TYPE_COUNT, "Component type OOB");
+  assertTrue(type != COMPONENT_TYPE_NULL, "Cannot initialize null component");
+  
+  component_t *cmp = &ENTITY_MANAGER.entities[entityId].components[componentId];
+  memoryZero(cmp, sizeof(component_t));
+
+  cmp->type = type;
+  if(COMPONENT_DEFINITIONS[type].init) {
+    COMPONENT_DEFINITIONS[type].init(entityId, componentId);
+  }
+}
+
+void * componentGetData(
+  const entityid_t entityId,
+  const componentid_t componentId
+) {
+  assertTrue(entityId < ENTITY_COUNT_MAX, "Entity ID OOB");
+  assertTrue(componentId < ENTITY_COMPONENT_COUNT_MAX, "Component ID OOB");
+  
+  component_t *cmp = &ENTITY_MANAGER.entities[entityId].components[componentId];
+  if(cmp->type == COMPONENT_TYPE_NULL) return NULL;
+
+  return &cmp->data;
+}
+
+void componentDispose(
+  const entityid_t entityId,
+  const componentid_t componentId
+) {
+  assertTrue(entityId < ENTITY_COUNT_MAX, "Entity ID OOB");
+  assertTrue(componentId < ENTITY_COMPONENT_COUNT_MAX, "Component ID OOB");
+  
+  component_t *cmp = &ENTITY_MANAGER.entities[entityId].components[componentId];
+  if(cmp->type == COMPONENT_TYPE_NULL) return;
+
+  if(COMPONENT_DEFINITIONS[cmp->type].dispose) {
+    COMPONENT_DEFINITIONS[cmp->type].dispose(entityId, componentId);
+  }
+  
+  cmp->type = COMPONENT_TYPE_NULL;
+}

src/dusk/entity/component.h

@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "entitybase.h"
+
+#define X(enumName, type, field, init, dispose) \
+  // do nothing
+#include "componentlist.h"
+#undef X
+
+typedef union {
+  #define X(enumName, type, field, init, dispose) type field;
+  #include "componentlist.h"
+  #undef X
+} componentdata_t;
+
+typedef struct {
+  void (*init)(const entityid_t, const componentid_t);
+  void (*dispose)(const entityid_t, const componentid_t);
+} componentdefinition_t;
+
+typedef enum {
+  COMPONENT_TYPE_NULL,
+
+  #define X(enumName, type, field, init, dispose) \
+    COMPONENT_TYPE_##enumName,
+  #include "componentlist.h"
+  #undef X
+
+  COMPONENT_TYPE_COUNT
+} componenttype_t;
+
+typedef struct {
+  componenttype_t type;
+  componentdata_t data;
+} component_t;
+
+extern componentdefinition_t COMPONENT_DEFINITIONS[];
+
+/**
+ * Initializes a component of the given type for the entity with component ID.
+ * 
+ * @param entityId The entity ID.
+ * @param componentId The component ID.
+ * @param type The type of the component to initialize.
+ */
+void componentInit(
+  const entityid_t entityId,
+  const componentid_t componentId,
+  const componenttype_t type
+);
+
+/**
+ * Gets the pointer to the data of a component for the entity with component ID.
+ * 
+ * @param entityId The entity ID.
+ * @param componentId The component ID.
+ * @return A pointer to the component data.
+ */
+void * componentGetData(
+  const entityid_t entityId,
+  const componentid_t componentId
+);
+
+/**
+ * Disposes of a component for the entity with component ID.
+ * 
+ * @param entityId The entity ID.
+ * @param componentId The component ID.
+ */
+void componentDispose(
+  const entityid_t entityId,
+  const componentid_t componentId
+);

src/dusk/entity/component/CMakeLists.txt

@@ -6,7 +6,5 @@
 # Sources
 target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
+    entityposition.c
 )
-
-# Subdirectories
-add_subdirectory(display)

src/dusk/entity/component/display/CMakeLists.txt

@@ -1,12 +0,0 @@
-# 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
-    entityposition.c
-)
-
-# Subdirectories

src/dusk/entity/component/display/entitycamera.c

@@ -1,20 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#include "entitycamera.h"
-
-ENTITY_COMPONENT_DEFINE(entitycamera_t, entityCameraInit, NULL)
-
-void entityCameraInit(const entityandentitycomponentid_t id) {
-  entityid_t entityId = 
-
-  // Default to perspective camera with default values.
-  data->projType = CAMERA_PROJECTION_TYPE_PERSPECTIVE;
-  data->perspective.fov = glm_rad(45.0f);
-  data->nearClip = 0.1f;
-  data->farClip = 10000.0f;
-}

