DecalsManager.cpp

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/*
--------------------------------------------------------------------------------
This source file is part of Hydrax.
Visit ---
 
Copyright (C) 2008 Xavier Verguín González <xavierverguin@hotmail.com>
                                           <xavyiy@gmail.com>
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
 
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/
 
#include <DecalsManager.h>
 
#include <Hydrax.h>
 
namespace Hydrax
{
    Decal::Decal(Hydrax *h, const Ogre::String &TextureName, const int& Id)
        : mHydrax(h)
        , mTextureName(TextureName)
        , mId(Id)
        , mRegisteredPass(0)
        , mPosition(Ogre::Vector2(0,0))
        , mSize(Ogre::Vector2(1,1))
        , mOrientation(Ogre::Radian(0))
        , mTransparency(1)
        , mVisible(true)
    {
        mProjector = new Ogre::Frustum();
        mProjector->setProjectionType(Ogre::PT_ORTHOGRAPHIC);
 
        mSceneNode = mHydrax->getSceneManager()->getRootSceneNode()->createChildSceneNode();
        mSceneNode->attachObject(mProjector);
        mSceneNode->setPosition(Ogre::Vector3(0,0,0));
        mSceneNode->setOrientation(Ogre::Quaternion(Ogre::Degree(90), Ogre::Vector3::NEGATIVE_UNIT_X));
 
        setPosition(mPosition);
        setSize(mSize);
        setOrientation(mOrientation);
    }
 
    Decal::~Decal()
    {
        unregister();
 
        mSceneNode->getParentSceneNode()->removeAndDestroyChild(mSceneNode);
 
        delete mProjector;
    }
 
    void Decal::registerPass(Ogre::Pass* _Pass)
    {
        unregister();
 
        _Pass->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);
        _Pass->setCullingMode(Ogre::CULL_NONE);
        _Pass->setDepthBias(1,1);
        _Pass->setLightingEnabled(false);
        _Pass->setDepthWriteEnabled(false);
 
        Ogre::TextureUnitState *DecalTexture = _Pass->createTextureUnitState(mTextureName);
        DecalTexture->setProjectiveTexturing(true, mProjector);
        DecalTexture->setTextureAddressingMode(Ogre::TextureUnitState::TAM_CLAMP);
        DecalTexture->setTextureFiltering(Ogre::FO_LINEAR, Ogre::FO_LINEAR, Ogre::FO_NONE);
        DecalTexture->setAlphaOperation(Ogre::LBX_MODULATE, Ogre::LBS_TEXTURE, Ogre::LBS_MANUAL, 1.0, mTransparency);
 
        mRegisteredPass = _Pass;
    }
 
    void Decal::unregister()
    {
        if (mRegisteredPass)
        {
            mRegisteredPass->getParent()->removePass(mRegisteredPass->getIndex());
            mRegisteredPass = static_cast<Ogre::Pass*>(NULL);
        }
    }
 
    void Decal::setPosition(const Ogre::Vector2& Position)
    {
        mPosition = Position;
 
        mSceneNode->setPosition(Position.x, 0, Position.y);
    }
 
    void Decal::setSize(const Ogre::Vector2& Size)
    {
        mSize = Size;
 
        // This method is only available in the CVS HEAD,
        // if you have problems compiling, just comment the
        // following line:
        mProjector->setOrthoWindow(Size.x, Size.y);
    }
 
    void Decal::setOrientation(const Ogre::Radian& Orientation)
    {
        mSceneNode->rotate(Ogre::Vector3::UNIT_Z, -mOrientation + Orientation);
 
        mOrientation = Orientation;
    }
 
    void Decal::setTransparency(const Ogre::Real& Transparency)
    {
        mTransparency = Transparency;
 
        if (mRegisteredPass)
        {
            mRegisteredPass->getTextureUnitState(0)
                ->setAlphaOperation(Ogre::LBX_MODULATE, Ogre::LBS_TEXTURE, Ogre::LBS_MANUAL, 1.0, mTransparency);
        }
    }
 
    void Decal::setVisible(const bool& Visible)
    {
        mVisible = Visible;
 
        unregister();
 
        mHydrax->getDecalsManager()->_forceToUpdate();
    }
 
    // --------------------------------------------------------------------
 
    DecalsManager::DecalsManager(Hydrax *h)
        : mHydrax(h)
        , mNextId(0)
        , mLastUnderwater(false)
        , mWaterStrength(5)
        , mForceToUpdate(false)
    {
    }
 
