Added weapon scripting system, added shotgun as example.

Resources/scenes/debugScene.xml

@@ -34,7 +34,7 @@
     </spriteids>
   </map>
   <entities>
-    <player x="7" y="5" weapon="machineGun">
+    <player x="7" y="5" weapon="shotGun">
       <sprite file="sprites/player3Atlas.png" framesize="64.0" directional="true"/>
     </player>
     <entity x="10" y="3" weapon="pistolGun">

Resources/scripts/shotgun_script.lua

@@ -0,0 +1,17 @@
+-- How bullets are produced make sure to generate bullet data, then pass it through createBullet
+function onShoot() 
+	rot = weapon.wielder.rotation
+	data = weapon:genBulletData()
+	for i=1, 10 do
+		spread = math.random(-20, 20)
+		print("direction x: "..data.direction.x.." y: "..data.direction.y);
+		data.direction.x = math.cos(math.rad(rot + spread))
+		data.direction.y = math.sin(math.rad(rot + spread))
+		weapon:createBullet(data)
+	end
+end
+
+-- How the bulllet, target or wielder respond when the bullet hits a target.
+function onHit(target)
+
+end

Resources/weapons/bubblegun.xml

@@ -11,6 +11,21 @@
     </bullet>
   </weapon>
 
+  <weapon name="shotGun" fireSpeed="750.0">
+    <script file="scripts/shotgun_script.lua"/>
+    <sprite file="sprites/machineGunAtlas256.png" animated="true" frameSize="256.0">
+      <size x="55.0" y="55.0"/>
+      <offset x="-30.0" y="0.0"/>
+    </sprite>
+    <bullet sprite="sprites/bullet.png" animated="false" frameSize="64.0">
+      <spread>50</spread>
+      <speed>60.0</speed>
+      <drop>550.0</drop>
+      <size x="10.0" y="10.0"/>
+      <modifier min="0.3" max="1.0"/>
+    </bullet>
+  </weapon>
+
   <weapon name="machineGun" fireSpeed="50.0">
     <sprite file="sprites/machineGunAtlas256.png" animated="true" frameSize="256.0">
       <size x="55.0" y="55.0"/>

YuppleMayham/include/gameplay/scene.h

@@ -38,11 +38,15 @@ protected:
 	void loadDebugStoryScene() { /*not implemented yet*/ }
 
 private:
+
+	void hookSceneEvents();
+	std::shared_ptr<GameActor> getGameActorByID(const unsigned int ID);
+
 	SceneType type;
 	std::shared_ptr<Map> map;
 	//std::shared_ptr<TileSet> tileSet;
 	std::shared_ptr<GameActor> player;
-	std::vector<std::shared_ptr<Entity>> entities;
+	std::unordered_map<unsigned int, std::shared_ptr<GameActor>> entities;
 	std::shared_ptr<Camera> camera;
 	std::shared_ptr<PhysicsEngine> physicsEngine;
 

YuppleMayham/include/gameplay/weapons/weapon.h

@@ -20,9 +20,10 @@ class BulletManager;
 class EventManager;
 class ResourceManager;
 class GameActor;
+class WeaponScript;
 struct WeaponData;
 
-class Weapon : public Entity
+class Weapon : public Entity, public std::enable_shared_from_this<Weapon>
 {
 public:
 	Weapon(const WeaponData* data, const std::shared_ptr<Shader>& weaponShader, const std::shared_ptr<Shader>& bulletShader, ResourceManager* resourceManager);
@@ -30,13 +31,12 @@ public:
 	void setWielder(const std::shared_ptr<GameActor>& wielder) { this->wielder = wielder; }
 
 	void addComponent(const std::shared_ptr<Component>& component);
+	void attachScript(const std::shared_ptr<WeaponScript>& script);
 	void hookEventManager(const std::shared_ptr<EventManager>& eventManager);
 	void shoot();
 	void update(float deltaTime);
 	void render(const std::shared_ptr<Camera>& camera);
 
-private:
-
 	struct BulletData {
 		glm::vec3 origin;
 		glm::vec2 direction;
@@ -45,12 +45,22 @@ private:
 		float speedMod;
 		float dropMod;
 	};
+	void onHitCallback(std::shared_ptr<GameActor> target);
 
