feat: scene + entity class

engine/CMakeLists.txt

@@ -5,9 +5,8 @@ set(SOURCES
   src/IO/file_manager.cpp
   src/renderer/debug.cpp
 
-  src/window/window.cpp
-
   src/scene/scene.cpp
+  src/window/window.cpp
 
   src/components/batch.cpp
   src/renderer/mesh.cpp

engine/include/engine/IO/file_manager.h

@@ -3,6 +3,8 @@
 
 #include <string>
 
+namespace Engine {
+
 class FileManager
 {
 public:
@@ -12,4 +14,6 @@ public:
     static std::string read(const std::string &filename);
 };
 
+}
+
 #endif // FILE_MANAGER_H

engine/include/engine/IO/parser.h

@@ -1,6 +1,8 @@
 #ifndef PARSER_H_
 #define PARSER_H_
 
+namespace Engine {
+
 // Very fast OBJ/MTL line parser
 class Parser {
 private:
@@ -17,4 +19,6 @@ public:
     int TakeIndex(int baseCount);
 };
 
+}
+
 #endif // PARSER_H_

engine/include/engine/api.h

@@ -9,10 +9,10 @@
 #include "engine/app/app.h"
 #include "engine/renderer/core.h"
 
-extern IApplication* CreateApplication();
+extern Engine::IApplication* CreateApplication();
 
 int main() {
-    auto engine = Engine::GetInstance();
+    auto engine = Engine::Engine::GetInstance();
-    engine->Run(std::unique_ptr<IApplication>(CreateApplication()));
+    engine->Run(std::unique_ptr<Engine::IApplication>(CreateApplication()));
     return 0;
 }

engine/include/engine/app/app.h

@@ -5,8 +5,9 @@
 #include "engine/window/event.hpp"
 #include "engine/export.h"
 
-class ENGINE_API IApplication {
+namespace Engine {
-public:
+    class ENGINE_API IApplication {
+    public:
         virtual ~IApplication() = default;
 
         virtual void OnInit(std::shared_ptr<Scene> scene) {};
@@ -14,6 +15,7 @@ public:
         virtual void OnShutdown() {};
         
         virtual void OnEvent(const Event& event) {};
-};
+    };
+}
 
 #endif // APPLICATION_H_

engine/include/engine/components/batch.h

@@ -4,6 +4,7 @@
 #include <glm/mat4x4.hpp>
 #include "engine/export.h"
 
+namespace Engine {
 // requires mesh component
 struct ENGINE_API batch {
     friend class Renderer;
@@ -25,5 +26,6 @@ private:
 private:
     void prepare(glm::mat4 *instances, unsigned int count);
 };
+}
 
 #endif // COMPONENT_BATCH_H_

engine/include/engine/components/camera.h

@@ -3,6 +3,8 @@
 
 #include "engine/export.h"
 
+namespace Engine {
 struct ENGINE_API camera {};
+}
 
 #endif // COMPONENTS_PLAYER_H_

engine/include/engine/components/light.h

@@ -6,6 +6,7 @@
 #include "engine/renderer/renderer.h"
 #include "engine/export.h"
 
+namespace Engine {
 struct ENGINE_API light {
     friend class Renderer;
 public:
@@ -25,5 +26,6 @@ private:
     glm::mat4 lightSpace;
     int shadowRes{1024};
 };
+}
 
 #endif // COMPONENTS_LIGHT_H_

engine/include/engine/components/mesh.h

@@ -6,8 +6,10 @@
 #include "engine/renderer/wavefront.h"
 #include "engine/export.h"
 
+namespace Engine {
 struct ENGINE_API mesh {
     std::shared_ptr<Object> object;
 };
+}
 
 #endif // COMPONENTS_MESH_H_

engine/include/engine/components/rotate.h

@@ -3,6 +3,8 @@
 
 #include "engine/export.h"
 
+namespace Engine {
 struct ENGINE_API rotate {};
+}
 
 #endif // COMPONENT_ROTATE_H_

engine/include/engine/components/transform.h

@@ -4,10 +4,12 @@
 #include <glm/glm.hpp>
 #include "engine/export.h"
 
+namespace Engine {
 struct ENGINE_API transform {
     glm::vec3 position;
     glm::vec3 rotation;
     glm::vec3 scale;
 };
+}
 
