Slightly improve custom behaviour components

include/scene.h

@@ -106,6 +106,8 @@ class Scene {
   Application* const app_;
   uint32_t next_entity_id_ = 1000;
 
+  uint64_t framecount_ = 0;
+
   /* ecs stuff */
 
   size_t next_signature_position_ = 0;

include/systems/custom_behaviour.h

@@ -1,6 +1,8 @@
 #ifndef ENGINE_INCLUDE_CUSTOM_BEHAVIOUR_H_
 #define ENGINE_INCLUDE_CUSTOM_BEHAVIOUR_H_
 
+#include <unordered_map>
+
 #include "ecs_system.h"
 
 /* This system allows for one-off custom components that execute arbitrary code
@@ -17,7 +19,7 @@ namespace engine {
   void OnComponentInsert(uint32_t entity) override;
 
  private:
-       
+  std::unordered_map<uint32_t, bool> entity_is_initialised_{};
 };
 
 }  // namespace engine

src/systems/custom_behaviour.cpp

@@ -20,13 +20,20 @@ void CustomBehaviourSystem::OnUpdate(float ts) {
   for (uint32_t entity : entities_) {
     auto c = scene_->GetComponent<CustomComponent>(entity);
     assert(c != nullptr);
+    bool& entity_initialised = entity_is_initialised_.at(entity);
+    if (entity_initialised == false) {
+      if (c->onInit == nullptr) throw std::runtime_error("CustomComponent::onInit not set! Entity: " + std::to_string(entity));
+      if (c->onUpdate == nullptr) throw std::runtime_error("CustomComponent::onUpdate not set! Entity: " + std::to_string(entity));
+      c->onInit();
+      entity_initialised = true;
+    }
     c->onUpdate(ts);
   }
 }
 
 void CustomBehaviourSystem::OnComponentInsert(uint32_t entity)
 {
-  (void)entity;
+  entity_is_initialised_.emplace(entity, false);
 }
 
 }  // namespace engine

test/src/game.cpp

@@ -123,15 +123,23 @@ void PlayGame(GameSettings settings) {
 
   auto cobbleHouse = engine::util::LoadMeshFromFile(
       my_scene, app.GetResourcePath("models/cobble_house/cobble_house.dae"));
-  my_scene->GetComponent<engine::TransformComponent>(cobbleHouse)->position += glm::vec3{
+  my_scene->GetComponent<engine::TransformComponent>(cobbleHouse)->position +=
-      33.0f, 0.1f, 35.0f};
+      glm::vec3{33.0f, 0.1f, 35.0f};
+  auto cobbleCustom = my_scene->AddComponent<engine::CustomComponent>(cobbleHouse);
+  cobbleCustom->onInit = [](void) {
+    LOG_INFO("Cobble house spin component initialised!");
+  };
+  cobbleCustom->onUpdate = [&](float ts) {
+    static auto t = my_scene->GetComponent<engine::TransformComponent>(cobbleHouse);
+    t->rotation *= glm::angleAxis(ts, glm::vec3{0.0f, 0.0f, 1.0f});
+  };
 
   /* some text */
   {
     int width, height;
     auto bitmap = app.GetResource<engine::resources::Font>("builtin.mono")
-                      ->GetTextBitmap("ABCDEFGHIJKLMNOPQRSTUVWXYZ12345", 1080.0f,
+                      ->GetTextBitmap("ABCDEFGHIJKLMNOPQRSTUVWXYZ12345",
-                                      width, height);
+                                      1080.0f, width, height);
 
     uint32_t textbox = my_scene->CreateEntity("textbox");
     auto textbox_renderable =
@@ -148,14 +156,22 @@ void PlayGame(GameSettings settings) {
         (float)height / (float)width;
     textbox_renderable->shown = true;
 
-    my_scene->AddComponent<engine::CustomComponent>(textbox)->onUpdate =
+    auto textboxComponent =
-        [&](float ts) {
+        my_scene->AddComponent<engine::CustomComponent>(textbox);
+
+    textboxComponent->onInit = [](void) {
+      LOG_INFO("Textbox custom component initialised!");
+    };
+
+    textboxComponent->onUpdate = [&](float ts) {
       (void)ts;
       static float time_elapsed;
       time_elapsed += ts;
       if (time_elapsed >= 1.0f) {
         time_elapsed = 0.0f;
 
+        LOG_INFO("COMPONENT UPDATE");
+
         // LOG_INFO("Creating new bitmap...");
         // auto fpsBitmap =
         //     app.GetResource<engine::resources::Font>("builtin.mono")