chap8_1 Render to texture in OGRE

渲染到纹理是个很重要的技巧,特别是做海洋,湖泊这种水体渲染的时候.这里在OGRE实现下,到时候我用DX写一个渲染到纹理的例子,那时再讲原理

/*------------------------------------------------------------main.cpp -- Render to texture demo(c) Seamanj.2013/8/16
------------------------------------------------------------*/
//phase1 : Add Framework
//phase2 : Add environment ,knot mesh and ogrehead
//phase3 : Add a plane;
//phase4 : add a texture
//phase5 : add frame  listener
#define phase1 1
#define phase2 1
#define phase3 1
#define phase4 1
#define phase5 1
#if phase1
#include "ExampleApplication.h"
#include <windows.h>
#if phase5
class MyFrameListener : public ExampleFrameListener
{
protected:Camera* mReflectCam;SceneNode* mPlaneNode;
public:MyFrameListener(RenderWindow* window, Camera* maincam, Camera* reflectCam,SceneNode* planeSceneNode) : ExampleFrameListener(window, maincam),mReflectCam(reflectCam), mPlaneNode(planeSceneNode){}bool frameStarted( const FrameEvent& evt ){if( ExampleFrameListener::frameStarted( evt ) == false )return false;// Make sure reflection camera is updated toomReflectCam->setOrientation( mCamera->getOrientation());mReflectCam->setPosition( mCamera->getPosition());// Rotate plane/// mPlaneNode->yaw(Degree(30 * evt.timeSinceLastFrame), Node::TS_PARENT);return true;}};
#endif
class MyApplication : public ExampleApplication
#if phase5, public RenderTargetListener
#endif
{
#if phase3
protected:MovablePlane* mPlane;Entity* mPlaneEnt;SceneNode* mPlaneNode;
#if phase4Camera* mReflectCam;
#endif
#endif
public:MyApplication()
#if phase3: mPlane(0)
#endif{}~MyApplication(){
#if phase3delete mPlane;
#endif}
protected:
#if phase5void preRenderTargetUpdate(const RenderTargetEvent& evt){// Hide plane mPlaneEnt->setVisible(false);}void postRenderTargetUpdate(const RenderTargetEvent& evt){// Show plane mPlaneEnt->setVisible(true);}
#endifvoid createScene(){
#if phase2// Set ambient lightmSceneMgr->setAmbientLight(ColourValue(0.2, 0.2, 0.2));// Set skyboxmSceneMgr->setSkyBox(true, "Examples/MorningSkyBox");// Create a lightLight* l = mSceneMgr->createLight("MainLight");l->setType(Light::LT_DIRECTIONAL);Vector3 dir(0.5, -1, 0);dir.normalise();l->setDirection(dir);l->setDiffuseColour(1.0f, 1.0f, 0.8f);l->setSpecularColour(1.0f, 1.0f, 1.0f);// Create 3 knotsEntity* knotEnt = mSceneMgr->createEntity( "Knot", "knot.mesh" );knotEnt->setMaterialName("Examples/TextureEffect2");Entity* cloneEnt;for(int n = 0; n < 3; n++ ){// Create a new node under the rootSceneNode* node = mSceneMgr->createSceneNode();// Random translateVector3 nodePos;nodePos.x = Math::SymmetricRandom() * 750.0;nodePos.y = Math::SymmetricRandom() * 100.0 + 25;nodePos.z = Math::SymmetricRandom() * 750.0;node->setPosition(nodePos);mSceneMgr->getRootSceneNode()->addChild(node);// Clone knotchar cloneName[12];sprintf(cloneName, "Knot%d", n);cloneEnt = knotEnt->clone(cloneName);//Attach to new nodenode->attachObject(cloneEnt);}// Create an ogreheadEntity* ogreHead = mSceneMgr->createEntity( "Head", "ogrehead.mesh" );mSceneMgr->getRootSceneNode()->createChildSceneNode( "Head" )->attachObject( ogreHead );
#if phase3mPlane = new MovablePlane("ReflectPlane");mPlane->d = 0;mPlane->normal = Vector3::UNIT_Y;MeshManager::getSingleton().createPlane("ReflectionPlane", ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,*mPlane, 4000, 4000,1, 1, true, 1, 1, 1, Vector3::UNIT_Z);mPlaneEnt = mSceneMgr->createEntity( "Plane", "ReflectionPlane");mPlaneNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();mPlaneNode->attachObject(mPlaneEnt);mPlaneNode->attachObject(mPlane);mPlaneNode->translate(0, -10, 0);//mPlaneNode->roll(Degree(5));
#if phase4TexturePtr texture = TextureManager::getSingleton().createManual( "RttTex",ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, TEX_TYPE_2D,512, 512, 0, PF_R8G8B8, TU_RENDERTARGET );RenderTarget *rttTex = texture->getBuffer()->getRenderTarget();mReflectCam = mSceneMgr->createCamera("ReflectCam");mReflectCam->setNearClipDistance(mCamera->getNearClipDistance());mReflectCam->setFarClipDistance(mCamera->getFarClipDistance());mReflectCam->setAspectRatio((Real)mWindow->getViewport(0)->getActualWidth() / (Real)mWindow->getViewport(0)->getActualHeight());Viewport *v = rttTex->addViewport( mReflectCam );v->setClearEveryFrame( true );v->setBackgroundColour( ColourValue::Black );MaterialPtr mat = MaterialManager::getSingleton().create("RttMat",ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);//TextureUnitState* t = mat->getTechnique(0)->getPass(0)->createTextureUnitState("RustedMetal.jpg");TextureUnitState* t = mat->getTechnique(0)->getPass(0)->createTextureUnitState("RttTex");// Blend with base texture
//      t->setColourOperationEx(LBX_BLEND_MANUAL, LBS_TEXTURE, LBS_CURRENT, ColourValue::White,
//          ColourValue::White, 0.25);t->setTextureAddressingMode(TextureUnitState::TAM_CLAMP);t->setProjectiveTexturing( true, mReflectCam );//rttTex->addListener(this);// set up linked reflectionmReflectCam->enableReflection(mPlane);// Also clipmReflectCam->enableCustomNearClipPlane(mPlane);mPlaneEnt->setMaterialName("RttMat");#endif
#endif#endif}
#if phase5void createFrameListener(){mFrameListener = new MyFrameListener( mWindow, mCamera, mReflectCam, mPlaneNode );mRoot->addFrameListener( mFrameListener );}
#endif
};
INT WINAPI WinMain( __in HINSTANCE hInstance, __in_opt HINSTANCE hPrevInstance, __in_opt LPSTR lpCmdLine, __in int nShowCmd )
{MyApplication app;try{app.go();}catch( Exception& e){MessageBoxA( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);}return 0;
}
#endif

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