feat: add firstpersoncontroller

lightkeeper/CMakeLists.txt

@@ -8,6 +8,7 @@ set(GAME_SRC
     src/Lightkeeper.cpp
 
     src/components/GameComponentRegistry.cpp
+    src/components/FirstPersonController.cpp
     src/components/PrintComponent.cpp
     src/components/TriggerLoggerComponent.cpp
 )

lightkeeper/include/Lightkeeper.h

@@ -10,6 +10,7 @@
 #include "destrum/Graphics/Resources/Cubemap.h"
 #include "destrum/ObjectModel/GameObject.h"
 
+class FirstPersonController;
 class LightKeeper final : public App {
 public:
     LightKeeper();
@@ -39,6 +40,8 @@ private:
     std::unique_ptr<CubeMap> skyboxCubemap;
 
     GameObject* capybara = nullptr;
+    GameObject* m_Player = nullptr;
+    FirstPersonController* m_FPSController = nullptr;
 
     char scenePath[512]{"scenes/debug_scene.json"};
     char newSceneName[128]{"EmptyScene"};

lightkeeper/include/components/FirstPersonController.h

@@ -0,0 +1,48 @@
+#ifndef LIGHTKEEPER_FIRSTPERSONCONTROLLER_H
+#define LIGHTKEEPER_FIRSTPERSONCONTROLLER_H
+
+#include <glm/glm.hpp>
+#include <destrum/Input/InputManager.h>
+#include <destrum/ObjectModel/Component.h>
+
+class Rigidbody;
+class CapsuleCollider;
+
+class FirstPersonController final : public Component {
+public:
+    explicit FirstPersonController(GameObject& parent);
+
+    std::string GetTypeName() const override { return "FirstPersonController"; }
+
+    void Start() override;
+    void Update(float dt) override;
+    void FixedUpdate(float fixedDt) override;
+    void ImGuiInspector() override;
+    nlohmann::json Serialize() const override;
+    void Deserialize(const nlohmann::json& data) override;
+
+    [[nodiscard]] float GetYaw() const { return m_Yaw; }
+    [[nodiscard]] float GetPitch() const { return m_Pitch; }
+    [[nodiscard]] float GetEyeHeight() const { return m_EyeHeight; }
+
+    void SetMovementSpeed(float speed) { m_MovementSpeed = speed; }
+    [[nodiscard]] float GetMovementSpeed() const { return m_MovementSpeed; }
+
+    void SetMouseSensitivity(float sens) { m_MouseSensitivity = sens; }
+    [[nodiscard]] float GetMouseSensitivity() const { return m_MouseSensitivity; }
+
+    [[nodiscard]] bool IsMouseCaptured() const { return InputManager::GetInstance().IsMouseCaptured(); }
+    void SetMouseCaptured(bool captured);
+
+private:
+    Rigidbody* m_Rigidbody{nullptr};
+    CapsuleCollider* m_Capsule{nullptr};
+
+    float m_Yaw{0.0f};
+    float m_Pitch{0.0f};
+    float m_MovementSpeed{5.0f};
+    float m_MouseSensitivity{0.002f};
+    float m_EyeHeight{1.6f};
+};
+
+#endif

lightkeeper/include/components/GameComponentList.h

@@ -1,10 +1,12 @@
 #ifndef LIGHTKEEPER_GAMECOMPONENTLIST_H
 #define LIGHTKEEPER_GAMECOMPONENTLIST_H
 
+#include <components/FirstPersonController.h>
 #include <components/PrintComponent.h>
 #include <components/TriggerLoggerComponent.h>
 
 #define LIGHTKEEPER_GAME_COMPONENTS(X) \
+    X(FirstPersonController) \
     X(PrintComponent) \
     X(TriggerLoggerComponent)
 

lightkeeper/src/Lightkeeper.cpp

@@ -20,6 +20,7 @@
 #include "destrum/ObjectModel/GameObject.h"
 #include "destrum/Util/ModelDoc.h"
 #include "destrum/Components/Animator.h"
+#include <components/FirstPersonController.h>
 #include <components/TriggerLoggerComponent.h>
 
