source: code/archive/tutorialHS08/src/orxonox/gui/OgreCEGUITexture.cpp @ 10255

/************************************************************************
    filename:   OgreCEGUITexture.cpp
    created:    11/5/2004
    author:             Paul D Turner
    
    purpose:    Implementation of Texture using Ogre engine
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library 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 2.1 of the License, or (at your option) any later version.

    This library 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 library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/

#include <CEGUISystem.h>
#include <CEGUIExceptions.h>
#include "OgreCEGUITexture.h"
#include "OgreCEGUIRenderer.h"

#include <OgreTextureManager.h>

// Start of CEGUI namespace section
namespace CEGUI
{
/*************************************************************************
    Static data definition / initialisation
*************************************************************************/
uint32 OgreCEGUITexture::d_texturenumber                = 0;


/*************************************************************************
    Constructor
*************************************************************************/
OgreCEGUITexture::OgreCEGUITexture(Renderer* owner) :
    Texture(owner)
{
    d_ogre_texture.setNull();
    d_isLinked = false;
}


/*************************************************************************
    Destructor
*************************************************************************/
OgreCEGUITexture::~OgreCEGUITexture(void)
{
    freeOgreTexture();
}


/*************************************************************************
    Loads the specified image file into the texture.  The texture is
    resized as required to hold the image.      
*************************************************************************/
void OgreCEGUITexture::loadFromFile(const String& filename, const String& resourceGroup)
{
    using namespace Ogre;

    // unload old ogre texture
    freeOgreTexture();

    // create / load a new ogre texture from the specified image
    try
    {
        TextureManager& textureManager = TextureManager::getSingleton();

        // see if texture already exists
        Ogre::TexturePtr ogreTexture = (Ogre::TexturePtr)textureManager.getByName(filename.c_str());

        if (!ogreTexture.isNull())
        {
            // texture already exists, so create a 'linked' texture (ensures texture is not destroyed twice)
            d_ogre_texture = ogreTexture;
            d_isLinked = true;
        }
        // texture does not already exist, so load it in
        else
        {
            String orpGroup;
            if (resourceGroup.empty())
            {
                const String& defGrp = CEGUI::System::getSingleton().getResourceProvider()->getDefaultResourceGroup();
                orpGroup = defGrp.empty() ? Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME.c_str() : defGrp;
            }
            else
            {
                orpGroup = resourceGroup;
            }

            d_ogre_texture = TextureManager::getSingleton().load(filename.c_str(), orpGroup.c_str(), TEX_TYPE_2D, 0, 1.0f);
            d_isLinked = false;
        }

    }
    catch(Ogre::Exception e)
    {
        throw RendererException((utf8*)"Failed to create Texture object from file '" + filename + "'. Additional Information:\n" + e.getFullDescription().c_str());
    }

    // if we got a pointer cache some details
    if (!d_ogre_texture.isNull())
    {
        d_width         = d_ogre_texture->getWidth();
        d_height        = d_ogre_texture->getHeight();
    }
    // no texture from image so throw.
    else
    {
        throw RendererException((utf8*)"Failed to create Texture object from file '" + filename + "'.  Ogre returned a NULL pointer.");
    }

}


/*************************************************************************
    Loads (copies) an image in memory into the texture.  The texture is
    resized as required to hold the image.      
*************************************************************************/

void _byteSwap(unsigned char* b, int n)
{
    register int i = 0;
    register int j = n-1;
    while (i<j)
    {
        std::swap(b[i], b[j]);
        i++, j--;
    }
}
#define byteSwap(x) _byteSwap((unsigned char*) &x,sizeof(x))

void OgreCEGUITexture::loadFromMemory(const void* buffPtr, uint buffWidth, uint buffHeight, PixelFormat pixelFormat)
{
    using namespace Ogre;

    // get rid of old texture
    freeOgreTexture();

    // wrap input buffer with an Ogre DataChunk
    uint32 bytesize = ((buffWidth * sizeof(uint32)) * buffHeight);

#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
    uint32* swappedBuffer = new uint32[bytesize/4];
    memcpy(swappedBuffer, buffPtr, bytesize);

    for (int i=0; i < bytesize/4; i++)
        byteSwap(swappedBuffer[i]);

    DataStreamPtr odc(new MemoryDataStream(static_cast<void*>(swappedBuffer), bytesize, false));
#else
    DataStreamPtr odc(new MemoryDataStream(const_cast<void*>(buffPtr), bytesize, false));
#endif

    // get pixel type for the target texture - the elements here might look wrong, but is just
    // differences in definition (at the core level, between GL and D3D).
    Ogre::PixelFormat targetFmt =
        (pixelFormat == PF_RGBA) ? Ogre::PF_A8R8G8B8 : Ogre::PF_R8G8B8;

    // try to create a Ogre::Texture from the input data
    d_ogre_texture = TextureManager::getSingleton().loadRawData(getUniqueName(), "General", odc, buffWidth, buffHeight, targetFmt , TEX_TYPE_2D, 0, 1.0f);

    // if we got a pointer cache some details
    if (!d_ogre_texture.isNull())
    {
        d_width         = d_ogre_texture->getWidth();
        d_height        = d_ogre_texture->getHeight();
    }
    // no texture from memory so throw.
    else
    {
        throw RendererException((utf8*)"Failed to create Texture object from memory:  Ogre returned a NULL Ogre::Texture pointer.");
    }

}


/*************************************************************************
    set the size of the internal Ogre texture.  Previous Ogre texture
    is lost.    
*************************************************************************/
void OgreCEGUITexture::setOgreTextureSize(uint size)
{
    using namespace Ogre;

    // unload any current Ogre::Texture
    freeOgreTexture();

    // Try to create an empty texture of the given size
    d_ogre_texture = TextureManager::getSingleton().createManual(getUniqueName(), "General", TEX_TYPE_2D, size, size, 0, PF_A8R8G8B8, TU_DEFAULT);

    // if we got a pointer cache some details
    if (!d_ogre_texture.isNull())
    {
        d_width         = d_ogre_texture->getWidth();
        d_height        = d_ogre_texture->getHeight();
    }
    // no texture so throw.
    else
    {
        throw RendererException((utf8*)"Failed to create texture of specified size: Ogre::Texture creation failed.");
    }

}


/*************************************************************************
    safely free Ogre::Texture texture (can be called multiple times with
    no ill effect)
*************************************************************************/
void OgreCEGUITexture::freeOgreTexture(void)
{
    if ((!d_ogre_texture.isNull()) && !d_isLinked)
    {
        Ogre::TextureManager::getSingleton().remove(d_ogre_texture->getHandle());
    }
    d_ogre_texture.setNull();
}


/*************************************************************************
    return a Ogre::string that contains a unique name.  
*************************************************************************/
Ogre::String OgreCEGUITexture::getUniqueName(void)
{
    Ogre::String str;

#ifdef CEGUI_USEOLDOGRESTRING
    str << "_cegui_ogre_" << d_texturenumber;
#else
    Ogre::StringUtil::StrStreamType strstream;
    strstream << "_cegui_ogre_" << d_texturenumber;
    str = strstream.str();
#endif

    ++d_texturenumber;

    return str;
}


/*************************************************************************
    Set the internal Ogre::Texture object.
*************************************************************************/
void OgreCEGUITexture::setOgreTexture(Ogre::TexturePtr& texture)
{
    freeOgreTexture();

    d_ogre_texture = texture;
    d_width      = d_ogre_texture->getWidth();
    d_height = d_ogre_texture->getHeight();
    d_isLinked = true;
}


} // End of  CEGUI namespace section