src/dusk/entity/component/display/entitycamera.h

@@ -1,39 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#pragma once
-#include "entity/entitymanager.h"
-#include "display/camera/camera.h"
-
-#define ENTITY_CAMERA_COUNT_MAX 2
-
-typedef struct {
-  union {
-    struct {
-      float_t fov;
-    } perspective;
-
-    struct {
-      float_t left;
-      float_t right;
-      float_t top;
-      float_t bottom;
-    } orthographic;
-  };
-  
-  float_t nearClip;
-  float_t farClip;
-  
-  cameraprojectiontype_t projType;
-} entitycamera_t;
-
-/**
- * Initializes the camera component for an entity.
- * 
- * @param id The component entity id.
- */
-void entityCameraInit(const entityandentitycomponentid_t id);

src/dusk/entity/component/display/entityposition.c

@@ -1,26 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#include "entityposition.h"
-#include "util/memory.h"
-
-entityposition_t ENTITY_POSITION_DATA[ENTITY_COUNT_MAX];
-
-void entityPositionInit(const entityid_t id, entityposition_t *data) {
-  memoryZero(data, sizeof(entityposition_t));
-
-  glm_mat4_identity(data->transform);
-}
-
-void entityPositionLookAt(
-  const entityid_t id,
-  const vec3 target,
-  const vec3 up,
-  const vec3 eye
-) {
-  glm_lookat(eye, target, up, ENTITY_POSITION_DATA[id].transform);
-}

src/dusk/entity/component/display/entityposition.h

@@ -1,35 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#pragma once
-#include "entity/entity.h"
-
-typedef struct {
-  mat4 transform;
-} entityposition_t;
-
-/**
- * Initializes the position component for an entity.
- * 
- * @param id The component entity id.
- */
-void entityPositionInit(const entityandentitycomponentid_t id);
-
-/**
- * Sets the position component of an entity to look at a target point.
- * 
- * @param id The component entity id.
- * @param target The target point to look at.
- * @param up The up vector to use for the look at calculation.
- * @param eye The eye position to use for the look at calculation.
- */
-void entityPositionLookAt(
-  const entityandentitycomponentid_t id,
-  const vec3 target,
-  const vec3 up,
-  const vec3 eye
-);

src/dusk/entity/component/entityposition.c

@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "entity/entitymanager.h"
+
+void entityPositionInit(
+  const entityid_t entityId,
+  const componentid_t componentId
+) {
+  entityposition_t *pos = componentGetData(entityId, componentId);
+
+  glm_mat4_identity(pos->transform);
+}

src/dusk/entity/component/entityposition.h

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "entity/entitybase.h"
+
+typedef struct {
+  mat4 transform;
+} entityposition_t;
+
+/**
+ * Initialize the entity position component.
+ * 
+ * @param entityId The entity ID.
+ * @param componentId The component ID.
+ */
+void entityPositionInit(
+  const entityid_t entityId,
+  const componentid_t componentId
+);

src/dusk/entity/componentlist.h

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "entity/component/entityposition.h"
+
+X(POSITION, entityposition_t, position, entityPositionInit, NULL)

src/dusk/entity/entity.c

@@ -9,98 +9,37 @@
 #include "util/memory.h"
 #include "assert/assert.h"
 
-entityid_t entityAdd() {
-  entityid_t id = 0xFF;
+void entityInit(const entityid_t entityId) {
+  entity_t *ent = &ENTITY_MANAGER.entities[entityId];
   
-  // Quick search for an available slot.
-  for(uint8_t i = 0; i < ENTITY_COUNT_MAX; i++) {
-    if((ENTITY_MANAGER.entities[i].state & ENTITY_STATE_ACTIVE) != 0) {
-      continue;
-    }
+  memoryZero(ent, sizeof(entity_t));
 
-    id = i;
-    break;
-  }
-
-  if(id >= ENTITY_COUNT_MAX) {
-    assertUnreachable("No available entity slots.");
-    return 0xFF;
-  }
-
-  // Init the entity.
-  entity_t *entity = &ENTITY_MANAGER.entities[id];
-  memoryZero(entity, sizeof(entity_t));
-  entity->state |= ENTITY_STATE_ACTIVE;
-  return id;
+  ent->state |= ENTITY_STATE_ACTIVE;
 }
 
