source: OGRE/trunk/ogrenew/OgreMain/src/OgreTexture.cpp @ 657

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

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 "OgreStableHeaders.h"
#include "OgreLogManager.h"
#include "OgreHardwarePixelBuffer.h"
#include "OgreImage.h"
#include "OgreTexture.h"
#include "OgreException.h"
#include "OgreResourceManager.h"

namespace Ogre {
        //--------------------------------------------------------------------------
    Texture::Texture(ResourceManager* creator, const String& name, 
        ResourceHandle handle, const String& group, bool isManual, 
        ManualResourceLoader* loader)
        : Resource(creator, name, handle, group, isManual, loader),
            // init defaults; can be overridden before load()
            mHeight(512),
            mWidth(512),
            mDepth(1),
                        mNumRequestedMipmaps(0),
            mNumMipmaps(0),
                        mMipmapsHardwareGenerated(false),
            mGamma(1.0f),
            mTextureType(TEX_TYPE_2D),            
            mFormat(PF_A8R8G8B8),
            mUsage(TU_DEFAULT),
            // mSrcBpp inited later on
            mSrcWidth(0),
            mSrcHeight(0), 
            mSrcDepth(0), mInternalResourcesCreated(false)
            // mFinalBpp inited later on by enable32bit
            // mHasAlpha inited later on            
    {

        enable32Bit(false);

        if (createParamDictionary("Texture"))
        {
            // Define the parameters that have to be present to load
            // from a generic source; actually there are none, since when
            // predeclaring, you use a texture file which includes all the
            // information required.
        }

        
    }
        //--------------------------------------------------------------------------    //--------------------------------------------------------------------------
        void Texture::loadRawData( DataStreamPtr& stream, 
                ushort uWidth, ushort uHeight, PixelFormat eFormat)
        {
                Image img;
                img.loadRawData(stream, uWidth, uHeight, eFormat);
                loadImage(img);
        }
    //--------------------------------------------------------------------------
    void Texture::setFormat(PixelFormat pf)
    {
        mFormat = pf;
        // This should probably change with new texture access methods, but
        // no changes made for now
        mSrcBpp = PixelUtil::getNumElemBytes(mFormat);
        mHasAlpha = PixelUtil::getFlags(mFormat) & PFF_HASALPHA;
    }
    //--------------------------------------------------------------------------
        size_t Texture::calculateSize(void) const
        {
        return getNumFaces() * PixelUtil::getMemorySize(mWidth, mHeight, mDepth, mFormat);
        }
        //--------------------------------------------------------------------------
        size_t Texture::getNumFaces(void) const
        {
                return getTextureType() == TEX_TYPE_CUBE_MAP ? 6 : 1;
        }
        //--------------------------------------------------------------------------
    void Texture::_loadImages( const std::vector<const Image*>& images )
    {
                if(images.size() < 1)
                        OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Cannot load empty vector of images",
                         "Texture::loadImages");
        
        if( mIsLoaded )
        {
                        LogManager::getSingleton().logMessage( 
                                LML_NORMAL, "Texture: "+mName+": Unloading Image");
            unload();
        }

                // Set desired texture size and properties from images[0]
                mSrcWidth = mWidth = images[0]->getWidth();
                mSrcHeight = mHeight = images[0]->getHeight();
                mSrcDepth = mDepth = images[0]->getDepth();
                mFormat = images[0]->getFormat();
                mSrcBpp = PixelUtil::getNumElemBits(mFormat);
                mHasAlpha = PixelUtil::hasAlpha(mFormat);

                if (mFinalBpp == 16) 
                {
                        // Drop down texture internal format
                        switch (mFormat) 
                        {
                        case PF_R8G8B8:
                        case PF_X8R8G8B8:
                                mFormat = PF_R5G6B5;
                                break;
                        
                        case PF_B8G8R8:
                        case PF_X8B8G8R8:
                                mFormat = PF_B5G6R5;
                                break;
                                
                        case PF_A8R8G8B8:
                        case PF_R8G8B8A8:
                        case PF_A8B8G8R8:
                        case PF_B8G8R8A8:
                                mFormat = PF_A4R4G4B4;
                                break;
                        }
                }
                
                // The custom mipmaps in the image have priority over everything
        size_t imageMips = images[0]->getNumMipmaps();

                if(imageMips > 0) {
                        mNumMipmaps = images[0]->getNumMipmaps();
                        // Disable flag for auto mip generation
                        mUsage &= ~TU_AUTOMIPMAP;
                }
                
