OGRE中的 Frame Listeners和Unbuffered Input
FrameListener用于在帧渲染之前和渲染完成之后接收帧事件。
UnbuffereInput则是在帧监听中加入鼠标或是键盘，游戏手柄的判断，然后来做出相应的操作。
主要代码
void TutorialApplication::createScene(void)
{
mSceneMgr->setAmbientLight(Ogre::ColourValue(0.25, 0.25, 0.25));
Ogre::Entity* ninjaEntity = mSceneMgr->createEntity("Ninja", "ninja.mesh");
Ogre::SceneNode *node = mSceneMgr->getRootSceneNode()->createChildSceneNode("NinjaNode");
node->attachObject(ninjaEntity);
Ogre::Light* pointLight = mSceneMgr->createLight("pointLight");
pointLight->setType(Ogre::Light::LT_POINT);
pointLight->setPosition(Ogre::Vector3(250, 150, 250));
pointLight->setDiffuseColour(Ogre::ColourValue::White);
pointLight->setSpecularColour(Ogre::ColourValue::White);
}
//-------------------------------------------------------------------------------------
bool TutorialApplication::processUnbufferedInput(const Ogre::FrameEvent& evt)
{
static bool mMouseDown = false; // 鼠标是否被按下
static Ogre::Real mToggle = 0.0; // 按下的时间
static Ogre::Real mRotate = 0.13; // 旋转常量，设置旋转的快慢
static Ogre::Real mMove = 250; // 运动常量，设置移动的快慢
//利用鼠标左键控制灯光的暗灭
bool currMouse = mMouse->getMouseState().buttonDown(OIS::MB_Left);
if (currMouse && ! mMouseDown)
{
Ogre::Light* light = mSceneMgr->getLight("pointLight");
light->setVisible(! light->isVisible());
}
mMouseDown = currMouse;
//利用按键1来控制灯光
mToggle -= evt.timeSinceLastFrame;
if ((mToggle < 0.0f ) && mKeyboard->isKeyDown(OIS::KC_1))
{
mToggle = 0.5;
Ogre::Light* light = mSceneMgr->getLight("pointLight");
light->setVisible(! light->isVisible());
}
//设置IJKL键
Ogre::Vector3 transVector = Ogre::Vector3::ZERO;
if (mKeyboard->isKeyDown(OIS::KC_I)) // Forward
{
transVector.z -= mMove;
}
if (mKeyboard->isKeyDown(OIS::KC_K)) // Backward
{
transVector.z += mMove;
}
if (mKeyboard->isKeyDown(OIS::KC_J)) // Left - yaw or strafe
{
if(mKeyboard->isKeyDown( OIS::KC_LSHIFT ))
{
// Yaw left
mSceneMgr->getSceneNode("NinjaNode")->yaw(Ogre::Degree(mRotate * 5));
} else {
transVector.x -= mMove; // Strafe left
}
}
if (mKeyboard->isKeyDown(OIS::KC_L)) // Right - yaw or strafe
{
if(mKeyboard->isKeyDown( OIS::KC_LSHIFT ))
{
// Yaw right
mSceneMgr->getSceneNode("NinjaNode")->yaw(Ogre::Degree(-mRotate * 5));
} else {
transVector.x += mMove; // Strafe right
}
}
if (mKeyboard->isKeyDown(OIS::KC_U)) // Up
{
transVector.y += mMove;
}
if (mKeyboard->isKeyDown(OIS::KC_O)) // Down
{
transVector.y -= mMove;
}
mSceneMgr->getSceneNode("NinjaNode")->translate(transVector * evt.timeSinceLastFrame, Ogre::Node::TS_LOCAL);
return true;
}
//-------------------------------------------------------------------------------------
bool TutorialApplication::frameRenderingQueued(const Ogre::FrameEvent& evt)
{
bool ret = BaseApplication::frameRenderingQueued(evt);
if(!processUnbufferedInput(evt)) return false;
return ret;
}
最终效果:
2012-7-16