173 lines
3.1 KiB
C++
173 lines
3.1 KiB
C++
#include "..\emanagers.h"
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#include "..\ebase.h"
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#include "..\etransitions.h"
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#include <stack>
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static e2d::EScene * s_pCurrentScene = nullptr;
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static e2d::EScene * s_pNextScene = nullptr;
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static e2d::ETransition * s_pTransition = nullptr;
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static std::stack<e2d::EScene*> s_SceneStack;
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void e2d::ESceneManager::enterScene(EScene * scene, ETransition * transition /* = nullptr */, bool saveCurrentScene /* = true */)
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{
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ASSERT(scene != nullptr, "Next scene NULL pointer exception!");
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scene->retain();
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// 保存下一场景的指针
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s_pNextScene = scene;
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// 设置切换场景动画
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if (transition)
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{
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s_pTransition = transition;
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transition->retain();
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transition->_setTarget(
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s_pCurrentScene,
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s_pNextScene
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);
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}
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if (s_pCurrentScene)
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{
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s_pCurrentScene->m_bWillSave = saveCurrentScene;
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}
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}
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void e2d::ESceneManager::backScene(ETransition * transition /* = nullptr */)
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{
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// 栈为空时，调用返回场景函数失败
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WARN_IF(s_SceneStack.size() == 0, "Scene stack now is empty!");
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if (s_SceneStack.size() == 0) return;
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// 从栈顶取出场景指针，作为下一场景
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s_pNextScene = s_SceneStack.top();
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s_SceneStack.pop();
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// 返回上一场景时，不保存当前场景
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if (s_pCurrentScene)
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{
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s_pCurrentScene->m_bWillSave = false;
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}
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// 设置切换场景动画
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if (transition)
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{
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s_pTransition = transition;
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transition->retain();
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transition->_setTarget(
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s_pCurrentScene,
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s_pNextScene
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);
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}
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}
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void e2d::ESceneManager::clearScene()
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{
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// 清空场景栈
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while (s_SceneStack.size())
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{
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auto temp = s_SceneStack.top();
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SafeRelease(&temp);
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s_SceneStack.pop();
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}
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}
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e2d::EScene * e2d::ESceneManager::getCurrentScene()
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{
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return s_pCurrentScene;
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}
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bool e2d::ESceneManager::isTransitioning()
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{
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return s_pTransition != nullptr;
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}
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void e2d::ESceneManager::__update()
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{
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// 更新场景内容
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if (s_pCurrentScene)
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{
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s_pCurrentScene->_update();
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}
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// 正在切换场景时，执行场景切换动画
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if (s_pTransition)
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{
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// 更新场景内容
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if (s_pNextScene)
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{
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s_pNextScene->_update();
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}
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// 更新场景动画
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s_pTransition->_update();
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if (s_pTransition->isEnding())
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{
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s_pTransition->release();
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s_pTransition = nullptr;
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}
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else
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{
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return;
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}
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}
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// 下一场景指针不为空时，切换场景
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if (s_pNextScene)
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{
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// 执行当前场景的 onExit 函数
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s_pCurrentScene->onExit();
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// 若要保存当前场景，把它放入栈中
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if (s_pCurrentScene->m_bWillSave)
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{
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s_SceneStack.push(s_pCurrentScene);
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}
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else
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{
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SafeRelease(&s_pCurrentScene);
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}
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// 执行下一场景的 onEnter 函数
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s_pNextScene->onEnter();
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s_pCurrentScene = s_pNextScene; // 切换场景
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s_pNextScene = nullptr; // 下一场景置空
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}
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}
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void e2d::ESceneManager::__render()
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{
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// 绘制当前场景
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if (s_pCurrentScene)
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{
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s_pCurrentScene->_render();
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}
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// 切换场景时，同时绘制两场景
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if (s_pTransition && s_pNextScene)
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{
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s_pNextScene->_render();
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}
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}
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bool e2d::ESceneManager::__init()
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{
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if (!s_pNextScene)
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{
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s_pNextScene = new EScene();
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}
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s_pCurrentScene = s_pNextScene;
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s_pCurrentScene->onEnter();
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s_pNextScene = nullptr;
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return true;
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}
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void e2d::ESceneManager::__uninit()
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{
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SafeRelease(&s_pCurrentScene);
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SafeRelease(&s_pNextScene);
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SafeRelease(&s_pTransition);
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ESceneManager::clearScene();
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}
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