This lab is based on a variety of sources, including the Ogre Shaders Wiki.

Discussion thread for this lab is here: Lab 6 Discussion Thread

The goal of this lab is to understand how you can upload and execute simple shader programs on the GPU. Those programs will be associated with Ogre materials that you can assign to objects in a scene.

No special preparation is required.

Follow these steps to complete the lab project:

1. Create a New Project Create a new empty project called “Lab6” in the same way you have created new projects for other lab projects. Create the Lab6Main.cpp file that contains a minimal Ogre application that displays at least one ground plane and an Ogre model. You can use your own application, or you can use the following code:

   #include "OGRE/Ogre.h";
   
   class MyApplication {
   private:
   	Ogre::SceneManager* _sceneManager;
   	Ogre::Root*			_root;
   	Ogre::Entity*		_ogre;
   	Ogre::Entity*		_ground;
   	Ogre::Camera*		_camera;
   
   public:
   
   	MyApplication() {
   		_sceneManager = NULL;
   		_root = NULL;
   		_ogre = NULL;
   		_ground = NULL;
   	}
   	
   	~MyApplication() {
   		delete _root;
   	}
   
   	void loadResources() {
   		Ogre::ConfigFile cf;
   		cf.load("resources_d.cfg");
   		Ogre::ConfigFile::SectionIterator sectionIter = cf.getSectionIterator();
   		Ogre::String sectionName, typeName, dataName;
   		while(sectionIter.hasMoreElements()) {
   			sectionName=sectionIter.peekNextKey();
   			Ogre::ConfigFile::SettingsMultiMap *settings =sectionIter.getNext();
   			Ogre::ConfigFile::SettingsMultiMap::iterator i;
   			for(i=settings->begin(); i!=settings->end(); ++i) {
   				typeName=i->first;
   				dataName=i->second;
   				Ogre::ResourceGroupManager::getSingleton().addResourceLocation(dataName, typeName, sectionName);	
   			}
   		}
   		Ogre::ResourceGroupManager::getSingleton().initialiseAllResourceGroups();
   	}
   		
   	void createScene() {
   		_ogre =_sceneManager->createEntity("Sinbad.mesh");
   		_sceneManager->getRootSceneNode()->createChildSceneNode()->attachObject(_ogre);
   
   		Ogre::Plane plane(Ogre::Vector3::UNIT_Y,-5);
   		Ogre::MeshManager::getSingleton().createPlane("plane",Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,plane,1500,1500,200,200,true,1,5,5,Ogre::Vector3::UNIT_Z);
   		Ogre::Entity* _ground=_sceneManager->createEntity("LightPlaneEntity","plane");
   		_sceneManager->getRootSceneNode()->createChildSceneNode()->attachObject(_ground);
   
   		_ogre->getSubEntity(0)->setCustomParameter(1, Ogre::Vector4(0.f, 0.f, 1.0f, 1.0f));
   		_ogre->setMaterialName("shader/custom");
   
   		_ground->setMaterialName("shader/texture");
   
   		Ogre::Light* light = _sceneManager->createLight("Light1");
   		light->setType(Ogre::Light::LT_POINT);
   		light->setPosition(Ogre::Vector3(-10.0, 10.0, 5.0));
   	}
   
   	int startup() {
   		_root=new Ogre::Root("Plugins_d.cfg");
   		if(!_root->showConfigDialog()) {
   			return -1;
   		}	
   
   		Ogre::RenderWindow* window=_root->initialise(true,"Ogre3D Lab6");
   		_sceneManager=_root->createSceneManager(Ogre::ST_GENERIC);
   
   		_camera=_sceneManager->createCamera("Camera");
   		_camera->setPosition(Ogre::Vector3(0,0,50));
   		_camera->lookAt(Ogre::Vector3(0,0,0));
   		_camera->setNearClipDistance(5);
   
   		Ogre::Viewport* viewport=window->addViewport(_camera);
   		viewport->setBackgroundColour(Ogre::ColourValue(0.0,0.0,0.5));
   		_camera->setAspectRatio(Ogre::Real(viewport->getActualWidth())/Ogre::Real(viewport->getActualHeight()));
   
   		loadResources();
   		createScene();
   
   		_root->startRendering();
   		return 0;
   
   	}
   };
   
   
   int main(void) {
   	MyApplication app;
   	app.startup();
   	return 0;
   }

2. Fixed Diffuse Color Fragment Shader
3. Parametric Diffuse Color Fragment Shader
4. Custom Diffuse Color Fragment Shader
5. Texture Vertex and Fragment Shaders
6. Animated Vertex Shader
7. Per Pixel Phong Shader

Upload your commented source files into Lab6 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade.