Component+Scene: Restructure scene .json to allow multiple components

assets/scene/scene1.json

@@ -1,50 +1,68 @@
 {
 	"init": "assets/lua/scene1-init.lua",
-	"camera": {
+	"entities": [
-		"name": "Camera",
+		{
-		"translate": [ 0.0, 0.0, 1.0 ],
+			"id": { "id": 12312312 },
-		"rotate": [ 0.0, 0.0, -1.0 ],
+			"tag": { "tag": "Camera" },
-		"scale": [ 1.0, 1.0, 1.0 ],
+			"transform" : {
-		"type": "perspective",
+				"translate": [0.0, 0.0, 1.0],
-		"script": {
+				"rotate": [0.0, 0.0, -1.0],
-			"type": "lua",
+				"scale": [1.0, 1.0, 1.0]
-			"name": "assets/lua/cameracontroller.lua"
+			},
-		}
+			"camera": { "type": "perspective" },
+			"lua-scripts": [
+				{ "path": "assets/lua/cameracontroller.lua" }
+			]
 		},
-	"quad": [
 		{
-			"name": "Quad",
+			"id": { "id": 564564564 },
+			"tag": { "tag": "Quad" },
+			"transform" : {
 				"translate": [ 0.0, 0.0, 0.0 ],
 				"rotate": [ 0.0, 0.0, 0.0 ],
-			"scale": [ 1.0, 1.0, 1.0 ],
+				"scale": [ 1.0, 1.0, 1.0 ]
+			},
+			"sprite": {
 				"color": [ 1.0, 1.0, 1.0, 1.0 ],
 				"texture": "assets/gfx/test.png"
+			}
 		},
 		{
-			"name": "Quad 2",
+			"id": { "id": 97897897 },
+			"tag": { "tag": "Quad 2" },
+			"transform" : {
 				"translate": [ 1.1, 0.0, 0.0 ],
 				"rotate": [ 0.0, 0.0, 0.0 ],
-			"scale": [ 1.0, 1.0, 1.0 ],
+				"scale": [ 1.0, 1.0, 1.0 ]
+			},
+			"sprite": {
 				"color": [ 0.5, 0.6, 0.8, 1.0 ],
 				"texture": "assets/gfx/test.png"
+			}
 		},
 		{
-			"name": "Quad 3",
+			"id": { "id": 3424242 },
+			"tag": { "tag": "Quad 3" },
+			"transform" : {
 				"translate": [ 2.2, 0.0, 0.0 ],
 				"rotate": [ 0.0, 0.0, 0.0 ],
-			"scale": [ 1.0, 1.0, 1.0 ],
+				"scale": [ 1.0, 1.0, 1.0 ]
+			},
+			"sprite": {
 				"color": [ 1.0, 1.0, 1.0, 1.0 ],
 				"texture": "assets/gfx/test-inverted.png"
 			}
-	],
+		},
-	"text": [
 		{
-			"name": "Text",
+			"id": { "id": 675754 },
+			"tag": { "tag": "Text" },
+			"text": {
 				"content": "Hello World!",
 				"font": "assets/fnt/open-sans",
 				"font-size": 24,
 				"line-spacing": 1.0,
 				"width": 150
 			}
+		}
 	]
 }

src/inferno/component/cameracomponent.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ruc/format/print.h"
+#include "ruc/json/json.h"
+
+#include "inferno/component/cameracomponent.h"
+
+namespace Inferno {
+
+void fromJson(const ruc::Json& json, CameraComponent& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Object);
+
+	if (json.exists("type")) {
+		value.type = json.at("type").get<std::string>() == "orthographic" ? CameraType::Orthographic : CameraType::Perspective;
+	}
+	if (json.exists("zoom-level")) {
+		json.at("zoom-level").getTo(value.zoomLevel);
+	}
+}
+
+} // namespace Inferno

src/inferno/component/cameracomponent.h

@@ -8,6 +8,7 @@
 
 #include "glm/ext/matrix_float4x4.hpp" // glm::mat4
 #include "glm/ext/vector_float3.hpp"   // glm::vec3
+#include "ruc/json/json.h"
 
 namespace Inferno {
 
@@ -32,4 +33,6 @@ struct CameraComponent {
 	glm::mat4 projection { 1.0f }; // Identity matrix
 };
 