    DecalsManager::~DecalsManager()
    {
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            delete (*DecalIt);
        }
 
        mDecals.clear();
    }
 
    void DecalsManager::update()
    {
        if (mHydrax->getCamera()->getDerivedPosition()    == mLastPosition &&
            mHydrax->getCamera()->getDerivedOrientation() == mLastOrientation &&
            !mForceToUpdate)
        {
            return;
        }
 
        if (mForceToUpdate)
        {
            mForceToUpdate = false;
        }
 
        Ogre::Vector2 DPos;
        Ogre::Real    HHeight = mHydrax->getPosition().y;
        Ogre::Vector2 DSize;
        Ogre::AxisAlignedBox DecalBox;
 
        if (mLastUnderwater != mHydrax->_isCurrentFrameUnderwater())
        {
            for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
            {
                if (!(*DecalIt)->isVisible())
                {
                    continue;
                }
 
                if ((*DecalIt)->getRegisteredPass())
                {
                    (*DecalIt)->unregister();
 
                    if (!mHydrax->_isCurrentFrameUnderwater())
                    {
                        (*DecalIt)->registerPass(
                             mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_WATER)->
                                 getTechnique(0)->createPass());
                    }
                    else
                    {
                        (*DecalIt)->registerPass(
                             mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_UNDERWATER)->
                                 getTechnique(0)->createPass());
                    }
                }
 
            }
        }
 
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            if (!(*DecalIt)->isVisible())
            {
                continue;
            }
 
            DPos = (*DecalIt)->getPosition();
            DSize = (*DecalIt)->getSize()/2;
 
            DecalBox = Ogre::AxisAlignedBox(DPos.x - DSize.x,  HHeight - mWaterStrength, DPos.y - DSize.y,
                                            DPos.x + DSize.x,  HHeight + mWaterStrength, DPos.y + DSize.y);
 
            if (mHydrax->getCamera()->isVisible(DecalBox))
            {
                if (!(*DecalIt)->getRegisteredPass())
                {
                    if (!mHydrax->_isCurrentFrameUnderwater())
                    {
                        (*DecalIt)->registerPass(
                             mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_WATER)->
                                 getTechnique(0)->createPass());
                    }
                    else
                    {
                        (*DecalIt)->registerPass(
                             mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_UNDERWATER)->
                                 getTechnique(0)->createPass());
                    }
                }
            }
            else
            {
                (*DecalIt)->unregister();
            }
        }
 
        mLastPosition    = mHydrax->getCamera()->getDerivedPosition();
        mLastOrientation = mHydrax->getCamera()->getDerivedOrientation();
        mLastUnderwater  = mHydrax->_isCurrentFrameUnderwater();
    }
 
    Decal* DecalsManager::add(const Ogre::String& TextureName)
    {
        Decal* NewDecal = new Decal(mHydrax, TextureName, mNextId);
 
        mDecals.push_back(NewDecal);
 
        if (mHydrax->getMaterialManager()->isCreated())
        {
            NewDecal->registerPass(
                mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_WATER)->
                     getTechnique(0)->createPass());
        }
 
        mNextId++;
 
        return NewDecal;
    }
 
    Decal* DecalsManager::get(const int& Id)
    {
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            if((*DecalIt)->getId() == Id)
            {
                return (*DecalIt);
            }
        }
 
        return static_cast<Decal*>(NULL);
    }
 
    void DecalsManager::remove(const int& Id)
    {
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            if((*DecalIt)->getId() == Id)
            {
                delete (*DecalIt);
                mDecals.erase(DecalIt);
 
                return;
            }
        }
    }
 
    void DecalsManager::removeAll()
    {
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            delete (*DecalIt);
        }
 
        mDecals.clear();
 
        mNextId = 0;
    }
 
    void DecalsManager::registerAll()
    {
        for(DecalIt = mDecals.begin(); DecalIt != mDecals.end(); DecalIt++)
        {
            (*DecalIt)->unregister();
 
            if (!mHydrax->_isCurrentFrameUnderwater())
            {
                (*DecalIt)->registerPass(
                    mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_WATER)->
                       getTechnique(0)->createPass());
            }
            else
            {
                (*DecalIt)->registerPass(
                    mHydrax->getMaterialManager()->getMaterial(MaterialManager::MAT_UNDERWATER)->
                       getTechnique(0)->createPass());
            }
        }
    }
}