+	glm::vec2					getWeaponSize()		const { return weaponSize; }
+	// This is the offset from the center right point of the weapon to the barrel of the gun defined in 
+	// the XML file for the weapon
+	glm::vec2					getWeaponOffset()	const { return weaponOffset; }
+	float						getBulletSpeed()	const { return bulletSpeed; }
+	glm::vec2					getBulletSize()		const { return bulletSize; }
+	std::shared_ptr<GameActor>	getWielder()		const { return wielder; }
+
+	Weapon::BulletData			genBulletData	();
+	void						createBullet	(const BulletData& data);
+
+private:
 	void adjustWeapon();
 
-	BulletData genBulletData();
-	std::shared_ptr<Bullet> createBullet(const BulletData& data);
-
 	glm::vec2 weaponSize;
 	glm::vec2 weaponOffset;
 
@@ -73,6 +83,7 @@ private:
 	Direction lastDir;
 
 	std::vector <std::shared_ptr<Component>> components;
+	std::shared_ptr<WeaponScript> weaponScript;
 	
 };
 

YuppleMayham/include/utility/resourcemanager.h

@@ -13,6 +13,7 @@ class Shader;
 class Weapon;
 class Script;
 class AIScript;
+class WeaponScript;
 class TileSet;
 class SpriteComponent;
 
@@ -30,6 +31,7 @@ public:
 	std::shared_ptr<Sprite>			loadSpriteDirAnimated	(const std::string& path, float frameSize);
 	std::shared_ptr<Sprite>			loadSpriteStatic		(const std::string& path);
 	std::shared_ptr<AIScript>		loadAIScript			(const std::string& path);
+	std::shared_ptr<WeaponScript>	loadWeaponScript		(const std::string& path);
 	std::shared_ptr<TileSet>		loadTileSet				(const std::string& path, float frameSize);
 
 	std::shared_ptr<Shader>		loadShader	(const std::string& name, const std::string& vertexPath, const std::string& fragPath);

YuppleMayham/include/utility/script.h

@@ -21,7 +21,7 @@ private:
 		}
 		return result.valid();
 	}
-	virtual void registerUserTypes() {};
+	void registerGlobalUserTypes();
 };
 
 class AIScript : public Script {
@@ -30,7 +30,14 @@ public:
 
 private:
 
-	virtual void registerUserTypes() override;
+	void registerUserTypes() ;
+};
+
+class WeaponScript : public Script {
+public:
+	WeaponScript(const std::string& path) : Script(path) { registerUserTypes(); }
+private:
+	void registerUserTypes() ;
 };
 
 #endif // _H_SCRIPT_H

YuppleMayham/include/utility/xmlloader.h

@@ -37,6 +37,7 @@ struct SceneData {
 struct WeaponData {
 	std::string name;
 	float fireSpeed = 250.0f;
+	std::string script = "";
 	std::string sprite;
 	bool animated = false;
 	float frameSize;

YuppleMayham/src/gameplay/scene.cpp

@@ -103,7 +103,7 @@ void Scene::loadDebugShooterScene()
 				entity->addComponent(std::make_shared<AIComponent>(ai));
 			}
 		}
-		entities.push_back(entity);
+		entities.emplace(entity->getActorID(), entity);
 	}
 
 	physicsEngine->loadCollisionMap(map->getCollisionMap(), sceneData->map.tileSize);
@@ -118,7 +118,7 @@ std::shared_ptr<GameActor> Scene::getPlayer() const
 
 void Scene::update(float deltaTime)
 {
-	for (auto& e : entities)
+	for (auto& [id, e] : entities)
 	{
 		e->update(deltaTime);
 		if (camera->getTarget() == e.get())
@@ -131,7 +131,7 @@ void Scene::update(float deltaTime)
 void Scene::render()
 {
 	map->render(camera);
-	for (auto& e : entities)
+	for (auto& [id, e] : entities)
 	{
 		e->render(camera);
 	}
@@ -143,3 +143,21 @@ void Scene::unloadScene()
 	//xmlLoader.reset();
 }
 