        // Create the texture
        createInternalResources();
                // Check if we're loading one image with multiple faces
                // or a vector of images representing the faces
                size_t faces;
                bool multiImage; // Load from multiple images?
                if(images.size() > 1)
                {
                        faces = images.size();
                        multiImage = true;
                }
                else
                {
                        faces = images[0]->getNumFaces();
                        multiImage = false;
                }
                
                // Check wether number of faces in images exceeds number of faces
                // in this texture. If so, clamp it.
                if(faces > getNumFaces())
                        faces = getNumFaces();
                
                // Say what we're doing
                StringUtil::StrStreamType str;
                str << "Texture: " << mName << ": Loading " << faces << " faces"
                        << "(" << PixelUtil::getFormatName(images[0]->getFormat()) << "," <<
                        images[0]->getWidth() << "x" << images[0]->getHeight() << "x" << images[0]->getDepth() <<
                        ") with ";
                if (!(mMipmapsHardwareGenerated && mNumMipmaps == 0))
                        str << mNumMipmaps;
                if(mUsage & TU_AUTOMIPMAP)
                {
                        if (mMipmapsHardwareGenerated)
                                str << " hardware";

                        str << " generated mipmaps";
                }
                else
                {
                        str << " custom mipmaps";
                }
                if(multiImage)
                        str << " from multiple Images.";
                else
                        str << " from Image.";
                // Scoped
                {
                        // Print data about first destination surface
                        HardwarePixelBufferSharedPtr buf = getBuffer(0, 0); 
                        str << " Internal format is " << PixelUtil::getFormatName(buf->getFormat()) << 
                        "," << buf->getWidth() << "x" << buf->getHeight() << "x" << buf->getDepth() << ".";
                }
                LogManager::getSingleton().logMessage( 
                                LML_NORMAL, str.str());
                
                // Main loading loop
        // imageMips == 0 if the image has no custom mipmaps, otherwise contains the number of custom mips
        for(size_t mip = 0; mip<=imageMips; ++mip)
        {
            for(size_t i = 0; i < faces; ++i)
            {
                PixelBox src;
                if(multiImage)
                {
                    // Load from multiple images
                    src = images[i]->getPixelBox(0, mip);
                }
                else
                {
                    // Load from faces of images[0]
                    src = images[0]->getPixelBox(i, mip);
                }
    
                if(mGamma != 1.0f) {
                    // Apply gamma correction
                    // Do not overwrite original image but do gamma correction in temporary buffer
                    MemoryDataStreamPtr buf; // for scoped deletion of conversion buffer
                    buf.bind(new MemoryDataStream(
                        PixelUtil::getMemorySize(
                            src.getWidth(), src.getHeight(), src.getDepth(), src.format)));
                    
                    PixelBox corrected = PixelBox(src.getWidth(), src.getHeight(), src.getDepth(), src.format, buf->getPtr());
                    PixelUtil::bulkPixelConversion(src, corrected);
                    
                    Image::applyGamma(static_cast<uint8*>(corrected.data), mGamma, corrected.getConsecutiveSize(), 
                        PixelUtil::getNumElemBits(src.format));
    
                    // Destination: entire texture. blitFromMemory does the scaling to
                    // a power of two for us when needed
                    getBuffer(i, mip)->blitFromMemory(corrected);
                }
                else 
                {
                    // Destination: entire texture. blitFromMemory does the scaling to
                    // a power of two for us when needed
                    getBuffer(i, mip)->blitFromMemory(src);
                }
                
            }
        }
        // Update size (the final size, not including temp space)
        mSize = getNumFaces() * PixelUtil::getMemorySize(mWidth, mHeight, mDepth, mFormat);

        mIsLoaded = true;
    }
        //-----------------------------------------------------------------------------
        void Texture::createInternalResources(void)
        {
                if (!mInternalResourcesCreated)
                {
                        createInternalResourcesImpl();
                        mInternalResourcesCreated = true;
                }
        }
        //-----------------------------------------------------------------------------
        void Texture::freeInternalResources(void)
        {
                if (mInternalResourcesCreated)
                {
                        freeInternalResourcesImpl();
                        mInternalResourcesCreated = false;
                }
        }
        //-----------------------------------------------------------------------------
        void Texture::unloadImpl(void)
        {
                freeInternalResources();
        }


}