/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

-----------------------------------------------------------------------------

*/

#include "OgreStableHeaders.h"

#include "OgreCompositionTargetPass.h"

namespace Ogre {

CompositionTechnique::CompositionTechnique(Compositor *parent):

    mParent(parent)

{

    mOutputTarget = OGRE_NEW CompositionTargetPass(this);

}

//-----------------------------------------------------------------------

CompositionTechnique::~CompositionTechnique()

{

    removeAllTextureDefinitions();

    removeAllTargetPasses();

    OGRE_DELETE  mOutputTarget;

}

//-----------------------------------------------------------------------

CompositionTechnique::TextureDefinition *CompositionTechnique::createTextureDefinition(const String &name)

{

    if(getTextureDefinition(name))

        OGRE_EXCEPT(Exception::ERR_DUPLICATE_ITEM, "Texture '"+name+"' already exists");

    TextureDefinition *t = OGRE_NEW TextureDefinition();

    t->name = name;

    mTextureDefinitions.push_back(t);

    return t;

}

//-----------------------------------------------------------------------

void CompositionTechnique::removeTextureDefinition(size_t index)

{

    assert (index < mTextureDefinitions.size() && "Index out of bounds.");

    TextureDefinitions::iterator i = mTextureDefinitions.begin() + index;

    OGRE_DELETE (*i);

    mTextureDefinitions.erase(i);

}

//---------------------------------------------------------------------

CompositionTechnique::TextureDefinition *CompositionTechnique::getTextureDefinition(const String& name) const

{

    for (auto *t : mTextureDefinitions)

    {

        if (t->name == name)

            return t;

    }

    return 0;

}

//-----------------------------------------------------------------------

void CompositionTechnique::removeAllTextureDefinitions()

{

    for (auto *t : mTextureDefinitions)

    {

        OGRE_DELETE t;

    }

    mTextureDefinitions.clear();

}

//-----------------------------------------------------------------------

CompositionTechnique::TextureDefinitionIterator CompositionTechnique::getTextureDefinitionIterator(void)

{

    return TextureDefinitionIterator(mTextureDefinitions.begin(), mTextureDefinitions.end());

}

//-----------------------------------------------------------------------

CompositionTargetPass *CompositionTechnique::createTargetPass()

{

    CompositionTargetPass *t = OGRE_NEW CompositionTargetPass(this);

    mTargetPasses.push_back(t);

    return t;

}

//-----------------------------------------------------------------------

void CompositionTechnique::removeTargetPass(size_t index)

{

    assert (index < mTargetPasses.size() && "Index out of bounds.");

    TargetPasses::iterator i = mTargetPasses.begin() + index;

    OGRE_DELETE (*i);

    mTargetPasses.erase(i);

}

//-----------------------------------------------------------------------

void CompositionTechnique::removeAllTargetPasses()

{

    for (auto *t : mTargetPasses)

    {

        OGRE_DELETE t;

    }

    mTargetPasses.clear();

}

//-----------------------------------------------------------------------

CompositionTechnique::TargetPassIterator CompositionTechnique::getTargetPassIterator(void)

{

    return TargetPassIterator(mTargetPasses.begin(), mTargetPasses.end());

}

//-----------------------------------------------------------------------

bool CompositionTechnique::isSupported(bool acceptTextureDegradation)

{

    // A technique is supported if all materials referenced have a supported

    // technique, and the intermediate texture formats requested are supported

    // Material support is a cast-iron requirement, but if no texture formats 

    // are directly supported we can let the rendersystem create the closest 

    // match for the least demanding technique

    // Check output target pass is supported

    if (!mOutputTarget->_isSupported())

    {

        return false;

    }

    // Check all target passes is supported

    for (auto *p : mTargetPasses)

    {

        if (!p->_isSupported())

        {

            return false;

        }

    }

    TextureManager& texMgr = TextureManager::getSingleton();

    for (auto *td : mTextureDefinitions)

    {

        // Firstly check MRTs

        if (td->formatList.size() > 

            Root::getSingleton().getRenderSystem()->getCapabilities()->getNumMultiRenderTargets())

        {

            return false;

        }

        for (auto& pfi : td->formatList)

        {

            // Check whether equivalent supported

            // Need a format which is the same number of bits to pass

            bool accepted = texMgr.isEquivalentFormatSupported(td->type, pfi, TU_RENDERTARGET);

            if(!accepted && acceptTextureDegradation)

            {

                // Don't care about exact format so long as something is supported

                accepted = texMgr.getNativeFormat(td->type, pfi, TU_RENDERTARGET) != PF_UNKNOWN;

            }

            if(!accepted)

                return false;

        }

        //Check all render targets have same number of bits

        if( Root::getSingleton().getRenderSystem()->getCapabilities()->

            hasCapability( RSC_MRT_SAME_BIT_DEPTHS ) && !td->formatList.empty() )

        {

            PixelFormat nativeFormat = texMgr.getNativeFormat( td->type, td->formatList.front(),

                                                                TU_RENDERTARGET );

            size_t nativeBits = PixelUtil::getNumElemBits( nativeFormat );

            for( PixelFormatList::iterator pfi = td->formatList.begin()+1;

                    pfi != td->formatList.end(); ++pfi )

            {

                PixelFormat nativeTmp = texMgr.getNativeFormat( td->type, *pfi, TU_RENDERTARGET );

                if( PixelUtil::getNumElemBits( nativeTmp ) != nativeBits )

                {

                    return false;

                }

            }

        }

    }

    // Must be ok

    return true;

}

//-----------------------------------------------------------------------

Compositor *CompositionTechnique::getParent()

{

    return mParent;

}

//---------------------------------------------------------------------

void CompositionTechnique::setSchemeName(const String& schemeName)

{

    mSchemeName = schemeName;

}

}