 
@@ -446,6 +447,13 @@ void LightKeeper::customInit()
     triggerObj->AddComponent<TriggerLoggerComponent>();
     triggerObj->GetTransform().SetWorldPosition({0.0f, 0.0f, 0.0f});
 
+    auto playerObj = scene.CreateGameObject("Player");
+    playerObj->GetTransform().SetWorldPosition(glm::vec3(0.0f, 2.0f, -5.0f));
+    auto* fps = playerObj->AddComponent<FirstPersonController>();
+    m_Player = playerObj;
+    m_FPSController = fps;
+    scene.GetPhysics().RegisterGameObject(*playerObj);
+
     const auto texPath = AssetFS::GetInstance().GetFullPath("engine://textures/kobe.png");
     texID = resources.loadImageFromFile(gfxDevice, texPath);
 
@@ -455,7 +463,19 @@ void LightKeeper::customUpdate(float dt)
 {
     // LightKeeper owns a camera that hides App::camera; update this instance
     // after SDL events have been consumed.
-    camera.Update(dt);
+    if (m_FPSController != nullptr && m_FPSController->IsMouseCaptured())
+    {
+        auto& playerTransform = m_Player->GetTransform();
+        const glm::vec3 playerPos = playerTransform.GetWorldPosition();
+        camera.SetRotation(m_FPSController->GetYaw(), m_FPSController->GetPitch());
+        camera.m_position = playerPos + glm::vec3(0.0f, m_FPSController->GetEyeHeight(), 0.0f);
+        camera.CalculateViewMatrix();
+        camera.CalculateProjectionMatrix();
+    }
+    else
+    {
+        camera.Update(dt);
+    }
     SceneManager::GetInstance().Update(dt);
     SceneManager::GetInstance().LateUpdate(dt);
 