+void fromJson(const ruc::Json& json, CameraComponent& value);
+
 } // namespace Inferno

src/inferno/component/id-component.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ruc/json/json.h"
+
+#include "inferno/component/id-component.h"
+
+namespace Inferno {
+
+void fromJson(const ruc::Json& json, IDComponent& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Object);
+
+	if (json.exists("id")) {
+		json.at("id").getTo(value.id);
+	}
+}
+
+} // namespace Inferno

src/inferno/component/id-component.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include "ruc/json/json.h"
+
+#include "inferno/uid.h"
+
+namespace Inferno {
+
+struct IDComponent {
+	UID id;
+
+	IDComponent() = default;
+	IDComponent(UID id)
+		: id(id)
+	{
+	}
+	IDComponent(const IDComponent&) = default;
+};
+
+void fromJson(const ruc::Json& json, IDComponent& value);
+
+} // namespace Inferno

src/inferno/component/luascriptcomponent.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ruc/json/json.h"
+
+#include "inferno/component/luascriptcomponent.h"
+
+namespace Inferno {
+
+void fromJson(const ruc::Json& json, LuaScriptComponent& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Object);
+
+	VERIFY(json.exists("path"), "path not found");
+	json.at("path").getTo(value.path);
+}
+
+} // namespace Inferno

src/inferno/component/luascriptcomponent.h

@@ -6,9 +6,11 @@
 
 #pragma once
 
-#include <string>  // std::string
+#include <string>
 #include <utility> // std::move
 
+#include "ruc/json/json.h"
+
 namespace Inferno {
 
 class LuaScript;
@@ -24,4 +26,7 @@ struct LuaScriptComponent {
 	{
 	}
 };
+
+void fromJson(const ruc::Json& json, LuaScriptComponent& value);
+
 } // namespace Inferno

src/inferno/component/nativescriptcomponent.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ruc/json/json.h"
+
+#include "inferno/component/nativescriptcomponent.h"
+
+namespace Inferno {
+
+void fromJson(const ruc::Json& json, NativeScriptComponent& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Object);
+
+	VERIFY(json.exists("name"), "name not found");
+	json.at("name").getTo(value.name);
+}
+
+} // namespace Inferno

src/inferno/component/nativescriptcomponent.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <string>
+#include <utility> // std::move
 
 #include "inferno/script/nativescript.h"
 
@@ -14,17 +15,29 @@ namespace Inferno {
 
 struct NativeScriptComponent {
 	NativeScript* instance { nullptr };
+	std::string name;
 
 	NativeScript::InitializeFunction initialize { nullptr };
 	NativeScript::DestroyFunction destroy { nullptr };
 
 	// Dont allow manually setting instance during construction
 	NativeScriptComponent() {}
-	NativeScriptComponent(const std::string& binding)
+	NativeScriptComponent(const std::string& name)
+		: name(std::move(name))
 	{
-		initialize = NativeScriptBinding::the().initializeBinding(binding);
+		bind();
-		destroy = NativeScriptBinding::the().destroyBinding(binding);
+	}
+
+	void bind()
+	{
+		VERIFY(initialize == nullptr && destroy == nullptr, "NativeScript already bound");
+
+		VERIFY(name != "", "name not set");
+		initialize = NativeScriptBinding::the().initializeBinding(name);
+		destroy = NativeScriptBinding::the().destroyBinding(name);
 	}
 };
 
+void fromJson(const ruc::Json& json, NativeScriptComponent& value);
+
 } // namespace Inferno

src/inferno/component/tagcomponent.cpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ruc/json/json.h"
+
+#include "inferno/component/tagcomponent.h"
+
+namespace Inferno {
+
+void fromJson(const ruc::Json& json, TagComponent& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Object);
+
+	if (json.exists("tag")) {
+		json.at("tag").getTo(value.tag);
+	}
+}
+
+} // namespace Inferno

src/inferno/component/tagcomponent.h

@@ -9,6 +9,8 @@
 #include <string>  // std::string
 #include <utility> // std::move
 
+#include "ruc/json/json.h"
+
 namespace Inferno {
 
 struct TagComponent {
@@ -23,4 +25,6 @@ struct TagComponent {
 	operator const std::string&() const { return tag; }
 };
 
+void fromJson(const ruc::Json& json, TagComponent& value);
+
 } // namespace Inferno

src/inferno/scene/scene.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: MIT
  */
 
+#include <cstddef> // size_t
 #include <cstdint> // uint32_t
 #include <limits>  // std::numeric_limits
 
@@ -13,6 +14,7 @@
 #include "ruc/meta/assert.h"
 
 #include "inferno/component/cameracomponent.h"
+#include "inferno/component/id-component.h"
 #include "inferno/component/luascriptcomponent.h"
 #include "inferno/component/nativescriptcomponent.h"
 #include "inferno/component/spritecomponent.h"
@@ -26,6 +28,7 @@
 #include "inferno/system/scriptsystem.h"
 #include "inferno/system/textareasystem.h"
 #include "inferno/system/transformsystem.h"
+#include "inferno/uid.h"
 
 namespace Inferno {
 
@@ -47,54 +50,66 @@ void Scene::initialize()
 
 	auto sceneJson = ruc::Json::parse(ruc::File("assets/scene/scene1.json").data());
 