-entitycomponentid_t entityAddComponent(
-  const entityid_t id,
-  void *componentData
+componentid_t entityAddComponent(
+  const entityid_t entityId,
+  const componenttype_t type
 ) {
-  entitycomponentid_t compId = entityComponentGetByData(componentData);
-  assertTrue(compId != 0xFF, "Component not found in entity manager.");
+  entity_t *ent = &ENTITY_MANAGER.entities[entityId];
 
-  // Find empty entity slot.
-  entitycomponent_t *comp = &ENTITY_MANAGER.components[compId];
-  uint8_t x = 0xFF;// Entity slot within the component
-  for(uint8_t i = 0; i < comp->entityMax; i++) {
-    if(comp->entities[i] != 0xFF) {
-      continue;
+  for(componentid_t i = 0; i < ENTITY_COMPONENT_COUNT_MAX; i++) {
+    if(ent->components[i].type != COMPONENT_TYPE_NULL) continue;
+    componentInit(entityId, i, type);
+    return i;
   }
-    x = i;
-    break;
-  }
-  assertTrue(x != 0xFF, "No available component entity slots.");
 
-  // Set the entity id.
-  entity_t *entity = &ENTITY_MANAGER.entities[id];
-  assertTrue(
-    entity->componentCount < ENTITY_COMPONENT_COUNT_MAX,
-    "Entity has too many components."
-  );
-  comp->entities[x] = id;
-  entity->components[entity->componentCount++] = compId;
-
-  if(comp->init != NULL) {
-    void *data = (uint8_t *)comp->data + (comp->dataSize * x);
-    comp->init(id, data);
-  }
-  return id;
+  assertUnreachable("Entity has no more component slots available");
+  return 0xFF;
 }
 
-void entityRemove(const entityid_t id) {
-  assertTrue(id < ENTITY_COUNT_MAX, "Invalid entity ID.");
+void entityDispose(const entityid_t entityId) {
+  entity_t *ent = &ENTITY_MANAGER.entities[entityId];
 
-  entity_t *entity = &ENTITY_MANAGER.entities[id];
-  entity->state &= ~ENTITY_STATE_ACTIVE;
-
-  // Remove components.
-  for(uint8_t i = 0; i < entity->componentCount; i++) {
-    entitycomponentid_t compId = entity->components[i];
-    entitycomponent_t *comp = &ENTITY_MANAGER.components[compId];
-
-    // Find the component slot for this entity.
-    uint8_t x = 0xFF;
-    for(uint8_t j = 0; j < comp->entityMax; j++) {
-      if(comp->entities[j] == id) {
-        x = j;
-        break;
+  for(componentid_t i = 0; i < ENTITY_COMPONENT_COUNT_MAX; i++) {
+    if(ent->components[i].type == COMPONENT_TYPE_NULL) continue;
+    componentDispose(entityId, i);
   }
-    }
-    assertTrue(x != 0xFF, "Entity does not have this component.");
-
-    // Clear the component slot.
-    comp->entities[x] = 0xFF;
-
-    // Dispose
-    if(comp->dispose != NULL) {
-      void *data = (uint8_t *)comp->data + (comp->dataSize * x);
-      comp->dispose(id, data);
-    }
-  }
-}
-
-entityid_t entityGetId(const entityandentitycomponentid_t id) {
   
+  ent->state = 0;
 }

src/dusk/entity/entity.h

@@ -6,46 +6,37 @@
  */
 
 #pragma once
-#include "entitybase.h"
+#include "component.h"
 
 #define ENTITY_STATE_ACTIVE (1 << 0)
 
 typedef struct {
-  entitycomponentid_t components[ENTITY_COMPONENT_COUNT_MAX];
-  uint8_t componentCount;
   uint8_t state;
+  component_t components[ENTITY_COMPONENT_COUNT_MAX];
 } entity_t;
 
 /**
- * Adds an entity to the entity manager and initializes it.
+ * Initializes an entity with the given ID.
  * 
- * @return The ID of the added entity.
+ * @param entityId The ID of the entity to initialize.
  */
-entityid_t entityAdd();
+void entityInit(const entityid_t entityId);
 
 /**
- * Adds a component to an entity.
+ * Adds a component of the given type to the entity with the given ID.
  * 
- * @param id The ID of the entity to add the component to.
- * @param componentData The data of the component to add.
- * @return The ID of the added component.
+ * @param entityId The ID of the entity to add the component to.
+ * @param type The type of the component to add.
+ * @return The ID of the entity with component.
  */
-entitycomponentid_t entityAddComponent(
-  const entityid_t id,
-  void *componentData
+componentid_t entityAddComponent(
+  const entityid_t entityId,
+  const componenttype_t type
 );
 
