feat: implement contact listeners

lightkeeper/CMakeLists.txt

@@ -9,6 +9,7 @@ set(GAME_SRC
 
     src/components/GameComponentRegistry.cpp
     src/components/PrintComponent.cpp
+    src/components/TriggerLoggerComponent.cpp
 )
 
 add_executable(lightkeeper ${GAME_SRC})

lightkeeper/include/components/GameComponentList.h

@@ -2,8 +2,10 @@
 #define LIGHTKEEPER_GAMECOMPONENTLIST_H
 
 #include <components/PrintComponent.h>
+#include <components/TriggerLoggerComponent.h>
 
 #define LIGHTKEEPER_GAME_COMPONENTS(X) \
-    X(PrintComponent)
+    X(PrintComponent) \
+    X(TriggerLoggerComponent)
 
 #endif // LIGHTKEEPER_GAMECOMPONENTLIST_H

lightkeeper/include/components/TriggerLoggerComponent.h

@@ -0,0 +1,22 @@
+#ifndef DESTRUM_TRIGGERLOGGERCOMPONENT_H
+#define DESTRUM_TRIGGERLOGGERCOMPONENT_H
+#include "destrum/ObjectModel/Component.h"
+
+class TriggerLoggerComponent: public Component {
+public:
+    TriggerLoggerComponent(GameObject& parent);
+
+    std::string GetTypeName() const override { return "TriggerLoggerComponent"; }
+
+    void OnTriggerEnter(GameObject* other) override;
+    void OnTriggerExit(GameObject* other) override;
+
+    nlohmann::json Serialize() const override;
+    void Deserialize(const nlohmann::json&) override;
+
+    int triggerEnterCount{0};
+    int triggerExitCount{0};
+    std::string lastOtherName;
+};
+
+#endif //DESTRUM_TRIGGERLOGGERCOMPONENT_H

lightkeeper/src/Lightkeeper.cpp

@@ -18,6 +18,7 @@
 #include "destrum/ObjectModel/GameObject.h"
 #include "destrum/Util/ModelDoc.h"
 #include "destrum/Components/Animator.h"
+#include <components/TriggerLoggerComponent.h>
 
 
 #include <filesystem>
@@ -433,9 +434,15 @@ void LightKeeper::customInit()
     sphereMaterial = resources.materials().addSimpleColorMaterial({0.5f, 0.3f, 0.8f}, "Blue");
 
 
-    auto obj = scene.CreateGameObject("GameObject");
-    auto printComp = obj->AddComponent<PrintComponent>();
-    printComp->SetMessage("Testing");
+    // Trigger zone: a static box with a TriggerLoggerComponent.
+    // Spheres spawned via the "Spawn ball" button fall through it.
+    auto triggerObj = scene.CreateGameObject("TriggerBox");
+    auto triggerBox = triggerObj->AddComponent<BoxCollider>(glm::vec3{3.0f, 3.0f, 3.0f});
+    triggerBox->SetTrigger(true);
+    auto triggerRb = triggerObj->AddComponent<Rigidbody>();
+    triggerRb->SetType(RigidbodyType::Static);
+    triggerObj->AddComponent<TriggerLoggerComponent>();
+    triggerObj->GetTransform().SetWorldPosition({0.0f, 0.0f, 0.0f});
 
 
 }

lightkeeper/src/components/TriggerLoggerComponent.cpp

@@ -0,0 +1,45 @@
+#include <components/TriggerLoggerComponent.h>
+
+#include "spdlog/spdlog.h"
+#include <destrum/ObjectModel/GameObject.h>
+
+TriggerLoggerComponent::TriggerLoggerComponent(GameObject& parent)
+    : Component(parent, "TriggerLoggerComponent") {}
+
+void TriggerLoggerComponent::OnTriggerEnter(GameObject* other) {
+    ++triggerEnterCount;
+    lastOtherName = other ? other->GetName() : "null";
+    spdlog::info(
+        "TriggerLogger: ENTER {} -> {} (enters: {}, exits: {})",
+        GetGameObject()->GetName(),
+        lastOtherName,
+        triggerEnterCount,
+        triggerExitCount);
+}
+
+void TriggerLoggerComponent::OnTriggerExit(GameObject* other) {
+    ++triggerExitCount;
+    lastOtherName = other ? other->GetName() : "null";
+    spdlog::info(
+        "TriggerLogger: EXIT {} -> {} (enters: {}, exits: {})",
+        GetGameObject()->GetName(),
+        lastOtherName,
+        triggerEnterCount,
+        triggerExitCount);
+}
+
+nlohmann::json TriggerLoggerComponent::Serialize() const {
+    return {
+        {"triggerEnterCount", triggerEnterCount},
+        {"triggerExitCount", triggerExitCount}
+    };
+}
+
+void TriggerLoggerComponent::Deserialize(const nlohmann::json& data) {
+    if (data.contains("triggerEnterCount")) {
+        triggerEnterCount = data.at("triggerEnterCount").get<int>();
+    }
+    if (data.contains("triggerExitCount")) {
+        triggerExitCount = data.at("triggerExitCount").get<int>();
+    }
+}