components/scene/MeshComponent.cpp

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// /////////////////////////////////////////////////////////////////////////////
//
// Name:            MeshComponent.cpp
// Author:          Michael Bartsch (ZCCdark203)
//
// Desc :           Component wrapper of Irrlicht's IMeshSceneNode.
//
// License:         Copyright (C) 2009 Michael Bartsch and Contributors
//
//                  This program is free software: you can redistribute it
//                  and/or modify it under the terms of the zlib/libpng License.
//                  See main.cpp for conditions of distribution and use.
//
// /////////////////////////////////////////////////////////////////////////////

// Include files
#include "MeshComponent.h"
#include "../../core/GameManager.h"


// MeshComponent class
// MeshComponent constructor (default).
MeshComponent::MeshComponent(Entity *parent)
: SceneComponent(parent, true)
{
    init();
}

// MeshComponent constructor.
MeshComponent::MeshComponent(Entity *parent, const std::string &fileName, const vector3df &scale)
: SceneComponent(parent, true)
{
    init(scale);
    setMesh(fileName);
}

// MeshComponent constructor.
MeshComponent::MeshComponent(Entity *parent, IMesh *mesh, const vector3df &scale)
: SceneComponent(parent, true)
{
    init(scale);
    setMesh(mesh);
}

// MeshComponent constructor (derivatives).
MeshComponent::MeshComponent(Entity *parent, bool isDerived)
: SceneComponent(parent, true)
{
}

// MeshComponent deconstructor.
MeshComponent::~MeshComponent()
{
    mMeshSN->remove();
    mSceneNode = NULL;
}

// Common initialisation method.
void MeshComponent::init(const vector3df &scale)
{
    // Get pointers to needed sub-systems of the Game Manager.
    ISceneManager *pSceneMgr = GameManager::Instance()->getSceneManager();

    // Create the internal scene node.
    mMeshSN = pSceneMgr->addMeshSceneNode(0, 0, pParent->getID(), pParent->getAbsolutePosition(),
                                          pParent->getAbsoluteRotation(), scale, true);
    mSceneNode = mMeshSN;

    // Set-up internal mechanism for collision detection.
    mTriSelector = pSceneMgr->createTriangleSelectorFromBoundingBox(mMeshSN);
    mMetaSelector = pSceneMgr->createMetaTriangleSelector();
}

// Returns a direct pointer to the IMeshSceneNode.
IMeshSceneNode* MeshComponent::getMeshSceneNode()
{
    return mMeshSN;
}

// Get the currently defined mesh for display.
IMesh* MeshComponent::getMesh()
{
    return mMeshSN->getMesh();
}

// Loads and sets a new mesh to display.
void MeshComponent::setMesh(const std::string &fileName)
{
    // Set up variables.
    AssetGroup *assets = pParent->getAssetGroup();
    IMesh *mesh = 0;

    // Retrieve pointer to the mesh.
    if(assets != NULL)
    {
        // Unsubscribe from previous asset.
        assets->disconnectEventSignal(std::string("meshes/") + mMeshFileName, this);

        // Get mesh.
        MeshProcessor *processor = static_cast<MeshProcessor*>(assets->getAssetProcessor("meshes"));
        mesh = processor->getMesh(fileName);

        if(mesh)
        {
           assets->connectEventSignal(std::string("meshes/") + fileName, this,
                                        &MeshComponent::onMesh);
           mMeshFileName = fileName;
        }
    }

    else
       mesh = GameManager::Instance()->getSceneManager()->getMesh(fileName.c_str());

    // Set mesh.
    mMeshSN->setMesh(mesh);
}

// Sets a new mesh to display.
void MeshComponent::setMesh(IMesh *mesh)
{
    // Check if we need to unsubscribe from an asset group mesh.
    AssetGroup *assets = pParent->getAssetGroup();

    if(assets != NULL)
    {
       assets->disconnectEventSignal(std::string("meshes/") + mMeshFileName, this);
       mMeshFileName = "";
    }

    // Set mesh.
    mMeshSN->setMesh(mesh);
}

// Responds to changes of the mesh attached to this component.
void MeshComponent::onMesh(void *p)
{
    // Get pointer to the new mesh.
    IMesh *mesh = reinterpret_cast<IMesh*>(p);

    // Set new mesh.
    mMeshSN->setMesh(mesh);
}

// Parses for a MeshComponent.
bool MeshComponent::parseXML(IXMLReader *file, Entity *entity)
{
    // Forward declaration.
    MeshComponent *component = NULL;

    // Are we dealing with a MeshComponent?
    if(file->getNodeType() == io::EXN_ELEMENT)
    {
       if(stringw("MeshComponent") == file->getNodeName())
       {
           // Initialise the component.
           component = new MeshComponent(entity);
       }
    }

    if(component == NULL)
      return false;

    // Continue parsing the file.
    while(file->read())
    {
        switch(file->getNodeType())
        {
           case io::EXN_ELEMENT:

              // Derived elements.
              if(!MeshComponent::parseBaseXML(file, component))
                SceneComponent::parseBaseXML(file, component);

              break;

           case io::EXN_ELEMENT_END:

              // </MeshComponent>
              if(stringw("MeshComponent") == file->getNodeName())
                return true;

              break;

         default:

            break;
        }

   }

   // The code should never get here.
   return false;
}

// Parses for the base elements of a MeshComponent.
bool MeshComponent::parseBaseXML(IXMLReader *file, MeshComponent *component)
{
    // <mesh>
    if(stringw("mesh") == file->getNodeName())
    {
       stringc fileName = file->getAttributeValue(L"fileName");
       component->setMesh(fileName.c_str());

       return true;
    }

    // We couldn't find any known elements.
    return false;
}

// End of File

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