 /**
- * Disposes of an entity with the given ID, this will dispose of its components.
+ * Disposes of an entity with the given ID.
  * 
- * @param id The ID of the entity to dispose.
+ * @param entityId The ID of the entity to dispose of.
  */
-void entityRemove(const entityid_t id);
-
-/**
- * Gets an entity id by the entity and entity component id provided.
- * 
- * @param id Id to get the entity id for.
- * @return The entity id.
- */
-entityid_t entityGetId(const entityandentitycomponentid_t id);
+void entityDispose(const entityid_t entityId);

src/dusk/entity/entitybase.h

@@ -8,10 +8,8 @@
 #pragma once
 #include "dusk.h"
 
-#define ENTITY_COUNT_MAX 256
-#define ENTITY_COMPONENT_COUNT_MAX 16
-#define ENTITY_MANAGER_COMPONENT_COUNT_MAX 64
+#define ENTITY_COUNT_MAX 128
+#define ENTITY_COMPONENT_COUNT_MAX 24
 
 typedef uint8_t entityid_t;
-typedef uint8_t entitycomponentid_t;
-typedef uint16_t entityandentitycomponentid_t;
+typedef uint8_t componentid_t;

src/dusk/entity/entitycomponent.c

@@ -1,85 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-
-#include "entitymanager.h"
-#include "util/memory.h"
-#include "assert/assert.h"
-
-entitycomponentid_t entityComponentInit(
-  void *data,
-  const size_t dataSize,
-  const uint8_t entityCountMax,
-  void (*init)(const entityid_t id, void *data),
-  void (*dispose)(const entityid_t id, void *data)
-) {
-  assertNotNull(data, "Component data cannot be null.");
-  assertTrue(dataSize > 0, "Component data size must be greater than 0.");
-  assertTrue(entityCountMax > 0, "Component entity count max be at least 1");
-
-  // Get next available component slot.
-  entitycomponentid_t componentIndex = 0xFF;
-  for(uint8_t i = 0; i <ENTITY_MANAGER_COMPONENT_COUNT_MAX ; i++) {
-    if(ENTITY_MANAGER.components[i].data != NULL) {
-      continue;
-    }
-
-    componentIndex = i;
-    break;
-  }
-  assertTrue(
-    componentIndex < ENTITY_MANAGER_COMPONENT_COUNT_MAX,
-    "No available component slots."
-  );
-
-  entitycomponent_t *component = &ENTITY_MANAGER.components[componentIndex];
-  memoryZero(component, sizeof(entitycomponent_t));
-  component->data = data;
-  component->dataSize = dataSize;
-  component->entityMax = entityCountMax;
-  component->init = init;
-  component->dispose = dispose;
-  
-  // Fill with 0xFF
-  memorySet(component->entities, 0xFF, sizeof(entityid_t) * ENTITY_COUNT_MAX);
-
-  return componentIndex;
-}
-
-entitycomponentid_t entityComponentGetByData(const void *data) {
-  assertNotNull(data, "Component data cannot be null.");
-
-  for(uint8_t i = 0; i < ENTITY_MANAGER_COMPONENT_COUNT_MAX; i++) {
-    if(ENTITY_MANAGER.components[i].data == data) {
-      return i;
-    }
-  }
-
-  return 0xFF;
-}
-
-void * entityComponentGetData(
-  const entitycomponentid_t componentId,
-  const entityid_t entityId
-) {
-  assertTrue(
-    componentId < ENTITY_MANAGER_COMPONENT_COUNT_MAX,
-    "Component ID is out of bounds."
-  );
-  assertTrue(
-    entityId < ENTITY_COUNT_MAX,
-    "Entity ID is out of bounds."
-  );
-  entitycomponent_t *comp = &ENTITY_MANAGER.components[componentId];
-  for(uint8_t i = 0; i < comp->entityMax; i++) {
-    if(comp->entities[i] == entityId) {
-      return (uint8_t *)comp->data + (comp->dataSize * i);
-    }
-  }
-  assertUnreachable("Entity does not have the component.");
-  return NULL;
-}