+void Scene::hookSceneEvents()
+{
+	eventManager->subscribe("OnBulletCollide", [this](std::shared_ptr<Event> e) {
+		auto collideEvent = std::static_pointer_cast<BulletCollideEvent>(e);
+		std::shared_ptr<GameActor> shooter = getGameActorByID(collideEvent->ownerID);
+		std::shared_ptr<GameActor> target  = getGameActorByID(collideEvent->victimID);
+		if (shooter && target)
+			shooter->getHeldWeapon()->onHitCallback(target);
+	});
+}
+
+std::shared_ptr<GameActor> Scene::getGameActorByID(const unsigned int ID)
+{
+	auto iterator = entities.find(ID);
+	if (iterator == entities.end())
+		return nullptr;
+	return iterator->second;
+}

YuppleMayham/src/gameplay/weapons/bulletmanager.cpp

@@ -44,8 +44,8 @@ void BulletManager::update(float deltaTime)
 	{
 		if (!bullet) continue;
 		bullet->update(deltaTime);
-		float distance = glm::distance(bullet->getPosition(), bullet->getBulletOrigin());
+		float distance = glm::distance(bullet->getPhysicsComponent()->rigidBody.position, bullet->getBulletOrigin());
-		if (distance > bullet->getBulletDrop())
+		if (distance > bullet->getBulletDrop() || glm::length(bullet->getPhysicsComponent()->rigidBody.velocity) < 100.0f)
 		{
 			if (eventManager)
 				eventManager->notify(std::make_shared<BulletDiedEvent>(bullet->getPhysicsComponent()));

YuppleMayham/src/gameplay/weapons/weapon.cpp

@@ -1,17 +1,19 @@
 #include "gameplay/weapons/weapon.h"
-#include "utility/resourcemanager.h"
 #include "gameplay/weapons/bulletmanager.h"
 #include "gameplay/weapons/bullet.h"
 #include "gameplay/gameactor.h"
-#include "utility/component.h"
-#include "utility/events.h"
 #include "gameplay/physics.h"
 #include <SDL_timer.h>
 
 #include "utility/debugdraw.h"
+#include "utility/component.h"
+#include "utility/events.h"
+#include "utility/resourcemanager.h"
+#include "utility/script.h"
 
 // TODO: Regular clean up, make this mess readable!
 // TODO: Attach script to weapons, create custom shoot scripts, allowing the addition of shotguns and other whacky things
+// TODO: Finally just allow the XMLLoader to read the weaponscript supplied and load it into the weapon
 
 Weapon::Weapon(const WeaponData* data, const std::shared_ptr<Shader>& weaponShader, const std::shared_ptr<Shader>& bulletShader, ResourceManager* resourceManager)
 	: 
@@ -51,10 +53,21 @@ void Weapon::shoot()
 	{
 		Uint32 currentTime = SDL_GetTicks();
 		if (currentTime - lastFireTime >= fireSpeed)
+		{
+			if (!weaponScript || !weaponScript->lua["onShoot"].valid())
 			{
 				// create bullet using this generated data
 				BulletData b = genBulletData();
-			bulletManager->addBullet(createBullet(b));
+				createBullet(b);
+			}
+			else {
+				auto result = weaponScript->lua["onShoot"]();
+				if (!result.valid())
+				{
+					sol::error err = result;
+					std::cerr << "lua error: " << err.what() << std::endl;
+				}
+			}
 			lastFireTime = currentTime;
 		}
 	}
@@ -66,6 +79,26 @@ void Weapon::hookEventManager(const std::shared_ptr<EventManager>& eventManager)
 	bulletManager->hookEventManager(eventManager);
 }
 