 #endif // COMPONENTS_TRANSFORM_H_

engine/include/engine/renderer/basics.h

@@ -3,6 +3,8 @@
 
 #include <glm/glm.hpp>
 
+namespace Engine {
+
 class Vertex {
     friend class Mesh;
 private:
@@ -14,4 +16,6 @@ public:
         : m_position(position), m_normal(normal), m_texCoord(texCoord) {}
 };
 
+}
+
 #endif // RENDERER_BASICS_H

engine/include/engine/renderer/core.h

@@ -13,6 +13,8 @@
 #include "engine/app/app.h"
 #include "engine/export.h"
 
+namespace Engine {
+
 class ENGINE_API Engine : public EventHandler {
 public:
     static Engine* GetInstance();    
@@ -31,5 +33,6 @@ private:
     bool m_running;
 };
 
+}
 
 #endif // ENGINE_H_

engine/include/engine/renderer/debug.h

@@ -3,6 +3,8 @@
 
 #include <GL/glew.h>
 
+namespace Engine {
+
 void MessageCallback(GLenum source,
                      GLenum type,
                      GLuint id,
@@ -11,4 +13,6 @@ void MessageCallback(GLenum source,
                      const GLchar* message,
                      const void* userParam);
 
+}
+
 #endif // RENDERER_DEBUG_

engine/include/engine/renderer/material.h

@@ -6,6 +6,8 @@
 
 #include "engine/renderer/texture.h"
 
+namespace Engine {
+
 class Material {
 private:
     glm::vec3 m_ambient { 0.2f, 0.2f, 0.2f };
@@ -39,4 +41,6 @@ public:
     inline void SetIllumination(float illum) { m_illum = illum; }
 };
 
+}
+
 #endif // MATERIAL_H_

engine/include/engine/renderer/mesh.h

@@ -7,6 +7,8 @@
 
 #include "engine/renderer/basics.h"
 
+namespace Engine {
+
 class Mesh {
 public: // TODO: abstract away
     unsigned int m_vao, m_vbo, m_ebo;
@@ -24,4 +26,6 @@ public:
     void Render(unsigned int count);
 };
 
+}
+
 #endif // MESH_H_

engine/include/engine/renderer/renderer.h

@@ -8,6 +8,8 @@
 #include "engine/export.h"
 #include "engine/components/light.h"
 
+namespace Engine {
+
 // TODO: make static or singleton
 class ENGINE_API Renderer {
 public:
@@ -37,4 +39,6 @@ private:
     glm::mat4 m_view;
 };
 
+}
+
 #endif // RENDERER_H_

engine/include/engine/renderer/shader.h

@@ -7,6 +7,8 @@
 
 #include "engine/export.h"
 
+namespace Engine {
+
 class ENGINE_API Shader
 {
 public:
@@ -45,4 +47,6 @@ private:
     void checkLinkingError();
 };
 
+}
+
 #endif // SHADER_H

engine/include/engine/renderer/texture.h

@@ -3,6 +3,8 @@
 #include <string>
 #include <memory>
 
+namespace Engine {
+
 class Texture {
 public:
     Texture() : m_id(0) {}
@@ -13,4 +15,6 @@ private:
     unsigned int m_id;
 };
 
+}
+
 #endif // TEXTURE_H_

engine/include/engine/renderer/wavefront.h

@@ -14,6 +14,8 @@
 
 #include "engine/export.h"
 
+namespace Engine {
+
 enum ObjElement { OHASH, MTLLIB, USEMTL, O, V, VN, VT, F, OUNKNOWN };
 enum MtlElement { MHASH, NEWMTL, NS, KA, KS, KD, NI, D, ILLUM, MAP_KD, MAP_KA, MUNKNOWN };
 
@@ -53,4 +55,6 @@ private:
     std::unordered_map<std::string, std::shared_ptr<Material>> m_materials;
 };
 
+}
+
 #endif // MODEL_H_

engine/include/engine/scene/scene.h

@@ -1,15 +1,44 @@
-#ifndef ENGINE_SCENE_H_
+#pragma once
-#define ENGINE_SCENE_H_
 