src/dusk/entity/entitycomponent.h

@@ -1,65 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#pragma once
-#include "entitybase.h"
-
-typedef struct {
-  size_t dataSize;
-  entityid_t entities[ENTITY_COUNT_MAX];
-  uint8_t entityMax;
-
-  void (*init)(const entityid_t id, void *data);
-  void (*dispose)(const entityid_t id, void *data);
-} entitycomponent_t;
-
-#define ENTITY_COMPONENT_DEFINE(name, stc, init, dispose) \
-  static const entitycomponent_t name = { \
-    .dataSize = sizeof(*stc), \
-    .entities = {0}, \
-    .entityMax = ENTITY_COUNT_MAX, \
-    .init = init, \
-    .dispose = dispose \
-  }
-
-/**
- * Adds a component to the entity manager / Initializes a component slot.
- * 
- * @param data The data of the component.
- * @param dataSize The size of the component data.
- * @param entityCountMax The maximum number of entities that can have this component.
- * @param init The function to initialize the component for an entity.
- * @param dispose The function to dispose of the component for an entity.
- * @return The ID of the added component.
- */
-entitycomponentid_t entityComponentInit(
-  void *data,
-  const size_t dataSize,
-  const uint8_t entityCountMax,
-  void (*init)(const entityid_t id, void *data),
-  void (*dispose)(const entityid_t id, void *data)
-);
-
-/**
- * Gets the component ID of a component by its data pointer.
- * 
- * @param data The data pointer of the component.
- * @return The ID of the component, or 0xFF if not found.
- */
-entitycomponentid_t entityComponentGetByData(const void *data);
-
-/**
- * Gets the component data for a given component and entity ID.
- * 
- * @param componentId The ID of the component.
- * @param entityId The ID of the entity.
- * @return The component data.
- */
-void * entityComponentGetData(
-  const entitycomponentid_t componentId,
-  const entityid_t entityId
-);

src/dusk/entity/entitymanager.c

@@ -6,39 +6,28 @@
  */
 
 #include "entitymanager.h"
-#include "util/memory.h"
 #include "assert/assert.h"
-
-#include "entity/component/display/entityposition.h"
-#include "entity/component/display/entitycamera.h"
+#include "util/memory.h"
 
 entitymanager_t ENTITY_MANAGER;
 
 void entityManagerInit(void) {
   memoryZero(&ENTITY_MANAGER, sizeof(entitymanager_t));
+}
 
-  // Init components.
-  entityComponentInit(
-    ENTITY_POSITION_DATA,
-    sizeof(entityposition_t),
-    ENTITY_COUNT_MAX,
-    NULL, NULL
-  );
-
-  entityComponentInit(
-    ENTITY_CAMERA_DATA,
-    sizeof(entitycamera_t),
-    ENTITY_CAMERA_COUNT_MAX,
-    entityCameraInit, NULL
-  );
+entityid_t entityManagerAdd() {
+  for(entityid_t i = 0; i < ENTITY_COUNT_MAX; i++) {
+    if((ENTITY_MANAGER.entities[i].state & ENTITY_STATE_ACTIVE) != 0) continue;
+    entityInit(i);
+    return i;
+  }
+  assertUnreachable("No more entity IDs available");
+  return 0xFF;
 }
 
 void entityManagerDispose(void) {
-  for(uint8_t i = 0; i < ENTITY_COUNT_MAX; i++) {
-    if((ENTITY_MANAGER.entities[i].state & ENTITY_STATE_ACTIVE) == 0) {
-      continue;
-    }
-    
-    entityRemove(i);
+  for(entityid_t i = 0; i < ENTITY_COUNT_MAX; i++) {
+    if((ENTITY_MANAGER.entities[i].state & ENTITY_STATE_ACTIVE) == 0) continue;
+    entityDispose(i);
   }
 }

src/dusk/entity/entitymanager.h

@@ -7,11 +7,9 @@
 
 #pragma once
 #include "entity.h"
-#include "entitycomponent.h"
 
 typedef struct {
   entity_t entities[ENTITY_COUNT_MAX];
-  entitycomponent_t components[ENTITY_MANAGER_COMPONENT_COUNT_MAX];
 } entitymanager_t;
 
 extern entitymanager_t ENTITY_MANAGER;
@@ -22,6 +20,13 @@ extern entitymanager_t ENTITY_MANAGER;
 void entityManagerInit(void);
 
 /**
- * Disposes of the entity manager, this will dispose active entities.
+ * Adds / Reserves a new entity ID.
+ * 
+ * @return The new entity ID.
+ */
+entityid_t entityManagerAdd();
+
+/**
+ * Disposes of the entity manager, in turn freeing all entities and components.
  */
 void entityManagerDispose(void);