+void Weapon::attachScript(const std::shared_ptr<WeaponScript>& script)
+{
+	weaponScript = script;
+	weaponScript->lua["weapon"] = shared_from_this();
+	std::cout << "weapon state bound" << std::endl;
+}
+
+void Weapon::onHitCallback(std::shared_ptr<GameActor> target)
+{
+	if (weaponScript && weaponScript->lua["onHit"].valid())
+	{
+		auto result = weaponScript->lua["onHit"](target);
+		if (!result.valid())
+		{
+			sol::error err = result;
+			std::cerr << "lua error: " << err.what() << std::endl;
+		}
+	}
+}
+
 void Weapon::update(float deltaTime)
 {
 	Entity::update(deltaTime);
@@ -130,7 +163,7 @@ Weapon::BulletData Weapon::genBulletData()
 	b.speedMod = bulletModifer->genFloat();
 	b.dropMod = bulletModifer->genFloat();
 
-	float radius = wielder->getScale().x + (weaponSize.x * 0.5) + weaponOffset.x;
+	double radius = wielder->getScale().x + (weaponSize.x * 0.5) + weaponOffset.x;
 
 	b.origin = glm::vec3(
 		// x offset from the wielder
@@ -144,7 +177,7 @@ Weapon::BulletData Weapon::genBulletData()
 	return b;
 }
 
-std::shared_ptr<Bullet> Weapon::createBullet(const Weapon::BulletData& data)
+void Weapon::createBullet(const Weapon::BulletData& data)
 {
 	auto bullet = std::make_shared<Bullet>(wielder->getActorID(), bulletShader, data.origin, data.direction, bulletSpeed, bulletDrop, bulletSize);
 	bullet->addComponent(bulletSprite);
@@ -153,6 +186,6 @@ std::shared_ptr<Bullet> Weapon::createBullet(const Weapon::BulletData& data)
 
 	if (eventManager)
 		eventManager->notify(std::make_shared<BulletFiredEvent>(bullet));
-	return bullet;
+	bulletManager->addBullet(bullet);
 }
 

YuppleMayham/src/utility/resourcemanager.cpp

@@ -37,6 +37,11 @@ std::shared_ptr<AIScript> ResourceManager::loadAIScript(const std::string& path)
 	return std::make_shared<AIScript>(path.c_str());
 }
 
+std::shared_ptr<WeaponScript> ResourceManager::loadWeaponScript(const std::string& path)
+{
+	return std::make_shared<WeaponScript>(path.c_str());
+}
+
 std::shared_ptr<TileSet> ResourceManager::loadTileSet(const std::string& path, float frameSize)
 {
 	auto iterator = tileSets.find(path);
@@ -57,9 +62,15 @@ std::shared_ptr<Shader> ResourceManager::loadShader(const std::string& name, con
 	return shader;
 }
 
+// We attach our script after we create our weapon because we are passing a reference to the weapon into the script and we don't want to pass an
+// incomplete reference to our script.
 std::shared_ptr<Weapon> ResourceManager::loadWeapon(const std::string& name, std::shared_ptr<Shader> weaponShader, std::shared_ptr<Shader> shader)
 {
-	return std::make_shared<Weapon>(xmlLoader->getWeaponDataByName(name.c_str()), weaponShader, shader, this);
+	const WeaponData* data = xmlLoader->getWeaponDataByName(name.c_str());
+	auto weapon = std::make_shared<Weapon>(data, weaponShader, shader, this);
+	if (!data->script.empty())
+		weapon->attachScript(loadWeaponScript(data->script));
+	return weapon;
 }
 
 std::shared_ptr<SceneData> ResourceManager::loadScene(const std::string& id)

YuppleMayham/src/utility/script.cpp

@@ -2,27 +2,21 @@
 #include "gameplay/gameactor.h"
 #include "gameplay/physics.h"
 #include "gameplay/ai.h"
+#include "gameplay/weapons/weapon.h"
 #include "utility/raycaster.h"
 