-	// Camera
+	if (sceneJson.exists("init")) {
+		// TODO: load either NativeScript or LuaScript?
+	}
+
+	// Entities
+	// -------------------------------------
+
+	if (sceneJson.exists("entities")) {
+		const auto& entityJson = sceneJson.at("entities");
+		VERIFY(entityJson.type() == ruc::Json::Type::Array);
+		const auto& entities = entityJson.asArray();
+		for (size_t i = 0; i < entities.size(); ++i) {
+
+			uint32_t entity = createEntity();
+
+			VERIFY(entities.at(i).type() == ruc::Json::Type::Object);
+			const auto& components = entities.at(i);
 
-	VERIFY(sceneJson.exists("camera"), "scene doesnt contain a camera");
+			// ID is required
-	auto& cameraJson = sceneJson.at("camera");
+			VERIFY(components.exists("id"), "id not found");
-	uint32_t camera = loadEntity(cameraJson);
+			auto& id = getComponent<IDComponent>(entity);
+			components.at("id").getTo(id);
 
-	auto& cameraComponent = addComponent<CameraComponent>(camera);
+			if (components.exists("tag")) {
-	if (cameraJson.exists("type") && cameraJson.at("type").get<std::string>() == "orthographic") {
+				auto& tag = getComponent<TagComponent>(entity);
-		cameraComponent.type = CameraType::Orthographic;
+				components.at("tag").getTo(tag);
 			}
-	if (cameraJson.exists("zoom-level") && cameraJson.at("zoom-level").type() == ruc::Json::Type::Number) {
+			if (components.exists("transform")) {
-		cameraComponent.zoomLevel = cameraJson.at("zoom-level").asDouble();
+				auto& transform = getComponent<TransformComponent>(entity);
+				components.at("transform").getTo(transform);
 			}
-
+			if (components.exists("camera")) {
-	if (cameraJson.exists("script")) {
+				auto& camera = addComponent<CameraComponent>(entity);
-		auto& cameraScript = cameraJson.at("script");
+				components.at("camera").getTo(camera);
-		if (cameraScript.exists("type") && cameraScript.exists("name")) {
-			auto name = cameraScript.at("name").get<std::string>();
-			if (cameraScript.at("type").get<std::string>() == "lua") {
-				addComponent<LuaScriptComponent>(camera, name);
 			}
-			else {
+			if (components.exists("lua-scripts")) {
-				addComponent<NativeScriptComponent>(camera, name);
+				VERIFY(components.at("lua-scripts").type() == ruc::Json::Type::Array);
+				const auto& scripts = components.at("lua-scripts").asArray();
+				for (size_t j = 0; j < scripts.size(); ++j) {
+					auto& script = addComponent<LuaScriptComponent>(entity);
+					scripts.at(j).getTo(script);
 				}
 			}
+			if (components.exists("native-scripts")) {
+				VERIFY(components.at("native-scripts").type() == ruc::Json::Type::Array);
+				const auto& scripts = components.at("native-scripts").asArray();
+				for (size_t j = 0; j < scripts.size(); ++j) {
+					auto& script = addComponent<NativeScriptComponent>(entity);
+					scripts.at(j).getTo(script);
+					script.bind();
 				}
-
-	// Quads
-
-	if (sceneJson.exists("quad") && sceneJson.at("quad").type() == ruc::Json::Type::Array) {
-		auto& quads = sceneJson.at("quad").asArray().elements();
-		for (const auto& quad : quads) {
-			uint32_t quadEntity = loadEntity(quad);
-			addComponent<SpriteComponent>(quadEntity);
-			auto& spriteComponent = getComponent<SpriteComponent>(quadEntity);
-			quad.getTo(spriteComponent);
 			}
+			if (components.exists("sprite")) {
+				auto& sprite = addComponent<SpriteComponent>(entity);
+				components.at("sprite").getTo(sprite);
+			}
+			if (components.exists("text")) {
+				auto& text = addComponent<TextAreaComponent>(entity);
+				components.at("text").getTo(text);
 			}
-
-	// Text
-
-	if (sceneJson.exists("text") && sceneJson.at("text").type() == ruc::Json::Type::Array) {
-		auto& texts = sceneJson.at("text").asArray().elements();
-		for (const auto& text : texts) {
-			uint32_t textEntity = loadEntity(text);
-			addComponent<TextAreaComponent>(textEntity);
-			auto& textAreaComponent = getComponent<TextAreaComponent>(textEntity);
-			text.getTo(textAreaComponent);
 		}
 	}
 
@@ -125,20 +140,15 @@ void Scene::destroy()
 
 uint32_t Scene::createEntity(const std::string& name)
 {
-	uint32_t entity = static_cast<uint32_t>(m_registry->create());
+	return createEntityWithUID(UID(), name);
-	addComponent<TagComponent>(entity, name.empty() ? "Unnamed Entity" : name);
-	addComponent<TransformComponent>(entity);
-
-	return entity;
 }
 
