Magic_Game/core/Manager/SceneManager.cpp

#include "..\emanagers.h"
#include "..\ebase.h"
#include "..\etransitions.h"
#include <stack>

static e2d::Scene * s_pCurrentScene = nullptr;
static e2d::Scene * s_pNextScene = nullptr;
static e2d::Transition * s_pTransition = nullptr;
static std::stack<e2d::Scene*> s_SceneStack;

void e2d::SceneManager::enter(Scene * scene, Transition * transition /* = nullptr */, bool saveCurrentScene /* = true */)
{
	ASSERT(scene != nullptr, "Next scene NULL pointer exception!");
	scene->retain();

	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>
	s_pNextScene = scene;
	
	// <20><><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (transition)
	{
		s_pTransition = transition;
		transition->retain();
		transition->_setTarget(
			s_pCurrentScene,
			s_pNextScene
		);
	}

	if (s_pCurrentScene)
	{
		s_pCurrentScene->m_bWillSave = saveCurrentScene;
	}
}

void e2d::SceneManager::back(Transition * transition /* = nullptr */)
{
	// ջΪ<D5BB><CEAA>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><C3B7>س<EFBFBD><D8B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD><CAA7>
	WARN_IF(s_SceneStack.size() == 0, "Scene stack now is empty!");
	if (s_SceneStack.size() == 0) return;

	// <20><>ջ<EFBFBD><D5BB>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EBA3AC>Ϊ<EFBFBD><CEAA>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>
	s_pNextScene = s_SceneStack.top();
	s_SceneStack.pop();

	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>浱ǰ<E6B5B1><C7B0><EFBFBD><EFBFBD>
	if (s_pCurrentScene)
	{
		s_pCurrentScene->m_bWillSave = false;
	}

	// <20><><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (transition)
	{
		s_pTransition = transition;
		transition->retain();
		transition->_setTarget(
			s_pCurrentScene,
			s_pNextScene
		);
	}
}

void e2d::SceneManager::clear()
{
	// <20><><EFBFBD>ճ<EFBFBD><D5B3><EFBFBD>ջ
	while (s_SceneStack.size())
	{
		auto temp = s_SceneStack.top();
		SafeRelease(&temp);
		s_SceneStack.pop();
	}
}

e2d::Scene * e2d::SceneManager::getCurrentScene()
{
	return s_pCurrentScene;
}

bool e2d::SceneManager::isTransitioning()
{
	return s_pTransition != nullptr;
}

void e2d::SceneManager::__update()
{
	// <20><><EFBFBD>³<EFBFBD><C2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (s_pCurrentScene)
	{
		s_pCurrentScene->_update();
	}

	// <20><><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ִ<EFBFBD>г<EFBFBD><D0B3><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>
	if (s_pTransition)
	{
		// <20><><EFBFBD>³<EFBFBD><C2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		if (s_pNextScene)
		{
			s_pNextScene->_update();
		}
		// <20><><EFBFBD>³<EFBFBD><C2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		s_pTransition->_update();

		if (s_pTransition->isEnding())
		{
			s_pTransition->release();
			s_pTransition = nullptr;
		}
		else
		{
			return;
		}
	}

	// <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>ָ<EFBFBD>벻Ϊ<EBB2BB><CEAA>ʱ<EFBFBD><CAB1><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>
	if (s_pNextScene)
	{
		// ִ<>е<EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD> onExit <20><><EFBFBD><EFBFBD>
		s_pCurrentScene->onExit();

		// <20><>Ҫ<EFBFBD><D2AA><EFBFBD>浱ǰ<E6B5B1><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><D5BB>
		if (s_pCurrentScene->m_bWillSave)
		{
			s_SceneStack.push(s_pCurrentScene);
		}
		else
		{
			SafeRelease(&s_pCurrentScene);
		}

		// ִ<><D6B4><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD> onEnter <20><><EFBFBD><EFBFBD>
		s_pNextScene->onEnter();

		s_pCurrentScene = s_pNextScene;		// <20>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>
		s_pNextScene = nullptr;				// <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD>
	}
}

void e2d::SceneManager::__render()
{
	// <20><><EFBFBD>Ƶ<EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD>
	if (s_pCurrentScene)
	{
		s_pCurrentScene->_render();
	}
	// <20>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ͬʱ<CDAC><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (s_pTransition && s_pNextScene)
	{
		s_pNextScene->_render();
	}
}

bool e2d::SceneManager::__init()
{
	if (!s_pNextScene)
	{
		s_pNextScene = new Scene();
	}

	s_pCurrentScene = s_pNextScene;
	s_pCurrentScene->onEnter();
	s_pNextScene = nullptr;
	return true;
}

void e2d::SceneManager::__uninit()
{
	SafeRelease(&s_pCurrentScene);
	SafeRelease(&s_pNextScene);
	SafeRelease(&s_pTransition);
	SceneManager::clear();
}