 #include <entt/entt.hpp>
+#include <memory>
+
+namespace Engine {
+
+class Entity;
 
 class Scene {
+private:
+    friend class Entity;
 public:
-    Scene();
+    Scene() = default;
+
+    Entity CreateEntity();
 private:
     entt::registry m_registry;
     friend class Renderer;
-    friend class Game;
 };
 
-#endif // ENGINE_SCENE_H_
+class Entity {
+public:
+    Entity() = default;
+    Entity(entt::entity entity, Scene* scene) : m_entity(entity), m_scene(scene) {}
+    Entity(const Entity& other) = default;
+
+    template<typename Type, typename... Args>
+    inline auto AddComponent(Args &&...args) {
+        assert(this->m_scene != nullptr && "Scene has not been assigned to the entity");
+        return m_scene->m_registry.emplace<Type>(m_entity, std::forward<Args>(args)...);
+    }
+
+    template<typename Type>
+    [[nodiscard]] inline auto GetComponent() {
+        assert(this->m_scene != nullptr && "Scene has not been assigned to the entity");
+        return m_scene->m_registry.get<Type>(m_entity);
+    }
+private:
+    entt::entity m_entity { 0 };
+    Scene *m_scene = nullptr;
+};
+
+} // namespace Engine

engine/include/engine/window/event.hpp

@@ -7,6 +7,8 @@
 #include <unordered_map>
 #include <vector>
 
+namespace Engine {
+
 enum class EventType {
     WINDOW_RESIZE,
     WINDOW_CLOSE,
@@ -71,4 +73,6 @@ private:
     std::size_t m_next_id = 1;
 };
 
+}
+
 #endif // EVENT_H_

engine/include/engine/window/events/window_events.h

@@ -3,6 +3,8 @@
 
 #include "engine/window/event.hpp"
 
+namespace Engine {
+
 class WindowEvent : public Event {
 public:
     WindowEvent() : Event(Event::EventCategory::WINDOW) {}
@@ -27,4 +29,6 @@ public:
     WindowCloseEvent() {}
 };
 
+}
+
 #endif // WINDOW_EVENTS_H_

engine/include/engine/window/window.h

@@ -13,6 +13,8 @@
 #define DEFAULT_WIDTH 1024
 #define DEFAULT_HEIGHT 768
 
+namespace Engine {
+
 class Window : public EventEmitter {
     friend class Engine;
 private:
@@ -48,4 +50,6 @@ private:
     int m_height;
 };
 
+}
+
 #endif //WINDOW_H_

engine/src/IO/file_manager.cpp

@@ -4,6 +4,8 @@
 #include <iostream>
 #include <sstream>
 
+namespace Engine {
+
 FileManager::FileManager()
 {
 }
@@ -31,3 +33,5 @@ std::string FileManager::read(const std::string &filename)
 
     return fileStream.str();
 }
+
+}

engine/src/IO/parser.cpp

@@ -4,6 +4,8 @@
 
 #include "engine/IO/parser.h"
 
+namespace Engine {
+
 // Skip whitespace
 void Parser::SkipSpaces() {
     while (*m_sv == ' ' || *m_sv == '\t') ++m_sv;
@@ -121,3 +123,5 @@ bool Parser::TakeFaceIndices(int &vi, int &ti, int &ni) {
     // Do NOT mutate indices (leave them raw). Let NormalizeIndex handle conversion.
     return true;
 }
+
+}

engine/src/components/batch.cpp

@@ -2,6 +2,8 @@
 
 #include "engine/components/batch.h"
 
+namespace Engine {
+
 unsigned int batch::LastID = 0;
 
 batch::batch() {
@@ -28,3 +30,5 @@ void batch::prepare(glm::mat4 *instances, unsigned int count) {
     glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(glm::mat4) * count, instances);
     glBindBuffer(GL_ARRAY_BUFFER, 0);
 }
+
+}

engine/src/renderer/core.cpp

@@ -5,6 +5,8 @@
 #include "engine/window/event.hpp"
 #include "engine/renderer/wavefront.h"
 
+namespace Engine {
+
 Engine* Engine::s_instance = nullptr;
 
 void Engine::Run(std::unique_ptr<IApplication> app) {
@@ -66,3 +68,4 @@ Engine* Engine::GetInstance() {
     return s_instance;
 }
 