lightkeeper/src/components/FirstPersonController.cpp

@@ -0,0 +1,140 @@
+#include <components/FirstPersonController.h>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/quaternion.hpp>
+#include <glm/gtx/norm.hpp>
+
+#include <destrum/Components/Physics/CapsuleCollider.h>
+#include <destrum/Components/Physics/Rigidbody.h>
+#include <destrum/Input/InputManager.h>
+#include <destrum/ObjectModel/GameObject.h>
+#include <destrum/Physics/PhysicsWorld.h>
+#include <destrum/Scene/Scene.h>
+
+#include <imgui.h>
+
+FirstPersonController::FirstPersonController(GameObject& parent)
+    : Component(parent, "FirstPersonController")
+{
+}
+
+void FirstPersonController::SetMouseCaptured(bool captured)
+{
+    InputManager::GetInstance().SetMouseCaptured(captured);
+}
+
+void FirstPersonController::Start()
+{
+    auto* obj = GetGameObject();
+    m_Capsule = obj->AddComponent<CapsuleCollider>(0.5f, 2.0f);
+    m_Rigidbody = obj->AddComponent<Rigidbody>();
+    m_Rigidbody->SetMass(80.0f);
+    m_Rigidbody->SetAllowSleep(false);
+    m_Rigidbody->SetUseGravity(true);
+}
+
+void FirstPersonController::Update(float)
+{
+    const auto& input = InputManager::GetInstance();
+
+    if (input.WasKeyPressed(SDL_SCANCODE_F5))
+    {
+        SetMouseCaptured(!IsMouseCaptured());
+    }
+
+    if (!IsMouseCaptured())
+    {
+        if (input.WasMousePressed(SDL_BUTTON_LEFT) && !ImGui::GetIO().WantCaptureMouse)
+        {
+            SetMouseCaptured(true);
+        }
+        return;
+    }
+
+    if (input.WasKeyPressed(SDL_SCANCODE_ESCAPE))
+    {
+        SetMouseCaptured(false);
+        return;
+    }
+
+    if (input.WasKeyPressed(SDL_SCANCODE_SPACE) && m_Rigidbody->HasPhysicsBody())
+    {
+        m_Rigidbody->AddImpulse(glm::vec3(0.0f, 400.0f, 0.0f));
+    }
+
+    m_Yaw += static_cast<float>(input.MouseDeltaX()) * m_MouseSensitivity;
+    m_Pitch -= static_cast<float>(input.MouseDeltaY()) * m_MouseSensitivity;
+    m_Pitch = glm::clamp(m_Pitch, glm::radians(-89.0f), glm::radians(89.0f));
+}
+
+void FirstPersonController::FixedUpdate(float)
+{
+    if (!IsMouseCaptured() || m_Rigidbody == nullptr || !m_Rigidbody->HasPhysicsBody())
+        return;
+
+    const auto& input = InputManager::GetInstance();
+
+    const float cosY = glm::cos(m_Yaw);
+    const float sinY = glm::sin(m_Yaw);
+    const glm::vec3 forward{cosY, 0.0f, sinY};
+    const glm::vec3 right{-sinY, 0.0f, cosY};
+
+    glm::vec3 moveDir(0.0f);
+    if (input.IsKeyDown(SDL_SCANCODE_W)) moveDir += forward;
+    if (input.IsKeyDown(SDL_SCANCODE_S)) moveDir -= forward;
+    if (input.IsKeyDown(SDL_SCANCODE_D)) moveDir += right;
+    if (input.IsKeyDown(SDL_SCANCODE_A)) moveDir -= right;
+
+    glm::vec3 velocity(0.0f);
+    if (glm::length2(moveDir) > 0.0f)
+    {
+        moveDir = glm::normalize(moveDir);
+        velocity = moveDir * m_MovementSpeed;
+    }
+
+    velocity.y = m_Rigidbody->GetLinearVelocity().y;
+    m_Rigidbody->SetLinearVelocity(velocity);
+
+    auto* world = m_Rigidbody->GetPhysicsWorld();
+    if (world != nullptr)
+    {
+        PhysicsTransform xform = world->GetBodyTransform(m_Rigidbody->GetBody());
+        xform.rotation = glm::quat(glm::vec3(0.0f, m_Yaw, 0.0f));
+        world->SetBodyTransform(m_Rigidbody->GetBody(), xform);
+    }
+}
+
+void FirstPersonController::ImGuiInspector()
+{
+    Component::ImGuiInspector();
+    ImGui::DragFloat("Movement Speed", &m_MovementSpeed, 0.1f, 0.0f, 100.0f);
+    ImGui::DragFloat("Mouse Sensitivity", &m_MouseSensitivity, 0.0001f, 0.0f, 0.1f);
+    ImGui::DragFloat("Eye Height", &m_EyeHeight, 0.01f, 0.0f, 5.0f);
+    ImGui::Text("Yaw: %.1f deg", glm::degrees(m_Yaw));
+    ImGui::Text("Pitch: %.1f deg", glm::degrees(m_Pitch));
+    bool captured = IsMouseCaptured();
+    ImGui::Checkbox("Mouse Captured", &captured);
+    if (captured != IsMouseCaptured()) {
+        SetMouseCaptured(captured);
+    }
+}
+
+nlohmann::json FirstPersonController::Serialize() const
+{
+    return {
+        {"movementSpeed", m_MovementSpeed},
+        {"mouseSensitivity", m_MouseSensitivity},
+        {"eyeHeight", m_EyeHeight},
+        {"yaw", m_Yaw},
+        {"pitch", m_Pitch},
+    };
+}
+
+void FirstPersonController::Deserialize(const nlohmann::json& data)
+{
+    if (data.contains("movementSpeed")) m_MovementSpeed = data.at("movementSpeed").get<float>();
+    if (data.contains("mouseSensitivity")) m_MouseSensitivity = data.at("mouseSensitivity").get<float>();
+    if (data.contains("eyeHeight")) m_EyeHeight = data.at("eyeHeight").get<float>();
+    if (data.contains("yaw")) m_Yaw = data.at("yaw").get<float>();
+    if (data.contains("pitch")) m_Pitch = data.at("pitch").get<float>();
+}