-void AIScript::registerUserTypes() 
+void Script::registerGlobalUserTypes()
 {
+	// These usertypes are constant for every script
 	lua.new_usertype<glm::vec3>("vec3",
 		sol::constructors<glm::vec3(), glm::vec3(float, float, float)>(),
 		"x", &glm::vec3::x,
 		"y", &glm::vec3::y,
 		"z", &glm::vec3::z);
-	lua["AIState"] = lua.create_table_with(
+	lua.new_usertype<glm::vec2>("vec2",
-		"Idle", AIState::Idle,
+		sol::constructors<glm::vec2(), glm::vec2(float, float)>(),
-		"Patrol", AIState::Patrol,
+		"x", &glm::vec2::x,
-		"Alert", AIState::Alert
+		"y", &glm::vec2::y);
-	);
-	lua.new_usertype<AI>("AI",
-		"state", sol::property(&AI::getState, &AI::setState));
-	lua.new_usertype<Raycaster>("Raycaster",
-		"performRaycast", &Raycaster::performRaycast,
-		"bresenhamRaycast", &Raycaster::bresenhamRaycast,
-		"distFromWall", &Raycaster::getDistanceFromWall,
-		"tileSize", &Raycaster::getTileSize);
 	lua.new_usertype<GameActor>("GameActor",
 		// properties
 		"position", sol::property(&GameActor::getCenter, &GameActor::setPosition),
@@ -43,8 +37,44 @@ void AIScript::registerUserTypes()
 		"applyForce", &PhysicsComponent::RigidBody::applyForce);
 }
 
+void AIScript::registerUserTypes() 
+{
+	lua["AIState"] = lua.create_table_with(
+		"Idle", AIState::Idle,
+		"Patrol", AIState::Patrol,
+		"Alert", AIState::Alert
+	);
+	lua.new_usertype<AI>("AI",
+		"state", sol::property(&AI::getState, &AI::setState));
+	lua.new_usertype<Raycaster>("Raycaster",
+		"performRaycast", &Raycaster::performRaycast,
+		"bresenhamRaycast", &Raycaster::bresenhamRaycast,
+		"distFromWall", &Raycaster::getDistanceFromWall,
+		"tileSize", &Raycaster::getTileSize);
+}
+
+void WeaponScript::registerUserTypes()
+{
+	lua.new_usertype<Weapon>("Weapon",
+		"weaponSize", sol::property(&Weapon::getWeaponSize),
+		"weaponOffset", sol::property(&Weapon::getWeaponOffset),
+		"bulletSize", sol::property(&Weapon::getBulletSize),
+		"bulletSpeed", sol::property(&Weapon::getBulletSpeed),
+		"wielder", sol::property(&Weapon::getWielder),
+		"genBulletData", &Weapon::genBulletData,
+		"createBullet", &Weapon::createBullet);
+	lua.new_usertype<Weapon::BulletData>("BulletData",
+		"origin", &Weapon::BulletData::origin,
+		"direction", &Weapon::BulletData::direction,
+		"mass", &Weapon::BulletData::mass,
+		"sizeMod", &Weapon::BulletData::sizeMod,
+		"speedMod", &Weapon::BulletData::speedMod,
+		"dropMod", &Weapon::BulletData::dropMod);
+}
+
 Script::Script(const std::string& path)
 {
 	lua.open_libraries(sol::lib::base, sol::lib::math);
+	registerGlobalUserTypes();
 	loadScript(path);
 }

YuppleMayham/src/utility/xmlloader.cpp

@@ -207,11 +207,17 @@ bool XMLLoader::loadWeapons(const char* weaponFolder)
 		{
 			// populate weapon data into this temp buffer, then push it into our list of weapons
 			WeaponData data;
-			const char* name, * sprite, * bulletSprite;
+			const char* name, * sprite, * bulletSprite, * script;
 			// Getting top level weapon data, attribs in the weapon Node
 			if (weapon->QueryStringAttribute("name", &name) != tinyxml2::XML_SUCCESS)
 				continue;
 			weapon->QueryFloatAttribute("fireSpeed", &data.fireSpeed);
+			// Getting script file if Node exists
+			tinyxml2::XMLElement* wepScript = weapon->FirstChildElement("script");
+			if (wepScript)
+				wepScript->QueryStringAttribute("file", &script);
+			else
+				script = "";
 			// Getting weapon sprite information, held in the sprite node
 			tinyxml2::XMLElement* wepSprite = weapon->FirstChildElement("sprite");
 			if (wepSprite)
@@ -248,6 +254,7 @@ bool XMLLoader::loadWeapons(const char* weaponFolder)
 				continue;
 
 			data.name = name;
+			data.script = script;
 			data.sprite = sprite;
 			data.bulletSprite = bulletSprite;