+}

engine/src/renderer/debug.cpp

@@ -2,6 +2,8 @@
 
 #include <iostream>
 
+namespace Engine {
+
 void MessageCallback(GLenum source,
                      GLenum type,
                      GLuint id,
@@ -59,3 +61,5 @@ void MessageCallback(GLenum source,
     //         (type == GL_DEBUG_TYPE_ERROR ? "** GL ERROR **" : ""),
     //         type, severity, message);
 }
+
+}

engine/src/renderer/mesh.cpp

@@ -2,6 +2,8 @@
 
 #include "engine/renderer/mesh.h"
 
+namespace Engine {
+
 Mesh::Mesh() {
     m_vao = 0;
     m_vbo = 0;
@@ -58,3 +60,5 @@ void Mesh::Render(unsigned int count)
     }
     Unbind();
 }
+
+}

engine/src/renderer/renderer.cpp

@@ -18,6 +18,8 @@
 #include "engine/components/mesh.h"
 #include "engine/components/batch.h"
 
+namespace Engine {
+
 Renderer::Renderer(std::shared_ptr<Scene> scene) : m_scene(scene)
 {
     m_proj = glm::perspective(
@@ -246,3 +248,5 @@ void Renderer::Render() {
     UpdateView();
     RenderScene(m_shader);
 }
+
+}

engine/src/renderer/shader.cpp

@@ -2,6 +2,8 @@
 #include <GL/glew.h>
 #include "engine/renderer/shader.h"
 
+namespace Engine {
+
 Shader::Shader()
 {
 }
@@ -133,3 +135,5 @@ void Shader::checkLinkingError()
                   << std::endl;
     }
 }
+
+}

engine/src/renderer/texture.cpp

@@ -7,6 +7,8 @@
 #define STB_IMAGE_IMPLEMENTATION
 #include "stb_image.h"
 
+namespace Engine {
+
 std::unique_ptr<Texture> Texture::LoadFile(const std::string& filename) {
     auto texture = std::make_unique<Texture>();
 
@@ -34,3 +36,5 @@ std::unique_ptr<Texture> Texture::LoadFile(const std::string& filename) {
 
     return std::move(texture);
 }
+
+}

engine/src/renderer/wavefront.cpp

@@ -12,6 +12,8 @@
 
 #define DEFAULT_MATERIAL_NAME "default"
 
+namespace Engine {
+
 // ObjElement toElement(const std::string &s) {
 //     if (s == "#") return ObjElement::OHASH;
 //     if (s == "mtllib") return ObjElement::MTLLIB;
@@ -509,4 +511,4 @@ void Object::Render(Shader& shader, unsigned int count)
     }
 }
 
-
+}

engine/src/scene/scene.cpp

@@ -1,4 +1,9 @@
 #include "engine/scene/scene.h"
 
-Scene::Scene() : m_registry() {
+namespace Engine {
+
+Entity Scene::CreateEntity() {
+    return { m_registry.create(), this };
+}
+
 }

engine/src/window/window.cpp

@@ -8,6 +8,8 @@
 
 #include "engine/renderer/debug.h"
 
+namespace Engine {
+
 std::shared_ptr<Window> Window::s_instance = nullptr;
 
 Window::Window(const char* title, int width, int height) {
@@ -100,12 +102,10 @@ void Window::ProcessEvents() {
         switch (event.type) {
             case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
             case SDL_EVENT_QUIT:
-                Dispatch(WindowCloseEvent());
                 EmitEvent(WindowCloseEvent{});
                 break;
             case SDL_EVENT_KEY_DOWN:
                 if (event.key.scancode == SDL_SCANCODE_ESCAPE) {
-                    Dispatch(WindowCloseEvent());
                     EmitEvent(WindowCloseEvent{});
                 }
                 if (event.key.scancode == SDL_SCANCODE_F11) {
@@ -125,7 +125,6 @@ void Window::ProcessEvents() {
                         width,
                         height);
                     auto event = WindowResizeEvent(static_cast<unsigned int>(m_width), static_cast<unsigned int>(m_height));
-                    Dispatch(event);
                     EmitEvent(event);
                     SDL_SetWindowRelativeMouseMode(m_handle, true);
                     SDL_Rect boundaries = {0, 0, m_width, m_height};
@@ -152,3 +151,4 @@ void Window::Destroy() const {
         SDL_DestroyWindow(m_handle);
 }
 