-uint32_t Scene::loadEntity(ruc::Json json)
+uint32_t Scene::createEntityWithUID(UID id, const std::string& name)
 {
-	uint32_t entity = createEntity((json.exists("name"))
+	uint32_t entity = static_cast<uint32_t>(m_registry->create());
-	                                   ? json.at("name").get<std::string>()
+	addComponent<IDComponent>(entity, id);
-	                                   : "");
+	addComponent<TagComponent>(entity, name.empty() ? "Unnamed Entity" : name);
-	auto& transform = getComponent<TransformComponent>(entity);
+	addComponent<TransformComponent>(entity);
-	json.getTo(transform);
 
 	return entity;
 }

src/inferno/scene/scene.h

@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <cstddef> // size_t
 #include <cstdint> // uint32_t
 #include <memory>  // std::shared_ptr
 
@@ -14,6 +15,8 @@
 #include "ruc/format/format.h"
 #include "ruc/json/json.h"
 
+#include "inferno/uid.h"
+
 namespace Inferno {
 
 class Camera;
@@ -27,7 +30,7 @@ public:
 	void destroy();
 
 	uint32_t createEntity(const std::string& name = "");
-	uint32_t loadEntity(ruc::Json json);
+	uint32_t createEntityWithUID(UID id, const std::string& name = "");
 	uint32_t findEntity(std::string_view name);
 	void destroyEntity(uint32_t entity);
 
@@ -49,7 +52,8 @@ public:
 		return m_registry->any<T...>(entt::entity { entity });
 	}
 
-	// @Todo Should replace be allowed? could trigger memory leaks with nativescript
+	// TODO: Should replace be allowed? could trigger memory leaks with nativescript
+	// TODO: Replace will make it so an entity cant have multiple scripts
 	template<typename T, typename... P>
 	T& addComponent(uint32_t entity, P&&... parameters) const
 	{
@@ -64,7 +68,7 @@ public:
 		return m_registry->remove_if_exists<T>(entt::entity { entity });
 	}
 
-	// @Todo Should replace be allowed? could trigger memory leaks with nativescript
+	// TODO: Should replace be allowed? could trigger memory leaks with nativescript
 	template<typename T, typename... P>
 	T& getComponent(uint32_t entity, P&&... parameters) const
 	{

src/inferno/script/nativescript.h

@@ -55,8 +55,8 @@ public:
 		m_detroyBindings.emplace(binding, destroy);
 	}
 
-	NativeScript::InitializeFunction initializeBinding(const std::string& binding) { return m_initializeBindings[binding]; }
+	NativeScript::InitializeFunction initializeBinding(const std::string& name) { return m_initializeBindings[name]; }
-	NativeScript::DestroyFunction destroyBinding(const std::string& binding) { return m_detroyBindings[binding]; }
+	NativeScript::DestroyFunction destroyBinding(const std::string& name) { return m_detroyBindings[name]; }
 
 private:
 	std::unordered_map<std::string, NativeScript::InitializeFunction> m_initializeBindings;

src/inferno/uid.cpp

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <cstdint>
+#include <random>
+
+#include "ruc/format/log.h"
+#include "ruc/json/json.h"
+
+#include "inferno/uid.h"
+
+namespace Inferno {
+
+static std::random_device s_seed;
+static std::mt19937_64 s_engine(s_seed());
+static std::uniform_int_distribution<uint64_t> s_distribution;
+
+UID::UID()
+	: m_uid(s_distribution(s_engine))
+{
+}
+
+UID::UID(uint64_t uid)
+	: m_uid(uid)
+{
+}
+
+void fromJson(const ruc::Json& json, UID& value)
+{
+	VERIFY(json.type() == ruc::Json::Type::Number);
+
+	value = UID((int64_t)json.asDouble());
+}
+
+} // namespace Inferno

src/inferno/uid.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2023 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <cstdint> // uint64_t
+
+#include "ruc/json/json.h"
+
+namespace Inferno {
+
+class UID {
+public:
+	UID();
+	UID(uint64_t uid);
+
+	// Comparison operator for std::map
+	bool operator<(const UID& other) const
+	{
+		return m_uid < other.m_uid;
+	}
+
+	operator uint64_t() const { return m_uid; }
+
+private:
+	uint64_t m_uid;
+};
+
+void fromJson(const ruc::Json& json, UID& value);
+
+} // namespace Inferno
+
+namespace std {
+
+// Hash function for std::unordered_map
+template<>
+struct hash<Inferno::UID> {
+	size_t operator()(const Inferno::UID& uid) const
+	{
+		return hash<uint64_t>()(static_cast<uint64_t>(uid));
+	}
+};
+
+} // namespace std