+}

sandbox/src/main.cpp

@@ -19,8 +19,12 @@
 #include "engine/components/rotate.h"
 #include "engine/components/batch.h"
 
+#include "engine/scene/scene.h"
+
 #include "engine/api.h"
 
+using namespace Engine;
+
 class Game : public IApplication {
 public:
     Game() {}
@@ -30,49 +34,49 @@ public:
         m_scene = scene;
 
         Object* lightObj = Object::LoadFile("./assets/common/sphere/sphere.obj");
-        const auto lght = scene->m_registry.create();
+        lightEntity = scene->CreateEntity();
-        scene->m_registry.emplace<transform>(lght, glm::vec3(5.f, 5.f, 5.f), glm::vec3(0.f));
+        lightEntity.AddComponent<transform>(glm::vec3(5.f, 5.f, 5.f), glm::vec3(0.f));
-        scene->m_registry.emplace<light>(lght, light::LightType::DIRECTIONAL, glm::vec3(1.f, 1.f, 1.f), 1.5f);
+        lightEntity.AddComponent<light>(light::LightType::DIRECTIONAL, glm::vec3(1.f, 1.f, 1.f), 1.5f);
-        scene->m_registry.emplace<mesh>(lght, std::shared_ptr<Object>(lightObj));
+        lightEntity.AddComponent<mesh>(std::shared_ptr<Object>(lightObj));
 
-        const auto cameraEntity = scene->m_registry.create();
+        cameraEntity = scene->CreateEntity();
-        scene->m_registry.emplace<transform>(cameraEntity, glm::vec3(0.f, 2.f, 2.f));
+        cameraEntity.AddComponent<camera>();
-        scene->m_registry.emplace<camera>(cameraEntity);
+        cameraEntity.AddComponent<transform>(glm::vec3(0.f, 2.f, 2.f));
 
         Object* targetObj = Object::LoadFile("./assets/wizard/wizard.obj");
-        const auto targetEntity = scene->m_registry.create();
+        modelEntity = scene->CreateEntity();
-        scene->m_registry.emplace<transform>(targetEntity, glm::vec3(0.f, 0.0f, 0.f));
+        modelEntity.AddComponent<transform>(glm::vec3(0.f, 0.0f, 0.f));
-        scene->m_registry.emplace<mesh>(targetEntity, std::shared_ptr<Object>(targetObj));
+        modelEntity.AddComponent<mesh>(std::shared_ptr<Object>(targetObj));
-        scene->m_registry.emplace<rotate>(targetEntity);
+        modelEntity.AddComponent<rotate>();
 
-        Object* grass = Object::LoadFile("./assets/common/cube/cube.obj");
+        // Object* grass = Object::LoadFile("./assets/common/cube/cube.obj");
-        const auto cubeEntity = scene->m_registry.create();
+        // const auto cubeEntity = scene->m_registry.create();
-        scene->m_registry.emplace<transform>(cubeEntity, glm::vec3(-1.5f, 0.4f, 0.f));
+        // scene->m_registry.emplace<transform>(cubeEntity, glm::vec3(-1.5f, 0.4f, 0.f));
-        scene->m_registry.emplace<mesh>(cubeEntity, std::shared_ptr<Object>(grass));
+        // scene->m_registry.emplace<mesh>(cubeEntity, std::shared_ptr<Object>(grass));
 
         // Cube template (use shared object to avoid reloading 1000 times)
         std::shared_ptr<Object> cubeObj = std::shared_ptr<Object>(Object::LoadFile("./assets/grass_block/grass_block.obj"));
-        const auto batchEntt = scene->m_registry.create();
+        auto batchEntt = scene->CreateEntity();
-        scene->m_registry.emplace<batch>(batchEntt);
+        auto cubeBatch = batchEntt.AddComponent<batch>();
-        scene->m_registry.emplace<mesh>(batchEntt, cubeObj);
+        batchEntt.AddComponent<mesh>(cubeObj);
-        auto cubeBatch = scene->m_registry.get<batch>(batchEntt);
+        // auto cubeBatch = scene->m_registry.get<batch>(batchEntt);
         // Generate 1000 random cubes
         for (int i = 0; i < 1000; ++i) {
-            const auto cubeEntity = scene->m_registry.create();
+            auto cubeEntity = scene->CreateEntity();
 
             float x = static_cast<float>(rand()) / RAND_MAX * 200.f - 100.f; // range [-100, 100]
             float y = static_cast<float>(rand()) / RAND_MAX * 10.f;          // range [0, 10]
             float z = static_cast<float>(rand()) / RAND_MAX * 200.f - 100.f; // range [-100, 100]
 
-            scene->m_registry.emplace<transform>(cubeEntity, glm::vec3(x, y, z));
+            cubeEntity.AddComponent<transform>(glm::vec3(x, y, z));
-            scene->m_registry.emplace<rotate>(cubeEntity);
+            cubeEntity.AddComponent<rotate>();
-            scene->m_registry.emplace<batch::item>(cubeEntity, cubeBatch.id());
+            cubeEntity.AddComponent<batch::item>(cubeBatch.id());
         }
 
         Object* floorObj = Object::LoadFile("./assets/common/plane/plane.obj");
-        const auto floorEntt = scene->m_registry.create();
+        auto floorEntt = scene->CreateEntity();
-        scene->m_registry.emplace<transform>(floorEntt, glm::vec3(0.f));
+        floorEntt.AddComponent<transform>(glm::vec3(0.f));
-        scene->m_registry.emplace<mesh>(floorEntt, std::shared_ptr<Object>(floorObj));
+        floorEntt.AddComponent<mesh>(std::shared_ptr<Object>(floorObj));
 
         std::cout << "Game initialized" << std::endl;
 
@@ -130,11 +134,9 @@ public:
         if (state[SDL_SCANCODE_SPACE]) velocity.y += 1.f;
         if (state[SDL_SCANCODE_LSHIFT]) velocity.y -= 1.f;
 
-        auto view = m_scene->m_registry.view<camera, transform>();
+        auto camTransform = cameraEntity.GetComponent<transform>();
-        for (auto [cam, camTransform] : view.each()) {
         camTransform.position += velocity * deltaTime * 2.5f; // speed is e.g. 2.5f
         camTransform.rotation = cameraViewDirection;
-        }
 
         // update rotation
         if (!m_paused) {
@@ -167,8 +169,8 @@ public:
         glm::vec3 sunColor = glm::mix(dayColor, sunsetColor, sunsetFactor);
 
         // Update the directional light in the registry
-        auto lightsView = m_scene->m_registry.view<light, transform>();
+        auto l = lightEntity.GetComponent<light>();
-        for (auto [entity, l, t] : lightsView.each()) {
+        auto t = lightEntity.GetComponent<transform>();
         if (l.type == light::LightType::DIRECTIONAL) {
             // "position" for directional light often stores direction vector
             // If your system instead uses transform.rotation, adjust accordingly
@@ -176,15 +178,14 @@ public:
             l.color = sunColor;
             l.intensity = intensity;
         }
-        }
 
-        auto rotateEntts = m_scene->m_registry.view<transform, rotate>();
+        // auto rotateEntts = m_scene->m_registry.view<transform, rotate>();
-        for (auto [entity, t] : rotateEntts.each()) {
+        // for (auto [entity, t] : rotateEntts.each()) {
-            // auto targetTransform = rotateEntts.get<transform>(entity);
+        //     // auto targetTransform = rotateEntts.get<transform>(entity);
-            if (!m_scene->m_registry.all_of<light>(entity)) {
+        //     if (!m_scene->m_registry.all_of<light>(entity)) {
-                t.rotation.y = m_angle;
+        //         t.rotation.y = m_angle;
-            }
+        //     }
-        }
+        // }
 
         m_frameCount++;
         m_currentTicks = SDL_GetTicks();
@@ -210,6 +211,10 @@ public:
 private:
     std::shared_ptr<Scene> m_scene;
 
+    Entity lightEntity;
+    Entity cameraEntity;
+    Entity modelEntity;
+
     float m_angle;
     Uint64 m_lastTicks;